jiti-meet/simulcast.js

1265 lines
36 KiB
JavaScript

/*jslint plusplus: true */
/*jslint nomen: true*/
/**
*
* @constructor
*/
function SimulcastUtils() {
this.logger = new SimulcastLogger("SimulcastUtils", 1);
}
/**
*
* @type {{}}
* @private
*/
SimulcastUtils.prototype._emptyCompoundIndex = {};
/**
*
* @param lines
* @param videoSources
* @private
*/
SimulcastUtils.prototype._replaceVideoSources = function (lines, videoSources) {
var i, inVideo = false, index = -1, howMany = 0;
this.logger.info('Replacing video sources...');
for (i = 0; i < lines.length; i++) {
if (inVideo && lines[i].substring(0, 'm='.length) === 'm=') {
// Out of video.
break;
}
if (!inVideo && lines[i].substring(0, 'm=video '.length) === 'm=video ') {
// In video.
inVideo = true;
}
if (inVideo && (lines[i].substring(0, 'a=ssrc:'.length) === 'a=ssrc:'
|| lines[i].substring(0, 'a=ssrc-group:'.length) === 'a=ssrc-group:')) {
if (index === -1) {
index = i;
}
howMany++;
}
}
// efficiency baby ;)
lines.splice.apply(lines,
[index, howMany].concat(videoSources));
};
SimulcastUtils.prototype.isValidDescription = function (desc)
{
return desc && desc != null
&& desc.type && desc.type != ''
&& desc.sdp && desc.sdp != '';
};
SimulcastUtils.prototype._getVideoSources = function (lines) {
var i, inVideo = false, sb = [];
this.logger.info('Getting video sources...');
for (i = 0; i < lines.length; i++) {
if (inVideo && lines[i].substring(0, 'm='.length) === 'm=') {
// Out of video.
break;
}
if (!inVideo && lines[i].substring(0, 'm=video '.length) === 'm=video ') {
// In video.
inVideo = true;
}
if (inVideo && lines[i].substring(0, 'a=ssrc:'.length) === 'a=ssrc:') {
// In SSRC.
sb.push(lines[i]);
}
if (inVideo && lines[i].substring(0, 'a=ssrc-group:'.length) === 'a=ssrc-group:') {
sb.push(lines[i]);
}
}
return sb;
};
SimulcastUtils.prototype.parseMedia = function (lines, mediatypes) {
var i, res = [], type, cur_media, idx, ssrcs, cur_ssrc, ssrc,
ssrc_attribute, group, semantics, skip;
this.logger.info('Parsing media sources...');
for (i = 0; i < lines.length; i++) {
if (lines[i].substring(0, 'm='.length) === 'm=') {
type = lines[i]
.substr('m='.length, lines[i].indexOf(' ') - 'm='.length);
skip = mediatypes !== undefined && mediatypes.indexOf(type) === -1;
if (!skip) {
cur_media = {
'type': type,
'sources': {},
'groups': []
};
res.push(cur_media);
}
} else if (!skip && lines[i].substring(0, 'a=ssrc:'.length) === 'a=ssrc:') {
idx = lines[i].indexOf(' ');
ssrc = lines[i].substring('a=ssrc:'.length, idx);
if (cur_media.sources[ssrc] === undefined) {
cur_ssrc = {'ssrc': ssrc};
cur_media.sources[ssrc] = cur_ssrc;
}
ssrc_attribute = lines[i].substr(idx + 1).split(':', 2)[0];
cur_ssrc[ssrc_attribute] = lines[i].substr(idx + 1).split(':', 2)[1];
if (cur_media.base === undefined) {
cur_media.base = cur_ssrc;
}
} else if (!skip && lines[i].substring(0, 'a=ssrc-group:'.length) === 'a=ssrc-group:') {
idx = lines[i].indexOf(' ');
semantics = lines[i].substr(0, idx).substr('a=ssrc-group:'.length);
ssrcs = lines[i].substr(idx).trim().split(' ');
group = {
'semantics': semantics,
'ssrcs': ssrcs
};
cur_media.groups.push(group);
} else if (!skip && (lines[i].substring(0, 'a=sendrecv'.length) === 'a=sendrecv' ||
lines[i].substring(0, 'a=recvonly'.length) === 'a=recvonly' ||
lines[i].substring(0, 'a=sendonly'.length) === 'a=sendonly' ||
lines[i].substring(0, 'a=inactive'.length) === 'a=inactive')) {
cur_media.direction = lines[i].substring('a='.length);
}
}
return res;
};
/**
* The _indexOfArray() method returns the first a CompoundIndex at which a
* given element can be found in the array, or _emptyCompoundIndex if it is
* not present.
*
* Example:
*
* _indexOfArray('3', [ 'this is line 1', 'this is line 2', 'this is line 3' ])
*
* returns {row: 2, column: 14}
*
* @param needle
* @param haystack
* @param start
* @returns {}
* @private
*/
SimulcastUtils.prototype._indexOfArray = function (needle, haystack, start) {
var length = haystack.length, idx, i;
if (!start) {
start = 0;
}
for (i = start; i < length; i++) {
idx = haystack[i].indexOf(needle);
if (idx !== -1) {
return {row: i, column: idx};
}
}
return this._emptyCompoundIndex;
};
SimulcastUtils.prototype._removeSimulcastGroup = function (lines) {
var i;
for (i = lines.length - 1; i >= 0; i--) {
if (lines[i].indexOf('a=ssrc-group:SIM') !== -1) {
lines.splice(i, 1);
}
}
};
SimulcastUtils.prototype._compileVideoSources = function (videoSources) {
var sb = [], ssrc, addedSSRCs = [];
this.logger.info('Compiling video sources...');
// Add the groups
if (videoSources.groups && videoSources.groups.length !== 0) {
videoSources.groups.forEach(function (group) {
if (group.ssrcs && group.ssrcs.length !== 0) {
sb.push([['a=ssrc-group:', group.semantics].join(''), group.ssrcs.join(' ')].join(' '));
// if (group.semantics !== 'SIM') {
group.ssrcs.forEach(function (ssrc) {
addedSSRCs.push(ssrc);
sb.splice.apply(sb, [sb.length, 0].concat([
["a=ssrc:", ssrc, " cname:", videoSources.sources[ssrc].cname].join(''),
["a=ssrc:", ssrc, " msid:", videoSources.sources[ssrc].msid].join('')]));
});
//}
}
});
}
// Then add any free sources.
if (videoSources.sources) {
for (ssrc in videoSources.sources) {
if (addedSSRCs.indexOf(ssrc) === -1) {
sb.splice.apply(sb, [sb.length, 0].concat([
["a=ssrc:", ssrc, " cname:", videoSources.sources[ssrc].cname].join(''),
["a=ssrc:", ssrc, " msid:", videoSources.sources[ssrc].msid].join('')]));
}
}
}
return sb;
};
function SimulcastReceiver() {
this.simulcastUtils = new SimulcastUtils();
this.logger = new SimulcastLogger('SimulcastReceiver', 1);
}
SimulcastReceiver.prototype._remoteVideoSourceCache = '';
SimulcastReceiver.prototype._remoteMaps = {
msid2Quality: {},
ssrc2Msid: {},
msid2ssrc: {},
receivingVideoStreams: {}
};
SimulcastReceiver.prototype._cacheRemoteVideoSources = function (lines) {
this._remoteVideoSourceCache = this.simulcastUtils._getVideoSources(lines);
};
SimulcastReceiver.prototype._restoreRemoteVideoSources = function (lines) {
this.simulcastUtils._replaceVideoSources(lines, this._remoteVideoSourceCache);
};
SimulcastReceiver.prototype._ensureGoogConference = function (lines) {
var sb;
this.logger.info('Ensuring x-google-conference flag...')
if (this.simulcastUtils._indexOfArray('a=x-google-flag:conference', lines) === this.simulcastUtils._emptyCompoundIndex) {
// TODO(gp) do that for the audio as well as suggested by fippo.
// Add the google conference flag
sb = this.simulcastUtils._getVideoSources(lines);
sb = ['a=x-google-flag:conference'].concat(sb);
this.simulcastUtils._replaceVideoSources(lines, sb);
}
};
SimulcastReceiver.prototype._restoreSimulcastGroups = function (sb) {
this._restoreRemoteVideoSources(sb);
};
/**
* Restores the simulcast groups of the remote description. In
* transformRemoteDescription we remove those in order for the set remote
* description to succeed. The focus needs the signal the groups to new
* participants.
*
* @param desc
* @returns {*}
*/
SimulcastReceiver.prototype.reverseTransformRemoteDescription = function (desc) {
var sb;
if (!this.simulcastUtils.isValidDescription(desc)) {
return desc;
}
if (config.enableSimulcast) {
sb = desc.sdp.split('\r\n');
this._restoreSimulcastGroups(sb);
desc = new RTCSessionDescription({
type: desc.type,
sdp: sb.join('\r\n')
});
}
return desc;
};
SimulcastUtils.prototype._ensureOrder = function (lines) {
var videoSources, sb;
videoSources = this.parseMedia(lines, ['video'])[0];
sb = this._compileVideoSources(videoSources);
this._replaceVideoSources(lines, sb);
};
SimulcastReceiver.prototype._updateRemoteMaps = function (lines) {
var remoteVideoSources = this.simulcastUtils.parseMedia(lines, ['video'])[0],
videoSource, quality;
// (re) initialize the remote maps.
this._remoteMaps.msid2Quality = {};
this._remoteMaps.ssrc2Msid = {};
this._remoteMaps.msid2ssrc = {};
var self = this;
if (remoteVideoSources.groups && remoteVideoSources.groups.length !== 0) {
remoteVideoSources.groups.forEach(function (group) {
if (group.semantics === 'SIM' && group.ssrcs && group.ssrcs.length !== 0) {
quality = 0;
group.ssrcs.forEach(function (ssrc) {
videoSource = remoteVideoSources.sources[ssrc];
self._remoteMaps.msid2Quality[videoSource.msid] = quality++;
self._remoteMaps.ssrc2Msid[videoSource.ssrc] = videoSource.msid;
self._remoteMaps.msid2ssrc[videoSource.msid] = videoSource.ssrc;
});
}
});
}
};
SimulcastReceiver.prototype._setReceivingVideoStream = function (resource, ssrc) {
this._remoteMaps.receivingVideoStreams[resource] = ssrc;
};
/**
* Returns a stream with single video track, the one currently being
* received by this endpoint.
*
* @param stream the remote simulcast stream.
* @returns {webkitMediaStream}
*/
SimulcastReceiver.prototype.getReceivingVideoStream = function (stream) {
var tracks, i, electedTrack, msid, quality = 0, receivingTrackId;
var self = this;
if (config.enableSimulcast) {
stream.getVideoTracks().some(function (track) {
return Object.keys(self._remoteMaps.receivingVideoStreams).some(function (resource) {
var ssrc = self._remoteMaps.receivingVideoStreams[resource];
var msid = self._remoteMaps.ssrc2Msid[ssrc];
if (msid == [stream.id, track.id].join(' ')) {
electedTrack = track;
return true;
}
});
});
if (!electedTrack) {
// we don't have an elected track, choose by initial quality.
tracks = stream.getVideoTracks();
for (i = 0; i < tracks.length; i++) {
msid = [stream.id, tracks[i].id].join(' ');
if (this._remoteMaps.msid2Quality[msid] === quality) {
electedTrack = tracks[i];
break;
}
}
// TODO(gp) if the initialQuality could not be satisfied, lower
// the requirement and try again.
}
}
return (electedTrack)
? new webkitMediaStream([electedTrack])
: stream;
};
SimulcastReceiver.prototype.getReceivingSSRC = function (jid) {
var resource = Strophe.getResourceFromJid(jid);
var ssrc = this._remoteMaps.receivingVideoStreams[resource];
// If we haven't receiving a "changed" event yet, then we must be receiving
// low quality (that the sender always streams).
if (!ssrc && connection.jingle) {
var session;
var i, j, k;
var keys = Object.keys(connection.jingle.sessions);
for (i = 0; i < keys.length; i++) {
var sid = keys[i];
if (ssrc) {
// stream found, stop.
break;
}
session = connection.jingle.sessions[sid];
if (session.remoteStreams) {
for (j = 0; j < session.remoteStreams.length; j++) {
var remoteStream = session.remoteStreams[j];
if (ssrc) {
// stream found, stop.
break;
}
var tracks = remoteStream.getVideoTracks();
if (tracks) {
for (k = 0; k < tracks.length; k++) {
var track = tracks[k];
var msid = [remoteStream.id, track.id].join(' ');
var _ssrc = this._remoteMaps.msid2ssrc[msid];
var _jid = ssrc2jid[_ssrc];
var quality = this._remoteMaps.msid2Quality[msid];
if (jid == _jid && quality == 0) {
ssrc = _ssrc;
// stream found, stop.
break;
}
}
}
}
}
}
}
return ssrc;
};
SimulcastReceiver.prototype.getReceivingVideoStreamBySSRC = function (ssrc)
{
var session, electedStream;
var i, j, k;
if (connection.jingle) {
var keys = Object.keys(connection.jingle.sessions);
for (i = 0; i < keys.length; i++) {
var sid = keys[i];
if (electedStream) {
// stream found, stop.
break;
}
session = connection.jingle.sessions[sid];
if (session.remoteStreams) {
for (j = 0; j < session.remoteStreams.length; j++) {
var remoteStream = session.remoteStreams[j];
if (electedStream) {
// stream found, stop.
break;
}
var tracks = remoteStream.getVideoTracks();
if (tracks) {
for (k = 0; k < tracks.length; k++) {
var track = tracks[k];
var msid = [remoteStream.id, track.id].join(' ');
var tmp = this._remoteMaps.msid2ssrc[msid];
if (tmp == ssrc) {
electedStream = new webkitMediaStream([track]);
// stream found, stop.
break;
}
}
}
}
}
}
}
return {
session: session,
stream: electedStream
};
};
/**
* Gets the fully qualified msid (stream.id + track.id) associated to the
* SSRC.
*
* @param ssrc
* @returns {*}
*/
SimulcastReceiver.prototype.getRemoteVideoStreamIdBySSRC = function (ssrc) {
return this._remoteMaps.ssrc2Msid[ssrc];
};
function SimulcastSender() {
this.simulcastUtils = new SimulcastUtils();
this.logger = new SimulcastLogger('SimulcastSender', 1);
}
SimulcastSender.prototype.displayedLocalVideoStream = null;
SimulcastSender.prototype._generateGuid = (function () {
function s4() {
return Math.floor((1 + Math.random()) * 0x10000)
.toString(16)
.substring(1);
}
return function () {
return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
s4() + '-' + s4() + s4() + s4();
};
}());
// Returns a random integer between min (included) and max (excluded)
// Using Math.round() gives a non-uniform distribution!
SimulcastSender.prototype._generateRandomSSRC = function () {
var min = 0, max = 0xffffffff;
return Math.floor(Math.random() * (max - min)) + min;
};
SimulcastSender.prototype.getLocalVideoStream = function () {
return (this.displayedLocalVideoStream != null)
? this.displayedLocalVideoStream
// in case we have no simulcast at all, i.e. we didn't perform the GUM
: connection.jingle.localVideo;
};
function NativeSimulcastSender() {
SimulcastSender.call(this); // call the super constructor.
}
NativeSimulcastSender.prototype = Object.create(SimulcastSender.prototype);
NativeSimulcastSender.prototype._localExplosionMap = {};
NativeSimulcastSender.prototype._isUsingScreenStream = false;
NativeSimulcastSender.prototype._localVideoSourceCache = '';
NativeSimulcastSender.prototype.reset = function () {
this._localExplosionMap = {};
this._isUsingScreenStream = isUsingScreenStream;
};
NativeSimulcastSender.prototype._cacheLocalVideoSources = function (lines) {
this._localVideoSourceCache = this.simulcastUtils._getVideoSources(lines);
};
NativeSimulcastSender.prototype._restoreLocalVideoSources = function (lines) {
this.simulcastUtils._replaceVideoSources(lines, this._localVideoSourceCache);
};
NativeSimulcastSender.prototype._appendSimulcastGroup = function (lines) {
var videoSources, ssrcGroup, simSSRC, numOfSubs = 2, i, sb, msid;
this.logger.info('Appending simulcast group...');
// Get the primary SSRC information.
videoSources = this.simulcastUtils.parseMedia(lines, ['video'])[0];
// Start building the SIM SSRC group.
ssrcGroup = ['a=ssrc-group:SIM'];
// The video source buffer.
sb = [];
// Create the simulcast sub-streams.
for (i = 0; i < numOfSubs; i++) {
// TODO(gp) prevent SSRC collision.
simSSRC = this._generateRandomSSRC();
ssrcGroup.push(simSSRC);
sb.splice.apply(sb, [sb.length, 0].concat(
[["a=ssrc:", simSSRC, " cname:", videoSources.base.cname].join(''),
["a=ssrc:", simSSRC, " msid:", videoSources.base.msid].join('')]
));
this.logger.info(['Generated substream ', i, ' with SSRC ', simSSRC, '.'].join(''));
}
// Add the group sim layers.
sb.splice(0, 0, ssrcGroup.join(' '))
this.simulcastUtils._replaceVideoSources(lines, sb);
};
// Does the actual patching.
NativeSimulcastSender.prototype._ensureSimulcastGroup = function (lines) {
this.logger.info('Ensuring simulcast group...');
if (this.simulcastUtils._indexOfArray('a=ssrc-group:SIM', lines) === this.simulcastUtils._emptyCompoundIndex) {
this._appendSimulcastGroup(lines);
this._cacheLocalVideoSources(lines);
} else {
// verify that the ssrcs participating in the SIM group are present
// in the SDP (needed for presence).
this._restoreLocalVideoSources(lines);
}
};
/**
* Produces a single stream with multiple tracks for local video sources.
*
* @param lines
* @private
*/
NativeSimulcastSender.prototype._explodeSimulcastSenderSources = function (lines) {
var sb, msid, sid, tid, videoSources, self;
this.logger.info('Exploding local video sources...');
videoSources = this.simulcastUtils.parseMedia(lines, ['video'])[0];
self = this;
if (videoSources.groups && videoSources.groups.length !== 0) {
videoSources.groups.forEach(function (group) {
if (group.semantics === 'SIM') {
group.ssrcs.forEach(function (ssrc) {
// Get the msid for this ssrc..
if (self._localExplosionMap[ssrc]) {
// .. either from the explosion map..
msid = self._localExplosionMap[ssrc];
} else {
// .. or generate a new one (msid).
sid = videoSources.sources[ssrc].msid
.substring(0, videoSources.sources[ssrc].msid.indexOf(' '));
tid = self._generateGuid();
msid = [sid, tid].join(' ');
self._localExplosionMap[ssrc] = msid;
}
// Assign it to the source object.
videoSources.sources[ssrc].msid = msid;
// TODO(gp) Change the msid of associated sources.
});
}
});
}
sb = this.simulcastUtils._compileVideoSources(videoSources);
this.simulcastUtils._replaceVideoSources(lines, sb);
};
/**
* GUM for simulcast.
*
* @param constraints
* @param success
* @param err
*/
NativeSimulcastSender.prototype.getUserMedia = function (constraints, success, err) {
// There's nothing special to do for native simulcast, so just do a normal GUM.
navigator.webkitGetUserMedia(constraints, function (hqStream) {
success(hqStream);
}, err);
};
/**
* Prepares the local description for public usage (i.e. to be signaled
* through Jingle to the focus).
*
* @param desc
* @returns {RTCSessionDescription}
*/
NativeSimulcastSender.prototype.reverseTransformLocalDescription = function (desc) {
var sb;
if (!this.simulcastUtils.isValidDescription(desc) || this._isUsingScreenStream) {
return desc;
}
sb = desc.sdp.split('\r\n');
this._explodeSimulcastSenderSources(sb);
desc = new RTCSessionDescription({
type: desc.type,
sdp: sb.join('\r\n')
});
this.logger.fine(['Exploded local video sources', desc.sdp].join(' '));
return desc;
};
/**
* Ensures that the simulcast group is present in the answer, _if_ native
* simulcast is enabled,
*
* @param desc
* @returns {*}
*/
NativeSimulcastSender.prototype.transformAnswer = function (desc) {
if (!this.simulcastUtils.isValidDescription(desc) || this._isUsingScreenStream) {
return desc;
}
var sb = desc.sdp.split('\r\n');
// Even if we have enabled native simulcasting previously
// (with a call to SLD with an appropriate SDP, for example),
// createAnswer seems to consistently generate incomplete SDP
// with missing SSRCS.
//
// So, subsequent calls to SLD will have missing SSRCS and presence
// won't have the complete list of SRCs.
this._ensureSimulcastGroup(sb);
desc = new RTCSessionDescription({
type: desc.type,
sdp: sb.join('\r\n')
});
this.logger.fine(['Transformed answer', desc.sdp].join(' '));
return desc;
};
/**
*
*
* @param desc
* @returns {*}
*/
NativeSimulcastSender.prototype.transformLocalDescription = function (desc) {
return desc;
};
/**
* Removes the ssrc-group:SIM from the remote description bacause Chrome
* either gets confused and thinks this is an FID group or, if an FID group
* is already present, it fails to set the remote description.
*
* @param desc
* @returns {*}
*/
SimulcastReceiver.prototype.transformRemoteDescription = function (desc) {
if (desc && desc.sdp) {
var sb = desc.sdp.split('\r\n');
this._updateRemoteMaps(sb);
this._cacheRemoteVideoSources(sb);
// NOTE(gp) this needs to be called after updateRemoteMaps because we
// need the simulcast group in the _updateRemoteMaps() method.
this.simulcastUtils._removeSimulcastGroup(sb);
if (desc.sdp.indexOf('a=ssrc-group:SIM') !== -1) {
// We don't need the goog conference flag if we're not doing
// simulcast.
this._ensureGoogConference(sb);
}
desc = new RTCSessionDescription({
type: desc.type,
sdp: sb.join('\r\n')
});
this.logger.fine(['Transformed remote description', desc.sdp].join(' '));
}
return desc;
};
NativeSimulcastSender.prototype._setLocalVideoStreamEnabled = function (ssrc, enabled) {
// Nothing to do here, native simulcast does that auto-magically.
};
NativeSimulcastSender.prototype.constructor = NativeSimulcastSender;
function SimpleSimulcastSender() {
SimulcastSender.call(this);
}
SimpleSimulcastSender.prototype = Object.create(SimulcastSender.prototype);
SimpleSimulcastSender.prototype.localStream = null;
SimpleSimulcastSender.prototype._localMaps = {
msids: [],
msid2ssrc: {}
};
/**
* Groups local video sources together in the ssrc-group:SIM group.
*
* @param lines
* @private
*/
SimpleSimulcastSender.prototype._groupLocalVideoSources = function (lines) {
var sb, videoSources, ssrcs = [], ssrc;
this.logger.info('Grouping local video sources...');
videoSources = this.simulcastUtils.parseMedia(lines, ['video'])[0];
for (ssrc in videoSources.sources) {
// jitsi-meet destroys/creates streams at various places causing
// the original local stream ids to change. The only thing that
// remains unchanged is the trackid.
this._localMaps.msid2ssrc[videoSources.sources[ssrc].msid.split(' ')[1]] = ssrc;
}
var self = this;
// TODO(gp) add only "free" sources.
this._localMaps.msids.forEach(function (msid) {
ssrcs.push(self._localMaps.msid2ssrc[msid]);
});
if (!videoSources.groups) {
videoSources.groups = [];
}
videoSources.groups.push({
'semantics': 'SIM',
'ssrcs': ssrcs
});
sb = this.simulcastUtils._compileVideoSources(videoSources);
this.simulcastUtils._replaceVideoSources(lines, sb);
};
/**
* GUM for simulcast.
*
* @param constraints
* @param success
* @param err
*/
SimpleSimulcastSender.prototype.getUserMedia = function (constraints, success, err) {
// TODO(gp) what if we request a resolution not supported by the hardware?
// TODO(gp) make the lq stream configurable; although this wouldn't work with native simulcast
var lqConstraints = {
audio: false,
video: {
mandatory: {
maxWidth: 320,
maxHeight: 180,
maxFrameRate: 15
}
}
};
this.logger.info('HQ constraints: ', constraints);
this.logger.info('LQ constraints: ', lqConstraints);
// NOTE(gp) if we request the lq stream first webkitGetUserMedia
// fails randomly. Tested with Chrome 37. As fippo suggested, the
// reason appears to be that Chrome only acquires the cam once and
// then downscales the picture (https://code.google.com/p/chromium/issues/detail?id=346616#c11)
var self = this;
navigator.webkitGetUserMedia(constraints, function (hqStream) {
self.localStream = hqStream;
// reset local maps.
self._localMaps.msids = [];
self._localMaps.msid2ssrc = {};
// add hq trackid to local map
self._localMaps.msids.push(hqStream.getVideoTracks()[0].id);
navigator.webkitGetUserMedia(lqConstraints, function (lqStream) {
self.displayedLocalVideoStream = lqStream;
// NOTE(gp) The specification says Array.forEach() will visit
// the array elements in numeric order, and that it doesn't
// visit elements that don't exist.
// add lq trackid to local map
self._localMaps.msids.splice(0, 0, lqStream.getVideoTracks()[0].id);
self.localStream.addTrack(lqStream.getVideoTracks()[0]);
success(self.localStream);
}, err);
}, err);
};
/**
* Prepares the local description for public usage (i.e. to be signaled
* through Jingle to the focus).
*
* @param desc
* @returns {RTCSessionDescription}
*/
SimpleSimulcastSender.prototype.reverseTransformLocalDescription = function (desc) {
var sb;
if (!this.simulcastUtils.isValidDescription(desc)) {
return desc;
}
sb = desc.sdp.split('\r\n');
this._groupLocalVideoSources(sb);
desc = new RTCSessionDescription({
type: desc.type,
sdp: sb.join('\r\n')
});
this.logger.fine('Grouped local video sources');
this.logger.fine(desc.sdp);
return desc;
};
/**
* Ensures that the simulcast group is present in the answer, _if_ native
* simulcast is enabled,
*
* @param desc
* @returns {*}
*/
SimpleSimulcastSender.prototype.transformAnswer = function (desc) {
return desc;
};
/**
*
*
* @param desc
* @returns {*}
*/
SimpleSimulcastSender.prototype.transformLocalDescription = function (desc) {
var sb = desc.sdp.split('\r\n');
this.simulcastUtils._removeSimulcastGroup(sb);
desc = new RTCSessionDescription({
type: desc.type,
sdp: sb.join('\r\n')
});
this.logger.fine('Transformed local description');
this.logger.fine(desc.sdp);
return desc;
};
SimpleSimulcastSender.prototype._setLocalVideoStreamEnabled = function (ssrc, enabled) {
var trackid;
var self = this;
this.logger.log(['Requested to', enabled ? 'enable' : 'disable', ssrc].join(' '));
if (Object.keys(this._localMaps.msid2ssrc).some(function (tid) {
// Search for the track id that corresponds to the ssrc
if (self._localMaps.msid2ssrc[tid] == ssrc) {
trackid = tid;
return true;
}
}) && self.localStream.getVideoTracks().some(function (track) {
// Start/stop the track that corresponds to the track id
if (track.id === trackid) {
track.enabled = enabled;
return true;
}
})) {
this.logger.log([trackid, enabled ? 'enabled' : 'disabled'].join(' '));
$(document).trigger(enabled
? 'simulcastlayerstarted'
: 'simulcastlayerstopped');
} else {
this.logger.error("I don't have a local stream with SSRC " + ssrc);
}
};
SimpleSimulcastSender.prototype.constructor = SimpleSimulcastSender;
function NoSimulcastSender() {
SimulcastSender.call(this);
}
NoSimulcastSender.prototype = Object.create(SimulcastSender.prototype);
/**
* GUM for simulcast.
*
* @param constraints
* @param success
* @param err
*/
NoSimulcastSender.prototype.getUserMedia = function (constraints, success, err) {
navigator.webkitGetUserMedia(constraints, function (hqStream) {
success(hqStream);
}, err);
};
/**
* Prepares the local description for public usage (i.e. to be signaled
* through Jingle to the focus).
*
* @param desc
* @returns {RTCSessionDescription}
*/
NoSimulcastSender.prototype.reverseTransformLocalDescription = function (desc) {
return desc;
};
/**
* Ensures that the simulcast group is present in the answer, _if_ native
* simulcast is enabled,
*
* @param desc
* @returns {*}
*/
NoSimulcastSender.prototype.transformAnswer = function (desc) {
return desc;
};
/**
*
*
* @param desc
* @returns {*}
*/
NoSimulcastSender.prototype.transformLocalDescription = function (desc) {
return desc;
};
NoSimulcastSender.prototype._setLocalVideoStreamEnabled = function (ssrc, enabled) {
};
NoSimulcastSender.prototype.constructor = NoSimulcastSender;
/**
*
* @constructor
*/
function SimulcastManager() {
// Create the simulcast utilities.
this.simulcastUtils = new SimulcastUtils();
// Create remote simulcast.
this.simulcastReceiver = new SimulcastReceiver();
// Initialize local simulcast.
// TODO(gp) move into SimulcastManager.prototype.getUserMedia and take into
// account constraints.
if (!config.enableSimulcast) {
this.simulcastSender = new NoSimulcastSender();
} else {
var isChromium = window.chrome,
vendorName = window.navigator.vendor;
if(isChromium !== null && isChromium !== undefined
/* skip opera */
&& vendorName === "Google Inc."
/* skip Chromium as suggested by fippo */
&& !window.navigator.appVersion.match(/Chromium\//) ) {
var ver = parseInt(window.navigator.appVersion.match(/Chrome\/(\d+)\./)[1], 10);
if (ver > 37) {
this.simulcastSender = new NativeSimulcastSender();
} else {
this.simulcastSender = new NoSimulcastSender();
}
} else {
this.simulcastSender = new NoSimulcastSender();
}
}
}
/**
* Restores the simulcast groups of the remote description. In
* transformRemoteDescription we remove those in order for the set remote
* description to succeed. The focus needs the signal the groups to new
* participants.
*
* @param desc
* @returns {*}
*/
SimulcastManager.prototype.reverseTransformRemoteDescription = function (desc) {
return this.simulcastReceiver.reverseTransformRemoteDescription(desc);
};
/**
* Removes the ssrc-group:SIM from the remote description bacause Chrome
* either gets confused and thinks this is an FID group or, if an FID group
* is already present, it fails to set the remote description.
*
* @param desc
* @returns {*}
*/
SimulcastManager.prototype.transformRemoteDescription = function (desc) {
return this.simulcastReceiver.transformRemoteDescription(desc);
};
/**
* Gets the fully qualified msid (stream.id + track.id) associated to the
* SSRC.
*
* @param ssrc
* @returns {*}
*/
SimulcastManager.prototype.getRemoteVideoStreamIdBySSRC = function (ssrc) {
return this.simulcastReceiver.getRemoteVideoStreamIdBySSRC(ssrc);
};
/**
* Returns a stream with single video track, the one currently being
* received by this endpoint.
*
* @param stream the remote simulcast stream.
* @returns {webkitMediaStream}
*/
SimulcastManager.prototype.getReceivingVideoStream = function (stream) {
return this.simulcastReceiver.getReceivingVideoStream(stream);
};
/**
*
*
* @param desc
* @returns {*}
*/
SimulcastManager.prototype.transformLocalDescription = function (desc) {
return this.simulcastSender.transformLocalDescription(desc);
};
/**
*
* @returns {*}
*/
SimulcastManager.prototype.getLocalVideoStream = function() {
return this.simulcastSender.getLocalVideoStream();
};
/**
* GUM for simulcast.
*
* @param constraints
* @param success
* @param err
*/
SimulcastManager.prototype.getUserMedia = function (constraints, success, err) {
this.simulcastSender.getUserMedia(constraints, success, err);
};
/**
* Prepares the local description for public usage (i.e. to be signaled
* through Jingle to the focus).
*
* @param desc
* @returns {RTCSessionDescription}
*/
SimulcastManager.prototype.reverseTransformLocalDescription = function (desc) {
return this.simulcastSender.reverseTransformLocalDescription(desc);
};
/**
* Ensures that the simulcast group is present in the answer, _if_ native
* simulcast is enabled,
*
* @param desc
* @returns {*}
*/
SimulcastManager.prototype.transformAnswer = function (desc) {
return this.simulcastSender.transformAnswer(desc);
};
SimulcastManager.prototype.getReceivingSSRC = function (jid) {
return this.simulcastReceiver.getReceivingSSRC(jid);
};
SimulcastManager.prototype.getReceivingVideoStreamBySSRC = function (msid) {
return this.simulcastReceiver.getReceivingVideoStreamBySSRC(msid);
};
/**
*
* @param lines
* @param mediatypes
* @returns {*}
*/
SimulcastManager.prototype.parseMedia = function(lines, mediatypes) {
var sb = lines.sdp.split('\r\n');
return this.simulcastUtils.parseMedia(sb, mediatypes);
};
SimulcastManager.prototype._setReceivingVideoStream = function(resource, ssrc) {
this.simulcastReceiver._setReceivingVideoStream(resource, ssrc);
};
SimulcastManager.prototype._setLocalVideoStreamEnabled = function(ssrc, enabled) {
this.simulcastSender._setLocalVideoStreamEnabled(ssrc, enabled);
};
SimulcastManager.prototype.resetSender = function() {
if (typeof this.simulcastSender.reset === 'function'){
this.simulcastSender.reset();
}
};
/**
*
* @constructor
*/
function SimulcastLogger(name, lvl) {
this.name = name;
this.lvl = lvl;
}
SimulcastLogger.prototype.log = function (text) {
if (this.lvl) {
console.log(text);
}
};
SimulcastLogger.prototype.info = function (text) {
if (this.lvl > 1) {
console.info(text);
}
};
SimulcastLogger.prototype.fine = function (text) {
if (this.lvl > 2) {
console.log(text);
}
};
SimulcastLogger.prototype.error = function (text) {
console.error(text);
};
var simulcast = new SimulcastManager();
$(document).bind('simulcastlayerschanged', function (event, endpointSimulcastLayers) {
endpointSimulcastLayers.forEach(function (esl) {
var ssrc = esl.simulcastLayer.primarySSRC;
simulcast._setReceivingVideoStream(esl.endpoint, ssrc);
});
});
$(document).bind('startsimulcastlayer', function (event, simulcastLayer) {
var ssrc = simulcastLayer.primarySSRC;
simulcast._setLocalVideoStreamEnabled(ssrc, true);
});
$(document).bind('stopsimulcastlayer', function (event, simulcastLayer) {
var ssrc = simulcastLayer.primarySSRC;
simulcast._setLocalVideoStreamEnabled(ssrc, false);
});