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webaudio.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Peaks.js Demo Page</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div id="titles">
<h1>Peaks.js</h1>
<p>
Peaks.js is a JavaScript library that allows you to display and
interact with audio waveforms in the browser.
</p>
<h2>Demo pages</h2>
<p>
The following pages demonstrate various configuration options:
</p>
<p>
<a href="/index.html">Precomputed Waveform Data</a> |
Web Audio API |
<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> |
<a href="/multi-channel.html">Multi-Channel Waveform</a> |
<a href="/custom-markers">Custom Point and Segment Markers</a> |
<a href="/overlay-segments.html">Overlay Segments</a> |
<a href="/external-player.html">External Audio Player</a> |
<a href="/scrollbar.html">Scrollbar</a>
</p>
<h2>Demo: Web Audio API</h2>
<p>
This demo shows how to use an
<a href="https://www.w3.org/TR/webaudio/#AudioContext">AudioContext</a>
to compute the waveform in the browser. Due to the memory requirements
and processing time needed, this only works well for short duration
audio.
</p>
</div>
<div class="waveform-container">
<div id="zoomview-container"></div>
</div>
<div class="waveform-container">
<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; codecs="vorbis"'>
Your browser does not support the audio element.
</audio>
<div id="controls">
<div>
<button data-action="zoom-in">Zoom in</button>
<button data-action="zoom-out">Zoom out</button>
</div>
<div>
<button data-action="add-segment">Add Segment</button>
<button data-action="add-point">Add Point</button>
<button data-action="log-data">Log segments/points</button>
</div>
<div>
<input type="text" id="seek-time" value="0.0">
<button data-action="seek">Seek</button>
</div>
</div>
</div>
<div class="log">
<div id="segments" class="hide">
<h2>Segments</h2>
<table>
<thead>
<tr>
<th>ID</th>
<th>Label</th>
<th>Start time</th>
<th>End time</th>
<th></th>
</tr>
</thead>
<tbody>
</tbody>
</table>
</div>
<div id="points" class="hide">
<h2>Points</h2>
<table>
<thead>
<tr>
<th>ID</th>
<th>Label</th>
<th>Time</th>
</tr>
</thead>
<tbody>
</tbody>
</table>
</div>
</div>
<script src="/peaks.js"></script>
<script>
(function(Peaks) {
var renderSegments = function(peaks) {
var segmentsContainer = document.getElementById('segments');
var segments = peaks.segments.getSegments();
var html = '';
for (var i = 0; i < segments.length; i++) {
var segment = segments[i];
var row = '<tr>' +
'<td>' + segment.id + '</td>' +
'<td>' + segment.labelText + '</td>' +
'<td>' + segment.startTime + '</td>' +
'<td>' + segment.endTime + '</td>' +
'<td>' + '<a href="#' + segment.id + '" data-action="play-segment" data-id="' + segment.id + '">Play</a>' + '</td>' +
'<td>' + '<a href="#' + segment.id + '" data-action="remove-segment" data-id="' + segment.id + '">Remove</a>' + '</td>' +
'</tr>';
html += row;
}
segmentsContainer.querySelector('tbody').innerHTML = html;
if (html.length) {
segmentsContainer.classList.remove('hide');
}
}
var renderPoints = function(peaks) {
var pointsContainer = document.getElementById('points');
var points = peaks.points.getPoints();
var html = '';
for (var i = 0; i < points.length; i++) {
var point = points[i];
var row = '<tr>' +
'<td>' + point.id + '</td>' +
'<td>' + point.labelText + '</td>' +
'<td>' + point.time + '</td>' +
'<td>' + '<a href="#' + point.id + '" data-action="remove-point" data-id="' + point.id + '">Remove</a>' + '</td>' +
'</tr>';
html += row;
}
pointsContainer.querySelector('tbody').innerHTML = html;
if (html.length) {
pointsContainer.classList.remove('hide');
}
}
var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioContext = new AudioContext();
var audioElement = document.getElementById('audio');
var options = {
zoomview: {
container: document.getElementById('zoomview-container')
},
overview: {
container: document.getElementById('overview-container')
},
mediaElement: audioElement,
webAudio: {
audioContext: audioContext,
scale: 128,
multiChannel: false
},
keyboard: true,
pointMarkerColor: '#006eb0',
showPlayheadTime: true,
zoomLevels: [128, 256, 512, 1024, 2048, 4096]
};
Peaks.init(options, function(err, peaksInstance) {
if (err) {
console.error(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();
});
document.querySelector('button[data-action="add-segment"]').addEventListener('click', function() {
peaksInstance.segments.add({
startTime: peaksInstance.player.getCurrentTime(),
endTime: peaksInstance.player.getCurrentTime() + 2,
labelText: "Test segment",
editable: true
});
});
document.querySelector('button[data-action="add-point"]').addEventListener('click', function() {
peaksInstance.points.add({
time: peaksInstance.player.getCurrentTime(),
labelText: "Test point",
editable: true
});
});
document.querySelector('button[data-action="log-data"]').addEventListener('click', function(event) {
renderSegments(peaksInstance);
renderPoints(peaksInstance);
});
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);
}
});
document.querySelector('body').addEventListener('click', function(event) {
var element = event.target;
var action = element.getAttribute('data-action');
var id = element.getAttribute('data-id');
if (action === 'play-segment') {
var segment = peaksInstance.segments.getSegment(id);
peaksInstance.player.playSegment(segment);
}
else if (action === 'remove-point') {
peaksInstance.points.removeById(id);
}
else if (action === 'remove-segment') {
peaksInstance.segments.removeById(id);
}
});
});
})(peaks);
</script>
</body>
</html>