LayoutTests/webaudio/audiobuffersource-loop-comprehensive.html

   1 <!DOCTYPE html>
   2
   3 <html>
   4 <head>
   5 <link rel="stylesheet" href="../fast/js/resources/js-test-style.css"/>
   6 <script src="resources/audio-testing.js"></script>
   7 <script src="resources/audiobuffersource-testing.js"></script>
   8 <script src="../fast/js/resources/js-test-pre.js"></script>
   9 </head>
  10
  11 <body>
  12
  13 <div id="description"></div>
  14 <div id="console"></div>
  15
  16 <script>
  17 description("Tests AudioBufferSourceNode looping with a variety of loop points.");
  18
  19 // The following test cases assume an AudioBuffer of length 8 whose PCM data is a linear ramp, 0, 1, 2, 3,...
  20
  21 var tests = [
  22
  23 { description: "loop whole buffer by default with loopStart == loopEnd == 0",
  24   loopStartFrame: 0, loopEndFrame: 0, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },
  25
  26 { description: "loop whole buffer explicitly",
  27   loopStartFrame: 0, loopEndFrame: 8, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },
  28
  29 { description: "loop from middle to end of buffer",
  30   loopStartFrame: 4, loopEndFrame: 8, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,4,5,6,7,4,5,6,7] },
  31
  32 { description: "loop from start to middle of buffer",
  33   loopStartFrame: 0, loopEndFrame: 4, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,0,1,2,3,0,1,2,3,0,1,2,3] },
  34
  35 { description: "loop internally from 4 -> 6",
  36   loopStartFrame: 4, loopEndFrame: 6, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,4,5,4,5,4,5,4,5,4,5] },
  37
  38 { description: "loop internally from 3 -> 7",
  39   loopStartFrame: 3, loopEndFrame: 7, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,3,4,5,6,3,4,5,6,3] },
  40
  41 { description: "loop internally from 4 -> 6 with playbackRate of 0.5",
  42   loopStartFrame: 4, loopEndFrame: 6, renderFrames: 16, playbackRate: 0.5, expected: [0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 4, 4.5, 5, 5.5] },
  43
  44 { description: "loop internally from 4 -> 6 with playbackRate of 1.5",
  45   loopStartFrame: 4, loopEndFrame: 6, renderFrames: 16, playbackRate: 1.5, expected: [0, 1.5, 3, 4.5, 4, 5.5, 5, 4.5, 4, 5.5, 5, 4.5, 4, 5.5, 5, 4.5] },
  46
  47 { description: "illegal playbackRate of 47 greater than loop length",
  48   loopStartFrame: 4, loopEndFrame: 6, renderFrames: 16, playbackRate: 47, expected: [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] },
  49
  50 // Try illegal loop-points - they should be ignored and we'll loop the whole buffer.
  51
  52 { description: "illegal loop: loopStartFrame > loopEndFrame",
  53   loopStartFrame: 7, loopEndFrame: 3, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },
  54
  55 { description: "illegal loop: loopStartFrame == loopEndFrame",
  56   loopStartFrame: 3, loopEndFrame: 3, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },
  57
  58 { description: "illegal loop: loopStartFrame < 0",
  59   loopStartFrame: -45, loopEndFrame: 3, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },
  60
  61 { description: "illegal loop: loopEndFrame > bufferLength",
  62   loopStartFrame: 0, loopEndFrame: 30000, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },
  63
  64 ];
  65
  66 var sampleRate = 44100;
  67 var buffer;
  68 var bufferFrameLength = 8;
  69 var testSpacingFrames = 32;
  70 var testSpacingSeconds = testSpacingFrames / sampleRate;
  71 var totalRenderLengthFrames = tests.length * testSpacingFrames;
  72
  73 function runLoopTest(context, testNumber, test) {
  74     var source = context.createBufferSource();
  75
  76     source.buffer = buffer;
  77     source.playbackRate.value = test.playbackRate;
  78     source.loop = true;
  79     source.loopStart = test.loopStartFrame / context.sampleRate;
  80     source.loopEnd = test.loopEndFrame / context.sampleRate;
  81
  82     source.connect(context.destination);
  83
  84     // Render each test one after the other, spaced apart by testSpacingSeconds.
  85     var startTime = testNumber * testSpacingSeconds;
  86     var duration = test.renderFrames / context.sampleRate;
  87     source.start(startTime);
  88     source.stop(startTime + duration);
  89 }
  90
  91 function runTest() {
  92     if (window.testRunner) {
  93         testRunner.dumpAsText();
  94         testRunner.waitUntilDone();
  95     }
  96
  97     window.jsTestIsAsync = true;
  98
  99     // Create offline audio context.
 100     var context = new webkitOfflineAudioContext(1, totalRenderLengthFrames, sampleRate);
 101     buffer = createTestBuffer(context, bufferFrameLength);
 102
 103     for (var i = 0; i < tests.length; ++i)
 104         runLoopTest(context, i, tests[i]);
 105
 106     context.oncomplete = checkAllTests;
 107     context.startRendering();
 108 }
 109
 110 runTest();
 111 successfullyParsed = true;
 112
 113 </script>
 114
 115 <script src="../fast/js/resources/js-test-post.js"></script>
 116 </body>
 117 </html>