(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.SimpleWebRTC = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
"use strict";

/* global module, chrome */
// getScreenMedia helper by @HenrikJoreteg
var getUserMedia = function getUserMedia(constraints, callback) {
  if (!window.navigator || !window.navigator.mediaDevices || !window.navigator.mediaDevices.getUserMedia) {
    var error = new Error('MediaStreamError');
    error.name = 'NotSupportedError';

    if (callback) {
      callback(error, null);
    }

    return;
  }

  window.navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
    callback(null, stream);
  })["catch"](function (error) {
    callback(error, null);
  });
}; // cache for constraints and callback


var cache = {};

module.exports = function (mode, constraints, cb) {
  var hasConstraints = arguments.length === 3;
  var callback = hasConstraints ? cb : constraints;
  var error;

  if (typeof window === 'undefined' || window.location.protocol === 'http:') {
    error = new Error('NavigatorUserMediaError');
    error.name = 'HTTPS_REQUIRED';
    return callback(error);
  }

  if (navigator.mediaDevices && navigator.mediaDevices.getDisplayMedia) {
    navigator.mediaDevices.getDisplayMedia({
      video: true
    }).then(function (stream) {
      callback(null, stream);
    })["catch"](function (error) {
      callback(error, null);
    });
  } else if (navigator.webkitGetUserMedia) {
    var chromever = parseInt(window.navigator.userAgent.match(/Chrome\/(\d+)\./)[1], 10);
    var maxver = 33; // Chrome 71 dropped support for "window.chrome.webstore;".

    var isCef = chromever < 71 && !window.chrome.webstore; // "known" crash in chrome 34 and 35 on linux

    if (window.navigator.userAgent.match('Linux')) {
      maxver = 35;
    } // check that the extension is installed by looking for a
    // sessionStorage variable that contains the extension id
    // this has to be set after installation unless the contest
    // script does that


    if (sessionStorage.getScreenMediaJSExtensionId) {
      chrome.runtime.sendMessage(sessionStorage.getScreenMediaJSExtensionId, {
        type: 'getScreen',
        id: 1
      }, null, function (data) {
        if (!data || data.sourceId === '') {
          // user canceled
          var error = new Error('NavigatorUserMediaError');
          error.name = 'PERMISSION_DENIED';
          callback(error);
        } else {
          constraints = hasConstraints && constraints || {
            audio: false,
            video: {
              mandatory: {
                chromeMediaSource: 'desktop',
                maxWidth: window.screen.width,
                maxHeight: window.screen.height,
                maxFrameRate: 3
              }
            }
          };
          constraints.video.mandatory.chromeMediaSourceId = data.sourceId;
          getUserMedia(constraints, callback);
        }
      });
    } else if (window.cefGetScreenMedia) {
      //window.cefGetScreenMedia is experimental - may be removed without notice
      window.cefGetScreenMedia(function (sourceId) {
        if (!sourceId) {
          var error = new Error('cefGetScreenMediaError');
          error.name = 'CEF_GETSCREENMEDIA_CANCELED';
          callback(error);
        } else {
          constraints = hasConstraints && constraints || {
            audio: false,
            video: {
              mandatory: {
                chromeMediaSource: 'desktop',
                maxWidth: window.screen.width,
                maxHeight: window.screen.height,
                maxFrameRate: 3
              },
              optional: [{
                googLeakyBucket: true
              }, {
                googTemporalLayeredScreencast: true
              }]
            }
          };
          constraints.video.mandatory.chromeMediaSourceId = sourceId;
          getUserMedia(constraints, callback);
        }
      });
    } else if (isCef || chromever >= 26 && chromever <= maxver) {
      // chrome 26 - chrome 33 way to do it -- requires bad chrome://flags
      // note: this is basically in maintenance mode and will go away soon
      constraints = hasConstraints && constraints || {
        video: {
          mandatory: {
            googLeakyBucket: true,
            maxWidth: window.screen.width,
            maxHeight: window.screen.height,
            maxFrameRate: 3,
            chromeMediaSource: 'screen'
          }
        }
      };
      getUserMedia(constraints, callback);
    } else {
      // chrome 34+ way requiring an extension
      var pending = window.setTimeout(function () {
        error = new Error('NavigatorUserMediaError');
        error.name = 'EXTENSION_UNAVAILABLE';
        return callback(error);
      }, 1000);
      cache[pending] = [callback, hasConstraints ? constraints : null];
      window.postMessage({
        type: 'getScreen',
        id: pending
      }, '*');
    }
  } else if (window.navigator.userAgent.match('Firefox')) {
    var ffver = parseInt(window.navigator.userAgent.match(/Firefox\/(.*)/)[1], 10);

    if (ffver >= 52) {
      mode = mode || 'window';
      constraints = hasConstraints && constraints || {
        video: {
          mozMediaSource: mode,
          mediaSource: mode
        }
      };
      getUserMedia(constraints, function (err, stream) {
        callback(err, stream);

        if (err) {
          return;
        } // workaround for https://bugzilla.mozilla.org/show_bug.cgi?id=1045810


        var lastTime = stream.currentTime;
        var polly = window.setInterval(function () {
          if (!stream) {
            window.clearInterval(polly);
          }

          if (stream.currentTime === lastTime) {
            window.clearInterval(polly);

            if (stream.onended) {
              stream.onended();
            }
          }

          lastTime = stream.currentTime;
        }, 500);
      });
    } else {
      error = new Error('NavigatorUserMediaError');
      error.name = 'FF52_REQUIRED';
      return callback(error);
    }
  }
};

typeof window !== 'undefined' && window.addEventListener('message', function (event) {
  if (event.origin !== window.location.origin && !event.isTrusted) {
    return;
  }

  if (event.data.type === 'gotScreen' && cache[event.data.id]) {
    var data = cache[event.data.id];
    var constraints = data[1];
    var callback = data[0];
    delete cache[event.data.id];

    if (event.data.sourceId === '') {
      // user canceled
      var error = new Error('NavigatorUserMediaError');
      error.name = 'PERMISSION_DENIED';
      callback(error);
    } else {
      constraints = constraints || {
        audio: false,
        video: {
          mandatory: {
            chromeMediaSource: 'desktop',
            maxWidth: window.screen.width,
            maxHeight: window.screen.height,
            maxFrameRate: 3
          },
          optional: [{
            googLeakyBucket: true
          }, {
            googTemporalLayeredScreencast: true
          }]
        }
      };
      constraints.video.mandatory.chromeMediaSourceId = event.data.sourceId;
      getUserMedia(constraints, callback);
    }
  } else if (event.data.type === 'getScreenPending') {
    window.clearTimeout(event.data.id);
  }
});

},{}],2:[function(require,module,exports){
"use strict";

/* global module */
var util = require('util');

var hark = require('hark');

var getScreenMedia = require('./getscreenmedia');

var WildEmitter = require('wildemitter');

var mockconsole = require('mockconsole');

function isAllTracksEnded(stream) {
  var isAllTracksEnded = true;
  stream.getTracks().forEach(function (t) {
    isAllTracksEnded = t.readyState === 'ended' && isAllTracksEnded;
  });
  return isAllTracksEnded;
}

function LocalMedia(opts) {
  WildEmitter.call(this);
  var config = this.config = {
    detectSpeakingEvents: false,
    audioFallback: false,
    media: {
      audio: true,
      video: true
    },
    harkOptions: null,
    logger: mockconsole
  };
  var item;

  for (item in opts) {
    if (opts.hasOwnProperty(item)) {
      this.config[item] = opts[item];
    }
  }

  this.logger = config.logger;
  this._log = this.logger.log.bind(this.logger, 'LocalMedia:');
  this._logerror = this.logger.error.bind(this.logger, 'LocalMedia:');
  this.localStreams = [];
  this.localScreens = [];

  if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
    this._logerror('Your browser does not support local media capture.');
  }

  this._audioMonitors = [];
  this.on('localStreamStopped', this._stopAudioMonitor.bind(this));
  this.on('localScreenStopped', this._stopAudioMonitor.bind(this));
}

util.inherits(LocalMedia, WildEmitter);

LocalMedia.prototype.start = function (mediaConstraints, cb) {
  var self = this;
  var constraints = mediaConstraints || this.config.media;

  if (!navigator || !navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
    var error = new Error('MediaStreamError');
    error.name = 'NotSupportedError';

    if (cb) {
      return cb(error, null);
    }

    return;
  }

  this.emit('localStreamRequested', constraints);
  navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
    // Although the promise should be resolved only if all the constraints
    // are met Edge resolves it if both audio and video are requested but
    // only audio is available.
    if (constraints.video && stream.getVideoTracks().length === 0) {
      constraints.video = false;
      self.start(constraints, cb);
      return;
    }

    if (constraints.audio && self.config.detectSpeakingEvents) {
      self._setupAudioMonitor(stream, self.config.harkOptions);
    }

    self.localStreams.push(stream);
    stream.getTracks().forEach(function (track) {
      track.addEventListener('ended', function () {
        if (isAllTracksEnded(stream)) {
          self._removeStream(stream);
        }
      });
    });
    self.emit('localStream', stream);

    if (cb) {
      return cb(null, stream);
    }
  })["catch"](function (err) {
    // Fallback for users without a camera
    if (self.config.audioFallback && err.name === 'NotFoundError' && constraints.video !== false) {
      constraints.video = false;
      self.start(constraints, cb);
      return;
    }

    self.emit('localStreamRequestFailed', constraints);

    if (cb) {
      return cb(err, null);
    }
  });
};

LocalMedia.prototype.stop = function (stream) {
  this.stopStream(stream);
  this.stopScreenShare(stream);
};

LocalMedia.prototype.stopStream = function (stream) {
  var self = this;

  if (stream) {
    var idx = this.localStreams.indexOf(stream);

    if (idx > -1) {
      stream.getTracks().forEach(function (track) {
        track.stop();
      });

      this._removeStream(stream);
    }
  } else {
    this.localStreams.forEach(function (stream) {
      stream.getTracks().forEach(function (track) {
        track.stop();
      });

      self._removeStream(stream);
    });
  }
};

LocalMedia.prototype.startScreenShare = function (mode, constraints, cb) {
  var self = this;
  this.emit('localScreenRequested');

  if (typeof constraints === 'function' && !cb) {
    cb = constraints;
    constraints = null;
  }

  getScreenMedia(mode, constraints, function (err, stream) {
    if (!err) {
      self.localScreens.push(stream);
      stream.getTracks().forEach(function (track) {
        track.addEventListener('ended', function () {
          var isAllTracksEnded = true;
          stream.getTracks().forEach(function (t) {
            isAllTracksEnded = t.readyState === 'ended' && isAllTracksEnded;
          });

          if (isAllTracksEnded) {
            self._removeStream(stream);
          }
        });
      });
      self.emit('localScreen', stream);
    } else {
      self.emit('localScreenRequestFailed');
    } // enable the callback


    if (cb) {
      return cb(err, stream);
    }
  });
};

LocalMedia.prototype.stopScreenShare = function (stream) {
  var self = this;

  if (stream) {
    var idx = this.localScreens.indexOf(stream);

    if (idx > -1) {
      stream.getTracks().forEach(function (track) {
        track.stop();
      });

      this._removeStream(stream);
    }
  } else {
    this.localScreens.forEach(function (stream) {
      stream.getTracks().forEach(function (track) {
        track.stop();
      });

      self._removeStream(stream);
    });
  }
}; // Audio controls


LocalMedia.prototype.mute = function () {
  this._audioEnabled(false);

  this.emit('audioOff');
};

LocalMedia.prototype.unmute = function () {
  this._audioEnabled(true);

  this.emit('audioOn');
}; // Video controls


LocalMedia.prototype.pauseVideo = function () {
  this._videoEnabled(false);

  this.emit('videoOff');
};

LocalMedia.prototype.resumeVideo = function () {
  this._videoEnabled(true);

  this.emit('videoOn');
}; // Combined controls


LocalMedia.prototype.pause = function () {
  this.mute();
  this.pauseVideo();
};

LocalMedia.prototype.resume = function () {
  this.unmute();
  this.resumeVideo();
}; // Internal methods for enabling/disabling audio/video


LocalMedia.prototype._audioEnabled = function (bool) {
  this.localStreams.forEach(function (stream) {
    stream.getAudioTracks().forEach(function (track) {
      track.enabled = !!bool;
    });
  });
};

LocalMedia.prototype._videoEnabled = function (bool) {
  this.localStreams.forEach(function (stream) {
    stream.getVideoTracks().forEach(function (track) {
      track.enabled = !!bool;
    });
  });
}; // check if all audio streams are enabled


LocalMedia.prototype.isAudioEnabled = function () {
  var enabled = true;
  var hasAudioTracks = false;
  this.localStreams.forEach(function (stream) {
    var audioTracks = stream.getAudioTracks();

    if (audioTracks.length > 0) {
      hasAudioTracks = true;
      audioTracks.forEach(function (track) {
        enabled = enabled && track.enabled;
      });
    }
  }); // If no audioTracks were found, that means there is no microphone device.
  // In that case, isAudioEnabled should return false.

  if (!hasAudioTracks) {
    return false;
  }

  return enabled;
}; // check if all video streams are enabled


LocalMedia.prototype.isVideoEnabled = function () {
  var enabled = true;
  var hasVideoTracks = false;
  this.localStreams.forEach(function (stream) {
    var videoTracks = stream.getVideoTracks();

    if (videoTracks.length > 0) {
      hasVideoTracks = true;
      videoTracks.forEach(function (track) {
        enabled = enabled && track.enabled;
      });
    }
  }); // If no videoTracks were found, that means there is no camera device.
  // In that case, isVideoEnabled should return false.

  if (!hasVideoTracks) {
    return false;
  }

  return enabled;
};

LocalMedia.prototype._removeStream = function (stream) {
  var idx = this.localStreams.indexOf(stream);

  if (idx > -1) {
    this.localStreams.splice(idx, 1);
    this.emit('localStreamStopped', stream);
  } else {
    idx = this.localScreens.indexOf(stream);

    if (idx > -1) {
      this.localScreens.splice(idx, 1);
      this.emit('localScreenStopped', stream);
    }
  }
};

LocalMedia.prototype._setupAudioMonitor = function (stream, harkOptions) {
  this._log('Setup audio');

  var audio = hark(stream, harkOptions);
  var self = this;
  var timeout;
  audio.on('speaking', function () {
    self.emit('speaking');
  });
  audio.on('stopped_speaking', function () {
    if (timeout) {
      clearTimeout(timeout);
    }

    timeout = setTimeout(function () {
      self.emit('stoppedSpeaking');
    }, 1000);
  });
  audio.on('volume_change', function (volume, threshold) {
    self.emit('volumeChange', volume, threshold);
  });

  this._audioMonitors.push({
    audio: audio,
    stream: stream
  });
};

LocalMedia.prototype._stopAudioMonitor = function (stream) {
  var idx = -1;

  this._audioMonitors.forEach(function (monitors, i) {
    if (monitors.stream === stream) {
      idx = i;
    }
  });

  if (idx > -1) {
    this._audioMonitors[idx].audio.stop();

    this._audioMonitors.splice(idx, 1);
  }
}; // fallback for old .localScreen behaviour


Object.defineProperty(LocalMedia.prototype, 'localScreen', {
  get: function get() {
    return this.localScreens.length > 0 ? this.localScreens[0] : null;
  }
});
module.exports = LocalMedia;

},{"./getscreenmedia":1,"hark":9,"mockconsole":11,"util":8,"wildemitter":31}],3:[function(require,module,exports){
"use strict";

/* global module */
var util = require('util');

var webrtcSupport = require('webrtcsupport');

var WildEmitter = require('wildemitter');

function isAllTracksEnded(stream) {
  var isAllTracksEnded = true;
  stream.getTracks().forEach(function (t) {
    isAllTracksEnded = t.readyState === 'ended' && isAllTracksEnded;
  });
  return isAllTracksEnded;
}

function Peer(options) {
  var self = this; // call emitter constructor

  WildEmitter.call(this);
  this.id = options.id;
  this.parent = options.parent;
  this.type = options.type || 'video';
  this.oneway = options.oneway || false;
  this.sharemyscreen = options.sharemyscreen || false;
  this.browserPrefix = options.prefix;
  this.stream = options.stream;
  this.sendVideoIfAvailable = options.sendVideoIfAvailable === undefined ? true : options.sendVideoIfAvailable;
  this.enableDataChannels = options.enableDataChannels === undefined ? this.parent.config.enableDataChannels : options.enableDataChannels;
  this.receiveMedia = options.receiveMedia || this.parent.config.receiveMedia;
  this.channels = {};
  this.pendingDCMessages = []; // key (datachannel label) -> value (array[pending messages])

  this.sid = options.sid || Date.now().toString();
  this.pc = new RTCPeerConnection(this.parent.config.peerConnectionConfig);
  this.pc.addEventListener('icecandidate', this.onIceCandidate.bind(this));
  this.pc.addEventListener('endofcandidates', function (event) {
    self.send('endOfCandidates', event);
  });
  this.pc.addEventListener('addstream', this.handleRemoteStreamAdded.bind(this));
  this.pc.addEventListener('datachannel', this.handleDataChannelAdded.bind(this));
  this.pc.addEventListener('removestream', this.handleStreamRemoved.bind(this)); // Just fire negotiation needed events for now
  // When browser re-negotiation handling seems to work
  // we can use this as the trigger for starting the offer/answer process
  // automatically. We'll just leave it be for now while this stabalizes.

  this.pc.addEventListener('negotiationneeded', this.emit.bind(this, 'negotiationNeeded'));
  this.pc.addEventListener('iceconnectionstatechange', this.emit.bind(this, 'iceConnectionStateChange'));
  this.pc.addEventListener('iceconnectionstatechange', function () {
    switch (self.pc.iceConnectionState) {
      case 'failed':
        // currently, in chrome only the initiator goes to failed
        // so we need to signal this to the peer
        if (self.pc.localDescription.type === 'offer') {
          self.parent.emit('iceFailed', self);
          self.send('connectivityError');
        }

        break;
    }
  });
  this.pc.addEventListener('signalingstatechange', this.emit.bind(this, 'signalingStateChange'));
  this.logger = this.parent.logger; // handle screensharing/broadcast mode

  if (options.type === 'screen') {
    if (this.parent.localScreen && this.sharemyscreen) {
      this.logger.log('adding local screen stream to peer connection');
      this.pc.addStream(this.parent.localScreen);
      this.broadcaster = options.broadcaster;
    }
  } else {
    this.parent.localStreams.forEach(function (stream) {
      stream.getTracks().forEach(function (track) {
        if (track.kind !== 'video' || self.sendVideoIfAvailable) {
          self.pc.addTrack(track, stream);
        }
      });
    });
  } // proxy events to parent


  this.on('*', function () {
    self.parent.emit.apply(self.parent, arguments);
  });
}

util.inherits(Peer, WildEmitter);

Peer.prototype.offer = function (options) {
  this.pc.createOffer(options).then(function (offer) {
    this.pc.setLocalDescription(offer).then(function () {
      if (this.parent.config.nick) {
        // The offer is a RTCSessionDescription that only serializes
        // its own attributes to JSON, so if extra attributes are needed
        // a regular object has to be sent instead.
        offer = {
          type: offer.type,
          sdp: offer.sdp,
          nick: this.parent.config.nick
        };
      }

      this.send('offer', offer);
    }.bind(this))["catch"](function (error) {
      console.warn("setLocalDescription for offer failed: ", error);
    }.bind(this));
  }.bind(this))["catch"](function (error) {
    console.warn("createOffer failed: ", error);
  }.bind(this));
};

Peer.prototype.handleOffer = function (offer) {
  this.pc.setRemoteDescription(offer).then(function () {
    this.answer();
  }.bind(this))["catch"](function (error) {
    console.warn("setRemoteDescription for offer failed: ", error);
  }.bind(this));
};

Peer.prototype.answer = function () {
  this.pc.createAnswer().then(function (answer) {
    this.pc.setLocalDescription(answer).then(function () {
      if (this.parent.config.nick) {
        // The answer is a RTCSessionDescription that only serializes
        // its own attributes to JSON, so if extra attributes are needed
        // a regular object has to be sent instead.
        answer = {
          type: answer.type,
          sdp: answer.sdp,
          nick: this.parent.config.nick
        };
      }

      this.send('answer', answer);
    }.bind(this))["catch"](function (error) {
      console.warn("setLocalDescription for answer failed: ", error);
    }.bind(this));
  }.bind(this))["catch"](function (error) {
    console.warn("createAnswer failed: ", error);
  }.bind(this));
};

Peer.prototype.handleAnswer = function (answer) {
  this.pc.setRemoteDescription(answer)["catch"](function (error) {
    console.warn("setRemoteDescription for answer failed: ", error);
  }.bind(this));
};

Peer.prototype.handleMessage = function (message) {
  var self = this;
  this.logger.log('getting', message.type, message);

  if (message.prefix) {
    this.browserPrefix = message.prefix;
  }

  if (message.type === 'offer') {
    if (!this.nick) {
      this.nick = message.payload.nick;
    }

    delete message.payload.nick;
    this.handleOffer(message.payload);
  } else if (message.type === 'answer') {
    if (!this.nick) {
      this.nick = message.payload.nick;
    }

    delete message.payload.nick;
    this.handleAnswer(message.payload);
  } else if (message.type === 'candidate') {
    this.pc.addIceCandidate(message.payload.candidate);
  } else if (message.type === 'connectivityError') {
    this.parent.emit('connectivityError', self);
  } else if (message.type === 'mute') {
    this.parent.emit('mute', {
      id: message.from,
      name: message.payload.name
    });
  } else if (message.type === 'unmute') {
    this.parent.emit('unmute', {
      id: message.from,
      name: message.payload.name
    });
  } else if (message.type === 'endOfCandidates') {
    this.pc.addIceCandidate('');
  } else if (message.type === 'unshareScreen') {
    this.parent.emit('unshareScreen', {
      id: message.from
    });
    this.end();
  }
}; // send via signalling channel


Peer.prototype.send = function (messageType, payload) {
  var message = {
    to: this.id,
    sid: this.sid,
    broadcaster: this.broadcaster,
    roomType: this.type,
    type: messageType,
    payload: payload,
    prefix: webrtcSupport.prefix
  };
  this.logger.log('sending', messageType, message);
  this.parent.emit('message', message);
}; // send via data channel
// returns true when message was sent and false if channel is not open


Peer.prototype.sendDirectly = function (channel, messageType, payload) {
  var message = {
    type: messageType,
    payload: payload
  };
  this.logger.log('sending via datachannel', channel, messageType, message);
  var dc = this.getDataChannel(channel);

  if (dc.readyState !== 'open') {
    if (!this.pendingDCMessages.hasOwnProperty(channel)) {
      this.pendingDCMessages[channel] = [];
    }

    this.pendingDCMessages[channel].push(message);
    return false;
  }

  dc.send(JSON.stringify(message));
  return true;
}; // Internal method registering handlers for a data channel and emitting events on the peer


Peer.prototype._observeDataChannel = function (channel) {
  var self = this;
  channel.onclose = this.emit.bind(this, 'channelClose', channel);
  channel.onerror = this.emit.bind(this, 'channelError', channel);

  channel.onmessage = function (event) {
    self.emit('channelMessage', self, channel.label, JSON.parse(event.data), channel, event);
  };

  channel.onopen = function () {
    self.emit('channelOpen', channel); // Check if there are messages that could not be send

    if (self.pendingDCMessages.hasOwnProperty(channel.label)) {
      var pendingMessages = self.pendingDCMessages[channel.label];

      for (var i = 0; i < pendingMessages.length; i++) {
        self.sendDirectly(channel.label, pendingMessages[i].type, pendingMessages[i].payload);
      }

      self.pendingDCMessages[channel.label] = [];
    }
  };
}; // Fetch or create a data channel by the given name


Peer.prototype.getDataChannel = function (name, opts) {
  if (!webrtcSupport.supportDataChannel) {
    return this.emit('error', new Error('createDataChannel not supported'));
  }

  var channel = this.channels[name];
  opts || (opts = {});

  if (channel) {
    return channel;
  } // if we don't have one by this label, create it


  channel = this.channels[name] = this.pc.createDataChannel(name, opts);

  this._observeDataChannel(channel);

  return channel;
};

Peer.prototype.onIceCandidate = function (event) {
  var candidate = event.candidate;

  if (this.closed) {
    return;
  }

  if (candidate) {
    var pcConfig = this.parent.config.peerConnectionConfig;

    if (webrtcSupport.prefix === 'moz' && pcConfig && pcConfig.iceTransports && candidate.candidate && candidate.candidate.candidate && candidate.candidate.candidate.indexOf(pcConfig.iceTransports) < 0) {
      this.logger.log('Ignoring ice candidate not matching pcConfig iceTransports type: ', pcConfig.iceTransports);
    } else {
      // Retain legacy data structure for compatibility with
      // mobile clients.
      var expandedCandidate = {
        candidate: {
          candidate: candidate.candidate,
          sdpMid: candidate.sdpMid,
          sdpMLineIndex: candidate.sdpMLineIndex
        }
      };
      this.send('candidate', expandedCandidate);
    }
  } else {
    this.logger.log("End of candidates.");
  }
};

Peer.prototype.start = function () {
  // well, the webrtc api requires that we either
  // a) create a datachannel a priori
  // b) do a renegotiation later to add the SCTP m-line
  // Let's do (a) first...
  if (this.enableDataChannels) {
    this.getDataChannel('simplewebrtc');
  }

  this.offer(this.receiveMedia);
};

Peer.prototype.icerestart = function () {
  var constraints = this.receiveMedia;
  constraints.iceRestart = true;
  this.offer(constraints);
};

Peer.prototype.end = function () {
  if (this.closed) {
    return;
  }

  this.pc.close();
  this.handleStreamRemoved();
};

Peer.prototype.handleRemoteStreamAdded = function (event) {
  var self = this;

  if (this.stream) {
    this.logger.warn('Already have a remote stream');
  } else {
    this.stream = event.stream;
    this.stream.getTracks().forEach(function (track) {
      track.addEventListener('ended', function () {
        if (isAllTracksEnded(self.stream)) {
          self.end();
        }
      });
    });
    this.parent.emit('peerStreamAdded', this);
  }
};

Peer.prototype.handleStreamRemoved = function () {
  var peerIndex = this.parent.peers.indexOf(this);

  if (peerIndex > -1) {
    this.parent.peers.splice(peerIndex, 1);
    this.closed = true;
    this.parent.emit('peerStreamRemoved', this);
  }
};

Peer.prototype.handleDataChannelAdded = function (event) {
  var channel = event.channel;
  this.channels[channel.label] = channel;

  this._observeDataChannel(channel);
};

module.exports = Peer;

},{"util":8,"webrtcsupport":30,"wildemitter":31}],4:[function(require,module,exports){
"use strict";

/* global module */
var WebRTC = require('./webrtc');

var WildEmitter = require('wildemitter');

var webrtcSupport = require('webrtcsupport');

var attachMediaStream = require('attachmediastream');

var mockconsole = require('mockconsole');

function SimpleWebRTC(opts) {
  var self = this;
  var options = opts || {};
  var config = this.config = {
    socketio: {
      /* 'force new connection':true*/
    },
    connection: null,
    debug: false,
    localVideoEl: '',
    remoteVideosEl: '',
    enableDataChannels: true,
    autoRequestMedia: false,
    autoRemoveVideos: true,
    adjustPeerVolume: false,
    peerVolumeWhenSpeaking: 0.25,
    media: {
      video: true,
      audio: true
    },
    receiveMedia: {
      offerToReceiveAudio: 1,
      offerToReceiveVideo: 1
    },
    localVideo: {
      autoplay: true,
      mirror: true,
      muted: true
    }
  };
  var item, connection; // We also allow a 'logger' option. It can be any object that implements
  // log, warn, and error methods.
  // We log nothing by default, following "the rule of silence":
  // http://www.linfo.org/rule_of_silence.html

  this.logger = function () {
    // we assume that if you're in debug mode and you didn't
    // pass in a logger, you actually want to log as much as
    // possible.
    if (opts.debug) {
      return opts.logger || console;
    } else {
      // or we'll use your logger which should have its own logic
      // for output. Or we'll return the no-op.
      return opts.logger || mockconsole;
    }
  }(); // set our config from options


  for (item in options) {
    if (options.hasOwnProperty(item)) {
      this.config[item] = options[item];
    }
  } // Override screensharing support detection to fit the custom
  // "getScreenMedia" module.
  // Note that this is a coarse check; calling "getScreenMedia" may fail even
  // if "supportScreenSharing" is true.


  var screenSharingSupported = window.navigator.mediaDevices && window.navigator.mediaDevices.getDisplayMedia || window.navigator.webkitGetUserMedia || window.navigator.userAgent.match('Firefox');
  webrtcSupport.supportScreenSharing = window.location.protocol === 'https:' && screenSharingSupported; // attach detected support for convenience

  this.capabilities = webrtcSupport; // call WildEmitter constructor

  WildEmitter.call(this);

  if (this.config.connection === null) {
    throw 'no connection object given in the configuration';
  } else {
    connection = this.connection = this.config.connection;
  }

  connection.on('connect', function () {
    self.emit('connectionReady', connection.getSessionid());
    self.sessionReady = true;
    self.testReadiness();
  });
  connection.on('message', function (message) {
    var peers = self.webrtc.getPeers(message.from, message.roomType);
    var peer;

    if (message.type === 'offer') {
      if (peers.length) {
        peers.forEach(function (p) {
          if (p.sid === message.sid) {
            peer = p;
          }
        }); //if (!peer) peer = peers[0]; // fallback for old protocol versions
      }

      if (!peer) {
        peer = self.webrtc.createPeer({
          id: message.from,
          sid: message.sid,
          type: message.roomType,
          enableDataChannels: self.config.enableDataChannels && message.roomType !== 'screen',
          sharemyscreen: message.roomType === 'screen' && !message.broadcaster,
          broadcaster: message.roomType === 'screen' && !message.broadcaster ? self.connection.getSessionid() : null,
          sendVideoIfAvailable: self.connection.getSendVideoIfAvailable()
        });
        self.emit('createdPeer', peer);
      }

      peer.handleMessage(message);
    } else if (peers.length) {
      peers.forEach(function (peer) {
        if (message.sid) {
          if (peer.sid === message.sid) {
            peer.handleMessage(message);
          }
        } else {
          peer.handleMessage(message);
        }
      });
    }
  });
  connection.on('remove', function (room) {
    if (room.id !== self.connection.getSessionid()) {
      self.webrtc.removePeers(room.id, room.type);
    }
  }); // instantiate our main WebRTC helper
  // using same logger from logic here

  opts.logger = this.logger;
  opts.debug = false;
  this.webrtc = new WebRTC(opts); // attach a few methods from underlying lib to simple.

  ['mute', 'unmute', 'pauseVideo', 'resumeVideo', 'pause', 'resume', 'sendToAll', 'sendDirectlyToAll', 'getPeers', 'createPeer', 'removePeers'].forEach(function (method) {
    self[method] = self.webrtc[method].bind(self.webrtc);
  }); // proxy events from WebRTC

  this.webrtc.on('*', function () {
    self.emit.apply(self, arguments);
  }); // log all events in debug mode

  if (config.debug) {
    this.on('*', this.logger.log.bind(this.logger, 'SimpleWebRTC event:'));
  } // check for readiness


  this.webrtc.on('localStream', function () {
    self.testReadiness();
  });
  this.webrtc.on('message', function (payload) {
    self.connection.emit('message', payload);
  });
  this.webrtc.on('peerStreamAdded', this.handlePeerStreamAdded.bind(this));
  this.webrtc.on('peerStreamRemoved', this.handlePeerStreamRemoved.bind(this)); // echo cancellation attempts

  if (this.config.adjustPeerVolume) {
    this.webrtc.on('speaking', this.setVolumeForAll.bind(this, this.config.peerVolumeWhenSpeaking));
    this.webrtc.on('stoppedSpeaking', this.setVolumeForAll.bind(this, 1));
  }

  connection.on('stunservers', function (args) {
    // resets/overrides the config
    self.webrtc.config.peerConnectionConfig.iceServers = args;
    self.emit('stunservers', args);
  });
  connection.on('turnservers', function (args) {
    // appends to the config
    self.webrtc.config.peerConnectionConfig.iceServers = self.webrtc.config.peerConnectionConfig.iceServers.concat(args);
    self.emit('turnservers', args);
  });
  this.webrtc.on('iceFailed', function ()
  /*peer*/
  {// local ice failure
  });
  this.webrtc.on('connectivityError', function ()
  /*peer*/
  {// remote ice failure
  }); // sending mute/unmute to all peers

  this.webrtc.on('audioOn', function () {
    self.webrtc.sendToAll('unmute', {
      name: 'audio'
    });
  });
  this.webrtc.on('audioOff', function () {
    self.webrtc.sendToAll('mute', {
      name: 'audio'
    });
  });
  this.webrtc.on('videoOn', function () {
    self.webrtc.sendToAll('unmute', {
      name: 'video'
    });
  });
  this.webrtc.on('videoOff', function () {
    self.webrtc.sendToAll('mute', {
      name: 'video'
    });
  }); // screensharing events

  this.webrtc.on('localScreen', function (stream) {
    var el = document.createElement('video'),
        container = self.getRemoteVideoContainer();

    el.oncontextmenu = function () {
      return false;
    };

    el.id = 'localScreen';
    attachMediaStream(stream, el);

    if (container) {
      container.appendChild(el);
    }

    self.emit('localScreenAdded', el);
    self.connection.emit('shareScreen'); // NOTE: we don't create screen peers for existing video peers here,
    // this is done by the application code in "webrtc.js".
  });
  this.webrtc.on('localScreenStopped', function ()
  /*stream*/
  {
    self.stopScreenShare();
    /*
    self.connection.emit('unshareScreen');
    self.webrtc.peers.forEach(function (peer) {
    	if (peer.sharemyscreen) {
    		peer.end();
    	}
    });
    */
  });
}

SimpleWebRTC.prototype = Object.create(WildEmitter.prototype, {
  constructor: {
    value: SimpleWebRTC
  }
});

SimpleWebRTC.prototype.leaveCall = function () {
  if (this.roomName) {
    while (this.webrtc.peers.length) {
      this.webrtc.peers[0].end();
    }

    if (this.getLocalScreen()) {
      this.stopScreenShare();
    }

    this.emit('leftRoom', this.roomName);
    this.stopLocalVideo();
    this.roomName = undefined;
  }
};

SimpleWebRTC.prototype.disconnect = function () {
  this.connection.disconnect();
  delete this.connection;
};

SimpleWebRTC.prototype.handlePeerStreamAdded = function (peer) {
  var self = this;
  var container = this.getRemoteVideoContainer();
  var video = attachMediaStream(peer.stream); // At least Firefox, Opera and Edge move the video to a wrong position
  // instead of keeping it unchanged	when "transform: scaleX(1)" is used
  // ("transform: scaleX(-1)" is fine); as it should have no effect the
  // transform is removed.

  if (video.style.transform === 'scaleX(1)') {
    video.style.transform = '';
  } // store video element as part of peer for easy removal


  peer.videoEl = video;
  video.id = this.getDomId(peer);

  if (container) {
    container.appendChild(video);
  }

  this.emit('videoAdded', video, peer); // send our mute status to new peer if we're muted
  // currently called with a small delay because it arrives before
  // the video element is created otherwise (which happens after
  // the async setRemoteDescription-createAnswer)

  window.setTimeout(function () {
    if (!self.webrtc.isAudioEnabled()) {
      peer.send('mute', {
        name: 'audio'
      });
    }

    if (!self.webrtc.isVideoEnabled()) {
      peer.send('mute', {
        name: 'video'
      });
    }
  }, 250);
};

SimpleWebRTC.prototype.handlePeerStreamRemoved = function (peer) {
  var container = this.getRemoteVideoContainer();
  var videoEl = peer.videoEl;

  if (this.config.autoRemoveVideos && container && videoEl) {
    container.removeChild(videoEl);
  }

  if (videoEl) {
    this.emit('videoRemoved', videoEl, peer);
  }
};

SimpleWebRTC.prototype.getDomId = function (peer) {
  return [peer.id, peer.type, peer.broadcaster ? 'broadcasting' : 'incoming'].join('_');
}; // set volume on video tag for all peers takse a value between 0 and 1


SimpleWebRTC.prototype.setVolumeForAll = function (volume) {
  this.webrtc.peers.forEach(function (peer) {
    if (peer.videoEl) {
      peer.videoEl.volume = volume;
    }
  });
};

SimpleWebRTC.prototype.joinCall = function (name) {
  if (this.config.autoRequestMedia) {
    this.startLocalVideo();
  }

  this.roomName = name;
  this.emit('joinedRoom', name);
};

SimpleWebRTC.prototype.getEl = function (idOrEl) {
  if (typeof idOrEl === 'string') {
    return document.getElementById(idOrEl);
  } else {
    return idOrEl;
  }
};

SimpleWebRTC.prototype.startLocalVideo = function () {
  var self = this;
  this.webrtc.start(this.config.media, function (err, stream) {
    if (err) {
      self.emit('localMediaError', err);
    } else {
      self.emit('localMediaStarted', self.config.media);
      attachMediaStream(stream, self.getLocalVideoContainer(), self.config.localVideo);
    }
  });
};

SimpleWebRTC.prototype.stopLocalVideo = function () {
  this.webrtc.stop();
}; // this accepts either element ID or element
// and either the video tag itself or a container
// that will be used to put the video tag into.


SimpleWebRTC.prototype.getLocalVideoContainer = function () {
  var el = this.getEl(this.config.localVideoEl);

  if (el && el.tagName === 'VIDEO') {
    el.oncontextmenu = function () {
      return false;
    };

    return el;
  } else if (el) {
    var video = document.createElement('video');

    video.oncontextmenu = function () {
      return false;
    };

    el.appendChild(video);
    return video;
  } else {
    return;
  }
};

SimpleWebRTC.prototype.getRemoteVideoContainer = function () {
  return this.getEl(this.config.remoteVideosEl);
};

SimpleWebRTC.prototype.shareScreen = function (mode, cb) {
  this.webrtc.startScreenShare(mode, cb);
};

SimpleWebRTC.prototype.getLocalScreen = function () {
  return this.webrtc.localScreen;
};

SimpleWebRTC.prototype.stopScreenShare = function () {
  this.connection.emit('unshareScreen');
  var videoEl = document.getElementById('localScreen');
  var container = this.getRemoteVideoContainer();

  if (this.config.autoRemoveVideos && container && videoEl) {
    container.removeChild(videoEl);
  } // a hack to emit the event the removes the video
  // element that we want


  if (videoEl) {
    this.emit('videoRemoved', videoEl);
  }

  if (this.getLocalScreen()) {
    this.webrtc.stopScreenShare();
  } // Notify peers were sending to.


  this.webrtc.peers.forEach(function (peer) {
    if (peer.type === 'screen' && peer.sharemyscreen) {
      peer.send('unshareScreen');
    }

    if (peer.broadcaster) {
      peer.end();
    }
  });
};

SimpleWebRTC.prototype.testReadiness = function () {
  var self = this;

  if (this.sessionReady) {
    if (!this.config.media.video && !this.config.media.audio) {
      self.emit('readyToCall', self.connection.getSessionid());
    } else if (this.webrtc.localStreams.length > 0) {
      self.emit('readyToCall', self.connection.getSessionid());
    }
  }
};

SimpleWebRTC.prototype.createRoom = function (name, cb) {
  this.roomName = name;

  if (arguments.length === 2) {
    this.connection.emit('create', name, cb);
  } else {
    this.connection.emit('create', name);
  }
};

module.exports = SimpleWebRTC;

},{"./webrtc":5,"attachmediastream":6,"mockconsole":11,"webrtcsupport":30,"wildemitter":31}],5:[function(require,module,exports){
"use strict";

/* global module */
var util = require('util');

var webrtcSupport = require('webrtcsupport');

var mockconsole = require('mockconsole');

var localMedia = require('./localmedia');

var Peer = require('./peer');

function WebRTC(opts) {
  var self = this;
  var options = opts || {};
  this.config = {
    debug: false,
    // makes the entire PC config overridable
    peerConnectionConfig: {
      iceServers: []
    },
    receiveMedia: {
      offerToReceiveAudio: 1,
      offerToReceiveVideo: 1
    },
    enableDataChannels: true
  };
  var item; // We also allow a 'logger' option. It can be any object that implements
  // log, warn, and error methods.
  // We log nothing by default, following "the rule of silence":
  // http://www.linfo.org/rule_of_silence.html

  this.logger = function () {
    // we assume that if you're in debug mode and you didn't
    // pass in a logger, you actually want to log as much as
    // possible.
    if (opts.debug) {
      return opts.logger || console;
    } else {
      // or we'll use your logger which should have its own logic
      // for output. Or we'll return the no-op.
      return opts.logger || mockconsole;
    }
  }(); // set options


  for (item in options) {
    if (options.hasOwnProperty(item)) {
      this.config[item] = options[item];
    }
  } // check for support


  if (!webrtcSupport.support) {
    this.logger.error('Your browser doesn\'t seem to support WebRTC');
  } // where we'll store our peer connections


  this.peers = []; // call localMedia constructor

  localMedia.call(this, this.config);
  this.on('speaking', function () {
    if (!self.hardMuted) {
      // FIXME: should use sendDirectlyToAll, but currently has different semantics wrt payload
      self.peers.forEach(function (peer) {
        if (peer.enableDataChannels) {
          var dc = peer.getDataChannel('hark');

          if (dc.readyState !== 'open') {
            return;
          }

          dc.send(JSON.stringify({
            type: 'speaking'
          }));
        }
      });
    }
  });
  this.on('stoppedSpeaking', function () {
    if (!self.hardMuted) {
      // FIXME: should use sendDirectlyToAll, but currently has different semantics wrt payload
      self.peers.forEach(function (peer) {
        if (peer.enableDataChannels) {
          var dc = peer.getDataChannel('hark');

          if (dc.readyState !== 'open') {
            return;
          }

          dc.send(JSON.stringify({
            type: 'stoppedSpeaking'
          }));
        }
      });
    }
  });
  this.on('unshareScreen', function (message) {
    // End peers we were receiving the screensharing stream from.
    var peers = self.getPeers(message.from, 'screen');
    peers.forEach(function (peer) {
      if (!peer.sharemyscreen) {
        peer.end();
      }
    });
  }); // log events in debug mode

  if (this.config.debug) {
    this.on('*', function (event, val1, val2) {
      var logger; // if you didn't pass in a logger and you explicitly turning on debug
      // we're just going to assume you're wanting log output with console

      if (self.config.logger === mockconsole) {
        logger = console;
      } else {
        logger = self.logger;
      }

      logger.log('event:', event, val1, val2);
    });
  }
}

util.inherits(WebRTC, localMedia);

WebRTC.prototype.createPeer = function (opts) {
  var peer;
  opts.parent = this;
  peer = new Peer(opts);
  this.peers.push(peer);
  return peer;
}; // removes peers


WebRTC.prototype.removePeers = function (id, type) {
  this.getPeers(id, type).forEach(function (peer) {
    peer.end();
  });
}; // fetches all Peer objects by session id and/or type


WebRTC.prototype.getPeers = function (sessionId, type) {
  return this.peers.filter(function (peer) {
    return (!sessionId || peer.id === sessionId) && (!type || peer.type === type);
  });
}; // sends message to all


WebRTC.prototype.sendToAll = function (message, payload) {
  this.peers.forEach(function (peer) {
    peer.send(message, payload);
  });
}; // sends message to all using a datachannel
// only sends to anyone who has an open datachannel


WebRTC.prototype.sendDirectlyToAll = function (channel, message, payload) {
  this.peers.forEach(function (peer) {
    if (peer.enableDataChannels) {
      peer.sendDirectly(channel, message, payload);
    }
  });
};

module.exports = WebRTC;

},{"./localmedia":2,"./peer":3,"mockconsole":11,"util":8,"webrtcsupport":30}],6:[function(require,module,exports){
"use strict";

var adapter = require('webrtc-adapter');

module.exports = function (stream, el, options) {
  var item;
  var element = el;
  var opts = {
    autoplay: true,
    mirror: false,
    muted: false,
    audio: false,
    disableContextMenu: false
  };

  if (options) {
    for (item in options) {
      opts[item] = options[item];
    }
  }

  if (!element) {
    element = document.createElement(opts.audio ? 'audio' : 'video');
  } else if (element.tagName.toLowerCase() === 'audio') {
    opts.audio = true;
  }

  if (opts.disableContextMenu) {
    element.oncontextmenu = function (e) {
      e.preventDefault();
    };
  }

  if (opts.autoplay) element.autoplay = 'autoplay';
  element.muted = !!opts.muted;

  if (!opts.audio) {
    ['', 'moz', 'webkit', 'o', 'ms'].forEach(function (prefix) {
      var styleName = prefix ? prefix + 'Transform' : 'transform';
      element.style[styleName] = opts.mirror ? 'scaleX(-1)' : 'scaleX(1)';
    });
  }

  if (adapter.browserDetails.browser === 'safari') {
    element.setAttribute('playsinline', true);
  }

  element.srcObject = stream;
  return element;
};

},{"webrtc-adapter":15}],7:[function(require,module,exports){
"use strict";

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

module.exports = function isBuffer(arg) {
  return arg && _typeof(arg) === 'object' && typeof arg.copy === 'function' && typeof arg.fill === 'function' && typeof arg.readUInt8 === 'function';
};

},{}],8:[function(require,module,exports){
(function (process,global){
"use strict";

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
var formatRegExp = /%[sdj%]/g;

exports.format = function (f) {
  if (!isString(f)) {
    var objects = [];

    for (var i = 0; i < arguments.length; i++) {
      objects.push(inspect(arguments[i]));
    }

    return objects.join(' ');
  }

  var i = 1;
  var args = arguments;
  var len = args.length;
  var str = String(f).replace(formatRegExp, function (x) {
    if (x === '%%') return '%';
    if (i >= len) return x;

    switch (x) {
      case '%s':
        return String(args[i++]);

      case '%d':
        return Number(args[i++]);

      case '%j':
        try {
          return JSON.stringify(args[i++]);
        } catch (_) {
          return '[Circular]';
        }

      default:
        return x;
    }
  });

  for (var x = args[i]; i < len; x = args[++i]) {
    if (isNull(x) || !isObject(x)) {
      str += ' ' + x;
    } else {
      str += ' ' + inspect(x);
    }
  }

  return str;
}; // Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.


exports.deprecate = function (fn, msg) {
  // Allow for deprecating things in the process of starting up.
  if (isUndefined(global.process)) {
    return function () {
      return exports.deprecate(fn, msg).apply(this, arguments);
    };
  }

  if (process.noDeprecation === true) {
    return fn;
  }

  var warned = false;

  function deprecated() {
    if (!warned) {
      if (process.throwDeprecation) {
        throw new Error(msg);
      } else if (process.traceDeprecation) {
        console.trace(msg);
      } else {
        console.error(msg);
      }

      warned = true;
    }

    return fn.apply(this, arguments);
  }

  return deprecated;
};

var debugs = {};
var debugEnviron;

exports.debuglog = function (set) {
  if (isUndefined(debugEnviron)) debugEnviron = process.env.NODE_DEBUG || '';
  set = set.toUpperCase();

  if (!debugs[set]) {
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
      var pid = process.pid;

      debugs[set] = function () {
        var msg = exports.format.apply(exports, arguments);
        console.error('%s %d: %s', set, pid, msg);
      };
    } else {
      debugs[set] = function () {};
    }
  }

  return debugs[set];
};
/**
 * Echos the value of a value. Trys to print the value out
 * in the best way possible given the different types.
 *
 * @param {Object} obj The object to print out.
 * @param {Object} opts Optional options object that alters the output.
 */

/* legacy: obj, showHidden, depth, colors*/


function inspect(obj, opts) {
  // default options
  var ctx = {
    seen: [],
    stylize: stylizeNoColor
  }; // legacy...

  if (arguments.length >= 3) ctx.depth = arguments[2];
  if (arguments.length >= 4) ctx.colors = arguments[3];

  if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
  } else if (opts) {
    // got an "options" object
    exports._extend(ctx, opts);
  } // set default options


  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  if (isUndefined(ctx.depth)) ctx.depth = 2;
  if (isUndefined(ctx.colors)) ctx.colors = false;
  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  return formatValue(ctx, obj, ctx.depth);
}

exports.inspect = inspect; // http://en.wikipedia.org/wiki/ANSI_escape_code#graphics

inspect.colors = {
  'bold': [1, 22],
  'italic': [3, 23],
  'underline': [4, 24],
  'inverse': [7, 27],
  'white': [37, 39],
  'grey': [90, 39],
  'black': [30, 39],
  'blue': [34, 39],
  'cyan': [36, 39],
  'green': [32, 39],
  'magenta': [35, 39],
  'red': [31, 39],
  'yellow': [33, 39]
}; // Don't use 'blue' not visible on cmd.exe

inspect.styles = {
  'special': 'cyan',
  'number': 'yellow',
  'boolean': 'yellow',
  'undefined': 'grey',
  'null': 'bold',
  'string': 'green',
  'date': 'magenta',
  // "name": intentionally not styling
  'regexp': 'red'
};

function stylizeWithColor(str, styleType) {
  var style = inspect.styles[styleType];

  if (style) {
    return "\x1B[" + inspect.colors[style][0] + 'm' + str + "\x1B[" + inspect.colors[style][1] + 'm';
  } else {
    return str;
  }
}

function stylizeNoColor(str, styleType) {
  return str;
}

function arrayToHash(array) {
  var hash = {};
  array.forEach(function (val, idx) {
    hash[val] = true;
  });
  return hash;
}

function formatValue(ctx, value, recurseTimes) {
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it
  if (ctx.customInspect && value && isFunction(value.inspect) && // Filter out the util module, it's inspect function is special
  value.inspect !== exports.inspect && // Also filter out any prototype objects using the circular check.
  !(value.constructor && value.constructor.prototype === value)) {
    var ret = value.inspect(recurseTimes, ctx);

    if (!isString(ret)) {
      ret = formatValue(ctx, ret, recurseTimes);
    }

    return ret;
  } // Primitive types cannot have properties


  var primitive = formatPrimitive(ctx, value);

  if (primitive) {
    return primitive;
  } // Look up the keys of the object.


  var keys = Object.keys(value);
  var visibleKeys = arrayToHash(keys);

  if (ctx.showHidden) {
    keys = Object.getOwnPropertyNames(value);
  } // IE doesn't make error fields non-enumerable
  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx


  if (isError(value) && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
    return formatError(value);
  } // Some type of object without properties can be shortcutted.


  if (keys.length === 0) {
    if (isFunction(value)) {
      var name = value.name ? ': ' + value.name : '';
      return ctx.stylize('[Function' + name + ']', 'special');
    }

    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    }

    if (isDate(value)) {
      return ctx.stylize(Date.prototype.toString.call(value), 'date');
    }

    if (isError(value)) {
      return formatError(value);
    }
  }

  var base = '',
      array = false,
      braces = ['{', '}']; // Make Array say that they are Array

  if (isArray(value)) {
    array = true;
    braces = ['[', ']'];
  } // Make functions say that they are functions


  if (isFunction(value)) {
    var n = value.name ? ': ' + value.name : '';
    base = ' [Function' + n + ']';
  } // Make RegExps say that they are RegExps


  if (isRegExp(value)) {
    base = ' ' + RegExp.prototype.toString.call(value);
  } // Make dates with properties first say the date


  if (isDate(value)) {
    base = ' ' + Date.prototype.toUTCString.call(value);
  } // Make error with message first say the error


  if (isError(value)) {
    base = ' ' + formatError(value);
  }

  if (keys.length === 0 && (!array || value.length == 0)) {
    return braces[0] + base + braces[1];
  }

  if (recurseTimes < 0) {
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    } else {
      return ctx.stylize('[Object]', 'special');
    }
  }

  ctx.seen.push(value);
  var output;

  if (array) {
    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  } else {
    output = keys.map(function (key) {
      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
    });
  }

  ctx.seen.pop();
  return reduceToSingleString(output, base, braces);
}

function formatPrimitive(ctx, value) {
  if (isUndefined(value)) return ctx.stylize('undefined', 'undefined');

  if (isString(value)) {
    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '').replace(/'/g, "\\'").replace(/\\"/g, '"') + '\'';
    return ctx.stylize(simple, 'string');
  }

  if (isNumber(value)) return ctx.stylize('' + value, 'number');
  if (isBoolean(value)) return ctx.stylize('' + value, 'boolean'); // For some reason typeof null is "object", so special case here.

  if (isNull(value)) return ctx.stylize('null', 'null');
}

function formatError(value) {
  return '[' + Error.prototype.toString.call(value) + ']';
}

function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  var output = [];

  for (var i = 0, l = value.length; i < l; ++i) {
    if (hasOwnProperty(value, String(i))) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys, String(i), true));
    } else {
      output.push('');
    }
  }

  keys.forEach(function (key) {
    if (!key.match(/^\d+$/)) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys, key, true));
    }
  });
  return output;
}

function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  var name, str, desc;
  desc = Object.getOwnPropertyDescriptor(value, key) || {
    value: value[key]
  };

  if (desc.get) {
    if (desc.set) {
      str = ctx.stylize('[Getter/Setter]', 'special');
    } else {
      str = ctx.stylize('[Getter]', 'special');
    }
  } else {
    if (desc.set) {
      str = ctx.stylize('[Setter]', 'special');
    }
  }

  if (!hasOwnProperty(visibleKeys, key)) {
    name = '[' + key + ']';
  }

  if (!str) {
    if (ctx.seen.indexOf(desc.value) < 0) {
      if (isNull(recurseTimes)) {
        str = formatValue(ctx, desc.value, null);
      } else {
        str = formatValue(ctx, desc.value, recurseTimes - 1);
      }

      if (str.indexOf('\n') > -1) {
        if (array) {
          str = str.split('\n').map(function (line) {
            return '  ' + line;
          }).join('\n').substr(2);
        } else {
          str = '\n' + str.split('\n').map(function (line) {
            return '   ' + line;
          }).join('\n');
        }
      }
    } else {
      str = ctx.stylize('[Circular]', 'special');
    }
  }

  if (isUndefined(name)) {
    if (array && key.match(/^\d+$/)) {
      return str;
    }

    name = JSON.stringify('' + key);

    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
      name = name.substr(1, name.length - 2);
      name = ctx.stylize(name, 'name');
    } else {
      name = name.replace(/'/g, "\\'").replace(/\\"/g, '"').replace(/(^"|"$)/g, "'");
      name = ctx.stylize(name, 'string');
    }
  }

  return name + ': ' + str;
}

function reduceToSingleString(output, base, braces) {
  var numLinesEst = 0;
  var length = output.reduce(function (prev, cur) {
    numLinesEst++;
    if (cur.indexOf('\n') >= 0) numLinesEst++;
    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  }, 0);

  if (length > 60) {
    return braces[0] + (base === '' ? '' : base + '\n ') + ' ' + output.join(',\n  ') + ' ' + braces[1];
  }

  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
} // NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.


function isArray(ar) {
  return Array.isArray(ar);
}

exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}

exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}

exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}

exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}

exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}

exports.isString = isString;

function isSymbol(arg) {
  return _typeof(arg) === 'symbol';
}

exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}

exports.isUndefined = isUndefined;

function isRegExp(re) {
  return isObject(re) && objectToString(re) === '[object RegExp]';
}

exports.isRegExp = isRegExp;

function isObject(arg) {
  return _typeof(arg) === 'object' && arg !== null;
}

exports.isObject = isObject;

function isDate(d) {
  return isObject(d) && objectToString(d) === '[object Date]';
}

exports.isDate = isDate;

function isError(e) {
  return isObject(e) && (objectToString(e) === '[object Error]' || e instanceof Error);
}

exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}

exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null || typeof arg === 'boolean' || typeof arg === 'number' || typeof arg === 'string' || _typeof(arg) === 'symbol' || // ES6 symbol
  typeof arg === 'undefined';
}

exports.isPrimitive = isPrimitive;
exports.isBuffer = require('./support/isBuffer');

function objectToString(o) {
  return Object.prototype.toString.call(o);
}

function pad(n) {
  return n < 10 ? '0' + n.toString(10) : n.toString(10);
}

var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']; // 26 Feb 16:19:34

function timestamp() {
  var d = new Date();
  var time = [pad(d.getHours()), pad(d.getMinutes()), pad(d.getSeconds())].join(':');
  return [d.getDate(), months[d.getMonth()], time].join(' ');
} // log is just a thin wrapper to console.log that prepends a timestamp


exports.log = function () {
  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
};
/**
 * Inherit the prototype methods from one constructor into another.
 *
 * The Function.prototype.inherits from lang.js rewritten as a standalone
 * function (not on Function.prototype). NOTE: If this file is to be loaded
 * during bootstrapping this function needs to be rewritten using some native
 * functions as prototype setup using normal JavaScript does not work as
 * expected during bootstrapping (see mirror.js in r114903).
 *
 * @param {function} ctor Constructor function which needs to inherit the
 *     prototype.
 * @param {function} superCtor Constructor function to inherit prototype from.
 */


exports.inherits = require('inherits');

exports._extend = function (origin, add) {
  // Don't do anything if add isn't an object
  if (!add || !isObject(add)) return origin;
  var keys = Object.keys(add);
  var i = keys.length;

  while (i--) {
    origin[keys[i]] = add[keys[i]];
  }

  return origin;
};

function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./support/isBuffer":7,"_process":12,"inherits":10}],9:[function(require,module,exports){
"use strict";

var WildEmitter = require('wildemitter');

function getMaxVolume(analyser, fftBins) {
  var maxVolume = -Infinity;
  analyser.getFloatFrequencyData(fftBins);

  for (var i = 4, ii = fftBins.length; i < ii; i++) {
    if (fftBins[i] > maxVolume && fftBins[i] < 0) {
      maxVolume = fftBins[i];
    }
  }

  ;
  return maxVolume;
}

var audioContextType;

if (typeof window !== 'undefined') {
  audioContextType = window.AudioContext || window.webkitAudioContext;
} // use a single audio context due to hardware limits


var audioContext = null;

module.exports = function (stream, options) {
  var harker = new WildEmitter(); // make it not break in non-supported browsers

  if (!audioContextType) return harker; //Config

  var options = options || {},
      smoothing = options.smoothing || 0.1,
      interval = options.interval || 50,
      threshold = options.threshold,
      play = options.play,
      history = options.history || 10,
      running = true; // Ensure that just a single AudioContext is internally created

  audioContext = options.audioContext || audioContext || new audioContextType();
  var sourceNode, fftBins, analyser;
  analyser = audioContext.createAnalyser();
  analyser.fftSize = 512;
  analyser.smoothingTimeConstant = smoothing;
  fftBins = new Float32Array(analyser.frequencyBinCount);
  if (stream.jquery) stream = stream[0];

  if (stream instanceof HTMLAudioElement || stream instanceof HTMLVideoElement) {
    //Audio Tag
    sourceNode = audioContext.createMediaElementSource(stream);
    if (typeof play === 'undefined') play = true;
    threshold = threshold || -50;
  } else {
    //WebRTC Stream
    sourceNode = audioContext.createMediaStreamSource(stream);
    threshold = threshold || -50;
  }

  sourceNode.connect(analyser);
  if (play) analyser.connect(audioContext.destination);
  harker.speaking = false;

  harker.suspend = function () {
    return audioContext.suspend();
  };

  harker.resume = function () {
    return audioContext.resume();
  };

  Object.defineProperty(harker, 'state', {
    get: function get() {
      return audioContext.state;
    }
  });

  audioContext.onstatechange = function () {
    harker.emit('state_change', audioContext.state);
  };

  harker.setThreshold = function (t) {
    threshold = t;
  };

  harker.setInterval = function (i) {
    interval = i;
  };

  harker.stop = function () {
    running = false;
    harker.emit('volume_change', -100, threshold);

    if (harker.speaking) {
      harker.speaking = false;
      harker.emit('stopped_speaking');
    }

    analyser.disconnect();
    sourceNode.disconnect();
  };

  harker.speakingHistory = [];

  for (var i = 0; i < history; i++) {
    harker.speakingHistory.push(0);
  } // Poll the analyser node to determine if speaking
  // and emit events if changed


  var looper = function looper() {
    setTimeout(function () {
      //check if stop has been called
      if (!running) {
        return;
      }

      var currentVolume = getMaxVolume(analyser, fftBins);
      harker.emit('volume_change', currentVolume, threshold);
      var history = 0;

      if (currentVolume > threshold && !harker.speaking) {
        // trigger quickly, short history
        for (var i = harker.speakingHistory.length - 3; i < harker.speakingHistory.length; i++) {
          history += harker.speakingHistory[i];
        }

        if (history >= 2) {
          harker.speaking = true;
          harker.emit('speaking');
        }
      } else if (currentVolume < threshold && harker.speaking) {
        for (var i = 0; i < harker.speakingHistory.length; i++) {
          history += harker.speakingHistory[i];
        }

        if (history == 0) {
          harker.speaking = false;
          harker.emit('stopped_speaking');
        }
      }

      harker.speakingHistory.shift();
      harker.speakingHistory.push(0 + (currentVolume > threshold));
      looper();
    }, interval);
  };

  looper();
  return harker;
};

},{"wildemitter":31}],10:[function(require,module,exports){
"use strict";

if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor;
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor;

    var TempCtor = function TempCtor() {};

    TempCtor.prototype = superCtor.prototype;
    ctor.prototype = new TempCtor();
    ctor.prototype.constructor = ctor;
  };
}

},{}],11:[function(require,module,exports){
"use strict";

var methods = "assert,count,debug,dir,dirxml,error,exception,group,groupCollapsed,groupEnd,info,log,markTimeline,profile,profileEnd,time,timeEnd,trace,warn".split(",");
var l = methods.length;

var fn = function fn() {};

var mockconsole = {};

while (l--) {
  mockconsole[methods[l]] = fn;
}

module.exports = mockconsole;

},{}],12:[function(require,module,exports){
"use strict";

// shim for using process in browser
var process = module.exports = {}; // cached from whatever global is present so that test runners that stub it
// don't break things.  But we need to wrap it in a try catch in case it is
// wrapped in strict mode code which doesn't define any globals.  It's inside a
// function because try/catches deoptimize in certain engines.

var cachedSetTimeout;
var cachedClearTimeout;

function defaultSetTimout() {
  throw new Error('setTimeout has not been defined');
}

function defaultClearTimeout() {
  throw new Error('clearTimeout has not been defined');
}

(function () {
  try {
    if (typeof setTimeout === 'function') {
      cachedSetTimeout = setTimeout;
    } else {
      cachedSetTimeout = defaultSetTimout;
    }
  } catch (e) {
    cachedSetTimeout = defaultSetTimout;
  }

  try {
    if (typeof clearTimeout === 'function') {
      cachedClearTimeout = clearTimeout;
    } else {
      cachedClearTimeout = defaultClearTimeout;
    }
  } catch (e) {
    cachedClearTimeout = defaultClearTimeout;
  }
})();

function runTimeout(fun) {
  if (cachedSetTimeout === setTimeout) {
    //normal enviroments in sane situations
    return setTimeout(fun, 0);
  } // if setTimeout wasn't available but was latter defined


  if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
    cachedSetTimeout = setTimeout;
    return setTimeout(fun, 0);
  }

  try {
    // when when somebody has screwed with setTimeout but no I.E. maddness
    return cachedSetTimeout(fun, 0);
  } catch (e) {
    try {
      // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
      return cachedSetTimeout.call(null, fun, 0);
    } catch (e) {
      // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
      return cachedSetTimeout.call(this, fun, 0);
    }
  }
}

function runClearTimeout(marker) {
  if (cachedClearTimeout === clearTimeout) {
    //normal enviroments in sane situations
    return clearTimeout(marker);
  } // if clearTimeout wasn't available but was latter defined


  if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
    cachedClearTimeout = clearTimeout;
    return clearTimeout(marker);
  }

  try {
    // when when somebody has screwed with setTimeout but no I.E. maddness
    return cachedClearTimeout(marker);
  } catch (e) {
    try {
      // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
      return cachedClearTimeout.call(null, marker);
    } catch (e) {
      // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
      // Some versions of I.E. have different rules for clearTimeout vs setTimeout
      return cachedClearTimeout.call(this, marker);
    }
  }
}

var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
  if (!draining || !currentQueue) {
    return;
  }

  draining = false;

  if (currentQueue.length) {
    queue = currentQueue.concat(queue);
  } else {
    queueIndex = -1;
  }

  if (queue.length) {
    drainQueue();
  }
}

function drainQueue() {
  if (draining) {
    return;
  }

  var timeout = runTimeout(cleanUpNextTick);
  draining = true;
  var len = queue.length;

  while (len) {
    currentQueue = queue;
    queue = [];

    while (++queueIndex < len) {
      if (currentQueue) {
        currentQueue[queueIndex].run();
      }
    }

    queueIndex = -1;
    len = queue.length;
  }

  currentQueue = null;
  draining = false;
  runClearTimeout(timeout);
}

process.nextTick = function (fun) {
  var args = new Array(arguments.length - 1);

  if (arguments.length > 1) {
    for (var i = 1; i < arguments.length; i++) {
      args[i - 1] = arguments[i];
    }
  }

  queue.push(new Item(fun, args));

  if (queue.length === 1 && !draining) {
    runTimeout(drainQueue);
  }
}; // v8 likes predictible objects


function Item(fun, array) {
  this.fun = fun;
  this.array = array;
}

Item.prototype.run = function () {
  this.fun.apply(null, this.array);
};

process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues

process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;
process.prependListener = noop;
process.prependOnceListener = noop;

process.listeners = function (name) {
  return [];
};

process.binding = function (name) {
  throw new Error('process.binding is not supported');
};

process.cwd = function () {
  return '/';
};

process.chdir = function (dir) {
  throw new Error('process.chdir is not supported');
};

process.umask = function () {
  return 0;
};

},{}],13:[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 findCodecByPayloadType(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 rtxCapabilityMatches(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 RTCPeerConnection(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 get() {
      return this._localDescription;
    }
  });
  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {
    configurable: true,
    get: function get() {
      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 get() {
                    return remoteMsid.stream;
                  }
                });
              }

              Object.defineProperty(track, 'id', {
                get: function get() {
                  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":14}],14:[function(require,module,exports){
/* eslint-env node */
'use strict'; // SDP helpers.

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

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]
    };
  }
}; // 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 === "undefined" ? "undefined" : _typeof(module)) === 'object') {
  module.exports = SDPUtils;
}

},{}],15:[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';

var _adapter_factory = require("./adapter_factory.js");

var adapter = (0, _adapter_factory.adapterFactory)({
  window: window
});
module.exports = adapter; // this is the difference from adapter_core.

},{"./adapter_factory.js":16}],16:[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 _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
      window = _ref.window;

  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);
      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;
}

},{"./chrome/chrome_shim":17,"./common_shim":20,"./edge/edge_shim":21,"./firefox/firefox_shim":25,"./safari/safari_shim":28,"./utils":29}],17:[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 get() {
    return _getusermedia.shimGetUserMedia;
  }
});
Object.defineProperty(exports, "shimGetDisplayMedia", {
  enumerable: true,
  get: function get() {
    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 _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(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 get() {
        return this._ontrack;
      },
      set: function set(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 () {
      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 shimSenderWithDtmf(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 () {
        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 (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 (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 (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 (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 () {
      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 get() {
        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 (selector, successCallback, errorCallback) {
    var _this5 = this;

    var args = 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 arguments[0] !== 'function')) {
      return origGetStats.apply(this, []);
    }

    var fixChromeStats_ = function fixChromeStats_(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 makeMapStats(stats) {
      return new Map(Object.keys(stats).map(function (key) {
        return [key, stats[key]];
      }));
    };

    if (arguments.length >= 2) {
      var successCallbackWrapper_ = function successCallbackWrapper_(response) {
        args[1](makeMapStats(fixChromeStats_(response)));
      };

      return origGetStats.apply(this, [successCallbackWrapper_, arguments[0]]);
    } // promise-support


    return new Promise(function (resolve, reject) {
      origGetStats.apply(_this5, [function (response) {
        resolve(makeMapStats(fixChromeStats_(response)));
      }, reject]);
    }).then(successCallback, errorCallback);
  };
}

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 () {
        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 () {
        var sender = origAddTrack.apply(this, arguments);
        sender._pc = this;
        return sender;
      };
    }

    window.RTCRtpSender.prototype.getStats = function () {
      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 () {
        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 () {
      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 () {
    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 () {
    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 (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 (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 (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 (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 () {
    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 (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 (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 (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];

    window.RTCPeerConnection.prototype[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);
      });
    };
  });
  var origSetLocalDescription = window.RTCPeerConnection.prototype.setLocalDescription;

  window.RTCPeerConnection.prototype.setLocalDescription = function () {
    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 get() {
      var description = origLocalDescription.get.apply(this);

      if (description.type === '') {
        return description;
      }

      return replaceInternalStreamId(this, description);
    }
  });

  window.RTCPeerConnection.prototype.removeTrack = function (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) {
  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


  ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
    var nativeMethod = window.RTCPeerConnection.prototype[method];

    window.RTCPeerConnection.prototype[method] = function () {
      arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
      return nativeMethod.apply(this, arguments);
    };
  }); // support for addIceCandidate(null or undefined)

  var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;

  window.RTCPeerConnection.prototype.addIceCandidate = function () {
    if (!arguments[0]) {
      if (arguments[1]) {
        arguments[1].apply(null);
      }

      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":29,"./getdisplaymedia":18,"./getusermedia":19}],18:[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 (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);
    });
  };
}

},{}],19:[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 _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(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 constraintsToChrome_(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 oldname_(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 shimConstraints_(constraints, func) {
    if (browserDetails.version >= 61) {
      return func(constraints);
    }

    constraints = JSON.parse(JSON.stringify(constraints));

    if (constraints && _typeof(constraints.audio) === 'object') {
      var remap = function remap(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 shimError_(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 toString() {
        return this.name + (this.message && ': ') + this.message;
      }
    };
  };

  var getUserMedia_ = function getUserMedia_(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":29}],20:[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 _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(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 (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 () {
        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.RTCSctpTransport || !window.RTCPeerConnection) {
    return;
  }

  var browserDetails = utils.detectBrowser(window);

  if (!('sctp' in window.RTCPeerConnection.prototype)) {
    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {
      get: function get() {
        return typeof this._sctp === 'undefined' ? null : this._sctp;
      }
    });
  }

  var sctpInDescription = function sctpInDescription(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 getRemoteFirefoxVersion(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 getCanSendMaxMessageSize(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 getMaxMessageSize(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 () {
    this._sctp = null;

    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 get() {
          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 () {
      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 () {
    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 get() {
      return {
        completed: 'connected',
        checking: 'connecting'
      }[this.iceConnectionState] || this.iceConnectionState;
    },
    enumerable: true,
    configurable: true
  });
  Object.defineProperty(proto, 'onconnectionstatechange', {
    get: function get() {
      return this._onconnectionstatechange || null;
    },
    set: function set(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 (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);
  };
}

},{"./utils":29,"sdp":14}],21:[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 get() {
    return _getusermedia.shimGetUserMedia;
  }
});
Object.defineProperty(exports, "shimGetDisplayMedia", {
  enumerable: true,
  get: function get() {
    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 (args) {
        return args;
      };
    }

    if (!window.RTCSessionDescription) {
      window.RTCSessionDescription = function (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 set(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 get() {
        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 (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":29,"./filtericeservers":22,"./getdisplaymedia":23,"./getusermedia":24,"rtcpeerconnection-shim":13}],22:[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":29}],23:[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);
}

},{}],24:[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 shimError_(e) {
    return {
      name: {
        PermissionDeniedError: 'NotAllowedError'
      }[e.name] || e.name,
      message: e.message,
      constraint: e.constraint,
      toString: function toString() {
        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));
    });
  };
}

},{}],25:[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;
Object.defineProperty(exports, "shimGetUserMedia", {
  enumerable: true,
  get: function get() {
    return _getusermedia.shimGetUserMedia;
  }
});
Object.defineProperty(exports, "shimGetDisplayMedia", {
  enumerable: true,
  get: function get() {
    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 _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(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 get() {
        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;
  } // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.


  ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
    var nativeMethod = window.RTCPeerConnection.prototype[method];

    window.RTCPeerConnection.prototype[method] = function () {
      arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
      return nativeMethod.apply(this, arguments);
    };
  }); // support for addIceCandidate(null or undefined)

  var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;

  window.RTCPeerConnection.prototype.addIceCandidate = function () {
    if (!arguments[0]) {
      if (arguments[1]) {
        arguments[1].apply(null);
      }

      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 (selector, onSucc, onErr) {
    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 () {
      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 () {
      var sender = origAddTrack.apply(this, arguments);
      sender._pc = this;
      return sender;
    };
  }

  window.RTCRtpSender.prototype.getStats = function () {
    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 () {
      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 () {
    return this._pc.getStats(this.track);
  };
}

function shimRemoveStream(window) {
  if (!window.RTCPeerConnection || 'removeStream' in window.RTCPeerConnection.prototype) {
    return;
  }

  window.RTCPeerConnection.prototype.removeStream = function (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;
  }
}

},{"../utils":29,"./getdisplaymedia":26,"./getusermedia":27}],26:[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 (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);
  };
}

},{}],27:[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 _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(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 remap(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":29}],28:[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 _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(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 () {
      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 (stream) {
      var _this = this;

      if (!this._localStreams) {
        this._localStreams = [];
      }

      if (!this._localStreams.includes(stream)) {
        this._localStreams.push(stream);
      }

      stream.getTracks().forEach(function (track) {
        return _addTrack.call(_this, track, stream);
      });
    };

    window.RTCPeerConnection.prototype.addTrack = function (track, stream) {
      if (stream) {
        if (!this._localStreams) {
          this._localStreams = [stream];
        } else if (!this._localStreams.includes(stream)) {
          this._localStreams.push(stream);
        }
      }

      return _addTrack.call(this, track, stream);
    };
  }

  if (!('removeStream' in window.RTCPeerConnection.prototype)) {
    window.RTCPeerConnection.prototype.removeStream = function (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 () {
      return this._remoteStreams ? this._remoteStreams : [];
    };
  }

  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {
    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {
      get: function get() {
        return this._onaddstream;
      },
      set: function set(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 () {
      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 createOffer = prototype.createOffer;
  var createAnswer = prototype.createAnswer;
  var setLocalDescription = prototype.setLocalDescription;
  var setRemoteDescription = prototype.setRemoteDescription;
  var addIceCandidate = prototype.addIceCandidate;

  prototype.createOffer = function (successCallback, failureCallback) {
    var options = arguments.length >= 2 ? arguments[2] : arguments[0];
    var promise = createOffer.apply(this, [options]);

    if (!failureCallback) {
      return promise;
    }

    promise.then(successCallback, failureCallback);
    return Promise.resolve();
  };

  prototype.createAnswer = function (successCallback, failureCallback) {
    var options = arguments.length >= 2 ? arguments[2] : arguments[0];
    var promise = createAnswer.apply(this, [options]);

    if (!failureCallback) {
      return promise;
    }

    promise.then(successCallback, failureCallback);
    return Promise.resolve();
  };

  var withCallback = function withCallback(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 withCallback(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 withCallback(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 (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 (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 get() {
        return OrigPeerConnection.generateCertificate;
      }
    });
  }
}

function shimTrackEventTransceiver(window) {
  // Add event.transceiver member over deprecated event.receiver
  if (_typeof(window) === 'object' && window.RTCPeerConnection && 'receiver' in window.RTCTrackEvent.prototype && // can't check 'transceiver' in window.RTCTrackEvent.prototype, as it is
  // defined for some reason even when window.RTCTransceiver is not.
  !window.RTCTransceiver) {
    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
      get: function get() {
        return {
          receiver: this.receiver
        };
      }
    });
  }
}

function shimCreateOfferLegacy(window) {
  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;

  window.RTCPeerConnection.prototype.createOffer = function (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":29}],29:[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 _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(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 wrappedCallback(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 get() {
      return this['_on' + eventNameToWrap];
    },
    set: function set(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 = window.navigator; // 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);
  } else {
    // Default fallthrough: not supported.
    result.browser = 'Not a supported browser.';
    return result;
  }

  return result;
}
/**
 * Remove all empty objects and undefined values
 * from a nested object -- an enhanced and vanilla version
 * of Lodash's `compact`.
 */


function compactObject(data) {
  if (_typeof(data) !== 'object') {
    return data;
  }

  return Object.keys(data).reduce(function (accumulator, key) {
    var isObject = _typeof(data[key]) === 'object';
    var value = isObject ? compactObject(data[key]) : data[key];
    var isEmptyObject = isObject && !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;
}

},{}],30:[function(require,module,exports){
"use strict";

// created by @HenrikJoreteg
var prefix;
var version;

if (window.mozRTCPeerConnection || navigator.mozGetUserMedia) {
  prefix = 'moz';
  version = parseInt(navigator.userAgent.match(/Firefox\/([0-9]+)\./)[1], 10);
} else if (window.webkitRTCPeerConnection || navigator.webkitGetUserMedia) {
  prefix = 'webkit';
  version = navigator.userAgent.match(/Chrom(e|ium)/) && parseInt(navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./)[2], 10);
}

var PC = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
var IceCandidate = window.mozRTCIceCandidate || window.RTCIceCandidate;
var SessionDescription = window.mozRTCSessionDescription || window.RTCSessionDescription;
var MediaStream = window.webkitMediaStream || window.MediaStream;
var screenSharing = window.location.protocol === 'https:' && (prefix === 'webkit' && version >= 26 || prefix === 'moz' && version >= 33);
var AudioContext = window.AudioContext || window.webkitAudioContext;
var videoEl = document.createElement('video');
var supportVp8 = videoEl && videoEl.canPlayType && videoEl.canPlayType('video/webm; codecs="vp8", vorbis') === "probably";
var getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.msGetUserMedia || navigator.mozGetUserMedia; // export support flags and constructors.prototype && PC

module.exports = {
  prefix: prefix,
  browserVersion: version,
  support: !!PC && !!getUserMedia,
  // new support style
  supportRTCPeerConnection: !!PC,
  supportVp8: supportVp8,
  supportGetUserMedia: !!getUserMedia,
  supportDataChannel: !!(PC && PC.prototype && PC.prototype.createDataChannel),
  supportWebAudio: !!(AudioContext && AudioContext.prototype.createMediaStreamSource),
  supportMediaStream: !!(MediaStream && MediaStream.prototype.removeTrack),
  supportScreenSharing: !!screenSharing,
  // constructors
  AudioContext: AudioContext,
  PeerConnection: PC,
  SessionDescription: SessionDescription,
  IceCandidate: IceCandidate,
  MediaStream: MediaStream,
  getUserMedia: getUserMedia
};

},{}],31:[function(require,module,exports){
"use strict";

/*
WildEmitter.js is a slim little event emitter by @henrikjoreteg largely based
on @visionmedia's Emitter from UI Kit.

Why? I wanted it standalone.

I also wanted support for wildcard emitters like this:

emitter.on('*', function (eventName, other, event, payloads) {

});

emitter.on('somenamespace*', function (eventName, payloads) {

});

Please note that callbacks triggered by wildcard registered events also get
the event name as the first argument.
*/
module.exports = WildEmitter;

function WildEmitter() {}

WildEmitter.mixin = function (constructor) {
  var prototype = constructor.prototype || constructor;
  prototype.isWildEmitter = true; // Listen on the given `event` with `fn`. Store a group name if present.

  prototype.on = function (event, groupName, fn) {
    this.callbacks = this.callbacks || {};
    var hasGroup = arguments.length === 3,
        group = hasGroup ? arguments[1] : undefined,
        func = hasGroup ? arguments[2] : arguments[1];
    func._groupName = group;
    (this.callbacks[event] = this.callbacks[event] || []).push(func);
    return this;
  }; // Adds an `event` listener that will be invoked a single
  // time then automatically removed.


  prototype.once = function (event, groupName, fn) {
    var self = this,
        hasGroup = arguments.length === 3,
        group = hasGroup ? arguments[1] : undefined,
        func = hasGroup ? arguments[2] : arguments[1];

    function on() {
      self.off(event, on);
      func.apply(this, arguments);
    }

    this.on(event, group, on);
    return this;
  }; // Unbinds an entire group


  prototype.releaseGroup = function (groupName) {
    this.callbacks = this.callbacks || {};
    var item, i, len, handlers;

    for (item in this.callbacks) {
      handlers = this.callbacks[item];

      for (i = 0, len = handlers.length; i < len; i++) {
        if (handlers[i]._groupName === groupName) {
          //console.log('removing');
          // remove it and shorten the array we're looping through
          handlers.splice(i, 1);
          i--;
          len--;
        }
      }
    }

    return this;
  }; // Remove the given callback for `event` or all
  // registered callbacks.


  prototype.off = function (event, fn) {
    this.callbacks = this.callbacks || {};
    var callbacks = this.callbacks[event],
        i;
    if (!callbacks) return this; // remove all handlers

    if (arguments.length === 1) {
      delete this.callbacks[event];
      return this;
    } // remove specific handler


    i = callbacks.indexOf(fn);
    callbacks.splice(i, 1);

    if (callbacks.length === 0) {
      delete this.callbacks[event];
    }

    return this;
  }; /// Emit `event` with the given args.
  // also calls any `*` handlers


  prototype.emit = function (event) {
    this.callbacks = this.callbacks || {};
    var args = [].slice.call(arguments, 1),
        callbacks = this.callbacks[event],
        specialCallbacks = this.getWildcardCallbacks(event),
        i,
        len,
        item,
        listeners;

    if (callbacks) {
      listeners = callbacks.slice();

      for (i = 0, len = listeners.length; i < len; ++i) {
        if (!listeners[i]) {
          break;
        }

        listeners[i].apply(this, args);
      }
    }

    if (specialCallbacks) {
      len = specialCallbacks.length;
      listeners = specialCallbacks.slice();

      for (i = 0, len = listeners.length; i < len; ++i) {
        if (!listeners[i]) {
          break;
        }

        listeners[i].apply(this, [event].concat(args));
      }
    }

    return this;
  }; // Helper for for finding special wildcard event handlers that match the event


  prototype.getWildcardCallbacks = function (eventName) {
    this.callbacks = this.callbacks || {};
    var item,
        split,
        result = [];

    for (item in this.callbacks) {
      split = item.split('*');

      if (item === '*' || split.length === 2 && eventName.slice(0, split[0].length) === split[0]) {
        result = result.concat(this.callbacks[item]);
      }
    }

    return result;
  };
};

WildEmitter.mixin(WildEmitter);

},{}]},{},[4])(4)
});
