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eq.html
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eq.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0"/>
<meta name="format-detection" content="telephone=no"/>
<title>均衡器（BiquadFilter）</title>
<style>
.filter label {
width: 50px;
display: inline-block;
height: 25px;
line-height: 25px;
}
.filter input {
width: 150px;
vertical-align: middle;
}
.filter em {
font-style: normal;
color: #ff4500;
}
</style>
</head>
<body>
<h1>均衡器（BiquadFilter）</h1>
<div id="eq">
<section class="filter">
<label for="filter1">32HZ</label>
<input id="filter1" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db1">0</em>db</span>
</section>
<section class="filter">
<label for="filter2">63HZ</label>
<input id="filter2" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db2">0</em>db</span>
</section>
<section class="filter">
<label for="filter3">125HZ</label>
<input id="filter3" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db3">0</em>db</span>
</section>
<section class="filter">
<label for="filter4">250HZ</label>
<input id="filter4" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db4">0</em>db</span>
</section>
<section class="filter">
<label for="filter5">500HZ</label>
<input id="filter5" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db5">0</em>db</span>
</section>
<section class="filter">
<label for="filter6">1kHZ</label>
<input id="filter6" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db6">0</em>db</span>
</section>
<section class="filter">
<label for="filter7">2kHZ</label>
<input id="filter7" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db7">0</em>db</span>
</section>
<section class="filter">
<label for="filter8">4kHZ</label>
<input id="filter8" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db8">0</em>db</span>
</section>
<section class="filter">
<label for="filter9">8kHZ</label>
<input id="filter9" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db9">0</em>db</span>
</section>
<section class="filter">
<label for="filter10">16kHZ</label>
<input id="filter10" type="range" value="0" step="1"
max="30" min="-30">
<span><em id="db10">0</em>db</span>
</section>
</div>
<p>
<input type="button" id="play" disabled value="加载中..."/>
</p>
<script type="text/javascript" src="sound.js"></script>
<script type="text/javascript">
var Ctx = window.webkitAudioContext ? window.webkitAudioContext : window.AudioContext;
var ctx = new Ctx();
(function () {
var freqs = [32, 63, 125, 250, 500, 1000, 2000, 4000, 8000, 16000];
var biquads = [];
var i;
for (i = 0; i < 10; i ++) {
biquads[i] = ctx.createBiquadFilter();
biquads[i].type = 5; // 'peaking';
biquads[i].frequency.value = freqs[i];
biquads[i].Q.value = 1.4;
biquads[i].gain.value = 0;
}
for (i = 1; i < 10; i ++) {
biquads[i-1].connect(biquads[i]);
}
biquads[9].connect(ctx.destination);
for (i = 0; i < 10; i ++) {
document.getElementById('filter' + (i+1)).onchange = (function (k){
return function () {
biquads[k].gain.value = parseInt(this.value);
document.getElementById('db' + (k+1)).innerHTML = this.value;
};
})(i);
}
var loadedCallback = function(){
document.getElementById('play').removeAttribute('disabled');
document.getElementById('play').value = '播放';
};
var gangnam = new Sound(ctx);
gangnam.setOutput(biquads[0]);
//gangnam.load('res/gangnam_style_clip.mp3', loadedCallback);
//gangnam.setLoop(5.106, 12.386);
gangnam.load('res/beir_shuang_chip.mp3', loadedCallback);
gangnam.setLoop(1.755, 12.813);
document.getElementById('play').onclick = function () {
gangnam.play();
document.getElementById('play').setAttribute('disabled', 'disabled');
};
})();
</script>
</body>
</html>