convolver-cascade.html

Enable keyboard shortcuts

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

<!DOCTYPE html>

<html>

  <head>

    <title>

      Test Cascade of Mono Convolvers

    </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>

  </head>

  <body>

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

      let audit = Audit.createTaskRunner();

      // Arbitrary sample rate and reasonably short duration

      let sampleRate = 8000;

      let duration = 0.25;

      let renderFrames = duration * sampleRate;

      audit.define(

          {label: 'cascade-mono', description: 'Cascaded mono convolvers'},

          (task, should) => {

            // Cascade two convolvers with mono responses and verify that the

            // output is not silent.

            let context = new OfflineAudioContext(1, renderFrames, sampleRate);

            let b0 =

                new AudioBuffer({length: 5, sampleRate: context.sampleRate});

            b0.getChannelData(0)[1] = 1;

            let c0 = new ConvolverNode(

                context, {disableNormalization: true, buffer: b0});

            let b1 =

                new AudioBuffer({length: 5, sampleRate: context.sampleRate});

            b1.getChannelData(0)[2] = 1;

            let c1 = new ConvolverNode(

                context, {disableNormalization: true, buffer: b1});

            let src = new OscillatorNode(context);

            src.connect(c0).connect(c1).connect(context.destination);

            src.start();

            context.startRendering()

                .then(audioBuffer => {

                  // Just verify the output is not silent

                  let audio = audioBuffer.getChannelData(0);

                  should(audio, 'Output of cascaded mono convolvers')

                      .notBeConstantValueOf(0);

})

                .then(() => task.done());

});

      audit.run();

    </script>

  </body>

</html>