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<!DOCTYPE html>
<html>
<head>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="webaudio.js"></script>
<script type="text/javascript" src="layouttest-glue.js"></script>
<script type="text/javascript" src="blink/audio-testing.js"></script>
<script type="text/javascript" src="blink/convolution-testing.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script>
description("Tests ConvolverNode processing a mono channel with mono impulse response.");
SimpleTest.waitForExplicitFinish();
// To test the convolver, we convolve two square pulses together to
// produce a triangular pulse. To verify the result is correct we
// check several parts of the result. First, we make sure the initial
// part of the result is zero (due to the latency in the convolver).
// Next, the triangular pulse should match the theoretical result to
// within some roundoff. After the triangular pulse, the result
// should be exactly zero, but round-off prevents that. We make sure
// the part after the pulse is sufficiently close to zero. Finally,
// the result should be exactly zero because the inputs are exactly
// zero.
function runTest() {
if (window.testRunner) {
testRunner.dumpAsText();
testRunner.waitUntilDone();
}
window.jsTestIsAsync = true;
// Create offline audio context.
var context = new OfflineAudioContext(2, sampleRate * renderLengthSeconds, sampleRate);
var squarePulse = createSquarePulseBuffer(context, pulseLengthFrames);
var trianglePulse = createTrianglePulseBuffer(context, 2 * pulseLengthFrames);
var bufferSource = context.createBufferSource();
bufferSource.buffer = squarePulse;
var convolver = context.createConvolver();
convolver.normalize = false;
convolver.buffer = squarePulse;
bufferSource.connect(convolver);
convolver.connect(context.destination);
bufferSource.start(0);
context.oncomplete = checkConvolvedResult(trianglePulse);
context.startRendering();
}
function finishJSTest() {
SimpleTest.finish();
}
runTest();
successfullyParsed = true;
</script>
<script src="../fast/js/resources/js-test-post.js"></script>
</body>
</html>
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