third_party/WebKit/LayoutTests/webaudio/test-basic.html

   1 <!DOCTYPE html>
   2
   3 <!--
   4 This is a very basic test to make sure testRunner.setAudioData() works correctly.
   5 It generates a 2 seconds long stereo result @44.1KHz
   6 The left channel will be a 880Hz tone, while the right will be 440Hz.
   7 -->
   8
   9 <html>
  10 <head>
  11 <script src="../resources/js-test.js"></script>
  12 <script type="text/javascript" src="resources/audio-testing.js"></script>
  13
  14 </head>
  15 <body>
  16
  17 <div id="description"></div>
  18 <div id="console"></div>
  19
  20 <script>
  21 description("Tests basic audio test infrastructure: specifically testRunner.setAudioData()");
  22
  23 var sampleRate = 44100.0;
  24 var lengthInSeconds = 2;
  25
  26 function generateSinWave(audioBuffer) {
  27     var n = audioBuffer.length;
  28     var channelL = audioBuffer.getChannelData(0);
  29     var channelR = audioBuffer.getChannelData(1);
  30     var sampleRate = audioBuffer.sampleRate;
  31
  32     for (var i = 0; i < n; ++i) {
  33         channelL[i] = Math.sin(880.0 * 2.0*Math.PI * i / sampleRate);
  34         channelR[i] = Math.sin(440.0 * 2.0*Math.PI * i / sampleRate);
  35     }
  36 }
  37
  38 function runTest() {
  39     if (!window.testRunner)
  40         return;
  41
  42     var context = new AudioContext();
  43     var audioBuffer = context.createBuffer(2, lengthInSeconds * sampleRate, sampleRate);
  44
  45     generateSinWave(audioBuffer);
  46
  47     var audioData = createAudioData(audioBuffer);
  48     testRunner.setAudioData(audioData);
  49
  50     testRunner.notifyDone();
  51 }
  52
  53 runTest();
  54
  55 </script>
  56
  57
  58 <body>
  59 </body>
  60 </html>