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		<h3>REALTIME WEB TECHNOLOGIES IN THE NETWORKED PERFORMANCE ENVIRONMENT</h3>
		<p>
		  <i><small>- <a href="http://rob.kiben.net">http://rob.kiben.net</a> <a href="rob@kiben.net">rob@kiben.net</a> -</small></i>
		</p>

		<p class="fragment">Rob Canning <br> Department of Music<br>Goldsmiths, University of London</p>
	      </section>

	      <section>
		<h2>NODESCORE</h2>
		<p>
		  NodeScore is a web based framework to facilitate networked ensemble performance.
		</p>
<br/><br/>
		<ul class="fragment">

		  <li>NOT a synthesis system</li>
		  <li>NOT a composition tool</li>
		  <li>NO control level output (OSC etc.)</li>

		  <br/>
		  <li class="fragment">DOES push cues/notation to human performers</li>
		  <li class="fragment">Precomposed or on-the-fly </li>

		  <br/>

	</ul>

	      </section>


	      <section>
		<h2>LOCAL</h2> <br/>

		<li>Telepresence vs. Presence</li>


		<br/>

		<ul class="fragment">
		"Hypertextual"/ NonLinear Scores/Strategies
		<br/>
		<li>Composed/Mediated Improvisation</li>
		<li>London Improvisors Orchestra (LIO) "Conductions"</li>
		<li>Zorn's Cobra - Flash Card Rule based Systems</li>
		<br/>
		</ul>

	      </section>


	      <section>
		<h2>Dramaturgies</h2>
	  	Interaction - Distributed Controls/Authorship
		<blockquote>projected, directed and distributed</blockquote>
		<img width="250" height="250" src="images/directed.png" alt="BreakDOM game screenshot">
		<img width="250" height="250" src="images/democracy.png" alt="BreakDOM game screenshot">

	      </section>

	      <section>
		<h2>Performance Problems</h2> <br/>
		<ul>

		  <li>Clutter - clicktrack, stopwatch, metronome</li>
		  <li>Oversized/complex "hypertextual" paper scores</li>
		  <br/>
		  <li>Different Demands to the Laptop Orchestra</li>
		  <li>Rich Media v. Composition tool + plugin</li>
		</ul>
	      </section>


	      <section>
		<h2>NODESCORE</h2>
		<br/>
		<ul>
		  <li>Scores assembled in HTML5</li>
		  <li>Musicians displays controled remotely</li>
		  <br/>
		  <li>Not all-in-one solution - Modular Approach</li>
		  <li>May run alongside other streams: media, OSC automation etc.</li>
		</ul>
	      </section>


	      <section>
		<h2>Standards Compliant</h2>

		    <img width="300" src="images/tim.jpg" alt="BreakDOM game screenshot">
		<ul>
		  <li>HTML5</li>
		  <li>CSS3</li>
		  <li>(JAVASCRIPT)</li>
		  <li>WEBSOCKETS</li>
		</ul>
		<br><br>
		<p>
		  Open Source - No Plugins <br>(Flash, Flex, Shockwave, Java)
		</p>
	      </section>

	      <section>
		traditional model:
		<img height="150" src="images/traditionalhttp.png" alt="http req res">
		<br/>
		<h2>Server Push Technology</h2>
		<ul>

		  <li>AJAX/Comet Programming/Long Polling</li>
		  <li>FLASH / JAVA - FLEX - BLADEDS</li>

		  <br/>
		  <li>BOSH</li>
		      <li>WEBSOCKETS</li>
		</ul>

		<aside class="notes">
		  Oh hey, these are some notes. They'll be hidden in your presentation, but you can see them if you run the speaker notes server.
		</aside>
	      </section>


<section>
		<h2>Websockets</h2>

		<p></p>

		<a class="image" href="http://hakim.se/experiments/html5/breakdom/" target="_blank">
		  <img width="350" height="350" src="images/websockets.png" alt="BreakDOM game screenshot">
		</a>

		<ul>
		  <li>More efficient than AJAX/Comet Programming</li>
		  <li>Persistant bidirectional TCP socket</li>
		  <li>REQUEST/RESPONSE handshakes elimintated *</li>
		</ul>

		<aside class="notes">
		  Oh hey, these are some notes. They'll be hidden in your presentation, but you can see them if you run the speaker notes server.
		</aside>
	      </section>

	      <section>
		<h2>HTTP://SOCKET.IO</h2>

		<p>Socket.IO simplifies the WebSocket API and unifies the APIs of its fallback transports.</p>
		  <a class="image" href="http://hakim.se/experiments/html5/breakdom/" target="_blank">
		    <img height="250" src="images/socketio.png" alt="BreakDOM game screenshot">
		  </a>

		<aside class="notes">
		<p>Racket/PHP Alternative</p>
		</aside>
	      </section>

	      <section>
		<h2>Directed</h2>
		<img width="450" height="450" src="images/directed.png" alt="BreakDOM game screenshot">
	      </section>

	      <section>
		<h2>Distributed</h2>
		<img width="450" height="450" src="images/democracy.png" alt="BreakDOM game screenshot">
	      </section>


	      <section>
		<h2>Serverside Javascript</h2>
		<h3>NodeJS Server</h3>
		<pre><code contenteditable>var sio = require('socket.io')
, http = require('http'), fs = require('fs'), static = require('node-static');

var clientFiles = new static.Server('./www');
var httpServer = http.createServer(
    function(request, response) {
	request.addListener('end', function () {
	    clientFiles.serve(request, response);
	    process.setMaxListeners(0);
	});
    }); httpServer.listen(8889);

var io = sio.listen(httpServer);
io.set('log level', 1); // reduce logging
io.sockets.on('connection', function (socket) {</code></pre>

	      </section>

<section>
		<h2>Client Plumbing</h2>

		// load the sockets lib
		<pre><code contenteditable>&lt;script src="/socket.io/socket.io.js"&gt &lt;/script&gt
		</code></pre>
// connect to socket
<pre><code contenteditable>
var socket = io.connect();
</code></pre>

//send something down the pipe
<pre><code contenteditable>
function startChr() { socket.emit("startChr") }                                                          </code></pre>
     </section>

	      <section>
		<h2>CLIENT->SERVER->CLIENT</h2>
Chronometer on server pushes -> client
	<pre><code contenteditable>// instruction from "director" client executed on server
socket.on('startChr', function () { startChr();});
function startChr() { if (chronstate !== 1) {
   chronstate = 1; chronometer();} }
	    ---snip---
	    setTimeout(function(){chronometer()}, 100);
	    socket.broadcast.emit('chronFromServer', chron)
	    socket.emit('chronFromServer', chron)
	    ---snip---
// update chron value on the clients in line with server
socket.on("chronFromServer", function(chron) {
    $("div#client_chronometer").text(chron);
}); </code></pre>

	      </section>

	      <section>
		<h2>NODESCORE: INFO PANEL</h2>
<a class="image" href="http://hakim.se/experiments/html5/breakdom/" target="_blank">
		    <img width="700" src="images/nodescore-infopanel.png" alt="screenshot">
		  </a>

		<p>
		</p>
	      </section>

	      <section>
		<h2>NODESCORE: CHAT PANEL</h2>

		    <img width="700" src="images/nodescore-chat.png" alt="screenshot">


		<p>
		</p>
	      </section>

	      <section>
		<h2>NODESCORE: Score</h2>

		    <img width="700" src="images/nodescore-nexus.png" alt="screenshot">

		<p>
		  GNU/Lilypond - Phantom.js
		</p>
	      </section>

	      <section>
		<h2>Server Sequencer</h2>
	      </section>

	      <section>
		<h2>DEMO</h2>
	      </section>

	      <section>
		<h2>Future Work</h2>
		<p>the TODO list...</p>
		<ol>
		  <li class="fragment">Further Modularisation</li>
		  <li class="fragment">Server on embedded linux (Gumstix) + openwrt</li>
		  <li class="fragment"><em>Animated SVG, WebGL, <code>&lt;audio&gt;,&lt;video&gt;</em></code></li>
		  <li class="fragment">Annotation via stylus?</li>
		  <li class="fragment">
		    <code>work with an ensemble over extended period - eg. residency</code><br>
		  </li>
		  <li class="fragment">
		    <code >touch screen "director" interface</code><br>
		  </li>
		  <li class="fragment">
		    <code >clean up the code :)</code><br>
		  </li>

		</ol>
	      </section>


		</ul>
	      </section>

	      <section>
		<h2>links</h2>
		<a href="http://nodescore.kiben.net/p/">This Presentation: http://nodescore.kiben.net/p/</a><br><br>

		<a href="http://nodescore.kiben.net">http://nodescore.kiben.net</a><br><br>

                <a href="http://nodescore.kiben.net/p/canning_netscores_shortpaper-2012.pdf">ICMC2012 Paper</a><br><br>
		<a href="http://gitorious.org/nodescore">src: http://gitorious.org/nodescore</a><br><br>

		<a href="mailto:rc-web@kiben.net">rob@kiben.net</a><br><br>
		<a href="http://uk.linkedin.com/pub/rob-canning/35/9b5/481">
		  <img src="http://www.linkedin.com/img/webpromo/btn_liprofile_blue_80x15.png" width="80" height="15" border="0" alt="View Rob Canning's profile on LinkedIn">
		</a><br><br>


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author	Rob Canning <rc@kiben.net>
date	Tue, 21 Apr 2015 16:20:57 +0100
parents	eee1afe759d7
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