rtcmulticonnection
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RTCMultiConnection is a WebRTC JavaScript wrapper library runs top over RTCPeerConnection API to support all possible peer-to-peer features.
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JavaScript
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1: [function(require, module, exports) {
/*
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree.
*/
/* eslint-env node */
'use strict';
var SDPUtils = require('sdp');
function writeMediaSection(transceiver, caps, type, stream, dtlsRole) {
var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);
// Map ICE parameters (ufrag, pwd) to SDP.
sdp += SDPUtils.writeIceParameters(
transceiver.iceGatherer.getLocalParameters());
// Map DTLS parameters to SDP.
sdp += SDPUtils.writeDtlsParameters(
transceiver.dtlsTransport.getLocalParameters(),
type === 'offer' ? 'actpass' : dtlsRole || 'active');
sdp += 'a=mid:' + transceiver.mid + '\r\n';
if (transceiver.rtpSender && transceiver.rtpReceiver) {
sdp += 'a=sendrecv\r\n';
} else if (transceiver.rtpSender) {
sdp += 'a=sendonly\r\n';
} else if (transceiver.rtpReceiver) {
sdp += 'a=recvonly\r\n';
} else {
sdp += 'a=inactive\r\n';
}
if (transceiver.rtpSender) {
var trackId = transceiver.rtpSender._initialTrackId ||
transceiver.rtpSender.track.id;
transceiver.rtpSender._initialTrackId = trackId;
// spec.
var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +
trackId + '\r\n';
sdp += 'a=' + msid;
// for Chrome. Legacy should no longer be required.
sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
' ' + msid;
// RTX
if (transceiver.sendEncodingParameters[0].rtx) {
sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
' ' + msid;
sdp += 'a=ssrc-group:FID ' +
transceiver.sendEncodingParameters[0].ssrc + ' ' +
transceiver.sendEncodingParameters[0].rtx.ssrc +
'\r\n';
}
}
// FIXME: this should be written by writeRtpDescription.
sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
' cname:' + SDPUtils.localCName + '\r\n';
if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
' cname:' + SDPUtils.localCName + '\r\n';
}
return sdp;
}
// Edge does not like
// 1) stun: filtered after 14393 unless ?transport=udp is present
// 2) turn: that does not have all of turn:host:port?transport=udp
// 3) turn: with ipv6 addresses
// 4) turn: occurring muliple times
function filterIceServers(iceServers, edgeVersion) {
var hasTurn = false;
iceServers = JSON.parse(JSON.stringify(iceServers));
return iceServers.filter(function(server) {
if (server && (server.urls || server.url)) {
var urls = server.urls || server.url;
if (server.url && !server.urls) {
console.warn('RTCIceServer.url is deprecated! Use urls instead.');
}
var isString = typeof urls === 'string';
if (isString) {
urls = [urls];
}
urls = urls.filter(function(url) {
var validTurn = url.indexOf('turn:') === 0 &&
url.indexOf('transport=udp') !== -1 &&
url.indexOf('turn:[') === -1 &&
!hasTurn;
if (validTurn) {
hasTurn = true;
return true;
}
return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&
url.indexOf('?transport=udp') === -1;
});
delete server.url;
server.urls = isString ? urls[0] : urls;
return !!urls.length;
}
});
}
// Determines the intersection of local and remote capabilities.
function getCommonCapabilities(localCapabilities, remoteCapabilities) {
var commonCapabilities = {
codecs: [],
headerExtensions: [],
fecMechanisms: []
};
var findCodecByPayloadType = function(pt, codecs) {
pt = parseInt(pt, 10);
for (var i = 0; i < codecs.length; i++) {
if (codecs[i].payloadType === pt ||
codecs[i].preferredPayloadType === pt) {
return codecs[i];
}
}
};
var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {
var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);
var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);
return lCodec && rCodec &&
lCodec.name.toLowerCase() === rCodec.name.toLowerCase();
};
localCapabilities.codecs.forEach(function(lCodec) {
for (var i = 0; i < remoteCapabilities.codecs.length; i++) {
var rCodec = remoteCapabilities.codecs[i];
if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&
lCodec.clockRate === rCodec.clockRate) {
if (lCodec.name.toLowerCase() === 'rtx' &&
lCodec.parameters && rCodec.parameters.apt) {
// for RTX we need to find the local rtx that has a apt
// which points to the same local codec as the remote one.
if (!rtxCapabilityMatches(lCodec, rCodec,
localCapabilities.codecs, remoteCapabilities.codecs)) {
continue;
}
}
rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy
// number of channels is the highest common number of channels
rCodec.numChannels = Math.min(lCodec.numChannels,
rCodec.numChannels);
// push rCodec so we reply with offerer payload type
commonCapabilities.codecs.push(rCodec);
// determine common feedback mechanisms
rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {
for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {
if (lCodec.rtcpFeedback[j].type === fb.type &&
lCodec.rtcpFeedback[j].parameter === fb.parameter) {
return true;
}
}
return false;
});
// FIXME: also need to determine .parameters
// see https://github.com/openpeer/ortc/issues/569
break;
}
}
});
localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {
for (var i = 0; i < remoteCapabilities.headerExtensions.length; i++) {
var rHeaderExtension = remoteCapabilities.headerExtensions[i];
if (lHeaderExtension.uri === rHeaderExtension.uri) {
commonCapabilities.headerExtensions.push(rHeaderExtension);
break;
}
}
});
// FIXME: fecMechanisms
return commonCapabilities;
}
// is action=setLocalDescription with type allowed in signalingState
function isActionAllowedInSignalingState(action, type, signalingState) {
return {
offer: {
setLocalDescription: ['stable', 'have-local-offer'],
setRemoteDescription: ['stable', 'have-remote-offer']
},
answer: {
setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],
setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']
}
}[type][action].indexOf(signalingState) !== -1;
}
function maybeAddCandidate(iceTransport, candidate) {
// Edge's internal representation adds some fields therefore
// not all fieldѕ are taken into account.
var alreadyAdded = iceTransport.getRemoteCandidates()
.find(function(remoteCandidate) {
return candidate.foundation === remoteCandidate.foundation &&
candidate.ip === remoteCandidate.ip &&
candidate.port === remoteCandidate.port &&
candidate.priority === remoteCandidate.priority &&
candidate.protocol === remoteCandidate.protocol &&
candidate.type === remoteCandidate.type;
});
if (!alreadyAdded) {
iceTransport.addRemoteCandidate(candidate);
}
return !alreadyAdded;
}
function makeError(name, description) {
var e = new Error(description);
e.name = name;
// legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names
e.code = {
NotSupportedError: 9,
InvalidStateError: 11,
InvalidAccessError: 15,
TypeError: undefined,
OperationError: undefined
}[name];
return e;
}
module.exports = function(window, edgeVersion) {
// https://w3c.github.io/mediacapture-main/#mediastream
// Helper function to add the track to the stream and
// dispatch the event ourselves.
function addTrackToStreamAndFireEvent(track, stream) {
stream.addTrack(track);
stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack', {
track: track
}));
}
function removeTrackFromStreamAndFireEvent(track, stream) {
stream.removeTrack(track);
stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack', {
track: track
}));
}
function fireAddTrack(pc, track, receiver, streams) {
var trackEvent = new Event('track');
trackEvent.track = track;
trackEvent.receiver = receiver;
trackEvent.transceiver = {
receiver: receiver
};
trackEvent.streams = streams;
window.setTimeout(function() {
pc._dispatchEvent('track', trackEvent);
});
}
var RTCPeerConnection = function(config) {
var pc = this;
var _eventTarget = document.createDocumentFragment();
['addEventListener', 'removeEventListener', 'dispatchEvent']
.forEach(function(method) {
pc[method] = _eventTarget[method].bind(_eventTarget);
});
this.canTrickleIceCandidates = null;
this.needNegotiation = false;
this.localStreams = [];
this.remoteStreams = [];
this.localDescription = null;
this.remoteDescription = null;
this.signalingState = 'stable';
this.iceConnectionState = 'new';
this.connectionState = 'new';
this.iceGatheringState = 'new';
config = JSON.parse(JSON.stringify(config || {}));
this.usingBundle = config.bundlePolicy === 'max-bundle';
if (config.rtcpMuxPolicy === 'negotiate') {
throw (makeError('NotSupportedError',
'rtcpMuxPolicy \'negotiate\' is not supported'));
} else if (!config.rtcpMuxPolicy) {
config.rtcpMuxPolicy = 'require';
}
switch (config.iceTransportPolicy) {
case 'all':
case 'relay':
break;
default:
config.iceTransportPolicy = 'all';
break;
}
switch (config.bundlePolicy) {
case 'balanced':
case 'max-compat':
case 'max-bundle':
break;
default:
config.bundlePolicy = 'balanced';
break;
}
config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);
this._iceGatherers = [];
if (config.iceCandidatePoolSize) {
for (var i = config.iceCandidatePoolSize; i > 0; i--) {
this._iceGatherers.push(new window.RTCIceGatherer({
iceServers: config.iceServers,
gatherPolicy: config.iceTransportPolicy
}));
}
} else {
config.iceCandidatePoolSize = 0;
}
this._config = config;
// per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...
// everything that is needed to describe a SDP m-line.
this.transceivers = [];
this._sdpSessionId = SDPUtils.generateSessionId();
this._sdpSessionVersion = 0;
this._dtlsRole = undefined; // role for a=setup to use in answers.
this._isClosed = false;
};
// set up event handlers on prototype
RTCPeerConnection.prototype.onicecandidate = null;
RTCPeerConnection.prototype.onaddstream = null;
RTCPeerConnection.prototype.ontrack = null;
RTCPeerConnection.prototype.onremovestream = null;
RTCPeerConnection.prototype.onsignalingstatechange = null;
RTCPeerConnection.prototype.oniceconnectionstatechange = null;
RTCPeerConnection.prototype.onconnectionstatechange = null;
RTCPeerConnection.prototype.onicegatheringstatechange = null;
RTCPeerConnection.prototype.onnegotiationneeded = null;
RTCPeerConnection.prototype.ondatachannel = null;
RTCPeerConnection.prototype._dispatchEvent = function(name, event) {
if (this._isClosed) {
return;
}
this.dispatchEvent(event);
if (typeof this['on' + name] === 'function') {
this['on' + name](event);
}
};
RTCPeerConnection.prototype._emitGatheringStateChange = function() {
var event = new Event('icegatheringstatechange');
this._dispatchEvent('icegatheringstatechange', event);
};
RTCPeerConnection.prototype.getConfiguration = function() {
return this._config;
};
RTCPeerConnection.prototype.getLocalStreams = function() {
return this.localStreams;
};
RTCPeerConnection.prototype.getRemoteStreams = function() {
return this.remoteStreams;
};
// internal helper to create a transceiver object.
// (which is not yet the same as the WebRTC 1.0 transceiver)
RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {
var hasBundleTransport = this.transceivers.length > 0;
var transceiver = {
track: null,
iceGatherer: null,
iceTransport: null,
dtlsTransport: null,
localCapabilities: null,
remoteCapabilities: null,
rtpSender: null,
rtpReceiver: null,
kind: kind,
mid: null,
sendEncodingParameters: null,
recvEncodingParameters: null,
stream: null,
associatedRemoteMediaStreams: [],
wantReceive: true
};
if (this.usingBundle && hasBundleTransport) {
transceiver.iceTransport = this.transceivers[0].iceTransport;
transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;
} else {
var transports = this._createIceAndDtlsTransports();
transceiver.iceTransport = transports.iceTransport;
transceiver.dtlsTransport = transports.dtlsTransport;
}
if (!doNotAdd) {
this.transceivers.push(transceiver);
}
return transceiver;
};
RTCPeerConnection.prototype.addTrack = function(track, stream) {
if (this._isClosed) {
throw makeError('InvalidStateError',
'Attempted to call addTrack on a closed peerconnection.');
}
var alreadyExists = this.transceivers.find(function(s) {
return s.track === track;
});
if (alreadyExists) {
throw makeError('InvalidAccessError', 'Track already exists.');
}
var transceiver;
for (var i = 0; i < this.transceivers.length; i++) {
if (!this.transceivers[i].track &&
this.transceivers[i].kind === track.kind) {
transceiver = this.transceivers[i];
}
}
if (!transceiver) {
transceiver = this._createTransceiver(track.kind);
}
this._maybeFireNegotiationNeeded();
if (this.localStreams.indexOf(stream) === -1) {
this.localStreams.push(stream);
}
transceiver.track = track;
transceiver.stream = stream;
transceiver.rtpSender = new window.RTCRtpSender(track,
transceiver.dtlsTransport);
return transceiver.rtpSender;
};
RTCPeerConnection.prototype.addStream = function(stream) {
var pc = this;
if (edgeVersion >= 15025) {
stream.getTracks().forEach(function(track) {
pc.addTrack(track, stream);
});
} else {
// Clone is necessary for local demos mostly, attaching directly
// to two different senders does not work (build 10547).
// Fixed in 15025 (or earlier)
var clonedStream = stream.clone();
stream.getTracks().forEach(function(track, idx) {
var clonedTrack = clonedStream.getTracks()[idx];
track.addEventListener('enabled', function(event) {
clonedTrack.enabled = event.enabled;
});
});
clonedStream.getTracks().forEach(function(track) {
pc.addTrack(track, clonedStream);
});
}
};
RTCPeerConnection.prototype.removeTrack = function(sender) {
if (this._isClosed) {
throw makeError('InvalidStateError',
'Attempted to call removeTrack on a closed peerconnection.');
}
if (!(sender instanceof window.RTCRtpSender)) {
throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +
'does not implement interface RTCRtpSender.');
}
var transceiver = this.transceivers.find(function(t) {
return t.rtpSender === sender;
});
if (!transceiver) {
throw makeError('InvalidAccessError',
'Sender was not created by this connection.');
}
var stream = transceiver.stream;
transceiver.rtpSender.stop();
transceiver.rtpSender = null;
transceiver.track = null;
transceiver.stream = null;
// remove the stream from the set of local streams
var localStreams = this.transceivers.map(function(t) {
return t.stream;
});
if (localStreams.indexOf(stream) === -1 &&
this.localStreams.indexOf(stream) > -1) {
this.localStreams.splice(this.localStreams.indexOf(stream), 1);
}
this._maybeFireNegotiationNeeded();
};
RTCPeerConnection.prototype.removeStream = function(stream) {
var pc = this;
stream.getTracks().forEach(function(track) {
var sender = pc.getSenders().find(function(s) {
return s.track === track;
});
if (sender) {
pc.removeTrack(sender);
}
});
};
RTCPeerConnection.prototype.getSenders = function() {
return this.transceivers.filter(function(transceiver) {
return !!transceiver.rtpSender;
})
.map(function(transceiver) {
return transceiver.rtpSender;
});
};
RTCPeerConnection.prototype.getReceivers = function() {
return this.transceivers.filter(function(transceiver) {
return !!transceiver.rtpReceiver;
})
.map(function(transceiver) {
return transceiver.rtpReceiver;
});
};
RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,
usingBundle) {
var pc = this;
if (usingBundle && sdpMLineIndex > 0) {
return this.transceivers[0].iceGatherer;
} else if (this._iceGatherers.length) {
return this._iceGatherers.shift();
}
var iceGatherer = new window.RTCIceGatherer({
iceServers: this._config.iceServers,
gatherPolicy: this._config.iceTransportPolicy
});
Object.defineProperty(iceGatherer, 'state', {
value: 'new',
writable: true
});
this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];
this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {
var end = !event.candidate || Object.keys(event.candidate).length === 0;
// polyfill since RTCIceGatherer.state is not implemented in
// Edge 10547 yet.
iceGatherer.state = end ? 'completed' : 'gathering';
if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {
pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);
}
};
iceGatherer.addEventListener('localcandidate',
this.transceivers[sdpMLineIndex].bufferCandidates);
return iceGatherer;
};
// start gathering from an RTCIceGatherer.
RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {
var pc = this;
var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
if (iceGatherer.onlocalcandidate) {
return;
}
var bufferedCandidateEvents =
this.transceivers[sdpMLineIndex].bufferedCandidateEvents;
this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;
iceGatherer.removeEventListener('localcandidate',
this.transceivers[sdpMLineIndex].bufferCandidates);
iceGatherer.onlocalcandidate = function(evt) {
if (pc.usingBundle && sdpMLineIndex > 0) {
// if we know that we use bundle we can drop candidates with
// ѕdpMLineIndex > 0. If we don't do this then our state gets
// confused since we dispose the extra ice gatherer.
return;
}
var event = new Event('icecandidate');
event.candidate = {
sdpMid: mid,
sdpMLineIndex: sdpMLineIndex
};
var cand = evt.candidate;
// Edge emits an empty object for RTCIceCandidateComplete‥
var end = !cand || Object.keys(cand).length === 0;
if (end) {
// polyfill since RTCIceGatherer.state is not implemented in
// Edge 10547 yet.
if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {
iceGatherer.state = 'completed';
}
} else {
if (iceGatherer.state === 'new') {
iceGatherer.state = 'gathering';
}
// RTCIceCandidate doesn't have a component, needs to be added
cand.component = 1;
// also the usernameFragment. TODO: update SDP to take both variants.
cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;
var serializedCandidate = SDPUtils.writeCandidate(cand);
event.candidate = Object.assign(event.candidate,
SDPUtils.parseCandidate(serializedCandidate));
event.candidate.candidate = serializedCandidate;
event.candidate.toJSON = function() {
return {
candidate: event.candidate.candidate,
sdpMid: event.candidate.sdpMid,
sdpMLineIndex: event.candidate.sdpMLineIndex,
usernameFragment: event.candidate.usernameFragment
};
};
}
// update local description.
var sections = SDPUtils.getMediaSections(pc.localDescription.sdp);
if (!end) {
sections[event.candidate.sdpMLineIndex] +=
'a=' + event.candidate.candidate + '\r\n';
} else {
sections[event.candidate.sdpMLineIndex] +=
'a=end-of-candidates\r\n';
}
pc.localDescription.sdp =
SDPUtils.getDescription(pc.localDescription.sdp) +
sections.join('');
var complete = pc.transceivers.every(function(transceiver) {
return transceiver.iceGatherer &&
transceiver.iceGatherer.state === 'completed';
});
if (pc.iceGatheringState !== 'gathering') {
pc.iceGatheringState = 'gathering';
pc._emitGatheringStateChange();
}
// Emit candidate. Also emit null candidate when all gatherers are
// complete.
if (!end) {
pc._dispatchEvent('icecandidate', event);
}
if (complete) {
pc._dispatchEvent('icecandidate', new Event('icecandidate'));
pc.iceGatheringState = 'complete';
pc._emitGatheringStateChange();
}
};
// emit already gathered candidates.
window.setTimeout(function() {
bufferedCandidateEvents.forEach(function(e) {
iceGatherer.onlocalcandidate(e);
});
}, 0);
};
// Create ICE transport and DTLS transport.
RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {
var pc = this;
var iceTransport = new window.RTCIceTransport(null);
iceTransport.onicestatechange = function() {
pc._updateIceConnectionState();
pc._updateConnectionState();
};
var dtlsTransport = new window.RTCDtlsTransport(iceTransport);
dtlsTransport.ondtlsstatechange = function() {
pc._updateConnectionState();
};
dtlsTransport.onerror = function() {
// onerror does not set state to failed by itself.
Object.defineProperty(dtlsTransport, 'state', {
value: 'failed',
writable: true
});
pc._updateConnectionState();
};
return {
iceTransport: iceTransport,
dtlsTransport: dtlsTransport
};
};
// Destroy ICE gatherer, ICE transport and DTLS transport.
// Without triggering the callbacks.
RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(
sdpMLineIndex) {
var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
if (iceGatherer) {
delete iceGatherer.onlocalcandidate;
delete this.transceivers[sdpMLineIndex].iceGatherer;
}
var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;
if (iceTransport) {
delete iceTransport.onicestatechange;
delete this.transceivers[sdpMLineIndex].iceTransport;
}
var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;
if (dtlsTransport) {
delete dtlsTransport.ondtlsstatechange;
delete dtlsTransport.onerror;
delete this.transceivers[sdpMLineIndex].dtlsTransport;
}
};
// Start the RTP Sender and Receiver for a transceiver.
RTCPeerConnection.prototype._transceive = function(transceiver,
send, recv) {
var params = getCommonCapabilities(transceiver.localCapabilities,
transceiver.remoteCapabilities);
if (send && transceiver.rtpSender) {
params.encodings = transceiver.sendEncodingParameters;
params.rtcp = {
cname: SDPUtils.localCName,
compound: transceiver.rtcpParameters.compound
};
if (transceiver.recvEncodingParameters.length) {
params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;
}
transceiver.rtpSender.send(params);
}
if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {
// remove RTX field in Edge 14942
if (transceiver.kind === 'video' &&
transceiver.recvEncodingParameters &&
edgeVersion < 15019) {
transceiver.recvEncodingParameters.forEach(function(p) {
delete p.rtx;
});
}
if (transceiver.recvEncodingParameters.length) {
params.encodings = transceiver.recvEncodingParameters;
} else {
params.encodings = [{}];
}
params.rtcp = {
compound: transceiver.rtcpParameters.compound
};
if (transceiver.rtcpParameters.cname) {
params.rtcp.cname = transceiver.rtcpParameters.cname;
}
if (transceiver.sendEncodingParameters.length) {
params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;
}
transceiver.rtpReceiver.receive(params);
}
};
RTCPeerConnection.prototype.setLocalDescription = function(description) {
var pc = this;
// Note: pranswer is not supported.
if (['offer', 'answer'].indexOf(description.type) === -1) {
return Promise.reject(makeError('TypeError',
'Unsupported type "' + description.type + '"'));
}
if (!isActionAllowedInSignalingState('setLocalDescription',
description.type, pc.signalingState) || pc._isClosed) {
return Promise.reject(makeError('InvalidStateError',
'Can not set local ' + description.type +
' in state ' + pc.signalingState));
}
var sections;
var sessionpart;
if (description.type === 'offer') {
// VERY limited support for SDP munging. Limited to:
// * changing the order of codecs
sections = SDPUtils.splitSections(description.sdp);
sessionpart = sections.shift();
sections.forEach(function(mediaSection, sdpMLineIndex) {
var caps = SDPUtils.parseRtpParameters(mediaSection);
pc.transceivers[sdpMLineIndex].localCapabilities = caps;
});
pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
pc._gather(transceiver.mid, sdpMLineIndex);
});
} else if (description.type === 'answer') {
sections = SDPUtils.splitSections(pc.remoteDescription.sdp);
sessionpart = sections.shift();
var isIceLite = SDPUtils.matchPrefix(sessionpart,
'a=ice-lite').length > 0;
sections.forEach(function(mediaSection, sdpMLineIndex) {
var transceiver = pc.transceivers[sdpMLineIndex];
var iceGatherer = transceiver.iceGatherer;
var iceTransport = transceiver.iceTransport;
var dtlsTransport = transceiver.dtlsTransport;
var localCapabilities = transceiver.localCapabilities;
var remoteCapabilities = transceiver.remoteCapabilities;
// treat bundle-only as not-rejected.
var rejected = SDPUtils.isRejected(mediaSection) &&
SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
if (!rejected && !transceiver.rejected) {
var remoteIceParameters = SDPUtils.getIceParameters(
mediaSection, sessionpart);
var remoteDtlsParameters = SDPUtils.getDtlsParameters(
mediaSection, sessionpart);
if (isIceLite) {
remoteDtlsParameters.role = 'server';
}
if (!pc.usingBundle || sdpMLineIndex === 0) {
pc._gather(transceiver.mid, sdpMLineIndex);
if (iceTransport.state === 'new') {
iceTransport.start(iceGatherer, remoteIceParameters,
isIceLite ? 'controlling' : 'controlled');
}
if (dtlsTransport.state === 'new') {
dtlsTransport.start(remoteDtlsParameters);
}
}
// Calculate intersection of capabilities.
var params = getCommonCapabilities(localCapabilities,
remoteCapabilities);
// Start the RTCRtpSender. The RTCRtpReceiver for this
// transceiver has already been started in setRemoteDescription.
pc._transceive(transceiver,
params.codecs.length > 0,
false);
}
});
}
pc.localDescription = {
type: description.type,
sdp: description.sdp
};
if (description.type === 'offer') {
pc._updateSignalingState('have-local-offer');
} else {
pc._updateSignalingState('stable');
}
return Promise.resolve();
};
RTCPeerConnection.prototype.setRemoteDescription = function(description) {
var pc = this;
// Note: pranswer is not supported.
if (['offer', 'answer'].indexOf(description.type) === -1) {
return Promise.reject(makeError('TypeError',
'Unsupported type "' + description.type + '"'));
}
if (!isActionAllowedInSignalingState('setRemoteDescription',
description.type, pc.signalingState) || pc._isClosed) {
return Promise.reject(makeError('InvalidStateError',
'Can not set remote ' + description.type +
' in state ' + pc.signalingState));
}
var streams = {};
pc.remoteStreams.forEach(function(stream) {
streams[stream.id] = stream;
});
var receiverList = [];
var sections = SDPUtils.splitSections(description.sdp);
var sessionpart = sections.shift();
var isIceLite = SDPUtils.matchPrefix(sessionpart,
'a=ice-lite').length > 0;
var usingBundle = SDPUtils.matchPrefix(sessionpart,
'a=group:BUNDLE ').length > 0;
pc.usingBundle = usingBundle;
var iceOptions = SDPUtils.matchPrefix(sessionpart,
'a=ice-options:')[0];
if (iceOptions) {
pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')
.indexOf('trickle') >= 0;
} else {
pc.canTrickleIceCandidates = false;
}
sections.forEach(function(mediaSection, sdpMLineIndex) {
var lines = SDPUtils.splitLines(mediaSection);
var kind = SDPUtils.getKind(mediaSection);
// treat bundle-only as not-rejected.
var rejected = SDPUtils.isRejected(mediaSection) &&
SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
var protocol = lines[0].substr(2).split(' ')[2];
var direction = SDPUtils.getDirection(mediaSection, sessionpart);
var remoteMsid = SDPUtils.parseMsid(mediaSection);
var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();
// Reject datachannels which are not implemented yet.
if ((kind === 'application' && protocol === 'DTLS/SCTP') || rejected) {
// TODO: this is dangerous in the case where a non-rejected m-line
// becomes rejected.
pc.transceivers[sdpMLineIndex] = {
mid: mid,
kind: kind,
rejected: true
};
return;
}
if (!rejected && pc.transceivers[sdpMLineIndex] &&
pc.transceivers[sdpMLineIndex].rejected) {
// recycle a rejected transceiver.
pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);
}
var transceiver;
var iceGatherer;
var iceTransport;
var dtlsTransport;
var rtpReceiver;
var sendEncodingParameters;
var recvEncodingParameters;
var localCapabilities;
var track;
// FIXME: ensure the mediaSection has rtcp-mux set.
var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
var remoteIceParameters;
var remoteDtlsParameters;
if (!rejected) {
remoteIceParameters = SDPUtils.getIceParameters(mediaSection,
sessionpart);
remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,
sessionpart);
remoteDtlsParameters.role = 'client';
}
recvEncodingParameters =
SDPUtils.parseRtpEncodingParameters(mediaSection);
var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);
var isComplete = SDPUtils.matchPrefix(mediaSection,
'a=end-of-candidates', sessionpart).length > 0;
var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')
.map(functio