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| 1 <!DOCTYPE html> | |
| 2 <html> | |
| 3 | |
| 4 <head> | |
| 5 <script src="../resources/js-test.js"></script> | |
| 6 <script src="resources/compatibility.js"></script> | |
| 7 <script src="resources/audit-util.js"></script> | |
| 8 <script src="resources/audio-testing.js"></script> | |
| 9 <script src="resources/merger-testing.js"></script> | |
| 10 </head> | |
| 11 | |
| 12 <body> | |
| 13 <script> | |
| 14 description('Test input handling behavior of ChannelMergerNode.'); | |
| 15 window.jsTestIsAsync = true; | |
| 16 | |
| 17 var audit = Audit.createTaskRunner(); | |
| 18 | |
| 19 // Task: Check if an inactive input renders a silent mono channel in the | |
| 20 // output. | |
| 21 audit.defineTask('silent-channel', function (done) { | |
| 22 testMergerInput({ | |
| 23 numberOfChannels: 6, | |
| 24 | |
| 25 // Create a mono source buffer filled with '1'. | |
| 26 testBufferContent: [1], | |
| 27 | |
| 28 // Connect the output of source into the 4th input of merger. | |
| 29 mergerInputIndex: 3, | |
| 30 | |
| 31 // All channels should contain 0, except channel 4 which should be 1. | |
| 32 expected: [0, 0, 0, 1, 0, 0], | |
| 33 }, done); | |
| 34 }); | |
| 35 | |
| 36 | |
| 37 // Task: Check if a stereo input is being down-mixed to mono channel | |
| 38 // correctly based on the mixing rule. | |
| 39 audit.defineTask('stereo-down-mixing', function (done) { | |
| 40 testMergerInput({ | |
| 41 numberOfChannels: 6, | |
| 42 | |
| 43 // Create a stereo buffer filled with '1' and '2' for left and right | |
| 44 // channels respectively. | |
| 45 testBufferContent: [1, 2], | |
| 46 | |
| 47 // Connect the output of source into the 1st input of merger. | |
| 48 mergerInputIndex: undefined, | |
| 49 | |
| 50 // The result of summed and down-mixed stereo audio should be 1.5. | |
| 51 // (= 1 * 0.5 + 2 * 0.5) | |
| 52 expected: [1.5, 0, 0, 0, 0, 0], | |
| 53 }, done); | |
| 54 }); | |
| 55 | |
| 56 | |
| 57 // Task: Check if 3-channel input gets processed by the 'discrete' mixing | |
| 58 // rule. | |
| 59 audit.defineTask('undefined-channel-layout', function (done) { | |
| 60 testMergerInput({ | |
| 61 numberOfChannels: 6, | |
| 62 | |
| 63 // Create a 3-channel buffer filled with '1', '2', and '3' respectively. | |
| 64 testBufferContent: [1, 2, 3], | |
| 65 | |
| 66 // Connect the output of source into the 1st input of merger. | |
| 67 mergerInputIndex: undefined, | |
| 68 | |
| 69 // The result of summed stereo audio should be 1 because 3-channel is | |
| 70 // not a canonical layout, so the input channel 2 and 3 should be | |
| 71 // dropped by 'discrete' mixing rule. | |
| 72 expected: [1, 0, 0, 0, 0, 0], | |
| 73 }, done); | |
| 74 }); | |
| 75 | |
| 76 | |
| 77 // Task: Merging two inputs into a single stereo stream. | |
| 78 audit.defineTask('merging-to-stereo', function (done) { | |
| 79 | |
| 80 // For this test, the number of channel should be 2. | |
| 81 var context = new OfflineAudioContext(2, 128, 44100); | |
| 82 var merger = context.createChannelMerger(); | |
| 83 var source1 = context.createBufferSource(); | |
| 84 var source2 = context.createBufferSource(); | |
| 85 | |
| 86 // Create a DC offset buffer (mono) filled with 1 and assign it to BS | |
| 87 // nodes. | |
| 88 var positiveDCOffset = createConstantBuffer(context, 128, 1); | |
| 89 var negativeDCOffset = createConstantBuffer(context, 128, -1); | |
| 90 source1.buffer = positiveDCOffset; | |
| 91 source2.buffer = negativeDCOffset; | |
| 92 | |
| 93 // Connect: BS#1 => merger_input#0, BS#2 => Inverter => merger_input#1 | |
| 94 source1.connect(merger, 0, 0); | |
| 95 source2.connect(merger, 0, 1); | |
| 96 merger.connect(context.destination); | |
| 97 source1.start(); | |
| 98 source2.start(); | |
| 99 | |
| 100 context.startRendering().then(function (buffer) { | |
| 101 | |
| 102 // Channel#0 = 1, Channel#1 = -1 | |
| 103 Should('Channel #0', buffer.getChannelData(0)).beConstantValueOf(1); | |
| 104 Should('Channel #1', buffer.getChannelData(1)).beConstantValueOf(-1); | |
| 105 | |
| 106 done(); | |
| 107 }); | |
| 108 }); | |
| 109 | |
| 110 | |
| 111 audit.defineTask('finish', function (done) { | |
| 112 finishJSTest(); | |
| 113 done(); | |
| 114 }); | |
| 115 | |
| 116 audit.runTasks( | |
| 117 'silent-channel', | |
| 118 'stereo-down-mixing', | |
| 119 'undefined-channel-layout', | |
| 120 'merging-to-stereo', | |
| 121 'finish' | |
| 122 ); | |
| 123 | |
| 124 successfullyParsed = true; | |
| 125 </script> | |
| 126 </body> | |
| 127 | |
| 128 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
