test_gainNodeInLoop.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test GainNode in presence of loops</title>

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

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

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

</head>

<body>

<pre id="test">

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

var gTest = {

  length: 4096,

  numberOfChannels: 1,

  createGraph(context) {

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

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

      sourceBuffer.getChannelData(0)[i] = 1;

    var source = context.createBufferSource();

    source.buffer = sourceBuffer;

    source.loop = true;

    source.start(0);

    source.stop(sourceBuffer.duration * 2);

    var gain = context.createGain();

    // Adjust the gain in a way that we don't just end up modifying AudioChunk::mVolume

    gain.gain.setValueAtTime(0.5, 0);

    source.connect(gain);

    return gain;

},

  createExpectedBuffers(context) {

    var expectedBuffer = context.createBuffer(1, 4096, context.sampleRate);

    for (var i = 0; i < 4096; ++i) {

      expectedBuffer.getChannelData(0)[i] = 0.5;

    return expectedBuffer;

},

};

runTest();

</script>

</pre>

</body>

</html>