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| 1 <!DOCTYPE html> | 1 <!DOCTYPE html> |
| 2 <html> | 2 <html> |
| 3 <head> |
| 4 <title> |
| 5 audiochannelmerger-cycle.html |
| 6 </title> |
| 7 <script src="../../resources/testharness.js"></script> |
| 8 <script src="../../resources/testharnessreport.js"></script> |
| 9 <script src="../resources/audit-util.js"></script> |
| 10 <script src="../resources/audit.js"></script> |
| 11 </head> |
| 12 <body> |
| 13 <script id="layout-test-code"> |
| 14 // This specific sample rate is chosen to avoid the round/truncation error |
| 15 // in delay time. See: crbug.com/448801 |
| 16 let sampleRate = 32768; |
| 3 | 17 |
| 4 <head> | 18 // Web Audio API's rendering quantum. |
| 5 <script src="../../resources/testharness.js"></script> | 19 let renderingQuantum = 128; |
| 6 <script src="../../resources/testharnessreport.js"></script> | |
| 7 <script src="../resources/audit-util.js"></script> | |
| 8 <script src="../resources/audit.js"></script> | |
| 9 </head> | |
| 10 | 20 |
| 11 <body> | 21 // 4x of rendering quantum. This is to make the rendered result long |
| 12 <script> | 22 // enough so that we can observe the delayed output. |
| 23 let renderLength = renderingQuantum * 4; |
| 13 | 24 |
| 14 // This specific sample rate is chosen to avoid the round/truncation error | 25 // 1x rendering quantum of delay. |
| 15 // in delay time. See: crbug.com/448801 | 26 let delayTime = renderingQuantum / sampleRate; |
| 16 var sampleRate = 32768; | |
| 17 | 27 |
| 18 // Web Audio API's rendering quantum. | 28 // Use 2 channels as a test case. |
| 19 var renderingQuantum = 128; | 29 let numberOfChannels = 2; |
| 20 | 30 |
| 21 // 4x of rendering quantum. This is to make the rendered result long enough | 31 let audit = Audit.createTaskRunner(); |
| 22 // so that we can observe the delayed output. | |
| 23 var renderLength = renderingQuantum * 4; | |
| 24 | 32 |
| 25 // 1x rendering quantum of delay. | 33 audit.define('merger-cyclic-graph', (task, should) => { |
| 26 var delayTime = renderingQuantum / sampleRate; | |
| 27 | 34 |
| 28 // Use 2 channels as a test case. | 35 let context = |
| 29 var numberOfChannels = 2; | 36 new OfflineAudioContext(numberOfChannels, renderLength, sampleRate); |
| 37 let merger = context.createChannelMerger(2); |
| 38 let delay = context.createDelay(); |
| 39 let source = context.createBufferSource(); |
| 30 | 40 |
| 31 var audit = Audit.createTaskRunner(); | 41 // Create a mono source buffer filled with '1'. |
| 42 source.buffer = createConstantBuffer(context, renderLength, [1]); |
| 32 | 43 |
| 33 audit.define('merger-cyclic-graph', (task, should) => { | 44 delay.delayTime.value = delayTime; |
| 34 | 45 |
| 35 var context = new OfflineAudioContext( | 46 // Connect the source to input 0 of the merger. Connect the output of |
| 36 numberOfChannels, renderLength, sampleRate | 47 // the merger to a delay node whose output is then connected to input 1 |
| 37 ); | 48 // of the merger. See: crbug.com/442925 |
| 38 var merger = context.createChannelMerger(2); | 49 source.connect(merger, 0, 0); |
| 39 var delay = context.createDelay(); | 50 delay.connect(merger, 0, 1); |
| 40 var source = context.createBufferSource(); | 51 merger.connect(delay); |
| 52 merger.connect(context.destination); |
| 53 source.start(); |
| 41 | 54 |
| 42 // Create a mono source buffer filled with '1'. | 55 context.startRendering().then(function(buffer) { |
| 43 source.buffer = createConstantBuffer(context, renderLength, [1]); | 56 // Expected output values: the output of delay node will be a stereo |
| 57 // signal of [1, 0]. When it feeds back to the 2nd input of merger |
| 58 // node, the stereo channel will be summed to mono resulting in 0.5. |
| 59 let expected_left = []; |
| 60 let expected_right = []; |
| 44 | 61 |
| 45 delay.delayTime.value = delayTime; | 62 for (let i = 0; i < renderLength; i++) { |
| 63 // Note that the delayed channel will be zero for the first 128 |
| 64 // samples due to the cyclic audio graph, the second 128 sample will |
| 65 // be also zero because of 128 samples delay. |
| 66 expected_left[i] = 1.0; |
| 67 expected_right[i] = (i < renderingQuantum * 2) ? 0.0 : 0.5; |
| 68 } |
| 46 | 69 |
| 47 // Connect the source to input 0 of the merger. Connect the output of | 70 let actual_left = buffer.getChannelData(0); |
| 48 // the merger to a delay node whose output is then connected to input 1 | 71 let actual_right = buffer.getChannelData(1); |
| 49 // of the merger. See: crbug.com/442925 | 72 should(actual_left, 'Left channel').beEqualToArray(expected_left); |
| 50 source.connect(merger, 0, 0); | 73 should(actual_right, 'Right channel').beEqualToArray(expected_right); |
| 51 delay.connect(merger, 0, 1); | |
| 52 merger.connect(delay); | |
| 53 merger.connect(context.destination); | |
| 54 source.start(); | |
| 55 | 74 |
| 56 context.startRendering().then(function (buffer) { | 75 task.done(); |
| 57 // Expected output values: the output of delay node will be a stereo | 76 }); |
| 58 // signal of [1, 0]. When it feeds back to the 2nd input of merger node, | |
| 59 // the stereo channel will be summed to mono resulting in 0.5. | |
| 60 var expected_left = []; | |
| 61 var expected_right = []; | |
| 62 | 77 |
| 63 for (var i = 0; i < renderLength; i++) { | |
| 64 // Note that the delayed channel will be zero for the first 128 sample
s | |
| 65 // due to the cyclic audio graph, the second 128 sample will be also | |
| 66 // zero because of 128 samples delay. | |
| 67 expected_left[i] = 1.0; | |
| 68 expected_right[i] = (i < renderingQuantum * 2) ? 0.0 : 0.5; | |
| 69 } | |
| 70 | |
| 71 var actual_left = buffer.getChannelData(0); | |
| 72 var actual_right = buffer.getChannelData(1); | |
| 73 should(actual_left, "Left channel") | |
| 74 .beEqualToArray(expected_left); | |
| 75 should(actual_right, "Right channel") | |
| 76 .beEqualToArray(expected_right); | |
| 77 | |
| 78 task.done(); | |
| 79 }); | 78 }); |
| 80 | 79 |
| 81 }); | 80 audit.run(); |
| 82 | 81 </script> |
| 83 audit.run(); | 82 </body> |
| 84 </script> | |
| 85 </body> | |
| 86 | |
| 87 </html> | 83 </html> |
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Chromium Code Reviews
Issue 2895963003:
Apply layout-test-tidy to LayoutTests/webaudio (Closed)
