third_party/WebKit/LayoutTests/webaudio/realtimeanalyser-fft-sizing.html

   1 <!DOCTYPE html>
   2
   3 <html>
   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 </head>
   9
  10 <body>
  11 <div id="description"></div>
  12 <div id="console"></div>
  13
  14 <script>
  15 description("Test that re-sizing the FFT arrays does not fail.");
  16
  17 if (window.testRunner) {
  18     testRunner.dumpAsText();
  19     testRunner.waitUntilDone();
  20 }
  21
  22 var doTest = function(fftSize, illegal) {
  23     var c = new OfflineAudioContext(1, 1000, 44100);
  24     var a = c.createAnalyser();
  25     try {
  26         a.fftSize = fftSize;
  27         if (illegal)
  28            testFailed("No exception thrown for illegal fftSize " + fftSize + ".");
  29         else
  30            testPassed("Successfully set legal fftSize " +  fftSize + ".");
  31     } catch(e) {
  32         testPassed("Exception thrown for illegal fftSize " + fftSize + ".");
  33     }
  34     // This arbitrary size does not affect the correctness of the test.
  35     var arr = new Float32Array(100);
  36     a.getFloatFrequencyData(arr);
  37 }
  38
  39 doTest(-1, true);
  40 doTest(0, true);
  41 doTest(1, true);
  42 for (var i = 2; i <= 0x20000; i *= 2) {
  43         if (i >= 32 && i <= 32768)
  44         doTest(i, false);
  45     else
  46         doTest(i, true);
  47     doTest(i + 1, true);
  48 }
  49
  50 if (window.testRunner)
  51     testRunner.notifyDone();
  52 testPassed("AudioContext survived multiple invalid FFT array resizings.");
  53 </script>
  54
  55 </body>
  56 </html>