third_party/WebKit/LayoutTests/webaudio/audiobuffer.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <script src="../resources/js-test.js"></script>
   5 <script src="resources/audio-testing.js"></script>
   6 <script src="resources/compatibility.js"></script>
   7 </head>
   8 <body>
   9 <script>
  10 description("Basic tests for AudioBuffer.");
  11
  12 var sampleRate = 44100.0
  13 var lengthInSeconds = 2;
  14 var numberOfChannels = 4;
  15
  16 var context = new AudioContext();
  17 var buffer = context.createBuffer(numberOfChannels, sampleRate * lengthInSeconds, sampleRate);
  18
  19 if (buffer.sampleRate === sampleRate)
  20     testPassed("sampleRate has been set correctly.");
  21 else
  22     testFailed("sampleRate should be set correctly.");
  23
  24 if (buffer.length === sampleRate * lengthInSeconds)
  25     testPassed("length has been set correctly.");
  26 else
  27     testFailed("length should be set correctly");
  28
  29 if (buffer.duration === lengthInSeconds)
  30     testPassed("duration has been set correctly.");
  31 else
  32     testFailed("duration should be set correctly.");
  33
  34 if (buffer.numberOfChannels === numberOfChannels)
  35     testPassed("numberOfChannels has been set correctly.");
  36 else
  37     testFailed("numberOfChannels should be set correctly.");
  38
  39 for (var index = 0; index < buffer.numberOfChannels; ++index) {
  40     if (buffer.getChannelData(index) instanceof window.Float32Array)
  41         testPassed("getChannelData(" + index + ") returns a Float32Array object.");
  42     else
  43         testFailed("getChannelData(" + index + ") should return a Float32Array object.");
  44 }
  45
  46 try {
  47     buffer.getChannelData(buffer.numberOfChannels);
  48     testFailed("Exception should be thrown when index is not less than numberOfChannels.");
  49 } catch(e) {
  50     testPassed("Exception has been thrown correctly when index is not less than numberOfChannels.");
  51 }
  52
  53 var buffer2 = context.createBuffer(1, 1000, 24576);
  54 var expectedDuration = 1000/24576;
  55
  56 if (buffer2.duration == expectedDuration)
  57     testPassed("duration has expected accuracy.");
  58 else
  59     testFailed("duration is " + buffer2.duration + " sec instead of " + expectedDuration + " sec.");
  60 </script>
  61
  62 </body>
  63 </html>