audiobuffersource-start.html | Explore in Territory

<!DOCTYPE html>
<html>
  <head>
    <title>
      audiobuffersource-start.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/audiobuffersource-testing.js"></script>
  </head>
  <body>
    <script id="layout-test-code">
      let audit = Audit.createTaskRunner();

      // The following test cases assume an AudioBuffer of length 8 whose PCM
      // data is a linear ramp, 0, 1, 2, 3,...

      let tests = [

        {
          description:
              'start(when): implicitly play whole buffer from beginning to end',
          offsetFrame: 'none',
          durationFrames: 'none',
          renderFrames: 16,
          playbackRate: 1,
          expected: [0, 1, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0]
        },

        {
          description:
              'start(when, 0): play whole buffer from beginning to end explicitly giving offset of 0',
          offsetFrame: 0,
          durationFrames: 'none',
          renderFrames: 16,
          playbackRate: 1,
          expected: [0, 1, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0]
        },

        {
          description:
              'start(when, 0, 8_frames): play whole buffer from beginning to end explicitly giving offset of 0 and duration of 8 frames',
          offsetFrame: 0,
          durationFrames: 8,
          renderFrames: 16,
          playbackRate: 1,
          expected: [0, 1, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0]
        },

        {
          description:
              'start(when, 4_frames): play with explicit non-zero offset',
          offsetFrame: 4,
          durationFrames: 'none',
          renderFrames: 16,
          playbackRate: 1,
          expected: [4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
        },

        {
          description:
              'start(when, 4_frames, 4_frames): play with explicit non-zero offset and duration',
          offsetFrame: 4,
          durationFrames: 4,
          renderFrames: 16,
          playbackRate: 1,
          expected: [4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
        },

        {
          description:
              'start(when, 7_frames): play with explicit non-zero offset near end of buffer',
          offsetFrame: 7,
          durationFrames: 1,
          renderFrames: 16,
          playbackRate: 1,
          expected: [7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
        },

        {
          description:
              'start(when, 8_frames): play with explicit offset at end of buffer',
          offsetFrame: 8,
          durationFrames: 0,
          renderFrames: 16,
          playbackRate: 1,
          expected: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
        },

        {
          description:
              'start(when, 9_frames): play with explicit offset past end of buffer',
          offsetFrame: 8,
          durationFrames: 0,
          renderFrames: 16,
          playbackRate: 1,
          expected: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
        },

        // When the duration exceeds the buffer, just play to the end of the
        // buffer. (This is different from the case when we're looping, which is
        // tested in loop-comprehensive.)
        {
          description:
              'start(when, 0, 15_frames): play with whole buffer, with long duration (clipped)',
          offsetFrame: 0,
          durationFrames: 15,
          renderFrames: 16,
          playbackRate: 1,
          expected: [0, 1, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0]
        },

        // Enable test when AudioBufferSourceNode hack is fixed:
        // https://bugs.webkit.org/show_bug.cgi?id=77224 { description:
        // "start(when, 3_frames, 3_frames): play a middle section with explicit
        // offset and duration",
        //   offsetFrame: 3, durationFrames: 3, renderFrames: 16, playbackRate:
        //   1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },

      ];

      let sampleRate = 44100;
      let buffer;
      let bufferFrameLength = 8;
      let testSpacingFrames = 32;
      let testSpacingSeconds = testSpacingFrames / sampleRate;
      let totalRenderLengthFrames = tests.length * testSpacingFrames;

      function runLoopTest(context, testNumber, test) {
        let source = context.createBufferSource();

        source.buffer = buffer;
        source.playbackRate.value = test.playbackRate;

        source.connect(context.destination);

        // Render each test one after the other, spaced apart by
        // testSpacingSeconds.
        let startTime = testNumber * testSpacingSeconds;

        if (test.offsetFrame == 'none' && test.durationFrames == 'none') {
          source.start(startTime);
        } else if (test.durationFrames == 'none') {
          let offset = test.offsetFrame / context.sampleRate;
          source.start(startTime, offset);
        } else {
          let offset = test.offsetFrame / context.sampleRate;
          let duration = test.durationFrames / context.sampleRate;
          source.start(startTime, offset, duration);
        }
      }

      audit.define(
          'Tests AudioBufferSourceNode start()', function(task, should) {
            // Create offline audio context.
            let context =
                new OfflineAudioContext(1, totalRenderLengthFrames, sampleRate);
            buffer = createTestBuffer(context, bufferFrameLength);

            for (let i = 0; i < tests.length; ++i)
              runLoopTest(context, i, tests[i]);

            context.startRendering().then(function(audioBuffer) {
              checkAllTests(audioBuffer, should);
              task.done();
            });
          });

      audit.run();
    </script>
  </body>
</html>
chromium/third_party/blink/web_tests/external/wpt/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-start.html
