third_party/WebKit/LayoutTests/webaudio/audiobuffersource-start.html

   1 <!DOCTYPE html>
   2
   3 <html>
   4 <head>
   5 <script src="resources/compatibility.js"></script>
   6 <script src="resources/audio-testing.js"></script>
   7 <script src="resources/audiobuffersource-testing.js"></script>
   8 <script src="../resources/js-test.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 start() with a variety of offsets and durations.");
  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: "start(when): implicitly play whole buffer from beginning to end",
  24   offsetFrame: "none", durationFrames: "none", renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },
  25
  26 { description: "start(when, 0): play whole buffer from beginning to end explicitly giving offset of 0",
  27   offsetFrame: 0, durationFrames: "none", renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },
  28
  29 { description: "start(when, 0, 8_frames): play whole buffer from beginning to end explicitly giving offset of 0 and duration of 8 frames",
  30   offsetFrame: 0, durationFrames: 8, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },
  31
  32 { description: "start(when, 4_frames): play with explicit non-zero offset",
  33   offsetFrame: 4, durationFrames: "none", renderFrames: 16, playbackRate: 1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },
  34
  35 { description: "start(when, 4_frames, 4_frames): play with explicit non-zero offset and duration",
  36   offsetFrame: 4, durationFrames: 4, renderFrames: 16, playbackRate: 1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },
  37
  38 { description: "start(when, 7_frames): play with explicit non-zero offset near end of buffer",
  39   offsetFrame: 7, durationFrames: 1, renderFrames: 16, playbackRate: 1, expected: [7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] },
  40
  41 { description: "start(when, 8_frames): play with explicit offset at end of buffer",
  42   offsetFrame: 8, durationFrames: 0, renderFrames: 16, playbackRate: 1, expected: [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] },
  43
  44 { description: "start(when, 9_frames): play with explicit offset past end of buffer",
  45   offsetFrame: 8, durationFrames: 0, renderFrames: 16, playbackRate: 1, expected: [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] },
  46
  47 // When the duration exceeds the buffer, just play to the end of the buffer.
  48 // (This is different from the case when we're looping, which is tested in loop-comprehensive.)
  49 { description: "start(when, 0, 15_frames): play with whole buffer, with long duration (clipped)",
  50   offsetFrame: 0, durationFrames: 15, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },
  51
  52 // Enable test when AudioBufferSourceNode hack is fixed: https://bugs.webkit.org/show_bug.cgi?id=77224
  53 // { description: "start(when, 3_frames, 3_frames): play a middle section with explicit offset and duration",
  54 //   offsetFrame: 3, durationFrames: 3, renderFrames: 16, playbackRate: 1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },
  55
  56 ];
  57
  58 var sampleRate = 44100;
  59 var buffer;
  60 var bufferFrameLength = 8;
  61 var testSpacingFrames = 32;
  62 var testSpacingSeconds = testSpacingFrames / sampleRate;
  63 var totalRenderLengthFrames = tests.length * testSpacingFrames;
  64
  65 function runLoopTest(context, testNumber, test) {
  66     var source = context.createBufferSource();
  67
  68     source.buffer = buffer;
  69     source.playbackRate.value = test.playbackRate;
  70
  71     source.connect(context.destination);
  72
  73     // Render each test one after the other, spaced apart by testSpacingSeconds.
  74     var startTime = testNumber * testSpacingSeconds;
  75
  76     if (test.offsetFrame == "none" && test.durationFrames == "none") {
  77         source.start(startTime);
  78     } else if (test.durationFrames == "none") {
  79         var offset = test.offsetFrame / context.sampleRate;
  80         source.start(startTime, offset);
  81     } else {
  82         var offset = test.offsetFrame / context.sampleRate;
  83         var duration = test.durationFrames / context.sampleRate;
  84         source.start(startTime, offset, duration);
  85     }
  86 }
  87
  88 function runTest() {
  89     if (window.testRunner) {
  90         testRunner.dumpAsText();
  91         testRunner.waitUntilDone();
  92     }
  93
  94     window.jsTestIsAsync = true;
  95
  96     // Create offline audio context.
  97     var context = new OfflineAudioContext(1, totalRenderLengthFrames, sampleRate);
  98     buffer = createTestBuffer(context, bufferFrameLength);
  99
 100     for (var i = 0; i < tests.length; ++i)
 101         runLoopTest(context, i, tests[i]);
 102
 103     context.oncomplete = checkAllTests;
 104     context.startRendering();
 105 }
 106
 107 runTest();
 108 successfullyParsed = true;
 109
 110 </script>
 111
 112 </body>
 113 </html>