audiobuffer.html - mozsearch

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

<!DOCTYPE html>

<html>

<head>

  <title>AudioBuffer API Test</title>

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

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

</head>

<body>

  <script>

    const sampleRate = 44100.0;

    const lengthInSeconds = 2;

    const numberOfChannels = 4;

    test(() => {

      const buffer = new AudioBuffer({

        numberOfChannels,

        length: sampleRate * lengthInSeconds,

        sampleRate

});

      assert_true(

          true,

          `buffer = new AudioBuffer({numberOfChannels: ${numberOfChannels}, ` +

              `length: ${sampleRate * lengthInSeconds}, ` +

                  `sampleRate: ${sampleRate}})`);

      assert_equals(buffer.sampleRate, sampleRate, 'buffer.sampleRate');

      assert_equals(

          buffer.length, sampleRate * lengthInSeconds, 'buffer.length');

      assert_equals(buffer.duration, lengthInSeconds, 'buffer.duration');

      assert_equals(

          buffer.numberOfChannels, numberOfChannels, 'buffer.numberOfChannels');

      for (let i = 0; i < buffer.numberOfChannels; ++i) {

        assert_true(

            buffer.getChannelData(i) instanceof Float32Array,

            `buffer.getChannelData(${i}) instanceof Float32Array`);

      assert_throws_dom(

          'IndexSizeError',

          () => buffer.getChannelData(buffer.numberOfChannels),

          `buffer.getChannelData(${buffer.numberOfChannels}) throws`);

      // Non-standard values (1000 & 24576) to test edge-case duration behavior.

      const testSampleRate = 24576;

      const testLength = 1000;

      const buffer2 = new AudioBuffer({

        numberOfChannels: 1,

        length: testLength,

        sampleRate: testSampleRate

});

      const expectedDuration = testLength / testSampleRate;

      assert_equals(

          buffer2.duration,

          expectedDuration,

          'new AudioBuffer({numberOfChannels: 1,\n' +

              `length: ${testLength},sampleRate: ${testSampleRate}}).duration`);

    }, 'AudioBuffer: creation and property validation');

  </script>

</body>

</html>