convolution-mono-mono.html

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This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-convolvernode-interface/convolution-mono-mono.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>

      convolution-mono-mono.html

    </title>

    <script src="/resources/testharness.js"></script>

    <script src="/resources/testharnessreport.js"></script>

    <script src="/webaudio/resources/audit-util.js"></script>

    <script src="/webaudio/resources/audit.js"></script>

    <script src="/webaudio/resources/convolution-testing.js"></script>

  </head>

  <body>

    <script id="layout-test-code">

      let audit = Audit.createTaskRunner();

      // description("Tests ConvolverNode processing a mono channel with mono

      // impulse response.");

      // 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.

      audit.define('test', function(task, should) {

        // Create offline audio context.

        let context = new OfflineAudioContext(

            2, sampleRate * renderLengthSeconds, sampleRate);

        let squarePulse = createSquarePulseBuffer(context, pulseLengthFrames);

        let trianglePulse =

            createTrianglePulseBuffer(context, 2 * pulseLengthFrames);

        let bufferSource = context.createBufferSource();

        bufferSource.buffer = squarePulse;

        let convolver = context.createConvolver();

        convolver.normalize = false;

        convolver.buffer = squarePulse;

        bufferSource.connect(convolver);

        convolver.connect(context.destination);

        bufferSource.start(0);

        context.startRendering()

            .then(buffer => {

              checkConvolvedResult(buffer, trianglePulse, should);

})

            .then(task.done.bind(task));

});

      audit.run();

    </script>

  </body>

</html>