src/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 // Enable test when AudioBufferSourceNode hack is fixed: https://bugs.webkit.org/show_bug.cgi?id=77224
  48 // { description: "start(when, 3_frames, 3_frames): play a middle section with explicit offset and duration",
  49 //   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] },
  50
  51 ];
  52
  53 var sampleRate = 44100;
  54 var buffer;
  55 var bufferFrameLength = 8;
  56 var testSpacingFrames = 32;
  57 var testSpacingSeconds = testSpacingFrames / sampleRate;
  58 var totalRenderLengthFrames = tests.length * testSpacingFrames;
  59
  60 function runLoopTest(context, testNumber, test) {
  61     var source = context.createBufferSource();
  62
  63     source.buffer = buffer;
  64     source.playbackRate.value = test.playbackRate;
  65
  66     source.connect(context.destination);
  67
  68     // Render each test one after the other, spaced apart by testSpacingSeconds.
  69     var startTime = testNumber * testSpacingSeconds;
  70
  71     if (test.offsetFrame == "none" && test.durationFrames == "none") {
  72         source.start(startTime);
  73     } else if (test.durationFrames == "none") {
  74         var offset = test.offsetFrame / context.sampleRate;
  75         source.start(startTime, offset);
  76     } else {
  77         var offset = test.offsetFrame / context.sampleRate;
  78         var duration = test.durationFrames / context.sampleRate;
  79         source.start(startTime, offset, duration);
  80     }
  81 }
  82
  83 function runTest() {
  84     if (window.testRunner) {
  85         testRunner.dumpAsText();
  86         testRunner.waitUntilDone();
  87     }
  88
  89     window.jsTestIsAsync = true;
  90
  91     // Create offline audio context.
  92     var context = new OfflineAudioContext(1, totalRenderLengthFrames, sampleRate);
  93     buffer = createTestBuffer(context, bufferFrameLength);
  94
  95     for (var i = 0; i < tests.length; ++i)
  96         runLoopTest(context, i, tests[i]);
  97
  98     context.oncomplete = checkAllTests;
  99     context.startRendering();
 100 }
 101
 102 runTest();
 103 successfullyParsed = true;
 104
 105 </script>
 106
 107 </body>
 108 </html>