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Declare local variables for constants, SFU SDK, local display and controls
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const constants = SFU.constants; const sfu = SFU; let localDisplay; let cControls; |
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Declare default room and publishing configuration which will be used if there was no config.json file available
With this config client will be preconfigured to connect to localhost over WSS, enter room "ROOM1" with pin "1234" and nickname "Alice". Media section directs client to publish audio and video tracks. Video will have two sub-tracks - high (h) and medium (m).
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const defaultConfig = { room: { url: "wss://127.0.0.1:8888", name: "ROOM1", pin: "1234", nickName: "Alice" }, media: { audio: { tracks: [ { source: "mic", channels: 1 } ] }, video: { tracks: [ { source: "camera", width: 1280, height: 720, codec: "H264", encodings: [ { rid: "h", active: true, maxBitrate: 900000 }, { rid: "m", active: true, maxBitrate: 300000, scaleResolutionDownBy: 2 } ] } ] } } }; |
3. Initialization
init() code
Init function that is called when page is finished loading. The function will load config.json or default config, create local display and open entrance modal window.
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4. Connect to the server and create or enter to the room
connect() code
Connect function that is called once user clicks Enter in entrance modal window.
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Hide modal as we don't need it anymore and mute controls before connect is established
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//hide modal $('#entranceModal').modal('hide'); //disable controls cControls.muteInput(); |
Create PeerConnection and prepare the room config for the creation of session and room
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//create peer connection const pc = new RTCPeerConnection(); //get config object for room creation const roomConfig = cControls.roomConfig(); roomConfig.pc = pc; |
Create session (which will automatically connect to the server)
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const session = sfu.createRoom(roomConfig); |
Subscribe to session's "CONNECTED" event
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session.on(constants.SFU_EVENT.CONNECTED, function(room) { |
Once we are connected initialize room chat
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//connected to server const chatDiv = document.getElementById('messages'); const chatInput = document.getElementById('localMessage'); const chatButton = document.getElementById('sendMessage'); //create and bind chat to the new room createChat(room, chatDiv, chatInput, chatButton); |
Subscribe to room error events
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room.on(constants.SFU_ROOM_EVENT.FAILED, function(e) { const errField = document.getElementById("errorMsg"); errField.style.color = "red"; errField.innerText = e; }).on(constants.SFU_ROOM_EVENT.OPERATION_FAILED, function (e) { const errField = document.getElementById("errorMsg"); errField.style.color = "red"; errField.innerText = e.operation + " failed: " + e.error; }) |
Initialize remote display
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//setup remote display for showing remote audio/video tracks const remoteDisplay = document.getElementById("display"); initRemoteDisplay(room, remoteDisplay, pc); |
Get preconfigured local media from controls
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//get configured local video streams let streams = cControls.getVideoStreams(); //combine local video streams with audio streams streams.push.apply(streams, cControls.getAudioStreams()); |
Add each stream to local display (so we can see it on page) and peer connection
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//add our local streams to the room (to PeerConnection) streams.forEach(function (s) { //add local stream to local display localDisplay.add(s.stream.id, "local", s.stream); //add each track to PeerConnection s.stream.getTracks().forEach((track) => { addTrackToPeerConnection(pc, s.stream, track, s.encodings); if (s.source subscribeTrackToEndedEvent(room, track, pc); === "screen") { config[track.id] = s.source; }); }); |
Add listener to controls so we know if user adds new local streams. Once we have a new stream we will need to add it to local display, add it to peer connection and kickoff renegotiation
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//add callback for the new local stream to the local controls cControls.onTrack(function (s addTrackToPeerConnection(pc, s.stream, track, s.encodings); subscribeTrackToEndedEvent(room, track, pc); }); }); |
Add listener to controls so we know if user adds new local streams. Once we have a new stream we will need to add it to local display, add it to peer connection and kickoff renegotiation
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//add callback for the new local stream to the local controls cControls.onTrack(function (s) { let config = {}; //add local stream to local display localDisplay.add(s.stream.id, "local", s.stream); //add each track to PeerConnection s.stream.getTracks().forEach((track) => { if (s.source === "screen") { //add local stream to local display localDisplay.add(s.streamconfig[track.id, "local",] = s.stream)source; //add each track to PeerConnection} s.stream.getTracks().forEach((track) => { addTrackToPeerConnection(pc, s.stream, track, s.encodings); subscribeTrackToEndedEvent(room, track, pc); }); //kickoff renegotiation room.updateState(config); }); |
Finally join WebRTC negotiation in the room
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//join room room.join(pc, null, config); |
6. Finalizing local track
subscribeTrackToEndedEvent() code
This is a helper function that subscribes new local track to "ended" event. Once event fired we remove track from peer connection and kickoff renegotiation.
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addTrackToPeerConnection() code
This is a helper function which adds new local track to peer connection.
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