<!DOCTYPE html>
<html>
  <head>
    <title>
      Test AudioParam.setTargetAtTime
    </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 call
      // setValueAtTime() and setTargetAtTime at regular intervals to set the
      // starting value and the target value. Each time interval has a ramp with
      // a different starting and target value so that there is a discontinuity
      // at each time interval boundary. The discontinuity is for testing
      // timing.  Also, we alternate between an increasing and decreasing ramp
      // for each interval.

      // Number of tests to run.
      let numberOfTests = 100;

      // Max allowed difference between the rendered data and the expected
      // result.
      let maxAllowedError = 6.5683e-4

      // The AudioGainNode starts with this value instead of the default value.
      let initialValue = 100;

      // Set the gain node value to the specified value at the specified time.
      function setValue(value, time) {
        gainNode.gain.setValueAtTime(value, time);
      }

      // Generate an exponential approach starting at |startTime| with a target
      // value of |value|.
      function automation(value, startTime, endTime){
          // endTime is not used for setTargetAtTime.
          gainNode.gain.setTargetAtTime(value, startTime, timeConstant)}

      audit.define(
          {
            label: 'test',
            description: 'AudioParam setTargetAtTime() functionality.'
          },
          function(task, should) {
            createAudioGraphAndTest(
                task, should, numberOfTests, initialValue, setValue, automation,
                'setTargetAtTime()', maxAllowedError,
                createExponentialApproachArray);
          });

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