bump version, add non minified version

changelog.md

@@ -1,10 +1,10 @@
 # Change Log
 
-All notable changes to this project will be documented in this file.
+All notable changes will be documented in this file.
 
 <a name="1.1.0"></a>
 
-## 1.1.0 (vNEXT)
+## 1.1.0 (2019-09-16)
 
 - removed: deprecated `RtpDataChannels` and `DtlsSrtpKeyAgreement` options
 - removed: grunt from deps, upgrade deps versions

dist/peerjs.js

@@ -0,0 +1,10110 @@
+// modules are defined as an array
+// [ module function, map of requires ]
+//
+// map of requires is short require name -> numeric require
+//
+// anything defined in a previous bundle is accessed via the
+// orig method which is the require for previous bundles
+parcelRequire = (function (modules, cache, entry, globalName) {
+  // Save the require from previous bundle to this closure if any
+  var previousRequire = typeof parcelRequire === 'function' && parcelRequire;
+  var nodeRequire = typeof require === 'function' && require;
+
+  function newRequire(name, jumped) {
+    if (!cache[name]) {
+      if (!modules[name]) {
+        // if we cannot find the module within our internal map or
+        // cache jump to the current global require ie. the last bundle
+        // that was added to the page.
+        var currentRequire = typeof parcelRequire === 'function' && parcelRequire;
+        if (!jumped && currentRequire) {
+          return currentRequire(name, true);
+        }
+
+        // If there are other bundles on this page the require from the
+        // previous one is saved to 'previousRequire'. Repeat this as
+        // many times as there are bundles until the module is found or
+        // we exhaust the require chain.
+        if (previousRequire) {
+          return previousRequire(name, true);
+        }
+
+        // Try the node require function if it exists.
+        if (nodeRequire && typeof name === 'string') {
+          return nodeRequire(name);
+        }
+
+        var err = new Error('Cannot find module \'' + name + '\'');
+        err.code = 'MODULE_NOT_FOUND';
+        throw err;
+      }
+
+      localRequire.resolve = resolve;
+      localRequire.cache = {};
+
+      var module = cache[name] = new newRequire.Module(name);
+
+      modules[name][0].call(module.exports, localRequire, module, module.exports, this);
+    }
+
+    return cache[name].exports;
+
+    function localRequire(x){
+      return newRequire(localRequire.resolve(x));
+    }
+
+    function resolve(x){
+      return modules[name][1][x] || x;
+    }
+  }
+
+  function Module(moduleName) {
+    this.id = moduleName;
+    this.bundle = newRequire;
+    this.exports = {};
+  }
+
+  newRequire.isParcelRequire = true;
+  newRequire.Module = Module;
+  newRequire.modules = modules;
+  newRequire.cache = cache;
+  newRequire.parent = previousRequire;
+  newRequire.register = function (id, exports) {
+    modules[id] = [function (require, module) {
+      module.exports = exports;
+    }, {}];
+  };
+
+  var error;
+  for (var i = 0; i < entry.length; i++) {
+    try {
+      newRequire(entry[i]);
+    } catch (e) {
+      // Save first error but execute all entries
+      if (!error) {
+        error = e;
+      }
+    }
+  }
+
+  if (entry.length) {
+    // Expose entry point to Node, AMD or browser globals
+    // Based on https://github.com/ForbesLindesay/umd/blob/master/template.js
+    var mainExports = newRequire(entry[entry.length - 1]);
+
+    // CommonJS
+    if (typeof exports === "object" && typeof module !== "undefined") {
+      module.exports = mainExports;
+
+    // RequireJS
+    } else if (typeof define === "function" && define.amd) {
+     define(function () {
+       return mainExports;
+     });
+
+    // <script>
+    } else if (globalName) {
+      this[globalName] = mainExports;
+    }
+  }
+
+  // Override the current require with this new one
+  parcelRequire = newRequire;
+
+  if (error) {
+    // throw error from earlier, _after updating parcelRequire_
+    throw error;
+  }
+
+  return newRequire;
+})({"4EgB":[function(require,module,exports) {
+var binaryFeatures = {};
+binaryFeatures.useBlobBuilder = (function () {
+  try {
+    new Blob([]);
+    return false;
+  } catch (e) {
+    return true;
+  }
+})();
+
+binaryFeatures.useArrayBufferView = !binaryFeatures.useBlobBuilder && (function () {
+  try {
+    return (new Blob([new Uint8Array([])])).size === 0;
+  } catch (e) {
+    return true;
+  }
+})();
+
+module.exports.binaryFeatures = binaryFeatures;
+var BlobBuilder = module.exports.BlobBuilder;
+if (typeof window !== 'undefined') {
+  BlobBuilder = module.exports.BlobBuilder = window.WebKitBlobBuilder ||
+    window.MozBlobBuilder || window.MSBlobBuilder || window.BlobBuilder;
+}
+
+function BufferBuilder () {
+  this._pieces = [];
+  this._parts = [];
+}
+
+BufferBuilder.prototype.append = function (data) {
+  if (typeof data === 'number') {
+    this._pieces.push(data);
+  } else {
+    this.flush();
+    this._parts.push(data);
+  }
+};
+
+BufferBuilder.prototype.flush = function () {
+  if (this._pieces.length > 0) {
+    var buf = new Uint8Array(this._pieces);
+    if (!binaryFeatures.useArrayBufferView) {
+      buf = buf.buffer;
+    }
+    this._parts.push(buf);
+    this._pieces = [];
+  }
+};
+
+BufferBuilder.prototype.getBuffer = function () {
+  this.flush();
+  if (binaryFeatures.useBlobBuilder) {
+    var builder = new BlobBuilder();
+    for (var i = 0, ii = this._parts.length; i < ii; i++) {
+      builder.append(this._parts[i]);
+    }
+    return builder.getBlob();
+  } else {
+    return new Blob(this._parts);
+  }
+};
+
+module.exports.BufferBuilder = BufferBuilder;
+
+},{}],"kdPp":[function(require,module,exports) {
+var BufferBuilder = require('./bufferbuilder').BufferBuilder;
+var binaryFeatures = require('./bufferbuilder').binaryFeatures;
+
+var BinaryPack = {
+  unpack: function (data) {
+    var unpacker = new Unpacker(data);
+    return unpacker.unpack();
+  },
+  pack: function (data) {
+    var packer = new Packer();
+    packer.pack(data);
+    var buffer = packer.getBuffer();
+    return buffer;
+  }
+};
+
+module.exports = BinaryPack;
+
+function Unpacker (data) {
+  // Data is ArrayBuffer
+  this.index = 0;
+  this.dataBuffer = data;
+  this.dataView = new Uint8Array(this.dataBuffer);
+  this.length = this.dataBuffer.byteLength;
+}
+
+Unpacker.prototype.unpack = function () {
+  var type = this.unpack_uint8();
+  if (type < 0x80) {
+    return type;
+  } else if ((type ^ 0xe0) < 0x20) {
+    return (type ^ 0xe0) - 0x20;
+  }
+
+  var size;
+  if ((size = type ^ 0xa0) <= 0x0f) {
+    return this.unpack_raw(size);
+  } else if ((size = type ^ 0xb0) <= 0x0f) {
+    return this.unpack_string(size);
+  } else if ((size = type ^ 0x90) <= 0x0f) {
+    return this.unpack_array(size);
+  } else if ((size = type ^ 0x80) <= 0x0f) {
+    return this.unpack_map(size);
+  }
+
+  switch (type) {
+    case 0xc0:
+      return null;
+    case 0xc1:
+      return undefined;
+    case 0xc2:
+      return false;
+    case 0xc3:
+      return true;
+    case 0xca:
+      return this.unpack_float();
+    case 0xcb:
+      return this.unpack_double();
+    case 0xcc:
+      return this.unpack_uint8();
+    case 0xcd:
+      return this.unpack_uint16();
+    case 0xce:
+      return this.unpack_uint32();
+    case 0xcf:
+      return this.unpack_uint64();
+    case 0xd0:
+      return this.unpack_int8();
+    case 0xd1:
+      return this.unpack_int16();
+    case 0xd2:
+      return this.unpack_int32();
+    case 0xd3:
+      return this.unpack_int64();
+    case 0xd4:
+      return undefined;
+    case 0xd5:
+      return undefined;
+    case 0xd6:
+      return undefined;
+    case 0xd7:
+      return undefined;
+    case 0xd8:
+      size = this.unpack_uint16();
+      return this.unpack_string(size);
+    case 0xd9:
+      size = this.unpack_uint32();
+      return this.unpack_string(size);
+    case 0xda:
+      size = this.unpack_uint16();
+      return this.unpack_raw(size);
+    case 0xdb:
+      size = this.unpack_uint32();
+      return this.unpack_raw(size);
+    case 0xdc:
+      size = this.unpack_uint16();
+      return this.unpack_array(size);
+    case 0xdd:
+      size = this.unpack_uint32();
+      return this.unpack_array(size);
+    case 0xde:
+      size = this.unpack_uint16();
+      return this.unpack_map(size);
+    case 0xdf:
+      size = this.unpack_uint32();
+      return this.unpack_map(size);
+  }
+};
+
+Unpacker.prototype.unpack_uint8 = function () {
+  var byte = this.dataView[this.index] & 0xff;
+  this.index++;
+  return byte;
+};
+
+Unpacker.prototype.unpack_uint16 = function () {
+  var bytes = this.read(2);
+  var uint16 =
+    ((bytes[0] & 0xff) * 256) + (bytes[1] & 0xff);
+  this.index += 2;
+  return uint16;
+};
+
+Unpacker.prototype.unpack_uint32 = function () {
+  var bytes = this.read(4);
+  var uint32 =
+    ((bytes[0] * 256 +
+      bytes[1]) * 256 +
+      bytes[2]) * 256 +
+    bytes[3];
+  this.index += 4;
+  return uint32;
+};
+
+Unpacker.prototype.unpack_uint64 = function () {
+  var bytes = this.read(8);
+  var uint64 =
+    ((((((bytes[0] * 256 +
+      bytes[1]) * 256 +
+      bytes[2]) * 256 +
+      bytes[3]) * 256 +
+      bytes[4]) * 256 +
+      bytes[5]) * 256 +
+      bytes[6]) * 256 +
+    bytes[7];
+  this.index += 8;
+  return uint64;
+};
+
+Unpacker.prototype.unpack_int8 = function () {
+  var uint8 = this.unpack_uint8();
+  return (uint8 < 0x80) ? uint8 : uint8 - (1 << 8);
+};
+
+Unpacker.prototype.unpack_int16 = function () {
+  var uint16 = this.unpack_uint16();
+  return (uint16 < 0x8000) ? uint16 : uint16 - (1 << 16);
+};
+
+Unpacker.prototype.unpack_int32 = function () {
+  var uint32 = this.unpack_uint32();
+  return (uint32 < Math.pow(2, 31)) ? uint32
+    : uint32 - Math.pow(2, 32);
+};
+
+Unpacker.prototype.unpack_int64 = function () {
+  var uint64 = this.unpack_uint64();
+  return (uint64 < Math.pow(2, 63)) ? uint64
+    : uint64 - Math.pow(2, 64);
+};
+
+Unpacker.prototype.unpack_raw = function (size) {
+  if (this.length < this.index + size) {
+    throw new Error('BinaryPackFailure: index is out of range' +
+      ' ' + this.index + ' ' + size + ' ' + this.length);
+  }
+  var buf = this.dataBuffer.slice(this.index, this.index + size);
+  this.index += size;
+
+  // buf = util.bufferToString(buf);
+
+  return buf;
+};
+
+Unpacker.prototype.unpack_string = function (size) {
+  var bytes = this.read(size);
+  var i = 0;
+  var str = '';
+  var c;
+  var code;
+
+  while (i < size) {
+    c = bytes[i];
+    if (c < 128) {
+      str += String.fromCharCode(c);
+      i++;
+    } else if ((c ^ 0xc0) < 32) {
+      code = ((c ^ 0xc0) << 6) | (bytes[i + 1] & 63);
+      str += String.fromCharCode(code);
+      i += 2;
+    } else {
+      code = ((c & 15) << 12) | ((bytes[i + 1] & 63) << 6) |
+        (bytes[i + 2] & 63);
+      str += String.fromCharCode(code);
+      i += 3;
+    }
+  }
+
+  this.index += size;
+  return str;
+};
+
+Unpacker.prototype.unpack_array = function (size) {
+  var objects = new Array(size);
+  for (var i = 0; i < size; i++) {
+    objects[i] = this.unpack();
+  }
+  return objects;
+};
+
+Unpacker.prototype.unpack_map = function (size) {
+  var map = {};
+  for (var i = 0; i < size; i++) {
+    var key = this.unpack();
+    var value = this.unpack();
+    map[key] = value;
+  }
+  return map;
+};
+
+Unpacker.prototype.unpack_float = function () {
+  var uint32 = this.unpack_uint32();
+  var sign = uint32 >> 31;
+  var exp = ((uint32 >> 23) & 0xff) - 127;
+  var fraction = (uint32 & 0x7fffff) | 0x800000;
+  return (sign === 0 ? 1 : -1) *
+    fraction * Math.pow(2, exp - 23);
+};
+
+Unpacker.prototype.unpack_double = function () {
+  var h32 = this.unpack_uint32();
+  var l32 = this.unpack_uint32();
+  var sign = h32 >> 31;
+  var exp = ((h32 >> 20) & 0x7ff) - 1023;
+  var hfrac = (h32 & 0xfffff) | 0x100000;
+  var frac = hfrac * Math.pow(2, exp - 20) +
+    l32 * Math.pow(2, exp - 52);
+  return (sign === 0 ? 1 : -1) * frac;
+};
+
+Unpacker.prototype.read = function (length) {
+  var j = this.index;
+  if (j + length <= this.length) {
+    return this.dataView.subarray(j, j + length);
+  } else {
+    throw new Error('BinaryPackFailure: read index out of range');
+  }
+};
+
+function Packer () {
+  this.bufferBuilder = new BufferBuilder();
+}
+
+Packer.prototype.getBuffer = function () {
+  return this.bufferBuilder.getBuffer();
+};
+
+Packer.prototype.pack = function (value) {
+  var type = typeof (value);
+  if (type === 'string') {
+    this.pack_string(value);
+  } else if (type === 'number') {
+    if (Math.floor(value) === value) {
+      this.pack_integer(value);
+    } else {
+      this.pack_double(value);
+    }
+  } else if (type === 'boolean') {
+    if (value === true) {
+      this.bufferBuilder.append(0xc3);
+    } else if (value === false) {
+      this.bufferBuilder.append(0xc2);
+    }
+  } else if (type === 'undefined') {
+    this.bufferBuilder.append(0xc0);
+  } else if (type === 'object') {
+    if (value === null) {
+      this.bufferBuilder.append(0xc0);
+    } else {
+      var constructor = value.constructor;
+      if (constructor == Array) {
+        this.pack_array(value);
+      } else if (constructor == Blob || constructor == File || value instanceof Blob || value instanceof File) {
+        this.pack_bin(value);
+      } else if (constructor == ArrayBuffer) {
+        if (binaryFeatures.useArrayBufferView) {
+          this.pack_bin(new Uint8Array(value));
+        } else {
+          this.pack_bin(value);
+        }
+      } else if ('BYTES_PER_ELEMENT' in value) {
+        if (binaryFeatures.useArrayBufferView) {
+          this.pack_bin(new Uint8Array(value.buffer));
+        } else {
+          this.pack_bin(value.buffer);
+        }
+      } else if ((constructor == Object) || (constructor.toString().startsWith('class'))) {
+        this.pack_object(value);
+      } else if (constructor == Date) {
+        this.pack_string(value.toString());
+      } else if (typeof value.toBinaryPack === 'function') {
+        this.bufferBuilder.append(value.toBinaryPack());
+      } else {
+        throw new Error('Type "' + constructor.toString() + '" not yet supported');
+      }
+    }
+  } else {
+    throw new Error('Type "' + type + '" not yet supported');
+  }
+  this.bufferBuilder.flush();
+};
+
+Packer.prototype.pack_bin = function (blob) {
+  var length = blob.length || blob.byteLength || blob.size;
+  if (length <= 0x0f) {
+    this.pack_uint8(0xa0 + length);
+  } else if (length <= 0xffff) {
+    this.bufferBuilder.append(0xda);
+    this.pack_uint16(length);
+  } else if (length <= 0xffffffff) {
+    this.bufferBuilder.append(0xdb);
+    this.pack_uint32(length);
+  } else {
+    throw new Error('Invalid length');
+  }
+  this.bufferBuilder.append(blob);
+};
+
+Packer.prototype.pack_string = function (str) {
+  var length = utf8Length(str);
+
+  if (length <= 0x0f) {
+    this.pack_uint8(0xb0 + length);
+  } else if (length <= 0xffff) {
+    this.bufferBuilder.append(0xd8);
+    this.pack_uint16(length);
+  } else if (length <= 0xffffffff) {
+    this.bufferBuilder.append(0xd9);
+    this.pack_uint32(length);
+  } else {
+    throw new Error('Invalid length');
+  }
+  this.bufferBuilder.append(str);
+};
+
+Packer.prototype.pack_array = function (ary) {
+  var length = ary.length;
+  if (length <= 0x0f) {
+    this.pack_uint8(0x90 + length);
+  } else if (length <= 0xffff) {
+    this.bufferBuilder.append(0xdc);
+    this.pack_uint16(length);
+  } else if (length <= 0xffffffff) {
+    this.bufferBuilder.append(0xdd);
+    this.pack_uint32(length);
+  } else {
+    throw new Error('Invalid length');
+  }
+  for (var i = 0; i < length; i++) {
+    this.pack(ary[i]);
+  }
+};
+
+Packer.prototype.pack_integer = function (num) {
+  if (num >= -0x20 && num <= 0x7f) {
+    this.bufferBuilder.append(num & 0xff);
+  } else if (num >= 0x00 && num <= 0xff) {
+    this.bufferBuilder.append(0xcc);
+    this.pack_uint8(num);
+  } else if (num >= -0x80 && num <= 0x7f) {
+    this.bufferBuilder.append(0xd0);
+    this.pack_int8(num);
+  } else if (num >= 0x0000 && num <= 0xffff) {
+    this.bufferBuilder.append(0xcd);
+    this.pack_uint16(num);
+  } else if (num >= -0x8000 && num <= 0x7fff) {
+    this.bufferBuilder.append(0xd1);
+    this.pack_int16(num);
+  } else if (num >= 0x00000000 && num <= 0xffffffff) {
+    this.bufferBuilder.append(0xce);
+    this.pack_uint32(num);
+  } else if (num >= -0x80000000 && num <= 0x7fffffff) {
+    this.bufferBuilder.append(0xd2);
+    this.pack_int32(num);
+  } else if (num >= -0x8000000000000000 && num <= 0x7FFFFFFFFFFFFFFF) {
+    this.bufferBuilder.append(0xd3);
+    this.pack_int64(num);
+  } else if (num >= 0x0000000000000000 && num <= 0xFFFFFFFFFFFFFFFF) {
+    this.bufferBuilder.append(0xcf);
+    this.pack_uint64(num);
+  } else {
+    throw new Error('Invalid integer');
+  }
+};
+
+Packer.prototype.pack_double = function (num) {
+  var sign = 0;
+  if (num < 0) {
+    sign = 1;
+    num = -num;
+  }
+  var exp = Math.floor(Math.log(num) / Math.LN2);
+  var frac0 = num / Math.pow(2, exp) - 1;
+  var frac1 = Math.floor(frac0 * Math.pow(2, 52));
+  var b32 = Math.pow(2, 32);
+  var h32 = (sign << 31) | ((exp + 1023) << 20) |
+    (frac1 / b32) & 0x0fffff;
+  var l32 = frac1 % b32;
+  this.bufferBuilder.append(0xcb);
+  this.pack_int32(h32);
+  this.pack_int32(l32);
+};
+
+Packer.prototype.pack_object = function (obj) {
+  var keys = Object.keys(obj);
+  var length = keys.length;
+  if (length <= 0x0f) {
+    this.pack_uint8(0x80 + length);
+  } else if (length <= 0xffff) {
+    this.bufferBuilder.append(0xde);
+    this.pack_uint16(length);
+  } else if (length <= 0xffffffff) {
+    this.bufferBuilder.append(0xdf);
+    this.pack_uint32(length);
+  } else {
+    throw new Error('Invalid length');
+  }
+  for (var prop in obj) {
+    if (obj.hasOwnProperty(prop)) {
+      this.pack(prop);
+      this.pack(obj[prop]);
+    }
+  }
+};
+
+Packer.prototype.pack_uint8 = function (num) {
+  this.bufferBuilder.append(num);
+};
+
+Packer.prototype.pack_uint16 = function (num) {
+  this.bufferBuilder.append(num >> 8);
+  this.bufferBuilder.append(num & 0xff);
+};
+
+Packer.prototype.pack_uint32 = function (num) {
+  var n = num & 0xffffffff;
+  this.bufferBuilder.append((n & 0xff000000) >>> 24);
+  this.bufferBuilder.append((n & 0x00ff0000) >>> 16);
+  this.bufferBuilder.append((n & 0x0000ff00) >>> 8);
+  this.bufferBuilder.append((n & 0x000000ff));
+};
+
+Packer.prototype.pack_uint64 = function (num) {
+  var high = num / Math.pow(2, 32);
+  var low = num % Math.pow(2, 32);
+  this.bufferBuilder.append((high & 0xff000000) >>> 24);
+  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);
+  this.bufferBuilder.append((high & 0x0000ff00) >>> 8);
+  this.bufferBuilder.append((high & 0x000000ff));
+  this.bufferBuilder.append((low & 0xff000000) >>> 24);
+  this.bufferBuilder.append((low & 0x00ff0000) >>> 16);
+  this.bufferBuilder.append((low & 0x0000ff00) >>> 8);
+  this.bufferBuilder.append((low & 0x000000ff));
+};
+
+Packer.prototype.pack_int8 = function (num) {
+  this.bufferBuilder.append(num & 0xff);
+};
+
+Packer.prototype.pack_int16 = function (num) {
+  this.bufferBuilder.append((num & 0xff00) >> 8);
+  this.bufferBuilder.append(num & 0xff);
+};
+
+Packer.prototype.pack_int32 = function (num) {
+  this.bufferBuilder.append((num >>> 24) & 0xff);
+  this.bufferBuilder.append((num & 0x00ff0000) >>> 16);
+  this.bufferBuilder.append((num & 0x0000ff00) >>> 8);
+  this.bufferBuilder.append((num & 0x000000ff));
+};
+
+Packer.prototype.pack_int64 = function (num) {
+  var high = Math.floor(num / Math.pow(2, 32));
+  var low = num % Math.pow(2, 32);
+  this.bufferBuilder.append((high & 0xff000000) >>> 24);
+  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);
+  this.bufferBuilder.append((high & 0x0000ff00) >>> 8);
+  this.bufferBuilder.append((high & 0x000000ff));
+  this.bufferBuilder.append((low & 0xff000000) >>> 24);
+  this.bufferBuilder.append((low & 0x00ff0000) >>> 16);
+  this.bufferBuilder.append((low & 0x0000ff00) >>> 8);
+  this.bufferBuilder.append((low & 0x000000ff));
+};
+
+function _utf8Replace (m) {
+  var code = m.charCodeAt(0);
+
+  if (code <= 0x7ff) return '00';
+  if (code <= 0xffff) return '000';
+  if (code <= 0x1fffff) return '0000';
+  if (code <= 0x3ffffff) return '00000';
+  return '000000';
+}
+
+function utf8Length (str) {
+  if (str.length > 600) {
+    // Blob method faster for large strings
+    return (new Blob([str])).size;
+  } else {
+    return str.replace(/[^\u0000-\u007F]/g, _utf8Replace).length;
+  }
+}
+
+},{"./bufferbuilder":"4EgB"}],"iSxC":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.extractVersion = extractVersion;
+exports.wrapPeerConnectionEvent = wrapPeerConnectionEvent;
+exports.disableLog = disableLog;
+exports.disableWarnings = disableWarnings;
+exports.log = log;
+exports.deprecated = deprecated;
+exports.detectBrowser = detectBrowser;
+exports.compactObject = compactObject;
+exports.walkStats = walkStats;
+exports.filterStats = filterStats;
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+var logDisabled_ = true;
+var deprecationWarnings_ = true;
+/**
+ * Extract browser version out of the provided user agent string.
+ *
+ * @param {!string} uastring userAgent string.
+ * @param {!string} expr Regular expression used as match criteria.
+ * @param {!number} pos position in the version string to be returned.
+ * @return {!number} browser version.
+ */
+
+function extractVersion(uastring, expr, pos) {
+  var match = uastring.match(expr);
+  return match && match.length >= pos && parseInt(match[pos], 10);
+} // Wraps the peerconnection event eventNameToWrap in a function
+// which returns the modified event object (or false to prevent
+// the event).
+
+
+function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+
+  var proto = window.RTCPeerConnection.prototype;
+  var nativeAddEventListener = proto.addEventListener;
+
+  proto.addEventListener = function (nativeEventName, cb) {
+    if (nativeEventName !== eventNameToWrap) {
+      return nativeAddEventListener.apply(this, arguments);
+    }
+
+    var wrappedCallback = function (e) {
+      var modifiedEvent = wrapper(e);
+
+      if (modifiedEvent) {
+        cb(modifiedEvent);
+      }
+    };
+
+    this._eventMap = this._eventMap || {};
+    this._eventMap[cb] = wrappedCallback;
+    return nativeAddEventListener.apply(this, [nativeEventName, wrappedCallback]);
+  };
+
+  var nativeRemoveEventListener = proto.removeEventListener;
+
+  proto.removeEventListener = function (nativeEventName, cb) {
+    if (nativeEventName !== eventNameToWrap || !this._eventMap || !this._eventMap[cb]) {
+      return nativeRemoveEventListener.apply(this, arguments);
+    }
+
+    var unwrappedCb = this._eventMap[cb];
+    delete this._eventMap[cb];
+    return nativeRemoveEventListener.apply(this, [nativeEventName, unwrappedCb]);
+  };
+
+  Object.defineProperty(proto, 'on' + eventNameToWrap, {
+    get: function () {
+      return this['_on' + eventNameToWrap];
+    },
+    set: function (cb) {
+      if (this['_on' + eventNameToWrap]) {
+        this.removeEventListener(eventNameToWrap, this['_on' + eventNameToWrap]);
+        delete this['_on' + eventNameToWrap];
+      }
+
+      if (cb) {
+        this.addEventListener(eventNameToWrap, this['_on' + eventNameToWrap] = cb);
+      }
+    },
+    enumerable: true,
+    configurable: true
+  });
+}
+
+function disableLog(bool) {
+  if (typeof bool !== 'boolean') {
+    return new Error('Argument type: ' + _typeof(bool) + '. Please use a boolean.');
+  }
+
+  logDisabled_ = bool;
+  return bool ? 'adapter.js logging disabled' : 'adapter.js logging enabled';
+}
+/**
+ * Disable or enable deprecation warnings
+ * @param {!boolean} bool set to true to disable warnings.
+ */
+
+
+function disableWarnings(bool) {
+  if (typeof bool !== 'boolean') {
+    return new Error('Argument type: ' + _typeof(bool) + '. Please use a boolean.');
+  }
+
+  deprecationWarnings_ = !bool;
+  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');
+}
+
+function log() {
+  if ((typeof window === "undefined" ? "undefined" : _typeof(window)) === 'object') {
+    if (logDisabled_) {
+      return;
+    }
+
+    if (typeof console !== 'undefined' && typeof console.log === 'function') {
+      console.log.apply(console, arguments);
+    }
+  }
+}
+/**
+ * Shows a deprecation warning suggesting the modern and spec-compatible API.
+ */
+
+
+function deprecated(oldMethod, newMethod) {
+  if (!deprecationWarnings_) {
+    return;
+  }
+
+  console.warn(oldMethod + ' is deprecated, please use ' + newMethod + ' instead.');
+}
+/**
+ * Browser detector.
+ *
+ * @return {object} result containing browser and version
+ *     properties.
+ */
+
+
+function detectBrowser(window) {
+  var {
+    navigator: navigator
+  } = window; // Returned result object.
+
+  var result = {
+    browser: null,
+    version: null
+  }; // Fail early if it's not a browser
+
+  if (typeof window === 'undefined' || !window.navigator) {
+    result.browser = 'Not a browser.';
+    return result;
+  }
+
+  if (navigator.mozGetUserMedia) {
+    // Firefox.
+    result.browser = 'firefox';
+    result.version = extractVersion(navigator.userAgent, /Firefox\/(\d+)\./, 1);
+  } else if (navigator.webkitGetUserMedia || window.isSecureContext === false && window.webkitRTCPeerConnection && !window.RTCIceGatherer) {
+    // Chrome, Chromium, Webview, Opera.
+    // Version matches Chrome/WebRTC version.
+    // Chrome 74 removed webkitGetUserMedia on http as well so we need the
+    // more complicated fallback to webkitRTCPeerConnection.
+    result.browser = 'chrome';
+    result.version = extractVersion(navigator.userAgent, /Chrom(e|ium)\/(\d+)\./, 2);
+  } else if (navigator.mediaDevices && navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)) {
+    // Edge.
+    result.browser = 'edge';
+    result.version = extractVersion(navigator.userAgent, /Edge\/(\d+).(\d+)$/, 2);
+  } else if (window.RTCPeerConnection && navigator.userAgent.match(/AppleWebKit\/(\d+)\./)) {
+    // Safari.
+    result.browser = 'safari';
+    result.version = extractVersion(navigator.userAgent, /AppleWebKit\/(\d+)\./, 1);
+    result.supportsUnifiedPlan = window.RTCRtpTransceiver && 'currentDirection' in window.RTCRtpTransceiver.prototype;
+  } else {
+    // Default fallthrough: not supported.
+    result.browser = 'Not a supported browser.';
+    return result;
+  }
+
+  return result;
+}
+/**
+ * Checks if something is an object.
+ *
+ * @param {*} val The something you want to check.
+ * @return true if val is an object, false otherwise.
+ */
+
+
+function isObject(val) {
+  return Object.prototype.toString.call(val) === '[object Object]';
+}
+/**
+ * Remove all empty objects and undefined values
+ * from a nested object -- an enhanced and vanilla version
+ * of Lodash's `compact`.
+ */
+
+
+function compactObject(data) {
+  if (!isObject(data)) {
+    return data;
+  }
+
+  return Object.keys(data).reduce(function (accumulator, key) {
+    var isObj = isObject(data[key]);
+    var value = isObj ? compactObject(data[key]) : data[key];
+    var isEmptyObject = isObj && !Object.keys(value).length;
+
+    if (value === undefined || isEmptyObject) {
+      return accumulator;
+    }
+
+    return Object.assign(accumulator, _defineProperty({}, key, value));
+  }, {});
+}
+/* iterates the stats graph recursively. */
+
+
+function walkStats(stats, base, resultSet) {
+  if (!base || resultSet.has(base.id)) {
+    return;
+  }
+
+  resultSet.set(base.id, base);
+  Object.keys(base).forEach(function (name) {
+    if (name.endsWith('Id')) {
+      walkStats(stats, stats.get(base[name]), resultSet);
+    } else if (name.endsWith('Ids')) {
+      base[name].forEach(function (id) {
+        walkStats(stats, stats.get(id), resultSet);
+      });
+    }
+  });
+}
+/* filter getStats for a sender/receiver track. */
+
+
+function filterStats(result, track, outbound) {
+  var streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';
+  var filteredResult = new Map();
+
+  if (track === null) {
+    return filteredResult;
+  }
+
+  var trackStats = [];
+  result.forEach(function (value) {
+    if (value.type === 'track' && value.trackIdentifier === track.id) {
+      trackStats.push(value);
+    }
+  });
+  trackStats.forEach(function (trackStat) {
+    result.forEach(function (stats) {
+      if (stats.type === streamStatsType && stats.trackId === trackStat.id) {
+        walkStats(result, stats, filteredResult);
+      }
+    });
+  });
+  return filteredResult;
+}
+},{}],"s6SN":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetUserMedia = shimGetUserMedia;
+
+var utils = _interopRequireWildcard(require("../utils.js"));
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+var logging = utils.log;
+
+function shimGetUserMedia(window) {
+  var navigator = window && window.navigator;
+
+  if (!navigator.mediaDevices) {
+    return;
+  }
+
+  var browserDetails = utils.detectBrowser(window);
+
+  var constraintsToChrome_ = function (c) {
+    if (_typeof(c) !== 'object' || c.mandatory || c.optional) {
+      return c;
+    }
+
+    var cc = {};
+    Object.keys(c).forEach(function (key) {
+      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
+        return;
+      }
+
+      var r = _typeof(c[key]) === 'object' ? c[key] : {
+        ideal: c[key]
+      };
+
+      if (r.exact !== undefined && typeof r.exact === 'number') {
+        r.min = r.max = r.exact;
+      }
+
+      var oldname_ = function (prefix, name) {
+        if (prefix) {
+          return prefix + name.charAt(0).toUpperCase() + name.slice(1);
+        }
+
+        return name === 'deviceId' ? 'sourceId' : name;
+      };
+
+      if (r.ideal !== undefined) {
+        cc.optional = cc.optional || [];
+        var oc = {};
+
+        if (typeof r.ideal === 'number') {
+          oc[oldname_('min', key)] = r.ideal;
+          cc.optional.push(oc);
+          oc = {};
+          oc[oldname_('max', key)] = r.ideal;
+          cc.optional.push(oc);
+        } else {
+          oc[oldname_('', key)] = r.ideal;
+          cc.optional.push(oc);
+        }
+      }
+
+      if (r.exact !== undefined && typeof r.exact !== 'number') {
+        cc.mandatory = cc.mandatory || {};
+        cc.mandatory[oldname_('', key)] = r.exact;
+      } else {
+        ['min', 'max'].forEach(function (mix) {
+          if (r[mix] !== undefined) {
+            cc.mandatory = cc.mandatory || {};
+            cc.mandatory[oldname_(mix, key)] = r[mix];
+          }
+        });
+      }
+    });
+
+    if (c.advanced) {
+      cc.optional = (cc.optional || []).concat(c.advanced);
+    }
+
+    return cc;
+  };
+
+  var shimConstraints_ = function (constraints, func) {
+    if (browserDetails.version >= 61) {
+      return func(constraints);
+    }
+
+    constraints = JSON.parse(JSON.stringify(constraints));
+
+    if (constraints && _typeof(constraints.audio) === 'object') {
+      var remap = function (obj, a, b) {
+        if (a in obj && !(b in obj)) {
+          obj[b] = obj[a];
+          delete obj[a];
+        }
+      };
+
+      constraints = JSON.parse(JSON.stringify(constraints));
+      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');
+      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');
+      constraints.audio = constraintsToChrome_(constraints.audio);
+    }
+
+    if (constraints && _typeof(constraints.video) === 'object') {
+      // Shim facingMode for mobile & surface pro.
+      var face = constraints.video.facingMode;
+      face = face && (_typeof(face) === 'object' ? face : {
+        ideal: face
+      });
+      var getSupportedFacingModeLies = browserDetails.version < 66;
+
+      if (face && (face.exact === 'user' || face.exact === 'environment' || face.ideal === 'user' || face.ideal === 'environment') && !(navigator.mediaDevices.getSupportedConstraints && navigator.mediaDevices.getSupportedConstraints().facingMode && !getSupportedFacingModeLies)) {
+        delete constraints.video.facingMode;
+        var matches;
+
+        if (face.exact === 'environment' || face.ideal === 'environment') {
+          matches = ['back', 'rear'];
+        } else if (face.exact === 'user' || face.ideal === 'user') {
+          matches = ['front'];
+        }
+
+        if (matches) {
+          // Look for matches in label, or use last cam for back (typical).
+          return navigator.mediaDevices.enumerateDevices().then(function (devices) {
+            devices = devices.filter(function (d) {
+              return d.kind === 'videoinput';
+            });
+            var dev = devices.find(function (d) {
+              return matches.some(function (match) {
+                return d.label.toLowerCase().includes(match);
+              });
+            });
+
+            if (!dev && devices.length && matches.includes('back')) {
+              dev = devices[devices.length - 1]; // more likely the back cam
+            }
+
+            if (dev) {
+              constraints.video.deviceId = face.exact ? {
+                exact: dev.deviceId
+              } : {
+                ideal: dev.deviceId
+              };
+            }
+
+            constraints.video = constraintsToChrome_(constraints.video);
+            logging('chrome: ' + JSON.stringify(constraints));
+            return func(constraints);
+          });
+        }
+      }
+
+      constraints.video = constraintsToChrome_(constraints.video);
+    }
+
+    logging('chrome: ' + JSON.stringify(constraints));
+    return func(constraints);
+  };
+
+  var shimError_ = function (e) {
+    if (browserDetails.version >= 64) {
+      return e;
+    }
+
+    return {
+      name: {
+        PermissionDeniedError: 'NotAllowedError',
+        PermissionDismissedError: 'NotAllowedError',
+        InvalidStateError: 'NotAllowedError',
+        DevicesNotFoundError: 'NotFoundError',
+        ConstraintNotSatisfiedError: 'OverconstrainedError',
+        TrackStartError: 'NotReadableError',
+        MediaDeviceFailedDueToShutdown: 'NotAllowedError',
+        MediaDeviceKillSwitchOn: 'NotAllowedError',
+        TabCaptureError: 'AbortError',
+        ScreenCaptureError: 'AbortError',
+        DeviceCaptureError: 'AbortError'
+      }[e.name] || e.name,
+      message: e.message,
+      constraint: e.constraint || e.constraintName,
+      toString: function () {
+        return this.name + (this.message && ': ') + this.message;
+      }
+    };
+  };
+
+  var getUserMedia_ = function (constraints, onSuccess, onError) {
+    shimConstraints_(constraints, function (c) {
+      navigator.webkitGetUserMedia(c, onSuccess, function (e) {
+        if (onError) {
+          onError(shimError_(e));
+        }
+      });
+    });
+  };
+
+  navigator.getUserMedia = getUserMedia_.bind(navigator); // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia
+  // function which returns a Promise, it does not accept spec-style
+  // constraints.
+
+  if (navigator.mediaDevices.getUserMedia) {
+    var origGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
+
+    navigator.mediaDevices.getUserMedia = function (cs) {
+      return shimConstraints_(cs, function (c) {
+        return origGetUserMedia(c).then(function (stream) {
+          if (c.audio && !stream.getAudioTracks().length || c.video && !stream.getVideoTracks().length) {
+            stream.getTracks().forEach(function (track) {
+              track.stop();
+            });
+            throw new DOMException('', 'NotFoundError');
+          }
+
+          return stream;
+        }, function (e) {
+          return Promise.reject(shimError_(e));
+        });
+      });
+    };
+  }
+}
+},{"../utils.js":"iSxC"}],"VHa8":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetDisplayMedia = shimGetDisplayMedia;
+
+function shimGetDisplayMedia(window, getSourceId) {
+  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
+    return;
+  }
+
+  if (!window.navigator.mediaDevices) {
+    return;
+  } // getSourceId is a function that returns a promise resolving with
+  // the sourceId of the screen/window/tab to be shared.
+
+
+  if (typeof getSourceId !== 'function') {
+    console.error('shimGetDisplayMedia: getSourceId argument is not ' + 'a function');
+    return;
+  }
+
+  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {
+    return getSourceId(constraints).then(function (sourceId) {
+      var widthSpecified = constraints.video && constraints.video.width;
+      var heightSpecified = constraints.video && constraints.video.height;
+      var frameRateSpecified = constraints.video && constraints.video.frameRate;
+      constraints.video = {
+        mandatory: {
+          chromeMediaSource: 'desktop',
+          chromeMediaSourceId: sourceId,
+          maxFrameRate: frameRateSpecified || 3
+        }
+      };
+
+      if (widthSpecified) {
+        constraints.video.mandatory.maxWidth = widthSpecified;
+      }
+
+      if (heightSpecified) {
+        constraints.video.mandatory.maxHeight = heightSpecified;
+      }
+
+      return window.navigator.mediaDevices.getUserMedia(constraints);
+    });
+  };
+}
+},{}],"uI5X":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimMediaStream = shimMediaStream;
+exports.shimOnTrack = shimOnTrack;
+exports.shimGetSendersWithDtmf = shimGetSendersWithDtmf;
+exports.shimGetStats = shimGetStats;
+exports.shimSenderReceiverGetStats = shimSenderReceiverGetStats;
+exports.shimAddTrackRemoveTrackWithNative = shimAddTrackRemoveTrackWithNative;
+exports.shimAddTrackRemoveTrack = shimAddTrackRemoveTrack;
+exports.shimPeerConnection = shimPeerConnection;
+exports.fixNegotiationNeeded = fixNegotiationNeeded;
+Object.defineProperty(exports, "shimGetUserMedia", {
+  enumerable: true,
+  get: function () {
+    return _getusermedia.shimGetUserMedia;
+  }
+});
+Object.defineProperty(exports, "shimGetDisplayMedia", {
+  enumerable: true,
+  get: function () {
+    return _getdisplaymedia.shimGetDisplayMedia;
+  }
+});
+
+var utils = _interopRequireWildcard(require("../utils.js"));
+
+var _getusermedia = require("./getusermedia");
+
+var _getdisplaymedia = require("./getdisplaymedia");
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function shimMediaStream(window) {
+  window.MediaStream = window.MediaStream || window.webkitMediaStream;
+}
+
+function shimOnTrack(window) {
+  if (_typeof(window) === 'object' && window.RTCPeerConnection && !('ontrack' in window.RTCPeerConnection.prototype)) {
+    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
+      get: function () {
+        return this._ontrack;
+      },
+      set: function (f) {
+        if (this._ontrack) {
+          this.removeEventListener('track', this._ontrack);
+        }
+
+        this.addEventListener('track', this._ontrack = f);
+      },
+      enumerable: true,
+      configurable: true
+    });
+    var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
+
+    window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
+      var _this = this;
+
+      if (!this._ontrackpoly) {
+        this._ontrackpoly = function (e) {
+          // onaddstream does not fire when a track is added to an existing
+          // stream. But stream.onaddtrack is implemented so we use that.
+          e.stream.addEventListener('addtrack', function (te) {
+            var receiver;
+
+            if (window.RTCPeerConnection.prototype.getReceivers) {
+              receiver = _this.getReceivers().find(function (r) {
+                return r.track && r.track.id === te.track.id;
+              });
+            } else {
+              receiver = {
+                track: te.track
+              };
+            }
+
+            var event = new Event('track');
+            event.track = te.track;
+            event.receiver = receiver;
+            event.transceiver = {
+              receiver: receiver
+            };
+            event.streams = [e.stream];
+
+            _this.dispatchEvent(event);
+          });
+          e.stream.getTracks().forEach(function (track) {
+            var receiver;
+
+            if (window.RTCPeerConnection.prototype.getReceivers) {
+              receiver = _this.getReceivers().find(function (r) {
+                return r.track && r.track.id === track.id;
+              });
+            } else {
+              receiver = {
+                track: track
+              };
+            }
+
+            var event = new Event('track');
+            event.track = track;
+            event.receiver = receiver;
+            event.transceiver = {
+              receiver: receiver
+            };
+            event.streams = [e.stream];
+
+            _this.dispatchEvent(event);
+          });
+        };
+
+        this.addEventListener('addstream', this._ontrackpoly);
+      }
+
+      return origSetRemoteDescription.apply(this, arguments);
+    };
+  } else {
+    // even if RTCRtpTransceiver is in window, it is only used and
+    // emitted in unified-plan. Unfortunately this means we need
+    // to unconditionally wrap the event.
+    utils.wrapPeerConnectionEvent(window, 'track', function (e) {
+      if (!e.transceiver) {
+        Object.defineProperty(e, 'transceiver', {
+          value: {
+            receiver: e.receiver
+          }
+        });
+      }
+
+      return e;
+    });
+  }
+}
+
+function shimGetSendersWithDtmf(window) {
+  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.
+  if (_typeof(window) === 'object' && window.RTCPeerConnection && !('getSenders' in window.RTCPeerConnection.prototype) && 'createDTMFSender' in window.RTCPeerConnection.prototype) {
+    var shimSenderWithDtmf = function (pc, track) {
+      return {
+        track: track,
+
+        get dtmf() {
+          if (this._dtmf === undefined) {
+            if (track.kind === 'audio') {
+              this._dtmf = pc.createDTMFSender(track);
+            } else {
+              this._dtmf = null;
+            }
+          }
+
+          return this._dtmf;
+        },
+
+        _pc: pc
+      };
+    }; // augment addTrack when getSenders is not available.
+
+
+    if (!window.RTCPeerConnection.prototype.getSenders) {
+      window.RTCPeerConnection.prototype.getSenders = function getSenders() {
+        this._senders = this._senders || [];
+        return this._senders.slice(); // return a copy of the internal state.
+      };
+
+      var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
+
+      window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
+        var sender = origAddTrack.apply(this, arguments);
+
+        if (!sender) {
+          sender = shimSenderWithDtmf(this, track);
+
+          this._senders.push(sender);
+        }
+
+        return sender;
+      };
+
+      var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
+
+      window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
+        origRemoveTrack.apply(this, arguments);
+
+        var idx = this._senders.indexOf(sender);
+
+        if (idx !== -1) {
+          this._senders.splice(idx, 1);
+        }
+      };
+    }
+
+    var origAddStream = window.RTCPeerConnection.prototype.addStream;
+
+    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
+      var _this2 = this;
+
+      this._senders = this._senders || [];
+      origAddStream.apply(this, [stream]);
+      stream.getTracks().forEach(function (track) {
+        _this2._senders.push(shimSenderWithDtmf(_this2, track));
+      });
+    };
+
+    var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
+
+    window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+      var _this3 = this;
+
+      this._senders = this._senders || [];
+      origRemoveStream.apply(this, [stream]);
+      stream.getTracks().forEach(function (track) {
+        var sender = _this3._senders.find(function (s) {
+          return s.track === track;
+        });
+
+        if (sender) {
+          // remove sender
+          _this3._senders.splice(_this3._senders.indexOf(sender), 1);
+        }
+      });
+    };
+  } else if (_typeof(window) === 'object' && window.RTCPeerConnection && 'getSenders' in window.RTCPeerConnection.prototype && 'createDTMFSender' in window.RTCPeerConnection.prototype && window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {
+    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
+
+    window.RTCPeerConnection.prototype.getSenders = function getSenders() {
+      var _this4 = this;
+
+      var senders = origGetSenders.apply(this, []);
+      senders.forEach(function (sender) {
+        return sender._pc = _this4;
+      });
+      return senders;
+    };
+
+    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {
+      get: function () {
+        if (this._dtmf === undefined) {
+          if (this.track.kind === 'audio') {
+            this._dtmf = this._pc.createDTMFSender(this.track);
+          } else {
+            this._dtmf = null;
+          }
+        }
+
+        return this._dtmf;
+      }
+    });
+  }
+}
+
+function shimGetStats(window) {
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+
+  var origGetStats = window.RTCPeerConnection.prototype.getStats;
+
+  window.RTCPeerConnection.prototype.getStats = function getStats() {
+    var _this5 = this;
+
+    var [selector, onSucc, onErr] = arguments; // If selector is a function then we are in the old style stats so just
+    // pass back the original getStats format to avoid breaking old users.
+
+    if (arguments.length > 0 && typeof selector === 'function') {
+      return origGetStats.apply(this, arguments);
+    } // When spec-style getStats is supported, return those when called with
+    // either no arguments or the selector argument is null.
+
+
+    if (origGetStats.length === 0 && (arguments.length === 0 || typeof selector !== 'function')) {
+      return origGetStats.apply(this, []);
+    }
+
+    var fixChromeStats_ = function (response) {
+      var standardReport = {};
+      var reports = response.result();
+      reports.forEach(function (report) {
+        var standardStats = {
+          id: report.id,
+          timestamp: report.timestamp,
+          type: {
+            localcandidate: 'local-candidate',
+            remotecandidate: 'remote-candidate'
+          }[report.type] || report.type
+        };
+        report.names().forEach(function (name) {
+          standardStats[name] = report.stat(name);
+        });
+        standardReport[standardStats.id] = standardStats;
+      });
+      return standardReport;
+    }; // shim getStats with maplike support
+
+
+    var makeMapStats = function (stats) {
+      return new Map(Object.keys(stats).map(function (key) {
+        return [key, stats[key]];
+      }));
+    };
+
+    if (arguments.length >= 2) {
+      var successCallbackWrapper_ = function (response) {
+        onSucc(makeMapStats(fixChromeStats_(response)));
+      };
+
+      return origGetStats.apply(this, [successCallbackWrapper_, selector]);
+    } // promise-support
+
+
+    return new Promise(function (resolve, reject) {
+      origGetStats.apply(_this5, [function (response) {
+        resolve(makeMapStats(fixChromeStats_(response)));
+      }, reject]);
+    }).then(onSucc, onErr);
+  };
+}
+
+function shimSenderReceiverGetStats(window) {
+  if (!(_typeof(window) === 'object' && window.RTCPeerConnection && window.RTCRtpSender && window.RTCRtpReceiver)) {
+    return;
+  } // shim sender stats.
+
+
+  if (!('getStats' in window.RTCRtpSender.prototype)) {
+    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
+
+    if (origGetSenders) {
+      window.RTCPeerConnection.prototype.getSenders = function getSenders() {
+        var _this6 = this;
+
+        var senders = origGetSenders.apply(this, []);
+        senders.forEach(function (sender) {
+          return sender._pc = _this6;
+        });
+        return senders;
+      };
+    }
+
+    var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
+
+    if (origAddTrack) {
+      window.RTCPeerConnection.prototype.addTrack = function addTrack() {
+        var sender = origAddTrack.apply(this, arguments);
+        sender._pc = this;
+        return sender;
+      };
+    }
+
+    window.RTCRtpSender.prototype.getStats = function getStats() {
+      var sender = this;
+      return this._pc.getStats().then(function (result) {
+        return (
+          /* Note: this will include stats of all senders that
+           *   send a track with the same id as sender.track as
+           *   it is not possible to identify the RTCRtpSender.
+           */
+          utils.filterStats(result, sender.track, true)
+        );
+      });
+    };
+  } // shim receiver stats.
+
+
+  if (!('getStats' in window.RTCRtpReceiver.prototype)) {
+    var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
+
+    if (origGetReceivers) {
+      window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {
+        var _this7 = this;
+
+        var receivers = origGetReceivers.apply(this, []);
+        receivers.forEach(function (receiver) {
+          return receiver._pc = _this7;
+        });
+        return receivers;
+      };
+    }
+
+    utils.wrapPeerConnectionEvent(window, 'track', function (e) {
+      e.receiver._pc = e.srcElement;
+      return e;
+    });
+
+    window.RTCRtpReceiver.prototype.getStats = function getStats() {
+      var receiver = this;
+      return this._pc.getStats().then(function (result) {
+        return utils.filterStats(result, receiver.track, false);
+      });
+    };
+  }
+
+  if (!('getStats' in window.RTCRtpSender.prototype && 'getStats' in window.RTCRtpReceiver.prototype)) {
+    return;
+  } // shim RTCPeerConnection.getStats(track).
+
+
+  var origGetStats = window.RTCPeerConnection.prototype.getStats;
+
+  window.RTCPeerConnection.prototype.getStats = function getStats() {
+    if (arguments.length > 0 && arguments[0] instanceof window.MediaStreamTrack) {
+      var track = arguments[0];
+      var sender;
+      var receiver;
+      var err;
+      this.getSenders().forEach(function (s) {
+        if (s.track === track) {
+          if (sender) {
+            err = true;
+          } else {
+            sender = s;
+          }
+        }
+      });
+      this.getReceivers().forEach(function (r) {
+        if (r.track === track) {
+          if (receiver) {
+            err = true;
+          } else {
+            receiver = r;
+          }
+        }
+
+        return r.track === track;
+      });
+
+      if (err || sender && receiver) {
+        return Promise.reject(new DOMException('There are more than one sender or receiver for the track.', 'InvalidAccessError'));
+      } else if (sender) {
+        return sender.getStats();
+      } else if (receiver) {
+        return receiver.getStats();
+      }
+
+      return Promise.reject(new DOMException('There is no sender or receiver for the track.', 'InvalidAccessError'));
+    }
+
+    return origGetStats.apply(this, arguments);
+  };
+}
+
+function shimAddTrackRemoveTrackWithNative(window) {
+  // shim addTrack/removeTrack with native variants in order to make
+  // the interactions with legacy getLocalStreams behave as in other browsers.
+  // Keeps a mapping stream.id => [stream, rtpsenders...]
+  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
+    var _this8 = this;
+
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+    return Object.keys(this._shimmedLocalStreams).map(function (streamId) {
+      return _this8._shimmedLocalStreams[streamId][0];
+    });
+  };
+
+  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
+
+  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
+    if (!stream) {
+      return origAddTrack.apply(this, arguments);
+    }
+
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+    var sender = origAddTrack.apply(this, arguments);
+
+    if (!this._shimmedLocalStreams[stream.id]) {
+      this._shimmedLocalStreams[stream.id] = [stream, sender];
+    } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {
+      this._shimmedLocalStreams[stream.id].push(sender);
+    }
+
+    return sender;
+  };
+
+  var origAddStream = window.RTCPeerConnection.prototype.addStream;
+
+  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
+    var _this9 = this;
+
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+    stream.getTracks().forEach(function (track) {
+      var alreadyExists = _this9.getSenders().find(function (s) {
+        return s.track === track;
+      });
+
+      if (alreadyExists) {
+        throw new DOMException('Track already exists.', 'InvalidAccessError');
+      }
+    });
+    var existingSenders = this.getSenders();
+    origAddStream.apply(this, arguments);
+    var newSenders = this.getSenders().filter(function (newSender) {
+      return existingSenders.indexOf(newSender) === -1;
+    });
+    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);
+  };
+
+  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
+
+  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+    delete this._shimmedLocalStreams[stream.id];
+    return origRemoveStream.apply(this, arguments);
+  };
+
+  var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
+
+  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
+    var _this10 = this;
+
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+
+    if (sender) {
+      Object.keys(this._shimmedLocalStreams).forEach(function (streamId) {
+        var idx = _this10._shimmedLocalStreams[streamId].indexOf(sender);
+
+        if (idx !== -1) {
+          _this10._shimmedLocalStreams[streamId].splice(idx, 1);
+        }
+
+        if (_this10._shimmedLocalStreams[streamId].length === 1) {
+          delete _this10._shimmedLocalStreams[streamId];
+        }
+      });
+    }
+
+    return origRemoveTrack.apply(this, arguments);
+  };
+}
+
+function shimAddTrackRemoveTrack(window) {
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+
+  var browserDetails = utils.detectBrowser(window); // shim addTrack and removeTrack.
+
+  if (window.RTCPeerConnection.prototype.addTrack && browserDetails.version >= 65) {
+    return shimAddTrackRemoveTrackWithNative(window);
+  } // also shim pc.getLocalStreams when addTrack is shimmed
+  // to return the original streams.
+
+
+  var origGetLocalStreams = window.RTCPeerConnection.prototype.getLocalStreams;
+
+  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
+    var _this11 = this;
+
+    var nativeStreams = origGetLocalStreams.apply(this);
+    this._reverseStreams = this._reverseStreams || {};
+    return nativeStreams.map(function (stream) {
+      return _this11._reverseStreams[stream.id];
+    });
+  };
+
+  var origAddStream = window.RTCPeerConnection.prototype.addStream;
+
+  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
+    var _this12 = this;
+
+    this._streams = this._streams || {};
+    this._reverseStreams = this._reverseStreams || {};
+    stream.getTracks().forEach(function (track) {
+      var alreadyExists = _this12.getSenders().find(function (s) {
+        return s.track === track;
+      });
+
+      if (alreadyExists) {
+        throw new DOMException('Track already exists.', 'InvalidAccessError');
+      }
+    }); // Add identity mapping for consistency with addTrack.
+    // Unless this is being used with a stream from addTrack.
+
+    if (!this._reverseStreams[stream.id]) {
+      var newStream = new window.MediaStream(stream.getTracks());
+      this._streams[stream.id] = newStream;
+      this._reverseStreams[newStream.id] = stream;
+      stream = newStream;
+    }
+
+    origAddStream.apply(this, [stream]);
+  };
+
+  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
+
+  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+    this._streams = this._streams || {};
+    this._reverseStreams = this._reverseStreams || {};
+    origRemoveStream.apply(this, [this._streams[stream.id] || stream]);
+    delete this._reverseStreams[this._streams[stream.id] ? this._streams[stream.id].id : stream.id];
+    delete this._streams[stream.id];
+  };
+
+  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
+    var _this13 = this;
+
+    if (this.signalingState === 'closed') {
+      throw new DOMException('The RTCPeerConnection\'s signalingState is \'closed\'.', 'InvalidStateError');
+    }
+
+    var streams = [].slice.call(arguments, 1);
+
+    if (streams.length !== 1 || !streams[0].getTracks().find(function (t) {
+      return t === track;
+    })) {
+      // this is not fully correct but all we can manage without
+      // [[associated MediaStreams]] internal slot.
+      throw new DOMException('The adapter.js addTrack polyfill only supports a single ' + ' stream which is associated with the specified track.', 'NotSupportedError');
+    }
+
+    var alreadyExists = this.getSenders().find(function (s) {
+      return s.track === track;
+    });
+
+    if (alreadyExists) {
+      throw new DOMException('Track already exists.', 'InvalidAccessError');
+    }
+
+    this._streams = this._streams || {};
+    this._reverseStreams = this._reverseStreams || {};
+    var oldStream = this._streams[stream.id];
+
+    if (oldStream) {
+      // this is using odd Chrome behaviour, use with caution:
+      // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815
+      // Note: we rely on the high-level addTrack/dtmf shim to
+      // create the sender with a dtmf sender.
+      oldStream.addTrack(track); // Trigger ONN async.
+
+      Promise.resolve().then(function () {
+        _this13.dispatchEvent(new Event('negotiationneeded'));
+      });
+    } else {
+      var newStream = new window.MediaStream([track]);
+      this._streams[stream.id] = newStream;
+      this._reverseStreams[newStream.id] = stream;
+      this.addStream(newStream);
+    }
+
+    return this.getSenders().find(function (s) {
+      return s.track === track;
+    });
+  }; // replace the internal stream id with the external one and
+  // vice versa.
+
+
+  function replaceInternalStreamId(pc, description) {
+    var sdp = description.sdp;
+    Object.keys(pc._reverseStreams || []).forEach(function (internalId) {
+      var externalStream = pc._reverseStreams[internalId];
+      var internalStream = pc._streams[externalStream.id];
+      sdp = sdp.replace(new RegExp(internalStream.id, 'g'), externalStream.id);
+    });
+    return new RTCSessionDescription({
+      type: description.type,
+      sdp: sdp
+    });
+  }
+
+  function replaceExternalStreamId(pc, description) {
+    var sdp = description.sdp;
+    Object.keys(pc._reverseStreams || []).forEach(function (internalId) {
+      var externalStream = pc._reverseStreams[internalId];
+      var internalStream = pc._streams[externalStream.id];
+      sdp = sdp.replace(new RegExp(externalStream.id, 'g'), internalStream.id);
+    });
+    return new RTCSessionDescription({
+      type: description.type,
+      sdp: sdp
+    });
+  }
+
+  ['createOffer', 'createAnswer'].forEach(function (method) {
+    var nativeMethod = window.RTCPeerConnection.prototype[method];
+
+    var methodObj = _defineProperty({}, method, function () {
+      var _this14 = this;
+
+      var args = arguments;
+      var isLegacyCall = arguments.length && typeof arguments[0] === 'function';
+
+      if (isLegacyCall) {
+        return nativeMethod.apply(this, [function (description) {
+          var desc = replaceInternalStreamId(_this14, description);
+          args[0].apply(null, [desc]);
+        }, function (err) {
+          if (args[1]) {
+            args[1].apply(null, err);
+          }
+        }, arguments[2]]);
+      }
+
+      return nativeMethod.apply(this, arguments).then(function (description) {
+        return replaceInternalStreamId(_this14, description);
+      });
+    });
+
+    window.RTCPeerConnection.prototype[method] = methodObj[method];
+  });
+  var origSetLocalDescription = window.RTCPeerConnection.prototype.setLocalDescription;
+
+  window.RTCPeerConnection.prototype.setLocalDescription = function setLocalDescription() {
+    if (!arguments.length || !arguments[0].type) {
+      return origSetLocalDescription.apply(this, arguments);
+    }
+
+    arguments[0] = replaceExternalStreamId(this, arguments[0]);
+    return origSetLocalDescription.apply(this, arguments);
+  }; // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier
+
+
+  var origLocalDescription = Object.getOwnPropertyDescriptor(window.RTCPeerConnection.prototype, 'localDescription');
+  Object.defineProperty(window.RTCPeerConnection.prototype, 'localDescription', {
+    get: function () {
+      var description = origLocalDescription.get.apply(this);
+
+      if (description.type === '') {
+        return description;
+      }
+
+      return replaceInternalStreamId(this, description);
+    }
+  });
+
+  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
+    var _this15 = this;
+
+    if (this.signalingState === 'closed') {
+      throw new DOMException('The RTCPeerConnection\'s signalingState is \'closed\'.', 'InvalidStateError');
+    } // We can not yet check for sender instanceof RTCRtpSender
+    // since we shim RTPSender. So we check if sender._pc is set.
+
+
+    if (!sender._pc) {
+      throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' + 'does not implement interface RTCRtpSender.', 'TypeError');
+    }
+
+    var isLocal = sender._pc === this;
+
+    if (!isLocal) {
+      throw new DOMException('Sender was not created by this connection.', 'InvalidAccessError');
+    } // Search for the native stream the senders track belongs to.
+
+
+    this._streams = this._streams || {};
+    var stream;
+    Object.keys(this._streams).forEach(function (streamid) {
+      var hasTrack = _this15._streams[streamid].getTracks().find(function (track) {
+        return sender.track === track;
+      });
+
+      if (hasTrack) {
+        stream = _this15._streams[streamid];
+      }
+    });
+
+    if (stream) {
+      if (stream.getTracks().length === 1) {
+        // if this is the last track of the stream, remove the stream. This
+        // takes care of any shimmed _senders.
+        this.removeStream(this._reverseStreams[stream.id]);
+      } else {
+        // relying on the same odd chrome behaviour as above.
+        stream.removeTrack(sender.track);
+      }
+
+      this.dispatchEvent(new Event('negotiationneeded'));
+    }
+  };
+}
+
+function shimPeerConnection(window) {
+  var browserDetails = utils.detectBrowser(window);
+
+  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {
+    // very basic support for old versions.
+    window.RTCPeerConnection = window.webkitRTCPeerConnection;
+  }
+
+  if (!window.RTCPeerConnection) {
+    return;
+  } // shim implicit creation of RTCSessionDescription/RTCIceCandidate
+
+
+  if (browserDetails.version < 53) {
+    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
+      var nativeMethod = window.RTCPeerConnection.prototype[method];
+
+      var methodObj = _defineProperty({}, method, function () {
+        arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
+        return nativeMethod.apply(this, arguments);
+      });
+
+      window.RTCPeerConnection.prototype[method] = methodObj[method];
+    });
+  } // support for addIceCandidate(null or undefined)
+
+
+  var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;
+
+  window.RTCPeerConnection.prototype.addIceCandidate = function addIceCandidate() {
+    if (!arguments[0]) {
+      if (arguments[1]) {
+        arguments[1].apply(null);
+      }
+
+      return Promise.resolve();
+    } // Firefox 68+ emits and processes {candidate: "", ...}, ignore
+    // in older versions. Native support planned for Chrome M77.
+
+
+    if (browserDetails.version < 78 && arguments[0] && arguments[0].candidate === '') {
+      return Promise.resolve();
+    }
+
+    return nativeAddIceCandidate.apply(this, arguments);
+  };
+}
+
+function fixNegotiationNeeded(window) {
+  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', function (e) {
+    var pc = e.target;
+
+    if (pc.signalingState !== 'stable') {
+      return;
+    }
+
+    return e;
+  });
+}
+},{"../utils.js":"iSxC","./getusermedia":"s6SN","./getdisplaymedia":"VHa8"}],"6NZ1":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.filterIceServers = filterIceServers;
+
+var utils = _interopRequireWildcard(require("../utils"));
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+// Edge does not like
+// 1) stun: filtered after 14393 unless ?transport=udp is present
+// 2) turn: that does not have all of turn:host:port?transport=udp
+// 3) turn: with ipv6 addresses
+// 4) turn: occurring muliple times
+function filterIceServers(iceServers, edgeVersion) {
+  var hasTurn = false;
+  iceServers = JSON.parse(JSON.stringify(iceServers));
+  return iceServers.filter(function (server) {
+    if (server && (server.urls || server.url)) {
+      var urls = server.urls || server.url;
+
+      if (server.url && !server.urls) {
+        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');
+      }
+
+      var isString = typeof urls === 'string';
+
+      if (isString) {
+        urls = [urls];
+      }
+
+      urls = urls.filter(function (url) {
+        // filter STUN unconditionally.
+        if (url.indexOf('stun:') === 0) {
+          return false;
+        }
+
+        var validTurn = url.startsWith('turn') && !url.startsWith('turn:[') && url.includes('transport=udp');
+
+        if (validTurn && !hasTurn) {
+          hasTurn = true;
+          return true;
+        }
+
+        return validTurn && !hasTurn;
+      });
+      delete server.url;
+      server.urls = isString ? urls[0] : urls;
+      return !!urls.length;
+    }
+  });
+}
+},{"../utils":"iSxC"}],"YHvh":[function(require,module,exports) {
+/* eslint-env node */
+'use strict';
+
+// SDP helpers.
+var SDPUtils = {};
+
+// Generate an alphanumeric identifier for cname or mids.
+// TODO: use UUIDs instead? https://gist.github.com/jed/982883
+SDPUtils.generateIdentifier = function() {
+  return Math.random().toString(36).substr(2, 10);
+};
+
+// The RTCP CNAME used by all peerconnections from the same JS.
+SDPUtils.localCName = SDPUtils.generateIdentifier();
+
+// Splits SDP into lines, dealing with both CRLF and LF.
+SDPUtils.splitLines = function(blob) {
+  return blob.trim().split('\n').map(function(line) {
+    return line.trim();
+  });
+};
+// Splits SDP into sessionpart and mediasections. Ensures CRLF.
+SDPUtils.splitSections = function(blob) {
+  var parts = blob.split('\nm=');
+  return parts.map(function(part, index) {
+    return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
+  });
+};
+
+// returns the session description.
+SDPUtils.getDescription = function(blob) {
+  var sections = SDPUtils.splitSections(blob);
+  return sections && sections[0];
+};
+
+// returns the individual media sections.
+SDPUtils.getMediaSections = function(blob) {
+  var sections = SDPUtils.splitSections(blob);
+  sections.shift();
+  return sections;
+};
+
+// Returns lines that start with a certain prefix.
+SDPUtils.matchPrefix = function(blob, prefix) {
+  return SDPUtils.splitLines(blob).filter(function(line) {
+    return line.indexOf(prefix) === 0;
+  });
+};
+
+// Parses an ICE candidate line. Sample input:
+// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8
+// rport 55996"
+SDPUtils.parseCandidate = function(line) {
+  var parts;
+  // Parse both variants.
+  if (line.indexOf('a=candidate:') === 0) {
+    parts = line.substring(12).split(' ');
+  } else {
+    parts = line.substring(10).split(' ');
+  }
+
+  var candidate = {
+    foundation: parts[0],
+    component: parseInt(parts[1], 10),
+    protocol: parts[2].toLowerCase(),
+    priority: parseInt(parts[3], 10),
+    ip: parts[4],
+    address: parts[4], // address is an alias for ip.
+    port: parseInt(parts[5], 10),
+    // skip parts[6] == 'typ'
+    type: parts[7]
+  };
+
+  for (var i = 8; i < parts.length; i += 2) {
+    switch (parts[i]) {
+      case 'raddr':
+        candidate.relatedAddress = parts[i + 1];
+        break;
+      case 'rport':
+        candidate.relatedPort = parseInt(parts[i + 1], 10);
+        break;
+      case 'tcptype':
+        candidate.tcpType = parts[i + 1];
+        break;
+      case 'ufrag':
+        candidate.ufrag = parts[i + 1]; // for backward compability.
+        candidate.usernameFragment = parts[i + 1];
+        break;
+      default: // extension handling, in particular ufrag
+        candidate[parts[i]] = parts[i + 1];
+        break;
+    }
+  }
+  return candidate;
+};
+
+// Translates a candidate object into SDP candidate attribute.
+SDPUtils.writeCandidate = function(candidate) {
+  var sdp = [];
+  sdp.push(candidate.foundation);
+  sdp.push(candidate.component);
+  sdp.push(candidate.protocol.toUpperCase());
+  sdp.push(candidate.priority);
+  sdp.push(candidate.address || candidate.ip);
+  sdp.push(candidate.port);
+
+  var type = candidate.type;
+  sdp.push('typ');
+  sdp.push(type);
+  if (type !== 'host' && candidate.relatedAddress &&
+      candidate.relatedPort) {
+    sdp.push('raddr');
+    sdp.push(candidate.relatedAddress);
+    sdp.push('rport');
+    sdp.push(candidate.relatedPort);
+  }
+  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {
+    sdp.push('tcptype');
+    sdp.push(candidate.tcpType);
+  }
+  if (candidate.usernameFragment || candidate.ufrag) {
+    sdp.push('ufrag');
+    sdp.push(candidate.usernameFragment || candidate.ufrag);
+  }
+  return 'candidate:' + sdp.join(' ');
+};
+
+// Parses an ice-options line, returns an array of option tags.
+// a=ice-options:foo bar
+SDPUtils.parseIceOptions = function(line) {
+  return line.substr(14).split(' ');
+};
+
+// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:
+// a=rtpmap:111 opus/48000/2
+SDPUtils.parseRtpMap = function(line) {
+  var parts = line.substr(9).split(' ');
+  var parsed = {
+    payloadType: parseInt(parts.shift(), 10) // was: id
+  };
+
+  parts = parts[0].split('/');
+
+  parsed.name = parts[0];
+  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate
+  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;
+  // legacy alias, got renamed back to channels in ORTC.
+  parsed.numChannels = parsed.channels;
+  return parsed;
+};
+
+// Generate an a=rtpmap line from RTCRtpCodecCapability or
+// RTCRtpCodecParameters.
+SDPUtils.writeRtpMap = function(codec) {
+  var pt = codec.payloadType;
+  if (codec.preferredPayloadType !== undefined) {
+    pt = codec.preferredPayloadType;
+  }
+  var channels = codec.channels || codec.numChannels || 1;
+  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +
+      (channels !== 1 ? '/' + channels : '') + '\r\n';
+};
+
+// Parses an a=extmap line (headerextension from RFC 5285). Sample input:
+// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
+// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset
+SDPUtils.parseExtmap = function(line) {
+  var parts = line.substr(9).split(' ');
+  return {
+    id: parseInt(parts[0], 10),
+    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',
+    uri: parts[1]
+  };
+};
+
+// Generates a=extmap line from RTCRtpHeaderExtensionParameters or
+// RTCRtpHeaderExtension.
+SDPUtils.writeExtmap = function(headerExtension) {
+  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +
+      (headerExtension.direction && headerExtension.direction !== 'sendrecv'
+        ? '/' + headerExtension.direction
+        : '') +
+      ' ' + headerExtension.uri + '\r\n';
+};
+
+// Parses an ftmp line, returns dictionary. Sample input:
+// a=fmtp:96 vbr=on;cng=on
+// Also deals with vbr=on; cng=on
+SDPUtils.parseFmtp = function(line) {
+  var parsed = {};
+  var kv;
+  var parts = line.substr(line.indexOf(' ') + 1).split(';');
+  for (var j = 0; j < parts.length; j++) {
+    kv = parts[j].trim().split('=');
+    parsed[kv[0].trim()] = kv[1];
+  }
+  return parsed;
+};
+
+// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.
+SDPUtils.writeFmtp = function(codec) {
+  var line = '';
+  var pt = codec.payloadType;
+  if (codec.preferredPayloadType !== undefined) {
+    pt = codec.preferredPayloadType;
+  }
+  if (codec.parameters && Object.keys(codec.parameters).length) {
+    var params = [];
+    Object.keys(codec.parameters).forEach(function(param) {
+      if (codec.parameters[param]) {
+        params.push(param + '=' + codec.parameters[param]);
+      } else {
+        params.push(param);
+      }
+    });
+    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\r\n';
+  }
+  return line;
+};
+
+// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:
+// a=rtcp-fb:98 nack rpsi
+SDPUtils.parseRtcpFb = function(line) {
+  var parts = line.substr(line.indexOf(' ') + 1).split(' ');
+  return {
+    type: parts.shift(),
+    parameter: parts.join(' ')
+  };
+};
+// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.
+SDPUtils.writeRtcpFb = function(codec) {
+  var lines = '';
+  var pt = codec.payloadType;
+  if (codec.preferredPayloadType !== undefined) {
+    pt = codec.preferredPayloadType;
+  }
+  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {
+    // FIXME: special handling for trr-int?
+    codec.rtcpFeedback.forEach(function(fb) {
+      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +
+      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +
+          '\r\n';
+    });
+  }
+  return lines;
+};
+
+// Parses an RFC 5576 ssrc media attribute. Sample input:
+// a=ssrc:3735928559 cname:something
+SDPUtils.parseSsrcMedia = function(line) {
+  var sp = line.indexOf(' ');
+  var parts = {
+    ssrc: parseInt(line.substr(7, sp - 7), 10)
+  };
+  var colon = line.indexOf(':', sp);
+  if (colon > -1) {
+    parts.attribute = line.substr(sp + 1, colon - sp - 1);
+    parts.value = line.substr(colon + 1);
+  } else {
+    parts.attribute = line.substr(sp + 1);
+  }
+  return parts;
+};
+
+SDPUtils.parseSsrcGroup = function(line) {
+  var parts = line.substr(13).split(' ');
+  return {
+    semantics: parts.shift(),
+    ssrcs: parts.map(function(ssrc) {
+      return parseInt(ssrc, 10);
+    })
+  };
+};
+
+// Extracts the MID (RFC 5888) from a media section.
+// returns the MID or undefined if no mid line was found.
+SDPUtils.getMid = function(mediaSection) {
+  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];
+  if (mid) {
+    return mid.substr(6);
+  }
+};
+
+SDPUtils.parseFingerprint = function(line) {
+  var parts = line.substr(14).split(' ');
+  return {
+    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.
+    value: parts[1]
+  };
+};
+
+// Extracts DTLS parameters from SDP media section or sessionpart.
+// FIXME: for consistency with other functions this should only
+//   get the fingerprint line as input. See also getIceParameters.
+SDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {
+  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,
+    'a=fingerprint:');
+  // Note: a=setup line is ignored since we use the 'auto' role.
+  // Note2: 'algorithm' is not case sensitive except in Edge.
+  return {
+    role: 'auto',
+    fingerprints: lines.map(SDPUtils.parseFingerprint)
+  };
+};
+
+// Serializes DTLS parameters to SDP.
+SDPUtils.writeDtlsParameters = function(params, setupType) {
+  var sdp = 'a=setup:' + setupType + '\r\n';
+  params.fingerprints.forEach(function(fp) {
+    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\r\n';
+  });
+  return sdp;
+};
+// Parses ICE information from SDP media section or sessionpart.
+// FIXME: for consistency with other functions this should only
+//   get the ice-ufrag and ice-pwd lines as input.
+SDPUtils.getIceParameters = function(mediaSection, sessionpart) {
+  var lines = SDPUtils.splitLines(mediaSection);
+  // Search in session part, too.
+  lines = lines.concat(SDPUtils.splitLines(sessionpart));
+  var iceParameters = {
+    usernameFragment: lines.filter(function(line) {
+      return line.indexOf('a=ice-ufrag:') === 0;
+    })[0].substr(12),
+    password: lines.filter(function(line) {
+      return line.indexOf('a=ice-pwd:') === 0;
+    })[0].substr(10)
+  };
+  return iceParameters;
+};
+
+// Serializes ICE parameters to SDP.
+SDPUtils.writeIceParameters = function(params) {
+  return 'a=ice-ufrag:' + params.usernameFragment + '\r\n' +
+      'a=ice-pwd:' + params.password + '\r\n';
+};
+
+// Parses the SDP media section and returns RTCRtpParameters.
+SDPUtils.parseRtpParameters = function(mediaSection) {
+  var description = {
+    codecs: [],
+    headerExtensions: [],
+    fecMechanisms: [],
+    rtcp: []
+  };
+  var lines = SDPUtils.splitLines(mediaSection);
+  var mline = lines[0].split(' ');
+  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]
+    var pt = mline[i];
+    var rtpmapline = SDPUtils.matchPrefix(
+      mediaSection, 'a=rtpmap:' + pt + ' ')[0];
+    if (rtpmapline) {
+      var codec = SDPUtils.parseRtpMap(rtpmapline);
+      var fmtps = SDPUtils.matchPrefix(
+        mediaSection, 'a=fmtp:' + pt + ' ');
+      // Only the first a=fmtp:<pt> is considered.
+      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};
+      codec.rtcpFeedback = SDPUtils.matchPrefix(
+        mediaSection, 'a=rtcp-fb:' + pt + ' ')
+        .map(SDPUtils.parseRtcpFb);
+      description.codecs.push(codec);
+      // parse FEC mechanisms from rtpmap lines.
+      switch (codec.name.toUpperCase()) {
+        case 'RED':
+        case 'ULPFEC':
+          description.fecMechanisms.push(codec.name.toUpperCase());
+          break;
+        default: // only RED and ULPFEC are recognized as FEC mechanisms.
+          break;
+      }
+    }
+  }
+  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {
+    description.headerExtensions.push(SDPUtils.parseExtmap(line));
+  });
+  // FIXME: parse rtcp.
+  return description;
+};
+
+// Generates parts of the SDP media section describing the capabilities /
+// parameters.
+SDPUtils.writeRtpDescription = function(kind, caps) {
+  var sdp = '';
+
+  // Build the mline.
+  sdp += 'm=' + kind + ' ';
+  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.
+  sdp += ' UDP/TLS/RTP/SAVPF ';
+  sdp += caps.codecs.map(function(codec) {
+    if (codec.preferredPayloadType !== undefined) {
+      return codec.preferredPayloadType;
+    }
+    return codec.payloadType;
+  }).join(' ') + '\r\n';
+
+  sdp += 'c=IN IP4 0.0.0.0\r\n';
+  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\r\n';
+
+  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.
+  caps.codecs.forEach(function(codec) {
+    sdp += SDPUtils.writeRtpMap(codec);
+    sdp += SDPUtils.writeFmtp(codec);
+    sdp += SDPUtils.writeRtcpFb(codec);
+  });
+  var maxptime = 0;
+  caps.codecs.forEach(function(codec) {
+    if (codec.maxptime > maxptime) {
+      maxptime = codec.maxptime;
+    }
+  });
+  if (maxptime > 0) {
+    sdp += 'a=maxptime:' + maxptime + '\r\n';
+  }
+  sdp += 'a=rtcp-mux\r\n';
+
+  if (caps.headerExtensions) {
+    caps.headerExtensions.forEach(function(extension) {
+      sdp += SDPUtils.writeExtmap(extension);
+    });
+  }
+  // FIXME: write fecMechanisms.
+  return sdp;
+};
+
+// Parses the SDP media section and returns an array of
+// RTCRtpEncodingParameters.
+SDPUtils.parseRtpEncodingParameters = function(mediaSection) {
+  var encodingParameters = [];
+  var description = SDPUtils.parseRtpParameters(mediaSection);
+  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;
+  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;
+
+  // filter a=ssrc:... cname:, ignore PlanB-msid
+  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
+    .map(function(line) {
+      return SDPUtils.parseSsrcMedia(line);
+    })
+    .filter(function(parts) {
+      return parts.attribute === 'cname';
+    });
+  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;
+  var secondarySsrc;
+
+  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')
+    .map(function(line) {
+      var parts = line.substr(17).split(' ');
+      return parts.map(function(part) {
+        return parseInt(part, 10);
+      });
+    });
+  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {
+    secondarySsrc = flows[0][1];
+  }
+
+  description.codecs.forEach(function(codec) {
+    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {
+      var encParam = {
+        ssrc: primarySsrc,
+        codecPayloadType: parseInt(codec.parameters.apt, 10)
+      };
+      if (primarySsrc && secondarySsrc) {
+        encParam.rtx = {ssrc: secondarySsrc};
+      }
+      encodingParameters.push(encParam);
+      if (hasRed) {
+        encParam = JSON.parse(JSON.stringify(encParam));
+        encParam.fec = {
+          ssrc: primarySsrc,
+          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'
+        };
+        encodingParameters.push(encParam);
+      }
+    }
+  });
+  if (encodingParameters.length === 0 && primarySsrc) {
+    encodingParameters.push({
+      ssrc: primarySsrc
+    });
+  }
+
+  // we support both b=AS and b=TIAS but interpret AS as TIAS.
+  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');
+  if (bandwidth.length) {
+    if (bandwidth[0].indexOf('b=TIAS:') === 0) {
+      bandwidth = parseInt(bandwidth[0].substr(7), 10);
+    } else if (bandwidth[0].indexOf('b=AS:') === 0) {
+      // use formula from JSEP to convert b=AS to TIAS value.
+      bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95
+          - (50 * 40 * 8);
+    } else {
+      bandwidth = undefined;
+    }
+    encodingParameters.forEach(function(params) {
+      params.maxBitrate = bandwidth;
+    });
+  }
+  return encodingParameters;
+};
+
+// parses http://draft.ortc.org/#rtcrtcpparameters*
+SDPUtils.parseRtcpParameters = function(mediaSection) {
+  var rtcpParameters = {};
+
+  // Gets the first SSRC. Note tha with RTX there might be multiple
+  // SSRCs.
+  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
+    .map(function(line) {
+      return SDPUtils.parseSsrcMedia(line);
+    })
+    .filter(function(obj) {
+      return obj.attribute === 'cname';
+    })[0];
+  if (remoteSsrc) {
+    rtcpParameters.cname = remoteSsrc.value;
+    rtcpParameters.ssrc = remoteSsrc.ssrc;
+  }
+
+  // Edge uses the compound attribute instead of reducedSize
+  // compound is !reducedSize
+  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');
+  rtcpParameters.reducedSize = rsize.length > 0;
+  rtcpParameters.compound = rsize.length === 0;
+
+  // parses the rtcp-mux attrіbute.
+  // Note that Edge does not support unmuxed RTCP.
+  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');
+  rtcpParameters.mux = mux.length > 0;
+
+  return rtcpParameters;
+};
+
+// parses either a=msid: or a=ssrc:... msid lines and returns
+// the id of the MediaStream and MediaStreamTrack.
+SDPUtils.parseMsid = function(mediaSection) {
+  var parts;
+  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');
+  if (spec.length === 1) {
+    parts = spec[0].substr(7).split(' ');
+    return {stream: parts[0], track: parts[1]};
+  }
+  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
+    .map(function(line) {
+      return SDPUtils.parseSsrcMedia(line);
+    })
+    .filter(function(msidParts) {
+      return msidParts.attribute === 'msid';
+    });
+  if (planB.length > 0) {
+    parts = planB[0].value.split(' ');
+    return {stream: parts[0], track: parts[1]};
+  }
+};
+
+// SCTP
+// parses draft-ietf-mmusic-sctp-sdp-26 first and falls back
+// to draft-ietf-mmusic-sctp-sdp-05
+SDPUtils.parseSctpDescription = function(mediaSection) {
+  var mline = SDPUtils.parseMLine(mediaSection);
+  var maxSizeLine = SDPUtils.matchPrefix(mediaSection, 'a=max-message-size:');
+  var maxMessageSize;
+  if (maxSizeLine.length > 0) {
+    maxMessageSize = parseInt(maxSizeLine[0].substr(19), 10);
+  }
+  if (isNaN(maxMessageSize)) {
+    maxMessageSize = 65536;
+  }
+  var sctpPort = SDPUtils.matchPrefix(mediaSection, 'a=sctp-port:');
+  if (sctpPort.length > 0) {
+    return {
+      port: parseInt(sctpPort[0].substr(12), 10),
+      protocol: mline.fmt,
+      maxMessageSize: maxMessageSize
+    };
+  }
+  var sctpMapLines = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:');
+  if (sctpMapLines.length > 0) {
+    var parts = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:')[0]
+      .substr(10)
+      .split(' ');
+    return {
+      port: parseInt(parts[0], 10),
+      protocol: parts[1],
+      maxMessageSize: maxMessageSize
+    };
+  }
+};
+
+// SCTP
+// outputs the draft-ietf-mmusic-sctp-sdp-26 version that all browsers
+// support by now receiving in this format, unless we originally parsed
+// as the draft-ietf-mmusic-sctp-sdp-05 format (indicated by the m-line
+// protocol of DTLS/SCTP -- without UDP/ or TCP/)
+SDPUtils.writeSctpDescription = function(media, sctp) {
+  var output = [];
+  if (media.protocol !== 'DTLS/SCTP') {
+    output = [
+      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.protocol + '\r\n',
+      'c=IN IP4 0.0.0.0\r\n',
+      'a=sctp-port:' + sctp.port + '\r\n'
+    ];
+  } else {
+    output = [
+      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.port + '\r\n',
+      'c=IN IP4 0.0.0.0\r\n',
+      'a=sctpmap:' + sctp.port + ' ' + sctp.protocol + ' 65535\r\n'
+    ];
+  }
+  if (sctp.maxMessageSize !== undefined) {
+    output.push('a=max-message-size:' + sctp.maxMessageSize + '\r\n');
+  }
+  return output.join('');
+};
+
+// Generate a session ID for SDP.
+// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1
+// recommends using a cryptographically random +ve 64-bit value
+// but right now this should be acceptable and within the right range
+SDPUtils.generateSessionId = function() {
+  return Math.random().toString().substr(2, 21);
+};
+
+// Write boilder plate for start of SDP
+// sessId argument is optional - if not supplied it will
+// be generated randomly
+// sessVersion is optional and defaults to 2
+// sessUser is optional and defaults to 'thisisadapterortc'
+SDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {
+  var sessionId;
+  var version = sessVer !== undefined ? sessVer : 2;
+  if (sessId) {
+    sessionId = sessId;
+  } else {
+    sessionId = SDPUtils.generateSessionId();
+  }
+  var user = sessUser || 'thisisadapterortc';
+  // FIXME: sess-id should be an NTP timestamp.
+  return 'v=0\r\n' +
+      'o=' + user + ' ' + sessionId + ' ' + version +
+        ' IN IP4 127.0.0.1\r\n' +
+      's=-\r\n' +
+      't=0 0\r\n';
+};
+
+SDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {
+  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);
+
+  // Map ICE parameters (ufrag, pwd) to SDP.
+  sdp += SDPUtils.writeIceParameters(
+    transceiver.iceGatherer.getLocalParameters());
+
+  // Map DTLS parameters to SDP.
+  sdp += SDPUtils.writeDtlsParameters(
+    transceiver.dtlsTransport.getLocalParameters(),
+    type === 'offer' ? 'actpass' : 'active');
+
+  sdp += 'a=mid:' + transceiver.mid + '\r\n';
+
+  if (transceiver.direction) {
+    sdp += 'a=' + transceiver.direction + '\r\n';
+  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {
+    sdp += 'a=sendrecv\r\n';
+  } else if (transceiver.rtpSender) {
+    sdp += 'a=sendonly\r\n';
+  } else if (transceiver.rtpReceiver) {
+    sdp += 'a=recvonly\r\n';
+  } else {
+    sdp += 'a=inactive\r\n';
+  }
+
+  if (transceiver.rtpSender) {
+    // spec.
+    var msid = 'msid:' + stream.id + ' ' +
+        transceiver.rtpSender.track.id + '\r\n';
+    sdp += 'a=' + msid;
+
+    // for Chrome.
+    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
+        ' ' + msid;
+    if (transceiver.sendEncodingParameters[0].rtx) {
+      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
+          ' ' + msid;
+      sdp += 'a=ssrc-group:FID ' +
+          transceiver.sendEncodingParameters[0].ssrc + ' ' +
+          transceiver.sendEncodingParameters[0].rtx.ssrc +
+          '\r\n';
+    }
+  }
+  // FIXME: this should be written by writeRtpDescription.
+  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
+      ' cname:' + SDPUtils.localCName + '\r\n';
+  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
+    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
+        ' cname:' + SDPUtils.localCName + '\r\n';
+  }
+  return sdp;
+};
+
+// Gets the direction from the mediaSection or the sessionpart.
+SDPUtils.getDirection = function(mediaSection, sessionpart) {
+  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.
+  var lines = SDPUtils.splitLines(mediaSection);
+  for (var i = 0; i < lines.length; i++) {
+    switch (lines[i]) {
+      case 'a=sendrecv':
+      case 'a=sendonly':
+      case 'a=recvonly':
+      case 'a=inactive':
+        return lines[i].substr(2);
+      default:
+        // FIXME: What should happen here?
+    }
+  }
+  if (sessionpart) {
+    return SDPUtils.getDirection(sessionpart);
+  }
+  return 'sendrecv';
+};
+
+SDPUtils.getKind = function(mediaSection) {
+  var lines = SDPUtils.splitLines(mediaSection);
+  var mline = lines[0].split(' ');
+  return mline[0].substr(2);
+};
+
+SDPUtils.isRejected = function(mediaSection) {
+  return mediaSection.split(' ', 2)[1] === '0';
+};
+
+SDPUtils.parseMLine = function(mediaSection) {
+  var lines = SDPUtils.splitLines(mediaSection);
+  var parts = lines[0].substr(2).split(' ');
+  return {
+    kind: parts[0],
+    port: parseInt(parts[1], 10),
+    protocol: parts[2],
+    fmt: parts.slice(3).join(' ')
+  };
+};
+
+SDPUtils.parseOLine = function(mediaSection) {
+  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];
+  var parts = line.substr(2).split(' ');
+  return {
+    username: parts[0],
+    sessionId: parts[1],
+    sessionVersion: parseInt(parts[2], 10),
+    netType: parts[3],
+    addressType: parts[4],
+    address: parts[5]
+  };
+};
+
+// a very naive interpretation of a valid SDP.
+SDPUtils.isValidSDP = function(blob) {
+  if (typeof blob !== 'string' || blob.length === 0) {
+    return false;
+  }
+  var lines = SDPUtils.splitLines(blob);
+  for (var i = 0; i < lines.length; i++) {
+    if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {
+      return false;
+    }
+    // TODO: check the modifier a bit more.
+  }
+  return true;
+};
+
+// Expose public methods.
+if (typeof module === 'object') {
+  module.exports = SDPUtils;
+}
+
+},{}],"NJ2u":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+var SDPUtils = require('sdp');
+
+function fixStatsType(stat) {
+  return {
+    inboundrtp: 'inbound-rtp',
+    outboundrtp: 'outbound-rtp',
+    candidatepair: 'candidate-pair',
+    localcandidate: 'local-candidate',
+    remotecandidate: 'remote-candidate'
+  }[stat.type] || stat.type;
+}
+
+function writeMediaSection(transceiver, caps, type, stream, dtlsRole) {
+  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps); // Map ICE parameters (ufrag, pwd) to SDP.
+
+  sdp += SDPUtils.writeIceParameters(transceiver.iceGatherer.getLocalParameters()); // Map DTLS parameters to SDP.
+
+  sdp += SDPUtils.writeDtlsParameters(transceiver.dtlsTransport.getLocalParameters(), type === 'offer' ? 'actpass' : dtlsRole || 'active');
+  sdp += 'a=mid:' + transceiver.mid + '\r\n';
+
+  if (transceiver.rtpSender && transceiver.rtpReceiver) {
+    sdp += 'a=sendrecv\r\n';
+  } else if (transceiver.rtpSender) {
+    sdp += 'a=sendonly\r\n';
+  } else if (transceiver.rtpReceiver) {
+    sdp += 'a=recvonly\r\n';
+  } else {
+    sdp += 'a=inactive\r\n';
+  }
+
+  if (transceiver.rtpSender) {
+    var trackId = transceiver.rtpSender._initialTrackId || transceiver.rtpSender.track.id;
+    transceiver.rtpSender._initialTrackId = trackId; // spec.
+
+    var msid = 'msid:' + (stream ? stream.id : '-') + ' ' + trackId + '\r\n';
+    sdp += 'a=' + msid; // for Chrome. Legacy should no longer be required.
+
+    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc + ' ' + msid; // RTX
+
+    if (transceiver.sendEncodingParameters[0].rtx) {
+      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc + ' ' + msid;
+      sdp += 'a=ssrc-group:FID ' + transceiver.sendEncodingParameters[0].ssrc + ' ' + transceiver.sendEncodingParameters[0].rtx.ssrc + '\r\n';
+    }
+  } // FIXME: this should be written by writeRtpDescription.
+
+
+  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc + ' cname:' + SDPUtils.localCName + '\r\n';
+
+  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
+    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc + ' cname:' + SDPUtils.localCName + '\r\n';
+  }
+
+  return sdp;
+} // Edge does not like
+// 1) stun: filtered after 14393 unless ?transport=udp is present
+// 2) turn: that does not have all of turn:host:port?transport=udp
+// 3) turn: with ipv6 addresses
+// 4) turn: occurring muliple times
+
+
+function filterIceServers(iceServers, edgeVersion) {
+  var hasTurn = false;
+  iceServers = JSON.parse(JSON.stringify(iceServers));
+  return iceServers.filter(function (server) {
+    if (server && (server.urls || server.url)) {
+      var urls = server.urls || server.url;
+
+      if (server.url && !server.urls) {
+        console.warn('RTCIceServer.url is deprecated! Use urls instead.');
+      }
+
+      var isString = typeof urls === 'string';
+
+      if (isString) {
+        urls = [urls];
+      }
+
+      urls = urls.filter(function (url) {
+        var validTurn = url.indexOf('turn:') === 0 && url.indexOf('transport=udp') !== -1 && url.indexOf('turn:[') === -1 && !hasTurn;
+
+        if (validTurn) {
+          hasTurn = true;
+          return true;
+        }
+
+        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 && url.indexOf('?transport=udp') === -1;
+      });
+      delete server.url;
+      server.urls = isString ? urls[0] : urls;
+      return !!urls.length;
+    }
+  });
+} // Determines the intersection of local and remote capabilities.
+
+
+function getCommonCapabilities(localCapabilities, remoteCapabilities) {
+  var commonCapabilities = {
+    codecs: [],
+    headerExtensions: [],
+    fecMechanisms: []
+  };
+
+  var findCodecByPayloadType = function (pt, codecs) {
+    pt = parseInt(pt, 10);
+
+    for (var i = 0; i < codecs.length; i++) {
+      if (codecs[i].payloadType === pt || codecs[i].preferredPayloadType === pt) {
+        return codecs[i];
+      }
+    }
+  };
+
+  var rtxCapabilityMatches = function (lRtx, rRtx, lCodecs, rCodecs) {
+    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);
+    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);
+    return lCodec && rCodec && lCodec.name.toLowerCase() === rCodec.name.toLowerCase();
+  };
+
+  localCapabilities.codecs.forEach(function (lCodec) {
+    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {
+      var rCodec = remoteCapabilities.codecs[i];
+
+      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() && lCodec.clockRate === rCodec.clockRate) {
+        if (lCodec.name.toLowerCase() === 'rtx' && lCodec.parameters && rCodec.parameters.apt) {
+          // for RTX we need to find the local rtx that has a apt
+          // which points to the same local codec as the remote one.
+          if (!rtxCapabilityMatches(lCodec, rCodec, localCapabilities.codecs, remoteCapabilities.codecs)) {
+            continue;
+          }
+        }
+
+        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy
+        // number of channels is the highest common number of channels
+
+        rCodec.numChannels = Math.min(lCodec.numChannels, rCodec.numChannels); // push rCodec so we reply with offerer payload type
+
+        commonCapabilities.codecs.push(rCodec); // determine common feedback mechanisms
+
+        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function (fb) {
+          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {
+            if (lCodec.rtcpFeedback[j].type === fb.type && lCodec.rtcpFeedback[j].parameter === fb.parameter) {
+              return true;
+            }
+          }
+
+          return false;
+        }); // FIXME: also need to determine .parameters
+        //  see https://github.com/openpeer/ortc/issues/569
+
+        break;
+      }
+    }
+  });
+  localCapabilities.headerExtensions.forEach(function (lHeaderExtension) {
+    for (var i = 0; i < remoteCapabilities.headerExtensions.length; i++) {
+      var rHeaderExtension = remoteCapabilities.headerExtensions[i];
+
+      if (lHeaderExtension.uri === rHeaderExtension.uri) {
+        commonCapabilities.headerExtensions.push(rHeaderExtension);
+        break;
+      }
+    }
+  }); // FIXME: fecMechanisms
+
+  return commonCapabilities;
+} // is action=setLocalDescription with type allowed in signalingState
+
+
+function isActionAllowedInSignalingState(action, type, signalingState) {
+  return {
+    offer: {
+      setLocalDescription: ['stable', 'have-local-offer'],
+      setRemoteDescription: ['stable', 'have-remote-offer']
+    },
+    answer: {
+      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],
+      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']
+    }
+  }[type][action].indexOf(signalingState) !== -1;
+}
+
+function maybeAddCandidate(iceTransport, candidate) {
+  // Edge's internal representation adds some fields therefore
+  // not all fieldѕ are taken into account.
+  var alreadyAdded = iceTransport.getRemoteCandidates().find(function (remoteCandidate) {
+    return candidate.foundation === remoteCandidate.foundation && candidate.ip === remoteCandidate.ip && candidate.port === remoteCandidate.port && candidate.priority === remoteCandidate.priority && candidate.protocol === remoteCandidate.protocol && candidate.type === remoteCandidate.type;
+  });
+
+  if (!alreadyAdded) {
+    iceTransport.addRemoteCandidate(candidate);
+  }
+
+  return !alreadyAdded;
+}
+
+function makeError(name, description) {
+  var e = new Error(description);
+  e.name = name; // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names
+
+  e.code = {
+    NotSupportedError: 9,
+    InvalidStateError: 11,
+    InvalidAccessError: 15,
+    TypeError: undefined,
+    OperationError: undefined
+  }[name];
+  return e;
+}
+
+module.exports = function (window, edgeVersion) {
+  // https://w3c.github.io/mediacapture-main/#mediastream
+  // Helper function to add the track to the stream and
+  // dispatch the event ourselves.
+  function addTrackToStreamAndFireEvent(track, stream) {
+    stream.addTrack(track);
+    stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack', {
+      track: track
+    }));
+  }
+
+  function removeTrackFromStreamAndFireEvent(track, stream) {
+    stream.removeTrack(track);
+    stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack', {
+      track: track
+    }));
+  }
+
+  function fireAddTrack(pc, track, receiver, streams) {
+    var trackEvent = new Event('track');
+    trackEvent.track = track;
+    trackEvent.receiver = receiver;
+    trackEvent.transceiver = {
+      receiver: receiver
+    };
+    trackEvent.streams = streams;
+    window.setTimeout(function () {
+      pc._dispatchEvent('track', trackEvent);
+    });
+  }
+
+  var RTCPeerConnection = function (config) {
+    var pc = this;
+
+    var _eventTarget = document.createDocumentFragment();
+
+    ['addEventListener', 'removeEventListener', 'dispatchEvent'].forEach(function (method) {
+      pc[method] = _eventTarget[method].bind(_eventTarget);
+    });
+    this.canTrickleIceCandidates = null;
+    this.needNegotiation = false;
+    this.localStreams = [];
+    this.remoteStreams = [];
+    this._localDescription = null;
+    this._remoteDescription = null;
+    this.signalingState = 'stable';
+    this.iceConnectionState = 'new';
+    this.connectionState = 'new';
+    this.iceGatheringState = 'new';
+    config = JSON.parse(JSON.stringify(config || {}));
+    this.usingBundle = config.bundlePolicy === 'max-bundle';
+
+    if (config.rtcpMuxPolicy === 'negotiate') {
+      throw makeError('NotSupportedError', 'rtcpMuxPolicy \'negotiate\' is not supported');
+    } else if (!config.rtcpMuxPolicy) {
+      config.rtcpMuxPolicy = 'require';
+    }
+
+    switch (config.iceTransportPolicy) {
+      case 'all':
+      case 'relay':
+        break;
+
+      default:
+        config.iceTransportPolicy = 'all';
+        break;
+    }
+
+    switch (config.bundlePolicy) {
+      case 'balanced':
+      case 'max-compat':
+      case 'max-bundle':
+        break;
+
+      default:
+        config.bundlePolicy = 'balanced';
+        break;
+    }
+
+    config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);
+    this._iceGatherers = [];
+
+    if (config.iceCandidatePoolSize) {
+      for (var i = config.iceCandidatePoolSize; i > 0; i--) {
+        this._iceGatherers.push(new window.RTCIceGatherer({
+          iceServers: config.iceServers,
+          gatherPolicy: config.iceTransportPolicy
+        }));
+      }
+    } else {
+      config.iceCandidatePoolSize = 0;
+    }
+
+    this._config = config; // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...
+    // everything that is needed to describe a SDP m-line.
+
+    this.transceivers = [];
+    this._sdpSessionId = SDPUtils.generateSessionId();
+    this._sdpSessionVersion = 0;
+    this._dtlsRole = undefined; // role for a=setup to use in answers.
+
+    this._isClosed = false;
+  };
+
+  Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {
+    configurable: true,
+    get: function () {
+      return this._localDescription;
+    }
+  });
+  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {
+    configurable: true,
+    get: function () {
+      return this._remoteDescription;
+    }
+  }); // set up event handlers on prototype
+
+  RTCPeerConnection.prototype.onicecandidate = null;
+  RTCPeerConnection.prototype.onaddstream = null;
+  RTCPeerConnection.prototype.ontrack = null;
+  RTCPeerConnection.prototype.onremovestream = null;
+  RTCPeerConnection.prototype.onsignalingstatechange = null;
+  RTCPeerConnection.prototype.oniceconnectionstatechange = null;
+  RTCPeerConnection.prototype.onconnectionstatechange = null;
+  RTCPeerConnection.prototype.onicegatheringstatechange = null;
+  RTCPeerConnection.prototype.onnegotiationneeded = null;
+  RTCPeerConnection.prototype.ondatachannel = null;
+
+  RTCPeerConnection.prototype._dispatchEvent = function (name, event) {
+    if (this._isClosed) {
+      return;
+    }
+
+    this.dispatchEvent(event);
+
+    if (typeof this['on' + name] === 'function') {
+      this['on' + name](event);
+    }
+  };
+
+  RTCPeerConnection.prototype._emitGatheringStateChange = function () {
+    var event = new Event('icegatheringstatechange');
+
+    this._dispatchEvent('icegatheringstatechange', event);
+  };
+
+  RTCPeerConnection.prototype.getConfiguration = function () {
+    return this._config;
+  };
+
+  RTCPeerConnection.prototype.getLocalStreams = function () {
+    return this.localStreams;
+  };
+
+  RTCPeerConnection.prototype.getRemoteStreams = function () {
+    return this.remoteStreams;
+  }; // internal helper to create a transceiver object.
+  // (which is not yet the same as the WebRTC 1.0 transceiver)
+
+
+  RTCPeerConnection.prototype._createTransceiver = function (kind, doNotAdd) {
+    var hasBundleTransport = this.transceivers.length > 0;
+    var transceiver = {
+      track: null,
+      iceGatherer: null,
+      iceTransport: null,
+      dtlsTransport: null,
+      localCapabilities: null,
+      remoteCapabilities: null,
+      rtpSender: null,
+      rtpReceiver: null,
+      kind: kind,
+      mid: null,
+      sendEncodingParameters: null,
+      recvEncodingParameters: null,
+      stream: null,
+      associatedRemoteMediaStreams: [],
+      wantReceive: true
+    };
+
+    if (this.usingBundle && hasBundleTransport) {
+      transceiver.iceTransport = this.transceivers[0].iceTransport;
+      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;
+    } else {
+      var transports = this._createIceAndDtlsTransports();
+
+      transceiver.iceTransport = transports.iceTransport;
+      transceiver.dtlsTransport = transports.dtlsTransport;
+    }
+
+    if (!doNotAdd) {
+      this.transceivers.push(transceiver);
+    }
+
+    return transceiver;
+  };
+
+  RTCPeerConnection.prototype.addTrack = function (track, stream) {
+    if (this._isClosed) {
+      throw makeError('InvalidStateError', 'Attempted to call addTrack on a closed peerconnection.');
+    }
+
+    var alreadyExists = this.transceivers.find(function (s) {
+      return s.track === track;
+    });
+
+    if (alreadyExists) {
+      throw makeError('InvalidAccessError', 'Track already exists.');
+    }
+
+    var transceiver;
+
+    for (var i = 0; i < this.transceivers.length; i++) {
+      if (!this.transceivers[i].track && this.transceivers[i].kind === track.kind) {
+        transceiver = this.transceivers[i];
+      }
+    }
+
+    if (!transceiver) {
+      transceiver = this._createTransceiver(track.kind);
+    }
+
+    this._maybeFireNegotiationNeeded();
+
+    if (this.localStreams.indexOf(stream) === -1) {
+      this.localStreams.push(stream);
+    }
+
+    transceiver.track = track;
+    transceiver.stream = stream;
+    transceiver.rtpSender = new window.RTCRtpSender(track, transceiver.dtlsTransport);
+    return transceiver.rtpSender;
+  };
+
+  RTCPeerConnection.prototype.addStream = function (stream) {
+    var pc = this;
+
+    if (edgeVersion >= 15025) {
+      stream.getTracks().forEach(function (track) {
+        pc.addTrack(track, stream);
+      });
+    } else {
+      // Clone is necessary for local demos mostly, attaching directly
+      // to two different senders does not work (build 10547).
+      // Fixed in 15025 (or earlier)
+      var clonedStream = stream.clone();
+      stream.getTracks().forEach(function (track, idx) {
+        var clonedTrack = clonedStream.getTracks()[idx];
+        track.addEventListener('enabled', function (event) {
+          clonedTrack.enabled = event.enabled;
+        });
+      });
+      clonedStream.getTracks().forEach(function (track) {
+        pc.addTrack(track, clonedStream);
+      });
+    }
+  };
+
+  RTCPeerConnection.prototype.removeTrack = function (sender) {
+    if (this._isClosed) {
+      throw makeError('InvalidStateError', 'Attempted to call removeTrack on a closed peerconnection.');
+    }
+
+    if (!(sender instanceof window.RTCRtpSender)) {
+      throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' + 'does not implement interface RTCRtpSender.');
+    }
+
+    var transceiver = this.transceivers.find(function (t) {
+      return t.rtpSender === sender;
+    });
+
+    if (!transceiver) {
+      throw makeError('InvalidAccessError', 'Sender was not created by this connection.');
+    }
+
+    var stream = transceiver.stream;
+    transceiver.rtpSender.stop();
+    transceiver.rtpSender = null;
+    transceiver.track = null;
+    transceiver.stream = null; // remove the stream from the set of local streams
+
+    var localStreams = this.transceivers.map(function (t) {
+      return t.stream;
+    });
+
+    if (localStreams.indexOf(stream) === -1 && this.localStreams.indexOf(stream) > -1) {
+      this.localStreams.splice(this.localStreams.indexOf(stream), 1);
+    }
+
+    this._maybeFireNegotiationNeeded();
+  };
+
+  RTCPeerConnection.prototype.removeStream = function (stream) {
+    var pc = this;
+    stream.getTracks().forEach(function (track) {
+      var sender = pc.getSenders().find(function (s) {
+        return s.track === track;
+      });
+
+      if (sender) {
+        pc.removeTrack(sender);
+      }
+    });
+  };
+
+  RTCPeerConnection.prototype.getSenders = function () {
+    return this.transceivers.filter(function (transceiver) {
+      return !!transceiver.rtpSender;
+    }).map(function (transceiver) {
+      return transceiver.rtpSender;
+    });
+  };
+
+  RTCPeerConnection.prototype.getReceivers = function () {
+    return this.transceivers.filter(function (transceiver) {
+      return !!transceiver.rtpReceiver;
+    }).map(function (transceiver) {
+      return transceiver.rtpReceiver;
+    });
+  };
+
+  RTCPeerConnection.prototype._createIceGatherer = function (sdpMLineIndex, usingBundle) {
+    var pc = this;
+
+    if (usingBundle && sdpMLineIndex > 0) {
+      return this.transceivers[0].iceGatherer;
+    } else if (this._iceGatherers.length) {
+      return this._iceGatherers.shift();
+    }
+
+    var iceGatherer = new window.RTCIceGatherer({
+      iceServers: this._config.iceServers,
+      gatherPolicy: this._config.iceTransportPolicy
+    });
+    Object.defineProperty(iceGatherer, 'state', {
+      value: 'new',
+      writable: true
+    });
+    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];
+
+    this.transceivers[sdpMLineIndex].bufferCandidates = function (event) {
+      var end = !event.candidate || Object.keys(event.candidate).length === 0; // polyfill since RTCIceGatherer.state is not implemented in
+      // Edge 10547 yet.
+
+      iceGatherer.state = end ? 'completed' : 'gathering';
+
+      if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {
+        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);
+      }
+    };
+
+    iceGatherer.addEventListener('localcandidate', this.transceivers[sdpMLineIndex].bufferCandidates);
+    return iceGatherer;
+  }; // start gathering from an RTCIceGatherer.
+
+
+  RTCPeerConnection.prototype._gather = function (mid, sdpMLineIndex) {
+    var pc = this;
+    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
+
+    if (iceGatherer.onlocalcandidate) {
+      return;
+    }
+
+    var bufferedCandidateEvents = this.transceivers[sdpMLineIndex].bufferedCandidateEvents;
+    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;
+    iceGatherer.removeEventListener('localcandidate', this.transceivers[sdpMLineIndex].bufferCandidates);
+
+    iceGatherer.onlocalcandidate = function (evt) {
+      if (pc.usingBundle && sdpMLineIndex > 0) {
+        // if we know that we use bundle we can drop candidates with
+        // ѕdpMLineIndex > 0. If we don't do this then our state gets
+        // confused since we dispose the extra ice gatherer.
+        return;
+      }
+
+      var event = new Event('icecandidate');
+      event.candidate = {
+        sdpMid: mid,
+        sdpMLineIndex: sdpMLineIndex
+      };
+      var cand = evt.candidate; // Edge emits an empty object for RTCIceCandidateComplete‥
+
+      var end = !cand || Object.keys(cand).length === 0;
+
+      if (end) {
+        // polyfill since RTCIceGatherer.state is not implemented in
+        // Edge 10547 yet.
+        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {
+          iceGatherer.state = 'completed';
+        }
+      } else {
+        if (iceGatherer.state === 'new') {
+          iceGatherer.state = 'gathering';
+        } // RTCIceCandidate doesn't have a component, needs to be added
+
+
+        cand.component = 1; // also the usernameFragment. TODO: update SDP to take both variants.
+
+        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;
+        var serializedCandidate = SDPUtils.writeCandidate(cand);
+        event.candidate = Object.assign(event.candidate, SDPUtils.parseCandidate(serializedCandidate));
+        event.candidate.candidate = serializedCandidate;
+
+        event.candidate.toJSON = function () {
+          return {
+            candidate: event.candidate.candidate,
+            sdpMid: event.candidate.sdpMid,
+            sdpMLineIndex: event.candidate.sdpMLineIndex,
+            usernameFragment: event.candidate.usernameFragment
+          };
+        };
+      } // update local description.
+
+
+      var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);
+
+      if (!end) {
+        sections[event.candidate.sdpMLineIndex] += 'a=' + event.candidate.candidate + '\r\n';
+      } else {
+        sections[event.candidate.sdpMLineIndex] += 'a=end-of-candidates\r\n';
+      }
+
+      pc._localDescription.sdp = SDPUtils.getDescription(pc._localDescription.sdp) + sections.join('');
+      var complete = pc.transceivers.every(function (transceiver) {
+        return transceiver.iceGatherer && transceiver.iceGatherer.state === 'completed';
+      });
+
+      if (pc.iceGatheringState !== 'gathering') {
+        pc.iceGatheringState = 'gathering';
+
+        pc._emitGatheringStateChange();
+      } // Emit candidate. Also emit null candidate when all gatherers are
+      // complete.
+
+
+      if (!end) {
+        pc._dispatchEvent('icecandidate', event);
+      }
+
+      if (complete) {
+        pc._dispatchEvent('icecandidate', new Event('icecandidate'));
+
+        pc.iceGatheringState = 'complete';
+
+        pc._emitGatheringStateChange();
+      }
+    }; // emit already gathered candidates.
+
+
+    window.setTimeout(function () {
+      bufferedCandidateEvents.forEach(function (e) {
+        iceGatherer.onlocalcandidate(e);
+      });
+    }, 0);
+  }; // Create ICE transport and DTLS transport.
+
+
+  RTCPeerConnection.prototype._createIceAndDtlsTransports = function () {
+    var pc = this;
+    var iceTransport = new window.RTCIceTransport(null);
+
+    iceTransport.onicestatechange = function () {
+      pc._updateIceConnectionState();
+
+      pc._updateConnectionState();
+    };
+
+    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);
+
+    dtlsTransport.ondtlsstatechange = function () {
+      pc._updateConnectionState();
+    };
+
+    dtlsTransport.onerror = function () {
+      // onerror does not set state to failed by itself.
+      Object.defineProperty(dtlsTransport, 'state', {
+        value: 'failed',
+        writable: true
+      });
+
+      pc._updateConnectionState();
+    };
+
+    return {
+      iceTransport: iceTransport,
+      dtlsTransport: dtlsTransport
+    };
+  }; // Destroy ICE gatherer, ICE transport and DTLS transport.
+  // Without triggering the callbacks.
+
+
+  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function (sdpMLineIndex) {
+    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
+
+    if (iceGatherer) {
+      delete iceGatherer.onlocalcandidate;
+      delete this.transceivers[sdpMLineIndex].iceGatherer;
+    }
+
+    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;
+
+    if (iceTransport) {
+      delete iceTransport.onicestatechange;
+      delete this.transceivers[sdpMLineIndex].iceTransport;
+    }
+
+    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;
+
+    if (dtlsTransport) {
+      delete dtlsTransport.ondtlsstatechange;
+      delete dtlsTransport.onerror;
+      delete this.transceivers[sdpMLineIndex].dtlsTransport;
+    }
+  }; // Start the RTP Sender and Receiver for a transceiver.
+
+
+  RTCPeerConnection.prototype._transceive = function (transceiver, send, recv) {
+    var params = getCommonCapabilities(transceiver.localCapabilities, transceiver.remoteCapabilities);
+
+    if (send && transceiver.rtpSender) {
+      params.encodings = transceiver.sendEncodingParameters;
+      params.rtcp = {
+        cname: SDPUtils.localCName,
+        compound: transceiver.rtcpParameters.compound
+      };
+
+      if (transceiver.recvEncodingParameters.length) {
+        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;
+      }
+
+      transceiver.rtpSender.send(params);
+    }
+
+    if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {
+      // remove RTX field in Edge 14942
+      if (transceiver.kind === 'video' && transceiver.recvEncodingParameters && edgeVersion < 15019) {
+        transceiver.recvEncodingParameters.forEach(function (p) {
+          delete p.rtx;
+        });
+      }
+
+      if (transceiver.recvEncodingParameters.length) {
+        params.encodings = transceiver.recvEncodingParameters;
+      } else {
+        params.encodings = [{}];
+      }
+
+      params.rtcp = {
+        compound: transceiver.rtcpParameters.compound
+      };
+
+      if (transceiver.rtcpParameters.cname) {
+        params.rtcp.cname = transceiver.rtcpParameters.cname;
+      }
+
+      if (transceiver.sendEncodingParameters.length) {
+        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;
+      }
+
+      transceiver.rtpReceiver.receive(params);
+    }
+  };
+
+  RTCPeerConnection.prototype.setLocalDescription = function (description) {
+    var pc = this; // Note: pranswer is not supported.
+
+    if (['offer', 'answer'].indexOf(description.type) === -1) {
+      return Promise.reject(makeError('TypeError', 'Unsupported type "' + description.type + '"'));
+    }
+
+    if (!isActionAllowedInSignalingState('setLocalDescription', description.type, pc.signalingState) || pc._isClosed) {
+      return Promise.reject(makeError('InvalidStateError', 'Can not set local ' + description.type + ' in state ' + pc.signalingState));
+    }
+
+    var sections;
+    var sessionpart;
+
+    if (description.type === 'offer') {
+      // VERY limited support for SDP munging. Limited to:
+      // * changing the order of codecs
+      sections = SDPUtils.splitSections(description.sdp);
+      sessionpart = sections.shift();
+      sections.forEach(function (mediaSection, sdpMLineIndex) {
+        var caps = SDPUtils.parseRtpParameters(mediaSection);
+        pc.transceivers[sdpMLineIndex].localCapabilities = caps;
+      });
+      pc.transceivers.forEach(function (transceiver, sdpMLineIndex) {
+        pc._gather(transceiver.mid, sdpMLineIndex);
+      });
+    } else if (description.type === 'answer') {
+      sections = SDPUtils.splitSections(pc._remoteDescription.sdp);
+      sessionpart = sections.shift();
+      var isIceLite = SDPUtils.matchPrefix(sessionpart, 'a=ice-lite').length > 0;
+      sections.forEach(function (mediaSection, sdpMLineIndex) {
+        var transceiver = pc.transceivers[sdpMLineIndex];
+        var iceGatherer = transceiver.iceGatherer;
+        var iceTransport = transceiver.iceTransport;
+        var dtlsTransport = transceiver.dtlsTransport;
+        var localCapabilities = transceiver.localCapabilities;
+        var remoteCapabilities = transceiver.remoteCapabilities; // treat bundle-only as not-rejected.
+
+        var rejected = SDPUtils.isRejected(mediaSection) && SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
+
+        if (!rejected && !transceiver.rejected) {
+          var remoteIceParameters = SDPUtils.getIceParameters(mediaSection, sessionpart);
+          var remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection, sessionpart);
+
+          if (isIceLite) {
+            remoteDtlsParameters.role = 'server';
+          }
+
+          if (!pc.usingBundle || sdpMLineIndex === 0) {
+            pc._gather(transceiver.mid, sdpMLineIndex);
+
+            if (iceTransport.state === 'new') {
+              iceTransport.start(iceGatherer, remoteIceParameters, isIceLite ? 'controlling' : 'controlled');
+            }
+
+            if (dtlsTransport.state === 'new') {
+              dtlsTransport.start(remoteDtlsParameters);
+            }
+          } // Calculate intersection of capabilities.
+
+
+          var params = getCommonCapabilities(localCapabilities, remoteCapabilities); // Start the RTCRtpSender. The RTCRtpReceiver for this
+          // transceiver has already been started in setRemoteDescription.
+
+          pc._transceive(transceiver, params.codecs.length > 0, false);
+        }
+      });
+    }
+
+    pc._localDescription = {
+      type: description.type,
+      sdp: description.sdp
+    };
+
+    if (description.type === 'offer') {
+      pc._updateSignalingState('have-local-offer');
+    } else {
+      pc._updateSignalingState('stable');
+    }
+
+    return Promise.resolve();
+  };
+
+  RTCPeerConnection.prototype.setRemoteDescription = function (description) {
+    var pc = this; // Note: pranswer is not supported.
+
+    if (['offer', 'answer'].indexOf(description.type) === -1) {
+      return Promise.reject(makeError('TypeError', 'Unsupported type "' + description.type + '"'));
+    }
+
+    if (!isActionAllowedInSignalingState('setRemoteDescription', description.type, pc.signalingState) || pc._isClosed) {
+      return Promise.reject(makeError('InvalidStateError', 'Can not set remote ' + description.type + ' in state ' + pc.signalingState));
+    }
+
+    var streams = {};
+    pc.remoteStreams.forEach(function (stream) {
+      streams[stream.id] = stream;
+    });
+    var receiverList = [];
+    var sections = SDPUtils.splitSections(description.sdp);
+    var sessionpart = sections.shift();
+    var isIceLite = SDPUtils.matchPrefix(sessionpart, 'a=ice-lite').length > 0;
+    var usingBundle = SDPUtils.matchPrefix(sessionpart, 'a=group:BUNDLE ').length > 0;
+    pc.usingBundle = usingBundle;
+    var iceOptions = SDPUtils.matchPrefix(sessionpart, 'a=ice-options:')[0];
+
+    if (iceOptions) {
+      pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ').indexOf('trickle') >= 0;
+    } else {
+      pc.canTrickleIceCandidates = false;
+    }
+
+    sections.forEach(function (mediaSection, sdpMLineIndex) {
+      var lines = SDPUtils.splitLines(mediaSection);
+      var kind = SDPUtils.getKind(mediaSection); // treat bundle-only as not-rejected.
+
+      var rejected = SDPUtils.isRejected(mediaSection) && SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
+      var protocol = lines[0].substr(2).split(' ')[2];
+      var direction = SDPUtils.getDirection(mediaSection, sessionpart);
+      var remoteMsid = SDPUtils.parseMsid(mediaSection);
+      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier(); // Reject datachannels which are not implemented yet.
+
+      if (rejected || kind === 'application' && (protocol === 'DTLS/SCTP' || protocol === 'UDP/DTLS/SCTP')) {
+        // TODO: this is dangerous in the case where a non-rejected m-line
+        //     becomes rejected.
+        pc.transceivers[sdpMLineIndex] = {
+          mid: mid,
+          kind: kind,
+          protocol: protocol,
+          rejected: true
+        };
+        return;
+      }
+
+      if (!rejected && pc.transceivers[sdpMLineIndex] && pc.transceivers[sdpMLineIndex].rejected) {
+        // recycle a rejected transceiver.
+        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);
+      }
+
+      var transceiver;
+      var iceGatherer;
+      var iceTransport;
+      var dtlsTransport;
+      var rtpReceiver;
+      var sendEncodingParameters;
+      var recvEncodingParameters;
+      var localCapabilities;
+      var track; // FIXME: ensure the mediaSection has rtcp-mux set.
+
+      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
+      var remoteIceParameters;
+      var remoteDtlsParameters;
+
+      if (!rejected) {
+        remoteIceParameters = SDPUtils.getIceParameters(mediaSection, sessionpart);
+        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection, sessionpart);
+        remoteDtlsParameters.role = 'client';
+      }
+
+      recvEncodingParameters = SDPUtils.parseRtpEncodingParameters(mediaSection);
+      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);
+      var isComplete = SDPUtils.matchPrefix(mediaSection, 'a=end-of-candidates', sessionpart).length > 0;
+      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:').map(function (cand) {
+        return SDPUtils.parseCandidate(cand);
+      }).filter(function (cand) {
+        return cand.component === 1;
+      }); // Check if we can use BUNDLE and dispose transports.
+
+      if ((description.type === 'offer' || description.type === 'answer') && !rejected && usingBundle && sdpMLineIndex > 0 && pc.transceivers[sdpMLineIndex]) {
+        pc._disposeIceAndDtlsTransports(sdpMLineIndex);
+
+        pc.transceivers[sdpMLineIndex].iceGatherer = pc.transceivers[0].iceGatherer;
+        pc.transceivers[sdpMLineIndex].iceTransport = pc.transceivers[0].iceTransport;
+        pc.transceivers[sdpMLineIndex].dtlsTransport = pc.transceivers[0].dtlsTransport;
+
+        if (pc.transceivers[sdpMLineIndex].rtpSender) {
+          pc.transceivers[sdpMLineIndex].rtpSender.setTransport(pc.transceivers[0].dtlsTransport);
+        }
+
+        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {
+          pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(pc.transceivers[0].dtlsTransport);
+        }
+      }
+
+      if (description.type === 'offer' && !rejected) {
+        transceiver = pc.transceivers[sdpMLineIndex] || pc._createTransceiver(kind);
+        transceiver.mid = mid;
+
+        if (!transceiver.iceGatherer) {
+          transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex, usingBundle);
+        }
+
+        if (cands.length && transceiver.iceTransport.state === 'new') {
+          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {
+            transceiver.iceTransport.setRemoteCandidates(cands);
+          } else {
+            cands.forEach(function (candidate) {
+              maybeAddCandidate(transceiver.iceTransport, candidate);
+            });
+          }
+        }
+
+        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind); // filter RTX until additional stuff needed for RTX is implemented
+        // in adapter.js
+
+        if (edgeVersion < 15019) {
+          localCapabilities.codecs = localCapabilities.codecs.filter(function (codec) {
+            return codec.name !== 'rtx';
+          });
+        }
+
+        sendEncodingParameters = transceiver.sendEncodingParameters || [{
+          ssrc: (2 * sdpMLineIndex + 2) * 1001
+        }]; // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
+
+        var isNewTrack = false;
+
+        if (direction === 'sendrecv' || direction === 'sendonly') {
+          isNewTrack = !transceiver.rtpReceiver;
+          rtpReceiver = transceiver.rtpReceiver || new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);
+
+          if (isNewTrack) {
+            var stream;
+            track = rtpReceiver.track; // FIXME: does not work with Plan B.
+
+            if (remoteMsid && remoteMsid.stream === '-') {// no-op. a stream id of '-' means: no associated stream.
+            } else if (remoteMsid) {
+              if (!streams[remoteMsid.stream]) {
+                streams[remoteMsid.stream] = new window.MediaStream();
+                Object.defineProperty(streams[remoteMsid.stream], 'id', {
+                  get: function () {
+                    return remoteMsid.stream;
+                  }
+                });
+              }
+
+              Object.defineProperty(track, 'id', {
+                get: function () {
+                  return remoteMsid.track;
+                }
+              });
+              stream = streams[remoteMsid.stream];
+            } else {
+              if (!streams.default) {
+                streams.default = new window.MediaStream();
+              }
+
+              stream = streams.default;
+            }
+
+            if (stream) {
+              addTrackToStreamAndFireEvent(track, stream);
+              transceiver.associatedRemoteMediaStreams.push(stream);
+            }
+
+            receiverList.push([track, rtpReceiver, stream]);
+          }
+        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {
+          transceiver.associatedRemoteMediaStreams.forEach(function (s) {
+            var nativeTrack = s.getTracks().find(function (t) {
+              return t.id === transceiver.rtpReceiver.track.id;
+            });
+
+            if (nativeTrack) {
+              removeTrackFromStreamAndFireEvent(nativeTrack, s);
+            }
+          });
+          transceiver.associatedRemoteMediaStreams = [];
+        }
+
+        transceiver.localCapabilities = localCapabilities;
+        transceiver.remoteCapabilities = remoteCapabilities;
+        transceiver.rtpReceiver = rtpReceiver;
+        transceiver.rtcpParameters = rtcpParameters;
+        transceiver.sendEncodingParameters = sendEncodingParameters;
+        transceiver.recvEncodingParameters = recvEncodingParameters; // Start the RTCRtpReceiver now. The RTPSender is started in
+        // setLocalDescription.
+
+        pc._transceive(pc.transceivers[sdpMLineIndex], false, isNewTrack);
+      } else if (description.type === 'answer' && !rejected) {
+        transceiver = pc.transceivers[sdpMLineIndex];
+        iceGatherer = transceiver.iceGatherer;
+        iceTransport = transceiver.iceTransport;
+        dtlsTransport = transceiver.dtlsTransport;
+        rtpReceiver = transceiver.rtpReceiver;
+        sendEncodingParameters = transceiver.sendEncodingParameters;
+        localCapabilities = transceiver.localCapabilities;
+        pc.transceivers[sdpMLineIndex].recvEncodingParameters = recvEncodingParameters;
+        pc.transceivers[sdpMLineIndex].remoteCapabilities = remoteCapabilities;
+        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;
+
+        if (cands.length && iceTransport.state === 'new') {
+          if ((isIceLite || isComplete) && (!usingBundle || sdpMLineIndex === 0)) {
+            iceTransport.setRemoteCandidates(cands);
+          } else {
+            cands.forEach(function (candidate) {
+              maybeAddCandidate(transceiver.iceTransport, candidate);
+            });
+          }
+        }
+
+        if (!usingBundle || sdpMLineIndex === 0) {
+          if (iceTransport.state === 'new') {
+            iceTransport.start(iceGatherer, remoteIceParameters, 'controlling');
+          }
+
+          if (dtlsTransport.state === 'new') {
+            dtlsTransport.start(remoteDtlsParameters);
+          }
+        } // If the offer contained RTX but the answer did not,
+        // remove RTX from sendEncodingParameters.
+
+
+        var commonCapabilities = getCommonCapabilities(transceiver.localCapabilities, transceiver.remoteCapabilities);
+        var hasRtx = commonCapabilities.codecs.filter(function (c) {
+          return c.name.toLowerCase() === 'rtx';
+        }).length;
+
+        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
+          delete transceiver.sendEncodingParameters[0].rtx;
+        }
+
+        pc._transceive(transceiver, direction === 'sendrecv' || direction === 'recvonly', direction === 'sendrecv' || direction === 'sendonly'); // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
+
+
+        if (rtpReceiver && (direction === 'sendrecv' || direction === 'sendonly')) {
+          track = rtpReceiver.track;
+
+          if (remoteMsid) {
+            if (!streams[remoteMsid.stream]) {
+              streams[remoteMsid.stream] = new window.MediaStream();
+            }
+
+            addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);
+            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);
+          } else {
+            if (!streams.default) {
+              streams.default = new window.MediaStream();
+            }
+
+            addTrackToStreamAndFireEvent(track, streams.default);
+            receiverList.push([track, rtpReceiver, streams.default]);
+          }
+        } else {
+          // FIXME: actually the receiver should be created later.
+          delete transceiver.rtpReceiver;
+        }
+      }
+    });
+
+    if (pc._dtlsRole === undefined) {
+      pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';
+    }
+
+    pc._remoteDescription = {
+      type: description.type,
+      sdp: description.sdp
+    };
+
+    if (description.type === 'offer') {
+      pc._updateSignalingState('have-remote-offer');
+    } else {
+      pc._updateSignalingState('stable');
+    }
+
+    Object.keys(streams).forEach(function (sid) {
+      var stream = streams[sid];
+
+      if (stream.getTracks().length) {
+        if (pc.remoteStreams.indexOf(stream) === -1) {
+          pc.remoteStreams.push(stream);
+          var event = new Event('addstream');
+          event.stream = stream;
+          window.setTimeout(function () {
+            pc._dispatchEvent('addstream', event);
+          });
+        }
+
+        receiverList.forEach(function (item) {
+          var track = item[0];
+          var receiver = item[1];
+
+          if (stream.id !== item[2].id) {
+            return;
+          }
+
+          fireAddTrack(pc, track, receiver, [stream]);
+        });
+      }
+    });
+    receiverList.forEach(function (item) {
+      if (item[2]) {
+        return;
+      }
+
+      fireAddTrack(pc, item[0], item[1], []);
+    }); // check whether addIceCandidate({}) was called within four seconds after
+    // setRemoteDescription.
+
+    window.setTimeout(function () {
+      if (!(pc && pc.transceivers)) {
+        return;
+      }
+
+      pc.transceivers.forEach(function (transceiver) {
+        if (transceiver.iceTransport && transceiver.iceTransport.state === 'new' && transceiver.iceTransport.getRemoteCandidates().length > 0) {
+          console.warn('Timeout for addRemoteCandidate. Consider sending ' + 'an end-of-candidates notification');
+          transceiver.iceTransport.addRemoteCandidate({});
+        }
+      });
+    }, 4000);
+    return Promise.resolve();
+  };
+
+  RTCPeerConnection.prototype.close = function () {
+    this.transceivers.forEach(function (transceiver) {
+      /* not yet
+      if (transceiver.iceGatherer) {
+        transceiver.iceGatherer.close();
+      }
+      */
+      if (transceiver.iceTransport) {
+        transceiver.iceTransport.stop();
+      }
+
+      if (transceiver.dtlsTransport) {
+        transceiver.dtlsTransport.stop();
+      }
+
+      if (transceiver.rtpSender) {
+        transceiver.rtpSender.stop();
+      }
+
+      if (transceiver.rtpReceiver) {
+        transceiver.rtpReceiver.stop();
+      }
+    }); // FIXME: clean up tracks, local streams, remote streams, etc
+
+    this._isClosed = true;
+
+    this._updateSignalingState('closed');
+  }; // Update the signaling state.
+
+
+  RTCPeerConnection.prototype._updateSignalingState = function (newState) {
+    this.signalingState = newState;
+    var event = new Event('signalingstatechange');
+
+    this._dispatchEvent('signalingstatechange', event);
+  }; // Determine whether to fire the negotiationneeded event.
+
+
+  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function () {
+    var pc = this;
+
+    if (this.signalingState !== 'stable' || this.needNegotiation === true) {
+      return;
+    }
+
+    this.needNegotiation = true;
+    window.setTimeout(function () {
+      if (pc.needNegotiation) {
+        pc.needNegotiation = false;
+        var event = new Event('negotiationneeded');
+
+        pc._dispatchEvent('negotiationneeded', event);
+      }
+    }, 0);
+  }; // Update the ice connection state.
+
+
+  RTCPeerConnection.prototype._updateIceConnectionState = function () {
+    var newState;
+    var states = {
+      'new': 0,
+      closed: 0,
+      checking: 0,
+      connected: 0,
+      completed: 0,
+      disconnected: 0,
+      failed: 0
+    };
+    this.transceivers.forEach(function (transceiver) {
+      if (transceiver.iceTransport && !transceiver.rejected) {
+        states[transceiver.iceTransport.state]++;
+      }
+    });
+    newState = 'new';
+
+    if (states.failed > 0) {
+      newState = 'failed';
+    } else if (states.checking > 0) {
+      newState = 'checking';
+    } else if (states.disconnected > 0) {
+      newState = 'disconnected';
+    } else if (states.new > 0) {
+      newState = 'new';
+    } else if (states.connected > 0) {
+      newState = 'connected';
+    } else if (states.completed > 0) {
+      newState = 'completed';
+    }
+
+    if (newState !== this.iceConnectionState) {
+      this.iceConnectionState = newState;
+      var event = new Event('iceconnectionstatechange');
+
+      this._dispatchEvent('iceconnectionstatechange', event);
+    }
+  }; // Update the connection state.
+
+
+  RTCPeerConnection.prototype._updateConnectionState = function () {
+    var newState;
+    var states = {
+      'new': 0,
+      closed: 0,
+      connecting: 0,
+      connected: 0,
+      completed: 0,
+      disconnected: 0,
+      failed: 0
+    };
+    this.transceivers.forEach(function (transceiver) {
+      if (transceiver.iceTransport && transceiver.dtlsTransport && !transceiver.rejected) {
+        states[transceiver.iceTransport.state]++;
+        states[transceiver.dtlsTransport.state]++;
+      }
+    }); // ICETransport.completed and connected are the same for this purpose.
+
+    states.connected += states.completed;
+    newState = 'new';
+
+    if (states.failed > 0) {
+      newState = 'failed';
+    } else if (states.connecting > 0) {
+      newState = 'connecting';
+    } else if (states.disconnected > 0) {
+      newState = 'disconnected';
+    } else if (states.new > 0) {
+      newState = 'new';
+    } else if (states.connected > 0) {
+      newState = 'connected';
+    }
+
+    if (newState !== this.connectionState) {
+      this.connectionState = newState;
+      var event = new Event('connectionstatechange');
+
+      this._dispatchEvent('connectionstatechange', event);
+    }
+  };
+
+  RTCPeerConnection.prototype.createOffer = function () {
+    var pc = this;
+
+    if (pc._isClosed) {
+      return Promise.reject(makeError('InvalidStateError', 'Can not call createOffer after close'));
+    }
+
+    var numAudioTracks = pc.transceivers.filter(function (t) {
+      return t.kind === 'audio';
+    }).length;
+    var numVideoTracks = pc.transceivers.filter(function (t) {
+      return t.kind === 'video';
+    }).length; // Determine number of audio and video tracks we need to send/recv.
+
+    var offerOptions = arguments[0];
+
+    if (offerOptions) {
+      // Reject Chrome legacy constraints.
+      if (offerOptions.mandatory || offerOptions.optional) {
+        throw new TypeError('Legacy mandatory/optional constraints not supported.');
+      }
+
+      if (offerOptions.offerToReceiveAudio !== undefined) {
+        if (offerOptions.offerToReceiveAudio === true) {
+          numAudioTracks = 1;
+        } else if (offerOptions.offerToReceiveAudio === false) {
+          numAudioTracks = 0;
+        } else {
+          numAudioTracks = offerOptions.offerToReceiveAudio;
+        }
+      }
+
+      if (offerOptions.offerToReceiveVideo !== undefined) {
+        if (offerOptions.offerToReceiveVideo === true) {
+          numVideoTracks = 1;
+        } else if (offerOptions.offerToReceiveVideo === false) {
+          numVideoTracks = 0;
+        } else {
+          numVideoTracks = offerOptions.offerToReceiveVideo;
+        }
+      }
+    }
+
+    pc.transceivers.forEach(function (transceiver) {
+      if (transceiver.kind === 'audio') {
+        numAudioTracks--;
+
+        if (numAudioTracks < 0) {
+          transceiver.wantReceive = false;
+        }
+      } else if (transceiver.kind === 'video') {
+        numVideoTracks--;
+
+        if (numVideoTracks < 0) {
+          transceiver.wantReceive = false;
+        }
+      }
+    }); // Create M-lines for recvonly streams.
+
+    while (numAudioTracks > 0 || numVideoTracks > 0) {
+      if (numAudioTracks > 0) {
+        pc._createTransceiver('audio');
+
+        numAudioTracks--;
+      }
+
+      if (numVideoTracks > 0) {
+        pc._createTransceiver('video');
+
+        numVideoTracks--;
+      }
+    }
+
+    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId, pc._sdpSessionVersion++);
+    pc.transceivers.forEach(function (transceiver, sdpMLineIndex) {
+      // For each track, create an ice gatherer, ice transport,
+      // dtls transport, potentially rtpsender and rtpreceiver.
+      var track = transceiver.track;
+      var kind = transceiver.kind;
+      var mid = transceiver.mid || SDPUtils.generateIdentifier();
+      transceiver.mid = mid;
+
+      if (!transceiver.iceGatherer) {
+        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex, pc.usingBundle);
+      }
+
+      var localCapabilities = window.RTCRtpSender.getCapabilities(kind); // filter RTX until additional stuff needed for RTX is implemented
+      // in adapter.js
+
+      if (edgeVersion < 15019) {
+        localCapabilities.codecs = localCapabilities.codecs.filter(function (codec) {
+          return codec.name !== 'rtx';
+        });
+      }
+
+      localCapabilities.codecs.forEach(function (codec) {
+        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552
+        // by adding level-asymmetry-allowed=1
+        if (codec.name === 'H264' && codec.parameters['level-asymmetry-allowed'] === undefined) {
+          codec.parameters['level-asymmetry-allowed'] = '1';
+        } // for subsequent offers, we might have to re-use the payload
+        // type of the last offer.
+
+
+        if (transceiver.remoteCapabilities && transceiver.remoteCapabilities.codecs) {
+          transceiver.remoteCapabilities.codecs.forEach(function (remoteCodec) {
+            if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() && codec.clockRate === remoteCodec.clockRate) {
+              codec.preferredPayloadType = remoteCodec.payloadType;
+            }
+          });
+        }
+      });
+      localCapabilities.headerExtensions.forEach(function (hdrExt) {
+        var remoteExtensions = transceiver.remoteCapabilities && transceiver.remoteCapabilities.headerExtensions || [];
+        remoteExtensions.forEach(function (rHdrExt) {
+          if (hdrExt.uri === rHdrExt.uri) {
+            hdrExt.id = rHdrExt.id;
+          }
+        });
+      }); // generate an ssrc now, to be used later in rtpSender.send
+
+      var sendEncodingParameters = transceiver.sendEncodingParameters || [{
+        ssrc: (2 * sdpMLineIndex + 1) * 1001
+      }];
+
+      if (track) {
+        // add RTX
+        if (edgeVersion >= 15019 && kind === 'video' && !sendEncodingParameters[0].rtx) {
+          sendEncodingParameters[0].rtx = {
+            ssrc: sendEncodingParameters[0].ssrc + 1
+          };
+        }
+      }
+
+      if (transceiver.wantReceive) {
+        transceiver.rtpReceiver = new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);
+      }
+
+      transceiver.localCapabilities = localCapabilities;
+      transceiver.sendEncodingParameters = sendEncodingParameters;
+    }); // always offer BUNDLE and dispose on return if not supported.
+
+    if (pc._config.bundlePolicy !== 'max-compat') {
+      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function (t) {
+        return t.mid;
+      }).join(' ') + '\r\n';
+    }
+
+    sdp += 'a=ice-options:trickle\r\n';
+    pc.transceivers.forEach(function (transceiver, sdpMLineIndex) {
+      sdp += writeMediaSection(transceiver, transceiver.localCapabilities, 'offer', transceiver.stream, pc._dtlsRole);
+      sdp += 'a=rtcp-rsize\r\n';
+
+      if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' && (sdpMLineIndex === 0 || !pc.usingBundle)) {
+        transceiver.iceGatherer.getLocalCandidates().forEach(function (cand) {
+          cand.component = 1;
+          sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\r\n';
+        });
+
+        if (transceiver.iceGatherer.state === 'completed') {
+          sdp += 'a=end-of-candidates\r\n';
+        }
+      }
+    });
+    var desc = new window.RTCSessionDescription({
+      type: 'offer',
+      sdp: sdp
+    });
+    return Promise.resolve(desc);
+  };
+
+  RTCPeerConnection.prototype.createAnswer = function () {
+    var pc = this;
+
+    if (pc._isClosed) {
+      return Promise.reject(makeError('InvalidStateError', 'Can not call createAnswer after close'));
+    }
+
+    if (!(pc.signalingState === 'have-remote-offer' || pc.signalingState === 'have-local-pranswer')) {
+      return Promise.reject(makeError('InvalidStateError', 'Can not call createAnswer in signalingState ' + pc.signalingState));
+    }
+
+    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId, pc._sdpSessionVersion++);
+
+    if (pc.usingBundle) {
+      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function (t) {
+        return t.mid;
+      }).join(' ') + '\r\n';
+    }
+
+    sdp += 'a=ice-options:trickle\r\n';
+    var mediaSectionsInOffer = SDPUtils.getMediaSections(pc._remoteDescription.sdp).length;
+    pc.transceivers.forEach(function (transceiver, sdpMLineIndex) {
+      if (sdpMLineIndex + 1 > mediaSectionsInOffer) {
+        return;
+      }
+
+      if (transceiver.rejected) {
+        if (transceiver.kind === 'application') {
+          if (transceiver.protocol === 'DTLS/SCTP') {
+            // legacy fmt
+            sdp += 'm=application 0 DTLS/SCTP 5000\r\n';
+          } else {
+            sdp += 'm=application 0 ' + transceiver.protocol + ' webrtc-datachannel\r\n';
+          }
+        } else if (transceiver.kind === 'audio') {
+          sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\r\n' + 'a=rtpmap:0 PCMU/8000\r\n';
+        } else if (transceiver.kind === 'video') {
+          sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\r\n' + 'a=rtpmap:120 VP8/90000\r\n';
+        }
+
+        sdp += 'c=IN IP4 0.0.0.0\r\n' + 'a=inactive\r\n' + 'a=mid:' + transceiver.mid + '\r\n';
+        return;
+      } // FIXME: look at direction.
+
+
+      if (transceiver.stream) {
+        var localTrack;
+
+        if (transceiver.kind === 'audio') {
+          localTrack = transceiver.stream.getAudioTracks()[0];
+        } else if (transceiver.kind === 'video') {
+          localTrack = transceiver.stream.getVideoTracks()[0];
+        }
+
+        if (localTrack) {
+          // add RTX
+          if (edgeVersion >= 15019 && transceiver.kind === 'video' && !transceiver.sendEncodingParameters[0].rtx) {
+            transceiver.sendEncodingParameters[0].rtx = {
+              ssrc: transceiver.sendEncodingParameters[0].ssrc + 1
+            };
+          }
+        }
+      } // Calculate intersection of capabilities.
+
+
+      var commonCapabilities = getCommonCapabilities(transceiver.localCapabilities, transceiver.remoteCapabilities);
+      var hasRtx = commonCapabilities.codecs.filter(function (c) {
+        return c.name.toLowerCase() === 'rtx';
+      }).length;
+
+      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
+        delete transceiver.sendEncodingParameters[0].rtx;
+      }
+
+      sdp += writeMediaSection(transceiver, commonCapabilities, 'answer', transceiver.stream, pc._dtlsRole);
+
+      if (transceiver.rtcpParameters && transceiver.rtcpParameters.reducedSize) {
+        sdp += 'a=rtcp-rsize\r\n';
+      }
+    });
+    var desc = new window.RTCSessionDescription({
+      type: 'answer',
+      sdp: sdp
+    });
+    return Promise.resolve(desc);
+  };
+
+  RTCPeerConnection.prototype.addIceCandidate = function (candidate) {
+    var pc = this;
+    var sections;
+
+    if (candidate && !(candidate.sdpMLineIndex !== undefined || candidate.sdpMid)) {
+      return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));
+    } // TODO: needs to go into ops queue.
+
+
+    return new Promise(function (resolve, reject) {
+      if (!pc._remoteDescription) {
+        return reject(makeError('InvalidStateError', 'Can not add ICE candidate without a remote description'));
+      } else if (!candidate || candidate.candidate === '') {
+        for (var j = 0; j < pc.transceivers.length; j++) {
+          if (pc.transceivers[j].rejected) {
+            continue;
+          }
+
+          pc.transceivers[j].iceTransport.addRemoteCandidate({});
+          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
+          sections[j] += 'a=end-of-candidates\r\n';
+          pc._remoteDescription.sdp = SDPUtils.getDescription(pc._remoteDescription.sdp) + sections.join('');
+
+          if (pc.usingBundle) {
+            break;
+          }
+        }
+      } else {
+        var sdpMLineIndex = candidate.sdpMLineIndex;
+
+        if (candidate.sdpMid) {
+          for (var i = 0; i < pc.transceivers.length; i++) {
+            if (pc.transceivers[i].mid === candidate.sdpMid) {
+              sdpMLineIndex = i;
+              break;
+            }
+          }
+        }
+
+        var transceiver = pc.transceivers[sdpMLineIndex];
+
+        if (transceiver) {
+          if (transceiver.rejected) {
+            return resolve();
+          }
+
+          var cand = Object.keys(candidate.candidate).length > 0 ? SDPUtils.parseCandidate(candidate.candidate) : {}; // Ignore Chrome's invalid candidates since Edge does not like them.
+
+          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {
+            return resolve();
+          } // Ignore RTCP candidates, we assume RTCP-MUX.
+
+
+          if (cand.component && cand.component !== 1) {
+            return resolve();
+          } // when using bundle, avoid adding candidates to the wrong
+          // ice transport. And avoid adding candidates added in the SDP.
+
+
+          if (sdpMLineIndex === 0 || sdpMLineIndex > 0 && transceiver.iceTransport !== pc.transceivers[0].iceTransport) {
+            if (!maybeAddCandidate(transceiver.iceTransport, cand)) {
+              return reject(makeError('OperationError', 'Can not add ICE candidate'));
+            }
+          } // update the remoteDescription.
+
+
+          var candidateString = candidate.candidate.trim();
+
+          if (candidateString.indexOf('a=') === 0) {
+            candidateString = candidateString.substr(2);
+          }
+
+          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
+          sections[sdpMLineIndex] += 'a=' + (cand.type ? candidateString : 'end-of-candidates') + '\r\n';
+          pc._remoteDescription.sdp = SDPUtils.getDescription(pc._remoteDescription.sdp) + sections.join('');
+        } else {
+          return reject(makeError('OperationError', 'Can not add ICE candidate'));
+        }
+      }
+
+      resolve();
+    });
+  };
+
+  RTCPeerConnection.prototype.getStats = function (selector) {
+    if (selector && selector instanceof window.MediaStreamTrack) {
+      var senderOrReceiver = null;
+      this.transceivers.forEach(function (transceiver) {
+        if (transceiver.rtpSender && transceiver.rtpSender.track === selector) {
+          senderOrReceiver = transceiver.rtpSender;
+        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track === selector) {
+          senderOrReceiver = transceiver.rtpReceiver;
+        }
+      });
+
+      if (!senderOrReceiver) {
+        throw makeError('InvalidAccessError', 'Invalid selector.');
+      }
+
+      return senderOrReceiver.getStats();
+    }
+
+    var promises = [];
+    this.transceivers.forEach(function (transceiver) {
+      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport', 'dtlsTransport'].forEach(function (method) {
+        if (transceiver[method]) {
+          promises.push(transceiver[method].getStats());
+        }
+      });
+    });
+    return Promise.all(promises).then(function (allStats) {
+      var results = new Map();
+      allStats.forEach(function (stats) {
+        stats.forEach(function (stat) {
+          results.set(stat.id, stat);
+        });
+      });
+      return results;
+    });
+  }; // fix low-level stat names and return Map instead of object.
+
+
+  var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer', 'RTCIceTransport', 'RTCDtlsTransport'];
+  ortcObjects.forEach(function (ortcObjectName) {
+    var obj = window[ortcObjectName];
+
+    if (obj && obj.prototype && obj.prototype.getStats) {
+      var nativeGetstats = obj.prototype.getStats;
+
+      obj.prototype.getStats = function () {
+        return nativeGetstats.apply(this).then(function (nativeStats) {
+          var mapStats = new Map();
+          Object.keys(nativeStats).forEach(function (id) {
+            nativeStats[id].type = fixStatsType(nativeStats[id]);
+            mapStats.set(id, nativeStats[id]);
+          });
+          return mapStats;
+        });
+      };
+    }
+  }); // legacy callback shims. Should be moved to adapter.js some days.
+
+  var methods = ['createOffer', 'createAnswer'];
+  methods.forEach(function (method) {
+    var nativeMethod = RTCPeerConnection.prototype[method];
+
+    RTCPeerConnection.prototype[method] = function () {
+      var args = arguments;
+
+      if (typeof args[0] === 'function' || typeof args[1] === 'function') {
+        // legacy
+        return nativeMethod.apply(this, [arguments[2]]).then(function (description) {
+          if (typeof args[0] === 'function') {
+            args[0].apply(null, [description]);
+          }
+        }, function (error) {
+          if (typeof args[1] === 'function') {
+            args[1].apply(null, [error]);
+          }
+        });
+      }
+
+      return nativeMethod.apply(this, arguments);
+    };
+  });
+  methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];
+  methods.forEach(function (method) {
+    var nativeMethod = RTCPeerConnection.prototype[method];
+
+    RTCPeerConnection.prototype[method] = function () {
+      var args = arguments;
+
+      if (typeof args[1] === 'function' || typeof args[2] === 'function') {
+        // legacy
+        return nativeMethod.apply(this, arguments).then(function () {
+          if (typeof args[1] === 'function') {
+            args[1].apply(null);
+          }
+        }, function (error) {
+          if (typeof args[2] === 'function') {
+            args[2].apply(null, [error]);
+          }
+        });
+      }
+
+      return nativeMethod.apply(this, arguments);
+    };
+  }); // getStats is special. It doesn't have a spec legacy method yet we support
+  // getStats(something, cb) without error callbacks.
+
+  ['getStats'].forEach(function (method) {
+    var nativeMethod = RTCPeerConnection.prototype[method];
+
+    RTCPeerConnection.prototype[method] = function () {
+      var args = arguments;
+
+      if (typeof args[1] === 'function') {
+        return nativeMethod.apply(this, arguments).then(function () {
+          if (typeof args[1] === 'function') {
+            args[1].apply(null);
+          }
+        });
+      }
+
+      return nativeMethod.apply(this, arguments);
+    };
+  });
+  return RTCPeerConnection;
+};
+},{"sdp":"YHvh"}],"YdKx":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetUserMedia = shimGetUserMedia;
+
+function shimGetUserMedia(window) {
+  var navigator = window && window.navigator;
+
+  var shimError_ = function (e) {
+    return {
+      name: {
+        PermissionDeniedError: 'NotAllowedError'
+      }[e.name] || e.name,
+      message: e.message,
+      constraint: e.constraint,
+      toString: function () {
+        return this.name;
+      }
+    };
+  }; // getUserMedia error shim.
+
+
+  var origGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
+
+  navigator.mediaDevices.getUserMedia = function (c) {
+    return origGetUserMedia(c).catch(function (e) {
+      return Promise.reject(shimError_(e));
+    });
+  };
+}
+},{}],"5P3b":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetDisplayMedia = shimGetDisplayMedia;
+
+function shimGetDisplayMedia(window) {
+  if (!('getDisplayMedia' in window.navigator)) {
+    return;
+  }
+
+  if (!window.navigator.mediaDevices) {
+    return;
+  }
+
+  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
+    return;
+  }
+
+  window.navigator.mediaDevices.getDisplayMedia = window.navigator.getDisplayMedia.bind(window.navigator);
+}
+},{}],"XRic":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimPeerConnection = shimPeerConnection;
+exports.shimReplaceTrack = shimReplaceTrack;
+Object.defineProperty(exports, "shimGetUserMedia", {
+  enumerable: true,
+  get: function () {
+    return _getusermedia.shimGetUserMedia;
+  }
+});
+Object.defineProperty(exports, "shimGetDisplayMedia", {
+  enumerable: true,
+  get: function () {
+    return _getdisplaymedia.shimGetDisplayMedia;
+  }
+});
+
+var utils = _interopRequireWildcard(require("../utils"));
+
+var _filtericeservers = require("./filtericeservers");
+
+var _rtcpeerconnectionShim = _interopRequireDefault(require("rtcpeerconnection-shim"));
+
+var _getusermedia = require("./getusermedia");
+
+var _getdisplaymedia = require("./getdisplaymedia");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+function shimPeerConnection(window) {
+  var browserDetails = utils.detectBrowser(window);
+
+  if (window.RTCIceGatherer) {
+    if (!window.RTCIceCandidate) {
+      window.RTCIceCandidate = function RTCIceCandidate(args) {
+        return args;
+      };
+    }
+
+    if (!window.RTCSessionDescription) {
+      window.RTCSessionDescription = function RTCSessionDescription(args) {
+        return args;
+      };
+    } // this adds an additional event listener to MediaStrackTrack that signals
+    // when a tracks enabled property was changed. Workaround for a bug in
+    // addStream, see below. No longer required in 15025+
+
+
+    if (browserDetails.version < 15025) {
+      var origMSTEnabled = Object.getOwnPropertyDescriptor(window.MediaStreamTrack.prototype, 'enabled');
+      Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {
+        set: function (value) {
+          origMSTEnabled.set.call(this, value);
+          var ev = new Event('enabled');
+          ev.enabled = value;
+          this.dispatchEvent(ev);
+        }
+      });
+    }
+  } // ORTC defines the DTMF sender a bit different.
+  // https://github.com/w3c/ortc/issues/714
+
+
+  if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {
+    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {
+      get: function () {
+        if (this._dtmf === undefined) {
+          if (this.track.kind === 'audio') {
+            this._dtmf = new window.RTCDtmfSender(this);
+          } else if (this.track.kind === 'video') {
+            this._dtmf = null;
+          }
+        }
+
+        return this._dtmf;
+      }
+    });
+  } // Edge currently only implements the RTCDtmfSender, not the
+  // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*
+
+
+  if (window.RTCDtmfSender && !window.RTCDTMFSender) {
+    window.RTCDTMFSender = window.RTCDtmfSender;
+  }
+
+  var RTCPeerConnectionShim = (0, _rtcpeerconnectionShim.default)(window, browserDetails.version);
+
+  window.RTCPeerConnection = function RTCPeerConnection(config) {
+    if (config && config.iceServers) {
+      config.iceServers = (0, _filtericeservers.filterIceServers)(config.iceServers, browserDetails.version);
+      utils.log('ICE servers after filtering:', config.iceServers);
+    }
+
+    return new RTCPeerConnectionShim(config);
+  };
+
+  window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;
+}
+
+function shimReplaceTrack(window) {
+  // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614
+  if (window.RTCRtpSender && !('replaceTrack' in window.RTCRtpSender.prototype)) {
+    window.RTCRtpSender.prototype.replaceTrack = window.RTCRtpSender.prototype.setTrack;
+  }
+}
+},{"../utils":"iSxC","./filtericeservers":"6NZ1","rtcpeerconnection-shim":"NJ2u","./getusermedia":"YdKx","./getdisplaymedia":"5P3b"}],"/GzS":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetUserMedia = shimGetUserMedia;
+
+var utils = _interopRequireWildcard(require("../utils"));
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function shimGetUserMedia(window) {
+  var browserDetails = utils.detectBrowser(window);
+  var navigator = window && window.navigator;
+  var MediaStreamTrack = window && window.MediaStreamTrack;
+
+  navigator.getUserMedia = function (constraints, onSuccess, onError) {
+    // Replace Firefox 44+'s deprecation warning with unprefixed version.
+    utils.deprecated('navigator.getUserMedia', 'navigator.mediaDevices.getUserMedia');
+    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
+  };
+
+  if (!(browserDetails.version > 55 && 'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {
+    var remap = function (obj, a, b) {
+      if (a in obj && !(b in obj)) {
+        obj[b] = obj[a];
+        delete obj[a];
+      }
+    };
+
+    var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
+
+    navigator.mediaDevices.getUserMedia = function (c) {
+      if (_typeof(c) === 'object' && _typeof(c.audio) === 'object') {
+        c = JSON.parse(JSON.stringify(c));
+        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');
+        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');
+      }
+
+      return nativeGetUserMedia(c);
+    };
+
+    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {
+      var nativeGetSettings = MediaStreamTrack.prototype.getSettings;
+
+      MediaStreamTrack.prototype.getSettings = function () {
+        var obj = nativeGetSettings.apply(this, arguments);
+        remap(obj, 'mozAutoGainControl', 'autoGainControl');
+        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');
+        return obj;
+      };
+    }
+
+    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {
+      var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;
+
+      MediaStreamTrack.prototype.applyConstraints = function (c) {
+        if (this.kind === 'audio' && _typeof(c) === 'object') {
+          c = JSON.parse(JSON.stringify(c));
+          remap(c, 'autoGainControl', 'mozAutoGainControl');
+          remap(c, 'noiseSuppression', 'mozNoiseSuppression');
+        }
+
+        return nativeApplyConstraints.apply(this, [c]);
+      };
+    }
+  }
+}
+},{"../utils":"iSxC"}],"UuGU":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetDisplayMedia = shimGetDisplayMedia;
+
+function shimGetDisplayMedia(window, preferredMediaSource) {
+  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
+    return;
+  }
+
+  if (!window.navigator.mediaDevices) {
+    return;
+  }
+
+  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {
+    if (!(constraints && constraints.video)) {
+      var err = new DOMException('getDisplayMedia without video ' + 'constraints is undefined');
+      err.name = 'NotFoundError'; // from https://heycam.github.io/webidl/#idl-DOMException-error-names
+
+      err.code = 8;
+      return Promise.reject(err);
+    }
+
+    if (constraints.video === true) {
+      constraints.video = {
+        mediaSource: preferredMediaSource
+      };
+    } else {
+      constraints.video.mediaSource = preferredMediaSource;
+    }
+
+    return window.navigator.mediaDevices.getUserMedia(constraints);
+  };
+}
+},{}],"Fzdr":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimOnTrack = shimOnTrack;
+exports.shimPeerConnection = shimPeerConnection;
+exports.shimSenderGetStats = shimSenderGetStats;
+exports.shimReceiverGetStats = shimReceiverGetStats;
+exports.shimRemoveStream = shimRemoveStream;
+exports.shimRTCDataChannel = shimRTCDataChannel;
+exports.shimAddTransceiver = shimAddTransceiver;
+exports.shimCreateOffer = shimCreateOffer;
+exports.shimCreateAnswer = shimCreateAnswer;
+Object.defineProperty(exports, "shimGetUserMedia", {
+  enumerable: true,
+  get: function () {
+    return _getusermedia.shimGetUserMedia;
+  }
+});
+Object.defineProperty(exports, "shimGetDisplayMedia", {
+  enumerable: true,
+  get: function () {
+    return _getdisplaymedia.shimGetDisplayMedia;
+  }
+});
+
+var utils = _interopRequireWildcard(require("../utils"));
+
+var _getusermedia = require("./getusermedia");
+
+var _getdisplaymedia = require("./getdisplaymedia");
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function shimOnTrack(window) {
+  if (_typeof(window) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {
+    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
+      get: function () {
+        return {
+          receiver: this.receiver
+        };
+      }
+    });
+  }
+}
+
+function shimPeerConnection(window) {
+  var browserDetails = utils.detectBrowser(window);
+
+  if (_typeof(window) !== 'object' || !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {
+    return; // probably media.peerconnection.enabled=false in about:config
+  }
+
+  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {
+    // very basic support for old versions.
+    window.RTCPeerConnection = window.mozRTCPeerConnection;
+  }
+
+  if (browserDetails.version < 53) {
+    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.
+    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
+      var nativeMethod = window.RTCPeerConnection.prototype[method];
+
+      var methodObj = _defineProperty({}, method, function () {
+        arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
+        return nativeMethod.apply(this, arguments);
+      });
+
+      window.RTCPeerConnection.prototype[method] = methodObj[method];
+    });
+  } // support for addIceCandidate(null or undefined)
+  // as well as ignoring {sdpMid, candidate: ""}
+
+
+  if (browserDetails.version < 68) {
+    var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;
+
+    window.RTCPeerConnection.prototype.addIceCandidate = function addIceCandidate() {
+      if (!arguments[0]) {
+        if (arguments[1]) {
+          arguments[1].apply(null);
+        }
+
+        return Promise.resolve();
+      } // Firefox 68+ emits and processes {candidate: "", ...}, ignore
+      // in older versions.
+
+
+      if (arguments[0] && arguments[0].candidate === '') {
+        return Promise.resolve();
+      }
+
+      return nativeAddIceCandidate.apply(this, arguments);
+    };
+  }
+
+  var modernStatsTypes = {
+    inboundrtp: 'inbound-rtp',
+    outboundrtp: 'outbound-rtp',
+    candidatepair: 'candidate-pair',
+    localcandidate: 'local-candidate',
+    remotecandidate: 'remote-candidate'
+  };
+  var nativeGetStats = window.RTCPeerConnection.prototype.getStats;
+
+  window.RTCPeerConnection.prototype.getStats = function getStats() {
+    var [selector, onSucc, onErr] = arguments;
+    return nativeGetStats.apply(this, [selector || null]).then(function (stats) {
+      if (browserDetails.version < 53 && !onSucc) {
+        // Shim only promise getStats with spec-hyphens in type names
+        // Leave callback version alone; misc old uses of forEach before Map
+        try {
+          stats.forEach(function (stat) {
+            stat.type = modernStatsTypes[stat.type] || stat.type;
+          });
+        } catch (e) {
+          if (e.name !== 'TypeError') {
+            throw e;
+          } // Avoid TypeError: "type" is read-only, in old versions. 34-43ish
+
+
+          stats.forEach(function (stat, i) {
+            stats.set(i, Object.assign({}, stat, {
+              type: modernStatsTypes[stat.type] || stat.type
+            }));
+          });
+        }
+      }
+
+      return stats;
+    }).then(onSucc, onErr);
+  };
+}
+
+function shimSenderGetStats(window) {
+  if (!(_typeof(window) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {
+    return;
+  }
+
+  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {
+    return;
+  }
+
+  var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
+
+  if (origGetSenders) {
+    window.RTCPeerConnection.prototype.getSenders = function getSenders() {
+      var _this = this;
+
+      var senders = origGetSenders.apply(this, []);
+      senders.forEach(function (sender) {
+        return sender._pc = _this;
+      });
+      return senders;
+    };
+  }
+
+  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
+
+  if (origAddTrack) {
+    window.RTCPeerConnection.prototype.addTrack = function addTrack() {
+      var sender = origAddTrack.apply(this, arguments);
+      sender._pc = this;
+      return sender;
+    };
+  }
+
+  window.RTCRtpSender.prototype.getStats = function getStats() {
+    return this.track ? this._pc.getStats(this.track) : Promise.resolve(new Map());
+  };
+}
+
+function shimReceiverGetStats(window) {
+  if (!(_typeof(window) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {
+    return;
+  }
+
+  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {
+    return;
+  }
+
+  var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
+
+  if (origGetReceivers) {
+    window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {
+      var _this2 = this;
+
+      var receivers = origGetReceivers.apply(this, []);
+      receivers.forEach(function (receiver) {
+        return receiver._pc = _this2;
+      });
+      return receivers;
+    };
+  }
+
+  utils.wrapPeerConnectionEvent(window, 'track', function (e) {
+    e.receiver._pc = e.srcElement;
+    return e;
+  });
+
+  window.RTCRtpReceiver.prototype.getStats = function getStats() {
+    return this._pc.getStats(this.track);
+  };
+}
+
+function shimRemoveStream(window) {
+  if (!window.RTCPeerConnection || 'removeStream' in window.RTCPeerConnection.prototype) {
+    return;
+  }
+
+  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+    var _this3 = this;
+
+    utils.deprecated('removeStream', 'removeTrack');
+    this.getSenders().forEach(function (sender) {
+      if (sender.track && stream.getTracks().includes(sender.track)) {
+        _this3.removeTrack(sender);
+      }
+    });
+  };
+}
+
+function shimRTCDataChannel(window) {
+  // rename DataChannel to RTCDataChannel (native fix in FF60):
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851
+  if (window.DataChannel && !window.RTCDataChannel) {
+    window.RTCDataChannel = window.DataChannel;
+  }
+}
+
+function shimAddTransceiver(window) {
+  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
+  // Firefox ignores the init sendEncodings options passed to addTransceiver
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
+  if (!(_typeof(window) === 'object' && window.RTCPeerConnection)) {
+    return;
+  }
+
+  var origAddTransceiver = window.RTCPeerConnection.prototype.addTransceiver;
+
+  if (origAddTransceiver) {
+    window.RTCPeerConnection.prototype.addTransceiver = function addTransceiver() {
+      this.setParametersPromises = [];
+      var initParameters = arguments[1];
+      var shouldPerformCheck = initParameters && 'sendEncodings' in initParameters;
+
+      if (shouldPerformCheck) {
+        // If sendEncodings params are provided, validate grammar
+        initParameters.sendEncodings.forEach(function (encodingParam) {
+          if ('rid' in encodingParam) {
+            var ridRegex = /^[a-z0-9]{0,16}$/i;
+
+            if (!ridRegex.test(encodingParam.rid)) {
+              throw new TypeError('Invalid RID value provided.');
+            }
+          }
+
+          if ('scaleResolutionDownBy' in encodingParam) {
+            if (!(parseFloat(encodingParam.scaleResolutionDownBy) >= 1.0)) {
+              throw new RangeError('scale_resolution_down_by must be >= 1.0');
+            }
+          }
+
+          if ('maxFramerate' in encodingParam) {
+            if (!(parseFloat(encodingParam.maxFramerate) >= 0)) {
+              throw new RangeError('max_framerate must be >= 0.0');
+            }
+          }
+        });
+      }
+
+      var transceiver = origAddTransceiver.apply(this, arguments);
+
+      if (shouldPerformCheck) {
+        // Check if the init options were applied. If not we do this in an
+        // asynchronous way and save the promise reference in a global object.
+        // This is an ugly hack, but at the same time is way more robust than
+        // checking the sender parameters before and after the createOffer
+        // Also note that after the createoffer we are not 100% sure that
+        // the params were asynchronously applied so we might miss the
+        // opportunity to recreate offer.
+        var {
+          sender: sender
+        } = transceiver;
+        var params = sender.getParameters();
+
+        if (!('encodings' in params)) {
+          params.encodings = initParameters.sendEncodings;
+          this.setParametersPromises.push(sender.setParameters(params).catch(function () {}));
+        }
+      }
+
+      return transceiver;
+    };
+  }
+}
+
+function shimCreateOffer(window) {
+  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
+  // Firefox ignores the init sendEncodings options passed to addTransceiver
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
+  if (!(_typeof(window) === 'object' && window.RTCPeerConnection)) {
+    return;
+  }
+
+  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
+
+  window.RTCPeerConnection.prototype.createOffer = function createOffer() {
+    var _this4 = this,
+        _arguments = arguments;
+
+    if (this.setParametersPromises && this.setParametersPromises.length) {
+      return Promise.all(this.setParametersPromises).then(function () {
+        return origCreateOffer.apply(_this4, _arguments);
+      }).finally(function () {
+        _this4.setParametersPromises = [];
+      });
+    }
+
+    return origCreateOffer.apply(this, arguments);
+  };
+}
+
+function shimCreateAnswer(window) {
+  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
+  // Firefox ignores the init sendEncodings options passed to addTransceiver
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
+  if (!(_typeof(window) === 'object' && window.RTCPeerConnection)) {
+    return;
+  }
+
+  var origCreateAnswer = window.RTCPeerConnection.prototype.createAnswer;
+
+  window.RTCPeerConnection.prototype.createAnswer = function createAnswer() {
+    var _this5 = this,
+        _arguments2 = arguments;
+
+    if (this.setParametersPromises && this.setParametersPromises.length) {
+      return Promise.all(this.setParametersPromises).then(function () {
+        return origCreateAnswer.apply(_this5, _arguments2);
+      }).finally(function () {
+        _this5.setParametersPromises = [];
+      });
+    }
+
+    return origCreateAnswer.apply(this, arguments);
+  };
+}
+},{"../utils":"iSxC","./getusermedia":"/GzS","./getdisplaymedia":"UuGU"}],"t1lL":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimLocalStreamsAPI = shimLocalStreamsAPI;
+exports.shimRemoteStreamsAPI = shimRemoteStreamsAPI;
+exports.shimCallbacksAPI = shimCallbacksAPI;
+exports.shimGetUserMedia = shimGetUserMedia;
+exports.shimConstraints = shimConstraints;
+exports.shimRTCIceServerUrls = shimRTCIceServerUrls;
+exports.shimTrackEventTransceiver = shimTrackEventTransceiver;
+exports.shimCreateOfferLegacy = shimCreateOfferLegacy;
+
+var utils = _interopRequireWildcard(require("../utils"));
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function shimLocalStreamsAPI(window) {
+  if (_typeof(window) !== 'object' || !window.RTCPeerConnection) {
+    return;
+  }
+
+  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {
+    window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
+      if (!this._localStreams) {
+        this._localStreams = [];
+      }
+
+      return this._localStreams;
+    };
+  }
+
+  if (!('addStream' in window.RTCPeerConnection.prototype)) {
+    var _addTrack = window.RTCPeerConnection.prototype.addTrack;
+
+    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
+      var _this = this;
+
+      if (!this._localStreams) {
+        this._localStreams = [];
+      }
+
+      if (!this._localStreams.includes(stream)) {
+        this._localStreams.push(stream);
+      } // Try to emulate Chrome's behaviour of adding in audio-video order.
+      // Safari orders by track id.
+
+
+      stream.getAudioTracks().forEach(function (track) {
+        return _addTrack.call(_this, track, stream);
+      });
+      stream.getVideoTracks().forEach(function (track) {
+        return _addTrack.call(_this, track, stream);
+      });
+    };
+
+    window.RTCPeerConnection.prototype.addTrack = function addTrack(track) {
+      var stream = arguments[1];
+
+      if (stream) {
+        if (!this._localStreams) {
+          this._localStreams = [stream];
+        } else if (!this._localStreams.includes(stream)) {
+          this._localStreams.push(stream);
+        }
+      }
+
+      return _addTrack.apply(this, arguments);
+    };
+  }
+
+  if (!('removeStream' in window.RTCPeerConnection.prototype)) {
+    window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+      var _this2 = this;
+
+      if (!this._localStreams) {
+        this._localStreams = [];
+      }
+
+      var index = this._localStreams.indexOf(stream);
+
+      if (index === -1) {
+        return;
+      }
+
+      this._localStreams.splice(index, 1);
+
+      var tracks = stream.getTracks();
+      this.getSenders().forEach(function (sender) {
+        if (tracks.includes(sender.track)) {
+          _this2.removeTrack(sender);
+        }
+      });
+    };
+  }
+}
+
+function shimRemoteStreamsAPI(window) {
+  if (_typeof(window) !== 'object' || !window.RTCPeerConnection) {
+    return;
+  }
+
+  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {
+    window.RTCPeerConnection.prototype.getRemoteStreams = function getRemoteStreams() {
+      return this._remoteStreams ? this._remoteStreams : [];
+    };
+  }
+
+  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {
+    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {
+      get: function () {
+        return this._onaddstream;
+      },
+      set: function (f) {
+        var _this3 = this;
+
+        if (this._onaddstream) {
+          this.removeEventListener('addstream', this._onaddstream);
+          this.removeEventListener('track', this._onaddstreampoly);
+        }
+
+        this.addEventListener('addstream', this._onaddstream = f);
+        this.addEventListener('track', this._onaddstreampoly = function (e) {
+          e.streams.forEach(function (stream) {
+            if (!_this3._remoteStreams) {
+              _this3._remoteStreams = [];
+            }
+
+            if (_this3._remoteStreams.includes(stream)) {
+              return;
+            }
+
+            _this3._remoteStreams.push(stream);
+
+            var event = new Event('addstream');
+            event.stream = stream;
+
+            _this3.dispatchEvent(event);
+          });
+        });
+      }
+    });
+    var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
+
+    window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
+      var pc = this;
+
+      if (!this._onaddstreampoly) {
+        this.addEventListener('track', this._onaddstreampoly = function (e) {
+          e.streams.forEach(function (stream) {
+            if (!pc._remoteStreams) {
+              pc._remoteStreams = [];
+            }
+
+            if (pc._remoteStreams.indexOf(stream) >= 0) {
+              return;
+            }
+
+            pc._remoteStreams.push(stream);
+
+            var event = new Event('addstream');
+            event.stream = stream;
+            pc.dispatchEvent(event);
+          });
+        });
+      }
+
+      return origSetRemoteDescription.apply(pc, arguments);
+    };
+  }
+}
+
+function shimCallbacksAPI(window) {
+  if (_typeof(window) !== 'object' || !window.RTCPeerConnection) {
+    return;
+  }
+
+  var prototype = window.RTCPeerConnection.prototype;
+  var origCreateOffer = prototype.createOffer;
+  var origCreateAnswer = prototype.createAnswer;
+  var setLocalDescription = prototype.setLocalDescription;
+  var setRemoteDescription = prototype.setRemoteDescription;
+  var addIceCandidate = prototype.addIceCandidate;
+
+  prototype.createOffer = function createOffer(successCallback, failureCallback) {
+    var options = arguments.length >= 2 ? arguments[2] : arguments[0];
+    var promise = origCreateOffer.apply(this, [options]);
+
+    if (!failureCallback) {
+      return promise;
+    }
+
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+
+  prototype.createAnswer = function createAnswer(successCallback, failureCallback) {
+    var options = arguments.length >= 2 ? arguments[2] : arguments[0];
+    var promise = origCreateAnswer.apply(this, [options]);
+
+    if (!failureCallback) {
+      return promise;
+    }
+
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+
+  var withCallback = function (description, successCallback, failureCallback) {
+    var promise = setLocalDescription.apply(this, [description]);
+
+    if (!failureCallback) {
+      return promise;
+    }
+
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+
+  prototype.setLocalDescription = withCallback;
+
+  withCallback = function (description, successCallback, failureCallback) {
+    var promise = setRemoteDescription.apply(this, [description]);
+
+    if (!failureCallback) {
+      return promise;
+    }
+
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+
+  prototype.setRemoteDescription = withCallback;
+
+  withCallback = function (candidate, successCallback, failureCallback) {
+    var promise = addIceCandidate.apply(this, [candidate]);
+
+    if (!failureCallback) {
+      return promise;
+    }
+
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+
+  prototype.addIceCandidate = withCallback;
+}
+
+function shimGetUserMedia(window) {
+  var navigator = window && window.navigator;
+
+  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
+    // shim not needed in Safari 12.1
+    var mediaDevices = navigator.mediaDevices;
+
+    var _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);
+
+    navigator.mediaDevices.getUserMedia = function (constraints) {
+      return _getUserMedia(shimConstraints(constraints));
+    };
+  }
+
+  if (!navigator.getUserMedia && navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
+    navigator.getUserMedia = function getUserMedia(constraints, cb, errcb) {
+      navigator.mediaDevices.getUserMedia(constraints).then(cb, errcb);
+    }.bind(navigator);
+  }
+}
+
+function shimConstraints(constraints) {
+  if (constraints && constraints.video !== undefined) {
+    return Object.assign({}, constraints, {
+      video: utils.compactObject(constraints.video)
+    });
+  }
+
+  return constraints;
+}
+
+function shimRTCIceServerUrls(window) {
+  // migrate from non-spec RTCIceServer.url to RTCIceServer.urls
+  var OrigPeerConnection = window.RTCPeerConnection;
+
+  window.RTCPeerConnection = function RTCPeerConnection(pcConfig, pcConstraints) {
+    if (pcConfig && pcConfig.iceServers) {
+      var newIceServers = [];
+
+      for (var i = 0; i < pcConfig.iceServers.length; i++) {
+        var server = pcConfig.iceServers[i];
+
+        if (!server.hasOwnProperty('urls') && server.hasOwnProperty('url')) {
+          utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');
+          server = JSON.parse(JSON.stringify(server));
+          server.urls = server.url;
+          delete server.url;
+          newIceServers.push(server);
+        } else {
+          newIceServers.push(pcConfig.iceServers[i]);
+        }
+      }
+
+      pcConfig.iceServers = newIceServers;
+    }
+
+    return new OrigPeerConnection(pcConfig, pcConstraints);
+  };
+
+  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype; // wrap static methods. Currently just generateCertificate.
+
+  if ('generateCertificate' in window.RTCPeerConnection) {
+    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
+      get: function () {
+        return OrigPeerConnection.generateCertificate;
+      }
+    });
+  }
+}
+
+function shimTrackEventTransceiver(window) {
+  // Add event.transceiver member over deprecated event.receiver
+  if (_typeof(window) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {
+    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
+      get: function () {
+        return {
+          receiver: this.receiver
+        };
+      }
+    });
+  }
+}
+
+function shimCreateOfferLegacy(window) {
+  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
+
+  window.RTCPeerConnection.prototype.createOffer = function createOffer(offerOptions) {
+    if (offerOptions) {
+      if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {
+        // support bit values
+        offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;
+      }
+
+      var audioTransceiver = this.getTransceivers().find(function (transceiver) {
+        return transceiver.receiver.track.kind === 'audio';
+      });
+
+      if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {
+        if (audioTransceiver.direction === 'sendrecv') {
+          if (audioTransceiver.setDirection) {
+            audioTransceiver.setDirection('sendonly');
+          } else {
+            audioTransceiver.direction = 'sendonly';
+          }
+        } else if (audioTransceiver.direction === 'recvonly') {
+          if (audioTransceiver.setDirection) {
+            audioTransceiver.setDirection('inactive');
+          } else {
+            audioTransceiver.direction = 'inactive';
+          }
+        }
+      } else if (offerOptions.offerToReceiveAudio === true && !audioTransceiver) {
+        this.addTransceiver('audio');
+      }
+
+      if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {
+        // support bit values
+        offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;
+      }
+
+      var videoTransceiver = this.getTransceivers().find(function (transceiver) {
+        return transceiver.receiver.track.kind === 'video';
+      });
+
+      if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {
+        if (videoTransceiver.direction === 'sendrecv') {
+          if (videoTransceiver.setDirection) {
+            videoTransceiver.setDirection('sendonly');
+          } else {
+            videoTransceiver.direction = 'sendonly';
+          }
+        } else if (videoTransceiver.direction === 'recvonly') {
+          if (videoTransceiver.setDirection) {
+            videoTransceiver.setDirection('inactive');
+          } else {
+            videoTransceiver.direction = 'inactive';
+          }
+        }
+      } else if (offerOptions.offerToReceiveVideo === true && !videoTransceiver) {
+        this.addTransceiver('video');
+      }
+    }
+
+    return origCreateOffer.apply(this, arguments);
+  };
+}
+},{"../utils":"iSxC"}],"GOQK":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimRTCIceCandidate = shimRTCIceCandidate;
+exports.shimMaxMessageSize = shimMaxMessageSize;
+exports.shimSendThrowTypeError = shimSendThrowTypeError;
+exports.shimConnectionState = shimConnectionState;
+exports.removeAllowExtmapMixed = removeAllowExtmapMixed;
+
+var _sdp = _interopRequireDefault(require("sdp"));
+
+var utils = _interopRequireWildcard(require("./utils"));
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+function shimRTCIceCandidate(window) {
+  // foundation is arbitrarily chosen as an indicator for full support for
+  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface
+  if (!window.RTCIceCandidate || window.RTCIceCandidate && 'foundation' in window.RTCIceCandidate.prototype) {
+    return;
+  }
+
+  var NativeRTCIceCandidate = window.RTCIceCandidate;
+
+  window.RTCIceCandidate = function RTCIceCandidate(args) {
+    // Remove the a= which shouldn't be part of the candidate string.
+    if (_typeof(args) === 'object' && args.candidate && args.candidate.indexOf('a=') === 0) {
+      args = JSON.parse(JSON.stringify(args));
+      args.candidate = args.candidate.substr(2);
+    }
+
+    if (args.candidate && args.candidate.length) {
+      // Augment the native candidate with the parsed fields.
+      var nativeCandidate = new NativeRTCIceCandidate(args);
+
+      var parsedCandidate = _sdp.default.parseCandidate(args.candidate);
+
+      var augmentedCandidate = Object.assign(nativeCandidate, parsedCandidate); // Add a serializer that does not serialize the extra attributes.
+
+      augmentedCandidate.toJSON = function toJSON() {
+        return {
+          candidate: augmentedCandidate.candidate,
+          sdpMid: augmentedCandidate.sdpMid,
+          sdpMLineIndex: augmentedCandidate.sdpMLineIndex,
+          usernameFragment: augmentedCandidate.usernameFragment
+        };
+      };
+
+      return augmentedCandidate;
+    }
+
+    return new NativeRTCIceCandidate(args);
+  };
+
+  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype; // Hook up the augmented candidate in onicecandidate and
+  // addEventListener('icecandidate', ...)
+
+  utils.wrapPeerConnectionEvent(window, 'icecandidate', function (e) {
+    if (e.candidate) {
+      Object.defineProperty(e, 'candidate', {
+        value: new window.RTCIceCandidate(e.candidate),
+        writable: 'false'
+      });
+    }
+
+    return e;
+  });
+}
+
+function shimMaxMessageSize(window) {
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+
+  var browserDetails = utils.detectBrowser(window);
+
+  if (!('sctp' in window.RTCPeerConnection.prototype)) {
+    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {
+      get: function () {
+        return typeof this._sctp === 'undefined' ? null : this._sctp;
+      }
+    });
+  }
+
+  var sctpInDescription = function (description) {
+    if (!description || !description.sdp) {
+      return false;
+    }
+
+    var sections = _sdp.default.splitSections(description.sdp);
+
+    sections.shift();
+    return sections.some(function (mediaSection) {
+      var mLine = _sdp.default.parseMLine(mediaSection);
+
+      return mLine && mLine.kind === 'application' && mLine.protocol.indexOf('SCTP') !== -1;
+    });
+  };
+
+  var getRemoteFirefoxVersion = function (description) {
+    // TODO: Is there a better solution for detecting Firefox?
+    var match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\d+)/);
+
+    if (match === null || match.length < 2) {
+      return -1;
+    }
+
+    var version = parseInt(match[1], 10); // Test for NaN (yes, this is ugly)
+
+    return version !== version ? -1 : version;
+  };
+
+  var getCanSendMaxMessageSize = function (remoteIsFirefox) {
+    // Every implementation we know can send at least 64 KiB.
+    // Note: Although Chrome is technically able to send up to 256 KiB, the
+    //       data does not reach the other peer reliably.
+    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419
+    var canSendMaxMessageSize = 65536;
+
+    if (browserDetails.browser === 'firefox') {
+      if (browserDetails.version < 57) {
+        if (remoteIsFirefox === -1) {
+          // FF < 57 will send in 16 KiB chunks using the deprecated PPID
+          // fragmentation.
+          canSendMaxMessageSize = 16384;
+        } else {
+          // However, other FF (and RAWRTC) can reassemble PPID-fragmented
+          // messages. Thus, supporting ~2 GiB when sending.
+          canSendMaxMessageSize = 2147483637;
+        }
+      } else if (browserDetails.version < 60) {
+        // Currently, all FF >= 57 will reset the remote maximum message size
+        // to the default value when a data channel is created at a later
+        // stage. :(
+        // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
+        canSendMaxMessageSize = browserDetails.version === 57 ? 65535 : 65536;
+      } else {
+        // FF >= 60 supports sending ~2 GiB
+        canSendMaxMessageSize = 2147483637;
+      }
+    }
+
+    return canSendMaxMessageSize;
+  };
+
+  var getMaxMessageSize = function (description, remoteIsFirefox) {
+    // Note: 65536 bytes is the default value from the SDP spec. Also,
+    //       every implementation we know supports receiving 65536 bytes.
+    var maxMessageSize = 65536; // FF 57 has a slightly incorrect default remote max message size, so
+    // we need to adjust it here to avoid a failure when sending.
+    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697
+
+    if (browserDetails.browser === 'firefox' && browserDetails.version === 57) {
+      maxMessageSize = 65535;
+    }
+
+    var match = _sdp.default.matchPrefix(description.sdp, 'a=max-message-size:');
+
+    if (match.length > 0) {
+      maxMessageSize = parseInt(match[0].substr(19), 10);
+    } else if (browserDetails.browser === 'firefox' && remoteIsFirefox !== -1) {
+      // If the maximum message size is not present in the remote SDP and
+      // both local and remote are Firefox, the remote peer can receive
+      // ~2 GiB.
+      maxMessageSize = 2147483637;
+    }
+
+    return maxMessageSize;
+  };
+
+  var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
+
+  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
+    this._sctp = null; // Chrome decided to not expose .sctp in plan-b mode.
+    // As usual, adapter.js has to do an 'ugly worakaround'
+    // to cover up the mess.
+
+    if (browserDetails.browser === 'chrome' && browserDetails.version >= 76) {
+      var {
+        sdpSemantics: sdpSemantics
+      } = this.getConfiguration();
+
+      if (sdpSemantics === 'plan-b') {
+        Object.defineProperty(this, 'sctp', {
+          get: function () {
+            return typeof this._sctp === 'undefined' ? null : this._sctp;
+          },
+          enumerable: true,
+          configurable: true
+        });
+      }
+    }
+
+    if (sctpInDescription(arguments[0])) {
+      // Check if the remote is FF.
+      var isFirefox = getRemoteFirefoxVersion(arguments[0]); // Get the maximum message size the local peer is capable of sending
+
+      var canSendMMS = getCanSendMaxMessageSize(isFirefox); // Get the maximum message size of the remote peer.
+
+      var remoteMMS = getMaxMessageSize(arguments[0], isFirefox); // Determine final maximum message size
+
+      var maxMessageSize;
+
+      if (canSendMMS === 0 && remoteMMS === 0) {
+        maxMessageSize = Number.POSITIVE_INFINITY;
+      } else if (canSendMMS === 0 || remoteMMS === 0) {
+        maxMessageSize = Math.max(canSendMMS, remoteMMS);
+      } else {
+        maxMessageSize = Math.min(canSendMMS, remoteMMS);
+      } // Create a dummy RTCSctpTransport object and the 'maxMessageSize'
+      // attribute.
+
+
+      var sctp = {};
+      Object.defineProperty(sctp, 'maxMessageSize', {
+        get: function () {
+          return maxMessageSize;
+        }
+      });
+      this._sctp = sctp;
+    }
+
+    return origSetRemoteDescription.apply(this, arguments);
+  };
+}
+
+function shimSendThrowTypeError(window) {
+  if (!(window.RTCPeerConnection && 'createDataChannel' in window.RTCPeerConnection.prototype)) {
+    return;
+  } // Note: Although Firefox >= 57 has a native implementation, the maximum
+  //       message size can be reset for all data channels at a later stage.
+  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
+
+
+  function wrapDcSend(dc, pc) {
+    var origDataChannelSend = dc.send;
+
+    dc.send = function send() {
+      var data = arguments[0];
+      var length = data.length || data.size || data.byteLength;
+
+      if (dc.readyState === 'open' && pc.sctp && length > pc.sctp.maxMessageSize) {
+        throw new TypeError('Message too large (can send a maximum of ' + pc.sctp.maxMessageSize + ' bytes)');
+      }
+
+      return origDataChannelSend.apply(dc, arguments);
+    };
+  }
+
+  var origCreateDataChannel = window.RTCPeerConnection.prototype.createDataChannel;
+
+  window.RTCPeerConnection.prototype.createDataChannel = function createDataChannel() {
+    var dataChannel = origCreateDataChannel.apply(this, arguments);
+    wrapDcSend(dataChannel, this);
+    return dataChannel;
+  };
+
+  utils.wrapPeerConnectionEvent(window, 'datachannel', function (e) {
+    wrapDcSend(e.channel, e.target);
+    return e;
+  });
+}
+/* shims RTCConnectionState by pretending it is the same as iceConnectionState.
+ * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12
+ * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect
+ * since DTLS failures would be hidden. See
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827
+ * for the Firefox tracking bug.
+ */
+
+
+function shimConnectionState(window) {
+  if (!window.RTCPeerConnection || 'connectionState' in window.RTCPeerConnection.prototype) {
+    return;
+  }
+
+  var proto = window.RTCPeerConnection.prototype;
+  Object.defineProperty(proto, 'connectionState', {
+    get: function () {
+      return {
+        completed: 'connected',
+        checking: 'connecting'
+      }[this.iceConnectionState] || this.iceConnectionState;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(proto, 'onconnectionstatechange', {
+    get: function () {
+      return this._onconnectionstatechange || null;
+    },
+    set: function (cb) {
+      if (this._onconnectionstatechange) {
+        this.removeEventListener('connectionstatechange', this._onconnectionstatechange);
+        delete this._onconnectionstatechange;
+      }
+
+      if (cb) {
+        this.addEventListener('connectionstatechange', this._onconnectionstatechange = cb);
+      }
+    },
+    enumerable: true,
+    configurable: true
+  });
+  ['setLocalDescription', 'setRemoteDescription'].forEach(function (method) {
+    var origMethod = proto[method];
+
+    proto[method] = function () {
+      if (!this._connectionstatechangepoly) {
+        this._connectionstatechangepoly = function (e) {
+          var pc = e.target;
+
+          if (pc._lastConnectionState !== pc.connectionState) {
+            pc._lastConnectionState = pc.connectionState;
+            var newEvent = new Event('connectionstatechange', e);
+            pc.dispatchEvent(newEvent);
+          }
+
+          return e;
+        };
+
+        this.addEventListener('iceconnectionstatechange', this._connectionstatechangepoly);
+      }
+
+      return origMethod.apply(this, arguments);
+    };
+  });
+}
+
+function removeAllowExtmapMixed(window) {
+  /* remove a=extmap-allow-mixed for Chrome < M71 */
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+
+  var browserDetails = utils.detectBrowser(window);
+
+  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {
+    return;
+  }
+
+  var nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;
+
+  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription(desc) {
+    if (desc && desc.sdp && desc.sdp.indexOf('\na=extmap-allow-mixed') !== -1) {
+      desc.sdp = desc.sdp.split('\n').filter(function (line) {
+        return line.trim() !== 'a=extmap-allow-mixed';
+      }).join('\n');
+    }
+
+    return nativeSRD.apply(this, arguments);
+  };
+}
+},{"sdp":"YHvh","./utils":"iSxC"}],"KtlG":[function(require,module,exports) {
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.adapterFactory = adapterFactory;
+
+var utils = _interopRequireWildcard(require("./utils"));
+
+var chromeShim = _interopRequireWildcard(require("./chrome/chrome_shim"));
+
+var edgeShim = _interopRequireWildcard(require("./edge/edge_shim"));
+
+var firefoxShim = _interopRequireWildcard(require("./firefox/firefox_shim"));
+
+var safariShim = _interopRequireWildcard(require("./safari/safari_shim"));
+
+var commonShim = _interopRequireWildcard(require("./common_shim"));
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+// Browser shims.
+// Shimming starts here.
+function adapterFactory() {
+  var {
+    window: window
+  } = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
+    shimChrome: true,
+    shimFirefox: true,
+    shimEdge: true,
+    shimSafari: true
+  };
+  // Utils.
+  var logging = utils.log;
+  var browserDetails = utils.detectBrowser(window);
+  var adapter = {
+    browserDetails: browserDetails,
+    commonShim: commonShim,
+    extractVersion: utils.extractVersion,
+    disableLog: utils.disableLog,
+    disableWarnings: utils.disableWarnings
+  }; // Shim browser if found.
+
+  switch (browserDetails.browser) {
+    case 'chrome':
+      if (!chromeShim || !chromeShim.shimPeerConnection || !options.shimChrome) {
+        logging('Chrome shim is not included in this adapter release.');
+        return adapter;
+      }
+
+      logging('adapter.js shimming chrome.'); // Export to the adapter global object visible in the browser.
+
+      adapter.browserShim = chromeShim;
+      chromeShim.shimGetUserMedia(window);
+      chromeShim.shimMediaStream(window);
+      chromeShim.shimPeerConnection(window);
+      chromeShim.shimOnTrack(window);
+      chromeShim.shimAddTrackRemoveTrack(window);
+      chromeShim.shimGetSendersWithDtmf(window);
+      chromeShim.shimGetStats(window);
+      chromeShim.shimSenderReceiverGetStats(window);
+      chromeShim.fixNegotiationNeeded(window);
+      commonShim.shimRTCIceCandidate(window);
+      commonShim.shimConnectionState(window);
+      commonShim.shimMaxMessageSize(window);
+      commonShim.shimSendThrowTypeError(window);
+      commonShim.removeAllowExtmapMixed(window);
+      break;
+
+    case 'firefox':
+      if (!firefoxShim || !firefoxShim.shimPeerConnection || !options.shimFirefox) {
+        logging('Firefox shim is not included in this adapter release.');
+        return adapter;
+      }
+
+      logging('adapter.js shimming firefox.'); // Export to the adapter global object visible in the browser.
+
+      adapter.browserShim = firefoxShim;
+      firefoxShim.shimGetUserMedia(window);
+      firefoxShim.shimPeerConnection(window);
+      firefoxShim.shimOnTrack(window);
+      firefoxShim.shimRemoveStream(window);
+      firefoxShim.shimSenderGetStats(window);
+      firefoxShim.shimReceiverGetStats(window);
+      firefoxShim.shimRTCDataChannel(window);
+      firefoxShim.shimAddTransceiver(window);
+      firefoxShim.shimCreateOffer(window);
+      firefoxShim.shimCreateAnswer(window);
+      commonShim.shimRTCIceCandidate(window);
+      commonShim.shimConnectionState(window);
+      commonShim.shimMaxMessageSize(window);
+      commonShim.shimSendThrowTypeError(window);
+      break;
+
+    case 'edge':
+      if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {
+        logging('MS edge shim is not included in this adapter release.');
+        return adapter;
+      }
+
+      logging('adapter.js shimming edge.'); // Export to the adapter global object visible in the browser.
+
+      adapter.browserShim = edgeShim;
+      edgeShim.shimGetUserMedia(window);
+      edgeShim.shimGetDisplayMedia(window);
+      edgeShim.shimPeerConnection(window);
+      edgeShim.shimReplaceTrack(window); // the edge shim implements the full RTCIceCandidate object.
+
+      commonShim.shimMaxMessageSize(window);
+      commonShim.shimSendThrowTypeError(window);
+      break;
+
+    case 'safari':
+      if (!safariShim || !options.shimSafari) {
+        logging('Safari shim is not included in this adapter release.');
+        return adapter;
+      }
+
+      logging('adapter.js shimming safari.'); // Export to the adapter global object visible in the browser.
+
+      adapter.browserShim = safariShim;
+      safariShim.shimRTCIceServerUrls(window);
+      safariShim.shimCreateOfferLegacy(window);
+      safariShim.shimCallbacksAPI(window);
+      safariShim.shimLocalStreamsAPI(window);
+      safariShim.shimRemoteStreamsAPI(window);
+      safariShim.shimTrackEventTransceiver(window);
+      safariShim.shimGetUserMedia(window);
+      commonShim.shimRTCIceCandidate(window);
+      commonShim.shimMaxMessageSize(window);
+      commonShim.shimSendThrowTypeError(window);
+      commonShim.removeAllowExtmapMixed(window);
+      break;
+
+    default:
+      logging('Unsupported browser!');
+      break;
+  }
+
+  return adapter;
+}
+},{"./utils":"iSxC","./chrome/chrome_shim":"uI5X","./edge/edge_shim":"XRic","./firefox/firefox_shim":"Fzdr","./safari/safari_shim":"t1lL","./common_shim":"GOQK"}],"tI1X":[function(require,module,exports) {
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _adapter_factory = require("./adapter_factory.js");
+
+var adapter = (0, _adapter_factory.adapterFactory)({
+  window: window
+});
+var _default = adapter;
+exports.default = _default;
+},{"./adapter_factory.js":"KtlG"}],"sXtV":[function(require,module,exports) {
+"use strict";
+
+var __importDefault = this && this.__importDefault || function (mod) {
+  return mod && mod.__esModule ? mod : {
+    "default": mod
+  };
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var webrtc_adapter_1 = __importDefault(require("webrtc-adapter"));
+
+exports.webRTCAdapter = webrtc_adapter_1.default;
+},{"webrtc-adapter":"tI1X"}],"I+31":[function(require,module,exports) {
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var adapter_1 = require("./adapter");
+
+exports.Supports = new (
+/** @class */
+function () {
+  function class_1() {
+    this.isIOS = ['iPad', 'iPhone', 'iPod'].includes(navigator.platform);
+    this.supportedBrowsers = ['firefox', 'chrome', 'safari'];
+    this.minFirefoxVersion = 59;
+    this.minChromeVersion = 72;
+    this.minSafariVersion = 605;
+  }
+
+  class_1.prototype.isWebRTCSupported = function () {
+    return typeof RTCPeerConnection !== 'undefined';
+  };
+
+  ;
+
+  class_1.prototype.isBrowserSupported = function () {
+    var browser = this.getBrowser();
+    var version = this.getVersion();
+    var validBrowser = this.supportedBrowsers.includes(browser);
+    if (!validBrowser) return false;
+    if (browser === 'chrome') return version >= this.minChromeVersion;
+    if (browser === 'firefox') return version >= this.minFirefoxVersion;
+    if (browser === 'safari') return !this.isIOS && version >= this.minSafariVersion;
+    return false;
+  };
+
+  class_1.prototype.getBrowser = function () {
+    return adapter_1.webRTCAdapter.browserDetails.browser;
+  };
+
+  class_1.prototype.getVersion = function () {
+    return adapter_1.webRTCAdapter.browserDetails.version || 0;
+  };
+
+  class_1.prototype.isUnifiedPlanSupported = function () {
+    var browser = this.getBrowser();
+    var version = adapter_1.webRTCAdapter.browserDetails.version || 0;
+    if (browser === 'chrome' && version < 72) return false;
+    if (browser === 'firefox' && version >= 59) return true;
+    if (!window.RTCRtpTransceiver || !('currentDirection' in RTCRtpTransceiver.prototype)) return false;
+    var tempPc;
+    var supported = false;
+
+    try {
+      tempPc = new RTCPeerConnection();
+      tempPc.addTransceiver('audio');
+      supported = true;
+    } catch (e) {} finally {
+      if (tempPc) {
+        tempPc.close();
+      }
+    }
+
+    return supported;
+  };
+
+  class_1.prototype.toString = function () {
+    return "Supports: \n    browser:" + this.getBrowser() + " \n    version:" + this.getVersion() + " \n    isIOS:" + this.isIOS + " \n    isWebRTCSupported:" + this.isWebRTCSupported() + " \n    isBrowserSupported:" + this.isBrowserSupported() + " \n    isUnifiedPlanSupported:" + this.isUnifiedPlanSupported();
+  };
+
+  return class_1;
+}())();
+},{"./adapter":"sXtV"}],"BHXf":[function(require,module,exports) {
+"use strict";
+
+var __importStar = this && this.__importStar || function (mod) {
+  if (mod && mod.__esModule) return mod;
+  var result = {};
+  if (mod != null) for (var k in mod) {
+    if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+  }
+  result["default"] = mod;
+  return result;
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var BinaryPack = __importStar(require("peerjs-js-binarypack"));
+
+var supports_1 = require("./supports");
+
+var DEFAULT_CONFIG = {
+  iceServers: [{
+    urls: "stun:stun.l.google.com:19302"
+  }, {
+    urls: "turn:0.peerjs.com:3478",
+    username: "peerjs",
+    credential: "peerjsp"
+  }],
+  sdpSemantics: "unified-plan"
+};
+exports.util = new (
+/** @class */
+function () {
+  function class_1() {
+    this.CLOUD_HOST = "0.peerjs.com";
+    this.CLOUD_PORT = 443; // Browsers that need chunking:
+
+    this.chunkedBrowsers = {
+      Chrome: 1,
+      chrome: 1
+    };
+    this.chunkedMTU = 16300; // The original 60000 bytes setting does not work when sending data from Firefox to Chrome, which is "cut off" after 16384 bytes and delivered individually.
+    // Returns browser-agnostic default config
+
+    this.defaultConfig = DEFAULT_CONFIG;
+    this.browser = supports_1.Supports.getBrowser();
+    this.browserVersion = supports_1.Supports.getVersion(); // Lists which features are supported
+
+    this.supports = function () {
+      var supported = {
+        browser: supports_1.Supports.isBrowserSupported(),
+        webRTC: supports_1.Supports.isWebRTCSupported(),
+        audioVideo: false,
+        data: false,
+        binaryBlob: false,
+        reliable: false
+      };
+      if (!supported.webRTC) return supported;
+      var pc;
+
+      try {
+        pc = new RTCPeerConnection(DEFAULT_CONFIG);
+        supported.audioVideo = true;
+        var dc = void 0;
+
+        try {
+          dc = pc.createDataChannel("_PEERJSTEST", {
+            ordered: true
+          });
+          supported.data = true;
+          supported.reliable = !!dc.ordered; // Binary test
+
+          try {
+            dc.binaryType = "blob";
+            supported.binaryBlob = !supports_1.Supports.isIOS;
+          } catch (e) {}
+        } catch (e) {} finally {
+          if (dc) {
+            dc.close();
+          }
+        }
+      } catch (e) {} finally {
+        if (pc) {
+          pc.close();
+        }
+      }
+
+      return supported;
+    }();
+
+    this.pack = BinaryPack.pack;
+    this.unpack = BinaryPack.unpack; // Binary stuff
+
+    this._dataCount = 1;
+  }
+
+  class_1.prototype.noop = function () {}; // Ensure alphanumeric ids
+
+
+  class_1.prototype.validateId = function (id) {
+    // Allow empty ids
+    return !id || /^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.test(id);
+  };
+
+  class_1.prototype.chunk = function (blob) {
+    var chunks = [];
+    var size = blob.size;
+    var total = Math.ceil(size / exports.util.chunkedMTU);
+    var index = 0;
+    var start = 0;
+
+    while (start < size) {
+      var end = Math.min(size, start + exports.util.chunkedMTU);
+      var b = blob.slice(start, end);
+      var chunk = {
+        __peerData: this._dataCount,
+        n: index,
+        data: b,
+        total: total
+      };
+      chunks.push(chunk);
+      start = end;
+      index++;
+    }
+
+    this._dataCount++;
+    return chunks;
+  };
+
+  class_1.prototype.blobToArrayBuffer = function (blob, cb) {
+    var fr = new FileReader();
+
+    fr.onload = function (evt) {
+      if (evt.target) {
+        cb(evt.target.result);
+      }
+    };
+
+    fr.readAsArrayBuffer(blob);
+    return fr;
+  };
+
+  class_1.prototype.binaryStringToArrayBuffer = function (binary) {
+    var byteArray = new Uint8Array(binary.length);
+
+    for (var i = 0; i < binary.length; i++) {
+      byteArray[i] = binary.charCodeAt(i) & 0xff;
+    }
+
+    return byteArray.buffer;
+  };
+
+  class_1.prototype.randomToken = function () {
+    return Math.random().toString(36).substr(2);
+  };
+
+  class_1.prototype.isSecure = function () {
+    return location.protocol === "https:";
+  };
+
+  return class_1;
+}())();
+},{"peerjs-js-binarypack":"kdPp","./supports":"I+31"}],"2JJl":[function(require,module,exports) {
+'use strict';
+
+var has = Object.prototype.hasOwnProperty
+  , prefix = '~';
+
+/**
+ * Constructor to create a storage for our `EE` objects.
+ * An `Events` instance is a plain object whose properties are event names.
+ *
+ * @constructor
+ * @private
+ */
+function Events() {}
+
+//
+// We try to not inherit from `Object.prototype`. In some engines creating an
+// instance in this way is faster than calling `Object.create(null)` directly.
+// If `Object.create(null)` is not supported we prefix the event names with a
+// character to make sure that the built-in object properties are not
+// overridden or used as an attack vector.
+//
+if (Object.create) {
+  Events.prototype = Object.create(null);
+
+  //
+  // This hack is needed because the `__proto__` property is still inherited in
+  // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.
+  //
+  if (!new Events().__proto__) prefix = false;
+}
+
+/**
+ * Representation of a single event listener.
+ *
+ * @param {Function} fn The listener function.
+ * @param {*} context The context to invoke the listener with.
+ * @param {Boolean} [once=false] Specify if the listener is a one-time listener.
+ * @constructor
+ * @private
+ */
+function EE(fn, context, once) {
+  this.fn = fn;
+  this.context = context;
+  this.once = once || false;
+}
+
+/**
+ * Add a listener for a given event.
+ *
+ * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
+ * @param {(String|Symbol)} event The event name.
+ * @param {Function} fn The listener function.
+ * @param {*} context The context to invoke the listener with.
+ * @param {Boolean} once Specify if the listener is a one-time listener.
+ * @returns {EventEmitter}
+ * @private
+ */
+function addListener(emitter, event, fn, context, once) {
+  if (typeof fn !== 'function') {
+    throw new TypeError('The listener must be a function');
+  }
+
+  var listener = new EE(fn, context || emitter, once)
+    , evt = prefix ? prefix + event : event;
+
+  if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;
+  else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);
+  else emitter._events[evt] = [emitter._events[evt], listener];
+
+  return emitter;
+}
+
+/**
+ * Clear event by name.
+ *
+ * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
+ * @param {(String|Symbol)} evt The Event name.
+ * @private
+ */
+function clearEvent(emitter, evt) {
+  if (--emitter._eventsCount === 0) emitter._events = new Events();
+  else delete emitter._events[evt];
+}
+
+/**
+ * Minimal `EventEmitter` interface that is molded against the Node.js
+ * `EventEmitter` interface.
+ *
+ * @constructor
+ * @public
+ */
+function EventEmitter() {
+  this._events = new Events();
+  this._eventsCount = 0;
+}
+
+/**
+ * Return an array listing the events for which the emitter has registered
+ * listeners.
+ *
+ * @returns {Array}
+ * @public
+ */
+EventEmitter.prototype.eventNames = function eventNames() {
+  var names = []
+    , events
+    , name;
+
+  if (this._eventsCount === 0) return names;
+
+  for (name in (events = this._events)) {
+    if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);
+  }
+
+  if (Object.getOwnPropertySymbols) {
+    return names.concat(Object.getOwnPropertySymbols(events));
+  }
+
+  return names;
+};
+
+/**
+ * Return the listeners registered for a given event.
+ *
+ * @param {(String|Symbol)} event The event name.
+ * @returns {Array} The registered listeners.
+ * @public
+ */
+EventEmitter.prototype.listeners = function listeners(event) {
+  var evt = prefix ? prefix + event : event
+    , handlers = this._events[evt];
+
+  if (!handlers) return [];
+  if (handlers.fn) return [handlers.fn];
+
+  for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {
+    ee[i] = handlers[i].fn;
+  }
+
+  return ee;
+};
+
+/**
+ * Return the number of listeners listening to a given event.
+ *
+ * @param {(String|Symbol)} event The event name.
+ * @returns {Number} The number of listeners.
+ * @public
+ */
+EventEmitter.prototype.listenerCount = function listenerCount(event) {
+  var evt = prefix ? prefix + event : event
+    , listeners = this._events[evt];
+
+  if (!listeners) return 0;
+  if (listeners.fn) return 1;
+  return listeners.length;
+};
+
+/**
+ * Calls each of the listeners registered for a given event.
+ *
+ * @param {(String|Symbol)} event The event name.
+ * @returns {Boolean} `true` if the event had listeners, else `false`.
+ * @public
+ */
+EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
+  var evt = prefix ? prefix + event : event;
+
+  if (!this._events[evt]) return false;
+
+  var listeners = this._events[evt]
+    , len = arguments.length
+    , args
+    , i;
+
+  if (listeners.fn) {
+    if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);
+
+    switch (len) {
+      case 1: return listeners.fn.call(listeners.context), true;
+      case 2: return listeners.fn.call(listeners.context, a1), true;
+      case 3: return listeners.fn.call(listeners.context, a1, a2), true;
+      case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;
+      case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
+      case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
+    }
+
+    for (i = 1, args = new Array(len -1); i < len; i++) {
+      args[i - 1] = arguments[i];
+    }
+
+    listeners.fn.apply(listeners.context, args);
+  } else {
+    var length = listeners.length
+      , j;
+
+    for (i = 0; i < length; i++) {
+      if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);
+
+      switch (len) {
+        case 1: listeners[i].fn.call(listeners[i].context); break;
+        case 2: listeners[i].fn.call(listeners[i].context, a1); break;
+        case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;
+        case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;
+        default:
+          if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {
+            args[j - 1] = arguments[j];
+          }
+
+          listeners[i].fn.apply(listeners[i].context, args);
+      }
+    }
+  }
+
+  return true;
+};
+
+/**
+ * Add a listener for a given event.
+ *
+ * @param {(String|Symbol)} event The event name.
+ * @param {Function} fn The listener function.
+ * @param {*} [context=this] The context to invoke the listener with.
+ * @returns {EventEmitter} `this`.
+ * @public
+ */
+EventEmitter.prototype.on = function on(event, fn, context) {
+  return addListener(this, event, fn, context, false);
+};
+
+/**
+ * Add a one-time listener for a given event.
+ *
+ * @param {(String|Symbol)} event The event name.
+ * @param {Function} fn The listener function.
+ * @param {*} [context=this] The context to invoke the listener with.
+ * @returns {EventEmitter} `this`.
+ * @public
+ */
+EventEmitter.prototype.once = function once(event, fn, context) {
+  return addListener(this, event, fn, context, true);
+};
+
+/**
+ * Remove the listeners of a given event.
+ *
+ * @param {(String|Symbol)} event The event name.
+ * @param {Function} fn Only remove the listeners that match this function.
+ * @param {*} context Only remove the listeners that have this context.
+ * @param {Boolean} once Only remove one-time listeners.
+ * @returns {EventEmitter} `this`.
+ * @public
+ */
+EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
+  var evt = prefix ? prefix + event : event;
+
+  if (!this._events[evt]) return this;
+  if (!fn) {
+    clearEvent(this, evt);
+    return this;
+  }
+
+  var listeners = this._events[evt];
+
+  if (listeners.fn) {
+    if (
+      listeners.fn === fn &&
+      (!once || listeners.once) &&
+      (!context || listeners.context === context)
+    ) {
+      clearEvent(this, evt);
+    }
+  } else {
+    for (var i = 0, events = [], length = listeners.length; i < length; i++) {
+      if (
+        listeners[i].fn !== fn ||
+        (once && !listeners[i].once) ||
+        (context && listeners[i].context !== context)
+      ) {
+        events.push(listeners[i]);
+      }
+    }
+
+    //
+    // Reset the array, or remove it completely if we have no more listeners.
+    //
+    if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;
+    else clearEvent(this, evt);
+  }
+
+  return this;
+};
+
+/**
+ * Remove all listeners, or those of the specified event.
+ *
+ * @param {(String|Symbol)} [event] The event name.
+ * @returns {EventEmitter} `this`.
+ * @public
+ */
+EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
+  var evt;
+
+  if (event) {
+    evt = prefix ? prefix + event : event;
+    if (this._events[evt]) clearEvent(this, evt);
+  } else {
+    this._events = new Events();
+    this._eventsCount = 0;
+  }
+
+  return this;
+};
+
+//
+// Alias methods names because people roll like that.
+//
+EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
+EventEmitter.prototype.addListener = EventEmitter.prototype.on;
+
+//
+// Expose the prefix.
+//
+EventEmitter.prefixed = prefix;
+
+//
+// Allow `EventEmitter` to be imported as module namespace.
+//
+EventEmitter.EventEmitter = EventEmitter;
+
+//
+// Expose the module.
+//
+if ('undefined' !== typeof module) {
+  module.exports = EventEmitter;
+}
+
+},{}],"8WOs":[function(require,module,exports) {
+"use strict";
+
+var __read = this && this.__read || function (o, n) {
+  var m = typeof Symbol === "function" && o[Symbol.iterator];
+  if (!m) return o;
+  var i = m.call(o),
+      r,
+      ar = [],
+      e;
+
+  try {
+    while ((n === void 0 || n-- > 0) && !(r = i.next()).done) {
+      ar.push(r.value);
+    }
+  } catch (error) {
+    e = {
+      error: error
+    };
+  } finally {
+    try {
+      if (r && !r.done && (m = i["return"])) m.call(i);
+    } finally {
+      if (e) throw e.error;
+    }
+  }
+
+  return ar;
+};
+
+var __spread = this && this.__spread || function () {
+  for (var ar = [], i = 0; i < arguments.length; i++) {
+    ar = ar.concat(__read(arguments[i]));
+  }
+
+  return ar;
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+var LOG_PREFIX = 'PeerJS: ';
+/*
+Prints log messages depending on the debug level passed in. Defaults to 0.
+0  Prints no logs.
+1  Prints only errors.
+2  Prints errors and warnings.
+3  Prints all logs.
+*/
+
+var LogLevel;
+
+(function (LogLevel) {
+  LogLevel[LogLevel["Disabled"] = 0] = "Disabled";
+  LogLevel[LogLevel["Errors"] = 1] = "Errors";
+  LogLevel[LogLevel["Warnings"] = 2] = "Warnings";
+  LogLevel[LogLevel["All"] = 3] = "All";
+})(LogLevel = exports.LogLevel || (exports.LogLevel = {}));
+
+var Logger =
+/** @class */
+function () {
+  function Logger() {
+    this._logLevel = LogLevel.Disabled;
+  }
+
+  Object.defineProperty(Logger.prototype, "logLevel", {
+    get: function get() {
+      return this._logLevel;
+    },
+    set: function set(logLevel) {
+      this._logLevel = logLevel;
+    },
+    enumerable: true,
+    configurable: true
+  });
+
+  Logger.prototype.log = function () {
+    var args = [];
+
+    for (var _i = 0; _i < arguments.length; _i++) {
+      args[_i] = arguments[_i];
+    }
+
+    if (this._logLevel >= LogLevel.All) {
+      this._print.apply(this, __spread([LogLevel.All], args));
+    }
+  };
+
+  Logger.prototype.warn = function () {
+    var args = [];
+
+    for (var _i = 0; _i < arguments.length; _i++) {
+      args[_i] = arguments[_i];
+    }
+
+    if (this._logLevel >= LogLevel.Warnings) {
+      this._print.apply(this, __spread([LogLevel.Warnings], args));
+    }
+  };
+
+  Logger.prototype.error = function () {
+    var args = [];
+
+    for (var _i = 0; _i < arguments.length; _i++) {
+      args[_i] = arguments[_i];
+    }
+
+    if (this._logLevel >= LogLevel.Errors) {
+      this._print.apply(this, __spread([LogLevel.Errors], args));
+    }
+  };
+
+  Logger.prototype.setLogFunction = function (fn) {
+    this._print = fn;
+  };
+
+  Logger.prototype._print = function (logLevel) {
+    var rest = [];
+
+    for (var _i = 1; _i < arguments.length; _i++) {
+      rest[_i - 1] = arguments[_i];
+    }
+
+    var copy = __spread([LOG_PREFIX], rest);
+
+    for (var i in copy) {
+      if (copy[i] instanceof Error) {
+        copy[i] = "(" + copy[i].name + ") " + copy[i].message;
+      }
+    }
+
+    if (logLevel >= LogLevel.All) {
+      console.log.apply(console, __spread(copy));
+    } else if (logLevel >= LogLevel.Warnings) {
+      console.warn.apply(console, __spread(["WARNING"], copy));
+    } else if (logLevel >= LogLevel.Errors) {
+      console.error.apply(console, __spread(["ERROR"], copy));
+    }
+  };
+
+  return Logger;
+}();
+
+exports.default = new Logger();
+},{}],"9ZRY":[function(require,module,exports) {
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+var ConnectionEventType;
+
+(function (ConnectionEventType) {
+  ConnectionEventType["Open"] = "open";
+  ConnectionEventType["Stream"] = "stream";
+  ConnectionEventType["Data"] = "data";
+  ConnectionEventType["Close"] = "close";
+  ConnectionEventType["Error"] = "error";
+  ConnectionEventType["IceStateChanged"] = "iceStateChanged";
+})(ConnectionEventType = exports.ConnectionEventType || (exports.ConnectionEventType = {}));
+
+var ConnectionType;
+
+(function (ConnectionType) {
+  ConnectionType["Data"] = "data";
+  ConnectionType["Media"] = "media";
+})(ConnectionType = exports.ConnectionType || (exports.ConnectionType = {}));
+
+var PeerEventType;
+
+(function (PeerEventType) {
+  PeerEventType["Open"] = "open";
+  PeerEventType["Close"] = "close";
+  PeerEventType["Connection"] = "connection";
+  PeerEventType["Call"] = "call";
+  PeerEventType["Disconnected"] = "disconnected";
+  PeerEventType["Error"] = "error";
+})(PeerEventType = exports.PeerEventType || (exports.PeerEventType = {}));
+
+var PeerErrorType;
+
+(function (PeerErrorType) {
+  PeerErrorType["BrowserIncompatible"] = "browser-incompatible";
+  PeerErrorType["Disconnected"] = "disconnected";
+  PeerErrorType["InvalidID"] = "invalid-id";
+  PeerErrorType["InvalidKey"] = "invalid-key";
+  PeerErrorType["Network"] = "network";
+  PeerErrorType["PeerUnavailable"] = "peer-unavailable";
+  PeerErrorType["SslUnavailable"] = "ssl-unavailable";
+  PeerErrorType["ServerError"] = "server-error";
+  PeerErrorType["SocketError"] = "socket-error";
+  PeerErrorType["SocketClosed"] = "socket-closed";
+  PeerErrorType["UnavailableID"] = "unavailable-id";
+  PeerErrorType["WebRTC"] = "webrtc";
+})(PeerErrorType = exports.PeerErrorType || (exports.PeerErrorType = {}));
+
+var SerializationType;
+
+(function (SerializationType) {
+  SerializationType["Binary"] = "binary";
+  SerializationType["BinaryUTF8"] = "binary-utf8";
+  SerializationType["JSON"] = "json";
+})(SerializationType = exports.SerializationType || (exports.SerializationType = {}));
+
+var SocketEventType;
+
+(function (SocketEventType) {
+  SocketEventType["Message"] = "message";
+  SocketEventType["Disconnected"] = "disconnected";
+  SocketEventType["Error"] = "error";
+  SocketEventType["Close"] = "close";
+})(SocketEventType = exports.SocketEventType || (exports.SocketEventType = {}));
+
+var ServerMessageType;
+
+(function (ServerMessageType) {
+  ServerMessageType["Heartbeat"] = "HEARTBEAT";
+  ServerMessageType["Candidate"] = "CANDIDATE";
+  ServerMessageType["Offer"] = "OFFER";
+  ServerMessageType["Answer"] = "ANSWER";
+  ServerMessageType["Open"] = "OPEN";
+  ServerMessageType["Error"] = "ERROR";
+  ServerMessageType["IdTaken"] = "ID-TAKEN";
+  ServerMessageType["InvalidKey"] = "INVALID-KEY";
+  ServerMessageType["Leave"] = "LEAVE";
+  ServerMessageType["Expire"] = "EXPIRE"; // The offer sent to a peer has expired without response.
+})(ServerMessageType = exports.ServerMessageType || (exports.ServerMessageType = {}));
+},{}],"wJlv":[function(require,module,exports) {
+"use strict";
+
+var __extends = this && this.__extends || function () {
+  var _extendStatics = function extendStatics(d, b) {
+    _extendStatics = Object.setPrototypeOf || {
+      __proto__: []
+    } instanceof Array && function (d, b) {
+      d.__proto__ = b;
+    } || function (d, b) {
+      for (var p in b) {
+        if (b.hasOwnProperty(p)) d[p] = b[p];
+      }
+    };
+
+    return _extendStatics(d, b);
+  };
+
+  return function (d, b) {
+    _extendStatics(d, b);
+
+    function __() {
+      this.constructor = d;
+    }
+
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+  };
+}();
+
+var __read = this && this.__read || function (o, n) {
+  var m = typeof Symbol === "function" && o[Symbol.iterator];
+  if (!m) return o;
+  var i = m.call(o),
+      r,
+      ar = [],
+      e;
+
+  try {
+    while ((n === void 0 || n-- > 0) && !(r = i.next()).done) {
+      ar.push(r.value);
+    }
+  } catch (error) {
+    e = {
+      error: error
+    };
+  } finally {
+    try {
+      if (r && !r.done && (m = i["return"])) m.call(i);
+    } finally {
+      if (e) throw e.error;
+    }
+  }
+
+  return ar;
+};
+
+var __spread = this && this.__spread || function () {
+  for (var ar = [], i = 0; i < arguments.length; i++) {
+    ar = ar.concat(__read(arguments[i]));
+  }
+
+  return ar;
+};
+
+var __values = this && this.__values || function (o) {
+  var s = typeof Symbol === "function" && Symbol.iterator,
+      m = s && o[s],
+      i = 0;
+  if (m) return m.call(o);
+  if (o && typeof o.length === "number") return {
+    next: function next() {
+      if (o && i >= o.length) o = void 0;
+      return {
+        value: o && o[i++],
+        done: !o
+      };
+    }
+  };
+  throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
+};
+
+var __importDefault = this && this.__importDefault || function (mod) {
+  return mod && mod.__esModule ? mod : {
+    "default": mod
+  };
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var eventemitter3_1 = require("eventemitter3");
+
+var logger_1 = __importDefault(require("./logger"));
+
+var enums_1 = require("./enums");
+/**
+ * An abstraction on top of WebSockets to provide fastest
+ * possible connection for peers.
+ */
+
+
+var Socket =
+/** @class */
+function (_super) {
+  __extends(Socket, _super);
+
+  function Socket(secure, host, port, path, key, pingInterval) {
+    if (pingInterval === void 0) {
+      pingInterval = 5000;
+    }
+
+    var _this = _super.call(this) || this;
+
+    _this.pingInterval = pingInterval;
+    _this._disconnected = false;
+    _this._messagesQueue = [];
+    var wsProtocol = secure ? "wss://" : "ws://";
+    _this._wsUrl = wsProtocol + host + ":" + port + path + "peerjs?key=" + key;
+    return _this;
+  }
+  /** Check in with ID or get one from server. */
+
+
+  Socket.prototype.start = function (id, token) {
+    this._id = id;
+    this._wsUrl += "&id=" + id + "&token=" + token;
+
+    this._startWebSocket();
+  };
+  /** Start up websocket communications. */
+
+
+  Socket.prototype._startWebSocket = function () {
+    var _this = this;
+
+    if (this._socket) {
+      return;
+    }
+
+    this._socket = new WebSocket(this._wsUrl);
+
+    this._socket.onmessage = function (event) {
+      var data;
+
+      try {
+        data = JSON.parse(event.data);
+        logger_1.default.log("Server message received:", data);
+      } catch (e) {
+        logger_1.default.log("Invalid server message", event.data);
+        return;
+      }
+
+      _this.emit(enums_1.SocketEventType.Message, data);
+    };
+
+    this._socket.onclose = function (event) {
+      logger_1.default.log("Socket closed.", event);
+      _this._disconnected = true;
+      clearTimeout(_this._wsPingTimer);
+
+      _this.emit(enums_1.SocketEventType.Disconnected);
+    }; // Take care of the queue of connections if necessary and make sure Peer knows
+    // socket is open.
+
+
+    this._socket.onopen = function () {
+      if (_this._disconnected) return;
+
+      _this._sendQueuedMessages();
+
+      logger_1.default.log("Socket open");
+
+      _this._scheduleHeartbeat();
+    };
+  };
+
+  Socket.prototype._scheduleHeartbeat = function () {
+    var _this = this;
+
+    this._wsPingTimer = setTimeout(function () {
+      _this._sendHeartbeat();
+    }, this.pingInterval);
+  };
+
+  Socket.prototype._sendHeartbeat = function () {
+    if (!this._wsOpen()) {
+      logger_1.default.log("Cannot send heartbeat, because socket closed");
+      return;
+    }
+
+    var message = JSON.stringify({
+      type: enums_1.ServerMessageType.Heartbeat
+    });
+
+    this._socket.send(message);
+
+    this._scheduleHeartbeat();
+  };
+  /** Is the websocket currently open? */
+
+
+  Socket.prototype._wsOpen = function () {
+    return !!this._socket && this._socket.readyState === 1;
+  };
+  /** Send queued messages. */
+
+
+  Socket.prototype._sendQueuedMessages = function () {
+    var e_1, _a; //Create copy of queue and clear it,
+    //because send method push the message back to queue if smth will go wrong
+
+
+    var copiedQueue = __spread(this._messagesQueue);
+
+    this._messagesQueue = [];
+
+    try {
+      for (var copiedQueue_1 = __values(copiedQueue), copiedQueue_1_1 = copiedQueue_1.next(); !copiedQueue_1_1.done; copiedQueue_1_1 = copiedQueue_1.next()) {
+        var message = copiedQueue_1_1.value;
+        this.send(message);
+      }
+    } catch (e_1_1) {
+      e_1 = {
+        error: e_1_1
+      };
+    } finally {
+      try {
+        if (copiedQueue_1_1 && !copiedQueue_1_1.done && (_a = copiedQueue_1.return)) _a.call(copiedQueue_1);
+      } finally {
+        if (e_1) throw e_1.error;
+      }
+    }
+  };
+  /** Exposed send for DC & Peer. */
+
+
+  Socket.prototype.send = function (data) {
+    if (this._disconnected) {
+      return;
+    } // If we didn't get an ID yet, we can't yet send anything so we should queue
+    // up these messages.
+
+
+    if (!this._id) {
+      this._messagesQueue.push(data);
+
+      return;
+    }
+
+    if (!data.type) {
+      this.emit(enums_1.SocketEventType.Error, "Invalid message");
+      return;
+    }
+
+    if (!this._wsOpen()) {
+      return;
+    }
+
+    var message = JSON.stringify(data);
+
+    this._socket.send(message);
+  };
+
+  Socket.prototype.close = function () {
+    if (!this._disconnected && !!this._socket) {
+      this._socket.close();
+
+      this._disconnected = true;
+      clearTimeout(this._wsPingTimer);
+    }
+  };
+
+  return Socket;
+}(eventemitter3_1.EventEmitter);
+
+exports.Socket = Socket;
+},{"eventemitter3":"2JJl","./logger":"8WOs","./enums":"9ZRY"}],"HCdX":[function(require,module,exports) {
+"use strict";
+
+var __assign = this && this.__assign || function () {
+  __assign = Object.assign || function (t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+      s = arguments[i];
+
+      for (var p in s) {
+        if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
+      }
+    }
+
+    return t;
+  };
+
+  return __assign.apply(this, arguments);
+};
+
+var __awaiter = this && this.__awaiter || function (thisArg, _arguments, P, generator) {
+  function adopt(value) {
+    return value instanceof P ? value : new P(function (resolve) {
+      resolve(value);
+    });
+  }
+
+  return new (P || (P = Promise))(function (resolve, reject) {
+    function fulfilled(value) {
+      try {
+        step(generator.next(value));
+      } catch (e) {
+        reject(e);
+      }
+    }
+
+    function rejected(value) {
+      try {
+        step(generator["throw"](value));
+      } catch (e) {
+        reject(e);
+      }
+    }
+
+    function step(result) {
+      result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected);
+    }
+
+    step((generator = generator.apply(thisArg, _arguments || [])).next());
+  });
+};
+
+var __generator = this && this.__generator || function (thisArg, body) {
+  var _ = {
+    label: 0,
+    sent: function sent() {
+      if (t[0] & 1) throw t[1];
+      return t[1];
+    },
+    trys: [],
+    ops: []
+  },
+      f,
+      y,
+      t,
+      g;
+  return g = {
+    next: verb(0),
+    "throw": verb(1),
+    "return": verb(2)
+  }, typeof Symbol === "function" && (g[Symbol.iterator] = function () {
+    return this;
+  }), g;
+
+  function verb(n) {
+    return function (v) {
+      return step([n, v]);
+    };
+  }
+
+  function step(op) {
+    if (f) throw new TypeError("Generator is already executing.");
+
+    while (_) {
+      try {
+        if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
+        if (y = 0, t) op = [op[0] & 2, t.value];
+
+        switch (op[0]) {
+          case 0:
+          case 1:
+            t = op;
+            break;
+
+          case 4:
+            _.label++;
+            return {
+              value: op[1],
+              done: false
+            };
+
+          case 5:
+            _.label++;
+            y = op[1];
+            op = [0];
+            continue;
+
+          case 7:
+            op = _.ops.pop();
+
+            _.trys.pop();
+
+            continue;
+
+          default:
+            if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) {
+              _ = 0;
+              continue;
+            }
+
+            if (op[0] === 3 && (!t || op[1] > t[0] && op[1] < t[3])) {
+              _.label = op[1];
+              break;
+            }
+
+            if (op[0] === 6 && _.label < t[1]) {
+              _.label = t[1];
+              t = op;
+              break;
+            }
+
+            if (t && _.label < t[2]) {
+              _.label = t[2];
+
+              _.ops.push(op);
+
+              break;
+            }
+
+            if (t[2]) _.ops.pop();
+
+            _.trys.pop();
+
+            continue;
+        }
+
+        op = body.call(thisArg, _);
+      } catch (e) {
+        op = [6, e];
+        y = 0;
+      } finally {
+        f = t = 0;
+      }
+    }
+
+    if (op[0] & 5) throw op[1];
+    return {
+      value: op[0] ? op[1] : void 0,
+      done: true
+    };
+  }
+};
+
+var __importDefault = this && this.__importDefault || function (mod) {
+  return mod && mod.__esModule ? mod : {
+    "default": mod
+  };
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var util_1 = require("./util");
+
+var logger_1 = __importDefault(require("./logger"));
+
+var enums_1 = require("./enums");
+/**
+ * Manages all negotiations between Peers.
+ */
+
+
+var Negotiator =
+/** @class */
+function () {
+  function Negotiator(connection) {
+    this.connection = connection;
+  }
+  /** Returns a PeerConnection object set up correctly (for data, media). */
+
+
+  Negotiator.prototype.startConnection = function (options) {
+    var peerConnection = this._startPeerConnection(); // Set the connection's PC.
+
+
+    this.connection.peerConnection = peerConnection;
+
+    if (this.connection.type === enums_1.ConnectionType.Media && options._stream) {
+      this._addTracksToConnection(options._stream, peerConnection);
+    } // What do we need to do now?
+
+
+    if (options.originator) {
+      if (this.connection.type === enums_1.ConnectionType.Data) {
+        var dataConnection = this.connection;
+        var config = {
+          ordered: !!options.reliable
+        };
+        var dataChannel = peerConnection.createDataChannel(dataConnection.label, config);
+        dataConnection.initialize(dataChannel);
+      }
+
+      this._makeOffer();
+    } else {
+      this.handleSDP("OFFER", options.sdp);
+    }
+  };
+  /** Start a PC. */
+
+
+  Negotiator.prototype._startPeerConnection = function () {
+    logger_1.default.log("Creating RTCPeerConnection.");
+    var peerConnection = new RTCPeerConnection(this.connection.provider.options.config);
+
+    this._setupListeners(peerConnection);
+
+    return peerConnection;
+  };
+  /** Set up various WebRTC listeners. */
+
+
+  Negotiator.prototype._setupListeners = function (peerConnection) {
+    var _this = this;
+
+    var peerId = this.connection.peer;
+    var connectionId = this.connection.connectionId;
+    var connectionType = this.connection.type;
+    var provider = this.connection.provider; // ICE CANDIDATES.
+
+    logger_1.default.log("Listening for ICE candidates.");
+
+    peerConnection.onicecandidate = function (evt) {
+      if (!evt.candidate || !evt.candidate.candidate) return;
+      logger_1.default.log("Received ICE candidates for " + peerId + ":", evt.candidate);
+      provider.socket.send({
+        type: enums_1.ServerMessageType.Candidate,
+        payload: {
+          candidate: evt.candidate,
+          type: connectionType,
+          connectionId: connectionId
+        },
+        dst: peerId
+      });
+    };
+
+    peerConnection.oniceconnectionstatechange = function () {
+      switch (peerConnection.iceConnectionState) {
+        case "failed":
+          logger_1.default.log("iceConnectionState is failed, closing connections to " + peerId);
+
+          _this.connection.emit(enums_1.ConnectionEventType.Error, new Error("Negotiation of connection to " + peerId + " failed."));
+
+          _this.connection.close();
+
+          break;
+
+        case "closed":
+          logger_1.default.log("iceConnectionState is closed, closing connections to " + peerId);
+
+          _this.connection.emit(enums_1.ConnectionEventType.Error, new Error("Connection to " + peerId + " closed."));
+
+          _this.connection.close();
+
+          break;
+
+        case "disconnected":
+          logger_1.default.log("iceConnectionState is disconnected, closing connections to " + peerId);
+
+          _this.connection.emit(enums_1.ConnectionEventType.Error, new Error("Connection to " + peerId + " disconnected."));
+
+          _this.connection.close();
+
+          break;
+
+        case "completed":
+          peerConnection.onicecandidate = util_1.util.noop;
+          break;
+      }
+
+      _this.connection.emit(enums_1.ConnectionEventType.IceStateChanged, peerConnection.iceConnectionState);
+    }; // DATACONNECTION.
+
+
+    logger_1.default.log("Listening for data channel"); // Fired between offer and answer, so options should already be saved
+    // in the options hash.
+
+    peerConnection.ondatachannel = function (evt) {
+      logger_1.default.log("Received data channel");
+      var dataChannel = evt.channel;
+      var connection = provider.getConnection(peerId, connectionId);
+      connection.initialize(dataChannel);
+    }; // MEDIACONNECTION.
+
+
+    logger_1.default.log("Listening for remote stream");
+
+    peerConnection.ontrack = function (evt) {
+      logger_1.default.log("Received remote stream");
+      var stream = evt.streams[0];
+      var connection = provider.getConnection(peerId, connectionId);
+
+      if (connection.type === enums_1.ConnectionType.Media) {
+        var mediaConnection = connection;
+
+        _this._addStreamToMediaConnection(stream, mediaConnection);
+      }
+    };
+  };
+
+  Negotiator.prototype.cleanup = function () {
+    logger_1.default.log("Cleaning up PeerConnection to " + this.connection.peer);
+    var peerConnection = this.connection.peerConnection;
+
+    if (!peerConnection) {
+      return;
+    }
+
+    this.connection.peerConnection = null; //unsubscribe from all PeerConnection's events
+
+    peerConnection.onicecandidate = peerConnection.oniceconnectionstatechange = peerConnection.ondatachannel = peerConnection.ontrack = function () {};
+
+    var peerConnectionNotClosed = peerConnection.signalingState !== "closed";
+    var dataChannelNotClosed = false;
+
+    if (this.connection.type === enums_1.ConnectionType.Data) {
+      var dataConnection = this.connection;
+      var dataChannel = dataConnection.dataChannel;
+
+      if (dataChannel) {
+        dataChannelNotClosed = !!dataChannel.readyState && dataChannel.readyState !== "closed";
+      }
+    }
+
+    if (peerConnectionNotClosed || dataChannelNotClosed) {
+      peerConnection.close();
+    }
+  };
+
+  Negotiator.prototype._makeOffer = function () {
+    return __awaiter(this, void 0, Promise, function () {
+      var peerConnection, provider, offer, payload, dataConnection, err_2, err_1_1;
+      return __generator(this, function (_a) {
+        switch (_a.label) {
+          case 0:
+            peerConnection = this.connection.peerConnection;
+            provider = this.connection.provider;
+            _a.label = 1;
+
+          case 1:
+            _a.trys.push([1, 7,, 8]);
+
+            return [4
+            /*yield*/
+            , peerConnection.createOffer(this.connection.options.constraints)];
+
+          case 2:
+            offer = _a.sent();
+            logger_1.default.log("Created offer.");
+
+            if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {
+              offer.sdp = this.connection.options.sdpTransform(offer.sdp) || offer.sdp;
+            }
+
+            _a.label = 3;
+
+          case 3:
+            _a.trys.push([3, 5,, 6]);
+
+            return [4
+            /*yield*/
+            , peerConnection.setLocalDescription(offer)];
+
+          case 4:
+            _a.sent();
+
+            logger_1.default.log("Set localDescription:", offer, "for:" + this.connection.peer);
+            payload = {
+              sdp: offer,
+              type: this.connection.type,
+              connectionId: this.connection.connectionId,
+              metadata: this.connection.metadata,
+              browser: util_1.util.browser
+            };
+
+            if (this.connection.type === enums_1.ConnectionType.Data) {
+              dataConnection = this.connection;
+              payload = __assign(__assign({}, payload), {
+                label: dataConnection.label,
+                reliable: dataConnection.reliable,
+                serialization: dataConnection.serialization
+              });
+            }
+
+            provider.socket.send({
+              type: enums_1.ServerMessageType.Offer,
+              payload: payload,
+              dst: this.connection.peer
+            });
+            return [3
+            /*break*/
+            , 6];
+
+          case 5:
+            err_2 = _a.sent(); // TODO: investigate why _makeOffer is being called from the answer
+
+            if (err_2 != "OperationError: Failed to set local offer sdp: Called in wrong state: kHaveRemoteOffer") {
+              provider.emitError(enums_1.PeerErrorType.WebRTC, err_2);
+              logger_1.default.log("Failed to setLocalDescription, ", err_2);
+            }
+
+            return [3
+            /*break*/
+            , 6];
+
+          case 6:
+            return [3
+            /*break*/
+            , 8];
+
+          case 7:
+            err_1_1 = _a.sent();
+            provider.emitError(enums_1.PeerErrorType.WebRTC, err_1_1);
+            logger_1.default.log("Failed to createOffer, ", err_1_1);
+            return [3
+            /*break*/
+            , 8];
+
+          case 8:
+            return [2
+            /*return*/
+            ];
+        }
+      });
+    });
+  };
+
+  Negotiator.prototype._makeAnswer = function () {
+    return __awaiter(this, void 0, Promise, function () {
+      var peerConnection, provider, answer, err_3, err_1_2;
+      return __generator(this, function (_a) {
+        switch (_a.label) {
+          case 0:
+            peerConnection = this.connection.peerConnection;
+            provider = this.connection.provider;
+            _a.label = 1;
+
+          case 1:
+            _a.trys.push([1, 7,, 8]);
+
+            return [4
+            /*yield*/
+            , peerConnection.createAnswer()];
+
+          case 2:
+            answer = _a.sent();
+            logger_1.default.log("Created answer.");
+
+            if (this.connection.options.sdpTransform && typeof this.connection.options.sdpTransform === 'function') {
+              answer.sdp = this.connection.options.sdpTransform(answer.sdp) || answer.sdp;
+            }
+
+            _a.label = 3;
+
+          case 3:
+            _a.trys.push([3, 5,, 6]);
+
+            return [4
+            /*yield*/
+            , peerConnection.setLocalDescription(answer)];
+
+          case 4:
+            _a.sent();
+
+            logger_1.default.log("Set localDescription:", answer, "for:" + this.connection.peer);
+            provider.socket.send({
+              type: enums_1.ServerMessageType.Answer,
+              payload: {
+                sdp: answer,
+                type: this.connection.type,
+                connectionId: this.connection.connectionId,
+                browser: util_1.util.browser
+              },
+              dst: this.connection.peer
+            });
+            return [3
+            /*break*/
+            , 6];
+
+          case 5:
+            err_3 = _a.sent();
+            provider.emitError(enums_1.PeerErrorType.WebRTC, err_3);
+            logger_1.default.log("Failed to setLocalDescription, ", err_3);
+            return [3
+            /*break*/
+            , 6];
+
+          case 6:
+            return [3
+            /*break*/
+            , 8];
+
+          case 7:
+            err_1_2 = _a.sent();
+            provider.emitError(enums_1.PeerErrorType.WebRTC, err_1_2);
+            logger_1.default.log("Failed to create answer, ", err_1_2);
+            return [3
+            /*break*/
+            , 8];
+
+          case 8:
+            return [2
+            /*return*/
+            ];
+        }
+      });
+    });
+  };
+  /** Handle an SDP. */
+
+
+  Negotiator.prototype.handleSDP = function (type, sdp) {
+    return __awaiter(this, void 0, Promise, function () {
+      var peerConnection, provider, self, err_4;
+      return __generator(this, function (_a) {
+        switch (_a.label) {
+          case 0:
+            sdp = new RTCSessionDescription(sdp);
+            peerConnection = this.connection.peerConnection;
+            provider = this.connection.provider;
+            logger_1.default.log("Setting remote description", sdp);
+            self = this;
+            _a.label = 1;
+
+          case 1:
+            _a.trys.push([1, 5,, 6]);
+
+            return [4
+            /*yield*/
+            , peerConnection.setRemoteDescription(sdp)];
+
+          case 2:
+            _a.sent();
+
+            logger_1.default.log("Set remoteDescription:" + type + " for:" + this.connection.peer);
+            if (!(type === "OFFER")) return [3
+            /*break*/
+            , 4];
+            return [4
+            /*yield*/
+            , self._makeAnswer()];
+
+          case 3:
+            _a.sent();
+
+            _a.label = 4;
+
+          case 4:
+            return [3
+            /*break*/
+            , 6];
+
+          case 5:
+            err_4 = _a.sent();
+            provider.emitError(enums_1.PeerErrorType.WebRTC, err_4);
+            logger_1.default.log("Failed to setRemoteDescription, ", err_4);
+            return [3
+            /*break*/
+            , 6];
+
+          case 6:
+            return [2
+            /*return*/
+            ];
+        }
+      });
+    });
+  };
+  /** Handle a candidate. */
+
+
+  Negotiator.prototype.handleCandidate = function (ice) {
+    return __awaiter(this, void 0, Promise, function () {
+      var candidate, sdpMLineIndex, sdpMid, peerConnection, provider, err_5;
+      return __generator(this, function (_a) {
+        switch (_a.label) {
+          case 0:
+            logger_1.default.log("handleCandidate:", ice);
+            candidate = ice.candidate;
+            sdpMLineIndex = ice.sdpMLineIndex;
+            sdpMid = ice.sdpMid;
+            peerConnection = this.connection.peerConnection;
+            provider = this.connection.provider;
+            _a.label = 1;
+
+          case 1:
+            _a.trys.push([1, 3,, 4]);
+
+            return [4
+            /*yield*/
+            , peerConnection.addIceCandidate(new RTCIceCandidate({
+              sdpMid: sdpMid,
+              sdpMLineIndex: sdpMLineIndex,
+              candidate: candidate
+            }))];
+
+          case 2:
+            _a.sent();
+
+            logger_1.default.log("Added ICE candidate for:" + this.connection.peer);
+            return [3
+            /*break*/
+            , 4];
+
+          case 3:
+            err_5 = _a.sent();
+            provider.emitError(enums_1.PeerErrorType.WebRTC, err_5);
+            logger_1.default.log("Failed to handleCandidate, ", err_5);
+            return [3
+            /*break*/
+            , 4];
+
+          case 4:
+            return [2
+            /*return*/
+            ];
+        }
+      });
+    });
+  };
+
+  Negotiator.prototype._addTracksToConnection = function (stream, peerConnection) {
+    logger_1.default.log("add tracks from stream " + stream.id + " to peer connection");
+
+    if (!peerConnection.addTrack) {
+      return logger_1.default.error("Your browser does't support RTCPeerConnection#addTrack. Ignored.");
+    }
+
+    stream.getTracks().forEach(function (track) {
+      peerConnection.addTrack(track, stream);
+    });
+  };
+
+  Negotiator.prototype._addStreamToMediaConnection = function (stream, mediaConnection) {
+    logger_1.default.log("add stream " + stream.id + " to media connection " + mediaConnection.connectionId);
+    mediaConnection.addStream(stream);
+  };
+
+  return Negotiator;
+}();
+
+exports.Negotiator = Negotiator;
+},{"./util":"BHXf","./logger":"8WOs","./enums":"9ZRY"}],"tQFK":[function(require,module,exports) {
+"use strict";
+
+var __extends = this && this.__extends || function () {
+  var _extendStatics = function extendStatics(d, b) {
+    _extendStatics = Object.setPrototypeOf || {
+      __proto__: []
+    } instanceof Array && function (d, b) {
+      d.__proto__ = b;
+    } || function (d, b) {
+      for (var p in b) {
+        if (b.hasOwnProperty(p)) d[p] = b[p];
+      }
+    };
+
+    return _extendStatics(d, b);
+  };
+
+  return function (d, b) {
+    _extendStatics(d, b);
+
+    function __() {
+      this.constructor = d;
+    }
+
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+  };
+}();
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var eventemitter3_1 = require("eventemitter3");
+
+var BaseConnection =
+/** @class */
+function (_super) {
+  __extends(BaseConnection, _super);
+
+  function BaseConnection(peer, provider, options) {
+    var _this = _super.call(this) || this;
+
+    _this.peer = peer;
+    _this.provider = provider;
+    _this.options = options;
+    _this._open = false;
+    _this.metadata = options.metadata;
+    return _this;
+  }
+
+  Object.defineProperty(BaseConnection.prototype, "open", {
+    get: function get() {
+      return this._open;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  return BaseConnection;
+}(eventemitter3_1.EventEmitter);
+
+exports.BaseConnection = BaseConnection;
+},{"eventemitter3":"2JJl"}],"dbHP":[function(require,module,exports) {
+"use strict";
+
+var __extends = this && this.__extends || function () {
+  var _extendStatics = function extendStatics(d, b) {
+    _extendStatics = Object.setPrototypeOf || {
+      __proto__: []
+    } instanceof Array && function (d, b) {
+      d.__proto__ = b;
+    } || function (d, b) {
+      for (var p in b) {
+        if (b.hasOwnProperty(p)) d[p] = b[p];
+      }
+    };
+
+    return _extendStatics(d, b);
+  };
+
+  return function (d, b) {
+    _extendStatics(d, b);
+
+    function __() {
+      this.constructor = d;
+    }
+
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+  };
+}();
+
+var __assign = this && this.__assign || function () {
+  __assign = Object.assign || function (t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+      s = arguments[i];
+
+      for (var p in s) {
+        if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
+      }
+    }
+
+    return t;
+  };
+
+  return __assign.apply(this, arguments);
+};
+
+var __values = this && this.__values || function (o) {
+  var s = typeof Symbol === "function" && Symbol.iterator,
+      m = s && o[s],
+      i = 0;
+  if (m) return m.call(o);
+  if (o && typeof o.length === "number") return {
+    next: function next() {
+      if (o && i >= o.length) o = void 0;
+      return {
+        value: o && o[i++],
+        done: !o
+      };
+    }
+  };
+  throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
+};
+
+var __importDefault = this && this.__importDefault || function (mod) {
+  return mod && mod.__esModule ? mod : {
+    "default": mod
+  };
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var util_1 = require("./util");
+
+var logger_1 = __importDefault(require("./logger"));
+
+var negotiator_1 = require("./negotiator");
+
+var enums_1 = require("./enums");
+
+var baseconnection_1 = require("./baseconnection");
+/**
+ * Wraps the streaming interface between two Peers.
+ */
+
+
+var MediaConnection =
+/** @class */
+function (_super) {
+  __extends(MediaConnection, _super);
+
+  function MediaConnection(peerId, provider, options) {
+    var _this = _super.call(this, peerId, provider, options) || this;
+
+    _this._localStream = _this.options._stream;
+    _this.connectionId = _this.options.connectionId || MediaConnection.ID_PREFIX + util_1.util.randomToken();
+    _this._negotiator = new negotiator_1.Negotiator(_this);
+
+    if (_this._localStream) {
+      _this._negotiator.startConnection({
+        _stream: _this._localStream,
+        originator: true
+      });
+    }
+
+    return _this;
+  }
+
+  Object.defineProperty(MediaConnection.prototype, "type", {
+    get: function get() {
+      return enums_1.ConnectionType.Media;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(MediaConnection.prototype, "localStream", {
+    get: function get() {
+      return this._localStream;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(MediaConnection.prototype, "remoteStream", {
+    get: function get() {
+      return this._remoteStream;
+    },
+    enumerable: true,
+    configurable: true
+  });
+
+  MediaConnection.prototype.addStream = function (remoteStream) {
+    logger_1.default.log("Receiving stream", remoteStream);
+    this._remoteStream = remoteStream;
+
+    _super.prototype.emit.call(this, enums_1.ConnectionEventType.Stream, remoteStream); // Should we call this `open`?
+
+  };
+
+  MediaConnection.prototype.handleMessage = function (message) {
+    var type = message.type;
+    var payload = message.payload;
+
+    switch (message.type) {
+      case enums_1.ServerMessageType.Answer:
+        // Forward to negotiator
+        this._negotiator.handleSDP(type, payload.sdp);
+
+        this._open = true;
+        break;
+
+      case enums_1.ServerMessageType.Candidate:
+        this._negotiator.handleCandidate(payload.candidate);
+
+        break;
+
+      default:
+        logger_1.default.warn("Unrecognized message type:" + type + " from peer:" + this.peer);
+        break;
+    }
+  };
+
+  MediaConnection.prototype.answer = function (stream, options) {
+    var e_1, _a;
+
+    if (options === void 0) {
+      options = {};
+    }
+
+    if (this._localStream) {
+      logger_1.default.warn("Local stream already exists on this MediaConnection. Are you answering a call twice?");
+      return;
+    }
+
+    this._localStream = stream;
+
+    if (options && options.sdpTransform) {
+      this.options.sdpTransform = options.sdpTransform;
+    }
+
+    this._negotiator.startConnection(__assign(__assign({}, this.options._payload), {
+      _stream: stream
+    })); // Retrieve lost messages stored because PeerConnection not set up.
+
+
+    var messages = this.provider._getMessages(this.connectionId);
+
+    try {
+      for (var messages_1 = __values(messages), messages_1_1 = messages_1.next(); !messages_1_1.done; messages_1_1 = messages_1.next()) {
+        var message = messages_1_1.value;
+        this.handleMessage(message);
+      }
+    } catch (e_1_1) {
+      e_1 = {
+        error: e_1_1
+      };
+    } finally {
+      try {
+        if (messages_1_1 && !messages_1_1.done && (_a = messages_1.return)) _a.call(messages_1);
+      } finally {
+        if (e_1) throw e_1.error;
+      }
+    }
+
+    this._open = true;
+  };
+  /**
+   * Exposed functionality for users.
+   */
+
+  /** Allows user to close connection. */
+
+
+  MediaConnection.prototype.close = function () {
+    if (this._negotiator) {
+      this._negotiator.cleanup();
+
+      this._negotiator = null;
+    }
+
+    this._localStream = null;
+    this._remoteStream = null;
+
+    if (this.provider) {
+      this.provider._removeConnection(this);
+
+      this.provider = null;
+    }
+
+    if (this.options && this.options._stream) {
+      this.options._stream = null;
+    }
+
+    if (!this.open) {
+      return;
+    }
+
+    this._open = false;
+
+    _super.prototype.emit.call(this, enums_1.ConnectionEventType.Close);
+  };
+
+  MediaConnection.ID_PREFIX = "mc_";
+  return MediaConnection;
+}(baseconnection_1.BaseConnection);
+
+exports.MediaConnection = MediaConnection;
+},{"./util":"BHXf","./logger":"8WOs","./negotiator":"HCdX","./enums":"9ZRY","./baseconnection":"tQFK"}],"GGp6":[function(require,module,exports) {
+"use strict";
+
+var __extends = this && this.__extends || function () {
+  var _extendStatics = function extendStatics(d, b) {
+    _extendStatics = Object.setPrototypeOf || {
+      __proto__: []
+    } instanceof Array && function (d, b) {
+      d.__proto__ = b;
+    } || function (d, b) {
+      for (var p in b) {
+        if (b.hasOwnProperty(p)) d[p] = b[p];
+      }
+    };
+
+    return _extendStatics(d, b);
+  };
+
+  return function (d, b) {
+    _extendStatics(d, b);
+
+    function __() {
+      this.constructor = d;
+    }
+
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+  };
+}();
+
+var __importDefault = this && this.__importDefault || function (mod) {
+  return mod && mod.__esModule ? mod : {
+    "default": mod
+  };
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var eventemitter3_1 = require("eventemitter3");
+
+var logger_1 = __importDefault(require("./logger"));
+
+var EncodingQueue =
+/** @class */
+function (_super) {
+  __extends(EncodingQueue, _super);
+
+  function EncodingQueue() {
+    var _this = _super.call(this) || this;
+
+    _this.fileReader = new FileReader();
+    _this._queue = [];
+    _this._processing = false;
+
+    _this.fileReader.onload = function (evt) {
+      _this._processing = false;
+
+      if (evt.target) {
+        _this.emit('done', evt.target.result);
+      }
+
+      _this.doNextTask();
+    };
+
+    _this.fileReader.onerror = function (evt) {
+      logger_1.default.error("EncodingQueue error:", evt);
+      _this._processing = false;
+
+      _this.destroy();
+
+      _this.emit('error', evt);
+    };
+
+    return _this;
+  }
+
+  Object.defineProperty(EncodingQueue.prototype, "queue", {
+    get: function get() {
+      return this._queue;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(EncodingQueue.prototype, "size", {
+    get: function get() {
+      return this.queue.length;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(EncodingQueue.prototype, "processing", {
+    get: function get() {
+      return this._processing;
+    },
+    enumerable: true,
+    configurable: true
+  });
+
+  EncodingQueue.prototype.enque = function (blob) {
+    this.queue.push(blob);
+    if (this.processing) return;
+    this.doNextTask();
+  };
+
+  EncodingQueue.prototype.destroy = function () {
+    this.fileReader.abort();
+    this._queue = [];
+  };
+
+  EncodingQueue.prototype.doNextTask = function () {
+    if (this.size === 0) return;
+    if (this.processing) return;
+    this._processing = true;
+    this.fileReader.readAsArrayBuffer(this.queue.shift());
+  };
+
+  return EncodingQueue;
+}(eventemitter3_1.EventEmitter);
+
+exports.EncodingQueue = EncodingQueue;
+},{"eventemitter3":"2JJl","./logger":"8WOs"}],"GBTQ":[function(require,module,exports) {
+"use strict";
+
+var __extends = this && this.__extends || function () {
+  var _extendStatics = function extendStatics(d, b) {
+    _extendStatics = Object.setPrototypeOf || {
+      __proto__: []
+    } instanceof Array && function (d, b) {
+      d.__proto__ = b;
+    } || function (d, b) {
+      for (var p in b) {
+        if (b.hasOwnProperty(p)) d[p] = b[p];
+      }
+    };
+
+    return _extendStatics(d, b);
+  };
+
+  return function (d, b) {
+    _extendStatics(d, b);
+
+    function __() {
+      this.constructor = d;
+    }
+
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+  };
+}();
+
+var __values = this && this.__values || function (o) {
+  var s = typeof Symbol === "function" && Symbol.iterator,
+      m = s && o[s],
+      i = 0;
+  if (m) return m.call(o);
+  if (o && typeof o.length === "number") return {
+    next: function next() {
+      if (o && i >= o.length) o = void 0;
+      return {
+        value: o && o[i++],
+        done: !o
+      };
+    }
+  };
+  throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
+};
+
+var __importDefault = this && this.__importDefault || function (mod) {
+  return mod && mod.__esModule ? mod : {
+    "default": mod
+  };
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var util_1 = require("./util");
+
+var logger_1 = __importDefault(require("./logger"));
+
+var negotiator_1 = require("./negotiator");
+
+var enums_1 = require("./enums");
+
+var baseconnection_1 = require("./baseconnection");
+
+var encodingQueue_1 = require("./encodingQueue");
+/**
+ * Wraps a DataChannel between two Peers.
+ */
+
+
+var DataConnection =
+/** @class */
+function (_super) {
+  __extends(DataConnection, _super);
+
+  function DataConnection(peerId, provider, options) {
+    var _this = _super.call(this, peerId, provider, options) || this;
+
+    _this._buffer = [];
+    _this._bufferSize = 0;
+    _this._buffering = false;
+    _this._chunkedData = {};
+    _this._encodingQueue = new encodingQueue_1.EncodingQueue();
+    _this.connectionId = _this.options.connectionId || DataConnection.ID_PREFIX + util_1.util.randomToken();
+    _this.label = _this.options.label || _this.connectionId;
+    _this.serialization = _this.options.serialization || enums_1.SerializationType.Binary;
+    _this.reliable = !!_this.options.reliable;
+
+    if (_this.options._payload) {
+      _this._peerBrowser = _this.options._payload.browser;
+    }
+
+    _this._encodingQueue.on('done', function (ab) {
+      _this._bufferedSend(ab);
+    });
+
+    _this._encodingQueue.on('error', function () {
+      logger_1.default.error("DC#" + _this.connectionId + ": Error occured in encoding from blob to arraybuffer, close DC");
+
+      _this.close();
+    });
+
+    _this._negotiator = new negotiator_1.Negotiator(_this);
+
+    _this._negotiator.startConnection(_this.options._payload || {
+      originator: true
+    });
+
+    return _this;
+  }
+
+  Object.defineProperty(DataConnection.prototype, "type", {
+    get: function get() {
+      return enums_1.ConnectionType.Data;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(DataConnection.prototype, "dataChannel", {
+    get: function get() {
+      return this._dc;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(DataConnection.prototype, "bufferSize", {
+    get: function get() {
+      return this._bufferSize;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  /** Called by the Negotiator when the DataChannel is ready. */
+
+  DataConnection.prototype.initialize = function (dc) {
+    this._dc = dc;
+
+    this._configureDataChannel();
+  };
+
+  DataConnection.prototype._configureDataChannel = function () {
+    var _this = this;
+
+    if (!util_1.util.supports.binaryBlob || util_1.util.supports.reliable) {
+      this.dataChannel.binaryType = "arraybuffer";
+    }
+
+    this.dataChannel.onopen = function () {
+      logger_1.default.log("DC#" + _this.connectionId + " dc connection success");
+      _this._open = true;
+
+      _this.emit(enums_1.ConnectionEventType.Open);
+    };
+
+    this.dataChannel.onmessage = function (e) {
+      logger_1.default.log("DC#" + _this.connectionId + " dc onmessage:", e.data);
+
+      _this._handleDataMessage(e);
+    };
+
+    this.dataChannel.onclose = function () {
+      logger_1.default.log("DC#" + _this.connectionId + " dc closed for:", _this.peer);
+
+      _this.close();
+    };
+  }; // Handles a DataChannel message.
+
+
+  DataConnection.prototype._handleDataMessage = function (_a) {
+    var _this = this;
+
+    var data = _a.data;
+    var datatype = data.constructor;
+    var isBinarySerialization = this.serialization === enums_1.SerializationType.Binary || this.serialization === enums_1.SerializationType.BinaryUTF8;
+    var deserializedData = data;
+
+    if (isBinarySerialization) {
+      if (datatype === Blob) {
+        // Datatype should never be blob
+        util_1.util.blobToArrayBuffer(data, function (ab) {
+          var unpackedData = util_1.util.unpack(ab);
+
+          _this.emit(enums_1.ConnectionEventType.Data, unpackedData);
+        });
+        return;
+      } else if (datatype === ArrayBuffer) {
+        deserializedData = util_1.util.unpack(data);
+      } else if (datatype === String) {
+        // String fallback for binary data for browsers that don't support binary yet
+        var ab = util_1.util.binaryStringToArrayBuffer(data);
+        deserializedData = util_1.util.unpack(ab);
+      }
+    } else if (this.serialization === enums_1.SerializationType.JSON) {
+      deserializedData = JSON.parse(data);
+    } // Check if we've chunked--if so, piece things back together.
+    // We're guaranteed that this isn't 0.
+
+
+    if (deserializedData.__peerData) {
+      this._handleChunk(deserializedData);
+
+      return;
+    }
+
+    _super.prototype.emit.call(this, enums_1.ConnectionEventType.Data, deserializedData);
+  };
+
+  DataConnection.prototype._handleChunk = function (data) {
+    var id = data.__peerData;
+    var chunkInfo = this._chunkedData[id] || {
+      data: [],
+      count: 0,
+      total: data.total
+    };
+    chunkInfo.data[data.n] = data.data;
+    chunkInfo.count++;
+    this._chunkedData[id] = chunkInfo;
+
+    if (chunkInfo.total === chunkInfo.count) {
+      // Clean up before making the recursive call to `_handleDataMessage`.
+      delete this._chunkedData[id]; // We've received all the chunks--time to construct the complete data.
+
+      var data_1 = new Blob(chunkInfo.data);
+
+      this._handleDataMessage({
+        data: data_1
+      });
+    }
+  };
+  /**
+   * Exposed functionality for users.
+   */
+
+  /** Allows user to close connection. */
+
+
+  DataConnection.prototype.close = function () {
+    this._buffer = [];
+    this._bufferSize = 0;
+    this._chunkedData = {};
+
+    if (this._negotiator) {
+      this._negotiator.cleanup();
+
+      this._negotiator = null;
+    }
+
+    if (this.provider) {
+      this.provider._removeConnection(this);
+
+      this.provider = null;
+    }
+
+    if (this.dataChannel) {
+      this.dataChannel.onopen = null;
+      this.dataChannel.onmessage = null;
+      this.dataChannel.onclose = null;
+      this._dc = null;
+    }
+
+    if (this._encodingQueue) {
+      this._encodingQueue.destroy();
+
+      this._encodingQueue.removeAllListeners();
+
+      this._encodingQueue = null;
+    }
+
+    if (!this.open) {
+      return;
+    }
+
+    this._open = false;
+
+    _super.prototype.emit.call(this, enums_1.ConnectionEventType.Close);
+  };
+  /** Allows user to send data. */
+
+
+  DataConnection.prototype.send = function (data, chunked) {
+    if (!this.open) {
+      _super.prototype.emit.call(this, enums_1.ConnectionEventType.Error, new Error("Connection is not open. You should listen for the `open` event before sending messages."));
+
+      return;
+    }
+
+    if (this.serialization === enums_1.SerializationType.JSON) {
+      this._bufferedSend(JSON.stringify(data));
+    } else if (this.serialization === enums_1.SerializationType.Binary || this.serialization === enums_1.SerializationType.BinaryUTF8) {
+      var blob = util_1.util.pack(data);
+
+      if (!chunked && blob.size > util_1.util.chunkedMTU) {
+        this._sendChunks(blob);
+
+        return;
+      }
+
+      if (!util_1.util.supports.binaryBlob) {
+        // We only do this if we really need to (e.g. blobs are not supported),
+        // because this conversion is costly.
+        this._encodingQueue.enque(blob);
+      } else {
+        this._bufferedSend(blob);
+      }
+    } else {
+      this._bufferedSend(data);
+    }
+  };
+
+  DataConnection.prototype._bufferedSend = function (msg) {
+    if (this._buffering || !this._trySend(msg)) {
+      this._buffer.push(msg);
+
+      this._bufferSize = this._buffer.length;
+    }
+  }; // Returns true if the send succeeds.
+
+
+  DataConnection.prototype._trySend = function (msg) {
+    var _this = this;
+
+    if (!this.open) {
+      return false;
+    }
+
+    if (this.dataChannel.bufferedAmount > DataConnection.MAX_BUFFERED_AMOUNT) {
+      this._buffering = true;
+      setTimeout(function () {
+        _this._buffering = false;
+
+        _this._tryBuffer();
+      }, 50);
+      return false;
+    }
+
+    try {
+      this.dataChannel.send(msg);
+    } catch (e) {
+      logger_1.default.error("DC#:" + this.connectionId + " Error when sending:", e);
+      this._buffering = true;
+      this.close();
+      return false;
+    }
+
+    return true;
+  }; // Try to send the first message in the buffer.
+
+
+  DataConnection.prototype._tryBuffer = function () {
+    if (!this.open) {
+      return;
+    }
+
+    if (this._buffer.length === 0) {
+      return;
+    }
+
+    var msg = this._buffer[0];
+
+    if (this._trySend(msg)) {
+      this._buffer.shift();
+
+      this._bufferSize = this._buffer.length;
+
+      this._tryBuffer();
+    }
+  };
+
+  DataConnection.prototype._sendChunks = function (blob) {
+    var e_1, _a;
+
+    var blobs = util_1.util.chunk(blob);
+    logger_1.default.log("DC#" + this.connectionId + " Try to send " + blobs.length + " chunks...");
+
+    try {
+      for (var blobs_1 = __values(blobs), blobs_1_1 = blobs_1.next(); !blobs_1_1.done; blobs_1_1 = blobs_1.next()) {
+        var blob_1 = blobs_1_1.value;
+        this.send(blob_1, true);
+      }
+    } catch (e_1_1) {
+      e_1 = {
+        error: e_1_1
+      };
+    } finally {
+      try {
+        if (blobs_1_1 && !blobs_1_1.done && (_a = blobs_1.return)) _a.call(blobs_1);
+      } finally {
+        if (e_1) throw e_1.error;
+      }
+    }
+  };
+
+  DataConnection.prototype.handleMessage = function (message) {
+    var payload = message.payload;
+
+    switch (message.type) {
+      case enums_1.ServerMessageType.Answer:
+        this._peerBrowser = payload.browser; // Forward to negotiator
+
+        this._negotiator.handleSDP(message.type, payload.sdp);
+
+        break;
+
+      case enums_1.ServerMessageType.Candidate:
+        this._negotiator.handleCandidate(payload.candidate);
+
+        break;
+
+      default:
+        logger_1.default.warn("Unrecognized message type:", message.type, "from peer:", this.peer);
+        break;
+    }
+  };
+
+  DataConnection.ID_PREFIX = "dc_";
+  DataConnection.MAX_BUFFERED_AMOUNT = 8 * 1024 * 1024;
+  return DataConnection;
+}(baseconnection_1.BaseConnection);
+
+exports.DataConnection = DataConnection;
+},{"./util":"BHXf","./logger":"8WOs","./negotiator":"HCdX","./enums":"9ZRY","./baseconnection":"tQFK","./encodingQueue":"GGp6"}],"in7L":[function(require,module,exports) {
+"use strict";
+
+var __awaiter = this && this.__awaiter || function (thisArg, _arguments, P, generator) {
+  function adopt(value) {
+    return value instanceof P ? value : new P(function (resolve) {
+      resolve(value);
+    });
+  }
+
+  return new (P || (P = Promise))(function (resolve, reject) {
+    function fulfilled(value) {
+      try {
+        step(generator.next(value));
+      } catch (e) {
+        reject(e);
+      }
+    }
+
+    function rejected(value) {
+      try {
+        step(generator["throw"](value));
+      } catch (e) {
+        reject(e);
+      }
+    }
+
+    function step(result) {
+      result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected);
+    }
+
+    step((generator = generator.apply(thisArg, _arguments || [])).next());
+  });
+};
+
+var __generator = this && this.__generator || function (thisArg, body) {
+  var _ = {
+    label: 0,
+    sent: function sent() {
+      if (t[0] & 1) throw t[1];
+      return t[1];
+    },
+    trys: [],
+    ops: []
+  },
+      f,
+      y,
+      t,
+      g;
+  return g = {
+    next: verb(0),
+    "throw": verb(1),
+    "return": verb(2)
+  }, typeof Symbol === "function" && (g[Symbol.iterator] = function () {
+    return this;
+  }), g;
+
+  function verb(n) {
+    return function (v) {
+      return step([n, v]);
+    };
+  }
+
+  function step(op) {
+    if (f) throw new TypeError("Generator is already executing.");
+
+    while (_) {
+      try {
+        if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
+        if (y = 0, t) op = [op[0] & 2, t.value];
+
+        switch (op[0]) {
+          case 0:
+          case 1:
+            t = op;
+            break;
+
+          case 4:
+            _.label++;
+            return {
+              value: op[1],
+              done: false
+            };
+
+          case 5:
+            _.label++;
+            y = op[1];
+            op = [0];
+            continue;
+
+          case 7:
+            op = _.ops.pop();
+
+            _.trys.pop();
+
+            continue;
+
+          default:
+            if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) {
+              _ = 0;
+              continue;
+            }
+
+            if (op[0] === 3 && (!t || op[1] > t[0] && op[1] < t[3])) {
+              _.label = op[1];
+              break;
+            }
+
+            if (op[0] === 6 && _.label < t[1]) {
+              _.label = t[1];
+              t = op;
+              break;
+            }
+
+            if (t && _.label < t[2]) {
+              _.label = t[2];
+
+              _.ops.push(op);
+
+              break;
+            }
+
+            if (t[2]) _.ops.pop();
+
+            _.trys.pop();
+
+            continue;
+        }
+
+        op = body.call(thisArg, _);
+      } catch (e) {
+        op = [6, e];
+        y = 0;
+      } finally {
+        f = t = 0;
+      }
+    }
+
+    if (op[0] & 5) throw op[1];
+    return {
+      value: op[0] ? op[1] : void 0,
+      done: true
+    };
+  }
+};
+
+var __importDefault = this && this.__importDefault || function (mod) {
+  return mod && mod.__esModule ? mod : {
+    "default": mod
+  };
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var util_1 = require("./util");
+
+var logger_1 = __importDefault(require("./logger"));
+
+var API =
+/** @class */
+function () {
+  function API(_options) {
+    this._options = _options;
+  }
+
+  API.prototype._buildUrl = function (method) {
+    var protocol = this._options.secure ? "https://" : "http://";
+    var url = protocol + this._options.host + ":" + this._options.port + this._options.path + this._options.key + "/" + method;
+    var queryString = "?ts=" + new Date().getTime() + "" + Math.random();
+    url += queryString;
+    return url;
+  };
+  /** Get a unique ID from the server via XHR and initialize with it. */
+
+
+  API.prototype.retrieveId = function () {
+    return __awaiter(this, void 0, Promise, function () {
+      var url, response, error_1, pathError;
+      return __generator(this, function (_a) {
+        switch (_a.label) {
+          case 0:
+            url = this._buildUrl("id");
+            _a.label = 1;
+
+          case 1:
+            _a.trys.push([1, 3,, 4]);
+
+            return [4
+            /*yield*/
+            , fetch(url)];
+
+          case 2:
+            response = _a.sent();
+
+            if (response.status !== 200) {
+              throw new Error("Error. Status:" + response.status);
+            }
+
+            return [2
+            /*return*/
+            , response.text()];
+
+          case 3:
+            error_1 = _a.sent();
+            logger_1.default.error("Error retrieving ID", error_1);
+            pathError = "";
+
+            if (this._options.path === "/" && this._options.host !== util_1.util.CLOUD_HOST) {
+              pathError = " If you passed in a `path` to your self-hosted PeerServer, " + "you'll also need to pass in that same path when creating a new " + "Peer.";
+            }
+
+            throw new Error("Could not get an ID from the server." + pathError);
+
+          case 4:
+            return [2
+            /*return*/
+            ];
+        }
+      });
+    });
+  };
+  /** @deprecated */
+
+
+  API.prototype.listAllPeers = function () {
+    return __awaiter(this, void 0, Promise, function () {
+      var url, response, helpfulError, error_2;
+      return __generator(this, function (_a) {
+        switch (_a.label) {
+          case 0:
+            url = this._buildUrl("peers");
+            _a.label = 1;
+
+          case 1:
+            _a.trys.push([1, 3,, 4]);
+
+            return [4
+            /*yield*/
+            , fetch(url)];
+
+          case 2:
+            response = _a.sent();
+
+            if (response.status !== 200) {
+              if (response.status === 401) {
+                helpfulError = "";
+
+                if (this._options.host === util_1.util.CLOUD_HOST) {
+                  helpfulError = "It looks like you're using the cloud server. You can email " + "team@peerjs.com to enable peer listing for your API key.";
+                } else {
+                  helpfulError = "You need to enable `allow_discovery` on your self-hosted " + "PeerServer to use this feature.";
+                }
+
+                throw new Error("It doesn't look like you have permission to list peers IDs. " + helpfulError);
+              }
+
+              throw new Error("Error. Status:" + response.status);
+            }
+
+            return [2
+            /*return*/
+            , response.json()];
+
+          case 3:
+            error_2 = _a.sent();
+            logger_1.default.error("Error retrieving list peers", error_2);
+            throw new Error("Could not get list peers from the server." + error_2);
+
+          case 4:
+            return [2
+            /*return*/
+            ];
+        }
+      });
+    });
+  };
+
+  return API;
+}();
+
+exports.API = API;
+},{"./util":"BHXf","./logger":"8WOs"}],"Hxpd":[function(require,module,exports) {
+"use strict";
+
+var __extends = this && this.__extends || function () {
+  var _extendStatics = function extendStatics(d, b) {
+    _extendStatics = Object.setPrototypeOf || {
+      __proto__: []
+    } instanceof Array && function (d, b) {
+      d.__proto__ = b;
+    } || function (d, b) {
+      for (var p in b) {
+        if (b.hasOwnProperty(p)) d[p] = b[p];
+      }
+    };
+
+    return _extendStatics(d, b);
+  };
+
+  return function (d, b) {
+    _extendStatics(d, b);
+
+    function __() {
+      this.constructor = d;
+    }
+
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+  };
+}();
+
+var __assign = this && this.__assign || function () {
+  __assign = Object.assign || function (t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+      s = arguments[i];
+
+      for (var p in s) {
+        if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
+      }
+    }
+
+    return t;
+  };
+
+  return __assign.apply(this, arguments);
+};
+
+var __values = this && this.__values || function (o) {
+  var s = typeof Symbol === "function" && Symbol.iterator,
+      m = s && o[s],
+      i = 0;
+  if (m) return m.call(o);
+  if (o && typeof o.length === "number") return {
+    next: function next() {
+      if (o && i >= o.length) o = void 0;
+      return {
+        value: o && o[i++],
+        done: !o
+      };
+    }
+  };
+  throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
+};
+
+var __read = this && this.__read || function (o, n) {
+  var m = typeof Symbol === "function" && o[Symbol.iterator];
+  if (!m) return o;
+  var i = m.call(o),
+      r,
+      ar = [],
+      e;
+
+  try {
+    while ((n === void 0 || n-- > 0) && !(r = i.next()).done) {
+      ar.push(r.value);
+    }
+  } catch (error) {
+    e = {
+      error: error
+    };
+  } finally {
+    try {
+      if (r && !r.done && (m = i["return"])) m.call(i);
+    } finally {
+      if (e) throw e.error;
+    }
+  }
+
+  return ar;
+};
+
+var __importDefault = this && this.__importDefault || function (mod) {
+  return mod && mod.__esModule ? mod : {
+    "default": mod
+  };
+};
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var eventemitter3_1 = require("eventemitter3");
+
+var util_1 = require("./util");
+
+var logger_1 = __importDefault(require("./logger"));
+
+var socket_1 = require("./socket");
+
+var mediaconnection_1 = require("./mediaconnection");
+
+var dataconnection_1 = require("./dataconnection");
+
+var enums_1 = require("./enums");
+
+var api_1 = require("./api");
+
+var PeerOptions =
+/** @class */
+function () {
+  function PeerOptions() {}
+
+  return PeerOptions;
+}();
+/**
+ * A peer who can initiate connections with other peers.
+ */
+
+
+var Peer =
+/** @class */
+function (_super) {
+  __extends(Peer, _super);
+
+  function Peer(id, options) {
+    var _this = _super.call(this) || this; // States.
+
+
+    _this._destroyed = false; // Connections have been killed
+
+    _this._disconnected = false; // Connection to PeerServer killed but P2P connections still active
+
+    _this._open = false; // Sockets and such are not yet open.
+
+    _this._connections = new Map(); // All connections for this peer.
+
+    _this._lostMessages = new Map(); // src => [list of messages]
+
+    var userId; // Deal with overloading
+
+    if (id && id.constructor == Object) {
+      options = id;
+    } else if (id) {
+      userId = id.toString();
+    } // Configurize options
+
+
+    options = __assign({
+      debug: 0,
+      host: util_1.util.CLOUD_HOST,
+      port: util_1.util.CLOUD_PORT,
+      path: "/",
+      key: Peer.DEFAULT_KEY,
+      token: util_1.util.randomToken(),
+      config: util_1.util.defaultConfig
+    }, options);
+    _this._options = options; // Detect relative URL host.
+
+    if (_this._options.host === "/") {
+      _this._options.host = window.location.hostname;
+    } // Set path correctly.
+
+
+    if (_this._options.path) {
+      if (_this._options.path[0] !== "/") {
+        _this._options.path = "/" + _this._options.path;
+      }
+
+      if (_this._options.path[_this._options.path.length - 1] !== "/") {
+        _this._options.path += "/";
+      }
+    } // Set whether we use SSL to same as current host
+
+
+    if (_this._options.secure === undefined && _this._options.host !== util_1.util.CLOUD_HOST) {
+      _this._options.secure = util_1.util.isSecure();
+    } else if (_this._options.host == util_1.util.CLOUD_HOST) {
+      _this._options.secure = true;
+    } // Set a custom log function if present
+
+
+    if (_this._options.logFunction) {
+      logger_1.default.setLogFunction(_this._options.logFunction);
+    }
+
+    logger_1.default.logLevel = _this._options.debug || 0; // Sanity checks
+    // Ensure WebRTC supported
+
+    if (!util_1.util.supports.audioVideo && !util_1.util.supports.data) {
+      _this._delayedAbort(enums_1.PeerErrorType.BrowserIncompatible, "The current browser does not support WebRTC");
+
+      return _this;
+    } // Ensure alphanumeric id
+
+
+    if (!!userId && !util_1.util.validateId(userId)) {
+      _this._delayedAbort(enums_1.PeerErrorType.InvalidID, "ID \"" + userId + "\" is invalid");
+
+      return _this;
+    }
+
+    _this._api = new api_1.API(options); // Start the server connection
+
+    _this._initializeServerConnection();
+
+    if (userId) {
+      _this._initialize(userId);
+    } else {
+      _this._api.retrieveId().then(function (id) {
+        return _this._initialize(id);
+      }).catch(function (error) {
+        return _this._abort(enums_1.PeerErrorType.ServerError, error);
+      });
+    }
+
+    return _this;
+  }
+
+  Object.defineProperty(Peer.prototype, "id", {
+    get: function get() {
+      return this._id;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(Peer.prototype, "options", {
+    get: function get() {
+      return this._options;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(Peer.prototype, "open", {
+    get: function get() {
+      return this._open;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(Peer.prototype, "socket", {
+    get: function get() {
+      return this._socket;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(Peer.prototype, "connections", {
+    /**
+     * @deprecated
+     * Return type will change from Object to Map<string,[]>
+     */
+    get: function get() {
+      var e_1, _a;
+
+      var plainConnections = Object.create(null);
+
+      try {
+        for (var _b = __values(this._connections), _c = _b.next(); !_c.done; _c = _b.next()) {
+          var _d = __read(_c.value, 2),
+              k = _d[0],
+              v = _d[1];
+
+          plainConnections[k] = v;
+        }
+      } catch (e_1_1) {
+        e_1 = {
+          error: e_1_1
+        };
+      } finally {
+        try {
+          if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
+        } finally {
+          if (e_1) throw e_1.error;
+        }
+      }
+
+      return plainConnections;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(Peer.prototype, "destroyed", {
+    get: function get() {
+      return this._destroyed;
+    },
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(Peer.prototype, "disconnected", {
+    get: function get() {
+      return this._disconnected;
+    },
+    enumerable: true,
+    configurable: true
+  }); // Initialize the 'socket' (which is actually a mix of XHR streaming and
+  // websockets.)
+
+  Peer.prototype._initializeServerConnection = function () {
+    var _this = this;
+
+    this._socket = new socket_1.Socket(this._options.secure, this._options.host, this._options.port, this._options.path, this._options.key, this._options.pingInterval);
+    this.socket.on(enums_1.SocketEventType.Message, function (data) {
+      _this._handleMessage(data);
+    });
+    this.socket.on(enums_1.SocketEventType.Error, function (error) {
+      _this._abort(enums_1.PeerErrorType.SocketError, error);
+    });
+    this.socket.on(enums_1.SocketEventType.Disconnected, function () {
+      // If we haven't explicitly disconnected, emit error and disconnect.
+      if (!_this.disconnected) {
+        _this.emitError(enums_1.PeerErrorType.Network, "Lost connection to server.");
+
+        _this.disconnect();
+      }
+    });
+    this.socket.on(enums_1.SocketEventType.Close, function () {
+      // If we haven't explicitly disconnected, emit error.
+      if (!_this.disconnected) {
+        _this._abort(enums_1.PeerErrorType.SocketClosed, "Underlying socket is already closed.");
+      }
+    });
+  };
+  /** Initialize a connection with the server. */
+
+
+  Peer.prototype._initialize = function (id) {
+    this._id = id;
+    this.socket.start(this.id, this._options.token);
+  };
+  /** Handles messages from the server. */
+
+
+  Peer.prototype._handleMessage = function (message) {
+    var e_2, _a;
+
+    var type = message.type;
+    var payload = message.payload;
+    var peerId = message.src;
+
+    switch (type) {
+      case enums_1.ServerMessageType.Open:
+        // The connection to the server is open.
+        this.emit(enums_1.PeerEventType.Open, this.id);
+        this._open = true;
+        break;
+
+      case enums_1.ServerMessageType.Error:
+        // Server error.
+        this._abort(enums_1.PeerErrorType.ServerError, payload.msg);
+
+        break;
+
+      case enums_1.ServerMessageType.IdTaken:
+        // The selected ID is taken.
+        this._abort(enums_1.PeerErrorType.UnavailableID, "ID \"" + this.id + "\" is taken");
+
+        break;
+
+      case enums_1.ServerMessageType.InvalidKey:
+        // The given API key cannot be found.
+        this._abort(enums_1.PeerErrorType.InvalidKey, "API KEY \"" + this._options.key + "\" is invalid");
+
+        break;
+
+      case enums_1.ServerMessageType.Leave:
+        // Another peer has closed its connection to this peer.
+        logger_1.default.log("Received leave message from", peerId);
+
+        this._cleanupPeer(peerId);
+
+        this._connections.delete(peerId);
+
+        break;
+
+      case enums_1.ServerMessageType.Expire:
+        // The offer sent to a peer has expired without response.
+        this.emitError(enums_1.PeerErrorType.PeerUnavailable, "Could not connect to peer " + peerId);
+        break;
+
+      case enums_1.ServerMessageType.Offer:
+        {
+          // we should consider switching this to CALL/CONNECT, but this is the least breaking option.
+          var connectionId = payload.connectionId;
+          var connection = this.getConnection(peerId, connectionId);
+
+          if (connection) {
+            connection.close();
+            logger_1.default.warn("Offer received for existing Connection ID:", connectionId);
+          } // Create a new connection.
+
+
+          if (payload.type === enums_1.ConnectionType.Media) {
+            connection = new mediaconnection_1.MediaConnection(peerId, this, {
+              connectionId: connectionId,
+              _payload: payload,
+              metadata: payload.metadata
+            });
+
+            this._addConnection(peerId, connection);
+
+            this.emit(enums_1.PeerEventType.Call, connection);
+          } else if (payload.type === enums_1.ConnectionType.Data) {
+            connection = new dataconnection_1.DataConnection(peerId, this, {
+              connectionId: connectionId,
+              _payload: payload,
+              metadata: payload.metadata,
+              label: payload.label,
+              serialization: payload.serialization,
+              reliable: payload.reliable
+            });
+
+            this._addConnection(peerId, connection);
+
+            this.emit(enums_1.PeerEventType.Connection, connection);
+          } else {
+            logger_1.default.warn("Received malformed connection type:", payload.type);
+            return;
+          } // Find messages.
+
+
+          var messages = this._getMessages(connectionId);
+
+          try {
+            for (var messages_1 = __values(messages), messages_1_1 = messages_1.next(); !messages_1_1.done; messages_1_1 = messages_1.next()) {
+              var message_1 = messages_1_1.value;
+              connection.handleMessage(message_1);
+            }
+          } catch (e_2_1) {
+            e_2 = {
+              error: e_2_1
+            };
+          } finally {
+            try {
+              if (messages_1_1 && !messages_1_1.done && (_a = messages_1.return)) _a.call(messages_1);
+            } finally {
+              if (e_2) throw e_2.error;
+            }
+          }
+
+          break;
+        }
+
+      default:
+        {
+          if (!payload) {
+            logger_1.default.warn("You received a malformed message from " + peerId + " of type " + type);
+            return;
+          }
+
+          var connectionId = payload.connectionId;
+          var connection = this.getConnection(peerId, connectionId);
+
+          if (connection && connection.peerConnection) {
+            // Pass it on.
+            connection.handleMessage(message);
+          } else if (connectionId) {
+            // Store for possible later use
+            this._storeMessage(connectionId, message);
+          } else {
+            logger_1.default.warn("You received an unrecognized message:", message);
+          }
+
+          break;
+        }
+    }
+  };
+  /** Stores messages without a set up connection, to be claimed later. */
+
+
+  Peer.prototype._storeMessage = function (connectionId, message) {
+    if (!this._lostMessages.has(connectionId)) {
+      this._lostMessages.set(connectionId, []);
+    }
+
+    this._lostMessages.get(connectionId).push(message);
+  };
+  /** Retrieve messages from lost message store */
+  //TODO Change it to private
+
+
+  Peer.prototype._getMessages = function (connectionId) {
+    var messages = this._lostMessages.get(connectionId);
+
+    if (messages) {
+      this._lostMessages.delete(connectionId);
+
+      return messages;
+    }
+
+    return [];
+  };
+  /**
+   * Returns a DataConnection to the specified peer. See documentation for a
+   * complete list of options.
+   */
+
+
+  Peer.prototype.connect = function (peer, options) {
+    if (options === void 0) {
+      options = {};
+    }
+
+    if (this.disconnected) {
+      logger_1.default.warn("You cannot connect to a new Peer because you called " + ".disconnect() on this Peer and ended your connection with the " + "server. You can create a new Peer to reconnect, or call reconnect " + "on this peer if you believe its ID to still be available.");
+      this.emitError(enums_1.PeerErrorType.Disconnected, "Cannot connect to new Peer after disconnecting from server.");
+      return;
+    }
+
+    var dataConnection = new dataconnection_1.DataConnection(peer, this, options);
+
+    this._addConnection(peer, dataConnection);
+
+    return dataConnection;
+  };
+  /**
+   * Returns a MediaConnection to the specified peer. See documentation for a
+   * complete list of options.
+   */
+
+
+  Peer.prototype.call = function (peer, stream, options) {
+    if (options === void 0) {
+      options = {};
+    }
+
+    if (this.disconnected) {
+      logger_1.default.warn("You cannot connect to a new Peer because you called " + ".disconnect() on this Peer and ended your connection with the " + "server. You can create a new Peer to reconnect.");
+      this.emitError(enums_1.PeerErrorType.Disconnected, "Cannot connect to new Peer after disconnecting from server.");
+      return;
+    }
+
+    if (!stream) {
+      logger_1.default.error("To call a peer, you must provide a stream from your browser's `getUserMedia`.");
+      return;
+    }
+
+    options._stream = stream;
+    var mediaConnection = new mediaconnection_1.MediaConnection(peer, this, options);
+
+    this._addConnection(peer, mediaConnection);
+
+    return mediaConnection;
+  };
+  /** Add a data/media connection to this peer. */
+
+
+  Peer.prototype._addConnection = function (peerId, connection) {
+    logger_1.default.log("add connection " + connection.type + ":" + connection.connectionId + "\n       to peerId:" + peerId);
+
+    if (!this._connections.has(peerId)) {
+      this._connections.set(peerId, []);
+    }
+
+    this._connections.get(peerId).push(connection);
+  }; //TODO should be private
+
+
+  Peer.prototype._removeConnection = function (connection) {
+    var connections = this._connections.get(connection.peer);
+
+    if (connections) {
+      var index = connections.indexOf(connection);
+
+      if (index !== -1) {
+        connections.splice(index, 1);
+      }
+    } //remove from lost messages
+
+
+    this._lostMessages.delete(connection.connectionId);
+  };
+  /** Retrieve a data/media connection for this peer. */
+
+
+  Peer.prototype.getConnection = function (peerId, connectionId) {
+    var e_3, _a;
+
+    var connections = this._connections.get(peerId);
+
+    if (!connections) {
+      return null;
+    }
+
+    try {
+      for (var connections_1 = __values(connections), connections_1_1 = connections_1.next(); !connections_1_1.done; connections_1_1 = connections_1.next()) {
+        var connection = connections_1_1.value;
+
+        if (connection.connectionId === connectionId) {
+          return connection;
+        }
+      }
+    } catch (e_3_1) {
+      e_3 = {
+        error: e_3_1
+      };
+    } finally {
+      try {
+        if (connections_1_1 && !connections_1_1.done && (_a = connections_1.return)) _a.call(connections_1);
+      } finally {
+        if (e_3) throw e_3.error;
+      }
+    }
+
+    return null;
+  };
+
+  Peer.prototype._delayedAbort = function (type, message) {
+    var _this = this;
+
+    setTimeout(function () {
+      _this._abort(type, message);
+    }, 0);
+  };
+  /**
+   * Emits an error message and destroys the Peer.
+   * The Peer is not destroyed if it's in a disconnected state, in which case
+   * it retains its disconnected state and its existing connections.
+   */
+
+
+  Peer.prototype._abort = function (type, message) {
+    logger_1.default.error("Aborting!");
+    this.emitError(type, message);
+
+    if (!this._lastServerId) {
+      this.destroy();
+    } else {
+      this.disconnect();
+    }
+  };
+  /** Emits a typed error message. */
+
+
+  Peer.prototype.emitError = function (type, err) {
+    logger_1.default.error("Error:", err);
+
+    if (typeof err === "string") {
+      err = new Error(err);
+    }
+
+    err.type = type;
+    this.emit(enums_1.PeerEventType.Error, err);
+  };
+  /**
+   * Destroys the Peer: closes all active connections as well as the connection
+   *  to the server.
+   * Warning: The peer can no longer create or accept connections after being
+   *  destroyed.
+   */
+
+
+  Peer.prototype.destroy = function () {
+    if (!this.destroyed) {
+      this._cleanup();
+
+      this.disconnect();
+      this._destroyed = true;
+    }
+  };
+  /** Disconnects every connection on this peer. */
+
+
+  Peer.prototype._cleanup = function () {
+    var e_4, _a;
+
+    try {
+      for (var _b = __values(this._connections.keys()), _c = _b.next(); !_c.done; _c = _b.next()) {
+        var peerId = _c.value;
+
+        this._cleanupPeer(peerId);
+
+        this._connections.delete(peerId);
+      }
+    } catch (e_4_1) {
+      e_4 = {
+        error: e_4_1
+      };
+    } finally {
+      try {
+        if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
+      } finally {
+        if (e_4) throw e_4.error;
+      }
+    }
+
+    this.emit(enums_1.PeerEventType.Close);
+  };
+  /** Closes all connections to this peer. */
+
+
+  Peer.prototype._cleanupPeer = function (peerId) {
+    var e_5, _a;
+
+    var connections = this._connections.get(peerId);
+
+    if (!connections) return;
+
+    try {
+      for (var connections_2 = __values(connections), connections_2_1 = connections_2.next(); !connections_2_1.done; connections_2_1 = connections_2.next()) {
+        var connection = connections_2_1.value;
+        connection.close();
+      }
+    } catch (e_5_1) {
+      e_5 = {
+        error: e_5_1
+      };
+    } finally {
+      try {
+        if (connections_2_1 && !connections_2_1.done && (_a = connections_2.return)) _a.call(connections_2);
+      } finally {
+        if (e_5) throw e_5.error;
+      }
+    }
+  };
+  /**
+   * Disconnects the Peer's connection to the PeerServer. Does not close any
+   *  active connections.
+   * Warning: The peer can no longer create or accept connections after being
+   *  disconnected. It also cannot reconnect to the server.
+   */
+
+
+  Peer.prototype.disconnect = function () {
+    var _this = this;
+
+    setTimeout(function () {
+      if (!_this.disconnected) {
+        _this._disconnected = true;
+        _this._open = false;
+
+        if (_this.socket) {
+          _this.socket.close();
+        }
+
+        _this.emit(enums_1.PeerEventType.Disconnected, _this.id);
+
+        _this._lastServerId = _this.id;
+        _this._id = null;
+      }
+    }, 0);
+  };
+  /** Attempts to reconnect with the same ID. */
+
+
+  Peer.prototype.reconnect = function () {
+    if (this.disconnected && !this.destroyed) {
+      logger_1.default.log("Attempting reconnection to server with ID " + this._lastServerId);
+      this._disconnected = false;
+
+      this._initializeServerConnection();
+
+      this._initialize(this._lastServerId);
+    } else if (this.destroyed) {
+      throw new Error("This peer cannot reconnect to the server. It has already been destroyed.");
+    } else if (!this.disconnected && !this.open) {
+      // Do nothing. We're still connecting the first time.
+      logger_1.default.error("In a hurry? We're still trying to make the initial connection!");
+    } else {
+      throw new Error("Peer " + this.id + " cannot reconnect because it is not disconnected from the server!");
+    }
+  };
+  /**
+   * Get a list of available peer IDs. If you're running your own server, you'll
+   * want to set allow_discovery: true in the PeerServer options. If you're using
+   * the cloud server, email team@peerjs.com to get the functionality enabled for
+   * your key.
+   */
+
+
+  Peer.prototype.listAllPeers = function (cb) {
+    var _this = this;
+
+    if (cb === void 0) {
+      cb = function cb(_) {};
+    }
+
+    this._api.listAllPeers().then(function (peers) {
+      return cb(peers);
+    }).catch(function (error) {
+      return _this._abort(enums_1.PeerErrorType.ServerError, error);
+    });
+  };
+
+  Peer.DEFAULT_KEY = "peerjs";
+  return Peer;
+}(eventemitter3_1.EventEmitter);
+
+exports.Peer = Peer;
+},{"eventemitter3":"2JJl","./util":"BHXf","./logger":"8WOs","./socket":"wJlv","./mediaconnection":"dbHP","./dataconnection":"GBTQ","./enums":"9ZRY","./api":"in7L"}],"iTK6":[function(require,module,exports) {
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var util_1 = require("./util");
+
+var peer_1 = require("./peer");
+
+exports.peerjs = {
+  Peer: peer_1.Peer,
+  util: util_1.util
+};
+exports.default = peer_1.Peer;
+window.peerjs = exports.peerjs;
+/** @deprecated Should use peerjs namespace */
+
+window.Peer = peer_1.Peer;
+},{"./util":"BHXf","./peer":"Hxpd"}]},{},["iTK6"], null)
+//# sourceMappingURL=/peerjs.js.map

package.json

@@ -1,6 +1,6 @@
 {
   "name": "peerjs",
-  "version": "1.0.4",
+  "version": "1.1.0",
   "description": "PeerJS client",
   "main": "./dist/peerjs.min.js",
   "repository": {
@@ -10,7 +10,8 @@
   "author": "Michelle Bu, Eric Zhang, Jairo Caro-Accino, Carlos Caballero",
   "license": "MIT",
   "scripts": {
-    "build": "parcel build lib/exports.ts -d dist --out-file peerjs.min.js",
+    "build": "parcel build lib/exports.ts --out-file peerjs.min.js",
+    "build-nonminified": "parcel build lib/exports.ts --out-file peerjs.js --no-minify",
     "prepublish": "npm run build",
     "postinstall": "opencollective-postinstall",
     "test": "mocha -r ts-node/register -r jsdom-global/register test/**/*.ts"