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* Description of import/upgrade into Moodle:\n *\n * 1. Visit https://github.com/webrtc/adapter/releases.\n * 2. Check if the version has been updated from what is listed in lib/thirdpartylibs.xml in the Moodle wwwroot.\n * 3. If it has -\n * 1. Download the source code.\n * 2. Copy the content of the file release/adapter.js from the archive (ignore the first line).\n * 3. Replace the content below \"return (function e(t,n,r) ..\" in this file with the content you copied.\n * 4. Ensure to update lib/thirdpartylibs.xml with any changes.\n */\n\n// ESLint directives.\n/* eslint-disable */\n\n// JSHint directives.\n/* jshint ignore:start */\n\ndefine([], function() {\nreturn (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){\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\n var SDPUtils = require('sdp');\n\n function 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\n function 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\n function 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.\n function 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\n function 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\n function 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\n function 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\n module.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 states[transceiver.iceTransport.state]++;\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 states[transceiver.iceTransport.state]++;\n states[transceiver.dtlsTransport.state]++;\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\n },{\"sdp\":2}],2:[function(require,module,exports){\n /* eslint-env node */\n 'use strict';\n\n // SDP helpers.\n var SDPUtils = {};\n\n // Generate an alphanumeric identifier for cname or mids.\n // TODO: use UUIDs instead? https://gist.github.com/jed/982883\n SDPUtils.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.\n SDPUtils.localCName = SDPUtils.generateIdentifier();\n\n // Splits SDP into lines, dealing with both CRLF and LF.\n SDPUtils.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.\n SDPUtils.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.\n SDPUtils.getDescription = function(blob) {\n var sections = SDPUtils.splitSections(blob);\n return sections && sections[0];\n };\n\n // returns the individual media sections.\n SDPUtils.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.\n SDPUtils.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\"\n SDPUtils.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.\n SDPUtils.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\n SDPUtils.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\n SDPUtils.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.\n SDPUtils.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\n SDPUtils.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.\n SDPUtils.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\n SDPUtils.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.\n SDPUtils.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\n SDPUtils.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.\n SDPUtils.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\n SDPUtils.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\n SDPUtils.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.\n SDPUtils.getMid = function(mediaSection) {\n var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];\n if (mid) {\n return mid.substr(6);\n }\n };\n\n SDPUtils.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.\n SDPUtils.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.\n SDPUtils.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 // 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.\n SDPUtils.getIceParameters = function(mediaSection, sessionpart) {\n var lines = SDPUtils.splitLines(mediaSection);\n // Search in session part, too.\n lines = lines.concat(SDPUtils.splitLines(sessionpart));\n var iceParameters = {\n usernameFragment: lines.filter(function(line) {\n return line.indexOf('a=ice-ufrag:') === 0;\n })[0].substr(12),\n password: lines.filter(function(line) {\n return line.indexOf('a=ice-pwd:') === 0;\n })[0].substr(10)\n };\n return iceParameters;\n };\n\n // Serializes ICE parameters to SDP.\n SDPUtils.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.\n SDPUtils.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.\n SDPUtils.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.\n SDPUtils.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*\n SDPUtils.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.\n SDPUtils.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 // 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\n SDPUtils.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'\n SDPUtils.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\n SDPUtils.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.\n SDPUtils.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\n SDPUtils.getKind = function(mediaSection) {\n var lines = SDPUtils.splitLines(mediaSection);\n var mline = lines[0].split(' ');\n return mline[0].substr(2);\n };\n\n SDPUtils.isRejected = function(mediaSection) {\n return mediaSection.split(' ', 2)[1] === '0';\n };\n\n SDPUtils.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\n SDPUtils.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.\n SDPUtils.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.\n if (typeof module === 'object') {\n module.exports = SDPUtils;\n }\n\n },{}],3:[function(require,module,exports){\n (function (global){\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\n var adapterFactory = require('./adapter_factory.js');\n module.exports = adapterFactory({window: global.window});\n\n }).call(this,typeof global !== \"undefined\" ? global : typeof self !== \"undefined\" ? self : typeof window !== \"undefined\" ? window : {})\n },{\"./adapter_factory.js\":4}],4:[function(require,module,exports){\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\n var utils = require('./utils');\n // Shimming starts here.\n module.exports = function(dependencies, opts) {\n var window = dependencies && dependencies.window;\n\n var options = {\n shimChrome: true,\n shimFirefox: true,\n shimEdge: true,\n shimSafari: true,\n };\n\n for (var key in opts) {\n if (hasOwnProperty.call(opts, key)) {\n options[key] = opts[key];\n }\n }\n\n // Utils.\n var logging = utils.log;\n var browserDetails = utils.detectBrowser(window);\n\n // Uncomment the line below if you want logging to occur, including logging\n // for the switch statement below. Can also be turned on in the browser via\n // adapter.disableLog(false), but then logging from the switch statement below\n // will not appear.\n // require('./utils').disableLog(false);\n\n // Browser shims.\n var chromeShim = require('./chrome/chrome_shim') || null;\n var edgeShim = require('./edge/edge_shim') || null;\n var firefoxShim = require('./firefox/firefox_shim') || null;\n var safariShim = require('./safari/safari_shim') || null;\n var commonShim = require('./common_shim') || null;\n\n // Export to the adapter global object visible in the browser.\n var adapter = {\n browserDetails: browserDetails,\n commonShim: 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 logging('adapter.js shimming chrome.');\n // Export to the adapter global object visible in the browser.\n adapter.browserShim = chromeShim;\n commonShim.shimCreateObjectURL(window);\n\n chromeShim.shimGetUserMedia(window);\n chromeShim.shimMediaStream(window);\n chromeShim.shimSourceObject(window);\n chromeShim.shimPeerConnection(window);\n chromeShim.shimOnTrack(window);\n chromeShim.shimAddTrackRemoveTrack(window);\n chromeShim.shimGetSendersWithDtmf(window);\n chromeShim.shimSenderReceiverGetStats(window);\n chromeShim.fixNegotiationNeeded(window);\n\n commonShim.shimRTCIceCandidate(window);\n commonShim.shimMaxMessageSize(window);\n commonShim.shimSendThrowTypeError(window);\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 commonShim.shimCreateObjectURL(window);\n\n firefoxShim.shimGetUserMedia(window);\n firefoxShim.shimSourceObject(window);\n firefoxShim.shimPeerConnection(window);\n firefoxShim.shimOnTrack(window);\n firefoxShim.shimRemoveStream(window);\n firefoxShim.shimSenderGetStats(window);\n firefoxShim.shimReceiverGetStats(window);\n firefoxShim.shimRTCDataChannel(window);\n\n commonShim.shimRTCIceCandidate(window);\n commonShim.shimMaxMessageSize(window);\n commonShim.shimSendThrowTypeError(window);\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 commonShim.shimCreateObjectURL(window);\n\n edgeShim.shimGetUserMedia(window);\n edgeShim.shimPeerConnection(window);\n edgeShim.shimReplaceTrack(window);\n\n // the edge shim implements the full RTCIceCandidate object.\n\n commonShim.shimMaxMessageSize(window);\n commonShim.shimSendThrowTypeError(window);\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 commonShim.shimCreateObjectURL(window);\n\n safariShim.shimRTCIceServerUrls(window);\n safariShim.shimCreateOfferLegacy(window);\n safariShim.shimCallbacksAPI(window);\n safariShim.shimLocalStreamsAPI(window);\n safariShim.shimRemoteStreamsAPI(window);\n safariShim.shimTrackEventTransceiver(window);\n safariShim.shimGetUserMedia(window);\n\n commonShim.shimRTCIceCandidate(window);\n commonShim.shimMaxMessageSize(window);\n commonShim.shimSendThrowTypeError(window);\n break;\n default:\n logging('Unsupported browser!');\n break;\n }\n\n return adapter;\n };\n\n },{\"./chrome/chrome_shim\":5,\"./common_shim\":7,\"./edge/edge_shim\":8,\"./firefox/firefox_shim\":11,\"./safari/safari_shim\":13,\"./utils\":14}],5:[function(require,module,exports){\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 var utils = require('../utils.js');\n var logging = utils.log;\n\n /* iterates the stats graph recursively. */\n 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(function(name) {\n if (name.endsWith('Id')) {\n walkStats(stats, stats.get(base[name]), resultSet);\n } else if (name.endsWith('Ids')) {\n base[name].forEach(function(id) {\n walkStats(stats, stats.get(id), resultSet);\n });\n }\n });\n }\n\n /* filter getStats for a sender/receiver track. */\n function filterStats(result, track, outbound) {\n var streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';\n var filteredResult = new Map();\n if (track === null) {\n return filteredResult;\n }\n var trackStats = [];\n result.forEach(function(value) {\n if (value.type === 'track' &&\n value.trackIdentifier === track.id) {\n trackStats.push(value);\n }\n });\n trackStats.forEach(function(trackStat) {\n result.forEach(function(stats) {\n if (stats.type === streamStatsType && stats.trackId === trackStat.id) {\n walkStats(result, stats, filteredResult);\n }\n });\n });\n return filteredResult;\n }\n\n module.exports = {\n shimGetUserMedia: require('./getusermedia'),\n shimMediaStream: function(window) {\n window.MediaStream = window.MediaStream || window.webkitMediaStream;\n },\n\n shimOnTrack: function(window) {\n if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in\n window.RTCPeerConnection.prototype)) {\n Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n get: function() {\n return this._ontrack;\n },\n set: function(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 var origSetRemoteDescription =\n window.RTCPeerConnection.prototype.setRemoteDescription;\n window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n var pc = this;\n if (!pc._ontrackpoly) {\n pc._ontrackpoly = function(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', function(te) {\n var receiver;\n if (window.RTCPeerConnection.prototype.getReceivers) {\n receiver = pc.getReceivers().find(function(r) {\n return r.track && r.track.id === te.track.id;\n });\n } else {\n receiver = {track: te.track};\n }\n\n var event = new Event('track');\n event.track = te.track;\n event.receiver = receiver;\n event.transceiver = {receiver: receiver};\n event.streams = [e.stream];\n pc.dispatchEvent(event);\n });\n e.stream.getTracks().forEach(function(track) {\n var receiver;\n if (window.RTCPeerConnection.prototype.getReceivers) {\n receiver = pc.getReceivers().find(function(r) {\n return r.track && r.track.id === track.id;\n });\n } else {\n receiver = {track: track};\n }\n var event = new Event('track');\n event.track = track;\n event.receiver = receiver;\n event.transceiver = {receiver: receiver};\n event.streams = [e.stream];\n pc.dispatchEvent(event);\n });\n };\n pc.addEventListener('addstream', pc._ontrackpoly);\n }\n return origSetRemoteDescription.apply(pc, 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', function(e) {\n if (!e.transceiver) {\n Object.defineProperty(e, 'transceiver',\n {value: {receiver: e.receiver}});\n }\n return e;\n });\n }\n },\n\n shimGetSendersWithDtmf: function(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 var shimSenderWithDtmf = function(pc, track) {\n return {\n track: 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() {\n this._senders = this._senders || [];\n return this._senders.slice(); // return a copy of the internal state.\n };\n var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n var pc = this;\n var sender = origAddTrack.apply(pc, arguments);\n if (!sender) {\n sender = shimSenderWithDtmf(pc, track);\n pc._senders.push(sender);\n }\n return sender;\n };\n\n var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n var pc = this;\n origRemoveTrack.apply(pc, arguments);\n var idx = pc._senders.indexOf(sender);\n if (idx !== -1) {\n pc._senders.splice(idx, 1);\n }\n };\n }\n var origAddStream = window.RTCPeerConnection.prototype.addStream;\n window.RTCPeerConnection.prototype.addStream = function(stream) {\n var pc = this;\n pc._senders = pc._senders || [];\n origAddStream.apply(pc, [stream]);\n stream.getTracks().forEach(function(track) {\n pc._senders.push(shimSenderWithDtmf(pc, track));\n });\n };\n\n var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n window.RTCPeerConnection.prototype.removeStream = function(stream) {\n var pc = this;\n pc._senders = pc._senders || [];\n origRemoveStream.apply(pc, [stream]);\n\n stream.getTracks().forEach(function(track) {\n var sender = pc._senders.find(function(s) {\n return s.track === track;\n });\n if (sender) {\n pc._senders.splice(pc._senders.indexOf(sender), 1); // remove sender\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 var origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n window.RTCPeerConnection.prototype.getSenders = function() {\n var pc = this;\n var senders = origGetSenders.apply(pc, []);\n senders.forEach(function(sender) {\n sender._pc = pc;\n });\n return senders;\n };\n\n Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n get: function() {\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\n shimSenderReceiverGetStats: function(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 var origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n if (origGetSenders) {\n window.RTCPeerConnection.prototype.getSenders = function() {\n var pc = this;\n var senders = origGetSenders.apply(pc, []);\n senders.forEach(function(sender) {\n sender._pc = pc;\n });\n return senders;\n };\n }\n\n var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n if (origAddTrack) {\n window.RTCPeerConnection.prototype.addTrack = function() {\n var sender = origAddTrack.apply(this, arguments);\n sender._pc = this;\n return sender;\n };\n }\n window.RTCRtpSender.prototype.getStats = function() {\n var sender = this;\n return this._pc.getStats().then(function(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 return filterStats(result, sender.track, true);\n });\n };\n }\n\n // shim receiver stats.\n if (!('getStats' in window.RTCRtpReceiver.prototype)) {\n var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n if (origGetReceivers) {\n window.RTCPeerConnection.prototype.getReceivers = function() {\n var pc = this;\n var receivers = origGetReceivers.apply(pc, []);\n receivers.forEach(function(receiver) {\n receiver._pc = pc;\n });\n return receivers;\n };\n }\n utils.wrapPeerConnectionEvent(window, 'track', function(e) {\n e.receiver._pc = e.srcElement;\n return e;\n });\n window.RTCRtpReceiver.prototype.getStats = function() {\n var receiver = this;\n return this._pc.getStats().then(function(result) {\n return filterStats(result, receiver.track, false);\n });\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 var origGetStats = window.RTCPeerConnection.prototype.getStats;\n window.RTCPeerConnection.prototype.getStats = function() {\n var pc = this;\n if (arguments.length > 0 &&\n arguments[0] instanceof window.MediaStreamTrack) {\n var track = arguments[0];\n var sender;\n var receiver;\n var err;\n pc.getSenders().forEach(function(s) {\n if (s.track === track) {\n if (sender) {\n err = true;\n } else {\n sender = s;\n }\n }\n });\n pc.getReceivers().forEach(function(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(pc, arguments);\n };\n },\n\n shimSourceObject: function(window) {\n var URL = window && window.URL;\n\n if (typeof window === 'object') {\n if (window.HTMLMediaElement &&\n !('srcObject' in window.HTMLMediaElement.prototype)) {\n // Shim the srcObject property, once, when HTMLMediaElement is found.\n Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {\n get: function() {\n return this._srcObject;\n },\n set: function(stream) {\n var self = this;\n // Use _srcObject as a private property for this shim\n this._srcObject = stream;\n if (this.src) {\n URL.revokeObjectURL(this.src);\n }\n\n if (!stream) {\n this.src = '';\n return undefined;\n }\n this.src = URL.createObjectURL(stream);\n // We need to recreate the blob url when a track is added or\n // removed. Doing it manually since we want to avoid a recursion.\n stream.addEventListener('addtrack', function() {\n if (self.src) {\n URL.revokeObjectURL(self.src);\n }\n self.src = URL.createObjectURL(stream);\n });\n stream.addEventListener('removetrack', function() {\n if (self.src) {\n URL.revokeObjectURL(self.src);\n }\n self.src = URL.createObjectURL(stream);\n });\n }\n });\n }\n }\n },\n\n shimAddTrackRemoveTrackWithNative: function(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 = function() {\n var pc = this;\n this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n return Object.keys(this._shimmedLocalStreams).map(function(streamId) {\n return pc._shimmedLocalStreams[streamId][0];\n });\n };\n\n var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n if (!stream) {\n return origAddTrack.apply(this, arguments);\n }\n this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n var 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 var origAddStream = window.RTCPeerConnection.prototype.addStream;\n window.RTCPeerConnection.prototype.addStream = function(stream) {\n var pc = this;\n this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n stream.getTracks().forEach(function(track) {\n var alreadyExists = pc.getSenders().find(function(s) {\n return s.track === track;\n });\n if (alreadyExists) {\n throw new DOMException('Track already exists.',\n 'InvalidAccessError');\n }\n });\n var existingSenders = pc.getSenders();\n origAddStream.apply(this, arguments);\n var newSenders = pc.getSenders().filter(function(newSender) {\n return existingSenders.indexOf(newSender) === -1;\n });\n this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);\n };\n\n var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n window.RTCPeerConnection.prototype.removeStream = function(stream) {\n this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n delete this._shimmedLocalStreams[stream.id];\n return origRemoveStream.apply(this, arguments);\n };\n\n var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n var pc = this;\n this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n if (sender) {\n Object.keys(this._shimmedLocalStreams).forEach(function(streamId) {\n var idx = pc._shimmedLocalStreams[streamId].indexOf(sender);\n if (idx !== -1) {\n pc._shimmedLocalStreams[streamId].splice(idx, 1);\n }\n if (pc._shimmedLocalStreams[streamId].length === 1) {\n delete pc._shimmedLocalStreams[streamId];\n }\n });\n }\n return origRemoveTrack.apply(this, arguments);\n };\n },\n\n shimAddTrackRemoveTrack: function(window) {\n var browserDetails = utils.detectBrowser(window);\n // shim addTrack and removeTrack.\n if (window.RTCPeerConnection.prototype.addTrack &&\n browserDetails.version >= 65) {\n return this.shimAddTrackRemoveTrackWithNative(window);\n }\n\n // also shim pc.getLocalStreams when addTrack is shimmed\n // to return the original streams.\n var origGetLocalStreams = window.RTCPeerConnection.prototype\n .getLocalStreams;\n window.RTCPeerConnection.prototype.getLocalStreams = function() {\n var pc = this;\n var nativeStreams = origGetLocalStreams.apply(this);\n pc._reverseStreams = pc._reverseStreams || {};\n return nativeStreams.map(function(stream) {\n return pc._reverseStreams[stream.id];\n });\n };\n\n var origAddStream = window.RTCPeerConnection.prototype.addStream;\n window.RTCPeerConnection.prototype.addStream = function(stream) {\n var pc = this;\n pc._streams = pc._streams || {};\n pc._reverseStreams = pc._reverseStreams || {};\n\n stream.getTracks().forEach(function(track) {\n var alreadyExists = pc.getSenders().find(function(s) {\n return s.track === track;\n });\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 (!pc._reverseStreams[stream.id]) {\n var newStream = new window.MediaStream(stream.getTracks());\n pc._streams[stream.id] = newStream;\n pc._reverseStreams[newStream.id] = stream;\n stream = newStream;\n }\n origAddStream.apply(pc, [stream]);\n };\n\n var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n window.RTCPeerConnection.prototype.removeStream = function(stream) {\n var pc = this;\n pc._streams = pc._streams || {};\n pc._reverseStreams = pc._reverseStreams || {};\n\n origRemoveStream.apply(pc, [(pc._streams[stream.id] || stream)]);\n delete pc._reverseStreams[(pc._streams[stream.id] ?\n pc._streams[stream.id].id : stream.id)];\n delete pc._streams[stream.id];\n };\n\n window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n var pc = this;\n if (pc.signalingState === 'closed') {\n throw new DOMException(\n 'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n 'InvalidStateError');\n }\n var streams = [].slice.call(arguments, 1);\n if (streams.length !== 1 ||\n !streams[0].getTracks().find(function(t) {\n return t === track;\n })) {\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 var alreadyExists = pc.getSenders().find(function(s) {\n return s.track === track;\n });\n if (alreadyExists) {\n throw new DOMException('Track already exists.',\n 'InvalidAccessError');\n }\n\n pc._streams = pc._streams || {};\n pc._reverseStreams = pc._reverseStreams || {};\n var oldStream = pc._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(function() {\n pc.dispatchEvent(new Event('negotiationneeded'));\n });\n } else {\n var newStream = new window.MediaStream([track]);\n pc._streams[stream.id] = newStream;\n pc._reverseStreams[newStream.id] = stream;\n pc.addStream(newStream);\n }\n return pc.getSenders().find(function(s) {\n return s.track === track;\n });\n };\n\n // replace the internal stream id with the external one and\n // vice versa.\n function replaceInternalStreamId(pc, description) {\n var sdp = description.sdp;\n Object.keys(pc._reverseStreams || []).forEach(function(internalId) {\n var externalStream = pc._reverseStreams[internalId];\n var 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: sdp\n });\n }\n function replaceExternalStreamId(pc, description) {\n var sdp = description.sdp;\n Object.keys(pc._reverseStreams || []).forEach(function(internalId) {\n var externalStream = pc._reverseStreams[internalId];\n var 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: sdp\n });\n }\n ['createOffer', 'createAnswer'].forEach(function(method) {\n var nativeMethod = window.RTCPeerConnection.prototype[method];\n window.RTCPeerConnection.prototype[method] = function() {\n var pc = this;\n var args = arguments;\n var isLegacyCall = arguments.length &&\n typeof arguments[0] === 'function';\n if (isLegacyCall) {\n return nativeMethod.apply(pc, [\n function(description) {\n var desc = replaceInternalStreamId(pc, description);\n args[0].apply(null, [desc]);\n },\n function(err) {\n if (args[1]) {\n args[1].apply(null, err);\n }\n }, arguments[2]\n ]);\n }\n return nativeMethod.apply(pc, arguments)\n .then(function(description) {\n return replaceInternalStreamId(pc, description);\n });\n };\n });\n\n var origSetLocalDescription =\n window.RTCPeerConnection.prototype.setLocalDescription;\n window.RTCPeerConnection.prototype.setLocalDescription = function() {\n var pc = this;\n if (!arguments.length || !arguments[0].type) {\n return origSetLocalDescription.apply(pc, arguments);\n }\n arguments[0] = replaceExternalStreamId(pc, arguments[0]);\n return origSetLocalDescription.apply(pc, arguments);\n };\n\n // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier\n\n var origLocalDescription = Object.getOwnPropertyDescriptor(\n window.RTCPeerConnection.prototype, 'localDescription');\n Object.defineProperty(window.RTCPeerConnection.prototype,\n 'localDescription', {\n get: function() {\n var pc = this;\n var description = origLocalDescription.get.apply(this);\n if (description.type === '') {\n return description;\n }\n return replaceInternalStreamId(pc, description);\n }\n });\n\n window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n var pc = this;\n if (pc.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 var isLocal = sender._pc === pc;\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 pc._streams = pc._streams || {};\n var stream;\n Object.keys(pc._streams).forEach(function(streamid) {\n var hasTrack = pc._streams[streamid].getTracks().find(function(track) {\n return sender.track === track;\n });\n if (hasTrack) {\n stream = pc._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 pc.removeStream(pc._reverseStreams[stream.id]);\n } else {\n // relying on the same odd chrome behaviour as above.\n stream.removeTrack(sender.track);\n }\n pc.dispatchEvent(new Event('negotiationneeded'));\n }\n };\n },\n\n shimPeerConnection: function(window) {\n var browserDetails = utils.detectBrowser(window);\n\n // The RTCPeerConnection object.\n if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {\n window.RTCPeerConnection = function(pcConfig, pcConstraints) {\n // Translate iceTransportPolicy to iceTransports,\n // see https://code.google.com/p/webrtc/issues/detail?id=4869\n // this was fixed in M56 along with unprefixing RTCPeerConnection.\n logging('PeerConnection');\n if (pcConfig && pcConfig.iceTransportPolicy) {\n pcConfig.iceTransports = pcConfig.iceTransportPolicy;\n }\n\n return new window.webkitRTCPeerConnection(pcConfig, pcConstraints);\n };\n window.RTCPeerConnection.prototype =\n window.webkitRTCPeerConnection.prototype;\n // wrap static methods. Currently just generateCertificate.\n if (window.webkitRTCPeerConnection.generateCertificate) {\n Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n get: function() {\n return window.webkitRTCPeerConnection.generateCertificate;\n }\n });\n }\n }\n\n var origGetStats = window.RTCPeerConnection.prototype.getStats;\n window.RTCPeerConnection.prototype.getStats = function(selector,\n successCallback, errorCallback) {\n var pc = this;\n var args = 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 arguments[0] !== 'function')) {\n return origGetStats.apply(this, []);\n }\n\n var fixChromeStats_ = function(response) {\n var standardReport = {};\n var reports = response.result();\n reports.forEach(function(report) {\n var 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(function(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 var makeMapStats = function(stats) {\n return new Map(Object.keys(stats).map(function(key) {\n return [key, stats[key]];\n }));\n };\n\n if (arguments.length >= 2) {\n var successCallbackWrapper_ = function(response) {\n args[1](makeMapStats(fixChromeStats_(response)));\n };\n\n return origGetStats.apply(this, [successCallbackWrapper_,\n arguments[0]]);\n }\n\n // promise-support\n return new Promise(function(resolve, reject) {\n origGetStats.apply(pc, [\n function(response) {\n resolve(makeMapStats(fixChromeStats_(response)));\n }, reject]);\n }).then(successCallback, errorCallback);\n };\n\n // add promise support -- natively available in Chrome 51\n if (browserDetails.version < 51) {\n ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n .forEach(function(method) {\n var nativeMethod = window.RTCPeerConnection.prototype[method];\n window.RTCPeerConnection.prototype[method] = function() {\n var args = arguments;\n var pc = this;\n var promise = new Promise(function(resolve, reject) {\n nativeMethod.apply(pc, [args[0], resolve, reject]);\n });\n if (args.length < 2) {\n return promise;\n }\n return promise.then(function() {\n args[1].apply(null, []);\n },\n function(err) {\n if (args.length >= 3) {\n args[2].apply(null, [err]);\n }\n });\n };\n });\n }\n\n // promise support for createOffer and createAnswer. Available (without\n // bugs) since M52: crbug/619289\n if (browserDetails.version < 52) {\n ['createOffer', 'createAnswer'].forEach(function(method) {\n var nativeMethod = window.RTCPeerConnection.prototype[method];\n window.RTCPeerConnection.prototype[method] = function() {\n var pc = this;\n if (arguments.length < 1 || (arguments.length === 1 &&\n typeof arguments[0] === 'object')) {\n var opts = arguments.length === 1 ? arguments[0] : undefined;\n return new Promise(function(resolve, reject) {\n nativeMethod.apply(pc, [resolve, reject, opts]);\n });\n }\n return nativeMethod.apply(this, arguments);\n };\n });\n }\n\n // shim implicit creation of RTCSessionDescription/RTCIceCandidate\n ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n .forEach(function(method) {\n var nativeMethod = window.RTCPeerConnection.prototype[method];\n window.RTCPeerConnection.prototype[method] = function() {\n arguments[0] = new ((method === 'addIceCandidate') ?\n window.RTCIceCandidate :\n window.RTCSessionDescription)(arguments[0]);\n return nativeMethod.apply(this, arguments);\n };\n });\n\n // support for addIceCandidate(null or undefined)\n var nativeAddIceCandidate =\n window.RTCPeerConnection.prototype.addIceCandidate;\n window.RTCPeerConnection.prototype.addIceCandidate = function() {\n if (!arguments[0]) {\n if (arguments[1]) {\n arguments[1].apply(null);\n }\n return Promise.resolve();\n }\n return nativeAddIceCandidate.apply(this, arguments);\n };\n },\n\n fixNegotiationNeeded: function(window) {\n utils.wrapPeerConnectionEvent(window, 'negotiationneeded', function(e) {\n var pc = e.target;\n if (pc.signalingState !== 'stable') {\n return;\n }\n return e;\n });\n },\n\n shimGetDisplayMedia: function(window, getSourceId) {\n if ('getDisplayMedia' in window.navigator) {\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 navigator.getDisplayMedia = function(constraints) {\n return getSourceId(constraints)\n .then(function(sourceId) {\n constraints.video = {\n mandatory: {\n chromeMediaSource: 'desktop',\n chromeMediaSourceId: sourceId,\n maxFrameRate: constraints.video.frameRate || 3\n }\n };\n return navigator.mediaDevices.getUserMedia(constraints);\n });\n };\n }\n };\n\n },{\"../utils.js\":14,\"./getusermedia\":6}],6:[function(require,module,exports){\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 var utils = require('../utils.js');\n var logging = utils.log;\n\n // Expose public methods.\n module.exports = function(window) {\n var browserDetails = utils.detectBrowser(window);\n var navigator = window && window.navigator;\n\n var constraintsToChrome_ = function(c) {\n if (typeof c !== 'object' || c.mandatory || c.optional) {\n return c;\n }\n var cc = {};\n Object.keys(c).forEach(function(key) {\n if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n return;\n }\n var 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 var 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 var 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(function(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 var 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 var 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 var face = constraints.video.facingMode;\n face = face && ((typeof face === 'object') ? face : {ideal: face});\n var 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 var 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(function(devices) {\n devices = devices.filter(function(d) {\n return d.kind === 'videoinput';\n });\n var dev = devices.find(function(d) {\n return matches.some(function(match) {\n return d.label.toLowerCase().indexOf(match) !== -1;\n });\n });\n if (!dev && devices.length && matches.indexOf('back') !== -1) {\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 var 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: function() {\n return this.name + (this.message && ': ') + this.message;\n }\n };\n };\n\n var getUserMedia_ = function(constraints, onSuccess, onError) {\n shimConstraints_(constraints, function(c) {\n navigator.webkitGetUserMedia(c, onSuccess, function(e) {\n if (onError) {\n onError(shimError_(e));\n }\n });\n });\n };\n\n navigator.getUserMedia = getUserMedia_;\n\n // Returns the result of getUserMedia as a Promise.\n var getUserMediaPromise_ = function(constraints) {\n return new Promise(function(resolve, reject) {\n navigator.getUserMedia(constraints, resolve, reject);\n });\n };\n\n if (!navigator.mediaDevices) {\n navigator.mediaDevices = {\n getUserMedia: getUserMediaPromise_,\n enumerateDevices: function() {\n return new Promise(function(resolve) {\n var kinds = {audio: 'audioinput', video: 'videoinput'};\n return window.MediaStreamTrack.getSources(function(devices) {\n resolve(devices.map(function(device) {\n return {label: device.label,\n kind: kinds[device.kind],\n deviceId: device.id,\n groupId: ''};\n }));\n });\n });\n },\n getSupportedConstraints: function() {\n return {\n deviceId: true, echoCancellation: true, facingMode: true,\n frameRate: true, height: true, width: true\n };\n }\n };\n }\n\n // A shim for getUserMedia method on the mediaDevices object.\n // TODO(KaptenJansson) remove once implemented in Chrome stable.\n if (!navigator.mediaDevices.getUserMedia) {\n navigator.mediaDevices.getUserMedia = function(constraints) {\n return getUserMediaPromise_(constraints);\n };\n } else {\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 var origGetUserMedia = navigator.mediaDevices.getUserMedia.\n bind(navigator.mediaDevices);\n navigator.mediaDevices.getUserMedia = function(cs) {\n return shimConstraints_(cs, function(c) {\n return origGetUserMedia(c).then(function(stream) {\n if (c.audio && !stream.getAudioTracks().length ||\n c.video && !stream.getVideoTracks().length) {\n stream.getTracks().forEach(function(track) {\n track.stop();\n });\n throw new DOMException('', 'NotFoundError');\n }\n return stream;\n }, function(e) {\n return Promise.reject(shimError_(e));\n });\n });\n };\n }\n\n // Dummy devicechange event methods.\n // TODO(KaptenJansson) remove once implemented in Chrome stable.\n if (typeof navigator.mediaDevices.addEventListener === 'undefined') {\n navigator.mediaDevices.addEventListener = function() {\n logging('Dummy mediaDevices.addEventListener called.');\n };\n }\n if (typeof navigator.mediaDevices.removeEventListener === 'undefined') {\n navigator.mediaDevices.removeEventListener = function() {\n logging('Dummy mediaDevices.removeEventListener called.');\n };\n }\n };\n\n },{\"../utils.js\":14}],7:[function(require,module,exports){\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\n var SDPUtils = require('sdp');\n var utils = require('./utils');\n\n module.exports = {\n shimRTCIceCandidate: function(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 var NativeRTCIceCandidate = window.RTCIceCandidate;\n window.RTCIceCandidate = function(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 var nativeCandidate = new NativeRTCIceCandidate(args);\n var parsedCandidate = SDPUtils.parseCandidate(args.candidate);\n var augmentedCandidate = Object.assign(nativeCandidate,\n parsedCandidate);\n\n // Add a serializer that does not serialize the extra attributes.\n augmentedCandidate.toJSON = function() {\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', function(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\n // shimCreateObjectURL must be called before shimSourceObject to avoid loop.\n\n shimCreateObjectURL: function(window) {\n var URL = window && window.URL;\n\n if (!(typeof window === 'object' && window.HTMLMediaElement &&\n 'srcObject' in window.HTMLMediaElement.prototype &&\n URL.createObjectURL && URL.revokeObjectURL)) {\n // Only shim CreateObjectURL using srcObject if srcObject exists.\n return undefined;\n }\n\n var nativeCreateObjectURL = URL.createObjectURL.bind(URL);\n var nativeRevokeObjectURL = URL.revokeObjectURL.bind(URL);\n var streams = new Map(), newId = 0;\n\n URL.createObjectURL = function(stream) {\n if ('getTracks' in stream) {\n var url = 'polyblob:' + (++newId);\n streams.set(url, stream);\n utils.deprecated('URL.createObjectURL(stream)',\n 'elem.srcObject = stream');\n return url;\n }\n return nativeCreateObjectURL(stream);\n };\n URL.revokeObjectURL = function(url) {\n nativeRevokeObjectURL(url);\n streams.delete(url);\n };\n\n var dsc = Object.getOwnPropertyDescriptor(window.HTMLMediaElement.prototype,\n 'src');\n Object.defineProperty(window.HTMLMediaElement.prototype, 'src', {\n get: function() {\n return dsc.get.apply(this);\n },\n set: function(url) {\n this.srcObject = streams.get(url) || null;\n return dsc.set.apply(this, [url]);\n }\n });\n\n var nativeSetAttribute = window.HTMLMediaElement.prototype.setAttribute;\n window.HTMLMediaElement.prototype.setAttribute = function() {\n if (arguments.length === 2 &&\n ('' + arguments[0]).toLowerCase() === 'src') {\n this.srcObject = streams.get(arguments[1]) || null;\n }\n return nativeSetAttribute.apply(this, arguments);\n };\n },\n\n shimMaxMessageSize: function(window) {\n if (window.RTCSctpTransport || !window.RTCPeerConnection) {\n return;\n }\n var browserDetails = utils.detectBrowser(window);\n\n if (!('sctp' in window.RTCPeerConnection.prototype)) {\n Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {\n get: function() {\n return typeof this._sctp === 'undefined' ? null : this._sctp;\n }\n });\n }\n\n var sctpInDescription = function(description) {\n var sections = SDPUtils.splitSections(description.sdp);\n sections.shift();\n return sections.some(function(mediaSection) {\n var mLine = SDPUtils.parseMLine(mediaSection);\n return mLine && mLine.kind === 'application'\n && mLine.protocol.indexOf('SCTP') !== -1;\n });\n };\n\n var getRemoteFirefoxVersion = function(description) {\n // TODO: Is there a better solution for detecting Firefox?\n var match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\\d+)/);\n if (match === null || match.length < 2) {\n return -1;\n }\n var version = parseInt(match[1], 10);\n // Test for NaN (yes, this is ugly)\n return version !== version ? -1 : version;\n };\n\n var 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 var 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 var 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 var 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 var match = SDPUtils.matchPrefix(description.sdp, '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 var origSetRemoteDescription =\n window.RTCPeerConnection.prototype.setRemoteDescription;\n window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n var pc = this;\n pc._sctp = null;\n\n if (sctpInDescription(arguments[0])) {\n // Check if the remote is FF.\n var isFirefox = getRemoteFirefoxVersion(arguments[0]);\n\n // Get the maximum message size the local peer is capable of sending\n var canSendMMS = getCanSendMaxMessageSize(isFirefox);\n\n // Get the maximum message size of the remote peer.\n var remoteMMS = getMaxMessageSize(arguments[0], isFirefox);\n\n // Determine final maximum message size\n var 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 var sctp = {};\n Object.defineProperty(sctp, 'maxMessageSize', {\n get: function() {\n return maxMessageSize;\n }\n });\n pc._sctp = sctp;\n }\n\n return origSetRemoteDescription.apply(pc, arguments);\n };\n },\n\n shimSendThrowTypeError: function(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 var origDataChannelSend = dc.send;\n dc.send = function() {\n var data = arguments[0];\n var 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 var origCreateDataChannel =\n window.RTCPeerConnection.prototype.createDataChannel;\n window.RTCPeerConnection.prototype.createDataChannel = function() {\n var pc = this;\n var dataChannel = origCreateDataChannel.apply(pc, arguments);\n wrapDcSend(dataChannel, pc);\n return dataChannel;\n };\n utils.wrapPeerConnectionEvent(window, 'datachannel', function(e) {\n wrapDcSend(e.channel, e.target);\n return e;\n });\n }\n };\n\n },{\"./utils\":14,\"sdp\":2}],8:[function(require,module,exports){\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\n var utils = require('../utils');\n var filterIceServers = require('./filtericeservers');\n var shimRTCPeerConnection = require('rtcpeerconnection-shim');\n\n module.exports = {\n shimGetUserMedia: require('./getusermedia'),\n shimPeerConnection: function(window) {\n var browserDetails = utils.detectBrowser(window);\n\n if (window.RTCIceGatherer) {\n if (!window.RTCIceCandidate) {\n window.RTCIceCandidate = function(args) {\n return args;\n };\n }\n if (!window.RTCSessionDescription) {\n window.RTCSessionDescription = function(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 var origMSTEnabled = Object.getOwnPropertyDescriptor(\n window.MediaStreamTrack.prototype, 'enabled');\n Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {\n set: function(value) {\n origMSTEnabled.set.call(this, value);\n var 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: function() {\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 var RTCPeerConnectionShim = shimRTCPeerConnection(window,\n browserDetails.version);\n window.RTCPeerConnection = function(config) {\n if (config && config.iceServers) {\n config.iceServers = filterIceServers(config.iceServers);\n }\n return new RTCPeerConnectionShim(config);\n };\n window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;\n },\n shimReplaceTrack: function(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\n },{\"../utils\":14,\"./filtericeservers\":9,\"./getusermedia\":10,\"rtcpeerconnection-shim\":1}],9:[function(require,module,exports){\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\n var utils = require('../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\n module.exports = function(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 utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\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 },{\"../utils\":14}],10:[function(require,module,exports){\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\n // Expose public methods.\n module.exports = function(window) {\n var navigator = window && window.navigator;\n\n var shimError_ = function(e) {\n return {\n name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,\n message: e.message,\n constraint: e.constraint,\n toString: function() {\n return this.name;\n }\n };\n };\n\n // getUserMedia error shim.\n var origGetUserMedia = navigator.mediaDevices.getUserMedia.\n bind(navigator.mediaDevices);\n navigator.mediaDevices.getUserMedia = function(c) {\n return origGetUserMedia(c).catch(function(e) {\n return Promise.reject(shimError_(e));\n });\n };\n };\n\n },{}],11:[function(require,module,exports){\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\n var utils = require('../utils');\n\n module.exports = {\n shimGetUserMedia: require('./getusermedia'),\n shimOnTrack: function(window) {\n if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in\n window.RTCPeerConnection.prototype)) {\n Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n get: function() {\n return this._ontrack;\n },\n set: function(f) {\n if (this._ontrack) {\n this.removeEventListener('track', this._ontrack);\n this.removeEventListener('addstream', this._ontrackpoly);\n }\n this.addEventListener('track', this._ontrack = f);\n this.addEventListener('addstream', this._ontrackpoly = function(e) {\n e.stream.getTracks().forEach(function(track) {\n var event = new Event('track');\n event.track = track;\n event.receiver = {track: track};\n event.transceiver = {receiver: event.receiver};\n event.streams = [e.stream];\n this.dispatchEvent(event);\n }.bind(this));\n }.bind(this));\n },\n enumerable: true,\n configurable: true\n });\n }\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: function() {\n return {receiver: this.receiver};\n }\n });\n }\n },\n\n shimSourceObject: function(window) {\n // Firefox has supported mozSrcObject since FF22, unprefixed in 42.\n if (typeof window === 'object') {\n if (window.HTMLMediaElement &&\n !('srcObject' in window.HTMLMediaElement.prototype)) {\n // Shim the srcObject property, once, when HTMLMediaElement is found.\n Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {\n get: function() {\n return this.mozSrcObject;\n },\n set: function(stream) {\n this.mozSrcObject = stream;\n }\n });\n }\n }\n },\n\n shimPeerConnection: function(window) {\n var browserDetails = utils.detectBrowser(window);\n\n if (typeof window !== 'object' || !(window.RTCPeerConnection ||\n window.mozRTCPeerConnection)) {\n return; // probably media.peerconnection.enabled=false in about:config\n }\n // The RTCPeerConnection object.\n if (!window.RTCPeerConnection) {\n window.RTCPeerConnection = function(pcConfig, pcConstraints) {\n if (browserDetails.version < 38) {\n // .urls is not supported in FF < 38.\n // create RTCIceServers with a single url.\n if (pcConfig && pcConfig.iceServers) {\n var newIceServers = [];\n for (var i = 0; i < pcConfig.iceServers.length; i++) {\n var server = pcConfig.iceServers[i];\n if (server.hasOwnProperty('urls')) {\n for (var j = 0; j < server.urls.length; j++) {\n var newServer = {\n url: server.urls[j]\n };\n if (server.urls[j].indexOf('turn') === 0) {\n newServer.username = server.username;\n newServer.credential = server.credential;\n }\n newIceServers.push(newServer);\n }\n } else {\n newIceServers.push(pcConfig.iceServers[i]);\n }\n }\n pcConfig.iceServers = newIceServers;\n }\n }\n return new window.mozRTCPeerConnection(pcConfig, pcConstraints);\n };\n window.RTCPeerConnection.prototype =\n window.mozRTCPeerConnection.prototype;\n\n // wrap static methods. Currently just generateCertificate.\n if (window.mozRTCPeerConnection.generateCertificate) {\n Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n get: function() {\n return window.mozRTCPeerConnection.generateCertificate;\n }\n });\n }\n\n window.RTCSessionDescription = window.mozRTCSessionDescription;\n window.RTCIceCandidate = window.mozRTCIceCandidate;\n }\n\n // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.\n ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n .forEach(function(method) {\n var nativeMethod = window.RTCPeerConnection.prototype[method];\n window.RTCPeerConnection.prototype[method] = function() {\n arguments[0] = new ((method === 'addIceCandidate') ?\n window.RTCIceCandidate :\n window.RTCSessionDescription)(arguments[0]);\n return nativeMethod.apply(this, arguments);\n };\n });\n\n // support for addIceCandidate(null or undefined)\n var nativeAddIceCandidate =\n window.RTCPeerConnection.prototype.addIceCandidate;\n window.RTCPeerConnection.prototype.addIceCandidate = function() {\n if (!arguments[0]) {\n if (arguments[1]) {\n arguments[1].apply(null);\n }\n return Promise.resolve();\n }\n return nativeAddIceCandidate.apply(this, arguments);\n };\n\n // shim getStats with maplike support\n var makeMapStats = function(stats) {\n var map = new Map();\n Object.keys(stats).forEach(function(key) {\n map.set(key, stats[key]);\n map[key] = stats[key];\n });\n return map;\n };\n\n var modernStatsTypes = {\n inboundrtp: 'inbound-rtp',\n outboundrtp: 'outbound-rtp',\n candidatepair: 'candidate-pair',\n localcandidate: 'local-candidate',\n remotecandidate: 'remote-candidate'\n };\n\n var nativeGetStats = window.RTCPeerConnection.prototype.getStats;\n window.RTCPeerConnection.prototype.getStats = function(\n selector,\n onSucc,\n onErr\n ) {\n return nativeGetStats.apply(this, [selector || null])\n .then(function(stats) {\n if (browserDetails.version < 48) {\n stats = makeMapStats(stats);\n }\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(function(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(function(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\n shimSenderGetStats: function(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 var origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n if (origGetSenders) {\n window.RTCPeerConnection.prototype.getSenders = function() {\n var pc = this;\n var senders = origGetSenders.apply(pc, []);\n senders.forEach(function(sender) {\n sender._pc = pc;\n });\n return senders;\n };\n }\n\n var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n if (origAddTrack) {\n window.RTCPeerConnection.prototype.addTrack = function() {\n var sender = origAddTrack.apply(this, arguments);\n sender._pc = this;\n return sender;\n };\n }\n window.RTCRtpSender.prototype.getStats = function() {\n return this.track ? this._pc.getStats(this.track) :\n Promise.resolve(new Map());\n };\n },\n\n shimReceiverGetStats: function(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 var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n if (origGetReceivers) {\n window.RTCPeerConnection.prototype.getReceivers = function() {\n var pc = this;\n var receivers = origGetReceivers.apply(pc, []);\n receivers.forEach(function(receiver) {\n receiver._pc = pc;\n });\n return receivers;\n };\n }\n utils.wrapPeerConnectionEvent(window, 'track', function(e) {\n e.receiver._pc = e.srcElement;\n return e;\n });\n window.RTCRtpReceiver.prototype.getStats = function() {\n return this._pc.getStats(this.track);\n };\n },\n\n shimRemoveStream: function(window) {\n if (!window.RTCPeerConnection ||\n 'removeStream' in window.RTCPeerConnection.prototype) {\n return;\n }\n window.RTCPeerConnection.prototype.removeStream = function(stream) {\n var pc = this;\n utils.deprecated('removeStream', 'removeTrack');\n this.getSenders().forEach(function(sender) {\n if (sender.track && stream.getTracks().indexOf(sender.track) !== -1) {\n pc.removeTrack(sender);\n }\n });\n };\n },\n\n shimRTCDataChannel: function(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\n shimGetDisplayMedia: function(window, preferredMediaSource) {\n if ('getDisplayMedia' in window.navigator) {\n return;\n }\n navigator.getDisplayMedia = function(constraints) {\n if (!(constraints && constraints.video)) {\n var 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 navigator.mediaDevices.getUserMedia(constraints);\n };\n }\n };\n\n },{\"../utils\":14,\"./getusermedia\":12}],12:[function(require,module,exports){\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\n var utils = require('../utils');\n var logging = utils.log;\n\n // Expose public methods.\n module.exports = function(window) {\n var browserDetails = utils.detectBrowser(window);\n var navigator = window && window.navigator;\n var MediaStreamTrack = window && window.MediaStreamTrack;\n\n var shimError_ = function(e) {\n return {\n name: {\n InternalError: 'NotReadableError',\n NotSupportedError: 'TypeError',\n PermissionDeniedError: 'NotAllowedError',\n SecurityError: 'NotAllowedError'\n }[e.name] || e.name,\n message: {\n 'The operation is insecure.': 'The request is not allowed by the ' +\n 'user agent or the platform in the current context.'\n }[e.message] || e.message,\n constraint: e.constraint,\n toString: function() {\n return this.name + (this.message && ': ') + this.message;\n }\n };\n };\n\n // getUserMedia constraints shim.\n var getUserMedia_ = function(constraints, onSuccess, onError) {\n var constraintsToFF37_ = function(c) {\n if (typeof c !== 'object' || c.require) {\n return c;\n }\n var require = [];\n Object.keys(c).forEach(function(key) {\n if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n return;\n }\n var r = c[key] = (typeof c[key] === 'object') ?\n c[key] : {ideal: c[key]};\n if (r.min !== undefined ||\n r.max !== undefined || r.exact !== undefined) {\n require.push(key);\n }\n if (r.exact !== undefined) {\n if (typeof r.exact === 'number') {\n r. min = r.max = r.exact;\n } else {\n c[key] = r.exact;\n }\n delete r.exact;\n }\n if (r.ideal !== undefined) {\n c.advanced = c.advanced || [];\n var oc = {};\n if (typeof r.ideal === 'number') {\n oc[key] = {min: r.ideal, max: r.ideal};\n } else {\n oc[key] = r.ideal;\n }\n c.advanced.push(oc);\n delete r.ideal;\n if (!Object.keys(r).length) {\n delete c[key];\n }\n }\n });\n if (require.length) {\n c.require = require;\n }\n return c;\n };\n constraints = JSON.parse(JSON.stringify(constraints));\n if (browserDetails.version < 38) {\n logging('spec: ' + JSON.stringify(constraints));\n if (constraints.audio) {\n constraints.audio = constraintsToFF37_(constraints.audio);\n }\n if (constraints.video) {\n constraints.video = constraintsToFF37_(constraints.video);\n }\n logging('ff37: ' + JSON.stringify(constraints));\n }\n return navigator.mozGetUserMedia(constraints, onSuccess, function(e) {\n onError(shimError_(e));\n });\n };\n\n // Returns the result of getUserMedia as a Promise.\n var getUserMediaPromise_ = function(constraints) {\n return new Promise(function(resolve, reject) {\n getUserMedia_(constraints, resolve, reject);\n });\n };\n\n // Shim for mediaDevices on older versions.\n if (!navigator.mediaDevices) {\n navigator.mediaDevices = {getUserMedia: getUserMediaPromise_,\n addEventListener: function() { },\n removeEventListener: function() { }\n };\n }\n navigator.mediaDevices.enumerateDevices =\n navigator.mediaDevices.enumerateDevices || function() {\n return new Promise(function(resolve) {\n var infos = [\n {kind: 'audioinput', deviceId: 'default', label: '', groupId: ''},\n {kind: 'videoinput', deviceId: 'default', label: '', groupId: ''}\n ];\n resolve(infos);\n });\n };\n\n if (browserDetails.version < 41) {\n // Work around http://bugzil.la/1169665\n var orgEnumerateDevices =\n navigator.mediaDevices.enumerateDevices.bind(navigator.mediaDevices);\n navigator.mediaDevices.enumerateDevices = function() {\n return orgEnumerateDevices().then(undefined, function(e) {\n if (e.name === 'NotFoundError') {\n return [];\n }\n throw e;\n });\n };\n }\n if (browserDetails.version < 49) {\n var origGetUserMedia = navigator.mediaDevices.getUserMedia.\n bind(navigator.mediaDevices);\n navigator.mediaDevices.getUserMedia = function(c) {\n return origGetUserMedia(c).then(function(stream) {\n // Work around https://bugzil.la/802326\n if (c.audio && !stream.getAudioTracks().length ||\n c.video && !stream.getVideoTracks().length) {\n stream.getTracks().forEach(function(track) {\n track.stop();\n });\n throw new DOMException('The object can not be found here.',\n 'NotFoundError');\n }\n return stream;\n }, function(e) {\n return Promise.reject(shimError_(e));\n });\n };\n }\n if (!(browserDetails.version > 55 &&\n 'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {\n var 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 var 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 var nativeGetSettings = MediaStreamTrack.prototype.getSettings;\n MediaStreamTrack.prototype.getSettings = function() {\n var 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 var nativeApplyConstraints = 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 navigator.getUserMedia = function(constraints, onSuccess, onError) {\n if (browserDetails.version < 44) {\n return getUserMedia_(constraints, onSuccess, onError);\n }\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\n },{\"../utils\":14}],13:[function(require,module,exports){\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';\n var utils = require('../utils');\n\n module.exports = {\n shimLocalStreamsAPI: function(window) {\n if (typeof window !== 'object' || !window.RTCPeerConnection) {\n return;\n }\n if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {\n window.RTCPeerConnection.prototype.getLocalStreams = function() {\n if (!this._localStreams) {\n this._localStreams = [];\n }\n return this._localStreams;\n };\n }\n if (!('getStreamById' in window.RTCPeerConnection.prototype)) {\n window.RTCPeerConnection.prototype.getStreamById = function(id) {\n var result = null;\n if (this._localStreams) {\n this._localStreams.forEach(function(stream) {\n if (stream.id === id) {\n result = stream;\n }\n });\n }\n if (this._remoteStreams) {\n this._remoteStreams.forEach(function(stream) {\n if (stream.id === id) {\n result = stream;\n }\n });\n }\n return result;\n };\n }\n if (!('addStream' in window.RTCPeerConnection.prototype)) {\n var _addTrack = window.RTCPeerConnection.prototype.addTrack;\n window.RTCPeerConnection.prototype.addStream = function(stream) {\n if (!this._localStreams) {\n this._localStreams = [];\n }\n if (this._localStreams.indexOf(stream) === -1) {\n this._localStreams.push(stream);\n }\n var pc = this;\n stream.getTracks().forEach(function(track) {\n _addTrack.call(pc, track, stream);\n });\n };\n\n window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n if (stream) {\n if (!this._localStreams) {\n this._localStreams = [stream];\n } else if (this._localStreams.indexOf(stream) === -1) {\n this._localStreams.push(stream);\n }\n }\n return _addTrack.call(this, track, stream);\n };\n }\n if (!('removeStream' in window.RTCPeerConnection.prototype)) {\n window.RTCPeerConnection.prototype.removeStream = function(stream) {\n if (!this._localStreams) {\n this._localStreams = [];\n }\n var index = this._localStreams.indexOf(stream);\n if (index === -1) {\n return;\n }\n this._localStreams.splice(index, 1);\n var pc = this;\n var tracks = stream.getTracks();\n this.getSenders().forEach(function(sender) {\n if (tracks.indexOf(sender.track) !== -1) {\n pc.removeTrack(sender);\n }\n });\n };\n }\n },\n shimRemoteStreamsAPI: function(window) {\n if (typeof window !== 'object' || !window.RTCPeerConnection) {\n return;\n }\n if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {\n window.RTCPeerConnection.prototype.getRemoteStreams = function() {\n return this._remoteStreams ? this._remoteStreams : [];\n };\n }\n if (!('onaddstream' in window.RTCPeerConnection.prototype)) {\n Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {\n get: function() {\n return this._onaddstream;\n },\n set: function(f) {\n if (this._onaddstream) {\n this.removeEventListener('addstream', this._onaddstream);\n }\n this.addEventListener('addstream', this._onaddstream = f);\n }\n });\n var origSetRemoteDescription =\n window.RTCPeerConnection.prototype.setRemoteDescription;\n window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n var pc = this;\n if (!this._onaddstreampoly) {\n this.addEventListener('track', this._onaddstreampoly = function(e) {\n e.streams.forEach(function(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 var 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 shimCallbacksAPI: function(window) {\n if (typeof window !== 'object' || !window.RTCPeerConnection) {\n return;\n }\n var prototype = window.RTCPeerConnection.prototype;\n var createOffer = prototype.createOffer;\n var createAnswer = prototype.createAnswer;\n var setLocalDescription = prototype.setLocalDescription;\n var setRemoteDescription = prototype.setRemoteDescription;\n var addIceCandidate = prototype.addIceCandidate;\n\n prototype.createOffer = function(successCallback, failureCallback) {\n var options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n var promise = createOffer.apply(this, [options]);\n if (!failureCallback) {\n return promise;\n }\n promise.then(successCallback, failureCallback);\n return Promise.resolve();\n };\n\n prototype.createAnswer = function(successCallback, failureCallback) {\n var options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n var promise = createAnswer.apply(this, [options]);\n if (!failureCallback) {\n return promise;\n }\n promise.then(successCallback, failureCallback);\n return Promise.resolve();\n };\n\n var withCallback = function(description, successCallback, failureCallback) {\n var 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 var 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 var 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 shimGetUserMedia: function(window) {\n var navigator = window && window.navigator;\n\n if (!navigator.getUserMedia) {\n if (navigator.webkitGetUserMedia) {\n navigator.getUserMedia = navigator.webkitGetUserMedia.bind(navigator);\n } else if (navigator.mediaDevices &&\n navigator.mediaDevices.getUserMedia) {\n navigator.getUserMedia = function(constraints, cb, errcb) {\n navigator.mediaDevices.getUserMedia(constraints)\n .then(cb, errcb);\n }.bind(navigator);\n }\n }\n },\n shimRTCIceServerUrls: function(window) {\n // migrate from non-spec RTCIceServer.url to RTCIceServer.urls\n var OrigPeerConnection = window.RTCPeerConnection;\n window.RTCPeerConnection = function(pcConfig, pcConstraints) {\n if (pcConfig && pcConfig.iceServers) {\n var newIceServers = [];\n for (var i = 0; i < pcConfig.iceServers.length; i++) {\n var 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 window.RTCPeerConnection) {\n Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n get: function() {\n return OrigPeerConnection.generateCertificate;\n }\n });\n }\n },\n shimTrackEventTransceiver: function(window) {\n // Add event.transceiver member over deprecated event.receiver\n if (typeof window === 'object' && window.RTCPeerConnection &&\n ('receiver' in window.RTCTrackEvent.prototype) &&\n // can't check 'transceiver' in window.RTCTrackEvent.prototype, as it is\n // defined for some reason even when window.RTCTransceiver is not.\n !window.RTCTransceiver) {\n Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n get: function() {\n return {receiver: this.receiver};\n }\n });\n }\n },\n\n shimCreateOfferLegacy: function(window) {\n var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n window.RTCPeerConnection.prototype.createOffer = function(offerOptions) {\n var pc = this;\n if (offerOptions) {\n if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {\n // support bit values\n offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;\n }\n var audioTransceiver = pc.getTransceivers().find(function(transceiver) {\n return transceiver.sender.track &&\n transceiver.sender.track.kind === 'audio';\n });\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 pc.addTransceiver('audio');\n }\n\n\n if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {\n // support bit values\n offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;\n }\n var videoTransceiver = pc.getTransceivers().find(function(transceiver) {\n return transceiver.sender.track &&\n transceiver.sender.track.kind === 'video';\n });\n if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {\n if (videoTransceiver.direction === 'sendrecv') {\n videoTransceiver.setDirection('sendonly');\n } else if (videoTransceiver.direction === 'recvonly') {\n videoTransceiver.setDirection('inactive');\n }\n } else if (offerOptions.offerToReceiveVideo === true &&\n !videoTransceiver) {\n pc.addTransceiver('video');\n }\n }\n return origCreateOffer.apply(pc, arguments);\n };\n }\n };\n\n },{\"../utils\":14}],14:[function(require,module,exports){\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\n var logDisabled_ = true;\n var 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 */\n function extractVersion(uastring, expr, pos) {\n var 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).\n function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {\n if (!window.RTCPeerConnection) {\n return;\n }\n var proto = window.RTCPeerConnection.prototype;\n var nativeAddEventListener = proto.addEventListener;\n proto.addEventListener = function(nativeEventName, cb) {\n if (nativeEventName !== eventNameToWrap) {\n return nativeAddEventListener.apply(this, arguments);\n }\n var wrappedCallback = function(e) {\n var modifiedEvent = wrapper(e);\n if (modifiedEvent) {\n cb(modifiedEvent);\n }\n };\n this._eventMap = this._eventMap || {};\n this._eventMap[cb] = wrappedCallback;\n return nativeAddEventListener.apply(this, [nativeEventName,\n wrappedCallback]);\n };\n\n var nativeRemoveEventListener = proto.removeEventListener;\n proto.removeEventListener = function(nativeEventName, cb) {\n if (nativeEventName !== eventNameToWrap || !this._eventMap\n || !this._eventMap[cb]) {\n return nativeRemoveEventListener.apply(this, arguments);\n }\n var unwrappedCb = this._eventMap[cb];\n delete this._eventMap[cb];\n return nativeRemoveEventListener.apply(this, [nativeEventName,\n unwrappedCb]);\n };\n\n Object.defineProperty(proto, 'on' + eventNameToWrap, {\n get: function() {\n return this['_on' + eventNameToWrap];\n },\n set: function(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\n // Utility methods.\n module.exports = {\n extractVersion: extractVersion,\n wrapPeerConnectionEvent: wrapPeerConnectionEvent,\n disableLog: function(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 */\n disableWarnings: function(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\n log: function() {\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 */\n deprecated: function(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 */\n detectBrowser: function(window) {\n var navigator = window && window.navigator;\n\n // Returned result object.\n var result = {};\n result.browser = null;\n result.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 if (navigator.mozGetUserMedia) { // Firefox.\n result.browser = 'firefox';\n result.version = extractVersion(navigator.userAgent,\n /Firefox\\/(\\d+)\\./, 1);\n } else if (navigator.webkitGetUserMedia) {\n // Chrome, Chromium, Webview, Opera.\n // Version matches Chrome/WebRTC version.\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 } else { // Default fallthrough: not supported.\n result.browser = 'Not a supported browser.';\n return result;\n }\n\n return result;\n }\n };\n\n },{}]},{},[3])(3)\n});\n\n"],"file":"adapter.min.js"}