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index.js
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index.js
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module.exports = (function(){
var RTCSessionDescription = require('rtc-session-description');
var SDP = require('sdp');
var RTCPeerConnection = function(configuration,constraints) {
this.configuration = configuration;
this.constraints = constraints;
this.id = (new Date()).valueOf();
this.localDescription = null; // a RTCSessionDescription
this.remoteDescription = null; // a RTCSessionDescription
this._localSession = null; // a SDP.Session
this._remoteSession = null; // a SDP.Session
// http://www.w3.org/TR/webrtc/#dom-peerconnection-signaling-state
this.signalingState = 'stable';
this.iceConnectionState = 'new';
this.iceGatheringState = 'new';
this.onnegotiationneeded = null;
this.onicecandidate = null;
this.onsignalingstatechange = null;
this.onaddstream = null;
this.onremovestream = null;
this.oniceconnectionstatechange = null;
this._localStreamSet = []; // set of streams being sent from this object
this._remoteStreamSet = []; // set of streams being received by this object
};
RTCPeerConnection.prototype = {
localSDPSession: function() {
// generate SDP: complete set (since this is an offer)
var media = [];
// Flattens media and tracks. This should use RFC3388 instead.
this._localStreamSet.forEach(function(m) {
var d = m.description();
if(d.length) {
d.forEach(function(track) {
media.push(track);
});
} else {
media.push(d);
}
});
var session = new SDP.Session({
origin: {
username: 'RTCPeerConnection',
sessionID: this.id,
sessionVersion: 1,
netType: 'IN',
addrType: 'IP4',
address: (this.configuration.signalling ? this.configuration.signalling.address : null) || '127.0.0.1'
},
media: media
});
return session;
},
createOffer: function(success,failure,constraints) {
// generate SDP: complete set (since this is an offer)
var session = this.localSDPSession();
var sdp = new RTCSessionDescription({type:'offer',sdp:session.toSDP()});
success(sdp);
},
createAnswer: function(success,failure,constraints) {
// generate SDP: restricted set (since this is an answer)
var session = this.localSDPSession();
// See http://datatracker.ietf.org/doc/draft-ietf-rtcweb-jsep/ for 'answer' vs 'pranswer'
var sdp = new RTCSessionDescription({type:'answer',sdp:session.toSDP()});
success(sdp);
},
setLocalSession: function(session,success,failure) {
// FIXME: Should negotiate SDP content.
this._localSession = session;
success();
},
setRemoteSession: function(session,success,failure) {
// FIXME: Should negotiate SDP content.
this._remoteSession = session;
success();
},
setLocalDescription: function(description,success,failure) {
var self = this;
// If this RTCPeerConnection object's signaling state is closed, the user agent MUST throw an InvalidStateError exception and abort this operation.
if(this.signalingState === 'closed') {
throw new InvalidStateError();
}
// If a local description contains a different set of ICE credentials, then the ICE Agent MUST trigger an ICE restart.
// Not-supported.
var session = SDP.parse(description.sdp,this._localSession);
if(!session) {
if(this.signalingState !== 'closed') {
failure({name:' InvalidSessionDescriptionError'}); // FIXME: should be DOMError
}
}
this.setLocalSession(
session,
function() {
// If connection's signaling state is closed, then abort these steps.
if(self.signalingState === 'closed') {
return
}
// Set connection's description attribute (localDescription or remoteDescription depending on the setting operation) to the RTCSessionDescription argument.
self.localDescription = description;
self._localSession = session;
// If the local description was set, connection's ice gathering state is new, and the local description contains media, then set connection's ice gathering state to gathering.
// If the local description was set with content that caused an ICE restart, then set connection's ice gathering state to gathering.
if(self.iceGatheringState === 'new') {
self.iceGatheringState = 'gathering';
}
// Set connection's signalingState accordingly.
switch(self.signalingState + '.' + description.type) {
case 'stable.answer':
self.signalingState = 'have-local-offer';
break;
case 'have-local-offer.offer':
// same state
break;
case 'have-remote-offer.answer':
self.signalingState = 'stable';
break;
case 'have-remote-offer.pranswer':
self.signalingState = 'have-local-pranswer';
break;
case 'have-local-pranswer.pranswer':
// same state
break;
case 'have-local-pranswer.answer':
self.signalingState = 'stable';
break;
// other state transitions are invalid, actually
}
// Fire a simple event named signalingstatechange at connection.
if(self.onsignalingstatechange) {
self.onsignalingstatechange({}); // FIXME: Event
}
// Queue a new task that, if connection's signalingState is not closed, invokes the successCallback.
if(self.signalingState !== 'closed') {
success();
}
// EXTRA: Simulate ICE gathering process is done:
self.iceGatheringState = 'completed';
if(self.onicecandidate) {
self.onicecandidate({ candidate: null }); // FIXME candidate
}
},
function() {
if(self.signalingState !== 'closed') {
failure({name:' IncompatibleSessionDescriptionError'});
}
}
);
},
setRemoteDescription: function(description,success,failure) {
var self = this;
// If this RTCPeerConnection object's signaling state is closed, the user agent MUST throw an InvalidStateError exception and abort this operation.
if(this.signalingState === 'closed') {
throw new InvalidStateError();
}
// FIXME: should we accumulate like this?
var session = SDP.parse(description.sdp,this._remoteSession);
if(!session) {
if(this.signalingState !== 'closed') {
failure({name:' InvalidSessionDescriptionError'}); // FIXME: should be DOMError
}
}
this.setRemoteSession(
session,
function() {
// If connection's signaling state is closed, then abort these steps.
if(self.signalingState === 'closed') {
return
}
// Set connection's description attribute (localDescription or remoteDescription depending on the setting operation) to the RTCSessionDescription argument.
self.remoteDescription = description;
self._remoteSession = session;
// Set connection's signalingState accordingly.
switch(self.signalingState + '.' + description.type) {
case 'stable.offer':
self.signalingState = 'have-remote-offer';
break;
case 'have-remote-offer.offer':
// same state
break;
case 'have-local-offer.answer':
self.signalingState = 'stable';
break;
case 'have-local-offer.pranswer':
self.signalingState = 'have-remote-pranswer';
break;
case 'have-remote-pranswer.pranswer':
// same state
break;
case 'have-remote-pranswer.answer':
self.signalingState = 'stable';
break;
// other state transitions are invalid, actually
}
// Fire a simple event named signalingstatechange at connection.
if(self.onsignalingstatechange) {
self.onsignalingstatechange({}); // FIXME: Event
}
// Queue a new task that, if connection's signalingState is not closed, invokes the successCallback.
if(self.signalingState !== 'closed') {
success();
}
},
function() {
if(self.signalingState !== 'closed') {
failure({name:' IncompatibleSessionDescriptionError'});
}
}
);
},
updateIce: function(configuration,constraints) {
// Do nothing, ICE not supported.
},
addIceCandidate: function(candidate,success,failure) {
failure(new Error('addIceCandidate not implemented'));
},
getLocalStreams: function() {
return this._localStreamSet;
},
getRemoteStreams: function() {
return this._remoteStreamSet;
},
getStreamById: function(id) {
return this._localStreamSet.filter(function(_){return _.id === id}).shift() ||
this._remoteStreamSet.filter(function(_){return _.id === id}).shift();
},
addStream: function(stream,constraints) {
// If connection's RTCPeerConnection signalingState is closed, throw an InvalidStateError exception and abort these steps.
if(this.signalingState === 'closed') {
throw new InvalidStateError();
}
// If stream is already in connection's local streams set, then abort these steps.
if(this.getStreamById(stream.id)) {
return;
}
// Add stream to connection's local streams set.
this._localStreamSet.push(stream);
// If connection's RTCPeerConnection signalingState is stable, then fire a negotiationneeded event at connection.
if(this.signalingState === 'stable' && this.onnegotiationneeded) {
this.onnegotiationneeded.apply(this);
}
},
removeStream: function(stream) {
// If connection's RTCPeerConnection signalingState is closed, throw an InvalidStateError exception.
if(this.signalingState === 'closed') {
throw new InvalidStateError();
}
// If stream is not in connection's local streams set, then abort these steps.
if(!this.getStreamById(stream.id)) {
return;
}
// Remove stream from connection's local streams set.
this._localStreamSet = this._localStreamSet.filter(function(_){return _.id !== stream.id});
// If connection's RTCPeerConnection signalingState is stable, then fire a negotiationneeded event at connection.
if(this.signalingState === 'stable' && this.onnegotiationneeded) {
this.onnegotiationneeded.apply(this);
}
},
close: function () {
// If the RTCPeerConnection object's RTCPeerConnection signalingState is closed, throw an InvalidStateError exception.
if(this.signalingState === 'closed') {
throw new InvalidStateError();
}
// Destroy the RTCPeerConnection ICE Agent, abruptly ending any active ICE processing and any active streaming, and releasing any relevant resources (e.g. TURN permissions).
// ICE not supported
// stop active streaming
this._localStreamSet.map( function(m) { m.stop(); });
this._remoteStreamSet.map( function(m) { m.stop(); });
// Set the object's RTCPeerConnection signalingState to closed.
this.signalingState = 'closed';
},
_addRemoteStream: function(stream,constraints) {
if(this.signalingState === 'closed') {
throw new InvalidStateError();
}
if(this.getStreamById(stream.id)) {
return;
}
this._remoteStreamSet.push(stream);
if(this.signalingState === 'stable' && this.onaddstream) {
this.onaddstream({stream:stream}); // FIXME: MediaStreamEvent
}
},
_removeRemoteStream: function(stream) {
if(this.signalingState === 'closed') {
throw new InvalidStateError();
}
if(!this.getStreamById(stream.id)) {
return;
}
this._remoteStreamSet = this._remoteStreamSet.filter(function(_){return _.id !== stream.id});
if(this.signalingState === 'stable' && this.onremovestream) {
this.onremovestream({stream:stream});
}
},
};
return RTCPeerConnection;
}());