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| 1 <!DOCTYPE html> | |
| 2 <html> | |
| 3 | |
| 4 <head> | |
| 5 <script src="../resources/js-test.js"></script> | |
| 6 <script src="resources/compatibility.js"></script> | |
| 7 <script src="resources/audit-util.js"></script> | |
| 8 <script src="resources/audio-testing.js"></script> | |
| 9 </head> | |
| 10 | |
| 11 <body> | |
| 12 <script> | |
| 13 description('AudioBufferSourceNode: test the "zero" playbackRate.'); | |
| 14 window.jsTestIsAsync = true; | |
| 15 | |
| 16 // Sample rate should be power of 128 to observe the change of AudioParam at | |
| 17 // the beginning of rendering quantum. (playbackRate is k-rate) This is the | |
| 18 // minimum sample rate in the valid sample rate range. | |
| 19 var sampleRate = 4096; | |
| 20 | |
| 21 // The render duration in seconds, and the length in samples. | |
| 22 var renderDuration = 1.0; | |
| 23 var renderLength = renderDuration * sampleRate; | |
| 24 | |
| 25 var context = new OfflineAudioContext(1, renderLength, sampleRate); | |
| 26 var audit = Audit.createTaskRunner(); | |
| 27 | |
| 28 | |
| 29 // Task: Render the actual buffer and compare with the reference. | |
| 30 audit.defineTask('synthesize-verify', function (done) { | |
| 31 var ramp = context.createBufferSource(); | |
| 32 var rampBuffer = createLinearRampBuffer(context, renderLength); | |
| 33 ramp.buffer = rampBuffer; | |
| 34 | |
| 35 ramp.connect(context.destination); | |
| 36 ramp.start(); | |
| 37 | |
| 38 // Leave the playbackRate as 1 for the first half, then change it | |
| 39 // to zero at the exact half. The zero playback rate should hold the | |
| 40 // sample value of the buffer index at the moment. (sample-and-hold) | |
| 41 ramp.playbackRate.setValueAtTime(1.0, 0.0); | |
| 42 ramp.playbackRate.setValueAtTime(0.0, renderDuration / 2); | |
| 43 | |
| 44 context.startRendering().then(function (renderedBuffer) { | |
| 45 var data = renderedBuffer.getChannelData(0); | |
| 46 var rampData = rampBuffer.getChannelData(0); | |
| 47 var half = rampData.length / 2; | |
| 48 var passed = true; | |
| 49 | |
| 50 for (var i = 1; i < rampData.length; i++) { | |
| 51 if (i < half) { | |
| 52 // Before the half position, the actual should match with the | |
| 53 // original ramp data. | |
| 54 if (data[i] !== rampData[i]) { | |
| 55 passed = false; | |
| 56 break; | |
| 57 } | |
| 58 } else { | |
| 59 // From the half position, the actual value should not change. | |
| 60 if (data[i] !== rampData[half]) { | |
| 61 passed = false; | |
| 62 break; | |
| 63 } | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 if (passed) { | |
| 68 testPassed('The zero playbackRate held the sample value correctly.'); | |
| 69 } else { | |
| 70 testFailed('The zero playbackRate should hold the sample value. ' + | |
| 71 'Expected ' + rampData[half] + ' but got ' + data[i] + ' at the inde
x ' + | |
| 72 i + '.'); | |
| 73 } | |
| 74 }).then(done); | |
| 75 }); | |
| 76 | |
| 77 audit.defineTask('finish', function (done) { | |
| 78 finishJSTest(); | |
| 79 done(); | |
| 80 }); | |
| 81 | |
| 82 audit.runTasks( | |
| 83 'synthesize-verify', | |
| 84 'finish' | |
| 85 ); | |
| 86 | |
| 87 successfullyParsed = true; | |
| 88 </script> | |
| 89 </body> | |
| 90 | |
| 91 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
