<!DOCTYPE HTML>
<html>
<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>
