var WebRtcStreamer = (function() {
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/**
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* Interface with WebRTC-streamer API
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* @constructor
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* @param {string} videoElement - id of the video element tag
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* @param {string} srvurl - url of webrtc-streamer (default is current location)
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*/
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var WebRtcStreamer = function WebRtcStreamer (videoElement, srvurl) {
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if (typeof videoElement === "string") {
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this.videoElement = document.getElementById(videoElement);
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} else {
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this.videoElement = videoElement;
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}
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this.srvurl = srvurl || location.protocol+"//"+window.location.hostname+":"+window.location.port;
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this.pc = null;
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this.mediaConstraints = { offerToReceiveAudio: true, offerToReceiveVideo: true };
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this.iceServers = null;
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this.earlyCandidates = [];
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}
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WebRtcStreamer.prototype._handleHttpErrors = function (response) {
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if (!response.ok) {
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throw Error(response.statusText);
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}
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return response;
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}
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/**
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* Connect a WebRTC Stream to videoElement
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* @param {string} videourl - id of WebRTC video stream
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* @param {string} audiourl - id of WebRTC audio stream
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* @param {string} options - options of WebRTC call
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* @param {string} stream - local stream to send
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* @param {string} prefmime - prefered mime
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*/
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WebRtcStreamer.prototype.connect = function(videourl, audiourl, options, localstream, prefmime) {
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this.disconnect();
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// getIceServers is not already received
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if (!this.iceServers) {
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console.log("Get IceServers");
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fetch(this.srvurl + "/api/getIceServers")
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.then(this._handleHttpErrors)
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.then( (response) => (response.json()) )
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.then( (response) => this.onReceiveGetIceServers(response, videourl, audiourl, options, localstream, prefmime))
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.catch( (error) => this.onError("getIceServers " + error ))
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} else {
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this.onReceiveGetIceServers(this.iceServers, videourl, audiourl, options, localstream, prefmime);
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}
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}
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/**
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* Disconnect a WebRTC Stream and clear videoElement source
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*/
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WebRtcStreamer.prototype.disconnect = function() {
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if (this.videoElement?.srcObject) {
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this.videoElement.srcObject.getTracks().forEach(track => {
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track.stop()
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this.videoElement.srcObject.removeTrack(track);
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});
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}
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if (this.pc) {
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fetch(this.srvurl + "/api/hangup?peerid=" + this.pc.peerid)
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.then(this._handleHttpErrors)
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.catch( (error) => this.onError("hangup " + error ))
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try {
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this.pc.close();
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}
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catch (e) {
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console.log ("Failure close peer connection:" + e);
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}
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this.pc = null;
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}
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}
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WebRtcStreamer.prototype.filterPreferredCodec = function(sdp, prefmime) {
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const lines = sdp.split('\n');
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const [prefkind, prefcodec] = prefmime.toLowerCase().split('/');
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let currentMediaType = null;
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let sdpSections = [];
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let currentSection = [];
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// Group lines into sections
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lines.forEach(line => {
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if (line.startsWith('m=')) {
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if (currentSection.length) {
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sdpSections.push(currentSection);
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}
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currentSection = [line];
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} else {
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currentSection.push(line);
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}
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});
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sdpSections.push(currentSection);
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// Process each section
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const processedSections = sdpSections.map(section => {
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const firstLine = section[0];
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if (!firstLine.startsWith('m=' + prefkind)) {
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return section.join('\n');
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}
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// Get payload types for preferred codec
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const rtpLines = section.filter(line => line.startsWith('a=rtpmap:'));
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const preferredPayloads = rtpLines
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.filter(line => line.toLowerCase().includes(prefcodec))
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.map(line => line.split(':')[1].split(' ')[0]);
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if (preferredPayloads.length === 0) {
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return section.join('\n');
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}
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// Modify m= line to only include preferred payloads
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const mLine = firstLine.split(' ');
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const newMLine = [...mLine.slice(0,3), ...preferredPayloads].join(' ');
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// Filter related attributes
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const filteredLines = section.filter(line => {
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if (line === firstLine) return false;
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if (line.startsWith('a=rtpmap:')) {
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return preferredPayloads.some(payload => line.startsWith(`a=rtpmap:${payload}`));
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}
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if (line.startsWith('a=fmtp:') || line.startsWith('a=rtcp-fb:')) {
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return preferredPayloads.some(payload => line.startsWith(`a=${line.split(':')[0].split('a=')[1]}:${payload}`));
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}
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return true;
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});
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return [newMLine, ...filteredLines].join('\n');
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});
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return processedSections.join('\n');
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}
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/*
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* GetIceServers callback
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*/
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WebRtcStreamer.prototype.onReceiveGetIceServers = function(iceServers, videourl, audiourl, options, stream, prefmime) {
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this.iceServers = iceServers;
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this.pcConfig = iceServers || {"iceServers": [] };
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try {
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this.createPeerConnection();
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let callurl = this.srvurl + "/api/call?peerid=" + this.pc.peerid + "&url=" + encodeURIComponent(videourl);
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if (audiourl) {
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callurl += "&audiourl="+encodeURIComponent(audiourl);
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}
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if (options) {
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callurl += "&options="+encodeURIComponent(options);
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}
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if (stream) {
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this.pc.addStream(stream);
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}
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// clear early candidates
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this.earlyCandidates.length = 0;
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// create Offer
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this.pc.createOffer(this.mediaConstraints).then((sessionDescription) => {
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console.log("Create offer:" + JSON.stringify(sessionDescription));
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console.log(`video codecs:${Array.from(new Set(RTCRtpReceiver.getCapabilities("video")?.codecs?.map(codec => codec.mimeType)))}`)
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console.log(`audio codecs:${Array.from(new Set(RTCRtpReceiver.getCapabilities("audio")?.codecs?.map(codec => codec.mimeType)))}`)
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if (prefmime != undefined) {
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//set prefered codec
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let [prefkind] = prefmime.split('/');
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if (prefkind != "video" && prefkind != "audio") {
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prefkind = "video";
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prefmime = prefkind + "/" + prefmime;
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}
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console.log("sdp:" + sessionDescription.sdp);
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sessionDescription.sdp = this.filterPreferredCodec(sessionDescription.sdp, prefmime);
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console.log("sdp:" + sessionDescription.sdp);
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}
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this.pc.setLocalDescription(sessionDescription)
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.then(() => {
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fetch(callurl, { method: "POST", body: JSON.stringify(sessionDescription) })
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.then(this._handleHttpErrors)
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.then( (response) => (response.json()) )
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.catch( (error) => this.onError("call " + error ))
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.then( (response) => this.onReceiveCall(response) )
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.catch( (error) => this.onError("call " + error ))
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}, (error) => {
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console.log ("setLocalDescription error:" + JSON.stringify(error));
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});
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}, (error) => {
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alert("Create offer error:" + JSON.stringify(error));
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});
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} catch (e) {
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this.disconnect();
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alert("connect error: " + e);
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}
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}
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WebRtcStreamer.prototype.getIceCandidate = function() {
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fetch(this.srvurl + "/api/getIceCandidate?peerid=" + this.pc.peerid)
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.then(this._handleHttpErrors)
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.then( (response) => (response.json()) )
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.then( (response) => this.onReceiveCandidate(response))
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.catch( (error) => this.onError("getIceCandidate " + error ))
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}
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/*
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* create RTCPeerConnection
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*/
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WebRtcStreamer.prototype.createPeerConnection = function() {
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console.log("createPeerConnection config: " + JSON.stringify(this.pcConfig));
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this.pc = new RTCPeerConnection(this.pcConfig);
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let pc = this.pc;
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pc.peerid = Math.random();
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pc.onicecandidate = (evt) => this.onIceCandidate(evt);
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pc.onaddstream = (evt) => this.onAddStream(evt);
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pc.oniceconnectionstatechange = (evt) => {
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console.log("oniceconnectionstatechange state: " + pc.iceConnectionState);
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if (this.videoElement) {
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if (pc.iceConnectionState === "connected") {
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this.videoElement.style.opacity = "1.0";
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}
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else if (pc.iceConnectionState === "disconnected") {
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this.videoElement.style.opacity = "0.25";
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}
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else if ( (pc.iceConnectionState === "failed") || (pc.iceConnectionState === "closed") ) {
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this.videoElement.style.opacity = "0.5";
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} else if (pc.iceConnectionState === "new") {
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this.getIceCandidate();
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}
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}
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}
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pc.ondatachannel = function(evt) {
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console.log("remote datachannel created:"+JSON.stringify(evt));
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evt.channel.onopen = function () {
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console.log("remote datachannel open");
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this.send("remote channel openned");
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}
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evt.channel.onmessage = function (event) {
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console.log("remote datachannel recv:"+JSON.stringify(event.data));
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}
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}
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try {
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let dataChannel = pc.createDataChannel("ClientDataChannel");
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dataChannel.onopen = function() {
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console.log("local datachannel open");
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this.send("local channel openned");
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}
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dataChannel.onmessage = function(evt) {
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console.log("local datachannel recv:"+JSON.stringify(evt.data));
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}
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} catch (e) {
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console.log("Cannor create datachannel error: " + e);
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}
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console.log("Created RTCPeerConnnection with config: " + JSON.stringify(this.pcConfig) );
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return pc;
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}
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/*
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* RTCPeerConnection IceCandidate callback
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*/
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WebRtcStreamer.prototype.onIceCandidate = function (event) {
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if (event.candidate) {
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if (this.pc.currentRemoteDescription) {
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this.addIceCandidate(this.pc.peerid, event.candidate);
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} else {
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this.earlyCandidates.push(event.candidate);
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}
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}
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else {
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console.log("End of candidates.");
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}
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}
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WebRtcStreamer.prototype.addIceCandidate = function(peerid, candidate) {
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fetch(this.srvurl + "/api/addIceCandidate?peerid="+peerid, { method: "POST", body: JSON.stringify(candidate) })
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.then(this._handleHttpErrors)
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.then( (response) => (response.json()) )
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.then( (response) => {console.log("addIceCandidate ok:" + response)})
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.catch( (error) => this.onError("addIceCandidate " + error ))
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}
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/*
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* RTCPeerConnection AddTrack callback
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*/
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WebRtcStreamer.prototype.onAddStream = function(event) {
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console.log("Remote track added:" + JSON.stringify(event));
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this.videoElement.srcObject = event.stream;
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let promise = this.videoElement.play();
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if (promise !== undefined) {
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promise.catch((error) => {
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console.warn("error:"+error);
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this.videoElement.setAttribute("controls", true);
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});
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}
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}
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/*
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* AJAX /call callback
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*/
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WebRtcStreamer.prototype.onReceiveCall = function(dataJson) {
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console.log("offer: " + JSON.stringify(dataJson));
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let descr = new RTCSessionDescription(dataJson);
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this.pc.setRemoteDescription(descr).then(() => {
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console.log ("setRemoteDescription ok");
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while (this.earlyCandidates.length) {
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let candidate = this.earlyCandidates.shift();
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this.addIceCandidate(this.pc.peerid, candidate);
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}
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this.getIceCandidate()
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}
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, (error) => {
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console.log ("setRemoteDescription error:" + JSON.stringify(error));
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});
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}
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/*
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* AJAX /getIceCandidate callback
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*/
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WebRtcStreamer.prototype.onReceiveCandidate = function(dataJson) {
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console.log("candidate: " + JSON.stringify(dataJson));
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if (dataJson) {
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for (let i=0; i<dataJson.length; i++) {
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let candidate = new RTCIceCandidate(dataJson[i]);
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console.log("Adding ICE candidate :" + JSON.stringify(candidate) );
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this.pc.addIceCandidate(candidate).then( () => { console.log ("addIceCandidate OK"); }
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, (error) => { console.log ("addIceCandidate error:" + JSON.stringify(error)); } );
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}
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this.pc.addIceCandidate();
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}
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}
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/*
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* AJAX callback for Error
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*/
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WebRtcStreamer.prototype.onError = function(status) {
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console.log("onError:" + status);
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}
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return WebRtcStreamer;
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})();
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if (typeof window !== 'undefined' && typeof window.document !== 'undefined') {
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window.WebRtcStreamer = WebRtcStreamer;
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}
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if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
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module.exports = WebRtcStreamer;
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}
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