/**
* Function that creates the Peer connection offer session description.
* @method _doOffer
* @private
* @for Skylink
* @since 0.5.2
*/
Skylink.prototype._doOffer = function(targetMid, iceRestart) {
var self = this;
var pc = self._peerConnections[targetMid];
// Added checks to ensure that connection object is defined first
if (!pc) {
log.warn([targetMid, 'RTCSessionDescription', 'offer', 'Dropping of creating of offer ' +
'as connection does not exists']);
return;
}
// Added checks to ensure that state is "stable" if setting local "offer"
if (pc.signalingState !== self.PEER_CONNECTION_STATE.STABLE) {
log.warn([targetMid, 'RTCSessionDescription', 'offer',
'Dropping of creating of offer as signalingState is not "' +
self.PEER_CONNECTION_STATE.STABLE + '" ->'], pc.signalingState);
return;
}
var offerConstraints = {
offerToReceiveAudio: !(!self._sdpSettings.connection.audio && targetMid !== 'MCU') && self._getSDPCommonSupports(targetMid).video,
offerToReceiveVideo: !(!self._sdpSettings.connection.video && targetMid !== 'MCU') && self._getSDPCommonSupports(targetMid).audio,
iceRestart: !!((self._peerInformations[targetMid] || {}).config || {}).enableIceRestart &&
iceRestart && self._enableIceRestart,
voiceActivityDetection: self._voiceActivityDetection
};
// Add stream only at offer/answer end
if (!self._hasMCU || targetMid === 'MCU') {
self._addLocalMediaStreams(targetMid);
}
if (self._initOptions.enableDataChannel && self._peerInformations[targetMid] &&
self._peerInformations[targetMid].config.enableDataChannel/* &&
!(!self._sdpSettings.connection.data && targetMid !== 'MCU')*/) {
// Edge doesn't support datachannels yet
if (!(self._dataChannels[targetMid] && self._dataChannels[targetMid].main)) {
self._createDataChannel(targetMid);
self._peerConnections[targetMid].hasMainChannel = true;
}
}
log.debug([targetMid, null, null, 'Creating offer with config:'], offerConstraints);
pc.endOfCandidates = false;
if (self._peerConnStatus[targetMid]) {
self._peerConnStatus[targetMid].sdpConstraints = offerConstraints;
}
var onSuccessCbFn = function(offer) {
log.debug([targetMid, null, null, 'Created offer'], offer);
self._setLocalAndSendMessage(targetMid, offer);
};
var onErrorCbFn = function(error) {
self._trigger('handshakeProgress', self.HANDSHAKE_PROGRESS.ERROR, targetMid, error);
log.error([targetMid, null, null, 'Failed creating an offer:'], error);
};
pc.createOffer(onSuccessCbFn, onErrorCbFn, AdapterJS.webrtcDetectedType === 'plugin' ? {
mandatory: {
OfferToReceiveAudio: offerConstraints.offerToReceiveAudio,
OfferToReceiveVideo: offerConstraints.offerToReceiveVideo,
iceRestart: offerConstraints.iceRestart,
voiceActivityDetection: offerConstraints.voiceActivityDetection
}
} : offerConstraints);
};
/**
* Function that creates the Peer connection answer session description.
* This comes after receiving and setting the offer session description.
* @method _doAnswer
* @private
* @for Skylink
* @since 0.1.0
*/
Skylink.prototype._doAnswer = function(targetMid) {
var self = this;
log.log([targetMid, null, null, 'Creating answer with config:'],
self._room.connection.sdpConstraints);
var pc = self._peerConnections[targetMid];
// Added checks to ensure that connection object is defined first
if (!pc) {
log.warn([targetMid, 'RTCSessionDescription', 'answer', 'Dropping of creating of answer ' +
'as connection does not exists']);
return;
}
// Added checks to ensure that state is "have-remote-offer" if setting local "answer"
if (pc.signalingState !== self.PEER_CONNECTION_STATE.HAVE_REMOTE_OFFER) {
log.warn([targetMid, 'RTCSessionDescription', 'answer',
'Dropping of creating of answer as signalingState is not "' +
self.PEER_CONNECTION_STATE.HAVE_REMOTE_OFFER + '" ->'], pc.signalingState);
return;
}
var answerConstraints = AdapterJS.webrtcDetectedBrowser === 'edge' ? {
offerToReceiveVideo: !(!self._sdpSettings.connection.audio && targetMid !== 'MCU') &&
self._getSDPCommonSupports(targetMid, pc.remoteDescription).video,
offerToReceiveAudio: !(!self._sdpSettings.connection.video && targetMid !== 'MCU') &&
self._getSDPCommonSupports(targetMid, pc.remoteDescription).audio,
voiceActivityDetection: self._voiceActivityDetection
} : undefined;
// Add stream only at offer/answer end
if (!self._hasMCU || targetMid === 'MCU') {
self._addLocalMediaStreams(targetMid);
}
if (self._peerConnStatus[targetMid]) {
self._peerConnStatus[targetMid].sdpConstraints = answerConstraints;
}
var onSuccessCbFn = function(answer) {
log.debug([targetMid, null, null, 'Created answer'], answer);
self._setLocalAndSendMessage(targetMid, answer);
};
var onErrorCbFn = function(error) {
log.error([targetMid, null, null, 'Failed creating an answer:'], error);
self._trigger('handshakeProgress', self.HANDSHAKE_PROGRESS.ERROR, targetMid, error);
};
// No ICE restart constraints for createAnswer as it fails in chrome 48
// { iceRestart: true }
pc.createAnswer(onSuccessCbFn, onErrorCbFn, answerConstraints);
};
/**
* Function that sets the local session description and sends to Peer.
* If trickle ICE is disabled, the local session description will be sent after
* ICE gathering has been completed.
* @method _setLocalAndSendMessage
* @private
* @for Skylink
* @since 0.5.2
*/
Skylink.prototype._setLocalAndSendMessage = function(targetMid, _sessionDescription) {
var self = this;
var pc = self._peerConnections[targetMid];
// Added checks to ensure that sessionDescription is defined first
if (!(!!_sessionDescription && !!_sessionDescription.sdp)) {
log.warn([targetMid, 'RTCSessionDescription', null, 'Local session description is undefined ->'], _sessionDescription);
return;
}
// Added checks to ensure that connection object is defined first
if (!pc) {
log.warn([targetMid, 'RTCSessionDescription', _sessionDescription.type,
'Local session description will not be set as connection does not exists ->'], _sessionDescription);
return;
} else if (_sessionDescription.type === self.HANDSHAKE_PROGRESS.OFFER &&
pc.signalingState !== self.PEER_CONNECTION_STATE.STABLE) {
log.warn([targetMid, 'RTCSessionDescription', _sessionDescription.type, 'Local session description ' +
'will not be set as signaling state is "' + pc.signalingState + '" ->'], _sessionDescription);
return;
// Added checks to ensure that state is "have-remote-offer" if setting local "answer"
} else if (_sessionDescription.type === self.HANDSHAKE_PROGRESS.ANSWER &&
pc.signalingState !== self.PEER_CONNECTION_STATE.HAVE_REMOTE_OFFER) {
log.warn([targetMid, 'RTCSessionDescription', _sessionDescription.type, 'Local session description ' +
'will not be set as signaling state is "' + pc.signalingState + '" ->'], _sessionDescription);
return;
// Added checks if there is a current local sessionDescription being processing before processing this one
} else if (pc.processingLocalSDP) {
log.warn([targetMid, 'RTCSessionDescription', _sessionDescription.type,
'Local session description will not be set as another is being processed ->'], _sessionDescription);
return;
}
pc.processingLocalSDP = true;
// Sets and expected receiving codecs etc.
var sessionDescription = {
type: _sessionDescription.type,
sdp: _sessionDescription.sdp
};
sessionDescription.sdp = self._removeSDPFirefoxH264Pref(targetMid, sessionDescription);
sessionDescription.sdp = self._setSDPCodecParams(targetMid, sessionDescription);
sessionDescription.sdp = self._removeSDPUnknownAptRtx(targetMid, sessionDescription);
sessionDescription.sdp = self._removeSDPCodecs(targetMid, sessionDescription);
sessionDescription.sdp = self._handleSDPConnectionSettings(targetMid, sessionDescription, 'local');
sessionDescription.sdp = self._removeSDPREMBPackets(targetMid, sessionDescription);
log.log([targetMid, 'RTCSessionDescription', sessionDescription.type,
'Local session description updated ->'], sessionDescription.sdp);
var onSuccessCbFn = function() {
log.debug([targetMid, 'RTCSessionDescription', sessionDescription.type,
'Local session description has been set ->'], sessionDescription);
pc.processingLocalSDP = false;
self._trigger('handshakeProgress', sessionDescription.type, targetMid);
if (sessionDescription.type === self.HANDSHAKE_PROGRESS.ANSWER) {
pc.setAnswer = 'local';
} else {
pc.setOffer = 'local';
}
if (!self._initOptions.enableIceTrickle && !pc.gathered) {
log.log([targetMid, 'RTCSessionDescription', sessionDescription.type,
'Local session description sending is halted to complete ICE gathering.']);
return;
}
self._sendChannelMessage({
type: sessionDescription.type,
sdp: self._renderSDPOutput(targetMid, sessionDescription),
mid: self._user.sid,
target: targetMid,
rid: self._room.id,
userInfo: self._getUserInfo(targetMid)
});
};
var onErrorCbFn = function(error) {
log.error([targetMid, 'RTCSessionDescription', sessionDescription.type, 'Local description failed setting ->'], error);
pc.processingLocalSDP = false;
self._trigger('handshakeProgress', self.HANDSHAKE_PROGRESS.ERROR, targetMid, error);
};
pc.setLocalDescription(new RTCSessionDescription(sessionDescription), onSuccessCbFn, onErrorCbFn);
};