audiobuffersource-loop-short-duration.html

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This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-loop-short-duration.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>

      audiobuffersource-loop-short-duration.html

    </title>

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

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

  </head>

  <body>

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

      promise_test(async () => {

        let sampleRate = 48000;

        let context = new OfflineAudioContext(1, 128, sampleRate);

        let buffer = context.createBuffer(1, 10, sampleRate);

        let data = buffer.getChannelData(0);

        for (let i = 0; i < 10; ++i) {

          data[i] = 1.0;

        let source = context.createBufferSource();

        source.buffer = buffer;

        source.loop = true;

        // loopStart > duration

        source.loopStart = 5 / sampleRate;

        source.loopEnd = 8 / sampleRate;

        source.connect(context.destination);

        // Play only 2 frames (duration = 2/sampleRate)

        source.start(0, 0, 2 / sampleRate);

        let renderedBuffer = await context.startRendering();

        let renderedData = renderedBuffer.getChannelData(0);

        let expected = new Float32Array(128);

        expected[0] = 1.0;

        expected[1] = 1.0;

        assert_array_equals(

          renderedData,

          expected,

          'Rendered data should be exactly 2 frames of 1.0 followed by silence'

);

      }, 'audiobuffersource-loop-short-duration');

    </script>

  </body>

</html>