third_party/WebKit/LayoutTests/webaudio/audiobuffersource-detune-modulation.html

   1 <!DOCTYPE html>
   2 <html>
   3
   4 <head>
   5   <script src="../resources/js-test.js"></script>
   6   <script src="resources/compatibility.js"></script>
   7   <script src="resources/audio-testing.js"></script>
   8   <script src="resources/audiobuffersource-testing.js"></script>
   9   <script src="resources/buffer-loader.js"></script>
  10 </head>
  11
  12 <body>
  13   <script>
  14     description('AudioBufferSourceNode: oscillator-driven detune modulation.');
  15     window.jsTestIsAsync = true;
  16
  17     var sampleRate = 44100;
  18     var duration = 0.25;
  19
  20     var context = new OfflineAudioContext(1, sampleRate * duration, sampleRate);
  21     var referenceBuffer;
  22
  23     var audit = Audit.createTaskRunner();
  24
  25     // Task: Load the reference file asynchronously. In order to create a new
  26     // reference file, use the task 'generate-reference' below.
  27     audit.defineTask('load-reference', function (done) {
  28       var loader = new BufferLoader(context, [
  29         'audiobuffersource-detune-modulation-expected.wav'
  30         ], function (bufferList) {
  31           referenceBuffer = bufferList[0];
  32           done();
  33         });
  34
  35       loader.load();
  36     });
  37
  38
  39     // Task: Render the actual buffer and compare with the reference.
  40     audit.defineTask('generate-verify', function (done) {
  41
  42       // With this setting, the detune will be changing continuously and
  43       // repeatedly within the range of [-1200, 1200] around 440Hz, based on the
  44       // input from the oscillator.
  45       createSawtoothWithModulation(context, 'detune', 440, 1200);
  46
  47       context.startRendering().then(function (renderedBuffer) {
  48         var actual = renderedBuffer.getChannelData(0);
  49         var expected = referenceBuffer.getChannelData(0);
  50
  51         // Compare two buffers with arbitrary (yet reasonable) constraints.
  52         // There parameters are determined by try bot experiments.
  53         compareBuffersWithConstraints(actual, expected, {
  54           thresholdSNR: 93.31,
  55           thresholdDiffULP: 1.01,
  56           thresholdDiffCount: 0,
  57           bitDepth: 16
  58         });
  59
  60       }).then(done);
  61     });
  62
  63     // Task: Create a new reference audio file. See .runTasks() below to run
  64     // this task.
  65     audit.defineTask('generate-reference', function (done) {
  66       if (!window.testRunner) {
  67         done();
  68         return;
  69       }
  70
  71       // With this setting, the detune will be changing continuously and
  72       // repeatedly within the range of [-1200, 1200] around 440Hz, based on the
  73       // input from the oscillator.
  74       createSawtoothWithModulation(context, 'detune', 440, 1200);
  75
  76       // |finishAudioTest| will automatically create a reference audio file from
  77       // the OAC rendering if the reference file does not exist.
  78       context.oncomplete = finishAudioTest;
  79       context.startRendering();
  80       testRunner.waitUntilDone();
  81
  82       done();
  83     });
  84
  85     audit.defineTask('finish', function (done) {
  86       finishJSTest();
  87       done();
  88     });
  89
  90     window.onload = function () {
  91       audit.runTasks(
  92         'load-reference',
  93         'generate-verify',
  94         'finish'
  95       );
  96     };
  97
  98     // Use this task to generate a new reference audio file. Make sure to
  99     // comment out .runTasks() above before use this.
 100     // audit.runTasks('generate-reference');
 101
 102     successfullyParsed = true;
 103   </script>
 104 </body>
 105
 106 </html>