audioparam-exponentialRampToValueAtTime.html

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-audioparam-interface/audioparam-exponentialRampToValueAtTime.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>

      Test AudioParam.exponentialRampToValueAtTime

    </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 exponentialRampToValueAtTime() at regular

      // intervals to set the starting and ending values for an exponential

      // ramp.  Each time interval has a ramp with a different starting and

      // ending 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 = 1.222e-5;

      // 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 ramp ending at time |endTime| with an ending

      // value of |value|.

      function generateRamp(value, startTime, endTime){

          // |startTime| is ignored because the exponential ramp

          // uses the value from the setValueAtTime() call above.

          gainNode.gain.exponentialRampToValueAtTime(value, endTime)}

      audit.define(

            label: 'test',

            description:

                'AudioParam exponentialRampToValueAtTime() functionality'

},

          function(task, should) {

            createAudioGraphAndTest(

                task, should, numberOfTests, initialValue, setValue,

                generateRamp, 'exponentialRampToValueAtTime()', maxAllowedError,

                createExponentialRampArray);

});

      audit.run();

    </script>

  </body>

</html>