third_party/WebKit/LayoutTests/webaudio/audioparam-setValueAtTime.html

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