test_delayNodeWithGain.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test DelayNode with a GainNode</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

</head>

<body>

<pre id="test">

<script src="webaudio.js" type="text/javascript"></script>

<script class="testbody" type="text/javascript">

var gTest = {

  length: 4096,

  numberOfChannels: 1,

  createGraph(context) {

    var buffer = context.createBuffer(1, 2048, context.sampleRate);

    for (var i = 0; i < 2048; ++i) {

      buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);

    var source = context.createBufferSource();

    var delay = context.createDelay();

    source.buffer = buffer;

    var gain = context.createGain();

    gain.gain.value = 0.5;

    source.connect(gain);

    gain.connect(delay);

    // Delay the source stream by 2048 frames

    delay.delayTime.value = 2048 / context.sampleRate;

    source.start(0);

    return delay;

},

  createExpectedBuffers(context) {

    var expectedBuffer = context.createBuffer(1, 2048 * 2, context.sampleRate);

    for (var i = 2048; i < 2048 * 2; ++i) {

      expectedBuffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * (i - 2048) / context.sampleRate) / 2;

    return expectedBuffer;

},

};

runTest();

</script>

</pre>

</body>

</html>