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comparison: content/media/webaudio/test/test_delayNodeChannelChanges.html
content/media/webaudio/test/test_delayNodeChannelChanges.html
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- TOR_BUG_9701
- changeset 15
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| -1:000000000000 | 0:5326953c761a |
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| 1 <!DOCTYPE HTML> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>test DelayNode channel count changes</title> | |
| 5 <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> | |
| 6 <script type="text/javascript" src="webaudio.js"></script> | |
| 7 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> | |
| 8 </head> | |
| 9 <body> | |
| 10 <pre id="test"> | |
| 11 <script class="testbody" type="text/javascript"> | |
| 12 | |
| 13 SimpleTest.waitForExplicitFinish(); | |
| 14 | |
| 15 const bufferSize = 4096; | |
| 16 | |
| 17 var ctx; | |
| 18 var testDelay; | |
| 19 var stereoDelay; | |
| 20 var invertor; | |
| 21 | |
| 22 function compareOutputs(callback) { | |
| 23 var processor = ctx.createScriptProcessor(bufferSize, 2, 0); | |
| 24 testDelay.connect(processor); | |
| 25 invertor.connect(processor); | |
| 26 processor.onaudioprocess = | |
| 27 function(e) { | |
| 28 compareBuffers(e.inputBuffer, | |
| 29 ctx.createBuffer(2, bufferSize, ctx.sampleRate)); | |
| 30 e.target.onaudioprocess = null; | |
| 31 callback(); | |
| 32 } | |
| 33 } | |
| 34 | |
| 35 function startTest() { | |
| 36 // And a two-channel signal | |
| 37 var merger = ctx.createChannelMerger(); | |
| 38 merger.connect(testDelay); | |
| 39 merger.connect(stereoDelay); | |
| 40 var oscL = ctx.createOscillator(); | |
| 41 oscL.connect(merger, 0, 0); | |
| 42 oscL.start(0); | |
| 43 var oscR = ctx.createOscillator(); | |
| 44 oscR.type = "sawtooth"; | |
| 45 oscR.connect(merger, 0, 1); | |
| 46 oscR.start(0); | |
| 47 | |
| 48 compareOutputs( | |
| 49 function () { | |
| 50 // Disconnect the two-channel signal and test again | |
| 51 merger.disconnect(); | |
| 52 compareOutputs(SimpleTest.finish); | |
| 53 }); | |
| 54 } | |
| 55 | |
| 56 function prepareTest() { | |
| 57 ctx = new AudioContext(); | |
| 58 | |
| 59 // The output of a test delay node with mono and stereo input will be | |
| 60 // compared with that of separate mono and stereo delay nodes. | |
| 61 const delayTime = 0.3 * bufferSize / ctx.sampleRate; | |
| 62 testDelay = ctx.createDelay(delayTime); | |
| 63 testDelay.delayTime.value = delayTime; | |
| 64 monoDelay = ctx.createDelay(delayTime); | |
| 65 monoDelay.delayTime.value = delayTime; | |
| 66 stereoDelay = ctx.createDelay(delayTime); | |
| 67 stereoDelay.delayTime.value = delayTime; | |
| 68 | |
| 69 // Create a one-channel signal and connect to the delay nodes | |
| 70 var monoOsc = ctx.createOscillator(); | |
| 71 monoOsc.frequency.value = 110; | |
| 72 monoOsc.connect(testDelay); | |
| 73 monoOsc.connect(monoDelay); | |
| 74 monoOsc.start(0); | |
| 75 | |
| 76 // Invert the expected so that mixing with the test will find the difference. | |
| 77 invertor = ctx.createGain(); | |
| 78 invertor.gain.value = -1.0; | |
| 79 monoDelay.connect(invertor); | |
| 80 stereoDelay.connect(invertor); | |
| 81 | |
| 82 // Start the test after the delay nodes have begun processing. | |
| 83 var processor = ctx.createScriptProcessor(bufferSize, 1, 0); | |
| 84 processor.connect(ctx.destination); | |
| 85 | |
| 86 processor.onaudioprocess = | |
| 87 function(e) { | |
| 88 e.target.onaudioprocess = null; | |
| 89 processor.disconnect(); | |
| 90 startTest(); | |
| 91 }; | |
| 92 } | |
| 93 prepareTest(); | |
| 94 </script> | |
| 95 </pre> | |
| 96 </body> | |
| 97 </html> |
