test_nodeToParamConnection.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test connecting an AudioNode to an AudioParam</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: 2048,

  createGraph(context) {

    var sourceBuffer = context.createBuffer(2, 2048, context.sampleRate);

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

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

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

    var paramSource = context.createBufferSource();

    paramSource.buffer = this.buffer;

    var source = context.createBufferSource();

    source.buffer = sourceBuffer;

    var gain = context.createGain();

    paramSource.connect(gain.gain);

    source.connect(gain);

    paramSource.start(0);

    source.start(0);

    return gain;

},

  createExpectedBuffers(context) {

    this.buffer = context.createBuffer(2, 2048, context.sampleRate);

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

      for (var j = 0; j < 2; ++j) {

        this.buffer.getChannelData(j)[i] = Math.sin(440 * 2 * (j + 1) * Math.PI * i / context.sampleRate);

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

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

      expectedBuffer.getChannelData(0)[i] = 1 + (this.buffer.getChannelData(0)[i] + this.buffer.getChannelData(1)[i]) / 2;

      expectedBuffer.getChannelData(1)[i] = -(1 + (this.buffer.getChannelData(0)[i] + this.buffer.getChannelData(1)[i]) / 2);

    return expectedBuffer;

},

};

runTest();

</script>

</pre>

</body>

</html>