Chromium Code Reviews Chromium Code Reviews
Issue 1140723003:
Implement suspend() and resume() for OfflineAudioContext (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@master| OLD | NEW |
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| (Empty) | |
| 1 <!doctype html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <script src="../resources/js-test.js"></script> | |
| 5 <script src="resources/compatibility.js"></script> | |
| 6 <script src="resources/audio-testing.js"></script> | |
| 7 </head> | |
| 8 | |
| 9 <body> | |
| 10 <script> | |
| 11 description('Test synchronous graph manipulation with OfflineAudioContext. suspend() and OfflineAudioContext.suspend().'); | |
| 12 window.jsTestIsAsync = true; | |
| 13 | |
| 14 var context; | |
| 15 var renderQuantum = 128; | |
| 16 var renderDuration = 3; | |
| 17 | |
| 18 // The sample rate is multiple of the rendering quantum, so suspension | |
| 19 // times fall in to the render quantum boundary. | |
| 20 var sampleRate = renderQuantum * 100; | |
| 21 | |
| 22 context = new OfflineAudioContext(1, sampleRate * renderDuration, sampleRa te); | |
| 23 | |
| 24 // Create a constant buffer of 1.0. | |
| 25 var constantBuffer = createConstantBuffer(context, 128, 1.0); | |
| 26 var constantSource = context.createBufferSource(); | |
| 27 constantSource.buffer = dcOffsetBuffer; | |
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Raymond Toy
2015/06/16 17:12:23
dcOffsetBuffer? How did this work?
hongchan
2015/06/16 17:34:36
I missed the variable name change. Fixing it.
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| 28 constantSource.loop = true; | |
| 29 | |
| 30 // The audio output from the beginning (0.0 second) to the first suspend | |
| 31 // time should be 0.0 because there is no connection to the destination. | |
| 32 | |
| 33 // Suspend at 1 second and activate the source node. The audio output | |
| 34 // should be 1.0 from |suspendTime1| to the next suspension. | |
| 35 var suspendTime1 = 1; | |
| 36 context.suspend(suspendTime1).then(function () { | |
| 37 Should('The first suspend time', context.currentTime).beEqualTo(suspendT ime1); | |
| 38 constantSource.connect(context.destination); | |
| 39 constantSource.start(); | |
| 40 context.resume(); | |
| 41 }); | |
| 42 | |
| 43 // Suspend at 2 seconds and disconnect the node. The audio output should | |
| 44 // be 0.0 from |suspendTime2| to the end. | |
| 45 var suspendTime2 = 2; | |
| 46 context.suspend(suspendTime2).then(function () { | |
| 47 Should('The second suspend time', context.currentTime).beEqualTo(suspend Time2); | |
| 48 constantSource.disconnect(); | |
| 49 context.resume(); | |
| 50 }); | |
| 51 | |
| 52 context.startRendering().then(function (buffer) { | |
| 53 verifyResult(buffer); | |
| 54 finishJSTest(); | |
| 55 }); | |
| 56 | |
| 57 function verifyResult(buffer) { | |
| 58 var data = buffer.getChannelData(0); | |
| 59 | |
| 60 // Split the rendered buffer into 3 segments: [0.0 ~ 1.0], [1.0 ~ 2.0] | |
|
Raymond Toy
2015/06/16 17:12:23
What does the ~ mean? Did you mean -?
hongchan
2015/06/16 17:34:36
I replace this with the mathematical expression fo
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| 61 // [2.0 ~ 3.0]. | |
| 62 var subarray0 = data.subarray(0, suspendTime1 * sampleRate); | |
| 63 var subarray1 = data.subarray(suspendTime1 * sampleRate, suspendTime2 * sampleRate); | |
| 64 var subarray2 = data.subarray(suspendTime2 * sampleRate, renderDuration * sampleRate); | |
| 65 | |
| 66 // Each segment should contain a constant value of 0, 1 and 0 | |
| 67 // respectively. | |
| 68 Should('Buffer [0~12800]', subarray0).beConstantValueOf(0); | |
| 69 Should('Buffer [12800~25600]', subarray1).beConstantValueOf(1); | |
| 70 Should('Buffer [25600~38400]', subarray2).beConstantValueOf(0); | |
| 71 } | |
| 72 | |
| 73 successfullyParsed = true; | |
| 74 </script> | |
| 75 | |
| 76 </body> | |
| 77 </html> | |
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