1858 lines
63 KiB
JavaScript
1858 lines
63 KiB
JavaScript
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree.
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*/
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/* eslint-env node */
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'use strict';
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var SDPUtils = require('sdp');
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function fixStatsType(stat) {
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return {
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inboundrtp: 'inbound-rtp',
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outboundrtp: 'outbound-rtp',
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candidatepair: 'candidate-pair',
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localcandidate: 'local-candidate',
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remotecandidate: 'remote-candidate'
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}[stat.type] || stat.type;
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}
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function writeMediaSection(transceiver, caps, type, stream, dtlsRole) {
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var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);
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// Map ICE parameters (ufrag, pwd) to SDP.
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sdp += SDPUtils.writeIceParameters(
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transceiver.iceGatherer.getLocalParameters());
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// Map DTLS parameters to SDP.
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sdp += SDPUtils.writeDtlsParameters(
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transceiver.dtlsTransport.getLocalParameters(),
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type === 'offer' ? 'actpass' : dtlsRole || 'active');
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sdp += 'a=mid:' + transceiver.mid + '\r\n';
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if (transceiver.rtpSender && transceiver.rtpReceiver) {
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sdp += 'a=sendrecv\r\n';
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} else if (transceiver.rtpSender) {
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sdp += 'a=sendonly\r\n';
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} else if (transceiver.rtpReceiver) {
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sdp += 'a=recvonly\r\n';
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} else {
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sdp += 'a=inactive\r\n';
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}
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if (transceiver.rtpSender) {
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var trackId = transceiver.rtpSender._initialTrackId ||
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transceiver.rtpSender.track.id;
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transceiver.rtpSender._initialTrackId = trackId;
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// spec.
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var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +
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trackId + '\r\n';
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sdp += 'a=' + msid;
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// for Chrome. Legacy should no longer be required.
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sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
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' ' + msid;
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// RTX
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if (transceiver.sendEncodingParameters[0].rtx) {
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sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
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' ' + msid;
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sdp += 'a=ssrc-group:FID ' +
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transceiver.sendEncodingParameters[0].ssrc + ' ' +
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transceiver.sendEncodingParameters[0].rtx.ssrc +
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'\r\n';
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}
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}
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// FIXME: this should be written by writeRtpDescription.
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sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
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' cname:' + SDPUtils.localCName + '\r\n';
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if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
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sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
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' cname:' + SDPUtils.localCName + '\r\n';
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}
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return sdp;
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}
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// Edge does not like
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// 1) stun: filtered after 14393 unless ?transport=udp is present
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// 2) turn: that does not have all of turn:host:port?transport=udp
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// 3) turn: with ipv6 addresses
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// 4) turn: occurring muliple times
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function filterIceServers(iceServers, edgeVersion) {
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var hasTurn = false;
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iceServers = JSON.parse(JSON.stringify(iceServers));
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return iceServers.filter(function(server) {
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if (server && (server.urls || server.url)) {
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var urls = server.urls || server.url;
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if (server.url && !server.urls) {
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console.warn('RTCIceServer.url is deprecated! Use urls instead.');
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}
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var isString = typeof urls === 'string';
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if (isString) {
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urls = [urls];
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}
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urls = urls.filter(function(url) {
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var validTurn = url.indexOf('turn:') === 0 &&
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url.indexOf('transport=udp') !== -1 &&
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url.indexOf('turn:[') === -1 &&
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!hasTurn;
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if (validTurn) {
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hasTurn = true;
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return true;
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}
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return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&
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url.indexOf('?transport=udp') === -1;
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});
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delete server.url;
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server.urls = isString ? urls[0] : urls;
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return !!urls.length;
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}
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});
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}
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// Determines the intersection of local and remote capabilities.
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function getCommonCapabilities(localCapabilities, remoteCapabilities) {
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var commonCapabilities = {
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codecs: [],
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headerExtensions: [],
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fecMechanisms: []
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};
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var findCodecByPayloadType = function(pt, codecs) {
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pt = parseInt(pt, 10);
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for (var i = 0; i < codecs.length; i++) {
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if (codecs[i].payloadType === pt ||
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codecs[i].preferredPayloadType === pt) {
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return codecs[i];
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}
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}
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};
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var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {
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var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);
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var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);
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return lCodec && rCodec &&
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lCodec.name.toLowerCase() === rCodec.name.toLowerCase();
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};
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localCapabilities.codecs.forEach(function(lCodec) {
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for (var i = 0; i < remoteCapabilities.codecs.length; i++) {
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var rCodec = remoteCapabilities.codecs[i];
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if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&
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lCodec.clockRate === rCodec.clockRate) {
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if (lCodec.name.toLowerCase() === 'rtx' &&
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lCodec.parameters && rCodec.parameters.apt) {
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// for RTX we need to find the local rtx that has a apt
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// which points to the same local codec as the remote one.
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if (!rtxCapabilityMatches(lCodec, rCodec,
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localCapabilities.codecs, remoteCapabilities.codecs)) {
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continue;
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}
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}
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rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy
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// number of channels is the highest common number of channels
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rCodec.numChannels = Math.min(lCodec.numChannels,
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rCodec.numChannels);
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// push rCodec so we reply with offerer payload type
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commonCapabilities.codecs.push(rCodec);
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// determine common feedback mechanisms
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rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {
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for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {
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if (lCodec.rtcpFeedback[j].type === fb.type &&
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lCodec.rtcpFeedback[j].parameter === fb.parameter) {
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return true;
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}
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}
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return false;
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});
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// FIXME: also need to determine .parameters
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// see https://github.com/openpeer/ortc/issues/569
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break;
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}
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}
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});
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localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {
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for (var i = 0; i < remoteCapabilities.headerExtensions.length;
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i++) {
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var rHeaderExtension = remoteCapabilities.headerExtensions[i];
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if (lHeaderExtension.uri === rHeaderExtension.uri) {
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commonCapabilities.headerExtensions.push(rHeaderExtension);
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break;
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}
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}
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});
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// FIXME: fecMechanisms
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return commonCapabilities;
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}
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// is action=setLocalDescription with type allowed in signalingState
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function isActionAllowedInSignalingState(action, type, signalingState) {
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return {
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offer: {
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setLocalDescription: ['stable', 'have-local-offer'],
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setRemoteDescription: ['stable', 'have-remote-offer']
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},
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answer: {
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setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],
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setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']
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}
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}[type][action].indexOf(signalingState) !== -1;
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}
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function maybeAddCandidate(iceTransport, candidate) {
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// Edge's internal representation adds some fields therefore
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// not all fieldѕ are taken into account.
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var alreadyAdded = iceTransport.getRemoteCandidates()
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.find(function(remoteCandidate) {
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return candidate.foundation === remoteCandidate.foundation &&
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candidate.ip === remoteCandidate.ip &&
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candidate.port === remoteCandidate.port &&
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candidate.priority === remoteCandidate.priority &&
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candidate.protocol === remoteCandidate.protocol &&
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candidate.type === remoteCandidate.type;
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});
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if (!alreadyAdded) {
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iceTransport.addRemoteCandidate(candidate);
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}
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return !alreadyAdded;
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}
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function makeError(name, description) {
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var e = new Error(description);
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e.name = name;
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// legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names
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e.code = {
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NotSupportedError: 9,
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InvalidStateError: 11,
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InvalidAccessError: 15,
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TypeError: undefined,
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OperationError: undefined
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}[name];
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return e;
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}
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module.exports = function(window, edgeVersion) {
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// https://w3c.github.io/mediacapture-main/#mediastream
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// Helper function to add the track to the stream and
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// dispatch the event ourselves.
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function addTrackToStreamAndFireEvent(track, stream) {
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stream.addTrack(track);
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stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',
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{track: track}));
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}
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function removeTrackFromStreamAndFireEvent(track, stream) {
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stream.removeTrack(track);
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stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',
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{track: track}));
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}
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function fireAddTrack(pc, track, receiver, streams) {
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var trackEvent = new Event('track');
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trackEvent.track = track;
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trackEvent.receiver = receiver;
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trackEvent.transceiver = {receiver: receiver};
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trackEvent.streams = streams;
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window.setTimeout(function() {
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pc._dispatchEvent('track', trackEvent);
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});
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}
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var RTCPeerConnection = function(config) {
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var pc = this;
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var _eventTarget = document.createDocumentFragment();
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['addEventListener', 'removeEventListener', 'dispatchEvent']
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.forEach(function(method) {
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pc[method] = _eventTarget[method].bind(_eventTarget);
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});
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this.canTrickleIceCandidates = null;
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this.needNegotiation = false;
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this.localStreams = [];
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this.remoteStreams = [];
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this._localDescription = null;
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this._remoteDescription = null;
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this.signalingState = 'stable';
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this.iceConnectionState = 'new';
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this.connectionState = 'new';
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this.iceGatheringState = 'new';
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config = JSON.parse(JSON.stringify(config || {}));
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this.usingBundle = config.bundlePolicy === 'max-bundle';
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if (config.rtcpMuxPolicy === 'negotiate') {
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throw(makeError('NotSupportedError',
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'rtcpMuxPolicy \'negotiate\' is not supported'));
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} else if (!config.rtcpMuxPolicy) {
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config.rtcpMuxPolicy = 'require';
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}
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switch (config.iceTransportPolicy) {
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case 'all':
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case 'relay':
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break;
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default:
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config.iceTransportPolicy = 'all';
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break;
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}
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switch (config.bundlePolicy) {
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case 'balanced':
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case 'max-compat':
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case 'max-bundle':
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break;
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default:
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config.bundlePolicy = 'balanced';
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break;
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}
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config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);
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this._iceGatherers = [];
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if (config.iceCandidatePoolSize) {
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for (var i = config.iceCandidatePoolSize; i > 0; i--) {
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this._iceGatherers.push(new window.RTCIceGatherer({
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iceServers: config.iceServers,
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gatherPolicy: config.iceTransportPolicy
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}));
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}
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} else {
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config.iceCandidatePoolSize = 0;
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}
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this._config = config;
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// per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...
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// everything that is needed to describe a SDP m-line.
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this.transceivers = [];
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this._sdpSessionId = SDPUtils.generateSessionId();
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this._sdpSessionVersion = 0;
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this._dtlsRole = undefined; // role for a=setup to use in answers.
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this._isClosed = false;
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};
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Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {
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configurable: true,
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get: function() {
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return this._localDescription;
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}
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});
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Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {
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configurable: true,
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get: function() {
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return this._remoteDescription;
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}
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});
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// set up event handlers on prototype
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RTCPeerConnection.prototype.onicecandidate = null;
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RTCPeerConnection.prototype.onaddstream = null;
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RTCPeerConnection.prototype.ontrack = null;
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RTCPeerConnection.prototype.onremovestream = null;
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RTCPeerConnection.prototype.onsignalingstatechange = null;
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||
RTCPeerConnection.prototype.oniceconnectionstatechange = null;
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RTCPeerConnection.prototype.onconnectionstatechange = null;
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RTCPeerConnection.prototype.onicegatheringstatechange = null;
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RTCPeerConnection.prototype.onnegotiationneeded = null;
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RTCPeerConnection.prototype.ondatachannel = null;
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RTCPeerConnection.prototype._dispatchEvent = function(name, event) {
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if (this._isClosed) {
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return;
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}
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this.dispatchEvent(event);
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if (typeof this['on' + name] === 'function') {
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this['on' + name](event);
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}
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};
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RTCPeerConnection.prototype._emitGatheringStateChange = function() {
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var event = new Event('icegatheringstatechange');
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this._dispatchEvent('icegatheringstatechange', event);
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};
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RTCPeerConnection.prototype.getConfiguration = function() {
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return this._config;
|
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};
|
||
|
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RTCPeerConnection.prototype.getLocalStreams = function() {
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return this.localStreams;
|
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};
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||
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||
RTCPeerConnection.prototype.getRemoteStreams = function() {
|
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return this.remoteStreams;
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};
|
||
|
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// internal helper to create a transceiver object.
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// (which is not yet the same as the WebRTC 1.0 transceiver)
|
||
RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {
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var hasBundleTransport = this.transceivers.length > 0;
|
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var transceiver = {
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track: null,
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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 (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||
|
||
protocol === 'UDP/DTLS/SCTP'))) {
|
||
// TODO: this is dangerous in the case where a non-rejected m-line
|
||
// becomes rejected.
|
||
pc.transceivers[sdpMLineIndex] = {
|
||
mid: mid,
|
||
kind: kind,
|
||
protocol: protocol,
|
||
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(function(cand) {
|
||
return SDPUtils.parseCandidate(cand);
|
||
})
|
||
.filter(function(cand) {
|
||
return cand.component === 1;
|
||
});
|
||
|
||
// Check if we can use BUNDLE and dispose transports.
|
||
if ((description.type === 'offer' || description.type === 'answer') &&
|
||
!rejected && usingBundle && sdpMLineIndex > 0 &&
|
||
pc.transceivers[sdpMLineIndex]) {
|
||
pc._disposeIceAndDtlsTransports(sdpMLineIndex);
|
||
pc.transceivers[sdpMLineIndex].iceGatherer =
|
||
pc.transceivers[0].iceGatherer;
|
||
pc.transceivers[sdpMLineIndex].iceTransport =
|
||
pc.transceivers[0].iceTransport;
|
||
pc.transceivers[sdpMLineIndex].dtlsTransport =
|
||
pc.transceivers[0].dtlsTransport;
|
||
if (pc.transceivers[sdpMLineIndex].rtpSender) {
|
||
pc.transceivers[sdpMLineIndex].rtpSender.setTransport(
|
||
pc.transceivers[0].dtlsTransport);
|
||
}
|
||
if (pc.transceivers[sdpMLineIndex].rtpReceiver) {
|
||
pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(
|
||
pc.transceivers[0].dtlsTransport);
|
||
}
|
||
}
|
||
if (description.type === 'offer' && !rejected) {
|
||
transceiver = pc.transceivers[sdpMLineIndex] ||
|
||
pc._createTransceiver(kind);
|
||
transceiver.mid = mid;
|
||
|
||
if (!transceiver.iceGatherer) {
|
||
transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,
|
||
usingBundle);
|
||
}
|
||
|
||
if (cands.length && transceiver.iceTransport.state === 'new') {
|
||
if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {
|
||
transceiver.iceTransport.setRemoteCandidates(cands);
|
||
} else {
|
||
cands.forEach(function(candidate) {
|
||
maybeAddCandidate(transceiver.iceTransport, candidate);
|
||
});
|
||
}
|
||
}
|
||
|
||
localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);
|
||
|
||
// filter RTX until additional stuff needed for RTX is implemented
|
||
// in adapter.js
|
||
if (edgeVersion < 15019) {
|
||
localCapabilities.codecs = localCapabilities.codecs.filter(
|
||
function(codec) {
|
||
return codec.name !== 'rtx';
|
||
});
|
||
}
|
||
|
||
sendEncodingParameters = transceiver.sendEncodingParameters || [{
|
||
ssrc: (2 * sdpMLineIndex + 2) * 1001
|
||
}];
|
||
|
||
// TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
|
||
var isNewTrack = false;
|
||
if (direction === 'sendrecv' || direction === 'sendonly') {
|
||
isNewTrack = !transceiver.rtpReceiver;
|
||
rtpReceiver = transceiver.rtpReceiver ||
|
||
new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);
|
||
|
||
if (isNewTrack) {
|
||
var stream;
|
||
track = rtpReceiver.track;
|
||
// FIXME: does not work with Plan B.
|
||
if (remoteMsid && remoteMsid.stream === '-') {
|
||
// no-op. a stream id of '-' means: no associated stream.
|
||
} else if (remoteMsid) {
|
||
if (!streams[remoteMsid.stream]) {
|
||
streams[remoteMsid.stream] = new window.MediaStream();
|
||
Object.defineProperty(streams[remoteMsid.stream], 'id', {
|
||
get: function() {
|
||
return remoteMsid.stream;
|
||
}
|
||
});
|
||
}
|
||
Object.defineProperty(track, 'id', {
|
||
get: function() {
|
||
return remoteMsid.track;
|
||
}
|
||
});
|
||
stream = streams[remoteMsid.stream];
|
||
} else {
|
||
if (!streams.default) {
|
||
streams.default = new window.MediaStream();
|
||
}
|
||
stream = streams.default;
|
||
}
|
||
if (stream) {
|
||
addTrackToStreamAndFireEvent(track, stream);
|
||
transceiver.associatedRemoteMediaStreams.push(stream);
|
||
}
|
||
receiverList.push([track, rtpReceiver, stream]);
|
||
}
|
||
} else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {
|
||
transceiver.associatedRemoteMediaStreams.forEach(function(s) {
|
||
var nativeTrack = s.getTracks().find(function(t) {
|
||
return t.id === transceiver.rtpReceiver.track.id;
|
||
});
|
||
if (nativeTrack) {
|
||
removeTrackFromStreamAndFireEvent(nativeTrack, s);
|
||
}
|
||
});
|
||
transceiver.associatedRemoteMediaStreams = [];
|
||
}
|
||
|
||
transceiver.localCapabilities = localCapabilities;
|
||
transceiver.remoteCapabilities = remoteCapabilities;
|
||
transceiver.rtpReceiver = rtpReceiver;
|
||
transceiver.rtcpParameters = rtcpParameters;
|
||
transceiver.sendEncodingParameters = sendEncodingParameters;
|
||
transceiver.recvEncodingParameters = recvEncodingParameters;
|
||
|
||
// Start the RTCRtpReceiver now. The RTPSender is started in
|
||
// setLocalDescription.
|
||
pc._transceive(pc.transceivers[sdpMLineIndex],
|
||
false,
|
||
isNewTrack);
|
||
} else if (description.type === 'answer' && !rejected) {
|
||
transceiver = pc.transceivers[sdpMLineIndex];
|
||
iceGatherer = transceiver.iceGatherer;
|
||
iceTransport = transceiver.iceTransport;
|
||
dtlsTransport = transceiver.dtlsTransport;
|
||
rtpReceiver = transceiver.rtpReceiver;
|
||
sendEncodingParameters = transceiver.sendEncodingParameters;
|
||
localCapabilities = transceiver.localCapabilities;
|
||
|
||
pc.transceivers[sdpMLineIndex].recvEncodingParameters =
|
||
recvEncodingParameters;
|
||
pc.transceivers[sdpMLineIndex].remoteCapabilities =
|
||
remoteCapabilities;
|
||
pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;
|
||
|
||
if (cands.length && iceTransport.state === 'new') {
|
||
if ((isIceLite || isComplete) &&
|
||
(!usingBundle || sdpMLineIndex === 0)) {
|
||
iceTransport.setRemoteCandidates(cands);
|
||
} else {
|
||
cands.forEach(function(candidate) {
|
||
maybeAddCandidate(transceiver.iceTransport, candidate);
|
||
});
|
||
}
|
||
}
|
||
|
||
if (!usingBundle || sdpMLineIndex === 0) {
|
||
if (iceTransport.state === 'new') {
|
||
iceTransport.start(iceGatherer, remoteIceParameters,
|
||
'controlling');
|
||
}
|
||
if (dtlsTransport.state === 'new') {
|
||
dtlsTransport.start(remoteDtlsParameters);
|
||
}
|
||
}
|
||
|
||
// If the offer contained RTX but the answer did not,
|
||
// remove RTX from sendEncodingParameters.
|
||
var commonCapabilities = getCommonCapabilities(
|
||
transceiver.localCapabilities,
|
||
transceiver.remoteCapabilities);
|
||
|
||
var hasRtx = commonCapabilities.codecs.filter(function(c) {
|
||
return c.name.toLowerCase() === 'rtx';
|
||
}).length;
|
||
if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
|
||
delete transceiver.sendEncodingParameters[0].rtx;
|
||
}
|
||
|
||
pc._transceive(transceiver,
|
||
direction === 'sendrecv' || direction === 'recvonly',
|
||
direction === 'sendrecv' || direction === 'sendonly');
|
||
|
||
// TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
|
||
if (rtpReceiver &&
|
||
(direction === 'sendrecv' || direction === 'sendonly')) {
|
||
track = rtpReceiver.track;
|
||
if (remoteMsid) {
|
||
if (!streams[remoteMsid.stream]) {
|
||
streams[remoteMsid.stream] = new window.MediaStream();
|
||
}
|
||
addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);
|
||
receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);
|
||
} else {
|
||
if (!streams.default) {
|
||
streams.default = new window.MediaStream();
|
||
}
|
||
addTrackToStreamAndFireEvent(track, streams.default);
|
||
receiverList.push([track, rtpReceiver, streams.default]);
|
||
}
|
||
} else {
|
||
// FIXME: actually the receiver should be created later.
|
||
delete transceiver.rtpReceiver;
|
||
}
|
||
}
|
||
});
|
||
|
||
if (pc._dtlsRole === undefined) {
|
||
pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';
|
||
}
|
||
|
||
pc._remoteDescription = {
|
||
type: description.type,
|
||
sdp: description.sdp
|
||
};
|
||
if (description.type === 'offer') {
|
||
pc._updateSignalingState('have-remote-offer');
|
||
} else {
|
||
pc._updateSignalingState('stable');
|
||
}
|
||
Object.keys(streams).forEach(function(sid) {
|
||
var stream = streams[sid];
|
||
if (stream.getTracks().length) {
|
||
if (pc.remoteStreams.indexOf(stream) === -1) {
|
||
pc.remoteStreams.push(stream);
|
||
var event = new Event('addstream');
|
||
event.stream = stream;
|
||
window.setTimeout(function() {
|
||
pc._dispatchEvent('addstream', event);
|
||
});
|
||
}
|
||
|
||
receiverList.forEach(function(item) {
|
||
var track = item[0];
|
||
var receiver = item[1];
|
||
if (stream.id !== item[2].id) {
|
||
return;
|
||
}
|
||
fireAddTrack(pc, track, receiver, [stream]);
|
||
});
|
||
}
|
||
});
|
||
receiverList.forEach(function(item) {
|
||
if (item[2]) {
|
||
return;
|
||
}
|
||
fireAddTrack(pc, item[0], item[1], []);
|
||
});
|
||
|
||
// check whether addIceCandidate({}) was called within four seconds after
|
||
// setRemoteDescription.
|
||
window.setTimeout(function() {
|
||
if (!(pc && pc.transceivers)) {
|
||
return;
|
||
}
|
||
pc.transceivers.forEach(function(transceiver) {
|
||
if (transceiver.iceTransport &&
|
||
transceiver.iceTransport.state === 'new' &&
|
||
transceiver.iceTransport.getRemoteCandidates().length > 0) {
|
||
console.warn('Timeout for addRemoteCandidate. Consider sending ' +
|
||
'an end-of-candidates notification');
|
||
transceiver.iceTransport.addRemoteCandidate({});
|
||
}
|
||
});
|
||
}, 4000);
|
||
|
||
return Promise.resolve();
|
||
};
|
||
|
||
RTCPeerConnection.prototype.close = function() {
|
||
this.transceivers.forEach(function(transceiver) {
|
||
/* not yet
|
||
if (transceiver.iceGatherer) {
|
||
transceiver.iceGatherer.close();
|
||
}
|
||
*/
|
||
if (transceiver.iceTransport) {
|
||
transceiver.iceTransport.stop();
|
||
}
|
||
if (transceiver.dtlsTransport) {
|
||
transceiver.dtlsTransport.stop();
|
||
}
|
||
if (transceiver.rtpSender) {
|
||
transceiver.rtpSender.stop();
|
||
}
|
||
if (transceiver.rtpReceiver) {
|
||
transceiver.rtpReceiver.stop();
|
||
}
|
||
});
|
||
// FIXME: clean up tracks, local streams, remote streams, etc
|
||
this._isClosed = true;
|
||
this._updateSignalingState('closed');
|
||
};
|
||
|
||
// Update the signaling state.
|
||
RTCPeerConnection.prototype._updateSignalingState = function(newState) {
|
||
this.signalingState = newState;
|
||
var event = new Event('signalingstatechange');
|
||
this._dispatchEvent('signalingstatechange', event);
|
||
};
|
||
|
||
// Determine whether to fire the negotiationneeded event.
|
||
RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {
|
||
var pc = this;
|
||
if (this.signalingState !== 'stable' || this.needNegotiation === true) {
|
||
return;
|
||
}
|
||
this.needNegotiation = true;
|
||
window.setTimeout(function() {
|
||
if (pc.needNegotiation) {
|
||
pc.needNegotiation = false;
|
||
var event = new Event('negotiationneeded');
|
||
pc._dispatchEvent('negotiationneeded', event);
|
||
}
|
||
}, 0);
|
||
};
|
||
|
||
// Update the ice connection state.
|
||
RTCPeerConnection.prototype._updateIceConnectionState = function() {
|
||
var newState;
|
||
var states = {
|
||
'new': 0,
|
||
closed: 0,
|
||
checking: 0,
|
||
connected: 0,
|
||
completed: 0,
|
||
disconnected: 0,
|
||
failed: 0
|
||
};
|
||
this.transceivers.forEach(function(transceiver) {
|
||
if (transceiver.iceTransport && !transceiver.rejected) {
|
||
states[transceiver.iceTransport.state]++;
|
||
}
|
||
});
|
||
|
||
newState = 'new';
|
||
if (states.failed > 0) {
|
||
newState = 'failed';
|
||
} else if (states.checking > 0) {
|
||
newState = 'checking';
|
||
} else if (states.disconnected > 0) {
|
||
newState = 'disconnected';
|
||
} else if (states.new > 0) {
|
||
newState = 'new';
|
||
} else if (states.connected > 0) {
|
||
newState = 'connected';
|
||
} else if (states.completed > 0) {
|
||
newState = 'completed';
|
||
}
|
||
|
||
if (newState !== this.iceConnectionState) {
|
||
this.iceConnectionState = newState;
|
||
var event = new Event('iceconnectionstatechange');
|
||
this._dispatchEvent('iceconnectionstatechange', event);
|
||
}
|
||
};
|
||
|
||
// Update the connection state.
|
||
RTCPeerConnection.prototype._updateConnectionState = function() {
|
||
var newState;
|
||
var states = {
|
||
'new': 0,
|
||
closed: 0,
|
||
connecting: 0,
|
||
connected: 0,
|
||
completed: 0,
|
||
disconnected: 0,
|
||
failed: 0
|
||
};
|
||
this.transceivers.forEach(function(transceiver) {
|
||
if (transceiver.iceTransport && transceiver.dtlsTransport &&
|
||
!transceiver.rejected) {
|
||
states[transceiver.iceTransport.state]++;
|
||
states[transceiver.dtlsTransport.state]++;
|
||
}
|
||
});
|
||
// ICETransport.completed and connected are the same for this purpose.
|
||
states.connected += states.completed;
|
||
|
||
newState = 'new';
|
||
if (states.failed > 0) {
|
||
newState = 'failed';
|
||
} else if (states.connecting > 0) {
|
||
newState = 'connecting';
|
||
} else if (states.disconnected > 0) {
|
||
newState = 'disconnected';
|
||
} else if (states.new > 0) {
|
||
newState = 'new';
|
||
} else if (states.connected > 0) {
|
||
newState = 'connected';
|
||
}
|
||
|
||
if (newState !== this.connectionState) {
|
||
this.connectionState = newState;
|
||
var event = new Event('connectionstatechange');
|
||
this._dispatchEvent('connectionstatechange', event);
|
||
}
|
||
};
|
||
|
||
RTCPeerConnection.prototype.createOffer = function() {
|
||
var pc = this;
|
||
|
||
if (pc._isClosed) {
|
||
return Promise.reject(makeError('InvalidStateError',
|
||
'Can not call createOffer after close'));
|
||
}
|
||
|
||
var numAudioTracks = pc.transceivers.filter(function(t) {
|
||
return t.kind === 'audio';
|
||
}).length;
|
||
var numVideoTracks = pc.transceivers.filter(function(t) {
|
||
return t.kind === 'video';
|
||
}).length;
|
||
|
||
// Determine number of audio and video tracks we need to send/recv.
|
||
var offerOptions = arguments[0];
|
||
if (offerOptions) {
|
||
// Reject Chrome legacy constraints.
|
||
if (offerOptions.mandatory || offerOptions.optional) {
|
||
throw new TypeError(
|
||
'Legacy mandatory/optional constraints not supported.');
|
||
}
|
||
if (offerOptions.offerToReceiveAudio !== undefined) {
|
||
if (offerOptions.offerToReceiveAudio === true) {
|
||
numAudioTracks = 1;
|
||
} else if (offerOptions.offerToReceiveAudio === false) {
|
||
numAudioTracks = 0;
|
||
} else {
|
||
numAudioTracks = offerOptions.offerToReceiveAudio;
|
||
}
|
||
}
|
||
if (offerOptions.offerToReceiveVideo !== undefined) {
|
||
if (offerOptions.offerToReceiveVideo === true) {
|
||
numVideoTracks = 1;
|
||
} else if (offerOptions.offerToReceiveVideo === false) {
|
||
numVideoTracks = 0;
|
||
} else {
|
||
numVideoTracks = offerOptions.offerToReceiveVideo;
|
||
}
|
||
}
|
||
}
|
||
|
||
pc.transceivers.forEach(function(transceiver) {
|
||
if (transceiver.kind === 'audio') {
|
||
numAudioTracks--;
|
||
if (numAudioTracks < 0) {
|
||
transceiver.wantReceive = false;
|
||
}
|
||
} else if (transceiver.kind === 'video') {
|
||
numVideoTracks--;
|
||
if (numVideoTracks < 0) {
|
||
transceiver.wantReceive = false;
|
||
}
|
||
}
|
||
});
|
||
|
||
// Create M-lines for recvonly streams.
|
||
while (numAudioTracks > 0 || numVideoTracks > 0) {
|
||
if (numAudioTracks > 0) {
|
||
pc._createTransceiver('audio');
|
||
numAudioTracks--;
|
||
}
|
||
if (numVideoTracks > 0) {
|
||
pc._createTransceiver('video');
|
||
numVideoTracks--;
|
||
}
|
||
}
|
||
|
||
var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,
|
||
pc._sdpSessionVersion++);
|
||
pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
|
||
// For each track, create an ice gatherer, ice transport,
|
||
// dtls transport, potentially rtpsender and rtpreceiver.
|
||
var track = transceiver.track;
|
||
var kind = transceiver.kind;
|
||
var mid = transceiver.mid || SDPUtils.generateIdentifier();
|
||
transceiver.mid = mid;
|
||
|
||
if (!transceiver.iceGatherer) {
|
||
transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,
|
||
pc.usingBundle);
|
||
}
|
||
|
||
var localCapabilities = window.RTCRtpSender.getCapabilities(kind);
|
||
// filter RTX until additional stuff needed for RTX is implemented
|
||
// in adapter.js
|
||
if (edgeVersion < 15019) {
|
||
localCapabilities.codecs = localCapabilities.codecs.filter(
|
||
function(codec) {
|
||
return codec.name !== 'rtx';
|
||
});
|
||
}
|
||
localCapabilities.codecs.forEach(function(codec) {
|
||
// work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552
|
||
// by adding level-asymmetry-allowed=1
|
||
if (codec.name === 'H264' &&
|
||
codec.parameters['level-asymmetry-allowed'] === undefined) {
|
||
codec.parameters['level-asymmetry-allowed'] = '1';
|
||
}
|
||
|
||
// for subsequent offers, we might have to re-use the payload
|
||
// type of the last offer.
|
||
if (transceiver.remoteCapabilities &&
|
||
transceiver.remoteCapabilities.codecs) {
|
||
transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {
|
||
if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&
|
||
codec.clockRate === remoteCodec.clockRate) {
|
||
codec.preferredPayloadType = remoteCodec.payloadType;
|
||
}
|
||
});
|
||
}
|
||
});
|
||
localCapabilities.headerExtensions.forEach(function(hdrExt) {
|
||
var remoteExtensions = transceiver.remoteCapabilities &&
|
||
transceiver.remoteCapabilities.headerExtensions || [];
|
||
remoteExtensions.forEach(function(rHdrExt) {
|
||
if (hdrExt.uri === rHdrExt.uri) {
|
||
hdrExt.id = rHdrExt.id;
|
||
}
|
||
});
|
||
});
|
||
|
||
// generate an ssrc now, to be used later in rtpSender.send
|
||
var sendEncodingParameters = transceiver.sendEncodingParameters || [{
|
||
ssrc: (2 * sdpMLineIndex + 1) * 1001
|
||
}];
|
||
if (track) {
|
||
// add RTX
|
||
if (edgeVersion >= 15019 && kind === 'video' &&
|
||
!sendEncodingParameters[0].rtx) {
|
||
sendEncodingParameters[0].rtx = {
|
||
ssrc: sendEncodingParameters[0].ssrc + 1
|
||
};
|
||
}
|
||
}
|
||
|
||
if (transceiver.wantReceive) {
|
||
transceiver.rtpReceiver = new window.RTCRtpReceiver(
|
||
transceiver.dtlsTransport, kind);
|
||
}
|
||
|
||
transceiver.localCapabilities = localCapabilities;
|
||
transceiver.sendEncodingParameters = sendEncodingParameters;
|
||
});
|
||
|
||
// always offer BUNDLE and dispose on return if not supported.
|
||
if (pc._config.bundlePolicy !== 'max-compat') {
|
||
sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {
|
||
return t.mid;
|
||
}).join(' ') + '\r\n';
|
||
}
|
||
sdp += 'a=ice-options:trickle\r\n';
|
||
|
||
pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
|
||
sdp += writeMediaSection(transceiver, transceiver.localCapabilities,
|
||
'offer', transceiver.stream, pc._dtlsRole);
|
||
sdp += 'a=rtcp-rsize\r\n';
|
||
|
||
if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&
|
||
(sdpMLineIndex === 0 || !pc.usingBundle)) {
|
||
transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {
|
||
cand.component = 1;
|
||
sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\r\n';
|
||
});
|
||
|
||
if (transceiver.iceGatherer.state === 'completed') {
|
||
sdp += 'a=end-of-candidates\r\n';
|
||
}
|
||
}
|
||
});
|
||
|
||
var desc = new window.RTCSessionDescription({
|
||
type: 'offer',
|
||
sdp: sdp
|
||
});
|
||
return Promise.resolve(desc);
|
||
};
|
||
|
||
RTCPeerConnection.prototype.createAnswer = function() {
|
||
var pc = this;
|
||
|
||
if (pc._isClosed) {
|
||
return Promise.reject(makeError('InvalidStateError',
|
||
'Can not call createAnswer after close'));
|
||
}
|
||
|
||
if (!(pc.signalingState === 'have-remote-offer' ||
|
||
pc.signalingState === 'have-local-pranswer')) {
|
||
return Promise.reject(makeError('InvalidStateError',
|
||
'Can not call createAnswer in signalingState ' + pc.signalingState));
|
||
}
|
||
|
||
var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,
|
||
pc._sdpSessionVersion++);
|
||
if (pc.usingBundle) {
|
||
sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {
|
||
return t.mid;
|
||
}).join(' ') + '\r\n';
|
||
}
|
||
sdp += 'a=ice-options:trickle\r\n';
|
||
|
||
var mediaSectionsInOffer = SDPUtils.getMediaSections(
|
||
pc._remoteDescription.sdp).length;
|
||
pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
|
||
if (sdpMLineIndex + 1 > mediaSectionsInOffer) {
|
||
return;
|
||
}
|
||
if (transceiver.rejected) {
|
||
if (transceiver.kind === 'application') {
|
||
if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt
|
||
sdp += 'm=application 0 DTLS/SCTP 5000\r\n';
|
||
} else {
|
||
sdp += 'm=application 0 ' + transceiver.protocol +
|
||
' webrtc-datachannel\r\n';
|
||
}
|
||
} else if (transceiver.kind === 'audio') {
|
||
sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\r\n' +
|
||
'a=rtpmap:0 PCMU/8000\r\n';
|
||
} else if (transceiver.kind === 'video') {
|
||
sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\r\n' +
|
||
'a=rtpmap:120 VP8/90000\r\n';
|
||
}
|
||
sdp += 'c=IN IP4 0.0.0.0\r\n' +
|
||
'a=inactive\r\n' +
|
||
'a=mid:' + transceiver.mid + '\r\n';
|
||
return;
|
||
}
|
||
|
||
// FIXME: look at direction.
|
||
if (transceiver.stream) {
|
||
var localTrack;
|
||
if (transceiver.kind === 'audio') {
|
||
localTrack = transceiver.stream.getAudioTracks()[0];
|
||
} else if (transceiver.kind === 'video') {
|
||
localTrack = transceiver.stream.getVideoTracks()[0];
|
||
}
|
||
if (localTrack) {
|
||
// add RTX
|
||
if (edgeVersion >= 15019 && transceiver.kind === 'video' &&
|
||
!transceiver.sendEncodingParameters[0].rtx) {
|
||
transceiver.sendEncodingParameters[0].rtx = {
|
||
ssrc: transceiver.sendEncodingParameters[0].ssrc + 1
|
||
};
|
||
}
|
||
}
|
||
}
|
||
|
||
// Calculate intersection of capabilities.
|
||
var commonCapabilities = getCommonCapabilities(
|
||
transceiver.localCapabilities,
|
||
transceiver.remoteCapabilities);
|
||
|
||
var hasRtx = commonCapabilities.codecs.filter(function(c) {
|
||
return c.name.toLowerCase() === 'rtx';
|
||
}).length;
|
||
if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
|
||
delete transceiver.sendEncodingParameters[0].rtx;
|
||
}
|
||
|
||
sdp += writeMediaSection(transceiver, commonCapabilities,
|
||
'answer', transceiver.stream, pc._dtlsRole);
|
||
if (transceiver.rtcpParameters &&
|
||
transceiver.rtcpParameters.reducedSize) {
|
||
sdp += 'a=rtcp-rsize\r\n';
|
||
}
|
||
});
|
||
|
||
var desc = new window.RTCSessionDescription({
|
||
type: 'answer',
|
||
sdp: sdp
|
||
});
|
||
return Promise.resolve(desc);
|
||
};
|
||
|
||
RTCPeerConnection.prototype.addIceCandidate = function(candidate) {
|
||
var pc = this;
|
||
var sections;
|
||
if (candidate && !(candidate.sdpMLineIndex !== undefined ||
|
||
candidate.sdpMid)) {
|
||
return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));
|
||
}
|
||
|
||
// TODO: needs to go into ops queue.
|
||
return new Promise(function(resolve, reject) {
|
||
if (!pc._remoteDescription) {
|
||
return reject(makeError('InvalidStateError',
|
||
'Can not add ICE candidate without a remote description'));
|
||
} else if (!candidate || candidate.candidate === '') {
|
||
for (var j = 0; j < pc.transceivers.length; j++) {
|
||
if (pc.transceivers[j].rejected) {
|
||
continue;
|
||
}
|
||
pc.transceivers[j].iceTransport.addRemoteCandidate({});
|
||
sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
|
||
sections[j] += 'a=end-of-candidates\r\n';
|
||
pc._remoteDescription.sdp =
|
||
SDPUtils.getDescription(pc._remoteDescription.sdp) +
|
||
sections.join('');
|
||
if (pc.usingBundle) {
|
||
break;
|
||
}
|
||
}
|
||
} else {
|
||
var sdpMLineIndex = candidate.sdpMLineIndex;
|
||
if (candidate.sdpMid) {
|
||
for (var i = 0; i < pc.transceivers.length; i++) {
|
||
if (pc.transceivers[i].mid === candidate.sdpMid) {
|
||
sdpMLineIndex = i;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
var transceiver = pc.transceivers[sdpMLineIndex];
|
||
if (transceiver) {
|
||
if (transceiver.rejected) {
|
||
return resolve();
|
||
}
|
||
var cand = Object.keys(candidate.candidate).length > 0 ?
|
||
SDPUtils.parseCandidate(candidate.candidate) : {};
|
||
// Ignore Chrome's invalid candidates since Edge does not like them.
|
||
if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {
|
||
return resolve();
|
||
}
|
||
// Ignore RTCP candidates, we assume RTCP-MUX.
|
||
if (cand.component && cand.component !== 1) {
|
||
return resolve();
|
||
}
|
||
// when using bundle, avoid adding candidates to the wrong
|
||
// ice transport. And avoid adding candidates added in the SDP.
|
||
if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&
|
||
transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {
|
||
if (!maybeAddCandidate(transceiver.iceTransport, cand)) {
|
||
return reject(makeError('OperationError',
|
||
'Can not add ICE candidate'));
|
||
}
|
||
}
|
||
|
||
// update the remoteDescription.
|
||
var candidateString = candidate.candidate.trim();
|
||
if (candidateString.indexOf('a=') === 0) {
|
||
candidateString = candidateString.substr(2);
|
||
}
|
||
sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
|
||
sections[sdpMLineIndex] += 'a=' +
|
||
(cand.type ? candidateString : 'end-of-candidates')
|
||
+ '\r\n';
|
||
pc._remoteDescription.sdp =
|
||
SDPUtils.getDescription(pc._remoteDescription.sdp) +
|
||
sections.join('');
|
||
} else {
|
||
return reject(makeError('OperationError',
|
||
'Can not add ICE candidate'));
|
||
}
|
||
}
|
||
resolve();
|
||
});
|
||
};
|
||
|
||
RTCPeerConnection.prototype.getStats = function(selector) {
|
||
if (selector && selector instanceof window.MediaStreamTrack) {
|
||
var senderOrReceiver = null;
|
||
this.transceivers.forEach(function(transceiver) {
|
||
if (transceiver.rtpSender &&
|
||
transceiver.rtpSender.track === selector) {
|
||
senderOrReceiver = transceiver.rtpSender;
|
||
} else if (transceiver.rtpReceiver &&
|
||
transceiver.rtpReceiver.track === selector) {
|
||
senderOrReceiver = transceiver.rtpReceiver;
|
||
}
|
||
});
|
||
if (!senderOrReceiver) {
|
||
throw makeError('InvalidAccessError', 'Invalid selector.');
|
||
}
|
||
return senderOrReceiver.getStats();
|
||
}
|
||
|
||
var promises = [];
|
||
this.transceivers.forEach(function(transceiver) {
|
||
['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',
|
||
'dtlsTransport'].forEach(function(method) {
|
||
if (transceiver[method]) {
|
||
promises.push(transceiver[method].getStats());
|
||
}
|
||
});
|
||
});
|
||
return Promise.all(promises).then(function(allStats) {
|
||
var results = new Map();
|
||
allStats.forEach(function(stats) {
|
||
stats.forEach(function(stat) {
|
||
results.set(stat.id, stat);
|
||
});
|
||
});
|
||
return results;
|
||
});
|
||
};
|
||
|
||
// fix low-level stat names and return Map instead of object.
|
||
var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',
|
||
'RTCIceTransport', 'RTCDtlsTransport'];
|
||
ortcObjects.forEach(function(ortcObjectName) {
|
||
var obj = window[ortcObjectName];
|
||
if (obj && obj.prototype && obj.prototype.getStats) {
|
||
var nativeGetstats = obj.prototype.getStats;
|
||
obj.prototype.getStats = function() {
|
||
return nativeGetstats.apply(this)
|
||
.then(function(nativeStats) {
|
||
var mapStats = new Map();
|
||
Object.keys(nativeStats).forEach(function(id) {
|
||
nativeStats[id].type = fixStatsType(nativeStats[id]);
|
||
mapStats.set(id, nativeStats[id]);
|
||
});
|
||
return mapStats;
|
||
});
|
||
};
|
||
}
|
||
});
|
||
|
||
// legacy callback shims. Should be moved to adapter.js some days.
|
||
var methods = ['createOffer', 'createAnswer'];
|
||
methods.forEach(function(method) {
|
||
var nativeMethod = RTCPeerConnection.prototype[method];
|
||
RTCPeerConnection.prototype[method] = function() {
|
||
var args = arguments;
|
||
if (typeof args[0] === 'function' ||
|
||
typeof args[1] === 'function') { // legacy
|
||
return nativeMethod.apply(this, [arguments[2]])
|
||
.then(function(description) {
|
||
if (typeof args[0] === 'function') {
|
||
args[0].apply(null, [description]);
|
||
}
|
||
}, function(error) {
|
||
if (typeof args[1] === 'function') {
|
||
args[1].apply(null, [error]);
|
||
}
|
||
});
|
||
}
|
||
return nativeMethod.apply(this, arguments);
|
||
};
|
||
});
|
||
|
||
methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];
|
||
methods.forEach(function(method) {
|
||
var nativeMethod = RTCPeerConnection.prototype[method];
|
||
RTCPeerConnection.prototype[method] = function() {
|
||
var args = arguments;
|
||
if (typeof args[1] === 'function' ||
|
||
typeof args[2] === 'function') { // legacy
|
||
return nativeMethod.apply(this, arguments)
|
||
.then(function() {
|
||
if (typeof args[1] === 'function') {
|
||
args[1].apply(null);
|
||
}
|
||
}, function(error) {
|
||
if (typeof args[2] === 'function') {
|
||
args[2].apply(null, [error]);
|
||
}
|
||
});
|
||
}
|
||
return nativeMethod.apply(this, arguments);
|
||
};
|
||
});
|
||
|
||
// getStats is special. It doesn't have a spec legacy method yet we support
|
||
// getStats(something, cb) without error callbacks.
|
||
['getStats'].forEach(function(method) {
|
||
var nativeMethod = RTCPeerConnection.prototype[method];
|
||
RTCPeerConnection.prototype[method] = function() {
|
||
var args = arguments;
|
||
if (typeof args[1] === 'function') {
|
||
return nativeMethod.apply(this, arguments)
|
||
.then(function() {
|
||
if (typeof args[1] === 'function') {
|
||
args[1].apply(null);
|
||
}
|
||
});
|
||
}
|
||
return nativeMethod.apply(this, arguments);
|
||
};
|
||
});
|
||
|
||
return RTCPeerConnection;
|
||
};
|