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| 1 <!DOCTYPE html> | |
| 2 | |
| 3 <!-- | |
| 4 Tests that we are able to schedule a series of notes to playback with sample-acc
uracy. | |
| 5 We use an impulse so we can tell exactly where the rendering is happening. | |
| 6 --> | |
| 7 | |
| 8 <html> | |
| 9 <head> | |
| 10 <script src="../resources/js-test.js"></script> | |
| 11 <script src="resources/compatibility.js"></script> | |
| 12 <script src="resources/audit-util.js"></script> | |
| 13 <script src="resources/audio-testing.js"></script> | |
| 14 <script type="text/javascript" src="resources/buffer-loader.js"></script> | |
| 15 </head> | |
| 16 | |
| 17 <body> | |
| 18 | |
| 19 <div id="description"></div> | |
| 20 <div id="console"></div> | |
| 21 | |
| 22 <script> | |
| 23 description("Tests sample-accurate scheduling."); | |
| 24 | |
| 25 var sampleRate = 44100.0; | |
| 26 var lengthInSeconds = 4; | |
| 27 | |
| 28 var context = 0; | |
| 29 var bufferLoader = 0; | |
| 30 var impulse; | |
| 31 | |
| 32 // See if we can render at exactly these sample offsets. | |
| 33 var sampleOffsets = [0, 3, 512, 517, 1000, 1005, 20000, 21234, 37590]; | |
| 34 | |
| 35 function createImpulse() { | |
| 36 // An impulse has a value of 1 at time 0, and is otherwise 0. | |
| 37 impulse = context.createBuffer(2, 512, sampleRate); | |
| 38 var sampleDataL = impulse.getChannelData(0); | |
| 39 var sampleDataR = impulse.getChannelData(1); | |
| 40 sampleDataL[0] = 1.0; | |
| 41 sampleDataR[0] = 1.0; | |
| 42 } | |
| 43 | |
| 44 function playNote(time) { | |
| 45 var bufferSource = context.createBufferSource(); | |
| 46 bufferSource.buffer = impulse; | |
| 47 bufferSource.connect(context.destination); | |
| 48 bufferSource.start(time); | |
| 49 } | |
| 50 | |
| 51 function checkSampleAccuracy(event) { | |
| 52 var buffer = event.renderedBuffer; | |
| 53 | |
| 54 var bufferDataL = buffer.getChannelData(0); | |
| 55 var bufferDataR = buffer.getChannelData(1); | |
| 56 | |
| 57 var success = true; | |
| 58 var impulseCount = 0; | |
| 59 var badOffsetCount = false; | |
| 60 | |
| 61 // Go through every sample and make sure it's 0, except at positions in samp
leOffsets. | |
| 62 for (var i = 0; i < buffer.length; ++i) { | |
| 63 // Make sure left == right | |
| 64 if (bufferDataL[i] != bufferDataR[i]) { | |
| 65 testFailed("Rendered buffer left and right channels are not identica
l."); | |
| 66 success = false; | |
| 67 break; | |
| 68 } | |
| 69 | |
| 70 if (bufferDataL[i] != 0) { | |
| 71 // Make sure this index is in sampleOffsets | |
| 72 var found = false; | |
| 73 for (var j = 0; j < sampleOffsets.length; ++j) { | |
| 74 if (sampleOffsets[j] == i) { | |
| 75 found = true; | |
| 76 break; | |
| 77 } | |
| 78 } | |
| 79 ++impulseCount; | |
| 80 if (!found) { | |
| 81 testFailed("Non-zero sample found at sample offset " + i); | |
| 82 success = false; | |
| 83 ++badOffsetCount; | |
| 84 } | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 if (impulseCount == sampleOffsets.length) { | |
| 89 if (badOffsetCount == 0) { | |
| 90 testPassed("Expected number of events found."); | |
| 91 } else { | |
| 92 testFailed("Expected number of events found, but " + badOffsetCount
+ " are at incorrect offsets."); | |
| 93 success = false; | |
| 94 } | |
| 95 } else { | |
| 96 testFailed("Expected " + sampleOffsets.length + " impulses but only foun
d " + impulseCount); | |
| 97 success = false; | |
| 98 } | |
| 99 | |
| 100 if (success) { | |
| 101 testPassed("All events rendered with sample-accuracy."); | |
| 102 } else { | |
| 103 testFailed("Events NOT rendered with sample-accuracy."); | |
| 104 } | |
| 105 | |
| 106 finishJSTest(); | |
| 107 } | |
| 108 | |
| 109 function runTest() { | |
| 110 if (window.testRunner) { | |
| 111 testRunner.dumpAsText(); | |
| 112 testRunner.waitUntilDone(); | |
| 113 } | |
| 114 | |
| 115 window.jsTestIsAsync = true; | |
| 116 | |
| 117 // Create offline audio context. | |
| 118 context = new OfflineAudioContext(2, sampleRate * lengthInSeconds, sampleRat
e); | |
| 119 createImpulse(); | |
| 120 | |
| 121 for (var i = 0; i < sampleOffsets.length; ++i) { | |
| 122 var timeInSeconds = sampleOffsets[i] / sampleRate; | |
| 123 playNote(timeInSeconds); | |
| 124 } | |
| 125 | |
| 126 context.oncomplete = checkSampleAccuracy; | |
| 127 context.startRendering(); | |
| 128 } | |
| 129 | |
| 130 runTest(); | |
| 131 | |
| 132 </script> | |
| 133 | |
| 134 </body> | |
| 135 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
