Connect to a room when arriving with WebRTC.io and NodeJS

I'm actually working on an application based on NodeJS, ws, WebRTC.io and socket.io. The aim of this application is to broadcast the video of an Host to multiple attendees.

The host and all the attendees load the web application, then the host launch his video and stream it to all the attendees. For this case I don't have any problem, but if the host launch his video, then an attendee join the room, this attendee is not able to retrieve the stream, and I don't how to get this stream.

I've tried many solution.

1st solution

When an attendee arrive in the room, he send a message via socket.io to the Host which send back his stream. The problem is that the stream arrive to the attendee as an Object and not as a MediaStream, so I can't use it.

2nd solution

When an attendee arrive in the room, he send a message via socket.io to the Host which send back a blob created with window.webkitURL.createObjectURL(rtc.streams[0]), then I use this blob as the video source for the attendee, but I obtain a 404 error.

Here is the code for both solutions :

var isStreamCreated = false;

function startVideoLive() {
    var video = document.getElementById('video');
    //Test if peer connection is available for the browser
    if (PeerConnection) {
        if (getRole() == 1) {
            rtc.createStream({
                "video": true,
                "audio": true
            }, function (stream) {
                video.src = URL.createObjectURL(stream);
                video.play();
                isStreamCreated = true
            });

        }
    }
    if (isConnected != true) {
        var room = '1234';
        rtc.connect('ws://' + server + ':8443', room);
        isConnected = true;
    }
}

function setAttendeeWebRTC() {
    if (getRole() == 0) {
        var message = {
            type: "getStreamInfos",
            URL: null,
            stream: null
        }

        socket.emit('message', message);

        rtc.on('add remote stream', function (stream, socketId) {
            rtc.attachStream(stream, 'video');
            isStreamCreated = true;
        });
    }
}

startVideoLive();
setAttendeeWebRTC();

function onGetStreamInfos(message) {
    if (getRole() == 1 && isStreamCreated == true) {

        message.URL = window.webkitURL.createObjectURL(rtc.streams[0]);
        message.stream = rtc.streams[0];

        socket.emit('message', message);
    } else if (getRole() == 0 && isStreamCreated == false && message.URL != null && message.stream != null) {

        document.getElementById('video').src = message.URL;
        // OR
        rtc.attachStream(message.stream, 'video')
        isStreamCreated = true;

    }
}

getRole() is used to know if the user connected is an attendee (0) or the host (1).

In the server side I just broadcast the websocket message, and add webrtc.io (and many other things, but not usefull in this case).

Here is the errors for the 2 case :

• With the blob : GET blob:http%3A//128.1.222.159%3A8081/881928b6-70d3-4054-b15e-88d635a2125f 404 (Not Found)

• With the stream : Uncaught TypeError: Type error
  rtc.attachStream
  onGetStreamInfos
  (anonymous function)
  EventEmitter.emit socket.io.js?=1375350434038:633
  SocketNamespace.onPacket socket.io.js?=1375350434038:2248
  Socket.onPacket socket.io.js?=1375350434038:1930
  Transport.onPacket socket.io.js?=1375350434038:1332
  Transport.onData socket.io.js?_=1375350434038:1303
  WS.open.websocket.onmessage

If someone has any ideas on how I can deal with my problem, I would thank in advance.

EDIT 1 :

I found how to figured out my problem, but there is a new problem. Here is my partial solution :

function onGetStreamInfos(message) {
    if (getRole() == 1 && isStreamCreated == true) {

        rtc.createPeerConnections();
        rtc.addStreams();
        rtc.addDataChannels();
        rtc.sendOffers()

    } else if (getRole() == 0 && isStreamCreated == false) {

        isStreamCreated = true;

    }
}

But now, when an attendee join the room the other attendees lost the video. I think it's because normally I shouldn't create peer a peer connection between the new attendee and the old one.

I'm not sure if it's very clear, but if you need more information don't hesitate to ask, and if I finally find how to fix my problem I'll give the solution here.

EDIT 2 :

By removing rtc.createPeerConnections(); and rtc.addDataChannels(); it seems to work in most of the case (I didn't test so much case).