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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>WebRTC: Simple P2P Communication for the Web</title>
<meta name="description" content="WebRTC: Simple P2P Communication for the Web">
<meta name="author" content="Jan Lelis">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="css/reveal.min.css">
<link rel="stylesheet" href="css/theme/default.css" id="theme">
<link rel="stylesheet" href="lib/css/zenburn.css">
<script>
document.write( '<link rel="stylesheet" href="css/print/' + ( window.location.search.match( /print-pdf/gi ) ? 'pdf' : 'paper' ) + '.css" type="text/css" media="print">' );
</script>
<style>
#gum-video {
height: 1000px;
background: black;
box-shadow: 0px 0px 20px #333;
}
pre code {
font-size: 21pt;
line-height: 25pt;
background: #111;
}
pre .xml .javascript {
opacity: 1;
color: #fff;
}
</style>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<section>
<h1>WebRTC</h1>
<h2>Simple P2P Communication for the Web</h2>
<br>
<p>JSUnconf EU 2014 / <a href="https://twitter.com/JanLelis">@JanLelis</a></p>
</section>
<section>
<h2>palava.tv</h2>
<h3>Browser-to-Browser Video</h3>
<img src="images/palava-logo.png" style="border: 0px; width: 250px" />
<p>Completely Open Source</p>
<p>Run by a Non-Profit</p>
</section>
</section>
<section>
<section>
<h2>RTCWEB / IETF</h2>
<p>Enables P2P Connections between Browsers ...</p>
<p>... including Video/Audio Streams</p>
<p class="fragment">Adapts and existing VOIP Technologies</p>
<p class="fragment">Almost every major Player sits at the Table</p>
</section>
<section>
<h2>WebRTC / W3C</h2>
<p>JavaScript API for the RTCWEB</p>
<p class="fragment">Supported in Blink and Mozilla</p>
</section>
<section>
<h1>WebRTC</h1>
<p>Brings P2P/Real-time Communication to the Web!</p>
<p class="fragment">Supported in Blink and Mozilla</p>
</section>
</section>
<section>
<section>
<h2>Video Conferences?</h2>
<p>Pure WebRTC limited to Mesh Structure</p>
<p class="fragment">More with Multipoint Control Units / Selective Forwarding Units</p>
</section>
</section>
<section>
<section>
<h2>JavaScript API</h2>
<img src="images/webrtc-components.png" />
</section>
<section>
<h2>JavaScript API: getUserMedia</h2>
</section>
<section>
<h3><code>getUserMedia</code></h3>
<pre><code data-trim contenteditable class="javascript">
<video id="gum-video" autoplay="autoplay">
<script>
navigator.webkitGetUserMedia(
{video: true, audio: false},
function(stream) {
document.getElementById('gum-video').src =
webkitURL.createObjectURL(stream);
}
);
</script>
</code></pre>
</section>
<section data-state="gum-demo">
<video id="gum-video" autoplay="autoplay">
</section>
</section>
<section>
<section>
<h2>P2P connection requirements</h2>
<p>Initialization is done using a Signaling "Rendevouz" Server</p>
<p class="fragment">Exchange of Streaming Properties (SDP)</p>
<p class="fragment">NAT Traversal via ICE: STUN/TURN Servers</p>
</section>
</section>
<section>
<section>
<h2>WebRTC Signaling Concept</h2>
<p>Developer implements how to establish a <code>PeerConnection</code></p>
<p class="fragment">Custom Protocols vs. XMPP</p>
<p class="fragment">WebSockets vs. XHR vs. Pidgeons</p>
</section>
<section>
<h3>External Signaling Channel</h3>
<img src="images/signaling-server.png">
</section>
<section>
<h3>Find Peers</h3>
<img src="images/join.png">
</section>
<section>
<h3>Exchange Media Capbilities</h3>
<img src="images/offer-answer.png">
</section>
<section>
<h3>"Hole Punching"</h3>
<img src="images/stun2.png">
</section>
<section>
<h3>Success!</h3>
<img src="images/peerconnection.png">
</section>
<section>
<h2>Example Signaling Servers</h2>
<p>palava-machine (ruby)</p>
<p>signalmaster (node.js)</p>
<p>webrtc.io (node.js)</p>
<p>together.js hub (node.js)</p>
<p>peerjs server (node.js)</p>
<br/><br/>
<h3 class="fragment">I am working on a service: <a href="http://signaling.io">signaling.io</a></h3>
</section>
</section>
<section>
<section>
<h2>Palava Machine Signaling Protocol</h2>
<p>A few defined JSON messages</p>
</section>
<section>
<h3>Client → Server</h3><br/>
<p><code>join_room(room_id, status)</code></p>
<p><code>send_to_peer(peer_id, data)</code></p>
<p><code>update_status(status)</code></p>
</section>
<section>
<h3>Server → Client</h3><br/>
<p><code>joined_room(me, peers)</code></p>
<p><code>peer_updated_status(peer_id, peer_status)</code></p>
<p><code>error(id, message)</code></p>
<p><code>shutdown(seconds)</code></p>
</section>
<section>
<h3>Client → Client</h3>
<h4>via <code>send_to_peer</code></h4><br/>
<p><code>offer(sdp)</code></p>
<p><code>answer(sdp)</code></p>
<p><code>ice_candidate(...)</code></p>
</section>
</section>
<section>
<section>
<h2>JavaScript API: PeerConnection</h2>
</section>
<section>
<h3>Prepare <code>PeerConnection</code></h3>
<pre><code data-trim contenteditable class="javascript">
// already got localStream via getUserMedia
var pc = new webkitRTCPeerConnection(
{iceServers: [{url: "stun:93.186.193.18"}]},
{optional: [{DtlsSrtpKeyAgreement: true}]}
);
pc.addStream(localStream);
pc.onaddstream = function(event) {
console.log("adding remote stream");
$('#video-tag')[0].src =
webkitURL.createObjectURL(event.stream);
};
</code></pre>
</section>
<section>
<h3>Establish <code>PeerConnection</code></h3>
<pre><code data-trim contenteditable class="javascript">
// connect to signaling provider
var server = new WebSocket('wss:machine.palava.tv');
// ...
pc.createOffer(function(sdp) {
// register local sdp in our new connection
pc.setLocalDescription(sdp);
// send the "sdp" to other peer
server.send(JSON.stringify({peer_id: 42, event: 'offer', sdp: sdp}));
// ...
</code></pre>
<pre class="fragment"><code data-trim contenteditable class="javascript">
// other peer receives 'offer' and sends an 'answer' via server
server.onmessage = function(msg) {
payload = JSON.parse(msg.data);
if(payload.event === 'answer') {
pc.setRemoteDescription(
new RTCSessionDescription(payload.sdp)
);
</code></pre>
<pre class="fragment"><code data-trim contenteditable class="javascript">
// exchange ice candidates... when finished:
// pc.onaddstream callback will be called by WebRTC
</code></pre>
</section>
</section>
<section>
<section>
<h2>WebRTC / Conclusion</h2>
<p>Allows for a new generation of real-time applications</p>
<p class="fragment">Provides a simple JavaScript APIs for doing so</p>
<div class="fragment">
<br/><p><strong>It is a standard:</strong></p>
<p>It is designed to be compatible with the rest of the world</p>
</div>
</section>
<section>
<h2>Thank you!</h2>
<p><a href="https://palava.tv">palava.tv</a></p>
<p><a href="http://signaling.io">signaling.io</a></p>
<p>slides: <a href="https://palavatv.github.com/talk-jsunconf-webrtc">palavatv.github.com/talk-jsunconf-webrtc</a></p>
<p>good resources: <a href="https://webrtchacks.com">webrtchacks.com</p>
</section>
</section>
</div>
</div>
<script src="lib/js/head.min.js"></script>
<script src="js/reveal.min.js"></script>
<script>
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