From 4b2e902503ac1fabde7340ca26a1adbc0018d118 Mon Sep 17 00:00:00 2001
From: 艺术家 <10819716+q100102@user.noreply.gitee.com>
Date: 星期三, 11 六月 2025 17:31:41 +0800
Subject: [PATCH] 代码提交
---
项目代码/伸缩杆/client/public/webrtcstreamer.js | 370 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 370 insertions(+), 0 deletions(-)
diff --git "a/\351\241\271\347\233\256\344\273\243\347\240\201/\344\274\270\347\274\251\346\235\206/client/public/webrtcstreamer.js" "b/\351\241\271\347\233\256\344\273\243\347\240\201/\344\274\270\347\274\251\346\235\206/client/public/webrtcstreamer.js"
new file mode 100644
index 0000000..8dd9160
--- /dev/null
+++ "b/\351\241\271\347\233\256\344\273\243\347\240\201/\344\274\270\347\274\251\346\235\206/client/public/webrtcstreamer.js"
@@ -0,0 +1,370 @@
+var WebRtcStreamer = (function() {
+
+/**
+ * Interface with WebRTC-streamer API
+ * @constructor
+ * @param {string} videoElement - id of the video element tag
+ * @param {string} srvurl - url of webrtc-streamer (default is current location)
+*/
+var WebRtcStreamer = function WebRtcStreamer (videoElement, srvurl) {
+ if (typeof videoElement === "string") {
+ this.videoElement = document.getElementById(videoElement);
+ } else {
+ this.videoElement = videoElement;
+ }
+ this.srvurl = srvurl || location.protocol+"//"+window.location.hostname+":"+window.location.port;
+ this.pc = null;
+
+ this.mediaConstraints = { offerToReceiveAudio: true, offerToReceiveVideo: true };
+
+ this.iceServers = null;
+ this.earlyCandidates = [];
+}
+
+WebRtcStreamer.prototype._handleHttpErrors = function (response) {
+ if (!response.ok) {
+ throw Error(response.statusText);
+ }
+ return response;
+}
+
+/**
+ * Connect a WebRTC Stream to videoElement
+ * @param {string} videourl - id of WebRTC video stream
+ * @param {string} audiourl - id of WebRTC audio stream
+ * @param {string} options - options of WebRTC call
+ * @param {string} stream - local stream to send
+ * @param {string} prefmime - prefered mime
+*/
+WebRtcStreamer.prototype.connect = function(videourl, audiourl, options, localstream, prefmime) {
+ this.disconnect();
+
+ // getIceServers is not already received
+ if (!this.iceServers) {
+ console.log("Get IceServers");
+
+ fetch(this.srvurl + "/api/getIceServers")
+ .then(this._handleHttpErrors)
+ .then( (response) => (response.json()) )
+ .then( (response) => this.onReceiveGetIceServers(response, videourl, audiourl, options, localstream, prefmime))
+ .catch( (error) => this.onError("getIceServers " + error ))
+
+ } else {
+ this.onReceiveGetIceServers(this.iceServers, videourl, audiourl, options, localstream, prefmime);
+ }
+}
+
+/**
+ * Disconnect a WebRTC Stream and clear videoElement source
+*/
+WebRtcStreamer.prototype.disconnect = function() {
+ if (this.videoElement?.srcObject) {
+ this.videoElement.srcObject.getTracks().forEach(track => {
+ track.stop()
+ this.videoElement.srcObject.removeTrack(track);
+ });
+ }
+ if (this.pc) {
+ fetch(this.srvurl + "/api/hangup?peerid=" + this.pc.peerid)
+ .then(this._handleHttpErrors)
+ .catch( (error) => this.onError("hangup " + error ))
+
+
+ try {
+ this.pc.close();
+ }
+ catch (e) {
+ console.log ("Failure close peer connection:" + e);
+ }
+ this.pc = null;
+ }
+}
+
+WebRtcStreamer.prototype.filterPreferredCodec = function(sdp, prefmime) {
+ const lines = sdp.split('\n');
+ const [prefkind, prefcodec] = prefmime.toLowerCase().split('/');
+ let currentMediaType = null;
+ let sdpSections = [];
+ let currentSection = [];
+
+ // Group lines into sections
+ lines.forEach(line => {
+ if (line.startsWith('m=')) {
+ if (currentSection.length) {
+ sdpSections.push(currentSection);
+ }
+ currentSection = [line];
+ } else {
+ currentSection.push(line);
+ }
+ });
+ sdpSections.push(currentSection);
+
+ // Process each section
+ const processedSections = sdpSections.map(section => {
+ const firstLine = section[0];
+ if (!firstLine.startsWith('m=' + prefkind)) {
+ return section.join('\n');
+ }
+
+ // Get payload types for preferred codec
+ const rtpLines = section.filter(line => line.startsWith('a=rtpmap:'));
+ const preferredPayloads = rtpLines
+ .filter(line => line.toLowerCase().includes(prefcodec))
+ .map(line => line.split(':')[1].split(' ')[0]);
+
+ if (preferredPayloads.length === 0) {
+ return section.join('\n');
+ }
+
+ // Modify m= line to only include preferred payloads
+ const mLine = firstLine.split(' ');
+ const newMLine = [...mLine.slice(0,3), ...preferredPayloads].join(' ');
+
+ // Filter related attributes
+ const filteredLines = section.filter(line => {
+ if (line === firstLine) return false;
+ if (line.startsWith('a=rtpmap:')) {
+ return preferredPayloads.some(payload => line.startsWith(`a=rtpmap:${payload}`));
+ }
+ if (line.startsWith('a=fmtp:') || line.startsWith('a=rtcp-fb:')) {
+ return preferredPayloads.some(payload => line.startsWith(`a=${line.split(':')[0].split('a=')[1]}:${payload}`));
+ }
+ return true;
+ });
+
+ return [newMLine, ...filteredLines].join('\n');
+ });
+
+ return processedSections.join('\n');
+}
+
+/*
+* GetIceServers callback
+*/
+WebRtcStreamer.prototype.onReceiveGetIceServers = function(iceServers, videourl, audiourl, options, stream, prefmime) {
+ this.iceServers = iceServers;
+ this.pcConfig = iceServers || {"iceServers": [] };
+ try {
+ this.createPeerConnection();
+
+ let callurl = this.srvurl + "/api/call?peerid=" + this.pc.peerid + "&url=" + encodeURIComponent(videourl);
+ if (audiourl) {
+ callurl += "&audiourl="+encodeURIComponent(audiourl);
+ }
+ if (options) {
+ callurl += "&options="+encodeURIComponent(options);
+ }
+
+ if (stream) {
+ this.pc.addStream(stream);
+ }
+
+ // clear early candidates
+ this.earlyCandidates.length = 0;
+
+ // create Offer
+ this.pc.createOffer(this.mediaConstraints).then((sessionDescription) => {
+ console.log("Create offer:" + JSON.stringify(sessionDescription));
+
+ console.log(`video codecs:${Array.from(new Set(RTCRtpReceiver.getCapabilities("video")?.codecs?.map(codec => codec.mimeType)))}`)
+ console.log(`audio codecs:${Array.from(new Set(RTCRtpReceiver.getCapabilities("audio")?.codecs?.map(codec => codec.mimeType)))}`)
+
+ if (prefmime != undefined) {
+ //set prefered codec
+ let [prefkind] = prefmime.split('/');
+ if (prefkind != "video" && prefkind != "audio") {
+ prefkind = "video";
+ prefmime = prefkind + "/" + prefmime;
+ }
+ console.log("sdp:" + sessionDescription.sdp);
+ sessionDescription.sdp = this.filterPreferredCodec(sessionDescription.sdp, prefmime);
+ console.log("sdp:" + sessionDescription.sdp);
+ }
+
+
+ this.pc.setLocalDescription(sessionDescription)
+ .then(() => {
+ fetch(callurl, { method: "POST", body: JSON.stringify(sessionDescription) })
+ .then(this._handleHttpErrors)
+ .then( (response) => (response.json()) )
+ .catch( (error) => this.onError("call " + error ))
+ .then( (response) => this.onReceiveCall(response) )
+ .catch( (error) => this.onError("call " + error ))
+
+ }, (error) => {
+ console.log ("setLocalDescription error:" + JSON.stringify(error));
+ });
+
+ }, (error) => {
+ alert("Create offer error:" + JSON.stringify(error));
+ });
+
+ } catch (e) {
+ this.disconnect();
+ alert("connect error: " + e);
+ }
+}
+
+
+WebRtcStreamer.prototype.getIceCandidate = function() {
+ fetch(this.srvurl + "/api/getIceCandidate?peerid=" + this.pc.peerid)
+ .then(this._handleHttpErrors)
+ .then( (response) => (response.json()) )
+ .then( (response) => this.onReceiveCandidate(response))
+ .catch( (error) => this.onError("getIceCandidate " + error ))
+}
+
+/*
+* create RTCPeerConnection
+*/
+WebRtcStreamer.prototype.createPeerConnection = function() {
+ console.log("createPeerConnection config: " + JSON.stringify(this.pcConfig));
+ this.pc = new RTCPeerConnection(this.pcConfig);
+ let pc = this.pc;
+ pc.peerid = Math.random();
+
+ pc.onicecandidate = (evt) => this.onIceCandidate(evt);
+ pc.onaddstream = (evt) => this.onAddStream(evt);
+ pc.oniceconnectionstatechange = (evt) => {
+ console.log("oniceconnectionstatechange state: " + pc.iceConnectionState);
+ if (this.videoElement) {
+ if (pc.iceConnectionState === "connected") {
+ this.videoElement.style.opacity = "1.0";
+ }
+ else if (pc.iceConnectionState === "disconnected") {
+ this.videoElement.style.opacity = "0.25";
+ }
+ else if ( (pc.iceConnectionState === "failed") || (pc.iceConnectionState === "closed") ) {
+ this.videoElement.style.opacity = "0.5";
+ } else if (pc.iceConnectionState === "new") {
+ this.getIceCandidate();
+ }
+ }
+ }
+ pc.ondatachannel = function(evt) {
+ console.log("remote datachannel created:"+JSON.stringify(evt));
+
+ evt.channel.onopen = function () {
+ console.log("remote datachannel open");
+ this.send("remote channel openned");
+ }
+ evt.channel.onmessage = function (event) {
+ console.log("remote datachannel recv:"+JSON.stringify(event.data));
+ }
+ }
+
+ try {
+ let dataChannel = pc.createDataChannel("ClientDataChannel");
+ dataChannel.onopen = function() {
+ console.log("local datachannel open");
+ this.send("local channel openned");
+ }
+ dataChannel.onmessage = function(evt) {
+ console.log("local datachannel recv:"+JSON.stringify(evt.data));
+ }
+ } catch (e) {
+ console.log("Cannor create datachannel error: " + e);
+ }
+
+ console.log("Created RTCPeerConnnection with config: " + JSON.stringify(this.pcConfig) );
+ return pc;
+}
+
+
+/*
+* RTCPeerConnection IceCandidate callback
+*/
+WebRtcStreamer.prototype.onIceCandidate = function (event) {
+ if (event.candidate) {
+ if (this.pc.currentRemoteDescription) {
+ this.addIceCandidate(this.pc.peerid, event.candidate);
+ } else {
+ this.earlyCandidates.push(event.candidate);
+ }
+ }
+ else {
+ console.log("End of candidates.");
+ }
+}
+
+
+WebRtcStreamer.prototype.addIceCandidate = function(peerid, candidate) {
+ fetch(this.srvurl + "/api/addIceCandidate?peerid="+peerid, { method: "POST", body: JSON.stringify(candidate) })
+ .then(this._handleHttpErrors)
+ .then( (response) => (response.json()) )
+ .then( (response) => {console.log("addIceCandidate ok:" + response)})
+ .catch( (error) => this.onError("addIceCandidate " + error ))
+}
+
+/*
+* RTCPeerConnection AddTrack callback
+*/
+WebRtcStreamer.prototype.onAddStream = function(event) {
+ console.log("Remote track added:" + JSON.stringify(event));
+
+ this.videoElement.srcObject = event.stream;
+ let promise = this.videoElement.play();
+ if (promise !== undefined) {
+ promise.catch((error) => {
+ console.warn("error:"+error);
+ this.videoElement.setAttribute("controls", true);
+ });
+ }
+}
+
+/*
+* AJAX /call callback
+*/
+WebRtcStreamer.prototype.onReceiveCall = function(dataJson) {
+
+ console.log("offer: " + JSON.stringify(dataJson));
+ let descr = new RTCSessionDescription(dataJson);
+ this.pc.setRemoteDescription(descr).then(() => {
+ console.log ("setRemoteDescription ok");
+ while (this.earlyCandidates.length) {
+ let candidate = this.earlyCandidates.shift();
+ this.addIceCandidate(this.pc.peerid, candidate);
+ }
+
+ this.getIceCandidate()
+ }
+ , (error) => {
+ console.log ("setRemoteDescription error:" + JSON.stringify(error));
+ });
+}
+
+/*
+* AJAX /getIceCandidate callback
+*/
+WebRtcStreamer.prototype.onReceiveCandidate = function(dataJson) {
+ console.log("candidate: " + JSON.stringify(dataJson));
+ if (dataJson) {
+ for (let i=0; i<dataJson.length; i++) {
+ let candidate = new RTCIceCandidate(dataJson[i]);
+
+ console.log("Adding ICE candidate :" + JSON.stringify(candidate) );
+ this.pc.addIceCandidate(candidate).then( () => { console.log ("addIceCandidate OK"); }
+ , (error) => { console.log ("addIceCandidate error:" + JSON.stringify(error)); } );
+ }
+ this.pc.addIceCandidate();
+ }
+}
+
+
+/*
+* AJAX callback for Error
+*/
+WebRtcStreamer.prototype.onError = function(status) {
+ console.log("onError:" + status);
+}
+
+return WebRtcStreamer;
+})();
+
+if (typeof window !== 'undefined' && typeof window.document !== 'undefined') {
+ window.WebRtcStreamer = WebRtcStreamer;
+}
+if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
+ module.exports = WebRtcStreamer;
+}
--
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