File: detune-overflow.html

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<!doctype html>
<html>
  <head>
    <title>Test Osc.detune Overflow</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/webaudio/resources/audit.js"></script>
    <script src="/webaudio/resources/audit-util.js"></script>
  </head>

  <body>
    <script>
      const sampleRate = 44100;
      const renderLengthFrames = RENDER_QUANTUM_FRAMES;

      let audit = Audit.createTaskRunner();

      audit.define('detune overflow', async (task, should) => {
        let context =
            new OfflineAudioContext(1, renderLengthFrames, sampleRate);

        // This value of frequency and detune results in a computed frequency of
        // 440*2^(153600/1200) = 1.497e41.  The frequency needs to be clamped to
        // Nyquist.  But a sine wave at Nyquist frequency is all zeroes.  Verify
        // the output is 0.
        let osc = new OscillatorNode(context, {frequency: 440, detune: 153600});

        osc.connect(context.destination);

        let buffer = await context.startRendering();
        let output = buffer.getChannelData(0);
        should(output, 'Osc freq and detune outside nominal range')
            .beConstantValueOf(0);

        task.done();
      });

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