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

      // Play a long DC signal out through an AudioGainNode and for each time
      // interval call setValueCurveAtTime() to set the values for the duration
      // of the interval.  Each curve is a sine wave, and we assume that the
      // time interval is not an exact multiple of the period. This causes a
      // discontinuity between time intervals which is used to test timing.

      // Number of tests to run.
      let numberOfTests = 20;

      // Max allowed difference between the rendered data and the expected
      // result. Because of the linear interpolation, the rendered curve isn't
      // exactly the same as the reference.  This value is experimentally
      // determined.
      let maxAllowedError = 3.7194e-6;

      // The amplitude of the sine wave.
      let sineAmplitude = 1;

      // Frequency of the sine wave.
      let freqHz = 440;

      // Curve to use for setValueCurveAtTime().
      let curve;

      // Sets the curve data for the entire time interval.
      function automation(value, startTime, endTime) {
        gainNode.gain.setValueCurveAtTime(
            curve, startTime, endTime - startTime);
      }

      audit.define(
          {
            label: 'test',
            description: 'AudioParam setValueCurveAtTime() functionality.'
          },
          function(task, should) {
            // The curve of values to use.
            curve = createSineWaveArray(
                timeInterval, freqHz, sineAmplitude, sampleRate);

            createAudioGraphAndTest(
                task, should, numberOfTests, sineAmplitude,
                function(k) {
                  // Don't need to set the value.
                },
                automation, 'setValueCurveAtTime()', maxAllowedError,
                createReferenceSineArray,
                2 * Math.PI * sineAmplitude * freqHz / sampleRate,
                differenceErrorMetric);
          });

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