test_convolverNodeChannelCount.html

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<head>

  <title>Test ConvolverNode channel count</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">

const signalLength = 2048;

const responseLength = 1000;

const outputLength = 2048; // < signalLength + responseLength to test bug 910171

var gTest = {

  length: outputLength,

  numberOfChannels: 2,

  createGraph(context) {

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

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

      var sample = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);

      // When mixed into a single channel, this produces silence

      buffer.getChannelData(0)[i] = sample;

      buffer.getChannelData(1)[i] = -sample;

    var response = context.createBuffer(2, responseLength, context.sampleRate);

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

      response.getChannelData(0)[i] = i / responseLength;

      response.getChannelData(1)[i] = 1 - (i / responseLength);

    var convolver = context.createConvolver();

    convolver.buffer = response;

    convolver.channelCount = 1;

    expectException(function() { convolver.channelCount = 3; },

                    DOMException.NOT_SUPPORTED_ERR);

    convolver.channelCountMode = "explicit";

    expectException(function() { convolver.channelCountMode = "max"; },

                    DOMException.NOT_SUPPORTED_ERR);

    convolver.channelInterpretation = "discrete";

    convolver.channelInterpretation = "speakers";

    var source = context.createBufferSource();

    source.buffer = buffer;

    source.connect(convolver);

    source.start(0);

    return convolver;

},

};

runTest();

</script>

</pre>

</body>

</html>