wavesurfer.js
Version:
Interactive navigable audio visualization using Web Audio and Canvas
173 lines (141 loc) • 7.13 kB
HTML
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>wavesurfer.js | Panner Example</title>
<link href="data:image/gif;" rel="icon" type="image/x-icon" />
<!-- Bootstrap -->
<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet">
<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap-glyphicons.css" rel="stylesheet">
<link rel="stylesheet" href="../css/style.css" />
<link rel="stylesheet" href="../css/ribbon.css" />
<link rel="screenshot" itemprop="screenshot" href="http://katspaugh.github.io/wavesurfer.js/example/screenshot.png" />
<!-- wavesurfer.js -->
<script src="../../src/wavesurfer.js"></script>
<script src="../../src/webaudio.js"></script>
<script src="../../src/drawer.js"></script>
<script src="../../src/drawer.canvas.js"></script>
<!-- Demo -->
<script src="main.js"></script>
</head>
<body itemscope itemtype="http://schema.org/WebApplication">
<div class="container">
<div class="header">
<ul class="nav nav-pills pull-right">
<li><a href="/"><i class="glyphicon glyphicon-home"></i></a></li>
</ul>
<h1 itemprop="name">Panner Filter Example</h1>
</div>
<div id="demo">
<div id="waveform">
<div class="progress progress-striped active" id="progress-bar">
<div class="progress-bar progress-bar-info"></div>
</div>
<!-- Here be the waveform -->
</div>
<div class="controls">
<button class="btn btn-primary" data-action="play">
<i class="glyphicon glyphicon-play"></i>
Play
/
<i class="glyphicon glyphicon-pause"></i>
Pause
</button>
<hr />
<div class="row">
<div class="col-sm-4">
← left
</div>
<div class="col-sm-4">
<!-- Panner -->
<input data-action="pan" type="range" min="-45" max="45" value="0" style="width: 100%" />
</div>
<div class="col-sm-4">
right →
</div>
</div>
</div>
</div>
<div class="row marketing">
<h3>How to Create a Panner Interface</h3>
<p>
This is an example of how to add an arbitrary Web
Audio node into a wavesurfer.js graph. Panner node
is one such node.
</p>
<hr />
<div class="col-lg-6">
<h4>1. Initialize wavesurfer.js</h4>
<p>Create a <code>WaveSurfer</code> instance and load an audio clip.</p>
<noindex><p>
<pre><code>var wavesurfer = Object.create(WaveSurfer);
wavesurfer.init({
container: '#demo' // this is the only required param
});
wavesurfer.load('media.wav');</code></pre>
</p></noindex>
<h4>2. Create a Panner Node</h4>
<p>
Create a panner node and add it to the Web
Audio graph using the <code>setFilter</code> method.
</p>
<noindex><p>
<pre><code>var panner = wavesurfer.backend.ac.createPanner();
wavesurfer.backend.setFilter(panner);</code></pre>
</p></noindex>
</div>
<div class="col-lg-6">
<h4>3. Create a Range Slider</h4>
<p>
In your HTML, add a range input.
</p>
<noindex><p>
<pre><code><input id="panner-input" type="range" min="-45" max="45" value="0" /></code></pre>
</p></noindex>
<h4>4. Bind the Range Slider</h4>
<p>
Listen to the range input's <code>input</code> event and set the panner's position
according to the input's value.
<small>Adapted from <a href="http://stackoverflow.com/a/14412601/352796">this SO answer</a>.</small>
</p>
<noindex><p>
<pre><code>var slider = document.querySelector('#panner-input');
slider.addEventListener('input', function (e) {
var xDeg = parseInt(e.target.value);
var x = Math.sin(xDeg * (Math.PI / 180));
wavesurfer.panner.setPosition(x, 0, 0);
});</code></pre>
</p></noindex>
</div>
</div>
<div class="footer row">
<div class="col-sm-12">
<a rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.en_US"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by/3.0/80x15.png" /></a>
</div>
<div class="col-sm-7">
<span xmlns:dct="http://purl.org/dc/terms/" href="http://purl.org/dc/dcmitype/Text" property="dct:title" rel="dct:type">wavesurfer.js</span> by <a xmlns:cc="http://creativecommons.org/ns#" href="https://github.com/katspaugh/wavesurfer.js" property="cc:attributionName" rel="cc:attributionURL">katspaugh</a> is licensed under a <a style="white-space: nowrap" rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.en_US">Creative Commons Attribution 3.0 Unported License</a>.
</div>
<div class="col-sm-5">
<div class="pull-right">
<noindex>
The audio file is from <a rel="nofollow" href="http://spokencorpora.ru/">spokencorpora.ru</a>, used with permission.
</noindex>
</div>
</div>
</div>
</div>
<div class="github-fork-ribbon-wrapper right">
<div class="github-fork-ribbon">
<a itemprop="isBasedOnUrl" href="https://github.com/katspaugh/wavesurfer.js">Fork me on GitHub</a>
</div>
</div>
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