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*  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nlet logDisabled_ = true;\nlet deprecationWarnings_ = true;\n\n/**\n * Extract browser version out of the provided user agent string.\n *\n * @param {!string} uastring userAgent string.\n * @param {!string} expr Regular expression used as match criteria.\n * @param {!number} pos position in the version string to be returned.\n * @return {!number} browser version.\n */\nexport function extractVersion(uastring, expr, pos) {\n  const match = uastring.match(expr);\n  return match && match.length >= pos && parseInt(match[pos], 10);\n}\n\n// Wraps the peerconnection event eventNameToWrap in a function\n// which returns the modified event object (or false to prevent\n// the event).\nexport function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  const nativeAddEventListener = proto.addEventListener;\n  proto.addEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap) {\n      return nativeAddEventListener.apply(this, arguments);\n    }\n    const wrappedCallback = (e) => {\n      const modifiedEvent = wrapper(e);\n      if (modifiedEvent) {\n        if (cb.handleEvent) {\n          cb.handleEvent(modifiedEvent);\n        } else {\n          cb(modifiedEvent);\n        }\n      }\n    };\n    this._eventMap = this._eventMap || {};\n    if (!this._eventMap[eventNameToWrap]) {\n      this._eventMap[eventNameToWrap] = new Map();\n    }\n    this._eventMap[eventNameToWrap].set(cb, wrappedCallback);\n    return nativeAddEventListener.apply(this, [nativeEventName,\n      wrappedCallback]);\n  };\n\n  const nativeRemoveEventListener = proto.removeEventListener;\n  proto.removeEventListener = function(nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap || !this._eventMap\n        || !this._eventMap[eventNameToWrap]) {\n      return nativeRemoveEventListener.apply(this, arguments);\n    }\n    if (!this._eventMap[eventNameToWrap].has(cb)) {\n      return nativeRemoveEventListener.apply(this, arguments);\n    }\n    const unwrappedCb = this._eventMap[eventNameToWrap].get(cb);\n    this._eventMap[eventNameToWrap].delete(cb);\n    if (this._eventMap[eventNameToWrap].size === 0) {\n      delete this._eventMap[eventNameToWrap];\n    }\n    if (Object.keys(this._eventMap).length === 0) {\n      delete this._eventMap;\n    }\n    return nativeRemoveEventListener.apply(this, [nativeEventName,\n      unwrappedCb]);\n  };\n\n  Object.defineProperty(proto, 'on' + eventNameToWrap, {\n    get() {\n      return this['_on' + eventNameToWrap];\n    },\n    set(cb) {\n      if (this['_on' + eventNameToWrap]) {\n        this.removeEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap]);\n        delete this['_on' + eventNameToWrap];\n      }\n      if (cb) {\n        this.addEventListener(eventNameToWrap,\n            this['_on' + eventNameToWrap] = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n}\n\nexport function disableLog(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  logDisabled_ = bool;\n  return (bool) ? 'adapter.js logging disabled' :\n      'adapter.js logging enabled';\n}\n\n/**\n * Disable or enable deprecation warnings\n * @param {!boolean} bool set to true to disable warnings.\n */\nexport function disableWarnings(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + typeof bool +\n        '. Please use a boolean.');\n  }\n  deprecationWarnings_ = !bool;\n  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');\n}\n\nexport function log() {\n  if (typeof window === 'object') {\n    if (logDisabled_) {\n      return;\n    }\n    if (typeof console !== 'undefined' && typeof console.log === 'function') {\n      console.log.apply(console, arguments);\n    }\n  }\n}\n\n/**\n * Shows a deprecation warning suggesting the modern and spec-compatible API.\n */\nexport function deprecated(oldMethod, newMethod) {\n  if (!deprecationWarnings_) {\n    return;\n  }\n  console.warn(oldMethod + ' is deprecated, please use ' + newMethod +\n      ' instead.');\n}\n\n/**\n * Browser detector.\n *\n * @return {object} result containing browser and version\n *     properties.\n */\nexport function detectBrowser(window) {\n  // Returned result object.\n  const result = {browser: null, version: null};\n\n  // Fail early if it's not a browser\n  if (typeof window === 'undefined' || !window.navigator) {\n    result.browser = 'Not a browser.';\n    return result;\n  }\n\n  const {navigator} = window;\n\n  if (navigator.mozGetUserMedia) { // Firefox.\n    result.browser = 'firefox';\n    result.version = extractVersion(navigator.userAgent,\n        /Firefox\\/(\\d+)\\./, 1);\n  } else if (navigator.webkitGetUserMedia ||\n      (window.isSecureContext === false && window.webkitRTCPeerConnection &&\n       !window.RTCIceGatherer)) {\n    // Chrome, Chromium, Webview, Opera.\n    // Version matches Chrome/WebRTC version.\n    // Chrome 74 removed webkitGetUserMedia on http as well so we need the\n    // more complicated fallback to webkitRTCPeerConnection.\n    result.browser = 'chrome';\n    result.version = extractVersion(navigator.userAgent,\n        /Chrom(e|ium)\\/(\\d+)\\./, 2);\n  } else if (navigator.mediaDevices &&\n      navigator.userAgent.match(/Edge\\/(\\d+).(\\d+)$/)) { // Edge.\n    result.browser = 'edge';\n    result.version = extractVersion(navigator.userAgent,\n        /Edge\\/(\\d+).(\\d+)$/, 2);\n  } else if (window.RTCPeerConnection &&\n      navigator.userAgent.match(/AppleWebKit\\/(\\d+)\\./)) { // Safari.\n    result.browser = 'safari';\n    result.version = extractVersion(navigator.userAgent,\n        /AppleWebKit\\/(\\d+)\\./, 1);\n    result.supportsUnifiedPlan = window.RTCRtpTransceiver &&\n        'currentDirection' in window.RTCRtpTransceiver.prototype;\n  } else { // Default fallthrough: not supported.\n    result.browser = 'Not a supported browser.';\n    return result;\n  }\n\n  return result;\n}\n\n/**\n * Checks if something is an object.\n *\n * @param {*} val The something you want to check.\n * @return true if val is an object, false otherwise.\n */\nfunction isObject(val) {\n  return Object.prototype.toString.call(val) === '[object Object]';\n}\n\n/**\n * Remove all empty objects and undefined values\n * from a nested object -- an enhanced and vanilla version\n * of Lodash's `compact`.\n */\nexport function compactObject(data) {\n  if (!isObject(data)) {\n    return data;\n  }\n\n  return Object.keys(data).reduce(function(accumulator, key) {\n    const isObj = isObject(data[key]);\n    const value = isObj ? compactObject(data[key]) : data[key];\n    const isEmptyObject = isObj && !Object.keys(value).length;\n    if (value === undefined || isEmptyObject) {\n      return accumulator;\n    }\n    return Object.assign(accumulator, {[key]: value});\n  }, {});\n}\n\n/* iterates the stats graph recursively. */\nexport function walkStats(stats, base, resultSet) {\n  if (!base || resultSet.has(base.id)) {\n    return;\n  }\n  resultSet.set(base.id, base);\n  Object.keys(base).forEach(name => {\n    if (name.endsWith('Id')) {\n      walkStats(stats, stats.get(base[name]), resultSet);\n    } else if (name.endsWith('Ids')) {\n      base[name].forEach(id => {\n        walkStats(stats, stats.get(id), resultSet);\n      });\n    }\n  });\n}\n\n/* filter getStats for a sender/receiver track. */\nexport function filterStats(result, track, outbound) {\n  const streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';\n  const filteredResult = new Map();\n  if (track === null) {\n    return filteredResult;\n  }\n  const trackStats = [];\n  result.forEach(value => {\n    if (value.type === 'track' &&\n        value.trackIdentifier === track.id) {\n      trackStats.push(value);\n    }\n  });\n  trackStats.forEach(trackStat => {\n    result.forEach(stats => {\n      if (stats.type === streamStatsType && stats.trackId === trackStat.id) {\n        walkStats(result, stats, filteredResult);\n      }\n    });\n  });\n  return filteredResult;\n}\n\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\nconst logging = utils.log;\n\nexport function shimGetUserMedia(window, browserDetails) {\n  const navigator = window && window.navigator;\n\n  if (!navigator.mediaDevices) {\n    return;\n  }\n\n  const constraintsToChrome_ = function(c) {\n    if (typeof c !== 'object' || c.mandatory || c.optional) {\n      return c;\n    }\n    const cc = {};\n    Object.keys(c).forEach(key => {\n      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n        return;\n      }\n      const r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};\n      if (r.exact !== undefined && typeof r.exact === 'number') {\n        r.min = r.max = r.exact;\n      }\n      const oldname_ = function(prefix, name) {\n        if (prefix) {\n          return prefix + name.charAt(0).toUpperCase() + name.slice(1);\n        }\n        return (name === 'deviceId') ? 'sourceId' : name;\n      };\n      if (r.ideal !== undefined) {\n        cc.optional = cc.optional || [];\n        let oc = {};\n        if (typeof r.ideal === 'number') {\n          oc[oldname_('min', key)] = r.ideal;\n          cc.optional.push(oc);\n          oc = {};\n          oc[oldname_('max', key)] = r.ideal;\n          cc.optional.push(oc);\n        } else {\n          oc[oldname_('', key)] = r.ideal;\n          cc.optional.push(oc);\n        }\n      }\n      if (r.exact !== undefined && typeof r.exact !== 'number') {\n        cc.mandatory = cc.mandatory || {};\n        cc.mandatory[oldname_('', key)] = r.exact;\n      } else {\n        ['min', 'max'].forEach(mix => {\n          if (r[mix] !== undefined) {\n            cc.mandatory = cc.mandatory || {};\n            cc.mandatory[oldname_(mix, key)] = r[mix];\n          }\n        });\n      }\n    });\n    if (c.advanced) {\n      cc.optional = (cc.optional || []).concat(c.advanced);\n    }\n    return cc;\n  };\n\n  const shimConstraints_ = function(constraints, func) {\n    if (browserDetails.version >= 61) {\n      return func(constraints);\n    }\n    constraints = JSON.parse(JSON.stringify(constraints));\n    if (constraints && typeof constraints.audio === 'object') {\n      const remap = function(obj, a, b) {\n        if (a in obj && !(b in obj)) {\n          obj[b] = obj[a];\n          delete obj[a];\n        }\n      };\n      constraints = JSON.parse(JSON.stringify(constraints));\n      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');\n      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');\n      constraints.audio = constraintsToChrome_(constraints.audio);\n    }\n    if (constraints && typeof constraints.video === 'object') {\n      // Shim facingMode for mobile & surface pro.\n      let face = constraints.video.facingMode;\n      face = face && ((typeof face === 'object') ? face : {ideal: face});\n      const getSupportedFacingModeLies = browserDetails.version < 66;\n\n      if ((face && (face.exact === 'user' || face.exact === 'environment' ||\n                    face.ideal === 'user' || face.ideal === 'environment')) &&\n          !(navigator.mediaDevices.getSupportedConstraints &&\n            navigator.mediaDevices.getSupportedConstraints().facingMode &&\n            !getSupportedFacingModeLies)) {\n        delete constraints.video.facingMode;\n        let matches;\n        if (face.exact === 'environment' || face.ideal === 'environment') {\n          matches = ['back', 'rear'];\n        } else if (face.exact === 'user' || face.ideal === 'user') {\n          matches = ['front'];\n        }\n        if (matches) {\n          // Look for matches in label, or use last cam for back (typical).\n          return navigator.mediaDevices.enumerateDevices()\n          .then(devices => {\n            devices = devices.filter(d => d.kind === 'videoinput');\n            let dev = devices.find(d => matches.some(match =>\n              d.label.toLowerCase().includes(match)));\n            if (!dev && devices.length && matches.includes('back')) {\n              dev = devices[devices.length - 1]; // more likely the back cam\n            }\n            if (dev) {\n              constraints.video.deviceId = face.exact ? {exact: dev.deviceId} :\n                                                        {ideal: dev.deviceId};\n            }\n            constraints.video = constraintsToChrome_(constraints.video);\n            logging('chrome: ' + JSON.stringify(constraints));\n            return func(constraints);\n          });\n        }\n      }\n      constraints.video = constraintsToChrome_(constraints.video);\n    }\n    logging('chrome: ' + JSON.stringify(constraints));\n    return func(constraints);\n  };\n\n  const shimError_ = function(e) {\n    if (browserDetails.version >= 64) {\n      return e;\n    }\n    return {\n      name: {\n        PermissionDeniedError: 'NotAllowedError',\n        PermissionDismissedError: 'NotAllowedError',\n        InvalidStateError: 'NotAllowedError',\n        DevicesNotFoundError: 'NotFoundError',\n        ConstraintNotSatisfiedError: 'OverconstrainedError',\n        TrackStartError: 'NotReadableError',\n        MediaDeviceFailedDueToShutdown: 'NotAllowedError',\n        MediaDeviceKillSwitchOn: 'NotAllowedError',\n        TabCaptureError: 'AbortError',\n        ScreenCaptureError: 'AbortError',\n        DeviceCaptureError: 'AbortError'\n      }[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint || e.constraintName,\n      toString() {\n        return this.name + (this.message && ': ') + this.message;\n      }\n    };\n  };\n\n  const getUserMedia_ = function(constraints, onSuccess, onError) {\n    shimConstraints_(constraints, c => {\n      navigator.webkitGetUserMedia(c, onSuccess, e => {\n        if (onError) {\n          onError(shimError_(e));\n        }\n      });\n    });\n  };\n  navigator.getUserMedia = getUserMedia_.bind(navigator);\n\n  // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia\n  // function which returns a Promise, it does not accept spec-style\n  // constraints.\n  if (navigator.mediaDevices.getUserMedia) {\n    const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n        bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function(cs) {\n      return shimConstraints_(cs, c => origGetUserMedia(c).then(stream => {\n        if (c.audio && !stream.getAudioTracks().length ||\n            c.video && !stream.getVideoTracks().length) {\n          stream.getTracks().forEach(track => {\n            track.stop();\n          });\n          throw new DOMException('', 'NotFoundError');\n        }\n        return stream;\n      }, e => Promise.reject(shimError_(e))));\n    };\n  }\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\nexport function shimGetDisplayMedia(window, getSourceId) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  // getSourceId is a function that returns a promise resolving with\n  // the sourceId of the screen/window/tab to be shared.\n  if (typeof getSourceId !== 'function') {\n    console.error('shimGetDisplayMedia: getSourceId argument is not ' +\n        'a function');\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    function getDisplayMedia(constraints) {\n      return getSourceId(constraints)\n        .then(sourceId => {\n          const widthSpecified = constraints.video && constraints.video.width;\n          const heightSpecified = constraints.video &&\n            constraints.video.height;\n          const frameRateSpecified = constraints.video &&\n            constraints.video.frameRate;\n          constraints.video = {\n            mandatory: {\n              chromeMediaSource: 'desktop',\n              chromeMediaSourceId: sourceId,\n              maxFrameRate: frameRateSpecified || 3\n            }\n          };\n          if (widthSpecified) {\n            constraints.video.mandatory.maxWidth = widthSpecified;\n          }\n          if (heightSpecified) {\n            constraints.video.mandatory.maxHeight = heightSpecified;\n          }\n          return window.navigator.mediaDevices.getUserMedia(constraints);\n        });\n    };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\nimport * as utils from '../utils.js';\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimMediaStream(window) {\n  window.MediaStream = window.MediaStream || window.webkitMediaStream;\n}\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in\n      window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n      get() {\n        return this._ontrack;\n      },\n      set(f) {\n        if (this._ontrack) {\n          this.removeEventListener('track', this._ontrack);\n        }\n        this.addEventListener('track', this._ontrack = f);\n      },\n      enumerable: true,\n      configurable: true\n    });\n    const origSetRemoteDescription =\n        window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription =\n      function setRemoteDescription() {\n        if (!this._ontrackpoly) {\n          this._ontrackpoly = (e) => {\n            // onaddstream does not fire when a track is added to an existing\n            // stream. But stream.onaddtrack is implemented so we use that.\n            e.stream.addEventListener('addtrack', te => {\n              let receiver;\n              if (window.RTCPeerConnection.prototype.getReceivers) {\n                receiver = this.getReceivers()\n                  .find(r => r.track && r.track.id === te.track.id);\n              } else {\n                receiver = {track: te.track};\n              }\n\n              const event = new Event('track');\n              event.track = te.track;\n              event.receiver = receiver;\n              event.transceiver = {receiver};\n              event.streams = [e.stream];\n              this.dispatchEvent(event);\n            });\n            e.stream.getTracks().forEach(track => {\n              let receiver;\n              if (window.RTCPeerConnection.prototype.getReceivers) {\n                receiver = this.getReceivers()\n                  .find(r => r.track && r.track.id === track.id);\n              } else {\n                receiver = {track};\n              }\n              const event = new Event('track');\n              event.track = track;\n              event.receiver = receiver;\n              event.transceiver = {receiver};\n              event.streams = [e.stream];\n              this.dispatchEvent(event);\n            });\n          };\n          this.addEventListener('addstream', this._ontrackpoly);\n        }\n        return origSetRemoteDescription.apply(this, arguments);\n      };\n  } else {\n    // even if RTCRtpTransceiver is in window, it is only used and\n    // emitted in unified-plan. Unfortunately this means we need\n    // to unconditionally wrap the event.\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      if (!e.transceiver) {\n        Object.defineProperty(e, 'transceiver',\n          {value: {receiver: e.receiver}});\n      }\n      return e;\n    });\n  }\n}\n\nexport function shimGetSendersWithDtmf(window) {\n  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.\n  if (typeof window === 'object' && window.RTCPeerConnection &&\n      !('getSenders' in window.RTCPeerConnection.prototype) &&\n      'createDTMFSender' in window.RTCPeerConnection.prototype) {\n    const shimSenderWithDtmf = function(pc, track) {\n      return {\n        track,\n        get dtmf() {\n          if (this._dtmf === undefined) {\n            if (track.kind === 'audio') {\n              this._dtmf = pc.createDTMFSender(track);\n            } else {\n              this._dtmf = null;\n            }\n          }\n          return this._dtmf;\n        },\n        _pc: pc\n      };\n    };\n\n    // augment addTrack when getSenders is not available.\n    if (!window.RTCPeerConnection.prototype.getSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n        this._senders = this._senders || [];\n        return this._senders.slice(); // return a copy of the internal state.\n      };\n      const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n      window.RTCPeerConnection.prototype.addTrack =\n        function addTrack(track, stream) {\n          let sender = origAddTrack.apply(this, arguments);\n          if (!sender) {\n            sender = shimSenderWithDtmf(this, track);\n            this._senders.push(sender);\n          }\n          return sender;\n        };\n\n      const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n      window.RTCPeerConnection.prototype.removeTrack =\n        function removeTrack(sender) {\n          origRemoveTrack.apply(this, arguments);\n          const idx = this._senders.indexOf(sender);\n          if (idx !== -1) {\n            this._senders.splice(idx, 1);\n          }\n        };\n    }\n    const origAddStream = window.RTCPeerConnection.prototype.addStream;\n    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n      this._senders = this._senders || [];\n      origAddStream.apply(this, [stream]);\n      stream.getTracks().forEach(track => {\n        this._senders.push(shimSenderWithDtmf(this, track));\n      });\n    };\n\n    const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n    window.RTCPeerConnection.prototype.removeStream =\n      function removeStream(stream) {\n        this._senders = this._senders || [];\n        origRemoveStream.apply(this, [stream]);\n\n        stream.getTracks().forEach(track => {\n          const sender = this._senders.find(s => s.track === track);\n          if (sender) { // remove sender\n            this._senders.splice(this._senders.indexOf(sender), 1);\n          }\n        });\n      };\n  } else if (typeof window === 'object' && window.RTCPeerConnection &&\n             'getSenders' in window.RTCPeerConnection.prototype &&\n             'createDTMFSender' in window.RTCPeerConnection.prototype &&\n             window.RTCRtpSender &&\n             !('dtmf' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = this._pc.createDTMFSender(this.track);\n          } else {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n}\n\nexport function shimGetStats(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    const [selector, onSucc, onErr] = arguments;\n\n    // If selector is a function then we are in the old style stats so just\n    // pass back the original getStats format to avoid breaking old users.\n    if (arguments.length > 0 && typeof selector === 'function') {\n      return origGetStats.apply(this, arguments);\n    }\n\n    // When spec-style getStats is supported, return those when called with\n    // either no arguments or the selector argument is null.\n    if (origGetStats.length === 0 && (arguments.length === 0 ||\n        typeof selector !== 'function')) {\n      return origGetStats.apply(this, []);\n    }\n\n    const fixChromeStats_ = function(response) {\n      const standardReport = {};\n      const reports = response.result();\n      reports.forEach(report => {\n        const standardStats = {\n          id: report.id,\n          timestamp: report.timestamp,\n          type: {\n            localcandidate: 'local-candidate',\n            remotecandidate: 'remote-candidate'\n          }[report.type] || report.type\n        };\n        report.names().forEach(name => {\n          standardStats[name] = report.stat(name);\n        });\n        standardReport[standardStats.id] = standardStats;\n      });\n\n      return standardReport;\n    };\n\n    // shim getStats with maplike support\n    const makeMapStats = function(stats) {\n      return new Map(Object.keys(stats).map(key => [key, stats[key]]));\n    };\n\n    if (arguments.length >= 2) {\n      const successCallbackWrapper_ = function(response) {\n        onSucc(makeMapStats(fixChromeStats_(response)));\n      };\n\n      return origGetStats.apply(this, [successCallbackWrapper_,\n        selector]);\n    }\n\n    // promise-support\n    return new Promise((resolve, reject) => {\n      origGetStats.apply(this, [\n        function(response) {\n          resolve(makeMapStats(fixChromeStats_(response)));\n        }, reject]);\n    }).then(onSucc, onErr);\n  };\n}\n\nexport function shimSenderReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender && window.RTCRtpReceiver)) {\n    return;\n  }\n\n  // shim sender stats.\n  if (!('getStats' in window.RTCRtpSender.prototype)) {\n    const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    if (origGetSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n        const senders = origGetSenders.apply(this, []);\n        senders.forEach(sender => sender._pc = this);\n        return senders;\n      };\n    }\n\n    const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n    if (origAddTrack) {\n      window.RTCPeerConnection.prototype.addTrack = function addTrack() {\n        const sender = origAddTrack.apply(this, arguments);\n        sender._pc = this;\n        return sender;\n      };\n    }\n    window.RTCRtpSender.prototype.getStats = function getStats() {\n      const sender = this;\n      return this._pc.getStats().then(result =>\n        /* Note: this will include stats of all senders that\n         *   send a track with the same id as sender.track as\n         *   it is not possible to identify the RTCRtpSender.\n         */\n        utils.filterStats(result, sender.track, true));\n    };\n  }\n\n  // shim receiver stats.\n  if (!('getStats' in window.RTCRtpReceiver.prototype)) {\n    const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n    if (origGetReceivers) {\n      window.RTCPeerConnection.prototype.getReceivers =\n        function getReceivers() {\n          const receivers = origGetReceivers.apply(this, []);\n          receivers.forEach(receiver => receiver._pc = this);\n          return receivers;\n        };\n    }\n    utils.wrapPeerConnectionEvent(window, 'track', e => {\n      e.receiver._pc = e.srcElement;\n      return e;\n    });\n    window.RTCRtpReceiver.prototype.getStats = function getStats() {\n      const receiver = this;\n      return this._pc.getStats().then(result =>\n        utils.filterStats(result, receiver.track, false));\n    };\n  }\n\n  if (!('getStats' in window.RTCRtpSender.prototype &&\n      'getStats' in window.RTCRtpReceiver.prototype)) {\n    return;\n  }\n\n  // shim RTCPeerConnection.getStats(track).\n  const origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    if (arguments.length > 0 &&\n        arguments[0] instanceof window.MediaStreamTrack) {\n      const track = arguments[0];\n      let sender;\n      let receiver;\n      let err;\n      this.getSenders().forEach(s => {\n        if (s.track === track) {\n          if (sender) {\n            err = true;\n          } else {\n            sender = s;\n          }\n        }\n      });\n      this.getReceivers().forEach(r => {\n        if (r.track === track) {\n          if (receiver) {\n            err = true;\n          } else {\n            receiver = r;\n          }\n        }\n        return r.track === track;\n      });\n      if (err || (sender && receiver)) {\n        return Promise.reject(new DOMException(\n          'There are more than one sender or receiver for the track.',\n          'InvalidAccessError'));\n      } else if (sender) {\n        return sender.getStats();\n      } else if (receiver) {\n        return receiver.getStats();\n      }\n      return Promise.reject(new DOMException(\n        'There is no sender or receiver for the track.',\n        'InvalidAccessError'));\n    }\n    return origGetStats.apply(this, arguments);\n  };\n}\n\nexport function shimAddTrackRemoveTrackWithNative(window) {\n  // shim addTrack/removeTrack with native variants in order to make\n  // the interactions with legacy getLocalStreams behave as in other browsers.\n  // Keeps a mapping stream.id => [stream, rtpsenders...]\n  window.RTCPeerConnection.prototype.getLocalStreams =\n    function getLocalStreams() {\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n      return Object.keys(this._shimmedLocalStreams)\n        .map(streamId => this._shimmedLocalStreams[streamId][0]);\n    };\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  window.RTCPeerConnection.prototype.addTrack =\n    function addTrack(track, stream) {\n      if (!stream) {\n        return origAddTrack.apply(this, arguments);\n      }\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n      const sender = origAddTrack.apply(this, arguments);\n      if (!this._shimmedLocalStreams[stream.id]) {\n        this._shimmedLocalStreams[stream.id] = [stream, sender];\n      } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {\n        this._shimmedLocalStreams[stream.id].push(sender);\n      }\n      return sender;\n    };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    const existingSenders = this.getSenders();\n    origAddStream.apply(this, arguments);\n    const newSenders = this.getSenders()\n      .filter(newSender => existingSenders.indexOf(newSender) === -1);\n    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream =\n    function removeStream(stream) {\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n      delete this._shimmedLocalStreams[stream.id];\n      return origRemoveStream.apply(this, arguments);\n    };\n\n  const origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n  window.RTCPeerConnection.prototype.removeTrack =\n    function removeTrack(sender) {\n      this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n      if (sender) {\n        Object.keys(this._shimmedLocalStreams).forEach(streamId => {\n          const idx = this._shimmedLocalStreams[streamId].indexOf(sender);\n          if (idx !== -1) {\n            this._shimmedLocalStreams[streamId].splice(idx, 1);\n          }\n          if (this._shimmedLocalStreams[streamId].length === 1) {\n            delete this._shimmedLocalStreams[streamId];\n          }\n        });\n      }\n      return origRemoveTrack.apply(this, arguments);\n    };\n}\n\nexport function shimAddTrackRemoveTrack(window, browserDetails) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  // shim addTrack and removeTrack.\n  if (window.RTCPeerConnection.prototype.addTrack &&\n      browserDetails.version >= 65) {\n    return shimAddTrackRemoveTrackWithNative(window);\n  }\n\n  // also shim pc.getLocalStreams when addTrack is shimmed\n  // to return the original streams.\n  const origGetLocalStreams = window.RTCPeerConnection.prototype\n      .getLocalStreams;\n  window.RTCPeerConnection.prototype.getLocalStreams =\n    function getLocalStreams() {\n      const nativeStreams = origGetLocalStreams.apply(this);\n      this._reverseStreams = this._reverseStreams || {};\n      return nativeStreams.map(stream => this._reverseStreams[stream.id]);\n    };\n\n  const origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n\n    stream.getTracks().forEach(track => {\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n    });\n    // Add identity mapping for consistency with addTrack.\n    // Unless this is being used with a stream from addTrack.\n    if (!this._reverseStreams[stream.id]) {\n      const newStream = new window.MediaStream(stream.getTracks());\n      this._streams[stream.id] = newStream;\n      this._reverseStreams[newStream.id] = stream;\n      stream = newStream;\n    }\n    origAddStream.apply(this, [stream]);\n  };\n\n  const origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream =\n    function removeStream(stream) {\n      this._streams = this._streams || {};\n      this._reverseStreams = this._reverseStreams || {};\n\n      origRemoveStream.apply(this, [(this._streams[stream.id] || stream)]);\n      delete this._reverseStreams[(this._streams[stream.id] ?\n          this._streams[stream.id].id : stream.id)];\n      delete this._streams[stream.id];\n    };\n\n  window.RTCPeerConnection.prototype.addTrack =\n    function addTrack(track, stream) {\n      if (this.signalingState === 'closed') {\n        throw new DOMException(\n          'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n          'InvalidStateError');\n      }\n      const streams = [].slice.call(arguments, 1);\n      if (streams.length !== 1 ||\n          !streams[0].getTracks().find(t => t === track)) {\n        // this is not fully correct but all we can manage without\n        // [[associated MediaStreams]] internal slot.\n        throw new DOMException(\n          'The adapter.js addTrack polyfill only supports a single ' +\n          ' stream which is associated with the specified track.',\n          'NotSupportedError');\n      }\n\n      const alreadyExists = this.getSenders().find(s => s.track === track);\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.',\n            'InvalidAccessError');\n      }\n\n      this._streams = this._streams || {};\n      this._reverseStreams = this._reverseStreams || {};\n      const oldStream = this._streams[stream.id];\n      if (oldStream) {\n        // this is using odd Chrome behaviour, use with caution:\n        // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815\n        // Note: we rely on the high-level addTrack/dtmf shim to\n        // create the sender with a dtmf sender.\n        oldStream.addTrack(track);\n\n        // Trigger ONN async.\n        Promise.resolve().then(() => {\n          this.dispatchEvent(new Event('negotiationneeded'));\n        });\n      } else {\n        const newStream = new window.MediaStream([track]);\n        this._streams[stream.id] = newStream;\n        this._reverseStreams[newStream.id] = stream;\n        this.addStream(newStream);\n      }\n      return this.getSenders().find(s => s.track === track);\n    };\n\n  // replace the internal stream id with the external one and\n  // vice versa.\n  function replaceInternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(internalStream.id, 'g'),\n          externalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  function replaceExternalStreamId(pc, description) {\n    let sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(internalId => {\n      const externalStream = pc._reverseStreams[internalId];\n      const internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(externalStream.id, 'g'),\n          internalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp\n    });\n  }\n  ['createOffer', 'createAnswer'].forEach(function(method) {\n    const nativeMethod = window.RTCPeerConnection.prototype[method];\n    const methodObj = {[method]() {\n      const args = arguments;\n      const isLegacyCall = arguments.length &&\n          typeof arguments[0] === 'function';\n      if (isLegacyCall) {\n        return nativeMethod.apply(this, [\n          (description) => {\n            const desc = replaceInternalStreamId(this, description);\n            args[0].apply(null, [desc]);\n          },\n          (err) => {\n            if (args[1]) {\n              args[1].apply(null, err);\n            }\n          }, arguments[2]\n        ]);\n      }\n      return nativeMethod.apply(this, arguments)\n      .then(description => replaceInternalStreamId(this, description));\n    }};\n    window.RTCPeerConnection.prototype[method] = methodObj[method];\n  });\n\n  const origSetLocalDescription =\n      window.RTCPeerConnection.prototype.setLocalDescription;\n  window.RTCPeerConnection.prototype.setLocalDescription =\n    function setLocalDescription() {\n      if (!arguments.length || !arguments[0].type) {\n        return origSetLocalDescription.apply(this, arguments);\n      }\n      arguments[0] = replaceExternalStreamId(this, arguments[0]);\n      return origSetLocalDescription.apply(this, arguments);\n    };\n\n  // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier\n\n  const origLocalDescription = Object.getOwnPropertyDescriptor(\n      window.RTCPeerConnection.prototype, 'localDescription');\n  Object.defineProperty(window.RTCPeerConnection.prototype,\n      'localDescription', {\n        get() {\n          const description = origLocalDescription.get.apply(this);\n          if (description.type === '') {\n            return description;\n          }\n          return replaceInternalStreamId(this, description);\n        }\n      });\n\n  window.RTCPeerConnection.prototype.removeTrack =\n    function removeTrack(sender) {\n      if (this.signalingState === 'closed') {\n        throw new DOMException(\n          'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n          'InvalidStateError');\n      }\n      // We can not yet check for sender instanceof RTCRtpSender\n      // since we shim RTPSender. So we check if sender._pc is set.\n      if (!sender._pc) {\n        throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' +\n            'does not implement interface RTCRtpSender.', 'TypeError');\n      }\n      const isLocal = sender._pc === this;\n      if (!isLocal) {\n        throw new DOMException('Sender was not created by this connection.',\n            'InvalidAccessError');\n      }\n\n      // Search for the native stream the senders track belongs to.\n      this._streams = this._streams || {};\n      let stream;\n      Object.keys(this._streams).forEach(streamid => {\n        const hasTrack = this._streams[streamid].getTracks()\n          .find(track => sender.track === track);\n        if (hasTrack) {\n          stream = this._streams[streamid];\n        }\n      });\n\n      if (stream) {\n        if (stream.getTracks().length === 1) {\n          // if this is the last track of the stream, remove the stream. This\n          // takes care of any shimmed _senders.\n          this.removeStream(this._reverseStreams[stream.id]);\n        } else {\n          // relying on the same odd chrome behaviour as above.\n          stream.removeTrack(sender.track);\n        }\n        this.dispatchEvent(new Event('negotiationneeded'));\n      }\n    };\n}\n\nexport function shimPeerConnection(window, browserDetails) {\n  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.webkitRTCPeerConnection;\n  }\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  // shim implicit creation of RTCSessionDescription/RTCIceCandidate\n  if (browserDetails.version < 53) {\n    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n        .forEach(function(method) {\n          const nativeMethod = window.RTCPeerConnection.prototype[method];\n          const methodObj = {[method]() {\n            arguments[0] = new ((method === 'addIceCandidate') ?\n                window.RTCIceCandidate :\n                window.RTCSessionDescription)(arguments[0]);\n            return nativeMethod.apply(this, arguments);\n          }};\n          window.RTCPeerConnection.prototype[method] = methodObj[method];\n        });\n  }\n}\n\n// Attempt to fix ONN in plan-b mode.\nexport function fixNegotiationNeeded(window, browserDetails) {\n  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', e => {\n    const pc = e.target;\n    if (browserDetails.version < 72 || (pc.getConfiguration &&\n        pc.getConfiguration().sdpSemantics === 'plan-b')) {\n      if (pc.signalingState !== 'stable') {\n        return;\n      }\n    }\n    return e;\n  });\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  const shimError_ = function(e) {\n    return {\n      name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint,\n      toString() {\n        return this.name;\n      }\n    };\n  };\n\n  // getUserMedia error shim.\n  const origGetUserMedia = navigator.mediaDevices.getUserMedia.\n      bind(navigator.mediaDevices);\n  navigator.mediaDevices.getUserMedia = function(c) {\n    return origGetUserMedia(c).catch(e => Promise.reject(shimError_(e)));\n  };\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window) {\n  if (!('getDisplayMedia' in window.navigator)) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    window.navigator.getDisplayMedia.bind(window.navigator);\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nimport {filterIceServers} from './filtericeservers';\nimport shimRTCPeerConnection from 'rtcpeerconnection-shim';\n\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimPeerConnection(window, browserDetails) {\n  if (window.RTCIceGatherer) {\n    if (!window.RTCIceCandidate) {\n      window.RTCIceCandidate = function RTCIceCandidate(args) {\n        return args;\n      };\n    }\n    if (!window.RTCSessionDescription) {\n      window.RTCSessionDescription = function RTCSessionDescription(args) {\n        return args;\n      };\n    }\n    // this adds an additional event listener to MediaStrackTrack that signals\n    // when a tracks enabled property was changed. Workaround for a bug in\n    // addStream, see below. No longer required in 15025+\n    if (browserDetails.version < 15025) {\n      const origMSTEnabled = Object.getOwnPropertyDescriptor(\n          window.MediaStreamTrack.prototype, 'enabled');\n      Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {\n        set(value) {\n          origMSTEnabled.set.call(this, value);\n          const ev = new Event('enabled');\n          ev.enabled = value;\n          this.dispatchEvent(ev);\n        }\n      });\n    }\n  }\n\n  // ORTC defines the DTMF sender a bit different.\n  // https://github.com/w3c/ortc/issues/714\n  if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = new window.RTCDtmfSender(this);\n          } else if (this.track.kind === 'video') {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n  // Edge currently only implements the RTCDtmfSender, not the\n  // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*\n  if (window.RTCDtmfSender && !window.RTCDTMFSender) {\n    window.RTCDTMFSender = window.RTCDtmfSender;\n  }\n\n  const RTCPeerConnectionShim = shimRTCPeerConnection(window,\n      browserDetails.version);\n  window.RTCPeerConnection = function RTCPeerConnection(config) {\n    if (config && config.iceServers) {\n      config.iceServers = filterIceServers(config.iceServers,\n        browserDetails.version);\n      utils.log('ICE servers after filtering:', config.iceServers);\n    }\n    return new RTCPeerConnectionShim(config);\n  };\n  window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;\n}\n\nexport function shimReplaceTrack(window) {\n  // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614\n  if (window.RTCRtpSender &&\n      !('replaceTrack' in window.RTCRtpSender.prototype)) {\n    window.RTCRtpSender.prototype.replaceTrack =\n        window.RTCRtpSender.prototype.setTrack;\n  }\n}\n","/*\n *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nexport function filterIceServers(iceServers, edgeVersion) {\n  let hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(server => {\n    if (server && (server.urls || server.url)) {\n      let urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n      }\n      const isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(url => {\n        // filter STUN unconditionally.\n        if (url.indexOf('stun:') === 0) {\n          return false;\n        }\n\n        const validTurn = url.startsWith('turn') &&\n            !url.startsWith('turn:[') &&\n            url.includes('transport=udp');\n        if (validTurn && !hasTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return validTurn && !hasTurn;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\n\nexport function shimGetUserMedia(window, browserDetails) {\n  const navigator = window && window.navigator;\n  const MediaStreamTrack = window && window.MediaStreamTrack;\n\n  navigator.getUserMedia = function(constraints, onSuccess, onError) {\n    // Replace Firefox 44+'s deprecation warning with unprefixed version.\n    utils.deprecated('navigator.getUserMedia',\n        'navigator.mediaDevices.getUserMedia');\n    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);\n  };\n\n  if (!(browserDetails.version > 55 &&\n      'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {\n    const remap = function(obj, a, b) {\n      if (a in obj && !(b in obj)) {\n        obj[b] = obj[a];\n        delete obj[a];\n      }\n    };\n\n    const nativeGetUserMedia = navigator.mediaDevices.getUserMedia.\n        bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function(c) {\n      if (typeof c === 'object' && typeof c.audio === 'object') {\n        c = JSON.parse(JSON.stringify(c));\n        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');\n        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');\n      }\n      return nativeGetUserMedia(c);\n    };\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {\n      const nativeGetSettings = MediaStreamTrack.prototype.getSettings;\n      MediaStreamTrack.prototype.getSettings = function() {\n        const obj = nativeGetSettings.apply(this, arguments);\n        remap(obj, 'mozAutoGainControl', 'autoGainControl');\n        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');\n        return obj;\n      };\n    }\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {\n      const nativeApplyConstraints =\n        MediaStreamTrack.prototype.applyConstraints;\n      MediaStreamTrack.prototype.applyConstraints = function(c) {\n        if (this.kind === 'audio' && typeof c === 'object') {\n          c = JSON.parse(JSON.stringify(c));\n          remap(c, 'autoGainControl', 'mozAutoGainControl');\n          remap(c, 'noiseSuppression', 'mozNoiseSuppression');\n        }\n        return nativeApplyConstraints.apply(this, [c]);\n      };\n    }\n  }\n}\n","/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nexport function shimGetDisplayMedia(window, preferredMediaSource) {\n  if (window.navigator.mediaDevices &&\n    'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!(window.navigator.mediaDevices)) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia =\n    function getDisplayMedia(constraints) {\n      if (!(constraints && constraints.video)) {\n        const err = new DOMException('getDisplayMedia without video ' +\n            'constraints is undefined');\n        err.name = 'NotFoundError';\n        // from https://heycam.github.io/webidl/#idl-DOMException-error-names\n        err.code = 8;\n        return Promise.reject(err);\n      }\n      if (constraints.video === true) {\n        constraints.video = {mediaSource: preferredMediaSource};\n      } else {\n        constraints.video.mediaSource = preferredMediaSource;\n      }\n      return window.navigator.mediaDevices.getUserMedia(constraints);\n    };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport * as utils from '../utils';\nexport {shimGetUserMedia} from './getusermedia';\nexport {shimGetDisplayMedia} from './getdisplaymedia';\n\nexport function shimOnTrack(window) {\n  if (typeof window === 'object' && window.RTCTrackEvent &&\n      ('receiver' in window.RTCTrackEvent.prototype) &&\n      !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimPeerConnection(window, browserDetails) {\n  if (typeof window !== 'object' ||\n      !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {\n    return; // probably media.peerconnection.enabled=false in about:config\n  }\n  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.mozRTCPeerConnection;\n  }\n\n  if (browserDetails.version < 53) {\n    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.\n    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n        .forEach(function(method) {\n          const nativeMethod = window.RTCPeerConnection.prototype[method];\n          const methodObj = {[method]() {\n            arguments[0] = new ((method === 'addIceCandidate') ?\n                window.RTCIceCandidate :\n                window.RTCSessionDescription)(arguments[0]);\n            return nativeMethod.apply(this, arguments);\n          }};\n          window.RTCPeerConnection.prototype[method] = methodObj[method];\n        });\n  }\n\n  const modernStatsTypes = {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  };\n\n  const nativeGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    const [selector, onSucc, onErr] = arguments;\n    return nativeGetStats.apply(this, [selector || null])\n      .then(stats => {\n        if (browserDetails.version < 53 && !onSucc) {\n          // Shim only promise getStats with spec-hyphens in type names\n          // Leave callback version alone; misc old uses of forEach before Map\n          try {\n            stats.forEach(stat => {\n              stat.type = modernStatsTypes[stat.type] || stat.type;\n            });\n          } catch (e) {\n            if (e.name !== 'TypeError') {\n              throw e;\n            }\n            // Avoid TypeError: \"type\" is read-only, in old versions. 34-43ish\n            stats.forEach((stat, i) => {\n              stats.set(i, Object.assign({}, stat, {\n                type: modernStatsTypes[stat.type] || stat.type\n              }));\n            });\n          }\n        }\n        return stats;\n      })\n      .then(onSucc, onErr);\n  };\n}\n\nexport function shimSenderGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {\n    return;\n  }\n  const origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n  if (origGetSenders) {\n    window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n      const senders = origGetSenders.apply(this, []);\n      senders.forEach(sender => sender._pc = this);\n      return senders;\n    };\n  }\n\n  const origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  if (origAddTrack) {\n    window.RTCPeerConnection.prototype.addTrack = function addTrack() {\n      const sender = origAddTrack.apply(this, arguments);\n      sender._pc = this;\n      return sender;\n    };\n  }\n  window.RTCRtpSender.prototype.getStats = function getStats() {\n    return this.track ? this._pc.getStats(this.track) :\n        Promise.resolve(new Map());\n  };\n}\n\nexport function shimReceiverGetStats(window) {\n  if (!(typeof window === 'object' && window.RTCPeerConnection &&\n      window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {\n    return;\n  }\n  const origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n  if (origGetReceivers) {\n    window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {\n      const receivers = origGetReceivers.apply(this, []);\n      receivers.forEach(receiver => receiver._pc = this);\n      return receivers;\n    };\n  }\n  utils.wrapPeerConnectionEvent(window, 'track', e => {\n    e.receiver._pc = e.srcElement;\n    return e;\n  });\n  window.RTCRtpReceiver.prototype.getStats = function getStats() {\n    return this._pc.getStats(this.track);\n  };\n}\n\nexport function shimRemoveStream(window) {\n  if (!window.RTCPeerConnection ||\n      'removeStream' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  window.RTCPeerConnection.prototype.removeStream =\n    function removeStream(stream) {\n      utils.deprecated('removeStream', 'removeTrack');\n      this.getSenders().forEach(sender => {\n        if (sender.track && stream.getTracks().includes(sender.track)) {\n          this.removeTrack(sender);\n        }\n      });\n    };\n}\n\nexport function shimRTCDataChannel(window) {\n  // rename DataChannel to RTCDataChannel (native fix in FF60):\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851\n  if (window.DataChannel && !window.RTCDataChannel) {\n    window.RTCDataChannel = window.DataChannel;\n  }\n}\n\nexport function shimAddTransceiver(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!(typeof window === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  const origAddTransceiver = window.RTCPeerConnection.prototype.addTransceiver;\n  if (origAddTransceiver) {\n    window.RTCPeerConnection.prototype.addTransceiver =\n      function addTransceiver() {\n        this.setParametersPromises = [];\n        const initParameters = arguments[1];\n        const shouldPerformCheck = initParameters &&\n                                  'sendEncodings' in initParameters;\n        if (shouldPerformCheck) {\n          // If sendEncodings params are provided, validate grammar\n          initParameters.sendEncodings.forEach((encodingParam) => {\n            if ('rid' in encodingParam) {\n              const ridRegex = /^[a-z0-9]{0,16}$/i;\n              if (!ridRegex.test(encodingParam.rid)) {\n                throw new TypeError('Invalid RID value provided.');\n              }\n            }\n            if ('scaleResolutionDownBy' in encodingParam) {\n              if (!(parseFloat(encodingParam.scaleResolutionDownBy) >= 1.0)) {\n                throw new RangeError('scale_resolution_down_by must be >= 1.0');\n              }\n            }\n            if ('maxFramerate' in encodingParam) {\n              if (!(parseFloat(encodingParam.maxFramerate) >= 0)) {\n                throw new RangeError('max_framerate must be >= 0.0');\n              }\n            }\n          });\n        }\n        const transceiver = origAddTransceiver.apply(this, arguments);\n        if (shouldPerformCheck) {\n          // Check if the init options were applied. If not we do this in an\n          // asynchronous way and save the promise reference in a global object.\n          // This is an ugly hack, but at the same time is way more robust than\n          // checking the sender parameters before and after the createOffer\n          // Also note that after the createoffer we are not 100% sure that\n          // the params were asynchronously applied so we might miss the\n          // opportunity to recreate offer.\n          const {sender} = transceiver;\n          const params = sender.getParameters();\n          if (!('encodings' in params) ||\n              // Avoid being fooled by patched getParameters() below.\n              (params.encodings.length === 1 &&\n               Object.keys(params.encodings[0]).length === 0)) {\n            params.encodings = initParameters.sendEncodings;\n            sender.sendEncodings = initParameters.sendEncodings;\n            this.setParametersPromises.push(sender.setParameters(params)\n              .then(() => {\n                delete sender.sendEncodings;\n              }).catch(() => {\n                delete sender.sendEncodings;\n              })\n            );\n          }\n        }\n        return transceiver;\n      };\n  }\n}\n\nexport function shimGetParameters(window) {\n  if (!(typeof window === 'object' && window.RTCRtpSender)) {\n    return;\n  }\n  const origGetParameters = window.RTCRtpSender.prototype.getParameters;\n  if (origGetParameters) {\n    window.RTCRtpSender.prototype.getParameters =\n      function getParameters() {\n        const params = origGetParameters.apply(this, arguments);\n        if (!('encodings' in params)) {\n          params.encodings = [].concat(this.sendEncodings || [{}]);\n        }\n        return params;\n      };\n  }\n}\n\nexport function shimCreateOffer(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!(typeof window === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  const origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer = function createOffer() {\n    if (this.setParametersPromises && this.setParametersPromises.length) {\n      return Promise.all(this.setParametersPromises)\n      .then(() => {\n        return origCreateOffer.apply(this, arguments);\n      })\n      .finally(() => {\n        this.setParametersPromises = [];\n      });\n    }\n    return origCreateOffer.apply(this, arguments);\n  };\n}\n\nexport function shimCreateAnswer(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!(typeof window === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  const origCreateAnswer = window.RTCPeerConnection.prototype.createAnswer;\n  window.RTCPeerConnection.prototype.createAnswer = function createAnswer() {\n    if (this.setParametersPromises && this.setParametersPromises.length) {\n      return Promise.all(this.setParametersPromises)\n      .then(() => {\n        return origCreateAnswer.apply(this, arguments);\n      })\n      .finally(() => {\n        this.setParametersPromises = [];\n      });\n    }\n    return origCreateAnswer.apply(this, arguments);\n  };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n'use strict';\nimport * as utils from '../utils';\n\nexport function shimLocalStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getLocalStreams =\n      function getLocalStreams() {\n        if (!this._localStreams) {\n          this._localStreams = [];\n        }\n        return this._localStreams;\n      };\n  }\n  if (!('addStream' in window.RTCPeerConnection.prototype)) {\n    const _addTrack = window.RTCPeerConnection.prototype.addTrack;\n    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      if (!this._localStreams.includes(stream)) {\n        this._localStreams.push(stream);\n      }\n      // Try to emulate Chrome's behaviour of adding in audio-video order.\n      // Safari orders by track id.\n      stream.getAudioTracks().forEach(track => _addTrack.call(this, track,\n        stream));\n      stream.getVideoTracks().forEach(track => _addTrack.call(this, track,\n        stream));\n    };\n\n    window.RTCPeerConnection.prototype.addTrack =\n      function addTrack(track, ...streams) {\n        if (streams) {\n          streams.forEach((stream) => {\n            if (!this._localStreams) {\n              this._localStreams = [stream];\n            } else if (!this._localStreams.includes(stream)) {\n              this._localStreams.push(stream);\n            }\n          });\n        }\n        return _addTrack.apply(this, arguments);\n      };\n  }\n  if (!('removeStream' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.removeStream =\n      function removeStream(stream) {\n        if (!this._localStreams) {\n          this._localStreams = [];\n        }\n        const index = this._localStreams.indexOf(stream);\n        if (index === -1) {\n          return;\n        }\n        this._localStreams.splice(index, 1);\n        const tracks = stream.getTracks();\n        this.getSenders().forEach(sender => {\n          if (tracks.includes(sender.track)) {\n            this.removeTrack(sender);\n          }\n        });\n      };\n  }\n}\n\nexport function shimRemoteStreamsAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getRemoteStreams =\n      function getRemoteStreams() {\n        return this._remoteStreams ? this._remoteStreams : [];\n      };\n  }\n  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {\n      get() {\n        return this._onaddstream;\n      },\n      set(f) {\n        if (this._onaddstream) {\n          this.removeEventListener('addstream', this._onaddstream);\n          this.removeEventListener('track', this._onaddstreampoly);\n        }\n        this.addEventListener('addstream', this._onaddstream = f);\n        this.addEventListener('track', this._onaddstreampoly = (e) => {\n          e.streams.forEach(stream => {\n            if (!this._remoteStreams) {\n              this._remoteStreams = [];\n            }\n            if (this._remoteStreams.includes(stream)) {\n              return;\n            }\n            this._remoteStreams.push(stream);\n            const event = new Event('addstream');\n            event.stream = stream;\n            this.dispatchEvent(event);\n          });\n        });\n      }\n    });\n    const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription =\n      function setRemoteDescription() {\n        const pc = this;\n        if (!this._onaddstreampoly) {\n          this.addEventListener('track', this._onaddstreampoly = function(e) {\n            e.streams.forEach(stream => {\n              if (!pc._remoteStreams) {\n                pc._remoteStreams = [];\n              }\n              if (pc._remoteStreams.indexOf(stream) >= 0) {\n                return;\n              }\n              pc._remoteStreams.push(stream);\n              const event = new Event('addstream');\n              event.stream = stream;\n              pc.dispatchEvent(event);\n            });\n          });\n        }\n        return origSetRemoteDescription.apply(pc, arguments);\n      };\n  }\n}\n\nexport function shimCallbacksAPI(window) {\n  if (typeof window !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  const prototype = window.RTCPeerConnection.prototype;\n  const origCreateOffer = prototype.createOffer;\n  const origCreateAnswer = prototype.createAnswer;\n  const setLocalDescription = prototype.setLocalDescription;\n  const setRemoteDescription = prototype.setRemoteDescription;\n  const addIceCandidate = prototype.addIceCandidate;\n\n  prototype.createOffer =\n    function createOffer(successCallback, failureCallback) {\n      const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n      const promise = origCreateOffer.apply(this, [options]);\n      if (!failureCallback) {\n        return promise;\n      }\n      promise.then(successCallback, failureCallback);\n      return Promise.resolve();\n    };\n\n  prototype.createAnswer =\n    function createAnswer(successCallback, failureCallback) {\n      const options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n      const promise = origCreateAnswer.apply(this, [options]);\n      if (!failureCallback) {\n        return promise;\n      }\n      promise.then(successCallback, failureCallback);\n      return Promise.resolve();\n    };\n\n  let withCallback = function(description, successCallback, failureCallback) {\n    const promise = setLocalDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setLocalDescription = withCallback;\n\n  withCallback = function(description, successCallback, failureCallback) {\n    const promise = setRemoteDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setRemoteDescription = withCallback;\n\n  withCallback = function(candidate, successCallback, failureCallback) {\n    const promise = addIceCandidate.apply(this, [candidate]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.addIceCandidate = withCallback;\n}\n\nexport function shimGetUserMedia(window) {\n  const navigator = window && window.navigator;\n\n  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {\n    // shim not needed in Safari 12.1\n    const mediaDevices = navigator.mediaDevices;\n    const _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);\n    navigator.mediaDevices.getUserMedia = (constraints) => {\n      return _getUserMedia(shimConstraints(constraints));\n    };\n  }\n\n  if (!navigator.getUserMedia && navigator.mediaDevices &&\n    navigator.mediaDevices.getUserMedia) {\n    navigator.getUserMedia = function getUserMedia(constraints, cb, errcb) {\n      navigator.mediaDevices.getUserMedia(constraints)\n      .then(cb, errcb);\n    }.bind(navigator);\n  }\n}\n\nexport function shimConstraints(constraints) {\n  if (constraints && constraints.video !== undefined) {\n    return Object.assign({},\n      constraints,\n      {video: utils.compactObject(constraints.video)}\n    );\n  }\n\n  return constraints;\n}\n\nexport function shimRTCIceServerUrls(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  // migrate from non-spec RTCIceServer.url to RTCIceServer.urls\n  const OrigPeerConnection = window.RTCPeerConnection;\n  window.RTCPeerConnection =\n    function RTCPeerConnection(pcConfig, pcConstraints) {\n      if (pcConfig && pcConfig.iceServers) {\n        const newIceServers = [];\n        for (let i = 0; i < pcConfig.iceServers.length; i++) {\n          let server = pcConfig.iceServers[i];\n          if (!server.hasOwnProperty('urls') &&\n              server.hasOwnProperty('url')) {\n            utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n            server = JSON.parse(JSON.stringify(server));\n            server.urls = server.url;\n            delete server.url;\n            newIceServers.push(server);\n          } else {\n            newIceServers.push(pcConfig.iceServers[i]);\n          }\n        }\n        pcConfig.iceServers = newIceServers;\n      }\n      return new OrigPeerConnection(pcConfig, pcConstraints);\n    };\n  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;\n  // wrap static methods. Currently just generateCertificate.\n  if ('generateCertificate' in OrigPeerConnection) {\n    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n      get() {\n        return OrigPeerConnection.generateCertificate;\n      }\n    });\n  }\n}\n\nexport function shimTrackEventTransceiver(window) {\n  // Add event.transceiver member over deprecated event.receiver\n  if (typeof window === 'object' && window.RTCTrackEvent &&\n      'receiver' in window.RTCTrackEvent.prototype &&\n      !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get() {\n        return {receiver: this.receiver};\n      }\n    });\n  }\n}\n\nexport function shimCreateOfferLegacy(window) {\n  const origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer =\n    function createOffer(offerOptions) {\n      if (offerOptions) {\n        if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {\n          // support bit values\n          offerOptions.offerToReceiveAudio =\n            !!offerOptions.offerToReceiveAudio;\n        }\n        const audioTransceiver = this.getTransceivers().find(transceiver =>\n          transceiver.receiver.track.kind === 'audio');\n        if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {\n          if (audioTransceiver.direction === 'sendrecv') {\n            if (audioTransceiver.setDirection) {\n              audioTransceiver.setDirection('sendonly');\n            } else {\n              audioTransceiver.direction = 'sendonly';\n            }\n          } else if (audioTransceiver.direction === 'recvonly') {\n            if (audioTransceiver.setDirection) {\n              audioTransceiver.setDirection('inactive');\n            } else {\n              audioTransceiver.direction = 'inactive';\n            }\n          }\n        } else if (offerOptions.offerToReceiveAudio === true &&\n            !audioTransceiver) {\n          this.addTransceiver('audio');\n        }\n\n        if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {\n          // support bit values\n          offerOptions.offerToReceiveVideo =\n            !!offerOptions.offerToReceiveVideo;\n        }\n        const videoTransceiver = this.getTransceivers().find(transceiver =>\n          transceiver.receiver.track.kind === 'video');\n        if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {\n          if (videoTransceiver.direction === 'sendrecv') {\n            if (videoTransceiver.setDirection) {\n              videoTransceiver.setDirection('sendonly');\n            } else {\n              videoTransceiver.direction = 'sendonly';\n            }\n          } else if (videoTransceiver.direction === 'recvonly') {\n            if (videoTransceiver.setDirection) {\n              videoTransceiver.setDirection('inactive');\n            } else {\n              videoTransceiver.direction = 'inactive';\n            }\n          }\n        } else if (offerOptions.offerToReceiveVideo === true &&\n            !videoTransceiver) {\n          this.addTransceiver('video');\n        }\n      }\n      return origCreateOffer.apply(this, arguments);\n    };\n}\n\nexport function shimAudioContext(window) {\n  if (typeof window !== 'object' || window.AudioContext) {\n    return;\n  }\n  window.AudioContext = window.webkitAudioContext;\n}\n","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nimport SDPUtils from 'sdp';\nimport * as utils from './utils';\n\nexport function shimRTCIceCandidate(window) {\n  // foundation is arbitrarily chosen as an indicator for full support for\n  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface\n  if (!window.RTCIceCandidate || (window.RTCIceCandidate && 'foundation' in\n      window.RTCIceCandidate.prototype)) {\n    return;\n  }\n\n  const NativeRTCIceCandidate = window.RTCIceCandidate;\n  window.RTCIceCandidate = function RTCIceCandidate(args) {\n    // Remove the a= which shouldn't be part of the candidate string.\n    if (typeof args === 'object' && args.candidate &&\n        args.candidate.indexOf('a=') === 0) {\n      args = JSON.parse(JSON.stringify(args));\n      args.candidate = args.candidate.substr(2);\n    }\n\n    if (args.candidate && args.candidate.length) {\n      // Augment the native candidate with the parsed fields.\n      const nativeCandidate = new NativeRTCIceCandidate(args);\n      const parsedCandidate = SDPUtils.parseCandidate(args.candidate);\n      const augmentedCandidate = Object.assign(nativeCandidate,\n          parsedCandidate);\n\n      // Add a serializer that does not serialize the extra attributes.\n      augmentedCandidate.toJSON = function toJSON() {\n        return {\n          candidate: augmentedCandidate.candidate,\n          sdpMid: augmentedCandidate.sdpMid,\n          sdpMLineIndex: augmentedCandidate.sdpMLineIndex,\n          usernameFragment: augmentedCandidate.usernameFragment,\n        };\n      };\n      return augmentedCandidate;\n    }\n    return new NativeRTCIceCandidate(args);\n  };\n  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;\n\n  // Hook up the augmented candidate in onicecandidate and\n  // addEventListener('icecandidate', ...)\n  utils.wrapPeerConnectionEvent(window, 'icecandidate', e => {\n    if (e.candidate) {\n      Object.defineProperty(e, 'candidate', {\n        value: new window.RTCIceCandidate(e.candidate),\n        writable: 'false'\n      });\n    }\n    return e;\n  });\n}\n\nexport function shimMaxMessageSize(window, browserDetails) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  if (!('sctp' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {\n      get() {\n        return typeof this._sctp === 'undefined' ? null : this._sctp;\n      }\n    });\n  }\n\n  const sctpInDescription = function(description) {\n    if (!description || !description.sdp) {\n      return false;\n    }\n    const sections = SDPUtils.splitSections(description.sdp);\n    sections.shift();\n    return sections.some(mediaSection => {\n      const mLine = SDPUtils.parseMLine(mediaSection);\n      return mLine && mLine.kind === 'application'\n          && mLine.protocol.indexOf('SCTP') !== -1;\n    });\n  };\n\n  const getRemoteFirefoxVersion = function(description) {\n    // TODO: Is there a better solution for detecting Firefox?\n    const match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\\d+)/);\n    if (match === null || match.length < 2) {\n      return -1;\n    }\n    const version = parseInt(match[1], 10);\n    // Test for NaN (yes, this is ugly)\n    return version !== version ? -1 : version;\n  };\n\n  const getCanSendMaxMessageSize = function(remoteIsFirefox) {\n    // Every implementation we know can send at least 64 KiB.\n    // Note: Although Chrome is technically able to send up to 256 KiB, the\n    //       data does not reach the other peer reliably.\n    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419\n    let canSendMaxMessageSize = 65536;\n    if (browserDetails.browser === 'firefox') {\n      if (browserDetails.version < 57) {\n        if (remoteIsFirefox === -1) {\n          // FF < 57 will send in 16 KiB chunks using the deprecated PPID\n          // fragmentation.\n          canSendMaxMessageSize = 16384;\n        } else {\n          // However, other FF (and RAWRTC) can reassemble PPID-fragmented\n          // messages. Thus, supporting ~2 GiB when sending.\n          canSendMaxMessageSize = 2147483637;\n        }\n      } else if (browserDetails.version < 60) {\n        // Currently, all FF >= 57 will reset the remote maximum message size\n        // to the default value when a data channel is created at a later\n        // stage. :(\n        // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n        canSendMaxMessageSize =\n          browserDetails.version === 57 ? 65535 : 65536;\n      } else {\n        // FF >= 60 supports sending ~2 GiB\n        canSendMaxMessageSize = 2147483637;\n      }\n    }\n    return canSendMaxMessageSize;\n  };\n\n  const getMaxMessageSize = function(description, remoteIsFirefox) {\n    // Note: 65536 bytes is the default value from the SDP spec. Also,\n    //       every implementation we know supports receiving 65536 bytes.\n    let maxMessageSize = 65536;\n\n    // FF 57 has a slightly incorrect default remote max message size, so\n    // we need to adjust it here to avoid a failure when sending.\n    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697\n    if (browserDetails.browser === 'firefox'\n         && browserDetails.version === 57) {\n      maxMessageSize = 65535;\n    }\n\n    const match = SDPUtils.matchPrefix(description.sdp,\n      'a=max-message-size:');\n    if (match.length > 0) {\n      maxMessageSize = parseInt(match[0].substr(19), 10);\n    } else if (browserDetails.browser === 'firefox' &&\n                remoteIsFirefox !== -1) {\n      // If the maximum message size is not present in the remote SDP and\n      // both local and remote are Firefox, the remote peer can receive\n      // ~2 GiB.\n      maxMessageSize = 2147483637;\n    }\n    return maxMessageSize;\n  };\n\n  const origSetRemoteDescription =\n      window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription =\n    function setRemoteDescription() {\n      this._sctp = null;\n      // Chrome decided to not expose .sctp in plan-b mode.\n      // As usual, adapter.js has to do an 'ugly worakaround'\n      // to cover up the mess.\n      if (browserDetails.browser === 'chrome' && browserDetails.version >= 76) {\n        const {sdpSemantics} = this.getConfiguration();\n        if (sdpSemantics === 'plan-b') {\n          Object.defineProperty(this, 'sctp', {\n            get() {\n              return typeof this._sctp === 'undefined' ? null : this._sctp;\n            },\n            enumerable: true,\n            configurable: true,\n          });\n        }\n      }\n\n      if (sctpInDescription(arguments[0])) {\n        // Check if the remote is FF.\n        const isFirefox = getRemoteFirefoxVersion(arguments[0]);\n\n        // Get the maximum message size the local peer is capable of sending\n        const canSendMMS = getCanSendMaxMessageSize(isFirefox);\n\n        // Get the maximum message size of the remote peer.\n        const remoteMMS = getMaxMessageSize(arguments[0], isFirefox);\n\n        // Determine final maximum message size\n        let maxMessageSize;\n        if (canSendMMS === 0 && remoteMMS === 0) {\n          maxMessageSize = Number.POSITIVE_INFINITY;\n        } else if (canSendMMS === 0 || remoteMMS === 0) {\n          maxMessageSize = Math.max(canSendMMS, remoteMMS);\n        } else {\n          maxMessageSize = Math.min(canSendMMS, remoteMMS);\n        }\n\n        // Create a dummy RTCSctpTransport object and the 'maxMessageSize'\n        // attribute.\n        const sctp = {};\n        Object.defineProperty(sctp, 'maxMessageSize', {\n          get() {\n            return maxMessageSize;\n          }\n        });\n        this._sctp = sctp;\n      }\n\n      return origSetRemoteDescription.apply(this, arguments);\n    };\n}\n\nexport function shimSendThrowTypeError(window) {\n  if (!(window.RTCPeerConnection &&\n      'createDataChannel' in window.RTCPeerConnection.prototype)) {\n    return;\n  }\n\n  // Note: Although Firefox >= 57 has a native implementation, the maximum\n  //       message size can be reset for all data channels at a later stage.\n  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n\n  function wrapDcSend(dc, pc) {\n    const origDataChannelSend = dc.send;\n    dc.send = function send() {\n      const data = arguments[0];\n      const length = data.length || data.size || data.byteLength;\n      if (dc.readyState === 'open' &&\n          pc.sctp && length > pc.sctp.maxMessageSize) {\n        throw new TypeError('Message too large (can send a maximum of ' +\n          pc.sctp.maxMessageSize + ' bytes)');\n      }\n      return origDataChannelSend.apply(dc, arguments);\n    };\n  }\n  const origCreateDataChannel =\n    window.RTCPeerConnection.prototype.createDataChannel;\n  window.RTCPeerConnection.prototype.createDataChannel =\n    function createDataChannel() {\n      const dataChannel = origCreateDataChannel.apply(this, arguments);\n      wrapDcSend(dataChannel, this);\n      return dataChannel;\n    };\n  utils.wrapPeerConnectionEvent(window, 'datachannel', e => {\n    wrapDcSend(e.channel, e.target);\n    return e;\n  });\n}\n\n\n/* shims RTCConnectionState by pretending it is the same as iceConnectionState.\n * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12\n * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect\n * since DTLS failures would be hidden. See\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827\n * for the Firefox tracking bug.\n */\nexport function shimConnectionState(window) {\n  if (!window.RTCPeerConnection ||\n      'connectionState' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  const proto = window.RTCPeerConnection.prototype;\n  Object.defineProperty(proto, 'connectionState', {\n    get() {\n      return {\n        completed: 'connected',\n        checking: 'connecting'\n      }[this.iceConnectionState] || this.iceConnectionState;\n    },\n    enumerable: true,\n    configurable: true\n  });\n  Object.defineProperty(proto, 'onconnectionstatechange', {\n    get() {\n      return this._onconnectionstatechange || null;\n    },\n    set(cb) {\n      if (this._onconnectionstatechange) {\n        this.removeEventListener('connectionstatechange',\n            this._onconnectionstatechange);\n        delete this._onconnectionstatechange;\n      }\n      if (cb) {\n        this.addEventListener('connectionstatechange',\n            this._onconnectionstatechange = cb);\n      }\n    },\n    enumerable: true,\n    configurable: true\n  });\n\n  ['setLocalDescription', 'setRemoteDescription'].forEach((method) => {\n    const origMethod = proto[method];\n    proto[method] = function() {\n      if (!this._connectionstatechangepoly) {\n        this._connectionstatechangepoly = e => {\n          const pc = e.target;\n          if (pc._lastConnectionState !== pc.connectionState) {\n            pc._lastConnectionState = pc.connectionState;\n            const newEvent = new Event('connectionstatechange', e);\n            pc.dispatchEvent(newEvent);\n          }\n          return e;\n        };\n        this.addEventListener('iceconnectionstatechange',\n          this._connectionstatechangepoly);\n      }\n      return origMethod.apply(this, arguments);\n    };\n  });\n}\n\nexport function removeExtmapAllowMixed(window, browserDetails) {\n  /* remove a=extmap-allow-mixed for webrtc.org < M71 */\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {\n    return;\n  }\n  if (browserDetails.browser === 'safari' && browserDetails.version >= 605) {\n    return;\n  }\n  const nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription =\n  function setRemoteDescription(desc) {\n    if (desc && desc.sdp && desc.sdp.indexOf('\\na=extmap-allow-mixed') !== -1) {\n      const sdp = desc.sdp.split('\\n').filter((line) => {\n        return line.trim() !== 'a=extmap-allow-mixed';\n      }).join('\\n');\n      // Safari enforces read-only-ness of RTCSessionDescription fields.\n      if (window.RTCSessionDescription &&\n          desc instanceof window.RTCSessionDescription) {\n        arguments[0] = new window.RTCSessionDescription({\n          type: desc.type,\n          sdp,\n        });\n      } else {\n        desc.sdp = sdp;\n      }\n    }\n    return nativeSRD.apply(this, arguments);\n  };\n}\n\nexport function shimAddIceCandidateNullOrEmpty(window, browserDetails) {\n  // Support for addIceCandidate(null or undefined)\n  // as well as addIceCandidate({candidate: \"\", ...})\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=978582\n  // Note: must be called before other polyfills which change the signature.\n  if (!(window.RTCPeerConnection && window.RTCPeerConnection.prototype)) {\n    return;\n  }\n  const nativeAddIceCandidate =\n      window.RTCPeerConnection.prototype.addIceCandidate;\n  if (!nativeAddIceCandidate || nativeAddIceCandidate.length === 0) {\n    return;\n  }\n  window.RTCPeerConnection.prototype.addIceCandidate =\n    function addIceCandidate() {\n      if (!arguments[0]) {\n        if (arguments[1]) {\n          arguments[1].apply(null);\n        }\n        return Promise.resolve();\n      }\n      // Firefox 68+ emits and processes {candidate: \"\", ...}, ignore\n      // in older versions.\n      // Native support for ignoring exists for Chrome M77+.\n      // Safari ignores as well, exact version unknown but works in the same\n      // version that also ignores addIceCandidate(null).\n      if (((browserDetails.browser === 'chrome' && browserDetails.version < 78)\n           || (browserDetails.browser === 'firefox'\n               && browserDetails.version < 68)\n           || (browserDetails.browser === 'safari'))\n          && arguments[0] && arguments[0].candidate === '') {\n        return Promise.resolve();\n      }\n      return nativeAddIceCandidate.apply(this, arguments);\n    };\n}\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n\n'use strict';\n\nimport {adapterFactory} from './adapter_factory.js';\n\nconst adapter =\n  adapterFactory({window: typeof window === 'undefined' ? undefined : window});\nexport default adapter;\n","/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\nimport * as utils from './utils';\n\n  // Browser shims.\nimport * as chromeShim from './chrome/chrome_shim';\nimport * as edgeShim from './edge/edge_shim';\nimport * as firefoxShim from './firefox/firefox_shim';\nimport * as safariShim from './safari/safari_shim';\nimport * as commonShim from './common_shim';\n\n// Shimming starts here.\nexport function adapterFactory({window} = {}, options = {\n  shimChrome: true,\n  shimFirefox: true,\n  shimEdge: true,\n  shimSafari: true,\n}) {\n  // Utils.\n  const logging = utils.log;\n  const browserDetails = utils.detectBrowser(window);\n\n  const adapter = {\n    browserDetails,\n    commonShim,\n    extractVersion: utils.extractVersion,\n    disableLog: utils.disableLog,\n    disableWarnings: utils.disableWarnings\n  };\n\n  // Shim browser if found.\n  switch (browserDetails.browser) {\n    case 'chrome':\n      if (!chromeShim || !chromeShim.shimPeerConnection ||\n          !options.shimChrome) {\n        logging('Chrome shim is not included in this adapter release.');\n        return adapter;\n      }\n      if (browserDetails.version === null) {\n        logging('Chrome shim can not determine version, not shimming.');\n        return adapter;\n      }\n      logging('adapter.js shimming chrome.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = chromeShim;\n\n      // Must be called before shimPeerConnection.\n      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);\n\n      chromeShim.shimGetUserMedia(window, browserDetails);\n      chromeShim.shimMediaStream(window, browserDetails);\n      chromeShim.shimPeerConnection(window, browserDetails);\n      chromeShim.shimOnTrack(window, browserDetails);\n      chromeShim.shimAddTrackRemoveTrack(window, browserDetails);\n      chromeShim.shimGetSendersWithDtmf(window, browserDetails);\n      chromeShim.shimGetStats(window, browserDetails);\n      chromeShim.shimSenderReceiverGetStats(window, browserDetails);\n      chromeShim.fixNegotiationNeeded(window, browserDetails);\n\n      commonShim.shimRTCIceCandidate(window, browserDetails);\n      commonShim.shimConnectionState(window, browserDetails);\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      commonShim.removeExtmapAllowMixed(window, browserDetails);\n      break;\n    case 'firefox':\n      if (!firefoxShim || !firefoxShim.shimPeerConnection ||\n          !options.shimFirefox) {\n        logging('Firefox shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming firefox.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = firefoxShim;\n\n      // Must be called before shimPeerConnection.\n      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);\n\n      firefoxShim.shimGetUserMedia(window, browserDetails);\n      firefoxShim.shimPeerConnection(window, browserDetails);\n      firefoxShim.shimOnTrack(window, browserDetails);\n      firefoxShim.shimRemoveStream(window, browserDetails);\n      firefoxShim.shimSenderGetStats(window, browserDetails);\n      firefoxShim.shimReceiverGetStats(window, browserDetails);\n      firefoxShim.shimRTCDataChannel(window, browserDetails);\n      firefoxShim.shimAddTransceiver(window, browserDetails);\n      firefoxShim.shimGetParameters(window, browserDetails);\n      firefoxShim.shimCreateOffer(window, browserDetails);\n      firefoxShim.shimCreateAnswer(window, browserDetails);\n\n      commonShim.shimRTCIceCandidate(window, browserDetails);\n      commonShim.shimConnectionState(window, browserDetails);\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      break;\n    case 'edge':\n      if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {\n        logging('MS edge shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming edge.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = edgeShim;\n\n      edgeShim.shimGetUserMedia(window, browserDetails);\n      edgeShim.shimGetDisplayMedia(window, browserDetails);\n      edgeShim.shimPeerConnection(window, browserDetails);\n      edgeShim.shimReplaceTrack(window, browserDetails);\n\n      // the edge shim implements the full RTCIceCandidate object.\n\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      break;\n    case 'safari':\n      if (!safariShim || !options.shimSafari) {\n        logging('Safari shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming safari.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = safariShim;\n\n      // Must be called before shimCallbackAPI.\n      commonShim.shimAddIceCandidateNullOrEmpty(window, browserDetails);\n\n      safariShim.shimRTCIceServerUrls(window, browserDetails);\n      safariShim.shimCreateOfferLegacy(window, browserDetails);\n      safariShim.shimCallbacksAPI(window, browserDetails);\n      safariShim.shimLocalStreamsAPI(window, browserDetails);\n      safariShim.shimRemoteStreamsAPI(window, browserDetails);\n      safariShim.shimTrackEventTransceiver(window, browserDetails);\n      safariShim.shimGetUserMedia(window, browserDetails);\n      safariShim.shimAudioContext(window, browserDetails);\n\n      commonShim.shimRTCIceCandidate(window, browserDetails);\n      commonShim.shimMaxMessageSize(window, browserDetails);\n      commonShim.shimSendThrowTypeError(window, browserDetails);\n      commonShim.removeExtmapAllowMixed(window, browserDetails);\n      break;\n    default:\n      logging('Unsupported browser!');\n      break;\n  }\n\n  return adapter;\n}\n","\"use strict\";\n\n/**\n * From https://gist.github.com/nolanlawson/10340255\n */\nmodule.exports = function createBlob(parts, properties) {\n  parts = parts || [];\n  properties = properties || {};\n  try {\n    return new Blob(parts, properties);\n  } catch (e) {\n    if (e.name !== \"TypeError\") {\n      throw e;\n    }\n    var BlobBuilder = window.BlobBuilder || window.MSBlobBuilder || window.MozBlobBuilder || window.WebKitBlobBuilder;\n    var builder = new BlobBuilder();\n    for (var i = 0; i < parts.length; i += 1) {\n      builder.append(parts[i]);\n    }\n    return builder.getBlob(properties.type);\n  }\n};","'use strict';\n\nfunction NoVideoInputDevicesError() {\n  this.name = 'NoVideoInputDevicesError';\n  this.message = 'No video input devices found';\n}\nNoVideoInputDevicesError.prototype = new Error();\n\nmodule.exports = {\n  NoVideoInputDevicesError: NoVideoInputDevicesError\n};","'use strict';\n\nvar _require = require('./errors'),\n    NoVideoInputDevicesError = _require.NoVideoInputDevicesError;\n\nfunction defaultDeviceIdChooser(filteredDevices, videoDevices, facingMode) {\n  if (filteredDevices.length > 0) {\n    return filteredDevices[0].deviceId;\n  }\n  if (videoDevices.length == 1 || facingMode == 'user') {\n    return videoDevices[0].deviceId;\n  }\n  return videoDevices[1].deviceId;\n}\n\nvar getFacingModePattern = function getFacingModePattern(facingMode) {\n  return facingMode == 'environment' ? /rear|back|environment/ig : /front|user|face/ig;\n};\n\nfunction getDeviceId(facingMode) {\n  var chooseDeviceId = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : defaultDeviceIdChooser;\n\n  // Get manual deviceId from available devices.\n  return new Promise(function (resolve, reject) {\n    var enumerateDevices = void 0;\n    try {\n      enumerateDevices = navigator.mediaDevices.enumerateDevices();\n    } catch (err) {\n      reject(new NoVideoInputDevicesError());\n    }\n    enumerateDevices.then(function (devices) {\n      // Filter out non-videoinputs\n      var videoDevices = devices.filter(function (device) {\n        return device.kind == 'videoinput';\n      });\n\n      if (videoDevices.length < 1) {\n        reject(new NoVideoInputDevicesError());\n        return;\n      }\n\n      var pattern = getFacingModePattern(facingMode);\n\n      // Filter out video devices without the pattern\n      var filteredDevices = videoDevices.filter(function (_ref) {\n        var label = _ref.label;\n        return pattern.test(label);\n      });\n\n      resolve(chooseDeviceId(filteredDevices, videoDevices, facingMode));\n    });\n  });\n}\n\nmodule.exports = { getDeviceId: getDeviceId, getFacingModePattern: getFacingModePattern };","\"use 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componentWillReceiveProps(nextProps) {\n      // React according to change in props\n      var changedProps = havePropsChanged(this.props, nextProps, propsKeys);\n\n      var _iteratorNormalCompletion = true;\n      var _didIteratorError = false;\n      var _iteratorError = undefined;\n\n      try {\n        for (var _iterator = changedProps[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {\n          var prop = _step.value;\n\n          if (prop == 'facingMode') {\n            this.clearComponent();\n            this.initiate(nextProps);\n            break;\n          } else if (prop == 'delay') {\n            if (this.props.delay == false && !nextProps.legacyMode) {\n              this.timeout = setTimeout(this.check, nextProps.delay);\n            }\n            if (nextProps.delay == false) {\n              clearTimeout(this.timeout);\n            }\n          } else if (prop == 'legacyMode') {\n            if (this.props.legacyMode && !nextProps.legacyMode) {\n              this.clearComponent();\n              this.initiate(nextProps);\n            } else {\n              this.clearComponent();\n              this.componentDidUpdate = this.initiateLegacyMode;\n            }\n            break;\n          }\n        }\n      } catch (err) {\n        _didIteratorError = true;\n        _iteratorError = err;\n      } finally {\n        try {\n          if (!_iteratorNormalCompletion && _iterator.return) {\n            _iterator.return();\n          }\n        } finally {\n          if (_didIteratorError) {\n            throw _iteratorError;\n          }\n        }\n      }\n    }\n  }, {\n    key: 'shouldComponentUpdate',\n    value: function shouldComponentUpdate(nextProps, nextState) {\n      if (nextState !== this.state) {\n        return true;\n      }\n\n      // Only render when the `propsKeys` have changed.\n      var changedProps = havePropsChanged(this.props, nextProps, propsKeys);\n      return changedProps.length > 0;\n    }\n  }, {\n    key: 'componentWillUnmount',\n    value: function componentWillUnmount() {\n      // Stop web-worker and clear the component\n      if (this.worker) {\n        this.worker.terminate();\n        this.worker = undefined;\n      }\n      this.clearComponent();\n    }\n  }, {\n    key: 'clearComponent',\n    value: function clearComponent() {\n      // Remove all event listeners and variables\n      if (this.timeout) {\n        clearTimeout(this.timeout);\n        this.timeout = undefined;\n      }\n      if (this.stopCamera) {\n        this.stopCamera();\n      }\n      if (this.reader) {\n        this.reader.removeEventListener('load', this.handleReaderLoad);\n      }\n      if (this.els.img) {\n        this.els.img.removeEventListener('load', this.check);\n      }\n    }\n  }, {\n    key: 'initiate',\n    value: function initiate() {\n      var props = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.props;\n      var onError = props.onError,\n          facingMode = props.facingMode;\n\n      // Check browser facingMode constraint support\n      // Firefox ignores facingMode or deviceId constraints\n\n      var isFirefox = /firefox/i.test(navigator.userAgent);\n      var supported = {};\n      if (navigator.mediaDevices && typeof navigator.mediaDevices.getSupportedConstraints === 'function') {\n        supported = navigator.mediaDevices.getSupportedConstraints();\n      }\n      var constraints = {};\n\n      if (supported.facingMode) {\n        constraints.facingMode = { ideal: facingMode };\n      }\n      if (supported.frameRate) {\n        constraints.frameRate = { ideal: 25, min: 10 };\n      }\n\n      var vConstraintsPromise = supported.facingMode || isFirefox ? Promise.resolve(props.constraints || constraints) : getDeviceId(facingMode).then(function (deviceId) {\n        return Object.assign({}, { deviceId: deviceId }, props.constraints);\n      });\n\n      vConstraintsPromise.then(function (video) {\n        return navigator.mediaDevices.getUserMedia({ video: video });\n      }).then(this.handleVideo).catch(onError);\n    }\n  }, {\n    key: 'handleVideo',\n    value: function handleVideo(stream) {\n      var preview = this.els.preview;\n      var facingMode = this.props.facingMode;\n\n      // Preview element hasn't been rendered so wait for it.\n\n      if (!preview) {\n        return setTimeout(this.handleVideo, 200, stream);\n      }\n\n      // Handle different browser implementations of MediaStreams as src\n      if ((preview || {}).srcObject !== undefined) {\n        preview.srcObject = stream;\n      } else if (preview.mozSrcObject !== undefined) {\n        preview.mozSrcObject = stream;\n      } else if (window.URL.createObjectURL) {\n        preview.src = window.URL.createObjectURL(stream);\n      } else if (window.webkitURL) {\n        preview.src = window.webkitURL.createObjectURL(stream);\n      } else {\n        preview.src = stream;\n      }\n\n      // IOS play in fullscreen\n      preview.playsInline = true;\n\n      var streamTrack = stream.getTracks()[0];\n      // Assign `stopCamera` so the track can be stopped once component is cleared\n      this.stopCamera = streamTrack.stop.bind(streamTrack);\n\n      preview.addEventListener('loadstart', this.handleLoadStart);\n\n      this.setState({ mirrorVideo: facingMode == 'user', streamLabel: streamTrack.label });\n    }\n  }, {\n    key: 'handleLoadStart',\n    value: function handleLoadStart() {\n      var _props = this.props,\n          delay = _props.delay,\n          onLoad = _props.onLoad;\n      var _state = this.state,\n          mirrorVideo = _state.mirrorVideo,\n          streamLabel = _state.streamLabel;\n\n      var preview = this.els.preview;\n      preview.play();\n\n      if (typeof onLoad == 'function') {\n        onLoad({ mirrorVideo: mirrorVideo, streamLabel: streamLabel });\n      }\n\n      if (typeof delay == 'number') {\n        this.timeout = setTimeout(this.check, delay);\n      }\n\n      // Some browsers call loadstart continuously\n      preview.removeEventListener('loadstart', this.handleLoadStart);\n    }\n  }, {\n    key: 'check',\n    value: function check() {\n      var _props2 = this.props,\n          legacyMode = _props2.legacyMode,\n          resolution = _props2.resolution,\n          delay = _props2.delay;\n      var _els = this.els,\n          preview = _els.preview,\n          canvas = _els.canvas,\n          img = _els.img;\n\n      // Get image/video dimensions\n\n      var width = Math.floor(legacyMode ? img.naturalWidth : preview.videoWidth);\n      var height = Math.floor(legacyMode ? img.naturalHeight : preview.videoHeight);\n\n      // Canvas draw offsets\n      var hozOffset = 0;\n      var vertOffset = 0;\n\n      // Scale image to correct resolution\n      if (legacyMode) {\n        // Keep image aspect ratio\n        var greatestSize = width > height ? width : height;\n        var ratio = resolution / greatestSize;\n\n        height = ratio * height;\n        width = ratio * width;\n\n        canvas.width = width;\n        canvas.height = height;\n      } else {\n        // Crop image to fit 1:1 aspect ratio\n        var smallestSize = width < height ? width : height;\n        var _ratio = resolution / smallestSize;\n\n        height = _ratio * height;\n        width = _ratio * width;\n\n        vertOffset = (height - resolution) / 2 * -1;\n        hozOffset = (width - resolution) / 2 * -1;\n\n        canvas.width = resolution;\n        canvas.height = resolution;\n      }\n\n      var previewIsPlaying = preview && preview.readyState === preview.HAVE_ENOUGH_DATA;\n\n      if (legacyMode || previewIsPlaying) {\n        var ctx = canvas.getContext('2d');\n\n        ctx.drawImage(legacyMode ? img : preview, hozOffset, vertOffset, width, height);\n\n        var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);\n        // Send data to web-worker\n        this.worker.postMessage(imageData);\n      } else {\n        // Preview not ready -> check later\n        this.timeout = setTimeout(this.check, delay);\n      }\n    }\n  }, {\n    key: 'handleWorkerMessage',\n    value: function handleWorkerMessage(e) {\n      var _props3 = this.props,\n          onScan = _props3.onScan,\n          legacyMode = _props3.legacyMode,\n          delay = _props3.delay;\n\n      var decoded = e.data;\n      onScan(decoded || null);\n\n      if (!legacyMode && typeof delay == 'number' && this.worker) {\n        this.timeout = setTimeout(this.check, delay);\n      }\n    }\n  }, {\n    key: 'initiateLegacyMode',\n    value: function initiateLegacyMode() {\n      this.reader = new FileReader();\n      this.reader.addEventListener('load', this.handleReaderLoad);\n      this.els.img.addEventListener('load', this.check, false);\n\n      // Reset componentDidUpdate\n      this.componentDidUpdate = undefined;\n\n      if (typeof this.props.onLoad == 'function') {\n        this.props.onLoad();\n      }\n    }\n  }, {\n    key: 'handleInputChange',\n    value: function handleInputChange(e) {\n      var selectedImg = e.target.files[0];\n      this.reader.readAsDataURL(selectedImg);\n    }\n  }, {\n    key: 'handleReaderLoad',\n    value: function handleReaderLoad(e) {\n      // Set selected image blob as img source\n      this.els.img.src = e.target.result;\n    }\n  }, {\n    key: 'openImageDialog',\n    value: function openImageDialog() {\n      // Function to be executed by parent in user action context to trigger img file uploader\n      this.els.input.click();\n    }\n  }, {\n    key: 'setRefFactory',\n    value: function setRefFactory(key) {\n      var _this2 = this;\n\n      return function (element) {\n        _this2.els[key] = element;\n      };\n    }\n  }, {\n    key: 'render',\n    value: function render() {\n      var _props4 = this.props,\n          style = _props4.style,\n          className = _props4.className,\n          onImageLoad = _props4.onImageLoad,\n          legacyMode = _props4.legacyMode,\n          showViewFinder = _props4.showViewFinder,\n          facingMode = _props4.facingMode;\n\n\n      var containerStyle = {\n        overflow: 'hidden',\n        position: 'relative',\n        width: '100%',\n        paddingTop: '100%'\n      };\n      var hiddenStyle = { display: 'none' };\n      var previewStyle = {\n        top: 0,\n        left: 0,\n        display: 'block',\n        position: 'absolute',\n        overflow: 'hidden',\n        width: '100%',\n        height: '100%'\n      };\n      var videoPreviewStyle = _extends({}, previewStyle, {\n        objectFit: 'cover',\n        transform: this.state.mirrorVideo ? 'scaleX(-1)' : undefined\n      });\n      var imgPreviewStyle = _extends({}, previewStyle, {\n        objectFit: 'scale-down'\n      });\n\n      var viewFinderStyle = {\n        top: 0,\n        left: 0,\n        zIndex: 1,\n        boxSizing: 'border-box',\n        border: '50px solid rgba(0, 0, 0, 0.3)',\n        boxShadow: 'inset 0 0 0 5px rgba(255, 0, 0, 0.5)',\n        position: 'absolute',\n        width: '100%',\n        height: '100%'\n      };\n\n      return React.createElement(\n        'section',\n        { className: className, style: style },\n        React.createElement(\n          'section',\n          { style: containerStyle },\n          !legacyMode && showViewFinder ? React.createElement('div', { style: viewFinderStyle }) : null,\n          legacyMode ? React.createElement('input', {\n            style: hiddenStyle,\n            type: 'file',\n            accept: 'image/*',\n            ref: this.setRefFactory('input'),\n            onChange: this.handleInputChange\n          }) : null,\n          legacyMode ? React.createElement('img', { style: imgPreviewStyle, ref: this.setRefFactory('img'), onLoad: onImageLoad }) : React.createElement('video', { style: videoPreviewStyle, ref: this.setRefFactory('preview') }),\n          React.createElement('canvas', { style: hiddenStyle, ref: this.setRefFactory('canvas') })\n        )\n      );\n    }\n  }]);\n\n  return Reader;\n}(Component), _class.propTypes = {\n  onScan: PropTypes.func.isRequired,\n  onError: PropTypes.func.isRequired,\n  onLoad: PropTypes.func,\n  onImageLoad: PropTypes.func,\n  delay: PropTypes.oneOfType([PropTypes.number, PropTypes.bool]),\n  facingMode: PropTypes.oneOf(['user', 'environment']),\n  legacyMode: PropTypes.bool,\n  resolution: PropTypes.number,\n  showViewFinder: PropTypes.bool,\n  style: PropTypes.any,\n  className: PropTypes.string,\n  constraints: PropTypes.object\n}, _class.defaultProps = {\n  delay: 500,\n  resolution: 600,\n  facingMode: 'environment',\n  showViewFinder: true,\n  constraints: null\n}, _temp);","/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nvar SDPUtils = require('sdp');\n\nfunction fixStatsType(stat) {\n  return {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  }[stat.type] || stat.type;\n}\n\nfunction writeMediaSection(transceiver, caps, type, stream, dtlsRole) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n      transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n      transceiver.dtlsTransport.getLocalParameters(),\n      type === 'offer' ? 'actpass' : dtlsRole || 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    var trackId = transceiver.rtpSender._initialTrackId ||\n        transceiver.rtpSender.track.id;\n    transceiver.rtpSender._initialTrackId = trackId;\n    // spec.\n    var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +\n        trackId + '\\r\\n';\n    sdp += 'a=' + msid;\n    // for Chrome. Legacy should no longer be required.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n\n    // RTX\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n}\n\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nfunction filterIceServers(iceServers, edgeVersion) {\n  var hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(function(server) {\n    if (server && (server.urls || server.url)) {\n      var urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        console.warn('RTCIceServer.url is deprecated! Use urls instead.');\n      }\n      var isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(function(url) {\n        var validTurn = url.indexOf('turn:') === 0 &&\n            url.indexOf('transport=udp') !== -1 &&\n            url.indexOf('turn:[') === -1 &&\n            !hasTurn;\n\n        if (validTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&\n            url.indexOf('?transport=udp') === -1;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n\n// Determines the intersection of local and remote capabilities.\nfunction getCommonCapabilities(localCapabilities, remoteCapabilities) {\n  var commonCapabilities = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: []\n  };\n\n  var findCodecByPayloadType = function(pt, codecs) {\n    pt = parseInt(pt, 10);\n    for (var i = 0; i < codecs.length; i++) {\n      if (codecs[i].payloadType === pt ||\n          codecs[i].preferredPayloadType === pt) {\n        return codecs[i];\n      }\n    }\n  };\n\n  var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {\n    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);\n    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);\n    return lCodec && rCodec &&\n        lCodec.name.toLowerCase() === rCodec.name.toLowerCase();\n  };\n\n  localCapabilities.codecs.forEach(function(lCodec) {\n    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {\n      var rCodec = remoteCapabilities.codecs[i];\n      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&\n          lCodec.clockRate === rCodec.clockRate) {\n        if (lCodec.name.toLowerCase() === 'rtx' &&\n            lCodec.parameters && rCodec.parameters.apt) {\n          // for RTX we need to find the local rtx that has a apt\n          // which points to the same local codec as the remote one.\n          if (!rtxCapabilityMatches(lCodec, rCodec,\n              localCapabilities.codecs, remoteCapabilities.codecs)) {\n            continue;\n          }\n        }\n        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy\n        // number of channels is the highest common number of channels\n        rCodec.numChannels = Math.min(lCodec.numChannels,\n            rCodec.numChannels);\n        // push rCodec so we reply with offerer payload type\n        commonCapabilities.codecs.push(rCodec);\n\n        // determine common feedback mechanisms\n        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {\n          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {\n            if (lCodec.rtcpFeedback[j].type === fb.type &&\n                lCodec.rtcpFeedback[j].parameter === fb.parameter) {\n              return true;\n            }\n          }\n          return false;\n        });\n        // FIXME: also need to determine .parameters\n        //  see https://github.com/openpeer/ortc/issues/569\n        break;\n      }\n    }\n  });\n\n  localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {\n    for (var i = 0; i < remoteCapabilities.headerExtensions.length;\n         i++) {\n      var rHeaderExtension = remoteCapabilities.headerExtensions[i];\n      if (lHeaderExtension.uri === rHeaderExtension.uri) {\n        commonCapabilities.headerExtensions.push(rHeaderExtension);\n        break;\n      }\n    }\n  });\n\n  // FIXME: fecMechanisms\n  return commonCapabilities;\n}\n\n// is action=setLocalDescription with type allowed in signalingState\nfunction isActionAllowedInSignalingState(action, type, signalingState) {\n  return {\n    offer: {\n      setLocalDescription: ['stable', 'have-local-offer'],\n      setRemoteDescription: ['stable', 'have-remote-offer']\n    },\n    answer: {\n      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],\n      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']\n    }\n  }[type][action].indexOf(signalingState) !== -1;\n}\n\nfunction maybeAddCandidate(iceTransport, candidate) {\n  // Edge's internal representation adds some fields therefore\n  // not all fieldѕ are taken into account.\n  var alreadyAdded = iceTransport.getRemoteCandidates()\n      .find(function(remoteCandidate) {\n        return candidate.foundation === remoteCandidate.foundation &&\n            candidate.ip === remoteCandidate.ip &&\n            candidate.port === remoteCandidate.port &&\n            candidate.priority === remoteCandidate.priority &&\n            candidate.protocol === remoteCandidate.protocol &&\n            candidate.type === remoteCandidate.type;\n      });\n  if (!alreadyAdded) {\n    iceTransport.addRemoteCandidate(candidate);\n  }\n  return !alreadyAdded;\n}\n\n\nfunction makeError(name, description) {\n  var e = new Error(description);\n  e.name = name;\n  // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names\n  e.code = {\n    NotSupportedError: 9,\n    InvalidStateError: 11,\n    InvalidAccessError: 15,\n    TypeError: undefined,\n    OperationError: undefined\n  }[name];\n  return e;\n}\n\nmodule.exports = function(window, edgeVersion) {\n  // https://w3c.github.io/mediacapture-main/#mediastream\n  // Helper function to add the track to the stream and\n  // dispatch the event ourselves.\n  function addTrackToStreamAndFireEvent(track, stream) {\n    stream.addTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',\n        {track: track}));\n  }\n\n  function removeTrackFromStreamAndFireEvent(track, stream) {\n    stream.removeTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',\n        {track: track}));\n  }\n\n  function fireAddTrack(pc, track, receiver, streams) {\n    var trackEvent = new Event('track');\n    trackEvent.track = track;\n    trackEvent.receiver = receiver;\n    trackEvent.transceiver = {receiver: receiver};\n    trackEvent.streams = streams;\n    window.setTimeout(function() {\n      pc._dispatchEvent('track', trackEvent);\n    });\n  }\n\n  var RTCPeerConnection = function(config) {\n    var pc = this;\n\n    var _eventTarget = document.createDocumentFragment();\n    ['addEventListener', 'removeEventListener', 'dispatchEvent']\n        .forEach(function(method) {\n          pc[method] = _eventTarget[method].bind(_eventTarget);\n        });\n\n    this.canTrickleIceCandidates = null;\n\n    this.needNegotiation = false;\n\n    this.localStreams = [];\n    this.remoteStreams = [];\n\n    this._localDescription = null;\n    this._remoteDescription = null;\n\n    this.signalingState = 'stable';\n    this.iceConnectionState = 'new';\n    this.connectionState = 'new';\n    this.iceGatheringState = 'new';\n\n    config = JSON.parse(JSON.stringify(config || {}));\n\n    this.usingBundle = config.bundlePolicy === 'max-bundle';\n    if (config.rtcpMuxPolicy === 'negotiate') {\n      throw(makeError('NotSupportedError',\n          'rtcpMuxPolicy \\'negotiate\\' is not supported'));\n    } else if (!config.rtcpMuxPolicy) {\n      config.rtcpMuxPolicy = 'require';\n    }\n\n    switch (config.iceTransportPolicy) {\n      case 'all':\n      case 'relay':\n        break;\n      default:\n        config.iceTransportPolicy = 'all';\n        break;\n    }\n\n    switch (config.bundlePolicy) {\n      case 'balanced':\n      case 'max-compat':\n      case 'max-bundle':\n        break;\n      default:\n        config.bundlePolicy = 'balanced';\n        break;\n    }\n\n    config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);\n\n    this._iceGatherers = [];\n    if (config.iceCandidatePoolSize) {\n      for (var i = config.iceCandidatePoolSize; i > 0; i--) {\n        this._iceGatherers.push(new window.RTCIceGatherer({\n          iceServers: config.iceServers,\n          gatherPolicy: config.iceTransportPolicy\n        }));\n      }\n    } else {\n      config.iceCandidatePoolSize = 0;\n    }\n\n    this._config = config;\n\n    // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...\n    // everything that is needed to describe a SDP m-line.\n    this.transceivers = [];\n\n    this._sdpSessionId = SDPUtils.generateSessionId();\n    this._sdpSessionVersion = 0;\n\n    this._dtlsRole = undefined; // role for a=setup to use in answers.\n\n    this._isClosed = false;\n  };\n\n  Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {\n    configurable: true,\n    get: function() {\n      return this._localDescription;\n    }\n  });\n  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {\n    configurable: true,\n    get: function() {\n      return this._remoteDescription;\n    }\n  });\n\n  // set up event handlers on prototype\n  RTCPeerConnection.prototype.onicecandidate = null;\n  RTCPeerConnection.prototype.onaddstream = null;\n  RTCPeerConnection.prototype.ontrack = null;\n  RTCPeerConnection.prototype.onremovestream = null;\n  RTCPeerConnection.prototype.onsignalingstatechange = null;\n  RTCPeerConnection.prototype.oniceconnectionstatechange = null;\n  RTCPeerConnection.prototype.onconnectionstatechange = null;\n  RTCPeerConnection.prototype.onicegatheringstatechange = null;\n  RTCPeerConnection.prototype.onnegotiationneeded = null;\n  RTCPeerConnection.prototype.ondatachannel = null;\n\n  RTCPeerConnection.prototype._dispatchEvent = function(name, event) {\n    if (this._isClosed) {\n      return;\n    }\n    this.dispatchEvent(event);\n    if (typeof this['on' + name] === 'function') {\n      this['on' + name](event);\n    }\n  };\n\n  RTCPeerConnection.prototype._emitGatheringStateChange = function() {\n    var event = new Event('icegatheringstatechange');\n    this._dispatchEvent('icegatheringstatechange', event);\n  };\n\n  RTCPeerConnection.prototype.getConfiguration = function() {\n    return this._config;\n  };\n\n  RTCPeerConnection.prototype.getLocalStreams = function() {\n    return this.localStreams;\n  };\n\n  RTCPeerConnection.prototype.getRemoteStreams = function() {\n    return this.remoteStreams;\n  };\n\n  // internal helper to create a transceiver object.\n  // (which is not yet the same as the WebRTC 1.0 transceiver)\n  RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {\n    var hasBundleTransport = this.transceivers.length > 0;\n    var transceiver = {\n      track: null,\n      iceGatherer: null,\n      iceTransport: null,\n      dtlsTransport: null,\n      localCapabilities: null,\n      remoteCapabilities: null,\n      rtpSender: null,\n      rtpReceiver: null,\n      kind: kind,\n      mid: null,\n      sendEncodingParameters: null,\n      recvEncodingParameters: null,\n      stream: null,\n      associatedRemoteMediaStreams: [],\n      wantReceive: true\n    };\n    if (this.usingBundle && hasBundleTransport) {\n      transceiver.iceTransport = this.transceivers[0].iceTransport;\n      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;\n    } else {\n      var transports = this._createIceAndDtlsTransports();\n      transceiver.iceTransport = transports.iceTransport;\n      transceiver.dtlsTransport = transports.dtlsTransport;\n    }\n    if (!doNotAdd) {\n      this.transceivers.push(transceiver);\n    }\n    return transceiver;\n  };\n\n  RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call addTrack on a closed peerconnection.');\n    }\n\n    var alreadyExists = this.transceivers.find(function(s) {\n      return s.track === track;\n    });\n\n    if (alreadyExists) {\n      throw makeError('InvalidAccessError', 'Track already exists.');\n    }\n\n    var transceiver;\n    for (var i = 0; i < this.transceivers.length; i++) {\n      if (!this.transceivers[i].track &&\n          this.transceivers[i].kind === track.kind) {\n        transceiver = this.transceivers[i];\n      }\n    }\n    if (!transceiver) {\n      transceiver = this._createTransceiver(track.kind);\n    }\n\n    this._maybeFireNegotiationNeeded();\n\n    if (this.localStreams.indexOf(stream) === -1) {\n      this.localStreams.push(stream);\n    }\n\n    transceiver.track = track;\n    transceiver.stream = stream;\n    transceiver.rtpSender = new window.RTCRtpSender(track,\n        transceiver.dtlsTransport);\n    return transceiver.rtpSender;\n  };\n\n  RTCPeerConnection.prototype.addStream = function(stream) {\n    var pc = this;\n    if (edgeVersion >= 15025) {\n      stream.getTracks().forEach(function(track) {\n        pc.addTrack(track, stream);\n      });\n    } else {\n      // Clone is necessary for local demos mostly, attaching directly\n      // to two different senders does not work (build 10547).\n      // Fixed in 15025 (or earlier)\n      var clonedStream = stream.clone();\n      stream.getTracks().forEach(function(track, idx) {\n        var clonedTrack = clonedStream.getTracks()[idx];\n        track.addEventListener('enabled', function(event) {\n          clonedTrack.enabled = event.enabled;\n        });\n      });\n      clonedStream.getTracks().forEach(function(track) {\n        pc.addTrack(track, clonedStream);\n      });\n    }\n  };\n\n  RTCPeerConnection.prototype.removeTrack = function(sender) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call removeTrack on a closed peerconnection.');\n    }\n\n    if (!(sender instanceof window.RTCRtpSender)) {\n      throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +\n          'does not implement interface RTCRtpSender.');\n    }\n\n    var transceiver = this.transceivers.find(function(t) {\n      return t.rtpSender === sender;\n    });\n\n    if (!transceiver) {\n      throw makeError('InvalidAccessError',\n          'Sender was not created by this connection.');\n    }\n    var stream = transceiver.stream;\n\n    transceiver.rtpSender.stop();\n    transceiver.rtpSender = null;\n    transceiver.track = null;\n    transceiver.stream = null;\n\n    // remove the stream from the set of local streams\n    var localStreams = this.transceivers.map(function(t) {\n      return t.stream;\n    });\n    if (localStreams.indexOf(stream) === -1 &&\n        this.localStreams.indexOf(stream) > -1) {\n      this.localStreams.splice(this.localStreams.indexOf(stream), 1);\n    }\n\n    this._maybeFireNegotiationNeeded();\n  };\n\n  RTCPeerConnection.prototype.removeStream = function(stream) {\n    var pc = this;\n    stream.getTracks().forEach(function(track) {\n      var sender = pc.getSenders().find(function(s) {\n        return s.track === track;\n      });\n      if (sender) {\n        pc.removeTrack(sender);\n      }\n    });\n  };\n\n  RTCPeerConnection.prototype.getSenders = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpSender;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpSender;\n    });\n  };\n\n  RTCPeerConnection.prototype.getReceivers = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpReceiver;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpReceiver;\n    });\n  };\n\n\n  RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,\n      usingBundle) {\n    var pc = this;\n    if (usingBundle && sdpMLineIndex > 0) {\n      return this.transceivers[0].iceGatherer;\n    } else if (this._iceGatherers.length) {\n      return this._iceGatherers.shift();\n    }\n    var iceGatherer = new window.RTCIceGatherer({\n      iceServers: this._config.iceServers,\n      gatherPolicy: this._config.iceTransportPolicy\n    });\n    Object.defineProperty(iceGatherer, 'state',\n        {value: 'new', writable: true}\n    );\n\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];\n    this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {\n      var end = !event.candidate || Object.keys(event.candidate).length === 0;\n      // polyfill since RTCIceGatherer.state is not implemented in\n      // Edge 10547 yet.\n      iceGatherer.state = end ? 'completed' : 'gathering';\n      if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {\n        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);\n      }\n    };\n    iceGatherer.addEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    return iceGatherer;\n  };\n\n  // start gathering from an RTCIceGatherer.\n  RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {\n    var pc = this;\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer.onlocalcandidate) {\n      return;\n    }\n    var bufferedCandidateEvents =\n      this.transceivers[sdpMLineIndex].bufferedCandidateEvents;\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;\n    iceGatherer.removeEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    iceGatherer.onlocalcandidate = function(evt) {\n      if (pc.usingBundle && sdpMLineIndex > 0) {\n        // if we know that we use bundle we can drop candidates with\n        // ѕdpMLineIndex > 0. If we don't do this then our state gets\n        // confused since we dispose the extra ice gatherer.\n        return;\n      }\n      var event = new Event('icecandidate');\n      event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};\n\n      var cand = evt.candidate;\n      // Edge emits an empty object for RTCIceCandidateComplete‥\n      var end = !cand || Object.keys(cand).length === 0;\n      if (end) {\n        // polyfill since RTCIceGatherer.state is not implemented in\n        // Edge 10547 yet.\n        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {\n          iceGatherer.state = 'completed';\n        }\n      } else {\n        if (iceGatherer.state === 'new') {\n          iceGatherer.state = 'gathering';\n        }\n        // RTCIceCandidate doesn't have a component, needs to be added\n        cand.component = 1;\n        // also the usernameFragment. TODO: update SDP to take both variants.\n        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;\n\n        var serializedCandidate = SDPUtils.writeCandidate(cand);\n        event.candidate = Object.assign(event.candidate,\n            SDPUtils.parseCandidate(serializedCandidate));\n\n        event.candidate.candidate = serializedCandidate;\n        event.candidate.toJSON = function() {\n          return {\n            candidate: event.candidate.candidate,\n            sdpMid: event.candidate.sdpMid,\n            sdpMLineIndex: event.candidate.sdpMLineIndex,\n            usernameFragment: event.candidate.usernameFragment\n          };\n        };\n      }\n\n      // update local description.\n      var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);\n      if (!end) {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=' + event.candidate.candidate + '\\r\\n';\n      } else {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=end-of-candidates\\r\\n';\n      }\n      pc._localDescription.sdp =\n          SDPUtils.getDescription(pc._localDescription.sdp) +\n          sections.join('');\n      var complete = pc.transceivers.every(function(transceiver) {\n        return transceiver.iceGatherer &&\n            transceiver.iceGatherer.state === 'completed';\n      });\n\n      if (pc.iceGatheringState !== 'gathering') {\n        pc.iceGatheringState = 'gathering';\n        pc._emitGatheringStateChange();\n      }\n\n      // Emit candidate. Also emit null candidate when all gatherers are\n      // complete.\n      if (!end) {\n        pc._dispatchEvent('icecandidate', event);\n      }\n      if (complete) {\n        pc._dispatchEvent('icecandidate', new Event('icecandidate'));\n        pc.iceGatheringState = 'complete';\n        pc._emitGatheringStateChange();\n      }\n    };\n\n    // emit already gathered candidates.\n    window.setTimeout(function() {\n      bufferedCandidateEvents.forEach(function(e) {\n        iceGatherer.onlocalcandidate(e);\n      });\n    }, 0);\n  };\n\n  // Create ICE transport and DTLS transport.\n  RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {\n    var pc = this;\n    var iceTransport = new window.RTCIceTransport(null);\n    iceTransport.onicestatechange = function() {\n      pc._updateIceConnectionState();\n      pc._updateConnectionState();\n    };\n\n    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);\n    dtlsTransport.ondtlsstatechange = function() {\n      pc._updateConnectionState();\n    };\n    dtlsTransport.onerror = function() {\n      // onerror does not set state to failed by itself.\n      Object.defineProperty(dtlsTransport, 'state',\n          {value: 'failed', writable: true});\n      pc._updateConnectionState();\n    };\n\n    return {\n      iceTransport: iceTransport,\n      dtlsTransport: dtlsTransport\n    };\n  };\n\n  // Destroy ICE gatherer, ICE transport and DTLS transport.\n  // Without triggering the callbacks.\n  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(\n      sdpMLineIndex) {\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer) {\n      delete iceGatherer.onlocalcandidate;\n      delete this.transceivers[sdpMLineIndex].iceGatherer;\n    }\n    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;\n    if (iceTransport) {\n      delete iceTransport.onicestatechange;\n      delete this.transceivers[sdpMLineIndex].iceTransport;\n    }\n    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;\n    if (dtlsTransport) {\n      delete dtlsTransport.ondtlsstatechange;\n      delete dtlsTransport.onerror;\n      delete this.transceivers[sdpMLineIndex].dtlsTransport;\n    }\n  };\n\n  // Start the RTP Sender and Receiver for a transceiver.\n  RTCPeerConnection.prototype._transceive = function(transceiver,\n      send, recv) {\n    var params = getCommonCapabilities(transceiver.localCapabilities,\n        transceiver.remoteCapabilities);\n    if (send && transceiver.rtpSender) {\n      params.encodings = transceiver.sendEncodingParameters;\n      params.rtcp = {\n        cname: SDPUtils.localCName,\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.recvEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpSender.send(params);\n    }\n    if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {\n      // remove RTX field in Edge 14942\n      if (transceiver.kind === 'video'\n          && transceiver.recvEncodingParameters\n          && edgeVersion < 15019) {\n        transceiver.recvEncodingParameters.forEach(function(p) {\n          delete p.rtx;\n        });\n      }\n      if (transceiver.recvEncodingParameters.length) {\n        params.encodings = transceiver.recvEncodingParameters;\n      } else {\n        params.encodings = [{}];\n      }\n      params.rtcp = {\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.rtcpParameters.cname) {\n        params.rtcp.cname = transceiver.rtcpParameters.cname;\n      }\n      if (transceiver.sendEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpReceiver.receive(params);\n    }\n  };\n\n  RTCPeerConnection.prototype.setLocalDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setLocalDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set local ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var sections;\n    var sessionpart;\n    if (description.type === 'offer') {\n      // VERY limited support for SDP munging. Limited to:\n      // * changing the order of codecs\n      sections = SDPUtils.splitSections(description.sdp);\n      sessionpart = sections.shift();\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var caps = SDPUtils.parseRtpParameters(mediaSection);\n        pc.transceivers[sdpMLineIndex].localCapabilities = caps;\n      });\n\n      pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n        pc._gather(transceiver.mid, sdpMLineIndex);\n      });\n    } else if (description.type === 'answer') {\n      sections = SDPUtils.splitSections(pc._remoteDescription.sdp);\n      sessionpart = sections.shift();\n      var isIceLite = SDPUtils.matchPrefix(sessionpart,\n          'a=ice-lite').length > 0;\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        var iceGatherer = transceiver.iceGatherer;\n        var iceTransport = transceiver.iceTransport;\n        var dtlsTransport = transceiver.dtlsTransport;\n        var localCapabilities = transceiver.localCapabilities;\n        var remoteCapabilities = transceiver.remoteCapabilities;\n\n        // treat bundle-only as not-rejected.\n        var rejected = SDPUtils.isRejected(mediaSection) &&\n            SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n\n        if (!rejected && !transceiver.rejected) {\n          var remoteIceParameters = SDPUtils.getIceParameters(\n              mediaSection, sessionpart);\n          var remoteDtlsParameters = SDPUtils.getDtlsParameters(\n              mediaSection, sessionpart);\n          if (isIceLite) {\n            remoteDtlsParameters.role = 'server';\n          }\n\n          if (!pc.usingBundle || sdpMLineIndex === 0) {\n            pc._gather(transceiver.mid, sdpMLineIndex);\n            if (iceTransport.state === 'new') {\n              iceTransport.start(iceGatherer, remoteIceParameters,\n                  isIceLite ? 'controlling' : 'controlled');\n            }\n            if (dtlsTransport.state === 'new') {\n              dtlsTransport.start(remoteDtlsParameters);\n            }\n          }\n\n          // Calculate intersection of capabilities.\n          var params = getCommonCapabilities(localCapabilities,\n              remoteCapabilities);\n\n          // Start the RTCRtpSender. The RTCRtpReceiver for this\n          // transceiver has already been started in setRemoteDescription.\n          pc._transceive(transceiver,\n              params.codecs.length > 0,\n              false);\n        }\n      });\n    }\n\n    pc._localDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-local-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.setRemoteDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setRemoteDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set remote ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var streams = {};\n    pc.remoteStreams.forEach(function(stream) {\n      streams[stream.id] = stream;\n    });\n    var receiverList = [];\n    var sections = SDPUtils.splitSections(description.sdp);\n    var sessionpart = sections.shift();\n    var isIceLite = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-lite').length > 0;\n    var usingBundle = SDPUtils.matchPrefix(sessionpart,\n        'a=group:BUNDLE ').length > 0;\n    pc.usingBundle = usingBundle;\n    var iceOptions = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-options:')[0];\n    if (iceOptions) {\n      pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')\n          .indexOf('trickle') >= 0;\n    } else {\n      pc.canTrickleIceCandidates = false;\n    }\n\n    sections.forEach(function(mediaSection, sdpMLineIndex) {\n      var lines = SDPUtils.splitLines(mediaSection);\n      var kind = SDPUtils.getKind(mediaSection);\n      // treat bundle-only as not-rejected.\n      var rejected = SDPUtils.isRejected(mediaSection) &&\n          SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n      var protocol = lines[0].substr(2).split(' ')[2];\n\n      var direction = SDPUtils.getDirection(mediaSection, sessionpart);\n      var remoteMsid = SDPUtils.parseMsid(mediaSection);\n\n      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();\n\n      // Reject datachannels which are not implemented yet.\n      if (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||\n          protocol === 'UDP/DTLS/SCTP'))) {\n        // TODO: this is dangerous in the case where a non-rejected m-line\n        //     becomes rejected.\n        pc.transceivers[sdpMLineIndex] = {\n          mid: mid,\n          kind: kind,\n          protocol: protocol,\n          rejected: true\n        };\n        return;\n      }\n\n      if (!rejected && pc.transceivers[sdpMLineIndex] &&\n          pc.transceivers[sdpMLineIndex].rejected) {\n        // recycle a rejected transceiver.\n        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);\n      }\n\n      var transceiver;\n      var iceGatherer;\n      var iceTransport;\n      var dtlsTransport;\n      var rtpReceiver;\n      var sendEncodingParameters;\n      var recvEncodingParameters;\n      var localCapabilities;\n\n      var track;\n      // FIXME: ensure the mediaSection has rtcp-mux set.\n      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);\n      var remoteIceParameters;\n      var remoteDtlsParameters;\n      if (!rejected) {\n        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters.role = 'client';\n      }\n      recvEncodingParameters =\n          SDPUtils.parseRtpEncodingParameters(mediaSection);\n\n      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);\n\n      var isComplete = SDPUtils.matchPrefix(mediaSection,\n          'a=end-of-candidates', sessionpart).length > 0;\n      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')\n          .map(function(cand) {\n            return SDPUtils.parseCandidate(cand);\n          })\n          .filter(function(cand) {\n            return cand.component === 1;\n          });\n\n      // Check if we can use BUNDLE and dispose transports.\n      if ((description.type === 'offer' || description.type === 'answer') &&\n          !rejected && usingBundle && sdpMLineIndex > 0 &&\n          pc.transceivers[sdpMLineIndex]) {\n        pc._disposeIceAndDtlsTransports(sdpMLineIndex);\n        pc.transceivers[sdpMLineIndex].iceGatherer =\n            pc.transceivers[0].iceGatherer;\n        pc.transceivers[sdpMLineIndex].iceTransport =\n            pc.transceivers[0].iceTransport;\n        pc.transceivers[sdpMLineIndex].dtlsTransport =\n            pc.transceivers[0].dtlsTransport;\n        if (pc.transceivers[sdpMLineIndex].rtpSender) {\n          pc.transceivers[sdpMLineIndex].rtpSender.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {\n          pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n      }\n      if (description.type === 'offer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex] ||\n            pc._createTransceiver(kind);\n        transceiver.mid = mid;\n\n        if (!transceiver.iceGatherer) {\n          transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n              usingBundle);\n        }\n\n        if (cands.length && transceiver.iceTransport.state === 'new') {\n          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {\n            transceiver.iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);\n\n        // filter RTX until additional stuff needed for RTX is implemented\n        // in adapter.js\n        if (edgeVersion < 15019) {\n          localCapabilities.codecs = localCapabilities.codecs.filter(\n              function(codec) {\n                return codec.name !== 'rtx';\n              });\n        }\n\n        sendEncodingParameters = transceiver.sendEncodingParameters || [{\n          ssrc: (2 * sdpMLineIndex + 2) * 1001\n        }];\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        var isNewTrack = false;\n        if (direction === 'sendrecv' || direction === 'sendonly') {\n          isNewTrack = !transceiver.rtpReceiver;\n          rtpReceiver = transceiver.rtpReceiver ||\n              new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);\n\n          if (isNewTrack) {\n            var stream;\n            track = rtpReceiver.track;\n            // FIXME: does not work with Plan B.\n            if (remoteMsid && remoteMsid.stream === '-') {\n              // no-op. a stream id of '-' means: no associated stream.\n            } else if (remoteMsid) {\n              if (!streams[remoteMsid.stream]) {\n                streams[remoteMsid.stream] = new window.MediaStream();\n                Object.defineProperty(streams[remoteMsid.stream], 'id', {\n                  get: function() {\n                    return remoteMsid.stream;\n                  }\n                });\n              }\n              Object.defineProperty(track, 'id', {\n                get: function() {\n                  return remoteMsid.track;\n                }\n              });\n              stream = streams[remoteMsid.stream];\n            } else {\n              if (!streams.default) {\n                streams.default = new window.MediaStream();\n              }\n              stream = streams.default;\n            }\n            if (stream) {\n              addTrackToStreamAndFireEvent(track, stream);\n              transceiver.associatedRemoteMediaStreams.push(stream);\n            }\n            receiverList.push([track, rtpReceiver, stream]);\n          }\n        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {\n          transceiver.associatedRemoteMediaStreams.forEach(function(s) {\n            var nativeTrack = s.getTracks().find(function(t) {\n              return t.id === transceiver.rtpReceiver.track.id;\n            });\n            if (nativeTrack) {\n              removeTrackFromStreamAndFireEvent(nativeTrack, s);\n            }\n          });\n          transceiver.associatedRemoteMediaStreams = [];\n        }\n\n        transceiver.localCapabilities = localCapabilities;\n        transceiver.remoteCapabilities = remoteCapabilities;\n        transceiver.rtpReceiver = rtpReceiver;\n        transceiver.rtcpParameters = rtcpParameters;\n        transceiver.sendEncodingParameters = sendEncodingParameters;\n        transceiver.recvEncodingParameters = recvEncodingParameters;\n\n        // Start the RTCRtpReceiver now. The RTPSender is started in\n        // setLocalDescription.\n        pc._transceive(pc.transceivers[sdpMLineIndex],\n            false,\n            isNewTrack);\n      } else if (description.type === 'answer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex];\n        iceGatherer = transceiver.iceGatherer;\n        iceTransport = transceiver.iceTransport;\n        dtlsTransport = transceiver.dtlsTransport;\n        rtpReceiver = transceiver.rtpReceiver;\n        sendEncodingParameters = transceiver.sendEncodingParameters;\n        localCapabilities = transceiver.localCapabilities;\n\n        pc.transceivers[sdpMLineIndex].recvEncodingParameters =\n            recvEncodingParameters;\n        pc.transceivers[sdpMLineIndex].remoteCapabilities =\n            remoteCapabilities;\n        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;\n\n        if (cands.length && iceTransport.state === 'new') {\n          if ((isIceLite || isComplete) &&\n              (!usingBundle || sdpMLineIndex === 0)) {\n            iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        if (!usingBundle || sdpMLineIndex === 0) {\n          if (iceTransport.state === 'new') {\n            iceTransport.start(iceGatherer, remoteIceParameters,\n                'controlling');\n          }\n          if (dtlsTransport.state === 'new') {\n            dtlsTransport.start(remoteDtlsParameters);\n          }\n        }\n\n        // If the offer contained RTX but the answer did not,\n        // remove RTX from sendEncodingParameters.\n        var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n        var hasRtx = commonCapabilities.codecs.filter(function(c) {\n          return c.name.toLowerCase() === 'rtx';\n        }).length;\n        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n          delete transceiver.sendEncodingParameters[0].rtx;\n        }\n\n        pc._transceive(transceiver,\n            direction === 'sendrecv' || direction === 'recvonly',\n            direction === 'sendrecv' || direction === 'sendonly');\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        if (rtpReceiver &&\n            (direction === 'sendrecv' || direction === 'sendonly')) {\n          track = rtpReceiver.track;\n          if (remoteMsid) {\n            if (!streams[remoteMsid.stream]) {\n              streams[remoteMsid.stream] = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);\n            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);\n          } else {\n            if (!streams.default) {\n              streams.default = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams.default);\n            receiverList.push([track, rtpReceiver, streams.default]);\n          }\n        } else {\n          // FIXME: actually the receiver should be created later.\n          delete transceiver.rtpReceiver;\n        }\n      }\n    });\n\n    if (pc._dtlsRole === undefined) {\n      pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';\n    }\n\n    pc._remoteDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-remote-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n    Object.keys(streams).forEach(function(sid) {\n      var stream = streams[sid];\n      if (stream.getTracks().length) {\n        if (pc.remoteStreams.indexOf(stream) === -1) {\n          pc.remoteStreams.push(stream);\n          var event = new Event('addstream');\n          event.stream = stream;\n          window.setTimeout(function() {\n            pc._dispatchEvent('addstream', event);\n          });\n        }\n\n        receiverList.forEach(function(item) {\n          var track = item[0];\n          var receiver = item[1];\n          if (stream.id !== item[2].id) {\n            return;\n          }\n          fireAddTrack(pc, track, receiver, [stream]);\n        });\n      }\n    });\n    receiverList.forEach(function(item) {\n      if (item[2]) {\n        return;\n      }\n      fireAddTrack(pc, item[0], item[1], []);\n    });\n\n    // check whether addIceCandidate({}) was called within four seconds after\n    // setRemoteDescription.\n    window.setTimeout(function() {\n      if (!(pc && pc.transceivers)) {\n        return;\n      }\n      pc.transceivers.forEach(function(transceiver) {\n        if (transceiver.iceTransport &&\n            transceiver.iceTransport.state === 'new' &&\n            transceiver.iceTransport.getRemoteCandidates().length > 0) {\n          console.warn('Timeout for addRemoteCandidate. Consider sending ' +\n              'an end-of-candidates notification');\n          transceiver.iceTransport.addRemoteCandidate({});\n        }\n      });\n    }, 4000);\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.close = function() {\n    this.transceivers.forEach(function(transceiver) {\n      /* not yet\n      if (transceiver.iceGatherer) {\n        transceiver.iceGatherer.close();\n      }\n      */\n      if (transceiver.iceTransport) {\n        transceiver.iceTransport.stop();\n      }\n      if (transceiver.dtlsTransport) {\n        transceiver.dtlsTransport.stop();\n      }\n      if (transceiver.rtpSender) {\n        transceiver.rtpSender.stop();\n      }\n      if (transceiver.rtpReceiver) {\n        transceiver.rtpReceiver.stop();\n      }\n    });\n    // FIXME: clean up tracks, local streams, remote streams, etc\n    this._isClosed = true;\n    this._updateSignalingState('closed');\n  };\n\n  // Update the signaling state.\n  RTCPeerConnection.prototype._updateSignalingState = function(newState) {\n    this.signalingState = newState;\n    var event = new Event('signalingstatechange');\n    this._dispatchEvent('signalingstatechange', event);\n  };\n\n  // Determine whether to fire the negotiationneeded event.\n  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {\n    var pc = this;\n    if (this.signalingState !== 'stable' || this.needNegotiation === true) {\n      return;\n    }\n    this.needNegotiation = true;\n    window.setTimeout(function() {\n      if (pc.needNegotiation) {\n        pc.needNegotiation = false;\n        var event = new Event('negotiationneeded');\n        pc._dispatchEvent('negotiationneeded', event);\n      }\n    }, 0);\n  };\n\n  // Update the ice connection state.\n  RTCPeerConnection.prototype._updateIceConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      checking: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n      }\n    });\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.checking > 0) {\n      newState = 'checking';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    } else if (states.completed > 0) {\n      newState = 'completed';\n    }\n\n    if (newState !== this.iceConnectionState) {\n      this.iceConnectionState = newState;\n      var event = new Event('iceconnectionstatechange');\n      this._dispatchEvent('iceconnectionstatechange', event);\n    }\n  };\n\n  // Update the connection state.\n  RTCPeerConnection.prototype._updateConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      connecting: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && transceiver.dtlsTransport &&\n          !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n        states[transceiver.dtlsTransport.state]++;\n      }\n    });\n    // ICETransport.completed and connected are the same for this purpose.\n    states.connected += states.completed;\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.connecting > 0) {\n      newState = 'connecting';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    }\n\n    if (newState !== this.connectionState) {\n      this.connectionState = newState;\n      var event = new Event('connectionstatechange');\n      this._dispatchEvent('connectionstatechange', event);\n    }\n  };\n\n  RTCPeerConnection.prototype.createOffer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createOffer after close'));\n    }\n\n    var numAudioTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'audio';\n    }).length;\n    var numVideoTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'video';\n    }).length;\n\n    // Determine number of audio and video tracks we need to send/recv.\n    var offerOptions = arguments[0];\n    if (offerOptions) {\n      // Reject Chrome legacy constraints.\n      if (offerOptions.mandatory || offerOptions.optional) {\n        throw new TypeError(\n            'Legacy mandatory/optional constraints not supported.');\n      }\n      if (offerOptions.offerToReceiveAudio !== undefined) {\n        if (offerOptions.offerToReceiveAudio === true) {\n          numAudioTracks = 1;\n        } else if (offerOptions.offerToReceiveAudio === false) {\n          numAudioTracks = 0;\n        } else {\n          numAudioTracks = offerOptions.offerToReceiveAudio;\n        }\n      }\n      if (offerOptions.offerToReceiveVideo !== undefined) {\n        if (offerOptions.offerToReceiveVideo === true) {\n          numVideoTracks = 1;\n        } else if (offerOptions.offerToReceiveVideo === false) {\n          numVideoTracks = 0;\n        } else {\n          numVideoTracks = offerOptions.offerToReceiveVideo;\n        }\n      }\n    }\n\n    pc.transceivers.forEach(function(transceiver) {\n      if (transceiver.kind === 'audio') {\n        numAudioTracks--;\n        if (numAudioTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      } else if (transceiver.kind === 'video') {\n        numVideoTracks--;\n        if (numVideoTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      }\n    });\n\n    // Create M-lines for recvonly streams.\n    while (numAudioTracks > 0 || numVideoTracks > 0) {\n      if (numAudioTracks > 0) {\n        pc._createTransceiver('audio');\n        numAudioTracks--;\n      }\n      if (numVideoTracks > 0) {\n        pc._createTransceiver('video');\n        numVideoTracks--;\n      }\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      // For each track, create an ice gatherer, ice transport,\n      // dtls transport, potentially rtpsender and rtpreceiver.\n      var track = transceiver.track;\n      var kind = transceiver.kind;\n      var mid = transceiver.mid || SDPUtils.generateIdentifier();\n      transceiver.mid = mid;\n\n      if (!transceiver.iceGatherer) {\n        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n            pc.usingBundle);\n      }\n\n      var localCapabilities = window.RTCRtpSender.getCapabilities(kind);\n      // filter RTX until additional stuff needed for RTX is implemented\n      // in adapter.js\n      if (edgeVersion < 15019) {\n        localCapabilities.codecs = localCapabilities.codecs.filter(\n            function(codec) {\n              return codec.name !== 'rtx';\n            });\n      }\n      localCapabilities.codecs.forEach(function(codec) {\n        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552\n        // by adding level-asymmetry-allowed=1\n        if (codec.name === 'H264' &&\n            codec.parameters['level-asymmetry-allowed'] === undefined) {\n          codec.parameters['level-asymmetry-allowed'] = '1';\n        }\n\n        // for subsequent offers, we might have to re-use the payload\n        // type of the last offer.\n        if (transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.codecs) {\n          transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {\n            if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&\n                codec.clockRate === remoteCodec.clockRate) {\n              codec.preferredPayloadType = remoteCodec.payloadType;\n            }\n          });\n        }\n      });\n      localCapabilities.headerExtensions.forEach(function(hdrExt) {\n        var remoteExtensions = transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.headerExtensions || [];\n        remoteExtensions.forEach(function(rHdrExt) {\n          if (hdrExt.uri === rHdrExt.uri) {\n            hdrExt.id = rHdrExt.id;\n          }\n        });\n      });\n\n      // generate an ssrc now, to be used later in rtpSender.send\n      var sendEncodingParameters = transceiver.sendEncodingParameters || [{\n        ssrc: (2 * sdpMLineIndex + 1) * 1001\n      }];\n      if (track) {\n        // add RTX\n        if (edgeVersion >= 15019 && kind === 'video' &&\n            !sendEncodingParameters[0].rtx) {\n          sendEncodingParameters[0].rtx = {\n            ssrc: sendEncodingParameters[0].ssrc + 1\n          };\n        }\n      }\n\n      if (transceiver.wantReceive) {\n        transceiver.rtpReceiver = new window.RTCRtpReceiver(\n            transceiver.dtlsTransport, kind);\n      }\n\n      transceiver.localCapabilities = localCapabilities;\n      transceiver.sendEncodingParameters = sendEncodingParameters;\n    });\n\n    // always offer BUNDLE and dispose on return if not supported.\n    if (pc._config.bundlePolicy !== 'max-compat') {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      sdp += writeMediaSection(transceiver, transceiver.localCapabilities,\n          'offer', transceiver.stream, pc._dtlsRole);\n      sdp += 'a=rtcp-rsize\\r\\n';\n\n      if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&\n          (sdpMLineIndex === 0 || !pc.usingBundle)) {\n        transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {\n          cand.component = 1;\n          sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\\r\\n';\n        });\n\n        if (transceiver.iceGatherer.state === 'completed') {\n          sdp += 'a=end-of-candidates\\r\\n';\n        }\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'offer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.createAnswer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer after close'));\n    }\n\n    if (!(pc.signalingState === 'have-remote-offer' ||\n        pc.signalingState === 'have-local-pranswer')) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer in signalingState ' + pc.signalingState));\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    if (pc.usingBundle) {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    var mediaSectionsInOffer = SDPUtils.getMediaSections(\n        pc._remoteDescription.sdp).length;\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      if (sdpMLineIndex + 1 > mediaSectionsInOffer) {\n        return;\n      }\n      if (transceiver.rejected) {\n        if (transceiver.kind === 'application') {\n          if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt\n            sdp += 'm=application 0 DTLS/SCTP 5000\\r\\n';\n          } else {\n            sdp += 'm=application 0 ' + transceiver.protocol +\n                ' webrtc-datachannel\\r\\n';\n          }\n        } else if (transceiver.kind === 'audio') {\n          sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\\r\\n' +\n              'a=rtpmap:0 PCMU/8000\\r\\n';\n        } else if (transceiver.kind === 'video') {\n          sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\\r\\n' +\n              'a=rtpmap:120 VP8/90000\\r\\n';\n        }\n        sdp += 'c=IN IP4 0.0.0.0\\r\\n' +\n            'a=inactive\\r\\n' +\n            'a=mid:' + transceiver.mid + '\\r\\n';\n        return;\n      }\n\n      // FIXME: look at direction.\n      if (transceiver.stream) {\n        var localTrack;\n        if (transceiver.kind === 'audio') {\n          localTrack = transceiver.stream.getAudioTracks()[0];\n        } else if (transceiver.kind === 'video') {\n          localTrack = transceiver.stream.getVideoTracks()[0];\n        }\n        if (localTrack) {\n          // add RTX\n          if (edgeVersion >= 15019 && transceiver.kind === 'video' &&\n              !transceiver.sendEncodingParameters[0].rtx) {\n            transceiver.sendEncodingParameters[0].rtx = {\n              ssrc: transceiver.sendEncodingParameters[0].ssrc + 1\n            };\n          }\n        }\n      }\n\n      // Calculate intersection of capabilities.\n      var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n      var hasRtx = commonCapabilities.codecs.filter(function(c) {\n        return c.name.toLowerCase() === 'rtx';\n      }).length;\n      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n        delete transceiver.sendEncodingParameters[0].rtx;\n      }\n\n      sdp += writeMediaSection(transceiver, commonCapabilities,\n          'answer', transceiver.stream, pc._dtlsRole);\n      if (transceiver.rtcpParameters &&\n          transceiver.rtcpParameters.reducedSize) {\n        sdp += 'a=rtcp-rsize\\r\\n';\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'answer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.addIceCandidate = function(candidate) {\n    var pc = this;\n    var sections;\n    if (candidate && !(candidate.sdpMLineIndex !== undefined ||\n        candidate.sdpMid)) {\n      return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));\n    }\n\n    // TODO: needs to go into ops queue.\n    return new Promise(function(resolve, reject) {\n      if (!pc._remoteDescription) {\n        return reject(makeError('InvalidStateError',\n            'Can not add ICE candidate without a remote description'));\n      } else if (!candidate || candidate.candidate === '') {\n        for (var j = 0; j < pc.transceivers.length; j++) {\n          if (pc.transceivers[j].rejected) {\n            continue;\n          }\n          pc.transceivers[j].iceTransport.addRemoteCandidate({});\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[j] += 'a=end-of-candidates\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n          if (pc.usingBundle) {\n            break;\n          }\n        }\n      } else {\n        var sdpMLineIndex = candidate.sdpMLineIndex;\n        if (candidate.sdpMid) {\n          for (var i = 0; i < pc.transceivers.length; i++) {\n            if (pc.transceivers[i].mid === candidate.sdpMid) {\n              sdpMLineIndex = i;\n              break;\n            }\n          }\n        }\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        if (transceiver) {\n          if (transceiver.rejected) {\n            return resolve();\n          }\n          var cand = Object.keys(candidate.candidate).length > 0 ?\n              SDPUtils.parseCandidate(candidate.candidate) : {};\n          // Ignore Chrome's invalid candidates since Edge does not like them.\n          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {\n            return resolve();\n          }\n          // Ignore RTCP candidates, we assume RTCP-MUX.\n          if (cand.component && cand.component !== 1) {\n            return resolve();\n          }\n          // when using bundle, avoid adding candidates to the wrong\n          // ice transport. And avoid adding candidates added in the SDP.\n          if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&\n              transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {\n            if (!maybeAddCandidate(transceiver.iceTransport, cand)) {\n              return reject(makeError('OperationError',\n                  'Can not add ICE candidate'));\n            }\n          }\n\n          // update the remoteDescription.\n          var candidateString = candidate.candidate.trim();\n          if (candidateString.indexOf('a=') === 0) {\n            candidateString = candidateString.substr(2);\n          }\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[sdpMLineIndex] += 'a=' +\n              (cand.type ? candidateString : 'end-of-candidates')\n              + '\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n        } else {\n          return reject(makeError('OperationError',\n              'Can not add ICE candidate'));\n        }\n      }\n      resolve();\n    });\n  };\n\n  RTCPeerConnection.prototype.getStats = function(selector) {\n    if (selector && selector instanceof window.MediaStreamTrack) {\n      var senderOrReceiver = null;\n      this.transceivers.forEach(function(transceiver) {\n        if (transceiver.rtpSender &&\n            transceiver.rtpSender.track === selector) {\n          senderOrReceiver = transceiver.rtpSender;\n        } else if (transceiver.rtpReceiver &&\n            transceiver.rtpReceiver.track === selector) {\n          senderOrReceiver = transceiver.rtpReceiver;\n        }\n      });\n      if (!senderOrReceiver) {\n        throw makeError('InvalidAccessError', 'Invalid selector.');\n      }\n      return senderOrReceiver.getStats();\n    }\n\n    var promises = [];\n    this.transceivers.forEach(function(transceiver) {\n      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',\n          'dtlsTransport'].forEach(function(method) {\n            if (transceiver[method]) {\n              promises.push(transceiver[method].getStats());\n            }\n          });\n    });\n    return Promise.all(promises).then(function(allStats) {\n      var results = new Map();\n      allStats.forEach(function(stats) {\n        stats.forEach(function(stat) {\n          results.set(stat.id, stat);\n        });\n      });\n      return results;\n    });\n  };\n\n  // fix low-level stat names and return Map instead of object.\n  var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',\n    'RTCIceTransport', 'RTCDtlsTransport'];\n  ortcObjects.forEach(function(ortcObjectName) {\n    var obj = window[ortcObjectName];\n    if (obj && obj.prototype && obj.prototype.getStats) {\n      var nativeGetstats = obj.prototype.getStats;\n      obj.prototype.getStats = function() {\n        return nativeGetstats.apply(this)\n        .then(function(nativeStats) {\n          var mapStats = new Map();\n          Object.keys(nativeStats).forEach(function(id) {\n            nativeStats[id].type = fixStatsType(nativeStats[id]);\n            mapStats.set(id, nativeStats[id]);\n          });\n          return mapStats;\n        });\n      };\n    }\n  });\n\n  // legacy callback shims. Should be moved to adapter.js some days.\n  var methods = ['createOffer', 'createAnswer'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[0] === 'function' ||\n          typeof args[1] === 'function') { // legacy\n        return nativeMethod.apply(this, [arguments[2]])\n        .then(function(description) {\n          if (typeof args[0] === 'function') {\n            args[0].apply(null, [description]);\n          }\n        }, function(error) {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function' ||\n          typeof args[2] === 'function') { // legacy\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        }, function(error) {\n          if (typeof args[2] === 'function') {\n            args[2].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  // getStats is special. It doesn't have a spec legacy method yet we support\n  // getStats(something, cb) without error callbacks.\n  ['getStats'].forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function') {\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  return RTCPeerConnection;\n};\n","/* eslint-env node */\n'use strict';\n\n// SDP helpers.\nvar SDPUtils = {};\n\n// Generate an alphanumeric identifier for cname or mids.\n// TODO: use UUIDs instead? https://gist.github.com/jed/982883\nSDPUtils.generateIdentifier = function() {\n  return Math.random().toString(36).substr(2, 10);\n};\n\n// The RTCP CNAME used by all peerconnections from the same JS.\nSDPUtils.localCName = SDPUtils.generateIdentifier();\n\n// Splits SDP into lines, dealing with both CRLF and LF.\nSDPUtils.splitLines = function(blob) {\n  return blob.trim().split('\\n').map(function(line) {\n    return line.trim();\n  });\n};\n// Splits SDP into sessionpart and mediasections. Ensures CRLF.\nSDPUtils.splitSections = function(blob) {\n  var parts = blob.split('\\nm=');\n  return parts.map(function(part, index) {\n    return (index > 0 ? 'm=' + part : part).trim() + '\\r\\n';\n  });\n};\n\n// returns the session description.\nSDPUtils.getDescription = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  return sections && sections[0];\n};\n\n// returns the individual media sections.\nSDPUtils.getMediaSections = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  sections.shift();\n  return sections;\n};\n\n// Returns lines that start with a certain prefix.\nSDPUtils.matchPrefix = function(blob, prefix) {\n  return SDPUtils.splitLines(blob).filter(function(line) {\n    return line.indexOf(prefix) === 0;\n  });\n};\n\n// Parses an ICE candidate line. Sample input:\n// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8\n// rport 55996\"\nSDPUtils.parseCandidate = function(line) {\n  var parts;\n  // Parse both variants.\n  if (line.indexOf('a=candidate:') === 0) {\n    parts = line.substring(12).split(' ');\n  } else {\n    parts = line.substring(10).split(' ');\n  }\n\n  var candidate = {\n    foundation: parts[0],\n    component: parseInt(parts[1], 10),\n    protocol: parts[2].toLowerCase(),\n    priority: parseInt(parts[3], 10),\n    ip: parts[4],\n    address: parts[4], // address is an alias for ip.\n    port: parseInt(parts[5], 10),\n    // skip parts[6] == 'typ'\n    type: parts[7]\n  };\n\n  for (var i = 8; i < parts.length; i += 2) {\n    switch (parts[i]) {\n      case 'raddr':\n        candidate.relatedAddress = parts[i + 1];\n        break;\n      case 'rport':\n        candidate.relatedPort = parseInt(parts[i + 1], 10);\n        break;\n      case 'tcptype':\n        candidate.tcpType = parts[i + 1];\n        break;\n      case 'ufrag':\n        candidate.ufrag = parts[i + 1]; // for backward compability.\n        candidate.usernameFragment = parts[i + 1];\n        break;\n      default: // extension handling, in particular ufrag\n        candidate[parts[i]] = parts[i + 1];\n        break;\n    }\n  }\n  return candidate;\n};\n\n// Translates a candidate object into SDP candidate attribute.\nSDPUtils.writeCandidate = function(candidate) {\n  var sdp = [];\n  sdp.push(candidate.foundation);\n  sdp.push(candidate.component);\n  sdp.push(candidate.protocol.toUpperCase());\n  sdp.push(candidate.priority);\n  sdp.push(candidate.address || candidate.ip);\n  sdp.push(candidate.port);\n\n  var type = candidate.type;\n  sdp.push('typ');\n  sdp.push(type);\n  if (type !== 'host' && candidate.relatedAddress &&\n      candidate.relatedPort) {\n    sdp.push('raddr');\n    sdp.push(candidate.relatedAddress);\n    sdp.push('rport');\n    sdp.push(candidate.relatedPort);\n  }\n  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {\n    sdp.push('tcptype');\n    sdp.push(candidate.tcpType);\n  }\n  if (candidate.usernameFragment || candidate.ufrag) {\n    sdp.push('ufrag');\n    sdp.push(candidate.usernameFragment || candidate.ufrag);\n  }\n  return 'candidate:' + sdp.join(' ');\n};\n\n// Parses an ice-options line, returns an array of option tags.\n// a=ice-options:foo bar\nSDPUtils.parseIceOptions = function(line) {\n  return line.substr(14).split(' ');\n};\n\n// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:\n// a=rtpmap:111 opus/48000/2\nSDPUtils.parseRtpMap = function(line) {\n  var parts = line.substr(9).split(' ');\n  var parsed = {\n    payloadType: parseInt(parts.shift(), 10) // was: id\n  };\n\n  parts = parts[0].split('/');\n\n  parsed.name = parts[0];\n  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate\n  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;\n  // legacy alias, got renamed back to channels in ORTC.\n  parsed.numChannels = parsed.channels;\n  return parsed;\n};\n\n// Generate an a=rtpmap line from RTCRtpCodecCapability or\n// RTCRtpCodecParameters.\nSDPUtils.writeRtpMap = function(codec) {\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  var channels = codec.channels || codec.numChannels || 1;\n  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +\n      (channels !== 1 ? '/' + channels : '') + '\\r\\n';\n};\n\n// Parses an a=extmap line (headerextension from RFC 5285). Sample input:\n// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\n// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset\nSDPUtils.parseExtmap = function(line) {\n  var parts = line.substr(9).split(' ');\n  return {\n    id: parseInt(parts[0], 10),\n    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',\n    uri: parts[1]\n  };\n};\n\n// Generates a=extmap line from RTCRtpHeaderExtensionParameters or\n// RTCRtpHeaderExtension.\nSDPUtils.writeExtmap = function(headerExtension) {\n  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +\n      (headerExtension.direction && headerExtension.direction !== 'sendrecv'\n        ? '/' + headerExtension.direction\n        : '') +\n      ' ' + headerExtension.uri + '\\r\\n';\n};\n\n// Parses an ftmp line, returns dictionary. Sample input:\n// a=fmtp:96 vbr=on;cng=on\n// Also deals with vbr=on; cng=on\nSDPUtils.parseFmtp = function(line) {\n  var parsed = {};\n  var kv;\n  var parts = line.substr(line.indexOf(' ') + 1).split(';');\n  for (var j = 0; j < parts.length; j++) {\n    kv = parts[j].trim().split('=');\n    parsed[kv[0].trim()] = kv[1];\n  }\n  return parsed;\n};\n\n// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeFmtp = function(codec) {\n  var line = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.parameters && Object.keys(codec.parameters).length) {\n    var params = [];\n    Object.keys(codec.parameters).forEach(function(param) {\n      if (codec.parameters[param]) {\n        params.push(param + '=' + codec.parameters[param]);\n      } else {\n        params.push(param);\n      }\n    });\n    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\\r\\n';\n  }\n  return line;\n};\n\n// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:\n// a=rtcp-fb:98 nack rpsi\nSDPUtils.parseRtcpFb = function(line) {\n  var parts = line.substr(line.indexOf(' ') + 1).split(' ');\n  return {\n    type: parts.shift(),\n    parameter: parts.join(' ')\n  };\n};\n// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeRtcpFb = function(codec) {\n  var lines = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {\n    // FIXME: special handling for trr-int?\n    codec.rtcpFeedback.forEach(function(fb) {\n      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +\n      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +\n          '\\r\\n';\n    });\n  }\n  return lines;\n};\n\n// Parses an RFC 5576 ssrc media attribute. Sample input:\n// a=ssrc:3735928559 cname:something\nSDPUtils.parseSsrcMedia = function(line) {\n  var sp = line.indexOf(' ');\n  var parts = {\n    ssrc: parseInt(line.substr(7, sp - 7), 10)\n  };\n  var colon = line.indexOf(':', sp);\n  if (colon > -1) {\n    parts.attribute = line.substr(sp + 1, colon - sp - 1);\n    parts.value = line.substr(colon + 1);\n  } else {\n    parts.attribute = line.substr(sp + 1);\n  }\n  return parts;\n};\n\nSDPUtils.parseSsrcGroup = function(line) {\n  var parts = line.substr(13).split(' ');\n  return {\n    semantics: parts.shift(),\n    ssrcs: parts.map(function(ssrc) {\n      return parseInt(ssrc, 10);\n    })\n  };\n};\n\n// Extracts the MID (RFC 5888) from a media section.\n// returns the MID or undefined if no mid line was found.\nSDPUtils.getMid = function(mediaSection) {\n  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];\n  if (mid) {\n    return mid.substr(6);\n  }\n};\n\nSDPUtils.parseFingerprint = function(line) {\n  var parts = line.substr(14).split(' ');\n  return {\n    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.\n    value: parts[1]\n  };\n};\n\n// Extracts DTLS parameters from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the fingerprint line as input. See also getIceParameters.\nSDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=fingerprint:');\n  // Note: a=setup line is ignored since we use the 'auto' role.\n  // Note2: 'algorithm' is not case sensitive except in Edge.\n  return {\n    role: 'auto',\n    fingerprints: lines.map(SDPUtils.parseFingerprint)\n  };\n};\n\n// Serializes DTLS parameters to SDP.\nSDPUtils.writeDtlsParameters = function(params, setupType) {\n  var sdp = 'a=setup:' + setupType + '\\r\\n';\n  params.fingerprints.forEach(function(fp) {\n    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\\r\\n';\n  });\n  return sdp;\n};\n\n// Parses a=crypto lines into\n//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#dictionary-rtcsrtpsdesparameters-members\nSDPUtils.parseCryptoLine = function(line) {\n  var parts = line.substr(9).split(' ');\n  return {\n    tag: parseInt(parts[0], 10),\n    cryptoSuite: parts[1],\n    keyParams: parts[2],\n    sessionParams: parts.slice(3),\n  };\n};\n\nSDPUtils.writeCryptoLine = function(parameters) {\n  return 'a=crypto:' + parameters.tag + ' ' +\n    parameters.cryptoSuite + ' ' +\n    (typeof parameters.keyParams === 'object'\n      ? SDPUtils.writeCryptoKeyParams(parameters.keyParams)\n      : parameters.keyParams) +\n    (parameters.sessionParams ? ' ' + parameters.sessionParams.join(' ') : '') +\n    '\\r\\n';\n};\n\n// Parses the crypto key parameters into\n//   https://rawgit.com/aboba/edgertc/master/msortc-rs4.html#rtcsrtpkeyparam*\nSDPUtils.parseCryptoKeyParams = function(keyParams) {\n  if (keyParams.indexOf('inline:') !== 0) {\n    return null;\n  }\n  var parts = keyParams.substr(7).split('|');\n  return {\n    keyMethod: 'inline',\n    keySalt: parts[0],\n    lifeTime: parts[1],\n    mkiValue: parts[2] ? parts[2].split(':')[0] : undefined,\n    mkiLength: parts[2] ? parts[2].split(':')[1] : undefined,\n  };\n};\n\nSDPUtils.writeCryptoKeyParams = function(keyParams) {\n  return keyParams.keyMethod + ':'\n    + keyParams.keySalt +\n    (keyParams.lifeTime ? '|' + keyParams.lifeTime : '') +\n    (keyParams.mkiValue && keyParams.mkiLength\n      ? '|' + keyParams.mkiValue + ':' + keyParams.mkiLength\n      : '');\n};\n\n// Extracts all SDES paramters.\nSDPUtils.getCryptoParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=crypto:');\n  return lines.map(SDPUtils.parseCryptoLine);\n};\n\n// Parses ICE information from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the ice-ufrag and ice-pwd lines as input.\nSDPUtils.getIceParameters = function(mediaSection, sessionpart) {\n  var ufrag = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=ice-ufrag:')[0];\n  var pwd = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=ice-pwd:')[0];\n  if (!(ufrag && pwd)) {\n    return null;\n  }\n  return {\n    usernameFragment: ufrag.substr(12),\n    password: pwd.substr(10),\n  };\n};\n\n// Serializes ICE parameters to SDP.\nSDPUtils.writeIceParameters = function(params) {\n  return 'a=ice-ufrag:' + params.usernameFragment + '\\r\\n' +\n      'a=ice-pwd:' + params.password + '\\r\\n';\n};\n\n// Parses the SDP media section and returns RTCRtpParameters.\nSDPUtils.parseRtpParameters = function(mediaSection) {\n  var description = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: [],\n    rtcp: []\n  };\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]\n    var pt = mline[i];\n    var rtpmapline = SDPUtils.matchPrefix(\n      mediaSection, 'a=rtpmap:' + pt + ' ')[0];\n    if (rtpmapline) {\n      var codec = SDPUtils.parseRtpMap(rtpmapline);\n      var fmtps = SDPUtils.matchPrefix(\n        mediaSection, 'a=fmtp:' + pt + ' ');\n      // Only the first a=fmtp:<pt> is considered.\n      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};\n      codec.rtcpFeedback = SDPUtils.matchPrefix(\n        mediaSection, 'a=rtcp-fb:' + pt + ' ')\n        .map(SDPUtils.parseRtcpFb);\n      description.codecs.push(codec);\n      // parse FEC mechanisms from rtpmap lines.\n      switch (codec.name.toUpperCase()) {\n        case 'RED':\n        case 'ULPFEC':\n          description.fecMechanisms.push(codec.name.toUpperCase());\n          break;\n        default: // only RED and ULPFEC are recognized as FEC mechanisms.\n          break;\n      }\n    }\n  }\n  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {\n    description.headerExtensions.push(SDPUtils.parseExtmap(line));\n  });\n  // FIXME: parse rtcp.\n  return description;\n};\n\n// Generates parts of the SDP media section describing the capabilities /\n// parameters.\nSDPUtils.writeRtpDescription = function(kind, caps) {\n  var sdp = '';\n\n  // Build the mline.\n  sdp += 'm=' + kind + ' ';\n  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.\n  sdp += ' UDP/TLS/RTP/SAVPF ';\n  sdp += caps.codecs.map(function(codec) {\n    if (codec.preferredPayloadType !== undefined) {\n      return codec.preferredPayloadType;\n    }\n    return codec.payloadType;\n  }).join(' ') + '\\r\\n';\n\n  sdp += 'c=IN IP4 0.0.0.0\\r\\n';\n  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\\r\\n';\n\n  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.\n  caps.codecs.forEach(function(codec) {\n    sdp += SDPUtils.writeRtpMap(codec);\n    sdp += SDPUtils.writeFmtp(codec);\n    sdp += SDPUtils.writeRtcpFb(codec);\n  });\n  var maxptime = 0;\n  caps.codecs.forEach(function(codec) {\n    if (codec.maxptime > maxptime) {\n      maxptime = codec.maxptime;\n    }\n  });\n  if (maxptime > 0) {\n    sdp += 'a=maxptime:' + maxptime + '\\r\\n';\n  }\n  sdp += 'a=rtcp-mux\\r\\n';\n\n  if (caps.headerExtensions) {\n    caps.headerExtensions.forEach(function(extension) {\n      sdp += SDPUtils.writeExtmap(extension);\n    });\n  }\n  // FIXME: write fecMechanisms.\n  return sdp;\n};\n\n// Parses the SDP media section and returns an array of\n// RTCRtpEncodingParameters.\nSDPUtils.parseRtpEncodingParameters = function(mediaSection) {\n  var encodingParameters = [];\n  var description = SDPUtils.parseRtpParameters(mediaSection);\n  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;\n  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;\n\n  // filter a=ssrc:... cname:, ignore PlanB-msid\n  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(parts) {\n      return parts.attribute === 'cname';\n    });\n  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;\n  var secondarySsrc;\n\n  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')\n    .map(function(line) {\n      var parts = line.substr(17).split(' ');\n      return parts.map(function(part) {\n        return parseInt(part, 10);\n      });\n    });\n  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {\n    secondarySsrc = flows[0][1];\n  }\n\n  description.codecs.forEach(function(codec) {\n    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {\n      var encParam = {\n        ssrc: primarySsrc,\n        codecPayloadType: parseInt(codec.parameters.apt, 10)\n      };\n      if (primarySsrc && secondarySsrc) {\n        encParam.rtx = {ssrc: secondarySsrc};\n      }\n      encodingParameters.push(encParam);\n      if (hasRed) {\n        encParam = JSON.parse(JSON.stringify(encParam));\n        encParam.fec = {\n          ssrc: primarySsrc,\n          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'\n        };\n        encodingParameters.push(encParam);\n      }\n    }\n  });\n  if (encodingParameters.length === 0 && primarySsrc) {\n    encodingParameters.push({\n      ssrc: primarySsrc\n    });\n  }\n\n  // we support both b=AS and b=TIAS but interpret AS as TIAS.\n  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');\n  if (bandwidth.length) {\n    if (bandwidth[0].indexOf('b=TIAS:') === 0) {\n      bandwidth = parseInt(bandwidth[0].substr(7), 10);\n    } else if (bandwidth[0].indexOf('b=AS:') === 0) {\n      // use formula from JSEP to convert b=AS to TIAS value.\n      bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95\n          - (50 * 40 * 8);\n    } else {\n      bandwidth = undefined;\n    }\n    encodingParameters.forEach(function(params) {\n      params.maxBitrate = bandwidth;\n    });\n  }\n  return encodingParameters;\n};\n\n// parses http://draft.ortc.org/#rtcrtcpparameters*\nSDPUtils.parseRtcpParameters = function(mediaSection) {\n  var rtcpParameters = {};\n\n  // Gets the first SSRC. Note tha with RTX there might be multiple\n  // SSRCs.\n  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(obj) {\n      return obj.attribute === 'cname';\n    })[0];\n  if (remoteSsrc) {\n    rtcpParameters.cname = remoteSsrc.value;\n    rtcpParameters.ssrc = remoteSsrc.ssrc;\n  }\n\n  // Edge uses the compound attribute instead of reducedSize\n  // compound is !reducedSize\n  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');\n  rtcpParameters.reducedSize = rsize.length > 0;\n  rtcpParameters.compound = rsize.length === 0;\n\n  // parses the rtcp-mux attrіbute.\n  // Note that Edge does not support unmuxed RTCP.\n  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');\n  rtcpParameters.mux = mux.length > 0;\n\n  return rtcpParameters;\n};\n\n// parses either a=msid: or a=ssrc:... msid lines and returns\n// the id of the MediaStream and MediaStreamTrack.\nSDPUtils.parseMsid = function(mediaSection) {\n  var parts;\n  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');\n  if (spec.length === 1) {\n    parts = spec[0].substr(7).split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(msidParts) {\n      return msidParts.attribute === 'msid';\n    });\n  if (planB.length > 0) {\n    parts = planB[0].value.split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n};\n\n// SCTP\n// parses draft-ietf-mmusic-sctp-sdp-26 first and falls back\n// to draft-ietf-mmusic-sctp-sdp-05\nSDPUtils.parseSctpDescription = function(mediaSection) {\n  var mline = SDPUtils.parseMLine(mediaSection);\n  var maxSizeLine = SDPUtils.matchPrefix(mediaSection, 'a=max-message-size:');\n  var maxMessageSize;\n  if (maxSizeLine.length > 0) {\n    maxMessageSize = parseInt(maxSizeLine[0].substr(19), 10);\n  }\n  if (isNaN(maxMessageSize)) {\n    maxMessageSize = 65536;\n  }\n  var sctpPort = SDPUtils.matchPrefix(mediaSection, 'a=sctp-port:');\n  if (sctpPort.length > 0) {\n    return {\n      port: parseInt(sctpPort[0].substr(12), 10),\n      protocol: mline.fmt,\n      maxMessageSize: maxMessageSize\n    };\n  }\n  var sctpMapLines = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:');\n  if (sctpMapLines.length > 0) {\n    var parts = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:')[0]\n      .substr(10)\n      .split(' ');\n    return {\n      port: parseInt(parts[0], 10),\n      protocol: parts[1],\n      maxMessageSize: maxMessageSize\n    };\n  }\n};\n\n// SCTP\n// outputs the draft-ietf-mmusic-sctp-sdp-26 version that all browsers\n// support by now receiving in this format, unless we originally parsed\n// as the draft-ietf-mmusic-sctp-sdp-05 format (indicated by the m-line\n// protocol of DTLS/SCTP -- without UDP/ or TCP/)\nSDPUtils.writeSctpDescription = function(media, sctp) {\n  var output = [];\n  if (media.protocol !== 'DTLS/SCTP') {\n    output = [\n      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.protocol + '\\r\\n',\n      'c=IN IP4 0.0.0.0\\r\\n',\n      'a=sctp-port:' + sctp.port + '\\r\\n'\n    ];\n  } else {\n    output = [\n      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.port + '\\r\\n',\n      'c=IN IP4 0.0.0.0\\r\\n',\n      'a=sctpmap:' + sctp.port + ' ' + sctp.protocol + ' 65535\\r\\n'\n    ];\n  }\n  if (sctp.maxMessageSize !== undefined) {\n    output.push('a=max-message-size:' + sctp.maxMessageSize + '\\r\\n');\n  }\n  return output.join('');\n};\n\n// Generate a session ID for SDP.\n// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1\n// recommends using a cryptographically random +ve 64-bit value\n// but right now this should be acceptable and within the right range\nSDPUtils.generateSessionId = function() {\n  return Math.random().toString().substr(2, 21);\n};\n\n// Write boilder plate for start of SDP\n// sessId argument is optional - if not supplied it will\n// be generated randomly\n// sessVersion is optional and defaults to 2\n// sessUser is optional and defaults to 'thisisadapterortc'\nSDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {\n  var sessionId;\n  var version = sessVer !== undefined ? sessVer : 2;\n  if (sessId) {\n    sessionId = sessId;\n  } else {\n    sessionId = SDPUtils.generateSessionId();\n  }\n  var user = sessUser || 'thisisadapterortc';\n  // FIXME: sess-id should be an NTP timestamp.\n  return 'v=0\\r\\n' +\n      'o=' + user + ' ' + sessionId + ' ' + version +\n        ' IN IP4 127.0.0.1\\r\\n' +\n      's=-\\r\\n' +\n      't=0 0\\r\\n';\n};\n\nSDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n    transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n    transceiver.dtlsTransport.getLocalParameters(),\n    type === 'offer' ? 'actpass' : 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.direction) {\n    sdp += 'a=' + transceiver.direction + '\\r\\n';\n  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    // spec.\n    var msid = 'msid:' + stream.id + ' ' +\n        transceiver.rtpSender.track.id + '\\r\\n';\n    sdp += 'a=' + msid;\n\n    // for Chrome.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n};\n\n// Gets the direction from the mediaSection or the sessionpart.\nSDPUtils.getDirection = function(mediaSection, sessionpart) {\n  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.\n  var lines = SDPUtils.splitLines(mediaSection);\n  for (var i = 0; i < lines.length; i++) {\n    switch (lines[i]) {\n      case 'a=sendrecv':\n      case 'a=sendonly':\n      case 'a=recvonly':\n      case 'a=inactive':\n        return lines[i].substr(2);\n      default:\n        // FIXME: What should happen here?\n    }\n  }\n  if (sessionpart) {\n    return SDPUtils.getDirection(sessionpart);\n  }\n  return 'sendrecv';\n};\n\nSDPUtils.getKind = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  return mline[0].substr(2);\n};\n\nSDPUtils.isRejected = function(mediaSection) {\n  return mediaSection.split(' ', 2)[1] === '0';\n};\n\nSDPUtils.parseMLine = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var parts = lines[0].substr(2).split(' ');\n  return {\n    kind: parts[0],\n    port: parseInt(parts[1], 10),\n    protocol: parts[2],\n    fmt: parts.slice(3).join(' ')\n  };\n};\n\nSDPUtils.parseOLine = function(mediaSection) {\n  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];\n  var parts = line.substr(2).split(' ');\n  return {\n    username: parts[0],\n    sessionId: parts[1],\n    sessionVersion: parseInt(parts[2], 10),\n    netType: parts[3],\n    addressType: parts[4],\n    address: parts[5]\n  };\n};\n\n// a very naive interpretation of a valid SDP.\nSDPUtils.isValidSDP = function(blob) {\n  if (typeof blob !== 'string' || blob.length === 0) {\n    return false;\n  }\n  var lines = SDPUtils.splitLines(blob);\n  for (var i = 0; i < lines.length; i++) {\n    if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {\n      return false;\n    }\n    // TODO: check the modifier a bit more.\n  }\n  return true;\n};\n\n// Expose public methods.\nif (typeof module === 'object') {\n  module.exports = 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