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content/media/webaudio/test/test_delayNodeTailIncrease.html
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| -1:000000000000 | 0:2baae8578f56 |
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| 1 <!DOCTYPE HTML> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test increasing delay of DelayNode after input finishes</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 signalLength = 100; | |
| 16 const bufferSize = 1024; | |
| 17 // Delay should be long enough to allow CC to run | |
| 18 const delayBufferCount = 50; | |
| 19 const delayLength = delayBufferCount * bufferSize + 700; | |
| 20 | |
| 21 var count = 0; | |
| 22 | |
| 23 function applySignal(buffer, offset) { | |
| 24 for (var i = 0; i < signalLength; ++i) { | |
| 25 buffer.getChannelData(0)[offset + i] = Math.cos(Math.PI * i / signalLength); | |
| 26 } | |
| 27 } | |
| 28 | |
| 29 function onAudioProcess(e) { | |
| 30 switch(count) { | |
| 31 case 5: | |
| 32 SpecialPowers.forceGC(); | |
| 33 SpecialPowers.forceCC(); | |
| 34 break; | |
| 35 case delayBufferCount: | |
| 36 var offset = delayLength - count * bufferSize; | |
| 37 var ctx = e.target.context; | |
| 38 var expected = ctx.createBuffer(1, bufferSize, ctx.sampleRate); | |
| 39 applySignal(expected, offset); | |
| 40 compareBuffers(e.inputBuffer, expected); | |
| 41 SimpleTest.finish(); | |
| 42 } | |
| 43 count++; | |
| 44 } | |
| 45 | |
| 46 function startTest() { | |
| 47 var ctx = new AudioContext(); | |
| 48 var processor = ctx.createScriptProcessor(bufferSize, 1, 0); | |
| 49 processor.onaudioprocess = onAudioProcess; | |
| 50 | |
| 51 // Switch on delay at a time in the future. | |
| 52 var delayDuration = delayLength / ctx.sampleRate; | |
| 53 var delayStartTime = (delayLength - bufferSize) / ctx.sampleRate; | |
| 54 var delay = ctx.createDelay(delayDuration); | |
| 55 delay.delayTime.setValueAtTime(delayDuration, delayStartTime); | |
| 56 delay.connect(processor); | |
| 57 | |
| 58 // Short signal that finishes before switching to long delay | |
| 59 var buffer = ctx.createBuffer(1, signalLength, ctx.sampleRate); | |
| 60 applySignal(buffer, 0); | |
| 61 var source = ctx.createBufferSource(); | |
| 62 source.buffer = buffer; | |
| 63 source.start(); | |
| 64 source.connect(delay); | |
| 65 }; | |
| 66 | |
| 67 startTest(); | |
| 68 </script> | |
| 69 </pre> | |
| 70 </body> | |
| 71 </html> |
