diff --git a/lib/call.js b/lib/call.js index a3492b7..3198c69 100644 --- a/lib/call.js +++ b/lib/call.js @@ -1,526 +1,525 @@ 'use strict'; import debug from 'debug'; import { v4 as uuidv4 } from 'uuid'; -import utils from './utils'; - import { EventEmitter } from 'events'; import { Statistics } from './statistics'; +import utils from './utils'; const DEBUG = debug('sylkrtc:Call'); class Call extends EventEmitter { constructor(account) { super(); this._account = account; this._id = null; this._callId = null; this._direction = null; this._pc = null; this._state = null; this._terminated = false; this._incomingSdp = null; this._remoteMediaDirections = {}; this._localIdentity = new utils.Identity(account.id, account.displayName); this._remoteIdentity = null; this._remoteStreams = new MediaStream(); this._localStreams = new MediaStream(); this._previousTrack = null; this._sharingScreen = false; this._dtmfSender = null; this._delay_established = false; // set to true when we need to delay posting the state change to 'established' this._setup_in_progress = false; // set while we set the remote description and setup the peer copnnection this._statistics = new Statistics(); // bind some handlers to this instance this._onDtmf = this._onDtmf.bind(this); } get account() { return this._account; } get id() { return this._id; } get callId() { return this._callId; } get statistics() { return this._statistics; } get sharingScreen() { return this._sharingScreen; } get direction() { return this._direction; } get state() { return this._state; } get localIdentity() { return this._localIdentity; } get remoteIdentity() { return this._remoteIdentity; } get remoteMediaDirections() { return this._remoteMediaDirections; } getLocalStreams() { if (this._pc !== null) { if (this._pc.getSenders) { this._pc.getSenders().forEach((e) => { if (e.track != null) { if (e.track.readyState !== "ended") { this._localStreams.addTrack(e.track); } else { this._localStreams.removeTrack(e.track); } } }); return [this._localStreams]; } else { return this._pc.getLocalStreams(); } } else { return []; } } getRemoteStreams() { if (this._pc !== null) { if (this._pc.getReceivers) { this._pc.getReceivers().forEach((e) => { if (e.track.readyState !== "ended") { this._remoteStreams.addTrack(e.track); } }); return [this._remoteStreams]; } else { return this._pc.getRemoteStreams(); } } else { return []; } } getSenders() { if (this._pc !== null) { return this._pc.getSenders(); } else { return []; } } getReceivers() { if (this._pc !== null) { return this._pc.getReceivers(); } else { return []; } } answer(options = {}) { if (this._state !== 'incoming') { throw new Error('Call is not in the incoming state: ' + this._state); } if (!options.localStream) { throw new Error('Missing localStream'); } const pcConfig = options.pcConfig || {iceServers:[]}; const answerOptions = options.answerOptions; // Create the RTCPeerConnection this._initRTCPeerConnection(pcConfig); this._pc.addStream(options.localStream); this.emit('localStreamAdded', options.localStream); this._pc.setRemoteDescription(new RTCSessionDescription({type: 'offer', sdp: this._incomingSdp})) // success .then(() => { utils.createLocalSdp(this._pc, 'answer', answerOptions) .then((sdp) => { DEBUG('Local SDP: %s', sdp); this._sendAnswer(sdp); }) .catch((reason) => { DEBUG(reason); this.terminate(); }); }) // failure .catch((error) => { DEBUG('Error setting remote description: %s', error); this.terminate(); }); } startScreensharing(newTrack) { let oldTrack = this.getLocalStreams()[0].getVideoTracks()[0]; this.replaceTrack(oldTrack, newTrack, true, (value) => { this._sharingScreen = value; }); } stopScreensharing() { let oldTrack = this.getLocalStreams()[0].getVideoTracks()[0]; this.replaceTrack(oldTrack, this._previousTrack); this._sharingScreen = false; } replaceTrack(oldTrack, newTrack, keep=false, cb=null) { let sender; for (sender of this._pc.getSenders()) { if (sender.track === oldTrack) { break; } } sender.replaceTrack(newTrack) .then(() => { if (keep) { this._previousTrack = oldTrack; } else { if (oldTrack) { oldTrack.stop(); } if (newTrack === this._previousTrack) { this._previousTrack = null; } } if (oldTrack) { this._localStreams.removeTrack(oldTrack); } this._localStreams.addTrack(newTrack); if (cb) { cb(true); } }).catch((error)=> { DEBUG('Error replacing track: %s', error); }); } terminate() { if (this._terminated) { return; } DEBUG('Terminating call'); this._sendTerminate(); } sendDtmf(tones, duration=100, interToneGap=70) { DEBUG('sendDtmf()'); if (this._dtmfSender === null) { if (this._pc !== null) { let track = null; try { track = this._pc.getLocalStreams()[0].getAudioTracks()[0]; } catch (e) { // ignore } if (track !== null) { DEBUG('Creating DTMF sender'); if (this._pc.getSenders) { this._dtmfSender = this._pc.getSenders()[0].dtmf; } else { DEBUG("Your browser doesn't support RTCPeerConnection.getSenders(), so " + "falling back to use deprecated createDTMFSender() " + "instead."); this._dtmfSender = this._pc.createDTMFSender(track); } if (this._dtmfSender) { this._dtmfSender.addEventListener('tonechange', this._onDtmf); } } } } if (this._dtmfSender) { DEBUG('Sending DTMF tones'); this._dtmfSender.insertDTMF(tones, duration, interToneGap); } } // Private API _initOutgoing(uri, options={}) { if (uri.indexOf('@') === -1) { throw new Error('Invalid URI'); } if (!options.localStream) { throw new Error('Missing localStream'); } this._id = options.id || uuidv4(); this._direction = 'outgoing'; this._remoteIdentity = new utils.Identity(uri); const pcConfig = options.pcConfig || {iceServers:[]}; const offerOptions = options.offerOptions; // Create the RTCPeerConnection this._initRTCPeerConnection(pcConfig); this._pc.addStream(options.localStream); this.emit('localStreamAdded', options.localStream); utils.createLocalSdp(this._pc, 'offer', offerOptions) .then((sdp) => { DEBUG('Local SDP: %s', sdp); this._sendCall(uri, sdp); }) .catch((reason) => { DEBUG(reason); this._localTerminate(reason); }); } _initIncoming(id, caller, sdp, callId) { this._id = id; this._remoteIdentity = new utils.Identity(caller.uri, caller.display_name); this._incomingSdp = sdp; this._direction = 'incoming'; this._state = 'incoming'; this._callId = callId; this._remoteMediaDirections = Object.assign( {audio: [], video:[]}, utils.getMediaDirections(sdp) ); DEBUG('Remote SDP: %s', sdp); } _handleEvent(message) { DEBUG('Call event: %o', message); switch (message.event) { case 'state': let oldState = this._state; let newState = message.state; this._state = newState; if ((newState === 'accepted' || newState === 'early-media') && this._direction === 'outgoing') { DEBUG('Call accepted or early media'); this.emit('stateChanged', oldState, newState, {}); if (message.sdp !== undefined) { const sdp = utils.mungeSdp(message.sdp); DEBUG('Remote SDP: %s', sdp); this._remoteMediaDirections = Object.assign( {audio: [], video:[]}, utils.getMediaDirections(sdp) ); this._setup_in_progress = true; this._callId = message.call_id; this._pc.setRemoteDescription(new RTCSessionDescription({type: 'answer', sdp: sdp})) // success .then(() => { this._setup_in_progress = false; if (!this._terminated) { if (this._delay_established) { oldState = this._state; this._state = 'established'; DEBUG('Setting delayed established state!'); this.emit('stateChanged', oldState, this._state, {}); this._delay_established = false; } } }) // failure .catch((error) => { DEBUG('Error accepting call or early media: %s', error); this.terminate(); }); } } else if (newState === 'established' && this._direction === 'outgoing') { if (this._setup_in_progress) { this._delay_established = true; } else { this.emit('stateChanged', oldState, newState, {}); } } else if (newState === 'terminated') { this.emit('stateChanged', oldState, newState, {reason: message.reason}); this._terminated = true; this._account._calls.delete(this.id); this._closeRTCPeerConnection(); } else { this.emit('stateChanged', oldState, newState, {}); } break; default: break; } } _initRTCPeerConnection(pcConfig) { if (this._pc !== null) { throw new Error('RTCPeerConnection already initialized'); } this._pc = new RTCPeerConnection(pcConfig); this._pc.addEventListener('addstream', (event) => { DEBUG('Stream added'); this.emit('streamAdded', event.stream); }); this._pc.addEventListener('icecandidate', (event) => { if (event.candidate !== null) { DEBUG('New ICE candidate %o', event.candidate); } else { DEBUG('ICE candidate gathering finished'); } this._sendTrickle(event.candidate); }); this._statistics.addConnection({pc:this._pc, peerId: this._id}); } _sendRequest(req, cb) { this._account._sendRequest(req, cb); } _sendCall(uri, sdp) { const req = { sylkrtc: 'session-create', account: this.account.id, session: this.id, uri: uri, sdp: sdp }; this._sendRequest(req, (error) => { if (error) { DEBUG('Call error: %s', error); this._localTerminate(error); } }); } _sendTerminate() { const req = { sylkrtc: 'session-terminate', session: this.id }; this._sendRequest(req, (error) => { if (error) { DEBUG('Error terminating call: %s', error); this._localTerminate(error); } }); setTimeout(() => { if (!this._terminated) { DEBUG('Timeout terminating call'); this._localTerminate('200 OK'); } this._terminated = true; }, 150); } _sendTrickle(candidate) { const req = { sylkrtc: 'session-trickle', session: this.id, candidates: candidate !== null ? [candidate] : [], }; this._sendRequest(req, (error) => { if (error) { DEBUG('Trickle error: %s', error); this._localTerminate(error); } }); } _sendAnswer(sdp) { const req = { sylkrtc: 'session-answer', session: this.id, sdp: sdp }; this._sendRequest(req, (error) => { if (error) { DEBUG('Answer error: %s', error); this.terminate(); } }); } _closeRTCPeerConnection() { DEBUG('Closing RTCPeerConnection'); if (this._pc !== null) { let tempStream; if (this._pc.getSenders) { let tracks = []; for (let track of this._pc.getSenders()) { if (track.track != null ) { tracks = tracks.concat(track.track); } if (this._previousTrack !== null) { tracks = tracks.concat(this._previousTrack); } } if (tracks.length !== 0) { tempStream = new MediaStream(tracks); utils.closeMediaStream(tempStream); } } else { for (let stream of this._pc.getLocalStreams()) { if (this._previousTrack !== null) { stream = stream.concat(this._previousTrack); } utils.closeMediaStream(stream); } } if (this._pc.getReceivers) { let tracks = []; for (let track of this._pc.getReceivers()) { tracks = tracks.concat(track.track); } tempStream = new MediaStream(tracks); utils.closeMediaStream(tempStream); } else { for (let stream of this._pc.getRemoteStreams()) { utils.closeMediaStream(stream); } } this._statistics.removeConnection({pc:this._pc, peerId: this._id}); this._pc.close(); this._pc = null; if (this._dtmfSender !== null) { this._dtmfSender.removeEventListener('tonechange', this._onDtmf); this._dtmfSender = null; } } } _localTerminate(error) { if (this._terminated) { return; } DEBUG('Local terminate'); this._account._calls.delete(this.id); this._terminated = true; const oldState = this._state; const newState = 'terminated'; const data = { reason: error.toString() }; this._closeRTCPeerConnection(); this.emit('stateChanged', oldState, newState, data); } _onDtmf(event) { DEBUG('Sent DTMF tone %s', event.tone); this.emit('dtmfToneSent', event.tone); } } export { Call };