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multi-channel.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Peaks.js Demo Page</title>
<style>
body {
font-family: 'Helvetica neue', Helvetica, Arial, sans-serif;
}
#titles, #waveform-container {
margin: 24px auto;
width: 1000px;
}
#zoomview-container, #overview-container {
margin: 0 0 24px 0;
line-height: 0;
-moz-box-shadow: 3px 3px 20px #919191;
-webkit-box-shadow: 3px 3px 20px #919191;
box-shadow: 3px 3px 20px #919191;
}
#zoomview-container {
height: 200px;
}
#overview-container {
height: 85px;
}
#demo-controls {
margin: 0 auto 24px auto;
width: 1000px;
display: flex;
align-items: center;
}
#demo-controls button {
background: #fff;
border: 1px solid #919191;
cursor: pointer;
}
#audio {
flex: 0 0 30%;
}
#controls {
flex: 1;
margin-left: 1em;
}
#seek-time {
width: 4em;
}
.log {
margin: 0 auto 24px auto;
width: 1000px;
}
table {
width: 100%;
}
table th {
text-align: left;
}
table th, table td {
padding: 0.5em;
}
.hide {
display: none;
}
p code {
margin-left: 4em
}
</style>
</head>
<body>
<div id="titles">
<h1>Peaks.js</h1>
<p>
Peaks.js is a JavaScript library that allows you to display and
interaction with audio waveforms in the browser.
</p>
<p>
It was developed by <a href="https://www.bbc.co.uk/rd">BBC R&D</a>
to allow audio editors to make accurate clippings of audio content.
You can read more about the project
<a href="https://waveform.prototyping.bbc.co.uk/">here</a>.
</p>
<h2>Demo pages</h2>
<p>
The following pages demonstrate various configuration options:
</p>
<p>
<a href="index.html">Precomputed Waveform Data</a> |
<a href="webaudio.html">Web Audio API</a> |
<a href="zoomable-waveform.html">Single Zoomable Waveform</a> |
<a href="overview-waveform.html">Single Fixed Waveform</a> |
<a href="cue-events.html">Cue Events</a> |
<a href="set-source.html">Changing the Media URL</a> |
Multi-Channel Waveform |
<a href="custom-markers.html">Custom Point and Segment Markers</a> |
<a href="external-player.html">External Audio Player</a>
</p>
<h2>Demo: Multi-Channel Waveform</h2>
<p>
This demo shows how to show a stereo waveform. Use the <b>Select source</b>
control to switch between pre-computed waveform data, fetched from the
web server, and waveform data generated in the browser using the Web
Audio API.
</p>
<p>
The pre-computed waveform data was produced using
<a href="https://github.com/bbc/audiowaveform">audiowaveform</a>, with
the following options:
</p>
<p>
<code>audiowaveform -i 07023003.mp3 -o 07023003-2channel.dat -b 8 --split-channels</code>
</p>
<p>
Audio content is copyright BBC, from the <a href="http://bbcsfx.acropolis.org.uk/?q=07023003">BBC Sound Effects</a>
library, used under the terms of the
<a href="https://github.com/bbcarchdev/Remarc/blob/master/doc/2016.09.27_RemArc_Content%20licence_Terms%20of%20Use_final.pdf">RemArc Licence</a>.
</p>
</div>
<div id="waveform-container">
<div id="zoomview-container"></div>
<div id="overview-container"></div>
</div>
<div id="demo-controls">
<audio id="audio" controls="controls">
<source src="07023003.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>
<div id="controls">
<button data-action="zoom-in">Zoom in</button>
<button data-action="zoom-out">Zoom out</button>
<label for="amplitude-scale">Amplitude scale</label>
<input type="range" id="amplitude-scale" min="0" max="10" step="1">
<label for="select-source">Select source:</label>
<select id="select-source"></select>
<div>
<label for="zoomview-color">Zoomview color</label>
<input type="color" id="zoomview-color" value="#00e180">
<label for="overview-color">Overview color</label>
<input type="color" id="overview-color" value="#cccccc">
</div>
</div>
</div>
<script src="peaks.js"></script>
<script>
(function(Peaks) {
var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioContext = new AudioContext();
var sources = [
{
title: 'Remote',
mediaUrl: '07023003.mp3',
dataUri: {
arraybuffer: '07023003-2channel.dat',
}
},
{
title: 'Web Audio',
mediaUrl: '07023003.mp3',
webAudio: {
audioContext: audioContext,
multiChannel: true
}
}
];
var options = {
containers: {
overview: document.getElementById('overview-container'),
zoomview: document.getElementById('zoomview-container')
},
mediaElement: document.getElementById('audio'),
dataUri: {
arraybuffer: '07023003-2channel.dat'
},
keyboard: true,
pointMarkerColor: '#006eb0',
overviewWaveformColor: '#cccccc',
zoomWaveformColor: '#00e180',
showPlayheadTime: true,
zoomLevels: [128, 256, 512, 1024, 2048]
};
Peaks.init(options, function(err, peaksInstance) {
if (err) {
console.log(err.message);
return;
}
console.log('Peaks instance ready');
document.querySelector('[data-action="zoom-in"]').addEventListener('click', function() {
peaksInstance.zoom.zoomIn();
});
document.querySelector('[data-action="zoom-out"]').addEventListener('click', function() {
peaksInstance.zoom.zoomOut();
});
var select = document.getElementById('select-source');
for (var i = 0; i < sources.length; i++) {
select.options[i] = new Option(sources[i].title, i);
}
select.addEventListener('change', function(event) {
var source = sources[event.target.value];
peaksInstance.setSource(source, function(error) {
if (error) {
console.error('setSource error', error);
}
});
});
var amplitudeScales = {
"0": 0.0,
"1": 0.1,
"2": 0.25,
"3": 0.5,
"4": 0.75,
"5": 1.0,
"6": 1.5,
"7": 2.0,
"8": 3.0,
"9": 4.0,
"10": 5.0
};
document.getElementById('amplitude-scale').addEventListener('input', function(event) {
var scale = amplitudeScales[event.target.value];
peaksInstance.views.getView('zoomview').setAmplitudeScale(scale);
});
document.getElementById('zoomview-color').addEventListener('input', function(event) {
var view = peaksInstance.views.getView('zoomview');
view.setWaveformColor(event.target.value);
});
document.getElementById('overview-color').addEventListener('input', function(event) {
var view = peaksInstance.views.getView('overview');
view.setWaveformColor(event.target.value);
});
});
})(peaks);
</script>
</body>
</html>