Question

I am using google chrome 21.x on linux , webrtc peer connection gets established but am not able to receive any remote video stream, the callback given to the peerconnection “.onaddstream” never gets invoked, can some body advise where i need to look ?

I am pasting my entire code, still not able to receive the remote video stream, neither there are any errors.

var peerConnCreated = false;
var peerConn = null;
var cameraOn = false;
var clientId = 0;
var svcName = "";
var clientIdRecvd = false;
var myname = "";
var hisname = "";
var myJsep;
var hisJsep;
var mySdp;
var hisSdp;

function login()
{
    var loginid = document.getElementById("login").value;
    var jsonText = {"clientid":clientId, "service":"rtc", "mtype": "online", "username": loginid};
    myname = loginid;
    socket.send(JSON.stringify(jsonText));
}

function iceCallback(canditate, moreToFollow)
{
    if(canditate) {
        console.log("ice canditate");
        var jsonText = {"clientid":clientId, "service":"rtc", "mtype": "canditate", "sndr": myname, "rcpt": hisname, 
            "label": canditate.label, "cand": canditate.toSdp()};
        socket.send(JSON.stringify(jsonText));
    }
}

function onSessionConnecting(message)
{
    console.log("session connecting ...");
}

function onRemoteStreamRemoved(event)
{
    console.log("remote stream removed");
    remotevid.src = "";
}

function onSessionOpened(message)
{
    console.log("session opened");
}

function onRemoteStreamAdded(event)
{
    console.log("remote stream added");
    remotevid.src = window.webkitURL.createObjectURL(event.stream);
    remotevid.style.opacity = 1;
}

function createPeerConnection()
{
    if (peerConnCreated) return;
    peerConn = new webkitPeerConnection00("STUN stun.l.google.com:19302", iceCallback); 
    peerConn.onconnecting = onSessionConnecting;
    peerConn.onopen = onSessionOpened;
    peerConn.onaddstream = onRemoteStreamAdded;
    peerConn.onremovestream = onRemoteStreamRemoved;
    console.log("peer connection created");
    peerConnCreated = true;
}

function turnOnCameraAndMic()
{
    navigator.webkitGetUserMedia({video:true, audio:true}, successCallback, errorCallback);
    function successCallback(stream) {
        sourcevid.style.opacity = 1;
        sourcevid.src = window.webkitURL.createObjectURL(stream);
        peerConn.addStream(stream);
        console.log("local stream added");
    }
    function errorCallback(error) {
        console.error('An error occurred: [CODE ' + error.code + ']');
    }
    cameraOn = true;
}

function dialUser(user)
{
    if (!peerConnCreated) createPeerConnection();
    hisname = user;
    var localOffer = peerConn.createOffer({has_audio:true, has_video:true});
    peerConn.setLocalDescription(peerConn.SDP_OFFER, localOffer);
    mySdp =  peerConn.localDescription;
    myJsep = mySdp.toSdp();
    var call = {"clientid":clientId, "service":"rtc", "mtype": "call", "sndr": myname, "rcpt": hisname, "jsepdata": myJsep};
    socket.send(JSON.stringify(call));
    console.log("sent offer");
    //console.log(myJsep);
    peerConn.startIce();
    console.log("ice started ");
}

//handle the message from the sip server
//There is a new connection from our peer so turn on the camera 
//and relay the stream to peer.
function handleRtcMessage(request)
{
    var sessionRequest = eval('(' + request + ')');
    switch(sessionRequest.mtype) 
    {
        case 'online':
            console.log("new user online");
            var newuser = sessionRequest.username;
            var li = document.createElement("li");
            var name = document.createTextNode(newuser);
            li.appendChild(name);
            li.onclick = function() { dialUser(newuser); };
            document.getElementById("Contact List").appendChild(li);
            break;

        case 'call':
            console.log("recvng call");
            alert("Incoming call ...");
            if (!peerConnCreated) createPeerConnection();
            peerConn.setRemoteDescription(peerConn.SDP_OFFER, new SessionDescription(sessionRequest.jsepdata));
            hisname = sessionRequest.sndr;
            var remoteOffer = peerConn.remoteDescription;
            //console.log("remoteOffer" + remoteOffer.toSdp());
            var localAnswer = peerConn.createAnswer(remoteOffer.toSdp(), {has_audio:true, has_video:true}); 
            peerConn.setLocalDescription(peerConn.SDP_ANSWER, localAnswer);
            var jsonText = {"clientid":clientId,"service":"rtc", "mtype": "pickup", "sndr" :myname, "rcpt": hisname, "jsepdata": localAnswer.toSdp()};
            socket.send(JSON.stringify(jsonText));
            console.log("sent answer");
            //console.log(localAnswer.toSdp());
            peerConn.startIce();
            if (!cameraOn) turnOnCameraAndMic();
            break;

        case 'pickup':
            console.log("recvd pickup");
            peerConn.setRemoteDescription(peerConn.SDP_ANSWER, new SessionDescription(sessionRequest.jsepdata));
            hisname = sessionRequest.sndr;
            if (!cameraOn) turnOnCameraAndMic();
            break;

        case 'canditate':
            console.log("recvd canditate");
            var canditate = new IceCandidate(sessionRequest.label, sessionRequest.cand);
            peerConn.processIceMessage(canditate);
            break;

        case 'bye':
            console.log("recvd bye");
            break;
    }
}

//open the websocket  to the antkorp webserver
var socket = new WebSocket('ws://bldsvrub:9981');
var sourcevid = null;
var remotevid = null;

socket.onopen = function () {
    console.log("websocket opened");
    sourcevid = document.getElementById("sourcevid");
    remotevid = document.getElementById("remotevid");
};

socket.onmessage = function (event) { 
    if (!clientIdRecvd) {
        var reqObj = eval('(' + event.data + ')');
        clientId = reqObj.clientid;
        svcName  = reqObj.service;
        clientIdRecvd = true;
    } else {
        //hookup the new handler to process session requests
        handleRtcMessage(event.data);
    }
};

socket.onclose = function (event) { socket = null; };

Answer 1

the above code pasted contains a small bug, the stream should be added to the peer connection before generating the answer or offer , that is “addStream” should be called before any of setlocalDescription or setRemoteDescription calls.