third_party/WebKit/LayoutTests/webaudio/realtimeanalyser-float-data.html

   1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   2 <html>
   3   <head>
   4     <script src="../resources/js-test.js"></script>
   5     <script src="resources/compatibility.js"></script>
   6     <script src="resources/audio-testing.js"></script>
   7   </head>
   8
   9   <body>
  10     <div id="description"></div>
  11     <div id="console"></div>
  12
  13     <script>
  14       description("Test AnalyserNode getFloatTimeDomainData");
  15
  16       var sampleRate = 44100;
  17       // Render length and FFT length. Hence this must be a power of two.
  18       var sampleFrameLength = 2048;
  19
  20       var src;
  21       var analyser;
  22       var renderedData;
  23
  24       function checkResult() {
  25           var fftSize = analyser.fftSize;
  26           renderedData = new Float32Array(fftSize);
  27           analyser.getFloatTimeDomainData(renderedData);
  28
  29           var trueData = src.buffer.getChannelData(0);
  30           var success = true;
  31
  32           // Verify that the received time domain data is exactly equal to the actual time domain
  33           // data. This is true only because the render length and FFT size are the same.
  34           for (k = 0; k < fftSize; ++k) {
  35               if (trueData[k] != renderedData[k]) {
  36                   testFailed("Data mismatch at index " + k
  37                              + ".  Expected " + trueData[k]
  38                              + " but got " + renderedData[k]
  39                              + ".");
  40                   success = false;
  41                   break;
  42               }
  43           }
  44
  45           if (success) {
  46               testPassed("Received expected float time domain data.");
  47           } else {
  48               testFailed("Received float time domain data did not match expected result.");
  49           }
  50
  51           finishJSTest();
  52       }
  53
  54       function runTests() {
  55           if (window.testRunner) {
  56               testRunner.dumpAsText();
  57               testRunner.waitUntilDone();
  58           }
  59
  60           window.jsTestIsAsync = true;
  61
  62           context = new OfflineAudioContext(1, sampleFrameLength, sampleRate);
  63
  64           // Use a simple linear ramp as the source.
  65           src = context.createBufferSource();
  66           src.buffer = createLinearRampBuffer(context, sampleFrameLength);
  67
  68           analyser = context.createAnalyser();
  69           analyser.fftSize = sampleFrameLength;
  70
  71           src.connect(analyser);
  72           analyser.connect(context.destination);
  73           src.start();
  74
  75           context.oncomplete = checkResult;
  76           context.startRendering();
  77       }
  78
  79       runTests();
  80       successfullyParsed = true;
  81     </script>
  82   </body>
  83 </html>