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zoomable-waveform.html
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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;
display: grid;
grid-template-columns: 200px auto 200px;
}
#zoomview-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;
height: 200px;
}
#zoomview-container .konvajs-content {
width: 100% !important;
}
#demo-controls {
margin: 0 auto 24px auto;
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;
}
</style>
</head>
<body>
<div id="margin-left">
</div>
<div id="main">
<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> |
Single Zoomable Waveform |
<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> |
<a href="multi-channel.html">Multi-Channel Waveform</a> |
<a href="custom-markers.html">Custom Point and Segment Markers</a>
</p>
<h2>Demo: Single Zoomable Waveform</h2>
<p>
This demo shows how configure Peaks.js to render a single zoomable
waveform view.
</p>
<div id="waveform-container">
<div id="zoomview-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">
<label for="zoom">Zoom:</label>
<select id="zoom"></select>
<input type="text" id="seek-time" value="0.0">
<button data-action="seek">Seek</button>
<label for="amplitude-scale">Amplitude scale</label>
<input type="range" id="amplitude-scale" min="0" max="10" step="1">
<label for="waveform-color">Waveform color</label>
<input type="color" id="waveform-color" value="#00e180">
<input type="text" id="start-time" value="0.0">
<button data-action="set-start-time">Set start time</button>
</div>
</div>
</div>
<div id="margin-right">
</div>
<script src="peaks.js"></script>
<script>
(function(Peaks) {
var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioContext = new AudioContext();
var options = {
containers: {
zoomview: document.getElementById('zoomview-container')
},
mediaElement: document.getElementById('audio'),
webAudio: {
audioContext: audioContext,
scale: 128,
multiChannel: false
},
zoomLevels: [128],
keyboard: true,
pointMarkerColor: '#006eb0',
zoomWaveformColor: '#00e180',
showPlayheadTime: true
};
Peaks.init(options, function(err, peaksInstance) {
if (err) {
console.error(err.message);
return;
}
console.log('Peaks instance ready');
var zoomview = peaksInstance.views.getView('zoomview');
var zoomLevels = [5, 10, 20, 30, 60, 120, 180, 'auto'];
zoomview.setZoom({ seconds: zoomLevels[0] });
var zoom = document.getElementById('zoom');
for (var i = 0; i < zoomLevels.length; i++) {
var text = zoomLevels[i] === 'auto' ? 'Fit width' : (zoomLevels[i] + " seconds");
zoom.options[i] = new Option(text, i);
}
zoom.addEventListener('change', function(event) {
var zoomLevel = zoomLevels[event.target.value];
zoomview.setZoom({ seconds: zoomLevel });
});
document.querySelector('button[data-action="seek"]').addEventListener('click', function(event) {
var time = document.getElementById('seek-time').value;
var seconds = parseFloat(time);
if (!Number.isNaN(seconds)) {
peaksInstance.player.seek(seconds);
}
});
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];
var view = peaksInstance.views.getView();
view.setAmplitudeScale(scale);
});
document.getElementById('waveform-color').addEventListener('input', function(event) {
var view = peaksInstance.views.getView();
view.setWaveformColor(event.target.value);
});
document.querySelector('button[data-action="set-start-time"]').addEventListener('click', function(event) {
var time = document.getElementById('start-time').value;
var seconds = parseFloat(time);
if (!Number.isNaN(seconds)) {
var view = peaksInstance.views.getView();
view.setStartTime(seconds);
}
});
});
})(peaks);
</script>
</body>
</html>