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audiotest.html
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audiotest.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<button class="zone1">Zone 1</button>
<button class="zone2">Zone 2</button>
<button class="zone3">Zone 3</button>
<button class="zone4">Zone 4</button>
<button class="cue">Reveal</button>
<script>
var context;
var fadeInCurve, fadeOutCurve;
var audio;
function init() {
window.AudioContext = window.AudioContext || window.webkitAudioContext;
context = new AudioContext();
bufferLoader = new BufferLoader(
context,
[
'audio/quad1.ogg',
'audio/quad2.ogg',
'audio/quad3.ogg',
'audio/quad4.ogg',
'audio/discover.ogg'
],
finishedLoading
);
fadeInCurve = new Float32Array(11);
fadeOutCurve = new Float32Array(11);
for (var i = 0; i <= 10; i++) {
fadeInCurve[i] = eqlerp(i/10);
fadeOutCurve[i] = eqlerp(1-i/10);
}
bufferLoader.load();
}
function eqlerp(i) {
i = Math.min(1, Math.max(0, i));
return Math.cos((1.0 - i) * 0.5 * Math.PI);
}
function Sound(buffer) {
this.gain = context.createGain();
this.buffer = buffer;
this.output = this.gain;
}
Sound.prototype.loop = function () {
this._play(true);
}
Sound.prototype.play = function () {
this._play(false);
}
Sound.prototype.fadeOut = function (duration) {
this.gain.gain.cancelScheduledValues(context.currentTime);
this.gain.gain.setValueCurveAtTime(fadeOutCurve, context.currentTime, duration);
}
Sound.prototype.fadeIn = function (duration) {
this.gain.gain.cancelScheduledValues(context.currentTime);
this.gain.gain.setValueCurveAtTime(fadeInCurve, context.currentTime, duration);
}
Sound.prototype.getDuration = function () {
return this.buffer.duration;
}
Sound.prototype._play = function (loop) {
if (this.source) {
this.source.stop(context.currentTime);
this.source.disconnect();
}
this.source = context.createBufferSource();
this.source.buffer = this.buffer;
console.log(loop);
if (loop) {
this.source.loop = true;
} else {
this.source.loop = false;
}
this.source.connect(this.gain);
this.gain.gain = 0;
this.source.start(context.currentTime);
this.fadeIn(2);
}
function finishedLoading(buffers) {
var sounds = buffers.map(function (b) {
return new Sound(b);
});
audio = new AudioManager(sounds);
audio.setBg(0);
document.querySelector('.zone1').addEventListener('click', setBg(0));
document.querySelector('.zone2').addEventListener('click', setBg(1));
document.querySelector('.zone3').addEventListener('click', setBg(2));
document.querySelector('.zone4').addEventListener('click', setBg(3));
document.querySelector('.cue').addEventListener('click', function () {
audio.playCue(4);
});
}
function AudioManager(sounds) {
this.sounds = sounds;
this.active = null;
this.bg = context.createGain();
this.cue = context.createGain();
this.cue.connect(context.destination);
this.bg.connect(context.destination);
}
AudioManager.prototype.setBg = function (n) {
this.sounds[n].output.connect(this.bg);
if (this.active && this.active !== this.sounds[n]) {
this.active.fadeOut(2);
}
this.active = this.sounds[n];
this.active.loop();
}
AudioManager.prototype.playCue = function (n) {
var sound = this.sounds[n];
sound.output.connect(this.cue);
sound.output.foo = 'cue';
console.log(sound.getDuration());
this.bg.gain.exponentialRampToValueAtTime(.3, context.currentTime + .3);
this.bg.gain.exponentialRampToValueAtTime(1, context.currentTime + sound.getDuration() + .5);
console.log('playCue');
sound.play();
}
function setBg(n) {
return function () {
audio.setBg(n);
}
}
function BufferLoader(context, urlList, callback) {
this.context = context;
this.urlList = urlList;
this.onload = callback;
this.bufferList = new Array();
this.loadCount = 0;
}
BufferLoader.prototype.loadBuffer = function(url, index) {
// Load buffer asynchronously
var request = new XMLHttpRequest();
request.open("GET", url, true);
request.responseType = "arraybuffer";
var loader = this;
request.onload = function() {
// Asynchronously decode the audio file data in request.response
loader.context.decodeAudioData(
request.response,
function(buffer) {
if (!buffer) {
alert('error decoding file data: ' + url);
return;
}
loader.bufferList[index] = buffer;
if (++loader.loadCount == loader.urlList.length)
loader.onload(loader.bufferList);
},
function(error) {
console.error('decodeAudioData error', error);
}
);
}
request.onerror = function() {
alert('BufferLoader: XHR error');
}
request.send();
}
BufferLoader.prototype.load = function() {
for (var i = 0; i < this.urlList.length; ++i)
this.loadBuffer(this.urlList[i], i);
}
window.onload = init;
</script>
</body>
</html>