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| 1 <!DOCTYPE html> | |
| 2 <html> | |
| 3 | |
| 4 <head> | |
| 5 <title>Test AudioBufferSourceNode premature loop stop</title> | |
| 6 <script src="../resources/js-test.js"></script> | |
| 7 <script src="resources/compatibility.js"></script> | |
| 8 <script src="resources/audit-util.js"></script> | |
| 9 <script src="resources/audio-testing.js"></script> | |
| 10 </head> | |
| 11 | |
| 12 <body> | |
| 13 <script> | |
| 14 description("Test if AudioBufferSourceNode stops prematurely after the loop
attribute change."); | |
| 15 window.jsTestIsAsync = true; | |
| 16 | |
| 17 // Reasonably low sample rate for the optimum test speed. | |
| 18 var sampleRate = 4096; | |
| 19 | |
| 20 var audit = Audit.createTaskRunner(); | |
| 21 | |
| 22 // Task: Create a buffer with 3 regions filled with constant value of [1, 2, | |
| 23 // 3]. Then set a loop range over the second region. Start the loop and | |
| 24 // disable it in the middle of looping. Verify the rendered buffer has the | |
| 25 // entire content including the looped region. | |
| 26 audit.defineTask('premature-loop-stop', function (done) { | |
| 27 var regionValues = [1, 2, 3]; | |
| 28 | |
| 29 // The region length is 2 * render quantum size to be able to suspend the | |
| 30 // rendering at the half of the region. | |
| 31 var regionLength = 256; | |
| 32 | |
| 33 // The test will repeat the second region 3 times, thus the rendered audio | |
| 34 // have the length of 5 * regionLength. | |
| 35 var context = new OfflineAudioContext(1, 5 * regionLength, sampleRate); | |
| 36 | |
| 37 // Create 3 constant buffers of [1, 2, 3] and concatenate them together: | |
| 38 // | 1 | 2 | 3 | | |
| 39 var testBuffer = context.createBuffer(1, 3 * regionLength, sampleRate); | |
| 40 var testChannel = testBuffer.getChannelData(0); | |
| 41 for (var i = 0; i < regionValues.length; i++) { | |
| 42 var region = createConstantBuffer(context, regionLength, regionValues[i]
); | |
| 43 testChannel.set(region.getChannelData(0), regionLength * i);; | |
| 44 } | |
| 45 | |
| 46 var source = context.createBufferSource(); | |
| 47 source.connect(context.destination); | |
| 48 | |
| 49 source.buffer = testBuffer; | |
| 50 source.loop = true; | |
| 51 | |
| 52 // Set loop points over the region 2. | |
| 53 source.loopStart = regionLength/sampleRate; | |
| 54 source.loopEnd = 2 * regionLength/sampleRate; | |
| 55 | |
| 56 source.start(); | |
| 57 | |
| 58 // Disengage the loop at |3.5 * regionLength / sampleRate| which is the | |
| 59 // end of 7th rendering quantum and also the half of the third iteration | |
| 60 // of region #2. | |
| 61 context.suspend(3.5 * regionLength/sampleRate).then(function () { | |
| 62 source.loop = false; | |
| 63 context.resume(); | |
| 64 }); | |
| 65 | |
| 66 context.startRendering().then(function (renderedBuffer) { | |
| 67 var channel = renderedBuffer.getChannelData(0); | |
| 68 | |
| 69 // Verify if the rendered buffer has the following structure: | |
| 70 // | 1 | 2 | 2 | 2 | 3 | | |
| 71 var region1 = channel.subarray(0, regionLength - 1); | |
| 72 var region2 = channel.subarray(regionLength, 4 * regionLength - 1); | |
| 73 var region3 = channel.subarray(4 * regionLength, 5 * regionLength - 1); | |
| 74 | |
| 75 Should('Region #1', region1).beConstantValueOf(1); | |
| 76 Should('Region #2 (looped)', region2).beConstantValueOf(2); | |
| 77 Should('Region #3', region3).beConstantValueOf(3); | |
| 78 }).then(done); | |
| 79 }); | |
| 80 | |
| 81 audit.defineTask('finish', function (done) { | |
| 82 finishJSTest(); | |
| 83 done(); | |
| 84 }); | |
| 85 | |
| 86 audit.runTasks(); | |
| 87 | |
| 88 successfullyParsed = true; | |
| 89 </script> | |
| 90 </body> | |
| 91 | |
| 92 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
