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<!DOCTYPE html>
<html>
<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 {
box-shadow: 3px 3px 20px #919191;
margin: 0 0 24px 0;
-moz-box-shadow: 3px 3px 20px #919191;
-webkit-box-shadow: 3px 3px 20px #919191;
line-height: 0;
}
#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;
}
</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> |
Changing the Media URL |
<a href="multi-channel.html">Multi-Channel Waveform</a> |
<a href="custom-markers.html">Custom Point and Segment Markers</a>
</p>
<h2>Demo: Changing the Media URL</h2>
<p>
This demo shows how to change the media URL and update the waveform,
using the three different methods of providing waveform data to Peaks.js:
</p>
<ul>
<li>Fetching pre-computed waveform data from a web server (<code>dataUri</code> option)</li>
<li>Computing in the browser using the Web Audio API (<code>webAudio</code> option)</li>
<li>Passing waveform data directly to the Peaks instance (<code>waveformData</code> option)</li>
</ul>
</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="TOL_6min_720p_download.mp3" type="audio/mpeg">
<source src="TOL_6min_720p_download.ogg" type="audio/ogg">
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="select-audio">Select audio:</label>
<select id="select-audio"></select>
</div>
</div>
<script src="peaks.js"></script>
<script>
(function(Peaks) {
var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioContext = new AudioContext();
function requestWaveformData(url) {
return fetch(url)
.then(function(response) {
return response.arrayBuffer();
});
}
function createSources(waveformData) {
return [
{
title: 'Tree of Life',
mediaUrl: 'TOL_6min_720p_download.mp3',
dataUri: {
arraybuffer: 'TOL_6min_720p_download.dat',
json: 'TOL_6min_720p_download.json'
}
},
{
title: 'Desert Island Discs',
mediaUrl: 'sample.mp3',
webAudio: {
audioContext: audioContext
},
zoomLevels: [128, 256]
},
{
title: 'BBC Sound Effect (Cars)',
mediaUrl: '07023003.mp3',
waveformData: {
arraybuffer: waveformData
}
}
];
}
function createPeaksInstance(options) {
return new Promise(function(resolve, reject) {
Peaks.init(options, function(err, peaksInstance) {
if (err) {
reject(err);
}
else {
console.log('Peaks instance ready');
return resolve(peaksInstance);
}
});
});
}
function bindEventHandlers(peaksInstance, sources) {
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-audio');
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);
}
});
});
}
function errorHandler(err) {
console.error(err.message);
}
var options = {
containers: {
overview: document.getElementById('overview-container'),
zoomview: document.getElementById('zoomview-container')
},
mediaElement: document.getElementById('audio'),
dataUri: {
arraybuffer: 'TOL_6min_720p_download.dat',
json: 'TOL_6min_720p_download.json'
},
keyboard: true,
pointMarkerColor: '#006eb0',
showPlayheadTime: true,
zoomLevels: [512, 1024, 2048]
};
createPeaksInstance(options)
.then(function(peaksInstance) {
requestWaveformData('07023003-2channel.dat')
.then(function(waveformData) {
return createSources(waveformData);
})
.then(function(sources) {
bindEventHandlers(peaksInstance, sources);
}, errorHandler);
}, errorHandler);
})(peaks);
</script>
</body>
</html>