webrtc学习笔记五(视频流和datachannel一起使用的例子)
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2022-07-08 16:45:09
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2020年5月9日更新,5年前的例子运行不了了,更新下html
主要是chrome的URL的api变了
在mac的chrome上
把 document.getElementById('remoteVideo').src = window.URL.createObjectURL(event.stream);
改成
document.getElementById('remoteVideo').srcObject = event.stream;
参考:https://*.com/questions/27120757/failed-to-execute-createobjecturl-on-url
视频和datachannel一起使用的两个页面的例子
网上的datachannel只能在一个页面,
根据视频的改了下两个页面可以传数据了
疑问:ondatachannel似乎没用上
先打开192.168.137.27:8081/js/webrtc2.html
另一台电脑打开
192.168.137.27:8081/js/webrtc2.html#true
视频正确两个都显示了才正确,
websocket三个页面有问题,没优化
server.js
webrtc2.html
主要是chrome的URL的api变了
在mac的chrome上
把 document.getElementById('remoteVideo').src = window.URL.createObjectURL(event.stream);
改成
document.getElementById('remoteVideo').srcObject = event.stream;
参考:https://*.com/questions/27120757/failed-to-execute-createobjecturl-on-url
视频和datachannel一起使用的两个页面的例子
网上的datachannel只能在一个页面,
根据视频的改了下两个页面可以传数据了
疑问:ondatachannel似乎没用上
先打开192.168.137.27:8081/js/webrtc2.html
另一台电脑打开
192.168.137.27:8081/js/webrtc2.html#true
视频正确两个都显示了才正确,
websocket三个页面有问题,没优化
server.js
//http://www.blogjava.net/linli/archive/2014/10/21/418910.html var express = require('express'), app = express(), server = require('http').createServer(app); server.listen(3000); app.get('/', function(req, res) { res.sendfile(__dirname + '/webrtc.html'); }); var WebSocketServer = require('ws').Server, wss = new WebSocketServer({server: server}); function writeObj(obj){ var description = ""; for(var i in obj){ var property=obj[i]; description+=i+" = "+property+"\n"; } console.log(description); } // 存储socket的数组,这里只能有2个socket,每次测试需要重启,否则会出错 var wsc = [], index = 1; // 有socket连入 wss.on('connection', function(ws) { console.log('connection:'); //writeObj(ws); // 将socket存入数组 wsc.push(ws); // 记下对方socket在数组中的下标,因为这个测试程序只允许2个socket // 所以第一个连入的socket存入0,第二个连入的就是存入1 // otherIndex就反着来,第一个socket的otherIndex下标为1,第二个socket的otherIndex下标为0 var otherIndex = index--, desc = null; if (otherIndex == 1) { desc = 'first socket'; } else { desc = 'second socket'; } // 转发收到的消息 ws.on('message', function(message) { var json = JSON.parse(message); //console.log('received (' + desc + '): ', json); console.log('otherIndex ---('+desc+')(' + otherIndex + '): '+json.event); wsc[otherIndex].send(message, function (error) { if (error) { console.log('Send message error (' + desc + '): ', error); } }); }); });
webrtc2.html
<html> <body> <button id="sendButton" onclick="sendData()">Send</button> <textarea id="dataChannelSend" >abc</textarea> <textarea id="dataChannelReceive" ></textarea> Local: <br> <video id="localVideo" autoplay></video><br> Remote: <br> <video id="remoteVideo" autoplay></video> <script> function writeObj(obj){ var description = ""; for(var i in obj){ var property=obj[i]; description+=i+" = "+property+"\n"; } console.log(description); } var isCaller = window.location.href.split('#')[1]; var socket = new WebSocket("ws://192.168.137.27:3000"); socket.onmessage = function(event){ var json = JSON.parse(event.data); //console.log('onmessage: ', json); //如果是一个ICE的候选,则将其加入到PeerConnection中,否则设定对方的session描述为传递过来的描述 if( json.event === "_ice_candidate" ){ // console.log("_ice_candidate:---->"); // writeObj(json.data.candidate); pc.addIceCandidate(new RTCIceCandidate(json.data.candidate)); } else { // console.log("not _ice_candidate:---->"); // writeObj(json.data.sdp); pc.setRemoteDescription(new RTCSessionDescription(json.data.sdp)); console.log("---------------->pc.setRemote"); // 如果是一个offer,那么需要回复一个answer if(json.event === "_offer") { console.log("------->createAnswer"); pc.createAnswer(function(desc){ pc.setLocalDescription(desc); console.log("---------------->pc.setLocal"); socket.send(JSON.stringify({ "event": "_answer", "data": { "sdp": desc } })); }, function (error) { console.log('Failure callback: ' + error); }); }else{ console.log("------->receive Answer---('"+json.event+"')"); } } }; var iceServer = null; var pc = new webkitRTCPeerConnection(iceServer,{optional: [{RtpDataChannels: true}]}); try { sendChannel = pc.createDataChannel('sendDataChannel',{reliable: true}); } catch (e) { alert('createDataChannel() failed with exception: ' + e.message); } sendChannel.onopen = console.log('--Send channel open state is : ' +sendChannel.readyState); sendChannel.onclose = console.log('--Send channel close state is: ' +sendChannel.readyState); // 发送ICE候选到其他客户端 pc.onicecandidate = function(event){ console.log("onicecandidate----------->"); if (event.candidate !== null) { console.log("event.candidate != null"); socket.send(JSON.stringify({ "event": "_ice_candidate", "data": { "candidate": event.candidate } })); }else{ console.log("event.candidate == null"); } }; sendChannel.onmessage = function(event) { console.log("-sendChannel--★★★★★---ondatachannel"); document.getElementById('dataChannelReceive').value = event.data; }; /*pc.ondatachannel = function(event) { console.log("-receiveChannel--★★★★★---ondatachannel"); receiveChannel = event.channel; receiveChannel.onmessage = function(event) { document.getElementById('dataChannelReceive').value = event.data; }; receiveChannel.onopen = console.log('--Receive channel open state is: ' + receiveChannel.readyState);; receiveChannel.onclose = console.log('--Receive channel close state is: ' + receiveChannel.readyState);; };*/ // 如果检测到媒体流连接到本地,将其绑定到一个video标签上输出 pc.onaddstream = function(event){ //document.getElementById('remoteVideo').src = URL.createObjectURL(event.stream); document.getElementById('remoteVideo').srcObject = event.stream; }; function sendData() { var data = document.getElementById('dataChannelSend').value; console.log("---->>>>sendData():"+data); sendChannel.send(data); } navigator.webkitGetUserMedia({ "audio": true, "video": true }, function(stream){ // document.getElementById('localVideo').src = URL.createObjectURL(stream); document.getElementById('localVideo').srcObject = stream; pc.addStream(stream); if(isCaller){ console.log("------->createOffer"); pc.createOffer(function(desc){ // console.log(desc); pc.setLocalDescription(desc); console.log("---------------->pc.setLocal"); socket.send(JSON.stringify({ "event": "_offer", "data": { "sdp": desc } })); }, function (error) { console.log('Failure callback: ' + error); }); } }, function(error){ console.log('getUserMedia error: ' + error); }); </script> </body> </html>
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