LayoutTests/webaudio/audiobuffersource-start.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 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 // Enable test when AudioBufferSourceNode hack is fixed: https://bugs.webkit.org/show_bug.cgi?id=77224
  39 // { description: "start(when, 3_frames, 3_frames): play a middle section with explicit offset and duration",
  40 //   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] },
  41
  42 ];
  43
  44 var sampleRate = 44100;
  45 var buffer;
  46 var bufferFrameLength = 8;
  47 var testSpacingFrames = 32;
  48 var testSpacingSeconds = testSpacingFrames / sampleRate;
  49 var totalRenderLengthFrames = tests.length * testSpacingFrames;
  50
  51 function runLoopTest(context, testNumber, test) {
  52     var source = context.createBufferSource();
  53
  54     source.buffer = buffer;
  55     source.playbackRate.value = test.playbackRate;
  56
  57     source.connect(context.destination);
  58
  59     // Render each test one after the other, spaced apart by testSpacingSeconds.
  60     var startTime = testNumber * testSpacingSeconds;
  61
  62     if (test.offsetFrame == "none" && test.durationFrames == "none") {
  63         source.start(startTime);
  64     } else if (test.durationFrames == "none") {
  65         var offset = test.offsetFrame / context.sampleRate;
  66         source.start(startTime, offset);
  67     } else {
  68         var offset = test.offsetFrame / context.sampleRate;
  69         var duration = test.durationFrames / context.sampleRate;
  70         source.start(startTime, offset, duration);
  71     }
  72 }
  73
  74 function runTest() {
  75     if (window.testRunner) {
  76         testRunner.dumpAsText();
  77         testRunner.waitUntilDone();
  78     }
  79
  80     window.jsTestIsAsync = true;
  81
  82     // Create offline audio context.
  83     var context = new webkitOfflineAudioContext(1, totalRenderLengthFrames, sampleRate);
  84     buffer = createTestBuffer(context, bufferFrameLength);
  85
  86     for (var i = 0; i < tests.length; ++i)
  87         runLoopTest(context, i, tests[i]);
  88
  89     context.oncomplete = checkAllTests;
  90     context.startRendering();
  91 }
  92
  93 runTest();
  94 successfullyParsed = true;
  95
  96 </script>
  97
  98 <script src="../fast/js/resources/js-test-post.js"></script>
  99 </body>
 100 </html>