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| 1 <!DOCTYPE html> | |
| 2 <html> | |
| 3 | |
| 4 <head> | |
| 5 <title>Test AudioBufferSourceNode looping without explicit duration</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 AudioBufferSourceNode looping without explicit duration"); | |
| 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 short linear ramp and enable looping. The test will | |
| 23 // verify that the ramp was looped the appropriate number of times. | |
| 24 audit.defineTask('loop-count', function (done) { | |
| 25 // How many loops of the source we want to render. Any whole number | |
| 26 // greater than 1 will work. | |
| 27 var loopCount = 4; | |
| 28 var sourceFrames = 8; | |
| 29 var renderFrames = sourceFrames * loopCount; | |
| 30 | |
| 31 var context = new OfflineAudioContext(1, renderFrames, sampleRate); | |
| 32 var source = context.createBufferSource(); | |
| 33 var linearRampBuffer = createLinearRampBuffer(context, sourceFrames); | |
| 34 | |
| 35 source.buffer = linearRampBuffer; | |
| 36 source.connect(context.destination); | |
| 37 | |
| 38 // Enable looping and start the source with an offset, but without a | |
| 39 // duration. In this case, the source should loop "forever". | |
| 40 // See crbug.com/457009. | |
| 41 source.loop = true; | |
| 42 source.start(0, 0); | |
| 43 | |
| 44 context.startRendering().then(function (renderedBuffer) { | |
| 45 var badIndex = -1; | |
| 46 var success = true; | |
| 47 | |
| 48 var actual = renderedBuffer.getChannelData(0); | |
| 49 var linearRamp = linearRampBuffer.getChannelData(0); | |
| 50 | |
| 51 // Manually create a |loopCount| copies of linear ramps. | |
| 52 var expected = new Float32Array(linearRamp.length * loopCount); | |
| 53 for (var i = 0; i < loopCount; i++) | |
| 54 expected.set(linearRamp, linearRamp.length * i); | |
| 55 | |
| 56 // The actual output should match the created loop. | |
| 57 Should('The output of actual and expected loops', actual) | |
| 58 .beEqualToArray(expected); | |
| 59 }).then(done); | |
| 60 }); | |
| 61 | |
| 62 // Task: Test that looping an AudioBufferSource works correctly if the | |
| 63 // source is started and the buffer is assigned later, but before the source | |
| 64 // would start. | |
| 65 audit.defineTask('delayed-start', function (done) { | |
| 66 var renderDuration = 2; | |
| 67 var context = new OfflineAudioContext(2, sampleRate * renderDuration, samp
leRate); | |
| 68 var linearRampBuffer = createLinearRampBuffer(context, 128); | |
| 69 | |
| 70 var normal = context.createBufferSource(); | |
| 71 var delayed = context.createBufferSource(); | |
| 72 var merger = context.createChannelMerger(2); | |
| 73 | |
| 74 // Connect the normally started source to the left channel, and the | |
| 75 // delayed to the right channel. | |
| 76 normal.connect(merger, 0, 0); | |
| 77 delayed.connect(merger, 0, 1); | |
| 78 merger.connect(context.destination); | |
| 79 | |
| 80 normal.buffer = linearRampBuffer; | |
| 81 normal.loop = true; | |
| 82 delayed.loop = true; | |
| 83 | |
| 84 normal.start(1, 0); | |
| 85 delayed.start(1, 0); | |
| 86 | |
| 87 // Assign the buffer to the delayed source node at 0.5 second. | |
| 88 context.suspend(0.5).then(function () { | |
| 89 delayed.buffer = linearRampBuffer; | |
| 90 context.resume(); | |
| 91 }); | |
| 92 | |
| 93 context.startRendering().then(function (buffer) { | |
| 94 // The left and right channel must match regardless of the timing | |
| 95 // of buffer assignment. | |
| 96 Should('The content of the left and right channel', | |
| 97 buffer.getChannelData(0)).beEqualToArray(buffer.getChannelData(1)); | |
| 98 }).then(done); | |
| 99 }); | |
| 100 | |
| 101 audit.defineTask('finish', function (done) { | |
| 102 finishJSTest(); | |
| 103 done(); | |
| 104 }); | |
| 105 | |
| 106 audit.runTasks( | |
| 107 'loop-count', | |
| 108 'delayed-start', | |
| 109 'finish' | |
| 110 ); | |
| 111 | |
| 112 successfullyParsed = true; | |
| 113 </script> | |
| 114 </body> | |
| 115 | |
| 116 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
