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client.html
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client.html
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<!doctype html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<style>
html, body {
background-color: #333;
}
video {
width: 320px;
height: 240px;
border: 1px solid black;
}
</style>
<script src="https://cdn.socket.io/socket.io-1.4.5.js"></script>
<script>
/** CONFIG **/
//var SIGNALING_SERVER = "http://localhost:8080";
var SIGNALING_SERVER = window.location.protocol + "://" + window.location.hostname + (window.location.port ? ":" + window.location.port : "");
var USE_AUDIO = true;
var USE_VIDEO = true;
var DEFAULT_CHANNEL = 'some-global-channel-name';
var MUTE_AUDIO_BY_DEFAULT = false;
/** You should probably use a different stun server doing commercial stuff **/
/** Also see: https://gist.github.com/zziuni/3741933 **/
var ICE_SERVERS = [
{urls:"stun:stun.l.google.com:19302"}
];
</script>
<script>
var signaling_socket = null; /* our socket.io connection to our webserver */
var local_media_stream = null; /* our own microphone / webcam */
var peers = {}; /* keep track of our peer connections, indexed by peer_id (aka socket.io id) */
var peer_media_elements = {}; /* keep track of our <video>/<audio> tags, indexed by peer_id */
function init() {
console.log("Connecting to signaling server");
signaling_socket = io(SIGNALING_SERVER);
signaling_socket = io();
signaling_socket.on('connect', function() {
console.log("Connected to signaling server");
setup_local_media(function() {
/* once the user has given us access to their
* microphone/camcorder, join the channel and start peering up */
join_chat_channel(DEFAULT_CHANNEL, {'whatever-you-want-here': 'stuff'});
});
});
signaling_socket.on('disconnect', function() {
console.log("Disconnected from signaling server");
/* Tear down all of our peer connections and remove all the
* media divs when we disconnect */
for (peer_id in peer_media_elements) {
peer_media_elements[peer_id].remove();
}
for (peer_id in peers) {
peers[peer_id].close();
}
peers = {};
peer_media_elements = {};
});
function join_chat_channel(channel, userdata) {
signaling_socket.emit('join', {"channel": channel, "userdata": userdata});
}
function part_chat_channel(channel) {
signaling_socket.emit('part', channel);
}
/**
* When we join a group, our signaling server will send out 'addPeer' events to each pair
* of users in the group (creating a fully-connected graph of users, ie if there are 6 people
* in the channel you will connect directly to the other 5, so there will be a total of 15
* connections in the network).
*/
signaling_socket.on('addPeer', function(config) {
console.log('Signaling server said to add peer:', config);
var peer_id = config.peer_id;
if (peer_id in peers) {
/* This could happen if the user joins multiple channels where the other peer is also in. */
console.log("Already connected to peer ", peer_id);
return;
}
var peer_connection = new RTCPeerConnection(
{"iceServers": ICE_SERVERS},
{"optional": [{"DtlsSrtpKeyAgreement": true}]} /* this will no longer be needed by chrome
* eventually (supposedly), but is necessary
* for now to get firefox to talk to chrome */
);
peers[peer_id] = peer_connection;
peer_connection.onicecandidate = function(event) {
if (event.candidate) {
signaling_socket.emit('relayICECandidate', {
'peer_id': peer_id,
'ice_candidate': {
'sdpMLineIndex': event.candidate.sdpMLineIndex,
'candidate': event.candidate.candidate
}
});
}
}
peer_connection.ontrack = function(event) {
console.log("ontrack", event);
var remote_media = USE_VIDEO ? $("<video>") : $("<audio>");
remote_media.attr("autoplay", "autoplay");
if (MUTE_AUDIO_BY_DEFAULT) {
remote_media.attr("muted", "true");
}
remote_media.attr("controls", "");
peer_media_elements[peer_id] = remote_media;
$('body').append(remote_media);
attachMediaStream(remote_media[0], event.streams[0]);
}
/* Add our local stream */
peer_connection.addStream(local_media_stream);
/* Only one side of the peer connection should create the
* offer, the signaling server picks one to be the offerer.
* The other user will get a 'sessionDescription' event and will
* create an offer, then send back an answer 'sessionDescription' to us
*/
if (config.should_create_offer) {
console.log("Creating RTC offer to ", peer_id);
peer_connection.createOffer(
function (local_description) {
console.log("Local offer description is: ", local_description);
peer_connection.setLocalDescription(local_description,
function() {
signaling_socket.emit('relaySessionDescription',
{'peer_id': peer_id, 'session_description': local_description});
console.log("Offer setLocalDescription succeeded");
},
function() { Alert("Offer setLocalDescription failed!"); }
);
},
function (error) {
console.log("Error sending offer: ", error);
});
}
});
/**
* Peers exchange session descriptions which contains information
* about their audio / video settings and that sort of stuff. First
* the 'offerer' sends a description to the 'answerer' (with type
* "offer"), then the answerer sends one back (with type "answer").
*/
signaling_socket.on('sessionDescription', function(config) {
console.log('Remote description received: ', config);
var peer_id = config.peer_id;
var peer = peers[peer_id];
var remote_description = config.session_description;
console.log(config.session_description);
var desc = new RTCSessionDescription(remote_description);
var stuff = peer.setRemoteDescription(desc,
function() {
console.log("setRemoteDescription succeeded");
if (remote_description.type == "offer") {
console.log("Creating answer");
peer.createAnswer(
function(local_description) {
console.log("Answer description is: ", local_description);
peer.setLocalDescription(local_description,
function() {
signaling_socket.emit('relaySessionDescription',
{'peer_id': peer_id, 'session_description': local_description});
console.log("Answer setLocalDescription succeeded");
},
function() { Alert("Answer setLocalDescription failed!"); }
);
},
function(error) {
console.log("Error creating answer: ", error);
console.log(peer);
});
}
},
function(error) {
console.log("setRemoteDescription error: ", error);
}
);
console.log("Description Object: ", desc);
});
/**
* The offerer will send a number of ICE Candidate blobs to the answerer so they
* can begin trying to find the best path to one another on the net.
*/
signaling_socket.on('iceCandidate', function(config) {
var peer = peers[config.peer_id];
var ice_candidate = config.ice_candidate;
peer.addIceCandidate(new RTCIceCandidate(ice_candidate));
});
/**
* When a user leaves a channel (or is disconnected from the
* signaling server) everyone will recieve a 'removePeer' message
* telling them to trash the media channels they have open for those
* that peer. If it was this client that left a channel, they'll also
* receive the removePeers. If this client was disconnected, they
* wont receive removePeers, but rather the
* signaling_socket.on('disconnect') code will kick in and tear down
* all the peer sessions.
*/
signaling_socket.on('removePeer', function(config) {
console.log('Signaling server said to remove peer:', config);
var peer_id = config.peer_id;
if (peer_id in peer_media_elements) {
peer_media_elements[peer_id].remove();
}
if (peer_id in peers) {
peers[peer_id].close();
}
delete peers[peer_id];
delete peer_media_elements[config.peer_id];
});
}
/***********************/
/** Local media stuff **/
/***********************/
function setup_local_media(callback, errorback) {
if (local_media_stream != null) { /* ie, if we've already been initialized */
if (callback) callback();
return;
}
/* Ask user for permission to use the computers microphone and/or camera,
* attach it to an <audio> or <video> tag if they give us access. */
console.log("Requesting access to local audio / video inputs");
navigator.getUserMedia = ( navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia);
attachMediaStream = function(element, stream) {
console.log('DEPRECATED, attachMediaStream will soon be removed.');
element.srcObject = stream;
};
navigator.mediaDevices.getUserMedia({"audio":USE_AUDIO, "video":USE_VIDEO})
.then(function(stream) { /* user accepted access to a/v */
console.log("Access granted to audio/video");
local_media_stream = stream;
var local_media = USE_VIDEO ? $("<video>") : $("<audio>");
local_media.attr("autoplay", "autoplay");
local_media.attr("muted", "true"); /* always mute ourselves by default */
local_media.attr("controls", "");
$('body').append(local_media);
attachMediaStream(local_media[0], stream);
if (callback) callback();
})
.catch(function() { /* user denied access to a/v */
console.log("Access denied for audio/video");
alert("You chose not to provide access to the camera/microphone, demo will not work.");
if (errorback) errorback();
})
}
</script>
</head>
<body onload='init()'>
<!--
the <video> and <audio> tags are all added and removed dynamically
in 'onAddStream', 'setup_local_media', and 'removePeer'/'disconnect'
-->
</body>
</html>