test_convolverNode_mono_mono.html

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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) {

        window.testRunner.dumpAsText();

        window.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);

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runTest();

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