third_party/WebKit/LayoutTests/webaudio/AudioBufferSource/audiosource-time-limits.html

<!DOCTYPE html>
<html>
  <head>
    <title>
      Test Scheduled Sources with Huge Time Limits
    </title>
    <script src="../../resources/testharness.js"></script>
    <script src="../../resources/testharnessreport.js"></script>
    <script src="../resources/audit-util.js"></script>
    <script src="../resources/audit.js"></script>
    <script src="../resources/audioparam-testing.js"></script>
  </head>
  <body>
    <script id="layout-test-code">
      let sampleRate = 48000;
      let renderFrames = 1000;

      let audit = Audit.createTaskRunner();

      audit.define('buffersource: huge stop time', (task, should) => {
        // We only need to generate a small number of frames for this test.
        let context = new OfflineAudioContext(1, renderFrames, sampleRate);
        let src = context.createBufferSource();

        // Constant source of amplitude 1, looping.
        src.buffer = createConstantBuffer(context, 1, 1);
        src.loop = true;

        // Create the graph and go!
        let endTime = 1e300;
        src.connect(context.destination);
        src.start();
        src.stop(endTime);

        context.startRendering()
            .then(function(resultBuffer) {
              let result = resultBuffer.getChannelData(0);
              should(
                  result, 'Output from AudioBufferSource.stop(' + endTime + ')')
                  .beConstantValueOf(1);
            })
            .then(() => task.done());
      });


      audit.define('oscillator: huge stop time', (task, should) => {
        // We only need to generate a small number of frames for this test.
        let context = new OfflineAudioContext(1, renderFrames, sampleRate);
        let src = context.createOscillator();

        // Create the graph and go!
        let endTime = 1e300;
        src.connect(context.destination);
        src.start();
        src.stop(endTime);

        context.startRendering()
            .then(function(resultBuffer) {
              let result = resultBuffer.getChannelData(0);
              // The buffer should not be empty.  Just find the max and verify
              // that it's not zero.
              let max = Math.max.apply(null, result);
              should(
                  max, 'Peak amplitude from oscillator.stop(' + endTime + ')')
                  .beGreaterThan(0);
            })
            .then(() => task.done());
      });


      audit.run();
    </script>
  </body>
</html>