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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.resume().'); |
| 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, 1, 1.0); |
| 26 var constantSource = context.createBufferSource(); |
| 27 constantSource.buffer = constantBuffer; |
| 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 if (context.currentTime === suspendTime1) |
| 38 testPassed('Context is suspended at ' + suspendTime1 * sampleRate + '
frame as expected.'); |
| 39 |
| 40 constantSource.connect(context.destination); |
| 41 constantSource.start(); |
| 42 testPassed('A constant buffer is connected to destination and started at
' + |
| 43 suspendTime1 * sampleRate + ' frame.'); |
| 44 |
| 45 context.resume(); |
| 46 }); |
| 47 |
| 48 // Suspend at 2 seconds and disconnect the node. The audio output should |
| 49 // be 0.0 from |suspendTime2| to the end. |
| 50 var suspendTime2 = 2; |
| 51 context.suspend(suspendTime2).then(function () { |
| 52 if (context.currentTime === suspendTime2) |
| 53 testPassed('Context is suspended at ' + suspendTime2 * sampleRate + '
frame as expected.'); |
| 54 |
| 55 constantSource.disconnect(); |
| 56 testPassed('A constant buffer is disconnected at ' + suspendTime2 * samp
leRate + ' frame.'); |
| 57 |
| 58 context.resume(); |
| 59 }); |
| 60 |
| 61 context.startRendering().then(function (buffer) { |
| 62 verifyResult(buffer); |
| 63 finishJSTest(); |
| 64 }); |
| 65 |
| 66 function verifyResult(buffer) { |
| 67 var data = buffer.getChannelData(0); |
| 68 |
| 69 var suspendIndex1 = suspendTime1 * sampleRate; |
| 70 var suspendIndex2 = suspendTime2 * sampleRate; |
| 71 var endIndex = renderDuration * sampleRate; |
| 72 |
| 73 // Split the rendered buffer into 3 segments: |
| 74 // [0, suspendIndex1), [suspendIndex1, suspendIndex2), [suspendIndex2, |
| 75 // endIndex). |
| 76 var subarray0 = data.subarray(0, suspendIndex1); |
| 77 var subarray1 = data.subarray(suspendIndex1, suspendIndex2); |
| 78 var subarray2 = data.subarray(suspendIndex2, endIndex); |
| 79 |
| 80 // Each segment should contain a constant value of 0, 1 and 0 |
| 81 // respectively. |
| 82 Should('Buffer frame [0, ' + suspendIndex1 + ')', subarray0).beConstant
ValueOf(0); |
| 83 Should('Buffer frame [' + suspendIndex1 + ', ' + suspendIndex2 + ')', su
barray1) |
| 84 .beConstantValueOf(1); |
| 85 Should('Buffer frame [' + suspendIndex2 + ', ' + endIndex + ')', subarra
y2) |
| 86 .beConstantValueOf(0); |
| 87 } |
| 88 |
| 89 successfullyParsed = true; |
| 90 </script> |
| 91 |
| 92 </body> |
| 93 </html> |
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Chromium Code Reviews
Issue 1405413004:
Implement suspend() and resume() for OfflineAudioContext (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master