traceablepeerconnection.bundle.js

(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.PeerConnection = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
// based on https://github.com/ESTOS/strophe.jingle/
// adds wildemitter support
var util = require('util');
var adapter = require('webrtc-adapter'); // jshint ignore:line
var WildEmitter = require('wildemitter');

function dumpSDP(description) {
    return {
        type: description.type,
        sdp: description.sdp
    };
}

function dumpStream(stream) {
    var info = {
        label: stream.id,
    };
    if (stream.getAudioTracks().length) {
        info.audio = stream.getAudioTracks().map(function (track) {
            return track.id;
        });
    }
    if (stream.getVideoTracks().length) {
        info.video = stream.getVideoTracks().map(function (track) {
            return track.id;
        });
    }
    return info;
}

function TraceablePeerConnection(config, constraints) {
    var self = this;
    WildEmitter.call(this);

    this.peerconnection = new window.RTCPeerConnection(config, constraints);

    this.trace = function (what, info) {
        self.emit('PeerConnectionTrace', {
            time: new Date(),
            type: what,
            value: info || ""
        });
    };

    this.onicecandidate = null;
    this.peerconnection.onicecandidate = function (event) {
        self.trace('onicecandidate', event.candidate);
        if (self.onicecandidate !== null) {
            self.onicecandidate(event);
        }
    };
    this.onaddstream = null;
    this.peerconnection.onaddstream = function (event) {
        self.trace('onaddstream', dumpStream(event.stream));
        if (self.onaddstream !== null) {
            self.onaddstream(event);
        }
    };
    this.onremovestream = null;
    this.peerconnection.onremovestream = function (event) {
        self.trace('onremovestream', dumpStream(event.stream));
        if (self.onremovestream !== null) {
            self.onremovestream(event);
        }
    };
    this.onsignalingstatechange = null;
    this.peerconnection.onsignalingstatechange = function (event) {
        self.trace('onsignalingstatechange', self.signalingState);
        if (self.onsignalingstatechange !== null) {
            self.onsignalingstatechange(event);
        }
    };
    this.oniceconnectionstatechange = null;
    this.peerconnection.oniceconnectionstatechange = function (event) {
        self.trace('oniceconnectionstatechange', self.iceConnectionState);
        if (self.oniceconnectionstatechange !== null) {
            self.oniceconnectionstatechange(event);
        }
    };
    this.onnegotiationneeded = null;
    this.peerconnection.onnegotiationneeded = function (event) {
        self.trace('onnegotiationneeded');
        if (self.onnegotiationneeded !== null) {
            self.onnegotiationneeded(event);
        }
    };
    self.ondatachannel = null;
    this.peerconnection.ondatachannel = function (event) {
        self.trace('ondatachannel', event);
        if (self.ondatachannel !== null) {
            self.ondatachannel(event);
        }
    };
    this.getLocalStreams = this.peerconnection.getLocalStreams.bind(this.peerconnection);
    this.getRemoteStreams = this.peerconnection.getRemoteStreams.bind(this.peerconnection);
}

util.inherits(TraceablePeerConnection, WildEmitter);

['signalingState', 'iceConnectionState', 'localDescription', 'remoteDescription'].forEach(function (prop) {
    Object.defineProperty(TraceablePeerConnection.prototype, prop, {
        get: function () {
            return this.peerconnection[prop];
        }
    });
});

TraceablePeerConnection.prototype.addStream = function (stream) {
    this.trace('addStream', dumpStream(stream));
    this.peerconnection.addStream(stream);
};

TraceablePeerConnection.prototype.removeStream = function (stream) {
    this.trace('removeStream', dumpStream(stream));
    this.peerconnection.removeStream(stream);
};

TraceablePeerConnection.prototype.createDataChannel = function (label, opts) {
    this.trace('createDataChannel', label, opts);
    return this.peerconnection.createDataChannel(label, opts);
};

TraceablePeerConnection.prototype.setLocalDescription = function (description, successCallback, failureCallback) {
    var self = this;
    this.trace('setLocalDescription', dumpSDP(description));
    return this.peerconnection.setLocalDescription(
        description
    ).then(
        function () {
            self.trace('setLocalDescriptionOnSuccess');
            if (successCallback) successCallback();
        },
        function (err) {
            self.trace('setLocalDescriptionOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.setRemoteDescription = function (description, successCallback, failureCallback) {
    var self = this;
    this.trace('setRemoteDescription', dumpSDP(description));
    return this.peerconnection.setRemoteDescription(
        description
    ).then(
        function () {
            self.trace('setRemoteDescriptionOnSuccess');
            if (successCallback) successCallback();
        },
        function (err) {
            self.trace('setRemoteDescriptionOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.close = function () {
    this.trace('stop');
    if (this.peerconnection.signalingState != 'closed') {
        this.peerconnection.close();
    }
};

TraceablePeerConnection.prototype.createOffer = function (successCallback, failureCallback, constraints) {
    var self = this;
    this.trace('createOffer', constraints);
    return this.peerconnection.createOffer(
        constraints
    ).then(
        function (offer) {
            self.trace('createOfferOnSuccess', dumpSDP(offer));
            if (successCallback) successCallback(offer);
        },
        function (err) {
            self.trace('createOfferOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.createAnswer = function (successCallback, failureCallback, constraints) {
    var self = this;
    this.trace('createAnswer', constraints);
    return this.peerconnection.createAnswer(
        constraints
    ).then(
        function (answer) {
            self.trace('createAnswerOnSuccess', dumpSDP(answer));
            if (successCallback) successCallback(answer);
        },
        function (err) {
            self.trace('createAnswerOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.addIceCandidate = function (candidate, successCallback, failureCallback) {
    var self = this;
    this.trace('addIceCandidate', candidate);
    return this.peerconnection.addIceCandidate(
        candidate
    ).then(
        function () {
            //self.trace('addIceCandidateOnSuccess');
            if (successCallback) successCallback();
        },
        function (err) {
            self.trace('addIceCandidateOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.getStats = function () {
    this.peerconnection.getStats.apply(this.peerconnection, arguments);
};

module.exports = TraceablePeerConnection;

},{"util":6,"webrtc-adapter":7,"wildemitter":16}],2:[function(require,module,exports){
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.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],3:[function(require,module,exports){
// 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 () {
    try {
        cachedSetTimeout = setTimeout;
    } catch (e) {
        cachedSetTimeout = function () {
            throw new Error('setTimeout is not defined');
        }
    }
    try {
        cachedClearTimeout = clearTimeout;
    } catch (e) {
        cachedClearTimeout = function () {
            throw new Error('clearTimeout is not defined');
        }
    }
} ())
function runTimeout(fun) {
    if (cachedSetTimeout === setTimeout) {
        //normal enviroments in sane situations
        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);
    }
    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.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; };

},{}],4:[function(require,module,exports){
 /* eslint-env node */
'use strict';

// SDP helpers.
var SDPUtils = {};

// Generate an alphanumeric identifier for cname or mids.
// TODO: use UUIDs instead? https://gist.github.com/jed/982883
SDPUtils.generateIdentifier = function() {
  return Math.random().toString(36).substr(2, 10);
};

// The RTCP CNAME used by all peerconnections from the same JS.
SDPUtils.localCName = SDPUtils.generateIdentifier();

// Splits SDP into lines, dealing with both CRLF and LF.
SDPUtils.splitLines = function(blob) {
  return blob.trim().split('\n').map(function(line) {
    return line.trim();
  });
};
// Splits SDP into sessionpart and mediasections. Ensures CRLF.
SDPUtils.splitSections = function(blob) {
  var parts = blob.split('\nm=');
  return parts.map(function(part, index) {
    return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
  });
};

// Returns 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: parts[1],
    protocol: parts[2].toLowerCase(),
    priority: parseInt(parts[3], 10),
    ip: parts[4],
    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;
      default: // Unknown extensions are silently ignored.
        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.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); // was: relAddr
    sdp.push('rport');
    sdp.push(candidate.relatedPort); // was: relPort
  }
  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {
    sdp.push('tcptype');
    sdp.push(candidate.tcpType);
  }
  return 'candidate:' + sdp.join(' ');
};

// 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
  // was: channels
  parsed.numChannels = parts.length === 3 ? parseInt(parts[2], 10) : 1;
  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;
  }
  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +
      (codec.numChannels !== 1 ? '/' + codec.numChannels : '') + '\r\n';
};

// Parses an a=extmap line (headerextension from RFC 5285). Sample input:
// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
SDPUtils.parseExtmap = function(line) {
  var parts = line.substr(9).split(' ');
  return {
    id: parseInt(parts[0], 10),
    uri: parts[1]
  };
};

// Generates a=extmap line from RTCRtpHeaderExtensionParameters or
// RTCRtpHeaderExtension.
SDPUtils.writeExtmap = function(headerExtension) {
  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +
       ' ' + 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) {
      params.push(param + '=' + codec.parameters[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;
};

// 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.splitLines(mediaSection);
  // Search in session part, too.
  lines = lines.concat(SDPUtils.splitLines(sessionpart));
  var fpLine = lines.filter(function(line) {
    return line.indexOf('a=fingerprint:') === 0;
  })[0].substr(14);
  // Note: a=setup line is ignored since we use the 'auto' role.
  var dtlsParameters = {
    role: 'auto',
    fingerprints: [{
      algorithm: fpLine.split(' ')[0],
      value: fpLine.split(' ')[1]
    }]
  };
  return dtlsParameters;
};

// 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);
  });
  // FIXME: add headerExtensions, fecMechanismş and rtcp.
  sdp += 'a=rtcp-mux\r\n';
  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.split(' ');
    parts.shift();
    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),
        rtx: {
          payloadType: codec.payloadType,
          ssrc: secondarySsrc
        }
      };
      encodingParameters.push(encParam);
      if (hasRed) {
        encParam = JSON.parse(JSON.stringify(encParam));
        encParam.fec = {
          ssrc: secondarySsrc,
          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) {
      bandwidth = parseInt(bandwidth[0].substr(5), 10);
    }
    encodingParameters.forEach(function(params) {
      params.maxBitrate = bandwidth;
    });
  }
  return encodingParameters;
};

SDPUtils.writeSessionBoilerplate = function() {
  // FIXME: sess-id should be an NTP timestamp.
  return 'v=0\r\n' +
      'o=thisisadapterortc 8169639915646943137 2 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.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';
  }

  // FIXME: for RTX there might be multiple SSRCs. Not implemented in Edge yet.
  if (transceiver.rtpSender) {
    var msid = 'msid:' + stream.id + ' ' +
        transceiver.rtpSender.track.id + '\r\n';
    sdp += 'a=' + msid;
    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
        ' ' + msid;
  }
  // FIXME: this should be written by writeRtpDescription.
  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].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';
};

// Expose public methods.
module.exports = SDPUtils;

},{}],5:[function(require,module,exports){
module.exports = function isBuffer(arg) {
  return arg && typeof arg === 'object'
    && typeof arg.copy === 'function'
    && typeof arg.fill === 'function'
    && typeof arg.readUInt8 === 'function';
}
},{}],6:[function(require,module,exports){
(function (process,global){
// 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 '\u001b[' + inspect.colors[style][0] + 'm' + str +
           '\u001b[' + 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":5,"_process":3,"inherits":2}],7:[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';

// Shimming starts here.
(function() {
  // Utils.
  var logging = require('./utils').log;
  var browserDetails = require('./utils').browserDetails;
  // Export to the adapter global object visible in the browser.
  module.exports.browserDetails = browserDetails;
  module.exports.extractVersion = require('./utils').extractVersion;
  module.exports.disableLog = require('./utils').disableLog;

  // Uncomment the line below if you want logging to occur, including logging
  // for the switch statement below. Can also be turned on in the browser via
  // adapter.disableLog(false), but then logging from the switch statement below
  // will not appear.
  // require('./utils').disableLog(false);

  // Browser shims.
  var chromeShim = require('./chrome/chrome_shim') || null;
  var edgeShim = require('./edge/edge_shim') || null;
  var firefoxShim = require('./firefox/firefox_shim') || null;
  var safariShim = require('./safari/safari_shim') || null;

  // Shim browser if found.
  switch (browserDetails.browser) {
    case 'opera': // fallthrough as it uses chrome shims
    case 'chrome':
      if (!chromeShim || !chromeShim.shimPeerConnection) {
        logging('Chrome shim is not included in this adapter release.');
        return;
      }
      logging('adapter.js shimming chrome.');
      // Export to the adapter global object visible in the browser.
      module.exports.browserShim = chromeShim;

      chromeShim.shimGetUserMedia();
      chromeShim.shimMediaStream();
      chromeShim.shimSourceObject();
      chromeShim.shimPeerConnection();
      chromeShim.shimOnTrack();
      break;
    case 'firefox':
      if (!firefoxShim || !firefoxShim.shimPeerConnection) {
        logging('Firefox shim is not included in this adapter release.');
        return;
      }
      logging('adapter.js shimming firefox.');
      // Export to the adapter global object visible in the browser.
      module.exports.browserShim = firefoxShim;

      firefoxShim.shimGetUserMedia();
      firefoxShim.shimSourceObject();
      firefoxShim.shimPeerConnection();
      firefoxShim.shimOnTrack();
      break;
    case 'edge':
      if (!edgeShim || !edgeShim.shimPeerConnection) {
        logging('MS edge shim is not included in this adapter release.');
        return;
      }
      logging('adapter.js shimming edge.');
      // Export to the adapter global object visible in the browser.
      module.exports.browserShim = edgeShim;

      edgeShim.shimGetUserMedia();
      edgeShim.shimPeerConnection();
      break;
    case 'safari':
      if (!safariShim) {
        logging('Safari shim is not included in this adapter release.');
        return;
      }
      logging('adapter.js shimming safari.');
      // Export to the adapter global object visible in the browser.
      module.exports.browserShim = safariShim;

      safariShim.shimGetUserMedia();
      break;
    default:
      logging('Unsupported browser!');
  }
})();

},{"./chrome/chrome_shim":8,"./edge/edge_shim":10,"./firefox/firefox_shim":12,"./safari/safari_shim":14,"./utils":15}],8:[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 logging = require('../utils.js').log;
var browserDetails = require('../utils.js').browserDetails;

var chromeShim = {
  shimMediaStream: function() {
    window.MediaStream = window.MediaStream || window.webkitMediaStream;
  },

  shimOnTrack: function() {
    if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
        window.RTCPeerConnection.prototype)) {
      Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
        get: function() {
          return this._ontrack;
        },
        set: function(f) {
          var self = this;
          if (this._ontrack) {
            this.removeEventListener('track', this._ontrack);
            this.removeEventListener('addstream', this._ontrackpoly);
          }
          this.addEventListener('track', this._ontrack = f);
          this.addEventListener('addstream', 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 event = new Event('track');
              event.track = te.track;
              event.receiver = {track: te.track};
              event.streams = [e.stream];
              self.dispatchEvent(event);
            });
            e.stream.getTracks().forEach(function(track) {
              var event = new Event('track');
              event.track = track;
              event.receiver = {track: track};
              event.streams = [e.stream];
              this.dispatchEvent(event);
            }.bind(this));
          }.bind(this));
        }
      });
    }
  },

  shimSourceObject: function() {
    if (typeof window === 'object') {
      if (window.HTMLMediaElement &&
        !('srcObject' in window.HTMLMediaElement.prototype)) {
        // Shim the srcObject property, once, when HTMLMediaElement is found.
        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {
          get: function() {
            return this._srcObject;
          },
          set: function(stream) {
            var self = this;
            // Use _srcObject as a private property for this shim
            this._srcObject = stream;
            if (this.src) {
              URL.revokeObjectURL(this.src);
            }

            if (!stream) {
              this.src = '';
              return;
            }
            this.src = URL.createObjectURL(stream);
            // We need to recreate the blob url when a track is added or
            // removed. Doing it manually since we want to avoid a recursion.
            stream.addEventListener('addtrack', function() {
              if (self.src) {
                URL.revokeObjectURL(self.src);
              }
              self.src = URL.createObjectURL(stream);
            });
            stream.addEventListener('removetrack', function() {
              if (self.src) {
                URL.revokeObjectURL(self.src);
              }
              self.src = URL.createObjectURL(stream);
            });
          }
        });
      }
    }
  },

  shimPeerConnection: function() {
    // The RTCPeerConnection object.
    window.RTCPeerConnection = function(pcConfig, pcConstraints) {
      // Translate iceTransportPolicy to iceTransports,
      // see https://code.google.com/p/webrtc/issues/detail?id=4869
      logging('PeerConnection');
      if (pcConfig && pcConfig.iceTransportPolicy) {
        pcConfig.iceTransports = pcConfig.iceTransportPolicy;
      }

      var pc = new webkitRTCPeerConnection(pcConfig, pcConstraints);
      var origGetStats = pc.getStats.bind(pc);
      pc.getStats = function(selector, successCallback, errorCallback) {
        var self = 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(selector, successCallback);
        }

        var fixChromeStats_ = function(response) {
          var standardReport = {};
          var reports = response.result();
          reports.forEach(function(report) {
            var standardStats = {
              id: report.id,
              timestamp: report.timestamp,
              type: report.type
            };
            report.names().forEach(function(name) {
              standardStats[name] = report.stat(name);
            });
            standardReport[standardStats.id] = standardStats;
          });

          return standardReport;
        };

        // shim getStats with maplike support
        var makeMapStats = function(stats, legacyStats) {
          var map = new Map(Object.keys(stats).map(function(key) {
            return[key, stats[key]];
          }));
          legacyStats = legacyStats || stats;
          Object.keys(legacyStats).forEach(function(key) {
            map[key] = legacyStats[key];
          });
          return map;
        };

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

          return origGetStats.apply(this, [successCallbackWrapper_,
              arguments[0]]);
        }

        // promise-support
        return new Promise(function(resolve, reject) {
          if (args.length === 1 && typeof selector === 'object') {
            origGetStats.apply(self, [
              function(response) {
                resolve(makeMapStats(fixChromeStats_(response)));
              }, reject]);
          } else {
            // Preserve legacy chrome stats only on legacy access of stats obj
            origGetStats.apply(self, [
              function(response) {
                resolve(makeMapStats(fixChromeStats_(response),
                    response.result()));
              }, reject]);
          }
        }).then(successCallback, errorCallback);
      };

      return pc;
    };
    window.RTCPeerConnection.prototype = webkitRTCPeerConnection.prototype;

    // wrap static methods. Currently just generateCertificate.
    if (webkitRTCPeerConnection.generateCertificate) {
      Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
        get: function() {
          return webkitRTCPeerConnection.generateCertificate;
        }
      });
    }

    ['createOffer', 'createAnswer'].forEach(function(method) {
      var nativeMethod = webkitRTCPeerConnection.prototype[method];
      webkitRTCPeerConnection.prototype[method] = function() {
        var self = this;
        if (arguments.length < 1 || (arguments.length === 1 &&
            typeof arguments[0] === 'object')) {
          var opts = arguments.length === 1 ? arguments[0] : undefined;
          return new Promise(function(resolve, reject) {
            nativeMethod.apply(self, [resolve, reject, opts]);
          });
        }
        return nativeMethod.apply(this, arguments);
      };
    });

    // add promise support -- natively available in Chrome 51
    if (browserDetails.version < 51) {
      ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
          .forEach(function(method) {
            var nativeMethod = webkitRTCPeerConnection.prototype[method];
            webkitRTCPeerConnection.prototype[method] = function() {
              var args = arguments;
              var self = this;
              var promise = new Promise(function(resolve, reject) {
                nativeMethod.apply(self, [args[0], resolve, reject]);
              });
              if (args.length < 2) {
                return promise;
              }
              return promise.then(function() {
                args[1].apply(null, []);
              },
              function(err) {
                if (args.length >= 3) {
                  args[2].apply(null, [err]);
                }
              });
            };
          });
    }

    // shim implicit creation of RTCSessionDescription/RTCIceCandidate
    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
        .forEach(function(method) {
          var nativeMethod = webkitRTCPeerConnection.prototype[method];
          webkitRTCPeerConnection.prototype[method] = function() {
            arguments[0] = new ((method === 'addIceCandidate') ?
                RTCIceCandidate : RTCSessionDescription)(arguments[0]);
            return nativeMethod.apply(this, arguments);
          };
        });

    // support for addIceCandidate(null)
    var nativeAddIceCandidate =
        RTCPeerConnection.prototype.addIceCandidate;
    RTCPeerConnection.prototype.addIceCandidate = function() {
      return arguments[0] === null ? Promise.resolve()
          : nativeAddIceCandidate.apply(this, arguments);
    };
  }
};


// Expose public methods.
module.exports = {
  shimMediaStream: chromeShim.shimMediaStream,
  shimOnTrack: chromeShim.shimOnTrack,
  shimSourceObject: chromeShim.shimSourceObject,
  shimPeerConnection: chromeShim.shimPeerConnection,
  shimGetUserMedia: require('./getusermedia')
};

},{"../utils.js":15,"./getusermedia":9}],9:[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 logging = require('../utils.js').log;

// Expose public methods.
module.exports = function() {
  var constraintsToChrome_ = function(c) {
    if (typeof c !== 'object' || c.mandatory || c.optional) {
      return c;
    }
    var cc = {};
    Object.keys(c).forEach(function(key) {
      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
        return;
      }
      var r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};
      if (r.exact !== undefined && typeof r.exact === 'number') {
        r.min = r.max = r.exact;
      }
      var oldname_ = function(prefix, name) {
        if (prefix) {
          return prefix + name.charAt(0).toUpperCase() + name.slice(1);
        }
        return (name === 'deviceId') ? 'sourceId' : name;
      };
      if (r.ideal !== undefined) {
        cc.optional = cc.optional || [];
        var oc = {};
        if (typeof r.ideal === 'number') {
          oc[oldname_('min', key)] = r.ideal;
          cc.optional.push(oc);
          oc = {};
          oc[oldname_('max', key)] = r.ideal;
          cc.optional.push(oc);
        } else {
          oc[oldname_('', key)] = r.ideal;
          cc.optional.push(oc);
        }
      }
      if (r.exact !== undefined && typeof r.exact !== 'number') {
        cc.mandatory = cc.mandatory || {};
        cc.mandatory[oldname_('', key)] = r.exact;
      } else {
        ['min', 'max'].forEach(function(mix) {
          if (r[mix] !== undefined) {
            cc.mandatory = cc.mandatory || {};
            cc.mandatory[oldname_(mix, key)] = r[mix];
          }
        });
      }
    });
    if (c.advanced) {
      cc.optional = (cc.optional || []).concat(c.advanced);
    }
    return cc;
  };

  var shimConstraints_ = function(constraints, func) {
    constraints = JSON.parse(JSON.stringify(constraints));
    if (constraints && constraints.audio) {
      constraints.audio = constraintsToChrome_(constraints.audio);
    }
    if (constraints && typeof constraints.video === 'object') {
      // Shim facingMode for mobile, where it defaults to "user".
      var face = constraints.video.facingMode;
      face = face && ((typeof face === 'object') ? face : {ideal: face});

      if ((face && (face.exact === 'user' || face.exact === 'environment' ||
                    face.ideal === 'user' || face.ideal === 'environment')) &&
          !(navigator.mediaDevices.getSupportedConstraints &&
            navigator.mediaDevices.getSupportedConstraints().facingMode)) {
        delete constraints.video.facingMode;
        if (face.exact === 'environment' || face.ideal === 'environment') {
          // Look for "back" in label, or use last cam (typically back cam).
          return navigator.mediaDevices.enumerateDevices()
          .then(function(devices) {
            devices = devices.filter(function(d) {
              return d.kind === 'videoinput';
            });
            var back = devices.find(function(d) {
              return d.label.toLowerCase().indexOf('back') !== -1;
            }) || (devices.length && devices[devices.length - 1]);
            if (back) {
              constraints.video.deviceId = face.exact ? {exact: back.deviceId} :
                                                        {ideal: back.deviceId};
            }
            constraints.video = constraintsToChrome_(constraints.video);
            logging('chrome: ' + JSON.stringify(constraints));
            return func(constraints);
          });
        }
      }
      constraints.video = constraintsToChrome_(constraints.video);
    }
    logging('chrome: ' + JSON.stringify(constraints));
    return func(constraints);
  };

  var shimError_ = function(e) {
    return {
      name: {
        PermissionDeniedError: 'NotAllowedError',
        ConstraintNotSatisfiedError: 'OverconstrainedError'
      }[e.name] || e.name,
      message: e.message,
      constraint: e.constraintName,
      toString: function() {
        return this.name + (this.message && ': ') + this.message;
      }
    };
  };

  var getUserMedia_ = function(constraints, onSuccess, onError) {
    shimConstraints_(constraints, function(c) {
      navigator.webkitGetUserMedia(c, onSuccess, function(e) {
        onError(shimError_(e));
      });
    });
  };

  navigator.getUserMedia = getUserMedia_;

  // Returns the result of getUserMedia as a Promise.
  var getUserMediaPromise_ = function(constraints) {
    return new Promise(function(resolve, reject) {
      navigator.getUserMedia(constraints, resolve, reject);
    });
  };

  if (!navigator.mediaDevices) {
    navigator.mediaDevices = {
      getUserMedia: getUserMediaPromise_,
      enumerateDevices: function() {
        return new Promise(function(resolve) {
          var kinds = {audio: 'audioinput', video: 'videoinput'};
          return MediaStreamTrack.getSources(function(devices) {
            resolve(devices.map(function(device) {
              return {label: device.label,
                      kind: kinds[device.kind],
                      deviceId: device.id,
                      groupId: ''};
            }));
          });
        });
      }
    };
  }

  // A shim for getUserMedia method on the mediaDevices object.
  // TODO(KaptenJansson) remove once implemented in Chrome stable.
  if (!navigator.mediaDevices.getUserMedia) {
    navigator.mediaDevices.getUserMedia = function(constraints) {
      return getUserMediaPromise_(constraints);
    };
  } else {
    // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia
    // function which returns a Promise, it does not accept spec-style
    // constraints.
    var origGetUserMedia = navigator.mediaDevices.getUserMedia.
        bind(navigator.mediaDevices);
    navigator.mediaDevices.getUserMedia = function(cs) {
      return shimConstraints_(cs, function(c) {
        return origGetUserMedia(c).catch(function(e) {
          return Promise.reject(shimError_(e));
        });
      });
    };
  }

  // Dummy devicechange event methods.
  // TODO(KaptenJansson) remove once implemented in Chrome stable.
  if (typeof navigator.mediaDevices.addEventListener === 'undefined') {
    navigator.mediaDevices.addEventListener = function() {
      logging('Dummy mediaDevices.addEventListener called.');
    };
  }
  if (typeof navigator.mediaDevices.removeEventListener === 'undefined') {
    navigator.mediaDevices.removeEventListener = function() {
      logging('Dummy mediaDevices.removeEventListener called.');
    };
  }
};

},{"../utils.js":15}],10:[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 SDPUtils = require('sdp');
var browserDetails = require('../utils').browserDetails;

var edgeShim = {
  shimPeerConnection: function() {
    if (window.RTCIceGatherer) {
      // ORTC defines an RTCIceCandidate object but no constructor.
      // Not implemented in Edge.
      if (!window.RTCIceCandidate) {
        window.RTCIceCandidate = function(args) {
          return args;
        };
      }
      // ORTC does not have a session description object but
      // other browsers (i.e. Chrome) that will support both PC and ORTC
      // in the future might have this defined already.
      if (!window.RTCSessionDescription) {
        window.RTCSessionDescription = function(args) {
          return args;
        };
      }
    }

    window.RTCPeerConnection = function(config) {
      var self = this;

      var _eventTarget = document.createDocumentFragment();
      ['addEventListener', 'removeEventListener', 'dispatchEvent']
          .forEach(function(method) {
            self[method] = _eventTarget[method].bind(_eventTarget);
          });

      this.onicecandidate = null;
      this.onaddstream = null;
      this.ontrack = null;
      this.onremovestream = null;
      this.onsignalingstatechange = null;
      this.oniceconnectionstatechange = null;
      this.onnegotiationneeded = null;
      this.ondatachannel = null;

      this.localStreams = [];
      this.remoteStreams = [];
      this.getLocalStreams = function() {
        return self.localStreams;
      };
      this.getRemoteStreams = function() {
        return self.remoteStreams;
      };

      this.localDescription = new RTCSessionDescription({
        type: '',
        sdp: ''
      });
      this.remoteDescription = new RTCSessionDescription({
        type: '',
        sdp: ''
      });
      this.signalingState = 'stable';
      this.iceConnectionState = 'new';
      this.iceGatheringState = 'new';

      this.iceOptions = {
        gatherPolicy: 'all',
        iceServers: []
      };
      if (config && config.iceTransportPolicy) {
        switch (config.iceTransportPolicy) {
          case 'all':
          case 'relay':
            this.iceOptions.gatherPolicy = config.iceTransportPolicy;
            break;
          case 'none':
            // FIXME: remove once implementation and spec have added this.
            throw new TypeError('iceTransportPolicy "none" not supported');
          default:
            // don't set iceTransportPolicy.
            break;
        }
      }
      this.usingBundle = config && config.bundlePolicy === 'max-bundle';

      if (config && config.iceServers) {
        // Edge does not like
        // 1) stun:
        // 2) turn: that does not have all of turn:host:port?transport=udp
        // 3) turn: with ipv6 addresses
        var iceServers = JSON.parse(JSON.stringify(config.iceServers));
        this.iceOptions.iceServers = iceServers.filter(function(server) {
          if (server && server.urls) {
            var urls = server.urls;
            if (typeof urls === 'string') {
              urls = [urls];
            }
            urls = urls.filter(function(url) {
              return (url.indexOf('turn:') === 0 &&
                  url.indexOf('transport=udp') !== -1 &&
                  url.indexOf('turn:[') === -1) ||
                  (url.indexOf('stun:') === 0 &&
                    browserDetails.version >= 14393);
            })[0];
            return !!urls;
          }
          return false;
        });
      }

      // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...
      // everything that is needed to describe a SDP m-line.
      this.transceivers = [];

      // since the iceGatherer is currently created in createOffer but we
      // must not emit candidates until after setLocalDescription we buffer
      // them in this array.
      this._localIceCandidatesBuffer = [];
    };

    window.RTCPeerConnection.prototype._emitBufferedCandidates = function() {
      var self = this;
      var sections = SDPUtils.splitSections(self.localDescription.sdp);
      // FIXME: need to apply ice candidates in a way which is async but
      // in-order
      this._localIceCandidatesBuffer.forEach(function(event) {
        var end = !event.candidate || Object.keys(event.candidate).length === 0;
        if (end) {
          for (var j = 1; j < sections.length; j++) {
            if (sections[j].indexOf('\r\na=end-of-candidates\r\n') === -1) {
              sections[j] += 'a=end-of-candidates\r\n';
            }
          }
        } else if (event.candidate.candidate.indexOf('typ endOfCandidates')
            === -1) {
          sections[event.candidate.sdpMLineIndex + 1] +=
              'a=' + event.candidate.candidate + '\r\n';
        }
        self.localDescription.sdp = sections.join('');
        self.dispatchEvent(event);
        if (self.onicecandidate !== null) {
          self.onicecandidate(event);
        }
        if (!event.candidate && self.iceGatheringState !== 'complete') {
          var complete = self.transceivers.every(function(transceiver) {
            return transceiver.iceGatherer &&
                transceiver.iceGatherer.state === 'completed';
          });
          if (complete) {
            self.iceGatheringState = 'complete';
          }
        }
      });
      this._localIceCandidatesBuffer = [];
    };

    window.RTCPeerConnection.prototype.addStream = function(stream) {
      // Clone is necessary for local demos mostly, attaching directly
      // to two different senders does not work (build 10547).
      this.localStreams.push(stream.clone());
      this._maybeFireNegotiationNeeded();
    };

    window.RTCPeerConnection.prototype.removeStream = function(stream) {
      var idx = this.localStreams.indexOf(stream);
      if (idx > -1) {
        this.localStreams.splice(idx, 1);
        this._maybeFireNegotiationNeeded();
      }
    };

    window.RTCPeerConnection.prototype.getSenders = function() {
      return this.transceivers.filter(function(transceiver) {
        return !!transceiver.rtpSender;
      })
      .map(function(transceiver) {
        return transceiver.rtpSender;
      });
    };

    window.RTCPeerConnection.prototype.getReceivers = function() {
      return this.transceivers.filter(function(transceiver) {
        return !!transceiver.rtpReceiver;
      })
      .map(function(transceiver) {
        return transceiver.rtpReceiver;
      });
    };

    // Determines the intersection of local and remote capabilities.
    window.RTCPeerConnection.prototype._getCommonCapabilities =
        function(localCapabilities, remoteCapabilities) {
          var commonCapabilities = {
            codecs: [],
            headerExtensions: [],
            fecMechanisms: []
          };
          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 &&
                  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;
        };

    // Create ICE gatherer, ICE transport and DTLS transport.
    window.RTCPeerConnection.prototype._createIceAndDtlsTransports =
        function(mid, sdpMLineIndex) {
          var self = this;
          var iceGatherer = new RTCIceGatherer(self.iceOptions);
          var iceTransport = new RTCIceTransport(iceGatherer);
          iceGatherer.onlocalcandidate = function(evt) {
            var event = new Event('icecandidate');
            event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};

            var cand = evt.candidate;
            var end = !cand || Object.keys(cand).length === 0;
            // Edge emits an empty object for RTCIceCandidateComplete‥
            if (end) {
              // polyfill since RTCIceGatherer.state is not implemented in
              // Edge 10547 yet.
              if (iceGatherer.state === undefined) {
                iceGatherer.state = 'completed';
              }

              // Emit a candidate with type endOfCandidates to make the samples
              // work. Edge requires addIceCandidate with this empty candidate
              // to start checking. The real solution is to signal
              // end-of-candidates to the other side when getting the null
              // candidate but some apps (like the samples) don't do that.
              event.candidate.candidate =
                  'candidate:1 1 udp 1 0.0.0.0 9 typ endOfCandidates';
            } else {
              // RTCIceCandidate doesn't have a component, needs to be added
              cand.component = iceTransport.component === 'RTCP' ? 2 : 1;
              event.candidate.candidate = SDPUtils.writeCandidate(cand);
            }

            // update local description.
            var sections = SDPUtils.splitSections(self.localDescription.sdp);
            if (event.candidate.candidate.indexOf('typ endOfCandidates')
                === -1) {
              sections[event.candidate.sdpMLineIndex + 1] +=
                  'a=' + event.candidate.candidate + '\r\n';
            } else {
              sections[event.candidate.sdpMLineIndex + 1] +=
                  'a=end-of-candidates\r\n';
            }
            self.localDescription.sdp = sections.join('');

            var complete = self.transceivers.every(function(transceiver) {
              return transceiver.iceGatherer &&
                  transceiver.iceGatherer.state === 'completed';
            });

            // Emit candidate if localDescription is set.
            // Also emits null candidate when all gatherers are complete.
            switch (self.iceGatheringState) {
              case 'new':
                self._localIceCandidatesBuffer.push(event);
                if (end && complete) {
                  self._localIceCandidatesBuffer.push(
                      new Event('icecandidate'));
                }
                break;
              case 'gathering':
                self._emitBufferedCandidates();
                self.dispatchEvent(event);
                if (self.onicecandidate !== null) {
                  self.onicecandidate(event);
                }
                if (complete) {
                  self.dispatchEvent(new Event('icecandidate'));
                  if (self.onicecandidate !== null) {
                    self.onicecandidate(new Event('icecandidate'));
                  }
                  self.iceGatheringState = 'complete';
                }
                break;
              case 'complete':
                // should not happen... currently!
                break;
              default: // no-op.
                break;
            }
          };
          iceTransport.onicestatechange = function() {
            self._updateConnectionState();
          };

          var dtlsTransport = new RTCDtlsTransport(iceTransport);
          dtlsTransport.ondtlsstatechange = function() {
            self._updateConnectionState();
          };
          dtlsTransport.onerror = function() {
            // onerror does not set state to failed by itself.
            dtlsTransport.state = 'failed';
            self._updateConnectionState();
          };

          return {
            iceGatherer: iceGatherer,
            iceTransport: iceTransport,
            dtlsTransport: dtlsTransport
          };
        };

    // Start the RTP Sender and Receiver for a transceiver.
    window.RTCPeerConnection.prototype._transceive = function(transceiver,
        send, recv) {
      var params = this._getCommonCapabilities(transceiver.localCapabilities,
          transceiver.remoteCapabilities);
      if (send && transceiver.rtpSender) {
        params.encodings = transceiver.sendEncodingParameters;
        params.rtcp = {
          cname: SDPUtils.localCName
        };
        if (transceiver.recvEncodingParameters.length) {
          params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;
        }
        transceiver.rtpSender.send(params);
      }
      if (recv && transceiver.rtpReceiver) {
        params.encodings = transceiver.recvEncodingParameters;
        params.rtcp = {
          cname: transceiver.cname
        };
        if (transceiver.sendEncodingParameters.length) {
          params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;
        }
        transceiver.rtpReceiver.receive(params);
      }
    };

    window.RTCPeerConnection.prototype.setLocalDescription =
        function(description) {
          var self = this;
          var sections;
          var sessionpart;
          if (description.type === 'offer') {
            // FIXME: What was the purpose of this empty if statement?
            // if (!this._pendingOffer) {
            // } else {
            if (this._pendingOffer) {
              // 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);
                self._pendingOffer[sdpMLineIndex].localCapabilities = caps;
              });
              this.transceivers = this._pendingOffer;
              delete this._pendingOffer;
            }
          } else if (description.type === 'answer') {
            sections = SDPUtils.splitSections(self.remoteDescription.sdp);
            sessionpart = sections.shift();
            var isIceLite = SDPUtils.matchPrefix(sessionpart,
                'a=ice-lite').length > 0;
            sections.forEach(function(mediaSection, sdpMLineIndex) {
              var transceiver = self.transceivers[sdpMLineIndex];
              var iceGatherer = transceiver.iceGatherer;
              var iceTransport = transceiver.iceTransport;
              var dtlsTransport = transceiver.dtlsTransport;
              var localCapabilities = transceiver.localCapabilities;
              var remoteCapabilities = transceiver.remoteCapabilities;
              var rejected = mediaSection.split('\n', 1)[0]
                  .split(' ', 2)[1] === '0';

              if (!rejected) {
                var remoteIceParameters = SDPUtils.getIceParameters(
                    mediaSection, sessionpart);
                if (isIceLite) {
                  var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')
                  .map(function(cand) {
                    return SDPUtils.parseCandidate(cand);
                  })
                  .filter(function(cand) {
                    return cand.component === '1';
                  });
                  // ice-lite only includes host candidates in the SDP so we can
                  // use setRemoteCandidates (which implies an
                  // RTCIceCandidateComplete)
                  if (cands.length) {
                    iceTransport.setRemoteCandidates(cands);
                  }
                }
                var remoteDtlsParameters = SDPUtils.getDtlsParameters(
                    mediaSection, sessionpart);
                if (isIceLite) {
                  remoteDtlsParameters.role = 'server';
                }

                if (!self.usingBundle || sdpMLineIndex === 0) {
                  iceTransport.start(iceGatherer, remoteIceParameters,
                      isIceLite ? 'controlling' : 'controlled');
                  dtlsTransport.start(remoteDtlsParameters);
                }

                // Calculate intersection of capabilities.
                var params = self._getCommonCapabilities(localCapabilities,
                    remoteCapabilities);

                // Start the RTCRtpSender. The RTCRtpReceiver for this
                // transceiver has already been started in setRemoteDescription.
                self._transceive(transceiver,
                    params.codecs.length > 0,
                    false);
              }
            });
          }

          this.localDescription = {
            type: description.type,
            sdp: description.sdp
          };
          switch (description.type) {
            case 'offer':
              this._updateSignalingState('have-local-offer');
              break;
            case 'answer':
              this._updateSignalingState('stable');
              break;
            default:
              throw new TypeError('unsupported type "' + description.type +
                  '"');
          }

          // If a success callback was provided, emit ICE candidates after it
          // has been executed. Otherwise, emit callback after the Promise is
          // resolved.
          var hasCallback = arguments.length > 1 &&
            typeof arguments[1] === 'function';
          if (hasCallback) {
            var cb = arguments[1];
            window.setTimeout(function() {
              cb();
              if (self.iceGatheringState === 'new') {
                self.iceGatheringState = 'gathering';
              }
              self._emitBufferedCandidates();
            }, 0);
          }
          var p = Promise.resolve();
          p.then(function() {
            if (!hasCallback) {
              if (self.iceGatheringState === 'new') {
                self.iceGatheringState = 'gathering';
              }
              // Usually candidates will be emitted earlier.
              window.setTimeout(self._emitBufferedCandidates.bind(self), 500);
            }
          });
          return p;
        };

    window.RTCPeerConnection.prototype.setRemoteDescription =
        function(description) {
          var self = this;
          var stream = new MediaStream();
          var receiverList = [];
          var sections = SDPUtils.splitSections(description.sdp);
          var sessionpart = sections.shift();
          var isIceLite = SDPUtils.matchPrefix(sessionpart,
              'a=ice-lite').length > 0;
          this.usingBundle = SDPUtils.matchPrefix(sessionpart,
              'a=group:BUNDLE ').length > 0;
          sections.forEach(function(mediaSection, sdpMLineIndex) {
            var lines = SDPUtils.splitLines(mediaSection);
            var mline = lines[0].substr(2).split(' ');
            var kind = mline[0];
            var rejected = mline[1] === '0';
            var direction = SDPUtils.getDirection(mediaSection, sessionpart);

            var transceiver;
            var iceGatherer;
            var iceTransport;
            var dtlsTransport;
            var rtpSender;
            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 mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:');
            if (mid.length) {
              mid = mid[0].substr(6);
            } else {
              mid = SDPUtils.generateIdentifier();
            }

            var cname;
            // Gets the first SSRC. Note that 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) {
              cname = remoteSsrc.value;
            }

            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';
                });
            if (description.type === 'offer' && !rejected) {
              var transports = self.usingBundle && sdpMLineIndex > 0 ? {
                iceGatherer: self.transceivers[0].iceGatherer,
                iceTransport: self.transceivers[0].iceTransport,
                dtlsTransport: self.transceivers[0].dtlsTransport
              } : self._createIceAndDtlsTransports(mid, sdpMLineIndex);

              if (isComplete) {
                transports.iceTransport.setRemoteCandidates(cands);
              }

              localCapabilities = RTCRtpReceiver.getCapabilities(kind);
              sendEncodingParameters = [{
                ssrc: (2 * sdpMLineIndex + 2) * 1001
              }];

              rtpReceiver = new RTCRtpReceiver(transports.dtlsTransport, kind);

              track = rtpReceiver.track;
              receiverList.push([track, rtpReceiver]);
              // FIXME: not correct when there are multiple streams but that is
              // not currently supported in this shim.
              stream.addTrack(track);

              // FIXME: look at direction.
              if (self.localStreams.length > 0 &&
                  self.localStreams[0].getTracks().length >= sdpMLineIndex) {
                var localTrack;
                if (kind === 'audio') {
                  localTrack = self.localStreams[0].getAudioTracks()[0];
                } else if (kind === 'video') {
                  localTrack = self.localStreams[0].getVideoTracks()[0];
                }
                if (localTrack) {
                  rtpSender = new RTCRtpSender(localTrack,
                      transports.dtlsTransport);
                }
              }

              self.transceivers[sdpMLineIndex] = {
                iceGatherer: transports.iceGatherer,
                iceTransport: transports.iceTransport,
                dtlsTransport: transports.dtlsTransport,
                localCapabilities: localCapabilities,
                remoteCapabilities: remoteCapabilities,
                rtpSender: rtpSender,
                rtpReceiver: rtpReceiver,
                kind: kind,
                mid: mid,
                cname: cname,
                sendEncodingParameters: sendEncodingParameters,
                recvEncodingParameters: recvEncodingParameters
              };
              // Start the RTCRtpReceiver now. The RTPSender is started in
              // setLocalDescription.
              self._transceive(self.transceivers[sdpMLineIndex],
                  false,
                  direction === 'sendrecv' || direction === 'sendonly');
            } else if (description.type === 'answer' && !rejected) {
              transceiver = self.transceivers[sdpMLineIndex];
              iceGatherer = transceiver.iceGatherer;
              iceTransport = transceiver.iceTransport;
              dtlsTransport = transceiver.dtlsTransport;
              rtpSender = transceiver.rtpSender;
              rtpReceiver = transceiver.rtpReceiver;
              sendEncodingParameters = transceiver.sendEncodingParameters;
              localCapabilities = transceiver.localCapabilities;

              self.transceivers[sdpMLineIndex].recvEncodingParameters =
                  recvEncodingParameters;
              self.transceivers[sdpMLineIndex].remoteCapabilities =
                  remoteCapabilities;
              self.transceivers[sdpMLineIndex].cname = cname;

              if ((isIceLite || isComplete) && cands.length) {
                iceTransport.setRemoteCandidates(cands);
              }
              if (!self.usingBundle || sdpMLineIndex === 0) {
                iceTransport.start(iceGatherer, remoteIceParameters,
                    'controlling');
                dtlsTransport.start(remoteDtlsParameters);
              }

              self._transceive(transceiver,
                  direction === 'sendrecv' || direction === 'recvonly',
                  direction === 'sendrecv' || direction === 'sendonly');

              if (rtpReceiver &&
                  (direction === 'sendrecv' || direction === 'sendonly')) {
                track = rtpReceiver.track;
                receiverList.push([track, rtpReceiver]);
                stream.addTrack(track);
              } else {
                // FIXME: actually the receiver should be created later.
                delete transceiver.rtpReceiver;
              }
            }
          });

          this.remoteDescription = {
            type: description.type,
            sdp: description.sdp
          };
          switch (description.type) {
            case 'offer':
              this._updateSignalingState('have-remote-offer');
              break;
            case 'answer':
              this._updateSignalingState('stable');
              break;
            default:
              throw new TypeError('unsupported type "' + description.type +
                  '"');
          }
          if (stream.getTracks().length) {
            self.remoteStreams.push(stream);
            window.setTimeout(function() {
              var event = new Event('addstream');
              event.stream = stream;
              self.dispatchEvent(event);
              if (self.onaddstream !== null) {
                window.setTimeout(function() {
                  self.onaddstream(event);
                }, 0);
              }

              receiverList.forEach(function(item) {
                var track = item[0];
                var receiver = item[1];
                var trackEvent = new Event('track');
                trackEvent.track = track;
                trackEvent.receiver = receiver;
                trackEvent.streams = [stream];
                self.dispatchEvent(event);
                if (self.ontrack !== null) {
                  window.setTimeout(function() {
                    self.ontrack(trackEvent);
                  }, 0);
                }
              });
            }, 0);
          }
          if (arguments.length > 1 && typeof arguments[1] === 'function') {
            window.setTimeout(arguments[1], 0);
          }
          return Promise.resolve();
        };

    window.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._updateSignalingState('closed');
    };

    // Update the signaling state.
    window.RTCPeerConnection.prototype._updateSignalingState =
        function(newState) {
          this.signalingState = newState;
          var event = new Event('signalingstatechange');
          this.dispatchEvent(event);
          if (this.onsignalingstatechange !== null) {
            this.onsignalingstatechange(event);
          }
        };

    // Determine whether to fire the negotiationneeded event.
    window.RTCPeerConnection.prototype._maybeFireNegotiationNeeded =
        function() {
          // Fire away (for now).
          var event = new Event('negotiationneeded');
          this.dispatchEvent(event);
          if (this.onnegotiationneeded !== null) {
            this.onnegotiationneeded(event);
          }
        };

    // Update the connection state.
    window.RTCPeerConnection.prototype._updateConnectionState = function() {
      var self = this;
      var newState;
      var states = {
        'new': 0,
        closed: 0,
        connecting: 0,
        checking: 0,
        connected: 0,
        completed: 0,
        failed: 0
      };
      this.transceivers.forEach(function(transceiver) {
        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 || states.checking > 0) {
        newState = 'connecting';
      } else if (states.disconnected > 0) {
        newState = 'disconnected';
      } else if (states.new > 0) {
        newState = 'new';
      } else if (states.connected > 0 || states.completed > 0) {
        newState = 'connected';
      }

      if (newState !== self.iceConnectionState) {
        self.iceConnectionState = newState;
        var event = new Event('iceconnectionstatechange');
        this.dispatchEvent(event);
        if (this.oniceconnectionstatechange !== null) {
          this.oniceconnectionstatechange(event);
        }
      }
    };

    window.RTCPeerConnection.prototype.createOffer = function() {
      var self = this;
      if (this._pendingOffer) {
        throw new Error('createOffer called while there is a pending offer.');
      }
      var offerOptions;
      if (arguments.length === 1 && typeof arguments[0] !== 'function') {
        offerOptions = arguments[0];
      } else if (arguments.length === 3) {
        offerOptions = arguments[2];
      }

      var tracks = [];
      var numAudioTracks = 0;
      var numVideoTracks = 0;
      // Default to sendrecv.
      if (this.localStreams.length) {
        numAudioTracks = this.localStreams[0].getAudioTracks().length;
        numVideoTracks = this.localStreams[0].getVideoTracks().length;
      }
      // Determine number of audio and video tracks we need to send/recv.
      if (offerOptions) {
        // Reject Chrome legacy constraints.
        if (offerOptions.mandatory || offerOptions.optional) {
          throw new TypeError(
              'Legacy mandatory/optional constraints not supported.');
        }
        if (offerOptions.offerToReceiveAudio !== undefined) {
          numAudioTracks = offerOptions.offerToReceiveAudio;
        }
        if (offerOptions.offerToReceiveVideo !== undefined) {
          numVideoTracks = offerOptions.offerToReceiveVideo;
        }
      }
      if (this.localStreams.length) {
        // Push local streams.
        this.localStreams[0].getTracks().forEach(function(track) {
          tracks.push({
            kind: track.kind,
            track: track,
            wantReceive: track.kind === 'audio' ?
                numAudioTracks > 0 : numVideoTracks > 0
          });
          if (track.kind === 'audio') {
            numAudioTracks--;
          } else if (track.kind === 'video') {
            numVideoTracks--;
          }
        });
      }
      // Create M-lines for recvonly streams.
      while (numAudioTracks > 0 || numVideoTracks > 0) {
        if (numAudioTracks > 0) {
          tracks.push({
            kind: 'audio',
            wantReceive: true
          });
          numAudioTracks--;
        }
        if (numVideoTracks > 0) {
          tracks.push({
            kind: 'video',
            wantReceive: true
          });
          numVideoTracks--;
        }
      }

      var sdp = SDPUtils.writeSessionBoilerplate();
      var transceivers = [];
      tracks.forEach(function(mline, sdpMLineIndex) {
        // For each track, create an ice gatherer, ice transport,
        // dtls transport, potentially rtpsender and rtpreceiver.
        var track = mline.track;
        var kind = mline.kind;
        var mid = SDPUtils.generateIdentifier();

        var transports = self.usingBundle && sdpMLineIndex > 0 ? {
          iceGatherer: transceivers[0].iceGatherer,
          iceTransport: transceivers[0].iceTransport,
          dtlsTransport: transceivers[0].dtlsTransport
        } : self._createIceAndDtlsTransports(mid, sdpMLineIndex);

        var localCapabilities = RTCRtpSender.getCapabilities(kind);
        var rtpSender;
        var rtpReceiver;

        // generate an ssrc now, to be used later in rtpSender.send
        var sendEncodingParameters = [{
          ssrc: (2 * sdpMLineIndex + 1) * 1001
        }];
        if (track) {
          rtpSender = new RTCRtpSender(track, transports.dtlsTransport);
        }

        if (mline.wantReceive) {
          rtpReceiver = new RTCRtpReceiver(transports.dtlsTransport, kind);
        }

        transceivers[sdpMLineIndex] = {
          iceGatherer: transports.iceGatherer,
          iceTransport: transports.iceTransport,
          dtlsTransport: transports.dtlsTransport,
          localCapabilities: localCapabilities,
          remoteCapabilities: null,
          rtpSender: rtpSender,
          rtpReceiver: rtpReceiver,
          kind: kind,
          mid: mid,
          sendEncodingParameters: sendEncodingParameters,
          recvEncodingParameters: null
        };
      });
      if (this.usingBundle) {
        sdp += 'a=group:BUNDLE ' + transceivers.map(function(t) {
          return t.mid;
        }).join(' ') + '\r\n';
      }
      tracks.forEach(function(mline, sdpMLineIndex) {
        var transceiver = transceivers[sdpMLineIndex];
        sdp += SDPUtils.writeMediaSection(transceiver,
            transceiver.localCapabilities, 'offer', self.localStreams[0]);
      });

      this._pendingOffer = transceivers;
      var desc = new RTCSessionDescription({
        type: 'offer',
        sdp: sdp
      });
      if (arguments.length && typeof arguments[0] === 'function') {
        window.setTimeout(arguments[0], 0, desc);
      }
      return Promise.resolve(desc);
    };

    window.RTCPeerConnection.prototype.createAnswer = function() {
      var self = this;

      var sdp = SDPUtils.writeSessionBoilerplate();
      if (this.usingBundle) {
        sdp += 'a=group:BUNDLE ' + this.transceivers.map(function(t) {
          return t.mid;
        }).join(' ') + '\r\n';
      }
      this.transceivers.forEach(function(transceiver) {
        // Calculate intersection of capabilities.
        var commonCapabilities = self._getCommonCapabilities(
            transceiver.localCapabilities,
            transceiver.remoteCapabilities);

        sdp += SDPUtils.writeMediaSection(transceiver, commonCapabilities,
            'answer', self.localStreams[0]);
      });

      var desc = new RTCSessionDescription({
        type: 'answer',
        sdp: sdp
      });
      if (arguments.length && typeof arguments[0] === 'function') {
        window.setTimeout(arguments[0], 0, desc);
      }
      return Promise.resolve(desc);
    };

    window.RTCPeerConnection.prototype.addIceCandidate = function(candidate) {
      if (candidate === null) {
        this.transceivers.forEach(function(transceiver) {
          transceiver.iceTransport.addRemoteCandidate({});
        });
      } else {
        var mLineIndex = candidate.sdpMLineIndex;
        if (candidate.sdpMid) {
          for (var i = 0; i < this.transceivers.length; i++) {
            if (this.transceivers[i].mid === candidate.sdpMid) {
              mLineIndex = i;
              break;
            }
          }
        }
        var transceiver = this.transceivers[mLineIndex];
        if (transceiver) {
          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;
          }
          // Ignore RTCP candidates, we assume RTCP-MUX.
          if (cand.component !== '1') {
            return;
          }
          // A dirty hack to make samples work.
          if (cand.type === 'endOfCandidates') {
            cand = {};
          }
          transceiver.iceTransport.addRemoteCandidate(cand);

          // update the remoteDescription.
          var sections = SDPUtils.splitSections(this.remoteDescription.sdp);
          sections[mLineIndex + 1] += (cand.type ? candidate.candidate.trim()
              : 'a=end-of-candidates') + '\r\n';
          this.remoteDescription.sdp = sections.join('');
        }
      }
      if (arguments.length > 1 && typeof arguments[1] === 'function') {
        window.setTimeout(arguments[1], 0);
      }
      return Promise.resolve();
    };

    window.RTCPeerConnection.prototype.getStats = function() {
      var promises = [];
      this.transceivers.forEach(function(transceiver) {
        ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',
            'dtlsTransport'].forEach(function(method) {
              if (transceiver[method]) {
                promises.push(transceiver[method].getStats());
              }
            });
      });
      var cb = arguments.length > 1 && typeof arguments[1] === 'function' &&
          arguments[1];
      return new Promise(function(resolve) {
        // shim getStats with maplike support
        var results = new Map();
        Promise.all(promises).then(function(res) {
          res.forEach(function(result) {
            Object.keys(result).forEach(function(id) {
              results.set(id, result[id]);
              results[id] = result[id];
            });
          });
          if (cb) {
            window.setTimeout(cb, 0, results);
          }
          resolve(results);
        });
      });
    };
  }
};

// Expose public methods.
module.exports = {
  shimPeerConnection: edgeShim.shimPeerConnection,
  shimGetUserMedia: require('./getusermedia')
};

},{"../utils":15,"./getusermedia":11,"sdp":4}],11:[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';

// Expose public methods.
module.exports = function() {
  var shimError_ = function(e) {
    return {
      name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,
      message: e.message,
      constraint: e.constraint,
      toString: function() {
        return this.name;
      }
    };
  };

  // getUserMedia error shim.
  var origGetUserMedia = navigator.mediaDevices.getUserMedia.
      bind(navigator.mediaDevices);
  navigator.mediaDevices.getUserMedia = function(c) {
    return origGetUserMedia(c).catch(function(e) {
      return Promise.reject(shimError_(e));
    });
  };
};

},{}],12:[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 browserDetails = require('../utils').browserDetails;

var firefoxShim = {
  shimOnTrack: function() {
    if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
        window.RTCPeerConnection.prototype)) {
      Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
        get: function() {
          return this._ontrack;
        },
        set: function(f) {
          if (this._ontrack) {
            this.removeEventListener('track', this._ontrack);
            this.removeEventListener('addstream', this._ontrackpoly);
          }
          this.addEventListener('track', this._ontrack = f);
          this.addEventListener('addstream', this._ontrackpoly = function(e) {
            e.stream.getTracks().forEach(function(track) {
              var event = new Event('track');
              event.track = track;
              event.receiver = {track: track};
              event.streams = [e.stream];
              this.dispatchEvent(event);
            }.bind(this));
          }.bind(this));
        }
      });
    }
  },

  shimSourceObject: function() {
    // Firefox has supported mozSrcObject since FF22, unprefixed in 42.
    if (typeof window === 'object') {
      if (window.HTMLMediaElement &&
        !('srcObject' in window.HTMLMediaElement.prototype)) {
        // Shim the srcObject property, once, when HTMLMediaElement is found.
        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {
          get: function() {
            return this.mozSrcObject;
          },
          set: function(stream) {
            this.mozSrcObject = stream;
          }
        });
      }
    }
  },

  shimPeerConnection: function() {
    if (typeof window !== 'object' || !(window.RTCPeerConnection ||
        window.mozRTCPeerConnection)) {
      return; // probably media.peerconnection.enabled=false in about:config
    }
    // The RTCPeerConnection object.
    if (!window.RTCPeerConnection) {
      window.RTCPeerConnection = function(pcConfig, pcConstraints) {
        if (browserDetails.version < 38) {
          // .urls is not supported in FF < 38.
          // create RTCIceServers with a single url.
          if (pcConfig && pcConfig.iceServers) {
            var newIceServers = [];
            for (var i = 0; i < pcConfig.iceServers.length; i++) {
              var server = pcConfig.iceServers[i];
              if (server.hasOwnProperty('urls')) {
                for (var j = 0; j < server.urls.length; j++) {
                  var newServer = {
                    url: server.urls[j]
                  };
                  if (server.urls[j].indexOf('turn') === 0) {
                    newServer.username = server.username;
                    newServer.credential = server.credential;
                  }
                  newIceServers.push(newServer);
                }
              } else {
                newIceServers.push(pcConfig.iceServers[i]);
              }
            }
            pcConfig.iceServers = newIceServers;
          }
        }
        return new mozRTCPeerConnection(pcConfig, pcConstraints);
      };
      window.RTCPeerConnection.prototype = mozRTCPeerConnection.prototype;

      // wrap static methods. Currently just generateCertificate.
      if (mozRTCPeerConnection.generateCertificate) {
        Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
          get: function() {
            return mozRTCPeerConnection.generateCertificate;
          }
        });
      }

      window.RTCSessionDescription = mozRTCSessionDescription;
      window.RTCIceCandidate = mozRTCIceCandidate;
    }

    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.
    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
        .forEach(function(method) {
          var nativeMethod = RTCPeerConnection.prototype[method];
          RTCPeerConnection.prototype[method] = function() {
            arguments[0] = new ((method === 'addIceCandidate') ?
                RTCIceCandidate : RTCSessionDescription)(arguments[0]);
            return nativeMethod.apply(this, arguments);
          };
        });

    // support for addIceCandidate(null)
    var nativeAddIceCandidate =
        RTCPeerConnection.prototype.addIceCandidate;
    RTCPeerConnection.prototype.addIceCandidate = function() {
      return arguments[0] === null ? Promise.resolve()
          : nativeAddIceCandidate.apply(this, arguments);
    };

    // shim getStats with maplike support
    var makeMapStats = function(stats) {
      var map = new Map();
      Object.keys(stats).forEach(function(key) {
        map.set(key, stats[key]);
        map[key] = stats[key];
      });
      return map;
    };

    var nativeGetStats = RTCPeerConnection.prototype.getStats;
    RTCPeerConnection.prototype.getStats = function(selector, onSucc, onErr) {
      return nativeGetStats.apply(this, [selector || null])
        .then(function(stats) {
          return makeMapStats(stats);
        })
        .then(onSucc, onErr);
    };
  }
};

// Expose public methods.
module.exports = {
  shimOnTrack: firefoxShim.shimOnTrack,
  shimSourceObject: firefoxShim.shimSourceObject,
  shimPeerConnection: firefoxShim.shimPeerConnection,
  shimGetUserMedia: require('./getusermedia')
};

},{"../utils":15,"./getusermedia":13}],13:[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 logging = require('../utils').log;
var browserDetails = require('../utils').browserDetails;

// Expose public methods.
module.exports = function() {
  var shimError_ = function(e) {
    return {
      name: {
        SecurityError: 'NotAllowedError',
        PermissionDeniedError: 'NotAllowedError'
      }[e.name] || e.name,
      message: {
        'The operation is insecure.': 'The request is not allowed by the ' +
        'user agent or the platform in the current context.'
      }[e.message] || e.message,
      constraint: e.constraint,
      toString: function() {
        return this.name + (this.message && ': ') + this.message;
      }
    };
  };

  // getUserMedia constraints shim.
  var getUserMedia_ = function(constraints, onSuccess, onError) {
    var constraintsToFF37_ = function(c) {
      if (typeof c !== 'object' || c.require) {
        return c;
      }
      var require = [];
      Object.keys(c).forEach(function(key) {
        if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
          return;
        }
        var r = c[key] = (typeof c[key] === 'object') ?
            c[key] : {ideal: c[key]};
        if (r.min !== undefined ||
            r.max !== undefined || r.exact !== undefined) {
          require.push(key);
        }
        if (r.exact !== undefined) {
          if (typeof r.exact === 'number') {
            r. min = r.max = r.exact;
          } else {
            c[key] = r.exact;
          }
          delete r.exact;
        }
        if (r.ideal !== undefined) {
          c.advanced = c.advanced || [];
          var oc = {};
          if (typeof r.ideal === 'number') {
            oc[key] = {min: r.ideal, max: r.ideal};
          } else {
            oc[key] = r.ideal;
          }
          c.advanced.push(oc);
          delete r.ideal;
          if (!Object.keys(r).length) {
            delete c[key];
          }
        }
      });
      if (require.length) {
        c.require = require;
      }
      return c;
    };
    constraints = JSON.parse(JSON.stringify(constraints));
    if (browserDetails.version < 38) {
      logging('spec: ' + JSON.stringify(constraints));
      if (constraints.audio) {
        constraints.audio = constraintsToFF37_(constraints.audio);
      }
      if (constraints.video) {
        constraints.video = constraintsToFF37_(constraints.video);
      }
      logging('ff37: ' + JSON.stringify(constraints));
    }
    return navigator.mozGetUserMedia(constraints, onSuccess, function(e) {
      onError(shimError_(e));
    });
  };

  // Returns the result of getUserMedia as a Promise.
  var getUserMediaPromise_ = function(constraints) {
    return new Promise(function(resolve, reject) {
      getUserMedia_(constraints, resolve, reject);
    });
  };

  // Shim for mediaDevices on older versions.
  if (!navigator.mediaDevices) {
    navigator.mediaDevices = {getUserMedia: getUserMediaPromise_,
      addEventListener: function() { },
      removeEventListener: function() { }
    };
  }
  navigator.mediaDevices.enumerateDevices =
      navigator.mediaDevices.enumerateDevices || function() {
        return new Promise(function(resolve) {
          var infos = [
            {kind: 'audioinput', deviceId: 'default', label: '', groupId: ''},
            {kind: 'videoinput', deviceId: 'default', label: '', groupId: ''}
          ];
          resolve(infos);
        });
      };

  if (browserDetails.version < 41) {
    // Work around http://bugzil.la/1169665
    var orgEnumerateDevices =
        navigator.mediaDevices.enumerateDevices.bind(navigator.mediaDevices);
    navigator.mediaDevices.enumerateDevices = function() {
      return orgEnumerateDevices().then(undefined, function(e) {
        if (e.name === 'NotFoundError') {
          return [];
        }
        throw e;
      });
    };
  }
  if (browserDetails.version < 49) {
    var origGetUserMedia = navigator.mediaDevices.getUserMedia.
        bind(navigator.mediaDevices);
    navigator.mediaDevices.getUserMedia = function(c) {
      return origGetUserMedia(c).catch(function(e) {
        return Promise.reject(shimError_(e));
      });
    };
  }
  navigator.getUserMedia = function(constraints, onSuccess, onError) {
    if (browserDetails.version < 44) {
      return getUserMedia_(constraints, onSuccess, onError);
    }
    // Replace Firefox 44+'s deprecation warning with unprefixed version.
    console.warn('navigator.getUserMedia has been replaced by ' +
                 'navigator.mediaDevices.getUserMedia');
    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
  };
};

},{"../utils":15}],14:[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';
var safariShim = {
  // TODO: DrAlex, should be here, double check against LayoutTests
  // shimOnTrack: function() { },

  // TODO: once the back-end for the mac port is done, add.
  // TODO: check for webkitGTK+
  // shimPeerConnection: function() { },

  shimGetUserMedia: function() {
    navigator.getUserMedia = navigator.webkitGetUserMedia;
  }
};

// Expose public methods.
module.exports = {
  shimGetUserMedia: safariShim.shimGetUserMedia
  // TODO
  // shimOnTrack: safariShim.shimOnTrack,
  // shimPeerConnection: safariShim.shimPeerConnection
};

},{}],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 logDisabled_ = true;

// Utility methods.
var utils = {
  disableLog: function(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';
  },

  log: function() {
    if (typeof window === 'object') {
      if (logDisabled_) {
        return;
      }
      if (typeof console !== 'undefined' && typeof console.log === 'function') {
        console.log.apply(console, arguments);
      }
    }
  },

  /**
   * 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.
   */
  extractVersion: function(uastring, expr, pos) {
    var match = uastring.match(expr);
    return match && match.length >= pos && parseInt(match[pos], 10);
  },

  /**
   * Browser detector.
   *
   * @return {object} result containing browser and version
   *     properties.
   */
  detectBrowser: function() {
    // Returned result object.
    var result = {};
    result.browser = null;
    result.version = null;

    // Fail early if it's not a browser
    if (typeof window === 'undefined' || !window.navigator) {
      result.browser = 'Not a browser.';
      return result;
    }

    // Firefox.
    if (navigator.mozGetUserMedia) {
      result.browser = 'firefox';
      result.version = this.extractVersion(navigator.userAgent,
          /Firefox\/([0-9]+)\./, 1);

    // all webkit-based browsers
    } else if (navigator.webkitGetUserMedia) {
      // Chrome, Chromium, Webview, Opera, all use the chrome shim for now
      if (window.webkitRTCPeerConnection) {
        result.browser = 'chrome';
        result.version = this.extractVersion(navigator.userAgent,
          /Chrom(e|ium)\/([0-9]+)\./, 2);

      // Safari or unknown webkit-based
      // for the time being Safari has support for MediaStreams but not webRTC
      } else {
        // Safari UA substrings of interest for reference:
        // - webkit version:           AppleWebKit/602.1.25 (also used in Op,Cr)
        // - safari UI version:        Version/9.0.3 (unique to Safari)
        // - safari UI webkit version: Safari/601.4.4 (also used in Op,Cr)
        //
        // if the webkit version and safari UI webkit versions are equals,
        // ... this is a stable version.
        //
        // only the internal webkit version is important today to know if
        // media streams are supported
        //
        if (navigator.userAgent.match(/Version\/(\d+).(\d+)/)) {
          result.browser = 'safari';
          result.version = this.extractVersion(navigator.userAgent,
            /AppleWebKit\/([0-9]+)\./, 1);

        // unknown webkit-based browser
        } else {
          result.browser = 'Unsupported webkit-based browser ' +
              'with GUM support but no WebRTC support.';
          return result;
        }
      }

    // Edge.
    } else if (navigator.mediaDevices &&
        navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)) {
      result.browser = 'edge';
      result.version = this.extractVersion(navigator.userAgent,
          /Edge\/(\d+).(\d+)$/, 2);

    // Default fallthrough: not supported.
    } else {
      result.browser = 'Not a supported browser.';
      return result;
    }

    return result;
  }
};

// Export.
module.exports = {
  log: utils.log,
  disableLog: utils.disableLog,
  browserDetails: utils.detectBrowser(),
  extractVersion: utils.extractVersion
};

},{}],16:[function(require,module,exports){
/*
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);

},{}]},{},[1])(1)
});