LayoutTests/webaudio/audioparam-setValueAtTime.html

   1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   2 <html>
   3 <head>
   4 <script src="resources/audio-testing.js"></script>
   5 <script src="resources/audioparam-testing.js"></script>
   6 <script src="../fast/js/resources/js-test-pre.js"></script>
   7 </head>
   8
   9 <body>
  10 <div id="description"></div>
  11 <div id="console"></div>
  12
  13 <script>
  14 description("Test AudioParam setValueAtTime() functionality.");
  15
  16 // Play a long DC signal out through an AudioGainNode, and call setValueAtTime() at regular
  17 // intervals to set the value for the duration of the interval.  Each time interval has
  18 // different value so that there is a discontinuity at each time interval boundary.  The
  19 // discontinuity is for testing timing.
  20
  21 // Number of tests to run.
  22 var numberOfTests = 100;
  23
  24 // Max allowed difference between the rendered data and the expected result.
  25 var maxAllowedError = 6e-8;
  26
  27 // Set the gain node value to the specified value at the specified time.
  28 function setValue(value, time)
  29 {
  30     gainNode.gain.setValueAtTime(value, time);
  31 }
  32
  33 // For testing setValueAtTime(), we don't need to do anything for automation. because the value at
  34 // the beginning of the interval is set by setValue and it remains constant for the duration, which
  35 // is what we want.
  36 function automation(value, startTime, endTime)
  37 {
  38     // Do nothing.
  39 }
  40
  41 function runTest()
  42 {
  43     createAudioGraphAndTest(numberOfTests,
  44                             1,
  45                             setValue,
  46                             automation,
  47                             "setValueAtTime()",
  48                             maxAllowedError,
  49                             createConstantArray);
  50 }
  51
  52 runTest();
  53 successfullyParsed = true;
  54
  55 </script>
  56
  57 <script src="../fast/js/resources/js-test-post.js"></script>
  58 </body>
  59 </html>