webRTC订单和信令服务器

时间:2016-09-17 14:24:16

标签: node.js sockets socket.io webrtc peer

所以我试图通过socket.io的信令服务器建立webRTC视频连接。我已经过了setLocalDescription,这让我可以得到冰候选人,我相信从阅读是正确的方法,但我如何添加冰候选人。我看到我必须使用类似下面的内容:myPeerConnection.addIceCandidate(RTCIceCandidate);但是我是否将其添加到远程和本地对等连接中?我是否将evt.candidates发送到我的信令服务器并将其添加到那里?如果是这样,怎么样?添加到对等连接的变量不是全局的。我已经在这几天工作了,我想我现在只需要一个指南,比在线教程更好的东西,我已经看了我能做的一切找到。

这是附加到我的html:client.js

的代码
var socket = io.connect();

var myPeerConnection;
var remotePeerConnection;
var offer;

var PeerConnectionWindow = (window.RTCPeerConnection || window.mozRTCPeerConnection 
|| window.webkitRTCPeerConnection || window.msRTCPeerConnection);
var SessionDescription = (window.RTCSessionDescription || window.mozRTCSessionDescription 
|| window.webkitRTCSessionDescription || window.msRTCSessionDescription);


    function hasUserMedia() { 
   //check if the browser supports the WebRTC 
   return !!(navigator.getUserMedia || navigator.webkitGetUserMedia || 
      navigator.mozGetUserMedia || navigator.msGetUserMedia); 
}




if (hasUserMedia()) {

   var configuration = { 
      "iceServers": [{ "url": "stun:stun.1.google.com:19302" }] 
   }; 

   myPeerConnection = new PeerConnectionWindow(configuration);
   console.log(myPeerConnection);

   remotePeerConnection = new PeerConnectionWindow(configuration);
   console.log(remotePeerConnection);

   myPeerConnection.createOffer(gotDescription, onError);

   myPeerConnection.onicecandidate = function(evt){
      if(event.candidate){
         socket.emit('ice', JSON.stringify({'ice': evt.candidate}));
         remotePeerConnection.addIceCandidate(evt.candidate);
         console.log("connected my to remote");
      }
   };

   remotePeerConnection.onicecandidate = function(evt){
      if(event.candidate){
         socket.emit('ice', JSON.stringify({'ice': evt.candidate}));
         myPeerConnection.addIceCandidate(evt.candidate);
         console.log("connected my to remote");
      }
   };

   remotePeerConnection.onaddstream = function (evt) {
      console.log("on added stream");
      var remoteVid = document.getElementById('remote'); 

      remoteVid.src = window.URL.createObjectURL(evt.stream);
   }

   navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia
   || navigator.mozGetUserMedia || navigator.msGetUserMedia; 
   //enabling video and audio channels 
   navigator.getUserMedia({ video: true, audio: true }, function (stream) {  
      var video = document.getElementById('local');  
      // //inserting our stream to the video tag     
      video.src = window.URL.createObjectURL(stream);
      myPeerConnection.addStream(stream); 
   }, onError); 
} else { 
   alert("WebRTC is not supported"); 
}

function gotDescription(desc) {
   offer = desc
   myPeerConnection.setLocalDescription(offer, myPeerConnLocalDescSet, onError);
   socket.emit('description', JSON.stringify({'sdp': desc}));
}

function onError(err){
   console.log(err);
}

function myPeerConnLocalDescSet(){
   remotePeerConnection.setRemoteDescription(offer, remotePeerConnRemoteDescSet,onError);
}

function remotePeerConnRemoteDescSet(){
   remotePeerConnection.createAnswer(onAnswerCreated, onError);
}

function onAnswerCreated(description){
   answer = description;
   remotePeerConnection.setLocalDescription(answer, remotePeerLocalDescSet,onError);
}

function remotePeerLocalDescSet(){
   myPeerConnection.setRemoteDescription(answer, myPeerRemoteDescSet,onError);
}

function myPeerRemoteDescSet(){
   console.log('did we get it?');
}

这是我的信令服务器:server.js

var express = require('express');
var app = express();
var server = require('http').createServer(app);
var io = require('socket.io').listen(server);



app.get('/', function(req, res){
   res.sendFile(__dirname + '/index.html');
});

app.use(express.static(__dirname + '/'));

server.listen(process.env.PORT || 3000, function(){
  console.log('listening on *:3000');
});


io.sockets.on('connection', function(socket){
    console.log("in the socket on server");

    socket.on('disconnect', function(){
        console.log('user disconnected');
    });
    socket.on('description', function(data){
        console.log(data);
    });
    socket.on('ice', function(data){
        // Do I attempt to add the candidate here like so?: myPeerConnection.addIceCandidate(new RTCIceCandidate(data));
    });
});

更新

所以看起来所有东西都按顺序流动,所以我更新了我的代码。现在我只需要帮助知道如何在两个对等体之间交换SDP信息。我现在拥有的是他们被送到Socket.io被双方接收和申请......对吗?有人有一些示例代码,说明如何完成它们可以向我显示解释。拜托,谢谢你的帮助!

2 个答案:

答案 0 :(得分:1)

所以我发现如何通过一些基本教程与socket.io进行通信,如果有人感兴趣,但最重要的是我发现webrtc的顺序非常重要。在拥有正确的代码并且呼叫之后,对等仍然没有完成,因为 ONADDSTREAM在您创建提议之前已经在本地远程和ADDSTREAM上被调用

对于那些在这么简单的事情上浪费了几个小时的人来说。

答案 1 :(得分:0)

首先实现总是很棘手,ICE候选接口(添加和打开)确实非常混乱。您可以查看该图表,以了解何时调用哪个事件以及应该使用哪个API。您可以看到,当本地创建候选项(onIceCandidate事件)时,需要通过信令将其传递到远程端,并使用addIceCandidate API添加。由于它是对称的,onIceCandidate总是提供本地候选者,addIceCandidate总是将远程候选者作为参数。

http://www.slideshare.net/alexpiwi5/overviewpeerconnectionlifetime