test_channelMergerNodeWithVolume.html

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<html>

<head>

  <title>Test ChannelMergerNode</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,

  numberOfChannels: 6,

  createGraph(context) {

    var buffers = [];

    for (var j = 0; j < 6; ++j) {

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

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

        buffer.getChannelData(0)[i] = Math.sin(440 * 2 * (j + 1) * Math.PI * i / context.sampleRate);

        // Second channel is silent

      buffers.push(buffer);

    var merger = context.createChannelMerger();

    is(merger.channelCount, 1, "merger node has 1 input channels");

    is(merger.channelCountMode, "explicit", "Correct channelCountMode for the merger node");

    is(merger.channelInterpretation, "speakers", "Correct channelCountInterpretation for the merger node");

    for (var i = 0; i < 6; ++i) {

      var source = context.createBufferSource();

      source.buffer = buffers[i];

      var gain = context.createGain();

      gain.gain.value = 0.5;

      source.connect(gain);

      gain.connect(merger, 0, i);

      source.start(0);

    return merger;

},

  createExpectedBuffers(context) {

    var expectedBuffer = context.createBuffer(6, 2048, context.sampleRate);

    for (var i = 0; i < 6; ++i) {

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

        expectedBuffer.getChannelData(i)[j] = 0.5 * 0.5 * Math.sin(440 * 2 * (i + 1) * Math.PI * j / context.sampleRate);

    return expectedBuffer;

},

};

runTest();

</script>

</pre>

</body>

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