text: (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.adapter = 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){
   /* 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: parseInt(parts[1], 10),
      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: // extension handling, in particular ufrag
          candidate[parts[i]] = parts[i + 1];
          break;
      }
    }
    return candidate;
  };
  
  // Translates a candidate object into SDP candidate attribute.
  SDPUtils.writeCandidate = function(candidate) {
    var sdp = [];
    sdp.push(candidate.foundation);
    sdp.push(candidate.component);
    sdp.push(candidate.protocol.toUpperCase());
    sdp.push(candidate.priority);
    sdp.push(candidate.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 ice-options line, returns an array of option tags.
  // a=ice-options:foo bar
  SDPUtils.parseIceOptions = function(line) {
    return line.substr(14).split(' ');
  }
  
  // Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:
  // a=rtpmap:111 opus/48000/2
  SDPUtils.parseRtpMap = function(line) {
    var parts = line.substr(9).split(' ');
    var parsed = {
      payloadType: parseInt(parts.shift(), 10) // was: id
    };
  
    parts = parts[0].split('/');
  
    parsed.name = parts[0];
    parsed.clockRate = parseInt(parts[1], 10); // was: clockrate
    // 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
  // a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset
  SDPUtils.parseExtmap = function(line) {
    var parts = line.substr(9).split(' ');
    return {
      id: parseInt(parts[0], 10),
      direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',
      uri: parts[1]
    };
  };
  
  // Generates a=extmap line from RTCRtpHeaderExtensionParameters or
  // RTCRtpHeaderExtension.
  SDPUtils.writeExtmap = function(headerExtension) {
    return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +
        (headerExtension.direction && headerExtension.direction !== 'sendrecv'
            ? '/' + headerExtension.direction
            : '') +
        ' ' + headerExtension.uri + '\r\n';
  };
  
  // Parses an ftmp line, returns dictionary. Sample input:
  // a=fmtp:96 vbr=on;cng=on
  // Also deals with vbr=on; cng=on
  SDPUtils.parseFmtp = function(line) {
    var parsed = {};
    var kv;
    var parts = line.substr(line.indexOf(' ') + 1).split(';');
    for (var j = 0; j < parts.length; j++) {
      kv = parts[j].trim().split('=');
      parsed[kv[0].trim()] = kv[1];
    }
    return parsed;
  };
  
  // Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.
  SDPUtils.writeFmtp = function(codec) {
    var line = '';
    var pt = codec.payloadType;
    if (codec.preferredPayloadType !== undefined) {
      pt = codec.preferredPayloadType;
    }
    if (codec.parameters && Object.keys(codec.parameters).length) {
      var params = [];
      Object.keys(codec.parameters).forEach(function(param) {
        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 the MID (RFC 5888) from a media section.
  // returns the MID or undefined if no mid line was found.
  SDPUtils.getMid = function(mediaSection) {
    var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];
    if (mid) {
      return mid.substr(6);
    }
  }
  
  SDPUtils.parseFingerprint = function(line) {
    var parts = line.substr(14).split(' ');
    return {
      algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.
      value: parts[1]
    };
  };
  
  // Extracts DTLS parameters from SDP media section or sessionpart.
  // FIXME: for consistency with other functions this should only
  //   get the fingerprint line as input. See also getIceParameters.
  SDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {
    var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,
        'a=fingerprint:');
    // Note: a=setup line is ignored since we use the 'auto' role.
    // Note2: 'algorithm' is not case sensitive except in Edge.
    return {
      role: 'auto',
      fingerprints: lines.map(SDPUtils.parseFingerprint)
    };
  };
  
  // Serializes DTLS parameters to SDP.
  SDPUtils.writeDtlsParameters = function(params, setupType) {
    var sdp = 'a=setup:' + setupType + '\r\n';
    params.fingerprints.forEach(function(fp) {
      sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\r\n';
    });
    return sdp;
  };
  // Parses ICE information from SDP media section or sessionpart.
  // FIXME: for consistency with other functions this should only
  //   get the ice-ufrag and ice-pwd lines as input.
  SDPUtils.getIceParameters = function(mediaSection, sessionpart) {
    var lines = SDPUtils.splitLines(mediaSection);
    // Search in session part, too.
    lines = lines.concat(SDPUtils.splitLines(sessionpart));
    var iceParameters = {
      usernameFragment: lines.filter(function(line) {
        return line.indexOf('a=ice-ufrag:') === 0;
      })[0].substr(12),
      password: lines.filter(function(line) {
        return line.indexOf('a=ice-pwd:') === 0;
      })[0].substr(10)
    };
    return iceParameters;
  };
  
  // Serializes ICE parameters to SDP.
  SDPUtils.writeIceParameters = function(params) {
    return 'a=ice-ufrag:' + params.usernameFragment + '\r\n' +
        'a=ice-pwd:' + params.password + '\r\n';
  };
  
  // Parses the SDP media section and returns RTCRtpParameters.
  SDPUtils.parseRtpParameters = function(mediaSection) {
    var description = {
      codecs: [],
      headerExtensions: [],
      fecMechanisms: [],
      rtcp: []
    };
    var lines = SDPUtils.splitLines(mediaSection);
    var mline = lines[0].split(' ');
    for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]
      var pt = mline[i];
      var rtpmapline = SDPUtils.matchPrefix(
          mediaSection, 'a=rtpmap:' + pt + ' ')[0];
      if (rtpmapline) {
        var codec = SDPUtils.parseRtpMap(rtpmapline);
        var fmtps = SDPUtils.matchPrefix(
            mediaSection, 'a=fmtp:' + pt + ' ');
        // Only the first a=fmtp:<pt> is considered.
        codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};
        codec.rtcpFeedback = SDPUtils.matchPrefix(
            mediaSection, 'a=rtcp-fb:' + pt + ' ')
          .map(SDPUtils.parseRtcpFb);
        description.codecs.push(codec);
        // parse FEC mechanisms from rtpmap lines.
        switch (codec.name.toUpperCase()) {
          case 'RED':
          case 'ULPFEC':
            description.fecMechanisms.push(codec.name.toUpperCase());
            break;
          default: // only RED and ULPFEC are recognized as FEC mechanisms.
            break;
        }
      }
    }
    SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {
      description.headerExtensions.push(SDPUtils.parseExtmap(line));
    });
    // FIXME: parse rtcp.
    return description;
  };
  
  // Generates parts of the SDP media section describing the capabilities /
  // parameters.
  SDPUtils.writeRtpDescription = function(kind, caps) {
    var sdp = '';
  
    // Build the mline.
    sdp += 'm=' + kind + ' ';
    sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.
    sdp += ' UDP/TLS/RTP/SAVPF ';
    sdp += caps.codecs.map(function(codec) {
      if (codec.preferredPayloadType !== undefined) {
        return codec.preferredPayloadType;
      }
      return codec.payloadType;
    }).join(' ') + '\r\n';
  
    sdp += 'c=IN IP4 0.0.0.0\r\n';
    sdp += 'a=rtcp:9 IN IP4 0.0.0.0\r\n';
  
    // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.
    caps.codecs.forEach(function(codec) {
      sdp += SDPUtils.writeRtpMap(codec);
      sdp += SDPUtils.writeFmtp(codec);
      sdp += SDPUtils.writeRtcpFb(codec);
    });
    var maxptime = 0;
    caps.codecs.forEach(function(codec) {
      if (codec.maxptime > maxptime) {
        maxptime = codec.maxptime;
      }
    });
    if (maxptime > 0) {
      sdp += 'a=maxptime:' + maxptime + '\r\n';
    }
    sdp += 'a=rtcp-mux\r\n';
  
    caps.headerExtensions.forEach(function(extension) {
      sdp += SDPUtils.writeExtmap(extension);
    });
    // FIXME: write fecMechanisms.
    return sdp;
  };
  
  // Parses the SDP media section and returns an array of
  // RTCRtpEncodingParameters.
  SDPUtils.parseRtpEncodingParameters = function(mediaSection) {
    var encodingParameters = [];
    var description = SDPUtils.parseRtpParameters(mediaSection);
    var hasRed = description.fecMechanisms.indexOf('RED') !== -1;
    var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;
  
    // filter a=ssrc:... cname:, ignore PlanB-msid
    var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
    .map(function(line) {
      return SDPUtils.parseSsrcMedia(line);
    })
    .filter(function(parts) {
      return parts.attribute === 'cname';
    });
    var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;
    var secondarySsrc;
  
    var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')
    .map(function(line) {
      var parts = line.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: {
            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;
  };
  
  // parses http://draft.ortc.org/#rtcrtcpparameters*
  SDPUtils.parseRtcpParameters = function(mediaSection) {
    var rtcpParameters = {};
  
    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) {
      rtcpParameters.cname = remoteSsrc.value;
      rtcpParameters.ssrc = remoteSsrc.ssrc;
    }
  
    // Edge uses the compound attribute instead of reducedSize
    // compound is !reducedSize
    var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');
    rtcpParameters.reducedSize = rsize.length > 0;
    rtcpParameters.compound = rsize.length === 0;
  
    // parses the rtcp-mux attrіbute.
    // Note that Edge does not support unmuxed RTCP.
    var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');
    rtcpParameters.mux = mux.length > 0;
  
    return rtcpParameters;
  };
  
  // parses either a=msid: or a=ssrc:... msid lines an returns
  // the id of the MediaStream and MediaStreamTrack.
  SDPUtils.parseMsid = function(mediaSection) {
    var parts;
    var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');
    if (spec.length === 1) {
      parts = spec[0].substr(7).split(' ');
      return {stream: parts[0], track: parts[1]};
    }
    var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
    .map(function(line) {
      return SDPUtils.parseSsrcMedia(line);
    })
    .filter(function(parts) {
      return parts.attribute === 'msid';
    });
    if (planB.length > 0) {
      parts = planB[0].value.split(' ');
      return {stream: parts[0], track: parts[1]};
    }
  };
  
  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.direction) {
      sdp += 'a=' + transceiver.direction + '\r\n';
    } else if (transceiver.rtpSender && transceiver.rtpReceiver) {
      sdp += 'a=sendrecv\r\n';
    } else if (transceiver.rtpSender) {
      sdp += 'a=sendonly\r\n';
    } else if (transceiver.rtpReceiver) {
      sdp += 'a=recvonly\r\n';
    } else {
      sdp += 'a=inactive\r\n';
    }
  
    if (transceiver.rtpSender) {
      // spec.
      var msid = 'msid:' + stream.id + ' ' +
          transceiver.rtpSender.track.id + '\r\n';
      sdp += 'a=' + msid;
  
      // for Chrome.
      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
          ' ' + msid;
      if (transceiver.sendEncodingParameters[0].rtx) {
        sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
            ' ' + msid;
        sdp += 'a=ssrc-group:FID ' +
            transceiver.sendEncodingParameters[0].ssrc + ' ' +
            transceiver.sendEncodingParameters[0].rtx.ssrc +
            '\r\n';
      }
    }
    // FIXME: this should be written by writeRtpDescription.
    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
        ' cname:' + SDPUtils.localCName + '\r\n';
    if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
          ' cname:' + SDPUtils.localCName + '\r\n';
    }
    return sdp;
  };
  
  // Gets the direction from the mediaSection or the sessionpart.
  SDPUtils.getDirection = function(mediaSection, sessionpart) {
    // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.
    var lines = SDPUtils.splitLines(mediaSection);
    for (var i = 0; i < lines.length; i++) {
      switch (lines[i]) {
        case 'a=sendrecv':
        case 'a=sendonly':
        case 'a=recvonly':
        case 'a=inactive':
          return lines[i].substr(2);
        default:
          // FIXME: What should happen here?
      }
    }
    if (sessionpart) {
      return SDPUtils.getDirection(sessionpart);
    }
    return 'sendrecv';
  };
  
  SDPUtils.getKind = function(mediaSection) {
    var lines = SDPUtils.splitLines(mediaSection);
    var mline = lines[0].split(' ');
    return mline[0].substr(2);
  };
  
  SDPUtils.isRejected = function(mediaSection) {
    return mediaSection.split(' ', 2)[1] === '0';
  };
  
  // Expose public methods.
  module.exports = SDPUtils;
  
  },{}],2:[function(require,module,exports){
  (function (global){
  /*
   *  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 adapterFactory = require('./adapter_factory.js');
  module.exports = adapterFactory({window: global.window});
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"./adapter_factory.js":3}],3:[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.
  module.exports = function(dependencies) {
    var window = dependencies && dependencies.window;
  
    // Utils.
    var utils = require('./utils');
    var logging = utils.log;
    var browserDetails = utils.detectBrowser(window);
  
    // Export to the adapter global object visible in the browser.
    var adapter = {
      browserDetails: browserDetails,
      extractVersion: utils.extractVersion,
      disableLog: 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 'chrome':
        if (!chromeShim || !chromeShim.shimPeerConnection) {
          logging('Chrome shim is not included in this adapter release.');
          return adapter;
        }
        logging('adapter.js shimming chrome.');
        // Export to the adapter global object visible in the browser.
        adapter.browserShim = chromeShim;
  
        chromeShim.shimGetUserMedia(window);
        chromeShim.shimMediaStream(window);
        utils.shimCreateObjectURL(window);
        chromeShim.shimSourceObject(window);
        chromeShim.shimPeerConnection(window);
        chromeShim.shimOnTrack(window);
        chromeShim.shimGetSendersWithDtmf(window);
        break;
      case 'firefox':
        if (!firefoxShim || !firefoxShim.shimPeerConnection) {
          logging('Firefox shim is not included in this adapter release.');
          return adapter;
        }
        logging('adapter.js shimming firefox.');
        // Export to the adapter global object visible in the browser.
        adapter.browserShim = firefoxShim;
  
        firefoxShim.shimGetUserMedia(window);
        utils.shimCreateObjectURL(window);
        firefoxShim.shimSourceObject(window);
        firefoxShim.shimPeerConnection(window);
        firefoxShim.shimOnTrack(window);
        break;
      case 'edge':
        if (!edgeShim || !edgeShim.shimPeerConnection) {
          logging('MS edge shim is not included in this adapter release.');
          return adapter;
        }
        logging('adapter.js shimming edge.');
        // Export to the adapter global object visible in the browser.
        adapter.browserShim = edgeShim;
  
        edgeShim.shimGetUserMedia(window);
        utils.shimCreateObjectURL(window);
        edgeShim.shimPeerConnection(window);
        edgeShim.shimReplaceTrack(window);
        break;
      case 'safari':
        if (!safariShim) {
          logging('Safari shim is not included in this adapter release.');
          return adapter;
        }
        logging('adapter.js shimming safari.');
        // Export to the adapter global object visible in the browser.
        adapter.browserShim = safariShim;
  
        safariShim.shimCallbacksAPI(window);
        safariShim.shimAddStream(window);
        safariShim.shimOnAddStream(window);
        safariShim.shimGetUserMedia(window);
        break;
      default:
        logging('Unsupported browser!');
        break;
    }
  
    return adapter;
  };
  
  },{"./chrome/chrome_shim":4,"./edge/edge_shim":6,"./firefox/firefox_shim":9,"./safari/safari_shim":11,"./utils":12}],4:[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 utils = require('../utils.js');
  var logging = utils.log;
  
  var chromeShim = {
    shimMediaStream: function(window) {
      window.MediaStream = window.MediaStream || window.webkitMediaStream;
    },
  
    shimOnTrack: function(window) {
      if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
          window.RTCPeerConnection.prototype)) {
        Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
          get: function() {
            return this._ontrack;
          },
          set: function(f) {
            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 receiver;
                if (window.RTCPeerConnection.prototype.getReceivers) {
                  receiver = self.getReceivers().find(function(r) {
                    return r.track.id === te.track.id;
                  });
                } else {
                  receiver = {track: te.track};
                }
  
                var event = new Event('track');
                event.track = te.track;
                event.receiver = receiver;
                event.streams = [e.stream];
                self.dispatchEvent(event);
              });
              e.stream.getTracks().forEach(function(track) {
                var receiver;
                if (window.RTCPeerConnection.prototype.getReceivers) {
                  receiver = self.getReceivers().find(function(r) {
                    return r.track.id === track.id;
                  });
                } else {
                  receiver = {track: track};
                }
                var event = new Event('track');
                event.track = track;
                event.receiver = receiver;
                event.streams = [e.stream];
                this.dispatchEvent(event);
              }.bind(this));
            }.bind(this));
          }
        });
      }
    },
  
    shimGetSendersWithDtmf: function(window) {
      if (typeof window === 'object' && window.RTCPeerConnection &&
          !('getSenders' in window.RTCPeerConnection.prototype) &&
          'createDTMFSender' in window.RTCPeerConnection.prototype) {
        window.RTCPeerConnection.prototype.getSenders = function() {
          return this._senders || [];
        };
        var origAddStream = window.RTCPeerConnection.prototype.addStream;
        var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
  
        if (!window.RTCPeerConnection.prototype.addTrack) {
          window.RTCPeerConnection.prototype.addTrack = function(track, stream) {
            var pc = this;
            if (pc.signalingState === 'closed') {
              throw new DOMException(
                'The RTCPeerConnection\'s signalingState is \'closed\'.',
                'InvalidStateError');
            }
            var streams = [].slice.call(arguments, 1);
            if (streams.length !== 1 ||
                !streams[0].getTracks().find(function(t) {
                  return t === track;
                })) {
              // this is not fully correct but all we can manage without
              // [[associated MediaStreams]] internal slot.
              throw new DOMException(
                'The adapter.js addTrack polyfill only supports a single ' +
                ' stream which is associated with the specified track.',
                'NotSupportedError');
            }
  
            pc._senders = pc._senders || [];
            var alreadyExists = pc._senders.find(function(t) {
              return t.track === track;
            });
            if (alreadyExists) {
              throw new DOMException('Track already exists.',
                  'InvalidAccessError');
            }
  
            pc._streams = pc._streams || {};
            var oldStream = pc._streams[stream.id];
            if (oldStream) {
              oldStream.addTrack(track);
              pc.removeStream(oldStream);
              pc.addStream(oldStream);
            } else {
              var newStream = new window.MediaStream([track]);
              pc._streams[stream.id] = newStream;
              pc.addStream(newStream);
            }
  
            var sender = {
              track: track,
              get dtmf() {
                if (this._dtmf === undefined) {
                  if (track.kind === 'audio') {
                    this._dtmf = pc.createDTMFSender(track);
                  } else {
                    this._dtmf = null;
                  }
                }
                return this._dtmf;
              }
            };
            pc._senders.push(sender);
            return sender;
          };
        }
        window.RTCPeerConnection.prototype.addStream = function(stream) {
          var pc = this;
          pc._senders = pc._senders || [];
          origAddStream.apply(pc, [stream]);
          stream.getTracks().forEach(function(track) {
            pc._senders.push({
              track: track,
              get dtmf() {
                if (this._dtmf === undefined) {
                  if (track.kind === 'audio') {
                    this._dtmf = pc.createDTMFSender(track);
                  } else {
                    this._dtmf = null;
                  }
                }
                return this._dtmf;
              }
            });
          });
        };
  
        window.RTCPeerConnection.prototype.removeStream = function(stream) {
          var pc = this;
          pc._senders = pc._senders || [];
          origRemoveStream.apply(pc, [stream]);
          stream.getTracks().forEach(function(track) {
            var sender = pc._senders.find(function(s) {
              return s.track === track;
            });
            if (sender) {
              pc._senders.splice(pc._senders.indexOf(sender), 1); // remove sender
            }
          });
        };
      }
    },
  
    shimSourceObject: function(window) {
      var URL = window && window.URL;
  
      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 undefined;
              }
              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(window) {
      var browserDetails = utils.detectBrowser(window);
  
      // The RTCPeerConnection object.
      if (!window.RTCPeerConnection) {
        window.RTCPeerConnection = function(pcConfig, pcConstraints) {
          // Translate iceTransportPolicy to iceTransports,
          // see https://code.google.com/p/webrtc/issues/detail?id=4869
          // this was fixed in M56 along with unprefixing RTCPeerConnection.
          logging('PeerConnection');
          if (pcConfig && pcConfig.iceTransportPolicy) {
            pcConfig.iceTransports = pcConfig.iceTransportPolicy;
          }
  
          return new window.webkitRTCPeerConnection(pcConfig, pcConstraints);
        };
        window.RTCPeerConnection.prototype =
            window.webkitRTCPeerConnection.prototype;
        // wrap static methods. Currently just generateCertificate.
        if (window.webkitRTCPeerConnection.generateCertificate) {
          Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
            get: function() {
              return window.webkitRTCPeerConnection.generateCertificate;
            }
          });
        }
      } else {
        // migrate from non-spec RTCIceServer.url to RTCIceServer.urls
        var OrigPeerConnection = window.RTCPeerConnection;
        window.RTCPeerConnection = function(pcConfig, pcConstraints) {
          if (pcConfig && pcConfig.iceServers) {
            var newIceServers = [];
            for (var i = 0; i < pcConfig.iceServers.length; i++) {
              var server = pcConfig.iceServers[i];
              if (!server.hasOwnProperty('urls') &&
                  server.hasOwnProperty('url')) {
                console.warn('RTCIceServer.url is deprecated! Use urls instead.');
                server = JSON.parse(JSON.stringify(server));
                server.urls = server.url;
                newIceServers.push(server);
              } else {
                newIceServers.push(pcConfig.iceServers[i]);
              }
            }
            pcConfig.iceServers = newIceServers;
          }
          return new OrigPeerConnection(pcConfig, pcConstraints);
        };
        window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;
        // wrap static methods. Currently just generateCertificate.
        Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
          get: function() {
            return OrigPeerConnection.generateCertificate;
          }
        });
      }
  
      var origGetStats = window.RTCPeerConnection.prototype.getStats;
      window.RTCPeerConnection.prototype.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.apply(this, arguments);
        }
  
        // When spec-style getStats is supported, return those when called with
        // either no arguments or the selector argument is null.
        if (origGetStats.length === 0 && (arguments.length === 0 ||
            typeof arguments[0] !== 'function')) {
          return origGetStats.apply(this, []);
        }
  
        var fixChromeStats_ = function(response) {
          var standardReport = {};
          var reports = response.result();
          reports.forEach(function(report) {
            var standardStats = {
              id: report.id,
              timestamp: report.timestamp,
              type: {
                localcandidate: 'local-candidate',
                remotecandidate: 'remote-candidate'
              }[report.type] || report.type
            };
            report.names().forEach(function(name) {
              standardStats[name] = report.stat(name);
            });
            standardReport[standardStats.id] = standardStats;
          });
  
          return standardReport;
        };
  
        // shim getStats with maplike support
        var makeMapStats = function(stats) {
          return new Map(Object.keys(stats).map(function(key) {
            return [key, stats[key]];
          }));
        };
  
        if (arguments.length >= 2) {
          var successCallbackWrapper_ = function(response) {
            args[1](makeMapStats(fixChromeStats_(response)));
          };
  
          return origGetStats.apply(this, [successCallbackWrapper_,
            arguments[0]]);
        }
  
        // promise-support
        return new Promise(function(resolve, reject) {
          origGetStats.apply(self, [
            function(response) {
              resolve(makeMapStats(fixChromeStats_(response)));
            }, reject]);
        }).then(successCallback, errorCallback);
      };
  
      // add promise support -- natively available in Chrome 51
      if (browserDetails.version < 51) {
        ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
            .forEach(function(method) {
              var nativeMethod = window.RTCPeerConnection.prototype[method];
              window.RTCPeerConnection.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]);
                  }
                });
              };
            });
      }
  
      // promise support for createOffer and createAnswer. Available (without
      // bugs) since M52: crbug/619289
      if (browserDetails.version < 52) {
        ['createOffer', 'createAnswer'].forEach(function(method) {
          var nativeMethod = window.RTCPeerConnection.prototype[method];
          window.RTCPeerConnection.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);
          };
        });
      }
  
      // shim implicit creation of RTCSessionDescription/RTCIceCandidate
      ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
          .forEach(function(method) {
            var nativeMethod = window.RTCPeerConnection.prototype[method];
            window.RTCPeerConnection.prototype[method] = function() {
              arguments[0] = new ((method === 'addIceCandidate') ?
                  window.RTCIceCandidate :
                  window.RTCSessionDescription)(arguments[0]);
              return nativeMethod.apply(this, arguments);
            };
          });
  
      // support for addIceCandidate(null or undefined)
      var nativeAddIceCandidate =
          window.RTCPeerConnection.prototype.addIceCandidate;
      window.RTCPeerConnection.prototype.addIceCandidate = function() {
        if (!arguments[0]) {
          if (arguments[1]) {
            arguments[1].apply(null);
          }
          return Promise.resolve();
        }
        return nativeAddIceCandidate.apply(this, arguments);
      };
    }
  };
  
  
  // Expose public methods.
  module.exports = {
    shimMediaStream: chromeShim.shimMediaStream,
    shimOnTrack: chromeShim.shimOnTrack,
    shimGetSendersWithDtmf: chromeShim.shimGetSendersWithDtmf,
    shimSourceObject: chromeShim.shimSourceObject,
    shimPeerConnection: chromeShim.shimPeerConnection,
    shimGetUserMedia: require('./getusermedia')
  };
  
  },{"../utils.js":12,"./getusermedia":5}],5:[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 utils = require('../utils.js');
  var logging = utils.log;
  
  // Expose public methods.
  module.exports = function(window) {
    var browserDetails = utils.detectBrowser(window);
    var navigator = window && window.navigator;
  
    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 && typeof constraints.audio === 'object') {
        var remap = function(obj, a, b) {
          if (a in obj && !(b in obj)) {
            obj[b] = obj[a];
            delete obj[a];
          }
        };
        constraints = JSON.parse(JSON.stringify(constraints));
        remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');
        remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');
        constraints.audio = constraintsToChrome_(constraints.audio);
      }
      if (constraints && typeof constraints.video === 'object') {
        // Shim facingMode for mobile & surface pro.
        var face = constraints.video.facingMode;
        face = face && ((typeof face === 'object') ? face : {ideal: face});
        var getSupportedFacingModeLies = browserDetails.version < 61;
  
        if ((face && (face.exact === 'user' || face.exact === 'environment' ||
                      face.ideal === 'user' || face.ideal === 'environment')) &&
            !(navigator.mediaDevices.getSupportedConstraints &&
              navigator.mediaDevices.getSupportedConstraints().facingMode &&
              !getSupportedFacingModeLies)) {
          delete constraints.video.facingMode;
          var matches;
          if (face.exact === 'environment' || face.ideal === 'environment') {
            matches = ['back', 'rear'];
          } else if (face.exact === 'user' || face.ideal === 'user') {
            matches = ['front'];
          }
          if (matches) {
            // Look for matches in label, or use last cam for back (typical).
            return navigator.mediaDevices.enumerateDevices()
            .then(function(devices) {
              devices = devices.filter(function(d) {
                return d.kind === 'videoinput';
              });
              var dev = devices.find(function(d) {
                return matches.some(function(match) {
                  return d.label.toLowerCase().indexOf(match) !== -1;
                });
              });
              if (!dev && devices.length && matches.indexOf('back') !== -1) {
                dev = devices[devices.length - 1]; // more likely the back cam
              }
              if (dev) {
                constraints.video.deviceId = face.exact ? {exact: dev.deviceId} :
                                                          {ideal: dev.deviceId};
              }
              constraints.video = constraintsToChrome_(constraints.video);
              logging('chrome: ' + JSON.stringify(constraints));
              return func(constraints);
            });
          }
        }
        constraints.video = constraintsToChrome_(constraints.video);
      }
      logging('chrome: ' + JSON.stringify(constraints));
      return func(constraints);
    };
  
    var shimError_ = function(e) {
      return {
        name: {
          PermissionDeniedError: 'NotAllowedError',
          InvalidStateError: 'NotReadableError',
          DevicesNotFoundError: 'NotFoundError',
          ConstraintNotSatisfiedError: 'OverconstrainedError',
          TrackStartError: 'NotReadableError',
          MediaDeviceFailedDueToShutdown: 'NotReadableError',
          MediaDeviceKillSwitchOn: 'NotReadableError'
        }[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 window.MediaStreamTrack.getSources(function(devices) {
              resolve(devices.map(function(device) {
                return {label: device.label,
                  kind: kinds[device.kind],
                  deviceId: device.id,
                  groupId: ''};
              }));
            });
          });
        },
        getSupportedConstraints: function() {
          return {
            deviceId: true, echoCancellation: true, facingMode: true,
            frameRate: true, height: true, width: true
          };
        }
      };
    }
  
    // 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).then(function(stream) {
            if (c.audio && !stream.getAudioTracks().length ||
                c.video && !stream.getVideoTracks().length) {
              stream.getTracks().forEach(function(track) {
                track.stop();
              });
              throw new DOMException('', 'NotFoundError');
            }
            return stream;
          }, function(e) {
            return Promise.reject(shimError_(e));
          });
        });
      };
    }
  
    // 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":12}],6:[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 utils = require('../utils');
  var shimRTCPeerConnection = require('./rtcpeerconnection_shim');
  
  module.exports = {
    shimGetUserMedia: require('./getusermedia'),
    shimPeerConnection: function(window) {
      var browserDetails = utils.detectBrowser(window);
  
      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;
          };
        }
        // this adds an additional event listener to MediaStrackTrack that signals
        // when a tracks enabled property was changed. Workaround for a bug in
        // addStream, see below. No longer required in 15025+
        if (browserDetails.version < 15025) {
          var origMSTEnabled = Object.getOwnPropertyDescriptor(
              window.MediaStreamTrack.prototype, 'enabled');
          Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {
            set: function(value) {
              origMSTEnabled.set.call(this, value);
              var ev = new Event('enabled');
              ev.enabled = value;
              this.dispatchEvent(ev);
            }
          });
        }
      }
      window.RTCPeerConnection =
          shimRTCPeerConnection(window, browserDetails.version);
    },
    shimReplaceTrack: function(window) {
      // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614
      if (window.RTCRtpSender &&
          !('replaceTrack' in window.RTCRtpSender.prototype)) {
        window.RTCRtpSender.prototype.replaceTrack =
            window.RTCRtpSender.prototype.setTrack;
      }
    }
  };
  
  },{"../utils":12,"./getusermedia":7,"./rtcpeerconnection_shim":8}],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';
  
  // Expose public methods.
  module.exports = function(window) {
    var navigator = window && window.navigator;
  
    var shimError_ = function(e) {
      return {
        name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,
        message: e.message,
        constraint: e.constraint,
        toString: function() {
          return this.name;
        }
      };
    };
  
    // getUserMedia error shim.
    var origGetUserMedia = navigator.mediaDevices.getUserMedia.
        bind(navigator.mediaDevices);
    navigator.mediaDevices.getUserMedia = function(c) {
      return origGetUserMedia(c).catch(function(e) {
        return Promise.reject(shimError_(e));
      });
    };
  };
  
  },{}],8:[function(require,module,exports){
  /*
   *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree.
   */
   /* eslint-env node */
  'use strict';
  
  var SDPUtils = require('sdp');
  
  // sort tracks such that they follow an a-v-a-v...
  // pattern.
  function sortTracks(tracks) {
    var audioTracks = tracks.filter(function(track) {
      return track.kind === 'audio';
    });
    var videoTracks = tracks.filter(function(track) {
      return track.kind === 'video';
    });
    tracks = [];
    while (audioTracks.length || videoTracks.length) {
      if (audioTracks.length) {
        tracks.push(audioTracks.shift());
      }
      if (videoTracks.length) {
        tracks.push(videoTracks.shift());
      }
    }
    return tracks;
  }
  
  // Edge does not like
  // 1) stun:
  // 2) turn: that does not have all of turn:host:port?transport=udp
  // 3) turn: with ipv6 addresses
  // 4) turn: occurring muliple times
  function filterIceServers(iceServers, edgeVersion) {
    var hasTurn = false;
    iceServers = JSON.parse(JSON.stringify(iceServers));
    return iceServers.filter(function(server) {
      if (server && (server.urls || server.url)) {
        var urls = server.urls || server.url;
        if (server.url && !server.urls) {
          console.warn('RTCIceServer.url is deprecated! Use urls instead.');
        }
        var isString = typeof urls === 'string';
        if (isString) {
          urls = [urls];
        }
        urls = urls.filter(function(url) {
          var validTurn = url.indexOf('turn:') === 0 &&
              url.indexOf('transport=udp') !== -1 &&
              url.indexOf('turn:[') === -1 &&
              !hasTurn;
  
          if (validTurn) {
            hasTurn = true;
            return true;
          }
          return url.indexOf('stun:') === 0 && edgeVersion >= 14393;
        });
  
        delete server.url;
        server.urls = isString ? urls[0] : urls;
        return !!urls.length;
      }
      return false;
    });
  }
  
  // Determines the intersection of local and remote capabilities.
  function getCommonCapabilities(localCapabilities, remoteCapabilities) {
    var commonCapabilities = {
      codecs: [],
      headerExtensions: [],
      fecMechanisms: []
    };
  
    var findCodecByPayloadType = function(pt, codecs) {
      pt = parseInt(pt, 10);
      for (var i = 0; i < codecs.length; i++) {
        if (codecs[i].payloadType === pt ||
            codecs[i].preferredPayloadType === pt) {
          return codecs[i];
        }
      }
    };
  
    var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {
      var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);
      var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);
      return lCodec && rCodec &&
          lCodec.name.toLowerCase() === rCodec.name.toLowerCase();
    };
  
    localCapabilities.codecs.forEach(function(lCodec) {
      for (var i = 0; i < remoteCapabilities.codecs.length; i++) {
        var rCodec = remoteCapabilities.codecs[i];
        if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&
            lCodec.clockRate === rCodec.clockRate) {
          if (lCodec.name.toLowerCase() === 'rtx' &&
              lCodec.parameters && rCodec.parameters.apt) {
            // for RTX we need to find the local rtx that has a apt
            // which points to the same local codec as the remote one.
            if (!rtxCapabilityMatches(lCodec, rCodec,
                localCapabilities.codecs, remoteCapabilities.codecs)) {
              continue;
            }
          }
          rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy
          // number of channels is the highest common number of channels
          rCodec.numChannels = Math.min(lCodec.numChannels,
              rCodec.numChannels);
          // push rCodec so we reply with offerer payload type
          commonCapabilities.codecs.push(rCodec);
  
          // determine common feedback mechanisms
          rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {
            for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {
              if (lCodec.rtcpFeedback[j].type === fb.type &&
                  lCodec.rtcpFeedback[j].parameter === fb.parameter) {
                return true;
              }
            }
            return false;
          });
          // FIXME: also need to determine .parameters
          //  see https://github.com/openpeer/ortc/issues/569
          break;
        }
      }
    });
  
    localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {
      for (var i = 0; i < remoteCapabilities.headerExtensions.length;
           i++) {
        var rHeaderExtension = remoteCapabilities.headerExtensions[i];
        if (lHeaderExtension.uri === rHeaderExtension.uri) {
          commonCapabilities.headerExtensions.push(rHeaderExtension);
          break;
        }
      }
    });
  
    // FIXME: fecMechanisms
    return commonCapabilities;
  }
  
  // is action=setLocalDescription with type allowed in signalingState
  function isActionAllowedInSignalingState(action, type, signalingState) {
    return {
      offer: {
        setLocalDescription: ['stable', 'have-local-offer'],
        setRemoteDescription: ['stable', 'have-remote-offer']
      },
      answer: {
        setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],
        setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']
      }
    }[type][action].indexOf(signalingState) !== -1;
  }
  
  module.exports = function(window, edgeVersion) {
    var RTCPeerConnection = function(config) {
      var self = this;
  
      var _eventTarget = document.createDocumentFragment();
      ['addEventListener', 'removeEventListener', 'dispatchEvent']
          .forEach(function(method) {
            self[method] = _eventTarget[method].bind(_eventTarget);
          });
  
      this.needNegotiation = false;
  
      this.onicecandidate = null;
      this.onaddstream = null;
      this.ontrack = null;
      this.onremovestream = null;
      this.onsignalingstatechange = null;
      this.oniceconnectionstatechange = null;
      this.onicegatheringstatechange = null;
      this.onnegotiationneeded = null;
      this.ondatachannel = null;
      this.canTrickleIceCandidates = null;
  
      this.localStreams = [];
      this.remoteStreams = [];
      this.getLocalStreams = function() {
        return self.localStreams;
      };
      this.getRemoteStreams = function() {
        return self.remoteStreams;
      };
  
      this.localDescription = new window.RTCSessionDescription({
        type: '',
        sdp: ''
      });
      this.remoteDescription = new window.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;
          default:
            // don't set iceTransportPolicy.
            break;
        }
      }
      this.usingBundle = config && config.bundlePolicy === 'max-bundle';
  
      if (config && config.iceServers) {
        this.iceOptions.iceServers = filterIceServers(config.iceServers,
            edgeVersion);
      }
      this._config = config || {};
  
      // 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 = [];
    };
  
    RTCPeerConnection.prototype._emitGatheringStateChange = function() {
      var event = new Event('icegatheringstatechange');
      this.dispatchEvent(event);
      if (this.onicegatheringstatechange !== null) {
        this.onicegatheringstatechange(event);
      }
    };
  
    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 {
          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.iceGatheringStateChange !== 'complete') {
            self.iceGatheringState = 'complete';
            self._emitGatheringStateChange();
          }
        }
      });
      this._localIceCandidatesBuffer = [];
    };
  
    RTCPeerConnection.prototype.getConfiguration = function() {
      return this._config;
    };
  
    // internal helper to create a transceiver object.
    // (whih is not yet the same as the WebRTC 1.0 transceiver)
    RTCPeerConnection.prototype._createTransceiver = function(kind) {
      var hasBundleTransport = this.transceivers.length > 0;
      var transceiver = {
        track: null,
        iceGatherer: null,
        iceTransport: null,
        dtlsTransport: null,
        localCapabilities: null,
        remoteCapabilities: null,
        rtpSender: null,
        rtpReceiver: null,
        kind: kind,
        mid: null,
        sendEncodingParameters: null,
        recvEncodingParameters: null,
        stream: null,
        wantReceive: true
      };
      if (this.usingBundle && hasBundleTransport) {
        transceiver.iceTransport = this.transceivers[0].iceTransport;
        transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;
      } else {
        var transports = this._createIceAndDtlsTransports();
        transceiver.iceTransport = transports.iceTransport;
        transceiver.dtlsTransport = transports.dtlsTransport;
      }
      this.transceivers.push(transceiver);
      return transceiver;
    };
  
    RTCPeerConnection.prototype.addTrack = function(track, stream) {
      var transceiver;
      for (var i = 0; i < this.transceivers.length; i++) {
        if (!this.transceivers[i].track &&
            this.transceivers[i].kind === track.kind) {
          transceiver = this.transceivers[i];
        }
      }
      if (!transceiver) {
        transceiver = this._createTransceiver(track.kind);
      }
  
      transceiver.track = track;
      transceiver.stream = stream;
      transceiver.rtpSender = new window.RTCRtpSender(track,
          transceiver.dtlsTransport);
  
      this._maybeFireNegotiationNeeded();
      return transceiver.rtpSender;
    };
  
    RTCPeerConnection.prototype.addStream = function(stream) {
      var self = this;
      if (edgeVersion >= 15025) {
        this.localStreams.push(stream);
        stream.getTracks().forEach(function(track) {
          self.addTrack(track, stream);
        });
      } else {
        // Clone is necessary for local demos mostly, attaching directly
        // to two different senders does not work (build 10547).
        // Fixed in 15025 (or earlier)
        var clonedStream = stream.clone();
        stream.getTracks().forEach(function(track, idx) {
          var clonedTrack = clonedStream.getTracks()[idx];
          track.addEventListener('enabled', function(event) {
            clonedTrack.enabled = event.enabled;
          });
        });
        clonedStream.getTracks().forEach(function(track) {
          self.addTrack(track, clonedStream);
        });
        this.localStreams.push(clonedStream);
      }
      this._maybeFireNegotiationNeeded();
    };
  
    RTCPeerConnection.prototype.removeStream = function(stream) {
      var idx = this.localStreams.indexOf(stream);
      if (idx > -1) {
        this.localStreams.splice(idx, 1);
        this._maybeFireNegotiationNeeded();
      }
    };
  
    RTCPeerConnection.prototype.getSenders = function() {
      return this.transceivers.filter(function(transceiver) {
        return !!transceiver.rtpSender;
      })
      .map(function(transceiver) {
        return transceiver.rtpSender;
      });
    };
  
    RTCPeerConnection.prototype.getReceivers = function() {
      return this.transceivers.filter(function(transceiver) {
        return !!transceiver.rtpReceiver;
      })
      .map(function(transceiver) {
        return transceiver.rtpReceiver;
      });
    };
  
    // Create ICE gatherer and hook it up.
    RTCPeerConnection.prototype._createIceGatherer = function(mid,
        sdpMLineIndex) {
      var self = this;
      var iceGatherer = new window.RTCIceGatherer(self.iceOptions);
      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';
          }
        } else {
          // RTCIceCandidate doesn't have a component, needs to be added
          cand.component = 1;
          event.candidate.candidate = SDPUtils.writeCandidate(cand);
        }
  
        // update local description.
        var sections = SDPUtils.splitSections(self.localDescription.sdp);
        if (!end) {
          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 transceivers = self._pendingOffer ? self._pendingOffer :
            self.transceivers;
        var complete = 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':
            if (!end) {
              self._localIceCandidatesBuffer.push(event);
            }
            if (end && complete) {
              self._localIceCandidatesBuffer.push(
                  new Event('icecandidate'));
            }
            break;
          case 'gathering':
            self._emitBufferedCandidates();
            if (!end) {
              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';
              self._emitGatheringStateChange();
            }
            break;
          case 'complete':
            // should not happen... currently!
            break;
          default: // no-op.
            break;
        }
      };
      return iceGatherer;
    };
  
    // Create ICE transport and DTLS transport.
    RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {
      var self = this;
      var iceTransport = new window.RTCIceTransport(null);
      iceTransport.onicestatechange = function() {
        self._updateConnectionState();
      };
  
      var dtlsTransport = new window.RTCDtlsTransport(iceTransport);
      dtlsTransport.ondtlsstatechange = function() {
        self._updateConnectionState();
      };
      dtlsTransport.onerror = function() {
        // onerror does not set state to failed by itself.
        Object.defineProperty(dtlsTransport, 'state',
            {value: 'failed', writable: true});
        self._updateConnectionState();
      };
  
      return {
        iceTransport: iceTransport,
        dtlsTransport: dtlsTransport
      };
    };
  
    // Destroy ICE gatherer, ICE transport and DTLS transport.
    // Without triggering the callbacks.
    RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(
        sdpMLineIndex) {
      var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
      if (iceGatherer) {
        delete iceGatherer.onlocalcandidate;
        delete this.transceivers[sdpMLineIndex].iceGatherer;
      }
      var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;
      if (iceTransport) {
        delete iceTransport.onicestatechange;
        delete this.transceivers[sdpMLineIndex].iceTransport;
      }
      var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;
      if (dtlsTransport) {
        delete dtlsTransport.ondtlssttatechange;
        delete dtlsTransport.onerror;
        delete this.transceivers[sdpMLineIndex].dtlsTransport;
      }
    };
  
    // Start the RTP Sender and Receiver for a transceiver.
    RTCPeerConnection.prototype._transceive = function(transceiver,
        send, recv) {
      var params = getCommonCapabilities(transceiver.localCapabilities,
          transceiver.remoteCapabilities);
      if (send && transceiver.rtpSender) {
        params.encodings = transceiver.sendEncodingParameters;
        params.rtcp = {
          cname: SDPUtils.localCName,
          compound: transceiver.rtcpParameters.compound
        };
        if (transceiver.recvEncodingParameters.length) {
          params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;
        }
        transceiver.rtpSender.send(params);
      }
      if (recv && transceiver.rtpReceiver) {
        // remove RTX field in Edge 14942
        if (transceiver.kind === 'video'
            && transceiver.recvEncodingParameters
            && edgeVersion < 15019) {
          transceiver.recvEncodingParameters.forEach(function(p) {
            delete p.rtx;
          });
        }
        params.encodings = transceiver.recvEncodingParameters;
        params.rtcp = {
          cname: transceiver.rtcpParameters.cname,
          compound: transceiver.rtcpParameters.compound
        };
        if (transceiver.sendEncodingParameters.length) {
          params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;
        }
        transceiver.rtpReceiver.receive(params);
      }
    };
  
    RTCPeerConnection.prototype.setLocalDescription = function(description) {
      var self = this;
  
      if (!isActionAllowedInSignalingState('setLocalDescription',
          description.type, this.signalingState)) {
        var e = new Error('Can not set local ' + description.type +
            ' in state ' + this.signalingState);
        e.name = 'InvalidStateError';
        if (arguments.length > 2 && typeof arguments[2] === 'function') {
          window.setTimeout(arguments[2], 0, e);
        }
        return Promise.reject(e);
      }
  
      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 = SDPUtils.isRejected(mediaSection);
  
          if (!rejected && !transceiver.isDatachannel) {
            var remoteIceParameters = SDPUtils.getIceParameters(
                mediaSection, sessionpart);
            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 = 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._emitGatheringStateChange();
          }
          self._emitBufferedCandidates();
        }, 0);
      }
      var p = Promise.resolve();
      p.then(function() {
        if (!hasCallback) {
          if (self.iceGatheringState === 'new') {
            self.iceGatheringState = 'gathering';
            self._emitGatheringStateChange();
          }
          // Usually candidates will be emitted earlier.
          window.setTimeout(self._emitBufferedCandidates.bind(self), 500);
        }
      });
      return p;
    };
  
    RTCPeerConnection.prototype.setRemoteDescription = function(description) {
      var self = this;
  
      if (!isActionAllowedInSignalingState('setRemoteDescription',
          description.type, this.signalingState)) {
        var e = new Error('Can not set remote ' + description.type +
            ' in state ' + this.signalingState);
        e.name = 'InvalidStateError';
        if (arguments.length > 2 && typeof arguments[2] === 'function') {
          window.setTimeout(arguments[2], 0, e);
        }
        return Promise.reject(e);
      }
  
      var streams = {};
      var receiverList = [];
      var sections = SDPUtils.splitSections(description.sdp);
      var sessionpart = sections.shift();
      var isIceLite = SDPUtils.matchPrefix(sessionpart,
          'a=ice-lite').length > 0;
      var usingBundle = SDPUtils.matchPrefix(sessionpart,
          'a=group:BUNDLE ').length > 0;
      this.usingBundle = usingBundle;
      var iceOptions = SDPUtils.matchPrefix(sessionpart,
          'a=ice-options:')[0];
      if (iceOptions) {
        this.canTrickleIceCandidates = iceOptions.substr(14).split(' ')
            .indexOf('trickle') >= 0;
      } else {
        this.canTrickleIceCandidates = false;
      }
  
      sections.forEach(function(mediaSection, sdpMLineIndex) {
        var lines = SDPUtils.splitLines(mediaSection);
        var kind = SDPUtils.getKind(mediaSection);
        var rejected = SDPUtils.isRejected(mediaSection);
        var protocol = lines[0].substr(2).split(' ')[2];
  
        var direction = SDPUtils.getDirection(mediaSection, sessionpart);
        var remoteMsid = SDPUtils.parseMsid(mediaSection);
  
        var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();
  
        // Reject datachannels which are not implemented yet.
        if (kind === 'application' && protocol === 'DTLS/SCTP') {
          self.transceivers[sdpMLineIndex] = {
            mid: mid,
            isDatachannel: true
          };
          return;
        }
  
        var transceiver;
        var iceGatherer;
        var iceTransport;
        var dtlsTransport;
        var rtpReceiver;
        var sendEncodingParameters;
        var recvEncodingParameters;
        var localCapabilities;
  
        var track;
        // FIXME: ensure the mediaSection has rtcp-mux set.
        var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
        var remoteIceParameters;
        var remoteDtlsParameters;
        if (!rejected) {
          remoteIceParameters = SDPUtils.getIceParameters(mediaSection,
              sessionpart);
          remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,
              sessionpart);
          remoteDtlsParameters.role = 'client';
        }
        recvEncodingParameters =
            SDPUtils.parseRtpEncodingParameters(mediaSection);
  
        var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);
  
        var isComplete = SDPUtils.matchPrefix(mediaSection,
            'a=end-of-candidates', sessionpart).length > 0;
        var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')
            .map(function(cand) {
              return SDPUtils.parseCandidate(cand);
            })
            .filter(function(cand) {
              return cand.component === '1' || cand.component === 1;
            });
  
        // Check if we can use BUNDLE and dispose transports.
        if ((description.type === 'offer' || description.type === 'answer') &&
            !rejected && usingBundle && sdpMLineIndex > 0 &&
            self.transceivers[sdpMLineIndex]) {
          self._disposeIceAndDtlsTransports(sdpMLineIndex);
          self.transceivers[sdpMLineIndex].iceGatherer =
              self.transceivers[0].iceGatherer;
          self.transceivers[sdpMLineIndex].iceTransport =
              self.transceivers[0].iceTransport;
          self.transceivers[sdpMLineIndex].dtlsTransport =
              self.transceivers[0].dtlsTransport;
          if (self.transceivers[sdpMLineIndex].rtpSender) {
            self.transceivers[sdpMLineIndex].rtpSender.setTransport(
                self.transceivers[0].dtlsTransport);
          }
          if (self.transceivers[sdpMLineIndex].rtpReceiver) {
            self.transceivers[sdpMLineIndex].rtpReceiver.setTransport(
                self.transceivers[0].dtlsTransport);
          }
        }
        if (description.type === 'offer' && !rejected) {
          transceiver = self.transceivers[sdpMLineIndex] ||
              self._createTransceiver(kind);
          transceiver.mid = mid;
  
          if (!transceiver.iceGatherer) {
            transceiver.iceGatherer = usingBundle && sdpMLineIndex > 0 ?
                self.transceivers[0].iceGatherer :
                self._createIceGatherer(mid, sdpMLineIndex);
          }
  
          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {
            transceiver.iceTransport.setRemoteCandidates(cands);
          }
  
          localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);
  
          // filter RTX until additional stuff needed for RTX is implemented
          // in adapter.js
          if (edgeVersion < 15019) {
            localCapabilities.codecs = localCapabilities.codecs.filter(
                function(codec) {
                  return codec.name !== 'rtx';
                });
          }
  
          sendEncodingParameters = [{
            ssrc: (2 * sdpMLineIndex + 2) * 1001
          }];
  
          if (direction === 'sendrecv' || direction === 'sendonly') {
            rtpReceiver = new window.RTCRtpReceiver(transceiver.dtlsTransport,
                kind);
  
            track = rtpReceiver.track;
            // FIXME: does not work with Plan B.
            if (remoteMsid) {
              if (!streams[remoteMsid.stream]) {
                streams[remoteMsid.stream] = new window.MediaStream();
                Object.defineProperty(streams[remoteMsid.stream], 'id', {
                  get: function() {
                    return remoteMsid.stream;
                  }
                });
              }
              Object.defineProperty(track, 'id', {
                get: function() {
                  return remoteMsid.track;
                }
              });
              streams[remoteMsid.stream].addTrack(track);
              receiverList.push([track, rtpReceiver,
                streams[remoteMsid.stream]]);
            } else {
              if (!streams.default) {
                streams.default = new window.MediaStream();
              }
              streams.default.addTrack(track);
              receiverList.push([track, rtpReceiver, streams.default]);
            }
          }
  
          transceiver.localCapabilities = localCapabilities;
          transceiver.remoteCapabilities = remoteCapabilities;
          transceiver.rtpReceiver = rtpReceiver;
          transceiver.rtcpParameters = rtcpParameters;
          transceiver.sendEncodingParameters = sendEncodingParameters;
          transceiver.recvEncodingParameters = recvEncodingParameters;
  
          // Start the RTCRtpReceiver now. The RTPSender is started in
          // setLocalDescription.
          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;
          rtpReceiver = transceiver.rtpReceiver;
          sendEncodingParameters = transceiver.sendEncodingParameters;
          localCapabilities = transceiver.localCapabilities;
  
          self.transceivers[sdpMLineIndex].recvEncodingParameters =
              recvEncodingParameters;
          self.transceivers[sdpMLineIndex].remoteCapabilities =
              remoteCapabilities;
          self.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;
  
          if ((isIceLite || isComplete) && cands.length) {
            iceTransport.setRemoteCandidates(cands);
          }
          if (!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;
            if (remoteMsid) {
              if (!streams[remoteMsid.stream]) {
                streams[remoteMsid.stream] = new window.MediaStream();
              }
              streams[remoteMsid.stream].addTrack(track);
              receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);
            } else {
              if (!streams.default) {
                streams.default = new window.MediaStream();
              }
              streams.default.addTrack(track);
              receiverList.push([track, rtpReceiver, streams.default]);
            }
          } 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 +
              '"');
      }
      Object.keys(streams).forEach(function(sid) {
        var stream = streams[sid];
        if (stream.getTracks().length) {
          self.remoteStreams.push(stream);
          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];
            if (stream.id !== item[2].id) {
              return;
            }
            var trackEvent = new Event('track');
            trackEvent.track = track;
            trackEvent.receiver = receiver;
            trackEvent.streams = [stream];
            self.dispatchEvent(trackEvent);
            if (self.ontrack !== null) {
              window.setTimeout(function() {
                self.ontrack(trackEvent);
              }, 0);
            }
          });
        }
      });
  
      // check whether addIceCandidate({}) was called within four seconds after
      // setRemoteDescription.
      window.setTimeout(function() {
        if (!(self && self.transceivers)) {
          return;
        }
        self.transceivers.forEach(function(transceiver) {
          if (transceiver.iceTransport &&
              transceiver.iceTransport.state === 'new' &&
              transceiver.iceTransport.getRemoteCandidates().length > 0) {
            console.warn('Timeout for addRemoteCandidate. Consider sending ' +
                'an end-of-candidates notification');
            transceiver.iceTransport.addRemoteCandidate({});
          }
        });
      }, 4000);
  
      if (arguments.length > 1 && typeof arguments[1] === 'function') {
        window.setTimeout(arguments[1], 0);
      }
      return Promise.resolve();
    };
  
    RTCPeerConnection.prototype.close = function() {
      this.transceivers.forEach(function(transceiver) {
        /* not yet
        if (transceiver.iceGatherer) {
          transceiver.iceGatherer.close();
        }
        */
        if (transceiver.iceTransport) {
          transceiver.iceTransport.stop();
        }
        if (transceiver.dtlsTransport) {
          transceiver.dtlsTransport.stop();
        }
        if (transceiver.rtpSender) {
          transceiver.rtpSender.stop();
        }
        if (transceiver.rtpReceiver) {
          transceiver.rtpReceiver.stop();
        }
      });
      // FIXME: clean up tracks, local streams, remote streams, etc
      this._updateSignalingState('closed');
    };
  
    // Update the signaling state.
    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.
    RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {
      var self = this;
      if (this.signalingState !== 'stable' || this.needNegotiation === true) {
        return;
      }
      this.needNegotiation = true;
      window.setTimeout(function() {
        if (self.needNegotiation === false) {
          return;
        }
        self.needNegotiation = false;
        var event = new Event('negotiationneeded');
        self.dispatchEvent(event);
        if (self.onnegotiationneeded !== null) {
          self.onnegotiationneeded(event);
        }
      }, 0);
    };
  
    // Update the connection state.
    RTCPeerConnection.prototype._updateConnectionState = function() {
      var self = this;
      var newState;
      var states = {
        'new': 0,
        closed: 0,
        connecting: 0,
        checking: 0,
        connected: 0,
        completed: 0,
        disconnected: 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);
        }
      }
    };
  
    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 numAudioTracks = this.transceivers.filter(function(t) {
        return t.kind === 'audio';
      }).length;
      var numVideoTracks = this.transceivers.filter(function(t) {
        return t.kind === 'video';
      }).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) {
          if (offerOptions.offerToReceiveAudio === true) {
            numAudioTracks = 1;
          } else if (offerOptions.offerToReceiveAudio === false) {
            numAudioTracks = 0;
          } else {
            numAudioTracks = offerOptions.offerToReceiveAudio;
          }
        }
        if (offerOptions.offerToReceiveVideo !== undefined) {
          if (offerOptions.offerToReceiveVideo === true) {
            numVideoTracks = 1;
          } else if (offerOptions.offerToReceiveVideo === false) {
            numVideoTracks = 0;
          } else {
            numVideoTracks = offerOptions.offerToReceiveVideo;
          }
        }
      }
  
      this.transceivers.forEach(function(transceiver) {
        if (transceiver.kind === 'audio') {
          numAudioTracks--;
          if (numAudioTracks < 0) {
            transceiver.wantReceive = false;
          }
        } else if (transceiver.kind === 'video') {
          numVideoTracks--;
          if (numVideoTracks < 0) {
            transceiver.wantReceive = false;
          }
        }
      });
  
      // Create M-lines for recvonly streams.
      while (numAudioTracks > 0 || numVideoTracks > 0) {
        if (numAudioTracks > 0) {
          this._createTransceiver('audio');
          numAudioTracks--;
        }
        if (numVideoTracks > 0) {
          this._createTransceiver('video');
          numVideoTracks--;
        }
      }
      // reorder tracks
      var transceivers = sortTracks(this.transceivers);
  
      var sdp = SDPUtils.writeSessionBoilerplate();
      transceivers.forEach(function(transceiver, sdpMLineIndex) {
        // For each track, create an ice gatherer, ice transport,
        // dtls transport, potentially rtpsender and rtpreceiver.
        var track = transceiver.track;
        var kind = transceiver.kind;
        var mid = SDPUtils.generateIdentifier();
        transceiver.mid = mid;
  
        if (!transceiver.iceGatherer) {
          transceiver.iceGatherer = self.usingBundle && sdpMLineIndex > 0 ?
              transceivers[0].iceGatherer :
              self._createIceGatherer(mid, sdpMLineIndex);
        }
  
        var localCapabilities = window.RTCRtpSender.getCapabilities(kind);
        // filter RTX until additional stuff needed for RTX is implemented
        // in adapter.js
        if (edgeVersion < 15019) {
          localCapabilities.codecs = localCapabilities.codecs.filter(
              function(codec) {
                return codec.name !== 'rtx';
              });
        }
        localCapabilities.codecs.forEach(function(codec) {
          // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552
          // by adding level-asymmetry-allowed=1
          if (codec.name === 'H264' &&
              codec.parameters['level-asymmetry-allowed'] === undefined) {
            codec.parameters['level-asymmetry-allowed'] = '1';
          }
        });
  
        // generate an ssrc now, to be used later in rtpSender.send
        var sendEncodingParameters = [{
          ssrc: (2 * sdpMLineIndex + 1) * 1001
        }];
        if (track) {
          // add RTX
          if (edgeVersion >= 15019 && kind === 'video') {
            sendEncodingParameters[0].rtx = {
              ssrc: (2 * sdpMLineIndex + 1) * 1001 + 1
            };
          }
        }
  
        if (transceiver.wantReceive) {
          transceiver.rtpReceiver = new window.RTCRtpReceiver(
            transceiver.dtlsTransport,
            kind
          );
        }
  
        transceiver.localCapabilities = localCapabilities;
        transceiver.sendEncodingParameters = sendEncodingParameters;
      });
  
      // always offer BUNDLE and dispose on return if not supported.
      if (this._config.bundlePolicy !== 'max-compat') {
        sdp += 'a=group:BUNDLE ' + transceivers.map(function(t) {
          return t.mid;
        }).join(' ') + '\r\n';
      }
      sdp += 'a=ice-options:trickle\r\n';
  
      transceivers.forEach(function(transceiver, sdpMLineIndex) {
        sdp += SDPUtils.writeMediaSection(transceiver,
            transceiver.localCapabilities, 'offer', transceiver.stream);
        sdp += 'a=rtcp-rsize\r\n';
      });
  
      this._pendingOffer = transceivers;
      var desc = new window.RTCSessionDescription({
        type: 'offer',
        sdp: sdp
      });
      if (arguments.length && typeof arguments[0] === 'function') {
        window.setTimeout(arguments[0], 0, desc);
      }
      return Promise.resolve(desc);
    };
  
    RTCPeerConnection.prototype.createAnswer = function() {
      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, sdpMLineIndex) {
        if (transceiver.isDatachannel) {
          sdp += 'm=application 0 DTLS/SCTP 5000\r\n' +
              'c=IN IP4 0.0.0.0\r\n' +
              'a=mid:' + transceiver.mid + '\r\n';
          return;
        }
  
        // FIXME: look at direction.
        if (transceiver.stream) {
          var localTrack;
          if (transceiver.kind === 'audio') {
            localTrack = transceiver.stream.getAudioTracks()[0];
          } else if (transceiver.kind === 'video') {
            localTrack = transceiver.stream.getVideoTracks()[0];
          }
          if (localTrack) {
            // add RTX
            if (edgeVersion >= 15019 && transceiver.kind === 'video') {
              transceiver.sendEncodingParameters[0].rtx = {
                ssrc: (2 * sdpMLineIndex + 2) * 1001 + 1
              };
            }
          }
        }
  
        // Calculate intersection of capabilities.
        var commonCapabilities = getCommonCapabilities(
            transceiver.localCapabilities,
            transceiver.remoteCapabilities);
  
        var hasRtx = commonCapabilities.codecs.filter(function(c) {
          return c.name.toLowerCase() === 'rtx';
        }).length;
        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
          delete transceiver.sendEncodingParameters[0].rtx;
        }
  
        sdp += SDPUtils.writeMediaSection(transceiver, commonCapabilities,
            'answer', transceiver.stream);
        if (transceiver.rtcpParameters &&
            transceiver.rtcpParameters.reducedSize) {
          sdp += 'a=rtcp-rsize\r\n';
        }
      });
  
      var desc = new window.RTCSessionDescription({
        type: 'answer',
        sdp: sdp
      });
      if (arguments.length && typeof arguments[0] === 'function') {
        window.setTimeout(arguments[0], 0, desc);
      }
      return Promise.resolve(desc);
    };
  
    RTCPeerConnection.prototype.addIceCandidate = function(candidate) {
      if (!candidate) {
        for (var j = 0; j < this.transceivers.length; j++) {
          this.transceivers[j].iceTransport.addRemoteCandidate({});
          if (this.usingBundle) {
            return Promise.resolve();
          }
        }
      } 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 Promise.resolve();
          }
          // Ignore RTCP candidates, we assume RTCP-MUX.
          if (cand.component &&
              !(cand.component === '1' || cand.component === 1)) {
            return Promise.resolve();
          }
          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();
    };
  
    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];
      var fixStatsType = function(stat) {
        return {
          inboundrtp: 'inbound-rtp',
          outboundrtp: 'outbound-rtp',
          candidatepair: 'candidate-pair',
          localcandidate: 'local-candidate',
          remotecandidate: 'remote-candidate'
        }[stat.type] || stat.type;
      };
      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) {
              result[id].type = fixStatsType(result[id]);
              results.set(id, result[id]);
            });
          });
          if (cb) {
            window.setTimeout(cb, 0, results);
          }
          resolve(results);
        });
      });
    };
    return RTCPeerConnection;
  };
  
  },{"sdp":1}],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 utils = require('../utils');
  
  var firefoxShim = {
    shimOnTrack: function(window) {
      if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
          window.RTCPeerConnection.prototype)) {
        Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
          get: function() {
            return this._ontrack;
          },
          set: function(f) {
            if (this._ontrack) {
              this.removeEventListener('track', this._ontrack);
              this.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(window) {
      // 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(window) {
      var browserDetails = utils.detectBrowser(window);
  
      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 window.mozRTCPeerConnection(pcConfig, pcConstraints);
        };
        window.RTCPeerConnection.prototype =
            window.mozRTCPeerConnection.prototype;
  
        // wrap static methods. Currently just generateCertificate.
        if (window.mozRTCPeerConnection.generateCertificate) {
          Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
            get: function() {
              return window.mozRTCPeerConnection.generateCertificate;
            }
          });
        }
  
        window.RTCSessionDescription = window.mozRTCSessionDescription;
        window.RTCIceCandidate = window.mozRTCIceCandidate;
      }
  
      // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.
      ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
          .forEach(function(method) {
            var nativeMethod = window.RTCPeerConnection.prototype[method];
            window.RTCPeerConnection.prototype[method] = function() {
              arguments[0] = new ((method === 'addIceCandidate') ?
                  window.RTCIceCandidate :
                  window.RTCSessionDescription)(arguments[0]);
              return nativeMethod.apply(this, arguments);
            };
          });
  
      // support for addIceCandidate(null or undefined)
      var nativeAddIceCandidate =
          window.RTCPeerConnection.prototype.addIceCandidate;
      window.RTCPeerConnection.prototype.addIceCandidate = function() {
        if (!arguments[0]) {
          if (arguments[1]) {
            arguments[1].apply(null);
          }
          return Promise.resolve();
        }
        return nativeAddIceCandidate.apply(this, arguments);
      };
  
      // 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 modernStatsTypes = {
        inboundrtp: 'inbound-rtp',
        outboundrtp: 'outbound-rtp',
        candidatepair: 'candidate-pair',
        localcandidate: 'local-candidate',
        remotecandidate: 'remote-candidate'
      };
  
      var nativeGetStats = window.RTCPeerConnection.prototype.getStats;
      window.RTCPeerConnection.prototype.getStats = function(
        selector,
        onSucc,
        onErr
      ) {
        return nativeGetStats.apply(this, [selector || null])
          .then(function(stats) {
            if (browserDetails.version < 48) {
              stats = makeMapStats(stats);
            }
            if (browserDetails.version < 53 && !onSucc) {
              // Shim only promise getStats with spec-hyphens in type names
              // Leave callback version alone; misc old uses of forEach before Map
              try {
                stats.forEach(function(stat) {
                  stat.type = modernStatsTypes[stat.type] || stat.type;
                });
              } catch (e) {
                if (e.name !== 'TypeError') {
                  throw e;
                }
                // Avoid TypeError: "type" is read-only, in old versions. 34-43ish
                stats.forEach(function(stat, i) {
                  stats.set(i, Object.assign({}, stat, {
                    type: modernStatsTypes[stat.type] || stat.type
                  }));
                });
              }
            }
            return stats;
          })
          .then(onSucc, onErr);
      };
    }
  };
  
  // Expose public methods.
  module.exports = {
    shimOnTrack: firefoxShim.shimOnTrack,
    shimSourceObject: firefoxShim.shimSourceObject,
    shimPeerConnection: firefoxShim.shimPeerConnection,
    shimGetUserMedia: require('./getusermedia')
  };
  
  },{"../utils":12,"./getusermedia":10}],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 utils = require('../utils');
  var logging = utils.log;
  
  // Expose public methods.
  module.exports = function(window) {
    var browserDetails = utils.detectBrowser(window);
    var navigator = window && window.navigator;
    var MediaStreamTrack = window && window.MediaStreamTrack;
  
    var shimError_ = function(e) {
      return {
        name: {
          InternalError: 'NotReadableError',
          NotSupportedError: 'TypeError',
          PermissionDeniedError: 'NotAllowedError',
          SecurityError: '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).then(function(stream) {
          // Work around https://bugzil.la/802326
          if (c.audio && !stream.getAudioTracks().length ||
              c.video && !stream.getVideoTracks().length) {
            stream.getTracks().forEach(function(track) {
              track.stop();
            });
            throw new DOMException('The object can not be found here.',
                                   'NotFoundError');
          }
          return stream;
        }, function(e) {
          return Promise.reject(shimError_(e));
        });
      };
    }
    if (!(browserDetails.version > 55 &&
        'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {
      var remap = function(obj, a, b) {
        if (a in obj && !(b in obj)) {
          obj[b] = obj[a];
          delete obj[a];
        }
      };
  
      var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.
          bind(navigator.mediaDevices);
      navigator.mediaDevices.getUserMedia = function(c) {
        if (typeof c === 'object' && typeof c.audio === 'object') {
          c = JSON.parse(JSON.stringify(c));
          remap(c.audio, 'autoGainControl', 'mozAutoGainControl');
          remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');
        }
        return nativeGetUserMedia(c);
      };
  
      if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {
        var nativeGetSettings = MediaStreamTrack.prototype.getSettings;
        MediaStreamTrack.prototype.getSettings = function() {
          var obj = nativeGetSettings.apply(this, arguments);
          remap(obj, 'mozAutoGainControl', 'autoGainControl');
          remap(obj, 'mozNoiseSuppression', 'noiseSuppression');
          return obj;
        };
      }
  
      if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {
        var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;
        MediaStreamTrack.prototype.applyConstraints = function(c) {
          if (this.kind === 'audio' && typeof c === 'object') {
            c = JSON.parse(JSON.stringify(c));
            remap(c, 'autoGainControl', 'mozAutoGainControl');
            remap(c, 'noiseSuppression', 'mozNoiseSuppression');
          }
          return nativeApplyConstraints.apply(this, [c]);
        };
      }
    }
    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":12}],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.
   */
  'use strict';
  var safariShim = {
    // TODO: DrAlex, should be here, double check against LayoutTests
  
    // TODO: once the back-end for the mac port is done, add.
    // TODO: check for webkitGTK+
    // shimPeerConnection: function() { },
  
    shimAddStream: function(window) {
      if (typeof window === 'object' && window.RTCPeerConnection &&
          !('addStream' in window.RTCPeerConnection.prototype)) {
        window.RTCPeerConnection.prototype.addStream = function(stream) {
          var self = this;
          stream.getTracks().forEach(function(track) {
            self.addTrack(track, stream);
          });
        };
      }
    },
    shimOnAddStream: function(window) {
      if (typeof window === 'object' && window.RTCPeerConnection &&
          !('onaddstream' in window.RTCPeerConnection.prototype)) {
        Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {
          get: function() {
            return this._onaddstream;
          },
          set: function(f) {
            if (this._onaddstream) {
              this.removeEventListener('addstream', this._onaddstream);
              this.removeEventListener('track', this._onaddstreampoly);
            }
            this.addEventListener('addstream', this._onaddstream = f);
            this.addEventListener('track', this._onaddstreampoly = function(e) {
              var stream = e.streams[0];
              if (!this._streams) {
                this._streams = [];
              }
              if (this._streams.indexOf(stream) >= 0) {
                return;
              }
              this._streams.push(stream);
              var event = new Event('addstream');
              event.stream = e.streams[0];
              this.dispatchEvent(event);
            }.bind(this));
          }
        });
      }
    },
    shimCallbacksAPI: function(window) {
      if (typeof window !== 'object' || !window.RTCPeerConnection) {
        return;
      }
      var prototype = window.RTCPeerConnection.prototype;
      var createOffer = prototype.createOffer;
      var createAnswer = prototype.createAnswer;
      var setLocalDescription = prototype.setLocalDescription;
      var setRemoteDescription = prototype.setRemoteDescription;
      var addIceCandidate = prototype.addIceCandidate;
  
      prototype.createOffer = function(successCallback, failureCallback) {
        var options = (arguments.length >= 2) ? arguments[2] : arguments[0];
        var promise = createOffer.apply(this, [options]);
        if (!failureCallback) {
          return promise;
        }
        promise.then(successCallback, failureCallback);
        return Promise.resolve();
      };
  
      prototype.createAnswer = function(successCallback, failureCallback) {
        var options = (arguments.length >= 2) ? arguments[2] : arguments[0];
        var promise = createAnswer.apply(this, [options]);
        if (!failureCallback) {
          return promise;
        }
        promise.then(successCallback, failureCallback);
        return Promise.resolve();
      };
  
      var withCallback = function(description, successCallback, failureCallback) {
        var promise = setLocalDescription.apply(this, [description]);
        if (!failureCallback) {
          return promise;
        }
        promise.then(successCallback, failureCallback);
        return Promise.resolve();
      };
      prototype.setLocalDescription = withCallback;
  
      withCallback = function(description, successCallback, failureCallback) {
        var promise = setRemoteDescription.apply(this, [description]);
        if (!failureCallback) {
          return promise;
        }
        promise.then(successCallback, failureCallback);
        return Promise.resolve();
      };
      prototype.setRemoteDescription = withCallback;
  
      withCallback = function(candidate, successCallback, failureCallback) {
        var promise = addIceCandidate.apply(this, [candidate]);
        if (!failureCallback) {
          return promise;
        }
        promise.then(successCallback, failureCallback);
        return Promise.resolve();
      };
      prototype.addIceCandidate = withCallback;
    },
    shimGetUserMedia: function(window) {
      var navigator = window && window.navigator;
  
      if (!navigator.getUserMedia) {
        if (navigator.webkitGetUserMedia) {
          navigator.getUserMedia = navigator.webkitGetUserMedia.bind(navigator);
        } else if (navigator.mediaDevices &&
            navigator.mediaDevices.getUserMedia) {
          navigator.getUserMedia = function(constraints, cb, errcb) {
            navigator.mediaDevices.getUserMedia(constraints)
            .then(cb, errcb);
          }.bind(navigator);
        }
      }
    }
  };
  
  // Expose public methods.
  module.exports = {
    shimCallbacksAPI: safariShim.shimCallbacksAPI,
    shimAddStream: safariShim.shimAddStream,
    shimOnAddStream: safariShim.shimOnAddStream,
    shimGetUserMedia: safariShim.shimGetUserMedia
    // TODO
    // shimPeerConnection: safariShim.shimPeerConnection
  };
  
  },{}],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 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(window) {
      var navigator = window && window.navigator;
  
      // 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\/(\d+)\./, 1);
      } 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)\/(\d+)\./, 2);
        } else { // Safari (in an unpublished version) or unknown webkit-based.
          if (navigator.userAgent.match(/Version\/(\d+).(\d+)/)) {
            result.browser = 'safari';
            result.version = this.extractVersion(navigator.userAgent,
              /AppleWebKit\/(\d+)\./, 1);
          } else { // unknown webkit-based browser.
            result.browser = 'Unsupported webkit-based browser ' +
                'with GUM support but no WebRTC support.';
            return result;
          }
        }
      } else if (navigator.mediaDevices &&
          navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)) { // Edge.
        result.browser = 'edge';
        result.version = this.extractVersion(navigator.userAgent,
            /Edge\/(\d+).(\d+)$/, 2);
      } else if (navigator.mediaDevices &&
          navigator.userAgent.match(/AppleWebKit\/(\d+)\./)) {
          // Safari, with webkitGetUserMedia removed.
        result.browser = 'safari';
        result.version = this.extractVersion(navigator.userAgent,
            /AppleWebKit\/(\d+)\./, 1);
      } else { // Default fallthrough: not supported.
        result.browser = 'Not a supported browser.';
        return result;
      }
  
      return result;
    },
  
    // shimCreateObjectURL must be called before shimSourceObject to avoid loop.
  
    shimCreateObjectURL: function(window) {
      var URL = window && window.URL;
  
      if (!(typeof window === 'object' && window.HTMLMediaElement &&
            'srcObject' in window.HTMLMediaElement.prototype)) {
        // Only shim CreateObjectURL using srcObject if srcObject exists.
        return undefined;
      }
  
      var nativeCreateObjectURL = URL.createObjectURL.bind(URL);
      var nativeRevokeObjectURL = URL.revokeObjectURL.bind(URL);
      var streams = new Map(), newId = 0;
  
      URL.createObjectURL = function(stream) {
        if ('getTracks' in stream) {
          var url = 'polyblob:' + (++newId);
          streams.set(url, stream);
          console.log('URL.createObjectURL(stream) is deprecated! ' +
                      'Use elem.srcObject = stream instead!');
          return url;
        }
        return nativeCreateObjectURL(stream);
      };
      URL.revokeObjectURL = function(url) {
        nativeRevokeObjectURL(url);
        streams.delete(url);
      };
  
      var dsc = Object.getOwnPropertyDescriptor(window.HTMLMediaElement.prototype,
                                                'src');
      Object.defineProperty(window.HTMLMediaElement.prototype, 'src', {
        get: function() {
          return dsc.get.apply(this);
        },
        set: function(url) {
          this.srcObject = streams.get(url) || null;
          return dsc.set.apply(this, [url]);
        }
      });
  
      var nativeSetAttribute = window.HTMLMediaElement.prototype.setAttribute;
      window.HTMLMediaElement.prototype.setAttribute = function() {
        if (arguments.length === 2 &&
            ('' + arguments[0]).toLowerCase() === 'src') {
          this.srcObject = streams.get(arguments[1]) || null;
        }
        return nativeSetAttribute.apply(this, arguments);
      };
    }
  };
  
  // Export.
  module.exports = {
    log: utils.log,
    disableLog: utils.disableLog,
    extractVersion: utils.extractVersion,
    shimCreateObjectURL: utils.shimCreateObjectURL,
    detectBrowser: utils.detectBrowser.bind(utils)
  };
  
  },{}]},{},[2])(2)
  });