I am trying to implement a very simple video chat based on the WebRTC API. Unfortunately, my code only works with Chrome-to-Chrome and Firefox-Firefox so far.
If I try it from Chrome to Firefox or from Firefox to Chrome, I get the following error output:
Failed to set local offer sdp: Session error code: ERROR_CONTENT. Session error description: Failed to set local video description recv parameters..(anonymous function) @ helloWebRtc.js:126***
Perhaps I missed something or do I need flags in Chrome or Firefox?
Do you have any ideas? I would be grateful for any help I can solve to solve this problem.
Thank you all in advance!
My is helloWebRtc.jsas follows:
var localVideo = document.querySelector("#localVideo");
var remoteVideo = document.querySelector("#remoteVideo");
var SIGNAL_ROOM = "signal_room";
var CHAT_ROOM = "chat_room";
var serverConfig = {
"iceServers": [
{
"urls": "stun:stun.l.google.com:19302"
}
]
};
var optionalConfig = {
optional: [
{
RtpDataChannels: true
},
{
DtlsSrtpKeyAgreement: true
}
]
};
var rtcPeerConn,
localStream;
io = io.connect();
io.emit("ready", {"chat_room": CHAT_ROOM, "signal_room": SIGNAL_ROOM});
io.emit("signal", {
"room": SIGNAL_ROOM,
"type": "user_here",
"message": "new user joined the room"
});
io.on("rtcSignaling", function(data) {
if(!rtcPeerConn) {
startSignaling();
}
if(data.type !== "user_here" && data.message) {
var message = JSON.parse(data.message);
if(message.description) {
var remoteDesc = new RTCSessionDescription(message.description);
rtcPeerConn.setRemoteDescription(remoteDesc, function() {
if(rtcPeerConn.remoteDescription.type === "offer") {
rtcPeerConn.createAnswer(sendLocalDescription, function(error) {
console.error("error on creating answer", error);
});
}
}, function(error) {
console.error("error on set remote description", error);
});
} else if(message.candidate) {
var iceCandidate = new RTCIceCandidate(message.candidate);
rtcPeerConn.addIceCandidate(iceCandidate);
}
}
});
function startSignaling() {
rtcPeerConn = new RTCPeerConnection(serverConfig, optionalConfig);
rtcPeerConn.onicecandidate = function(event) {
if(event.candidate) {
io.emit("signal", {
"room": SIGNAL_ROOM,
"type": "candidate",
"message": JSON.stringify({
"candidate": event.candidate
})
});
}
};
rtcPeerConn.onnegotiationneeded = function() {
rtcPeerConn.createOffer(sendLocalDescription, function(error) {
console.error("error on creating offer", error);
});
};
rtcPeerConn.onaddstream = function(event) {
console.info("on add stream called");
remoteVideo.srcObject = event.stream;
};
navigator.mediaDevices.getUserMedia({
audio: true,
video: true
})
.then(function(stream) {
localVideo.srcObject = stream;
localStream = stream;
rtcPeerConn.addStream(localStream);
})
.catch(function(e) {
alert('getUserMedia() error: ' + e.name);
});
}
function sendLocalDescription(description) {
rtcPeerConn.setLocalDescription(
description,
function() {
io.emit("signal", {
"room": SIGNAL_ROOM,
"type": "description",
"message": JSON.stringify({
"description": rtcPeerConn.localDescription
})
});
},
function(error) {
console.error("error to set local desc", error);
}
);
}
My NodeJS server (using express.io) looks like this:
var express = require('express.io');
var app = express();
var PORT = 8686;
app.http().io();
console.log('server started @ localhost:8686');
app.use(express.static(__dirname + '/views'));
app.use('/scripts', express.static(__dirname + '/scripts'));
app.get('/', function(req, res) {
res.sendFile('index.html');
});
app.io.route('ready', function(req) {
req.io.join(req.data.chat_room);
req.io.join(req.data.signal_room);
app.io.room(req.data.chat_room).broadcast('announce', {
message: 'New client in the ' + req.data.chat_room + ' room.'
});
});
app.io.route('send', function(req) {
app.io.room(req.data.room).broadcast('message', {
message: req.data.message,
author: req.data.author
});
});
app.io.route('signal', function(req) {
if(req.data.type === "description" || req.data.type === "candidate")
req.io.room(req.data.room).broadcast('rtcSignaling', {
type: req.data.type,
message: req.data.message
});
else
req.io.room(req.data.room).broadcast('rtcSignaling', {
type: req.data.type
});
});
app.listen(PORT);