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| 1 <!DOCTYPE HTML> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test tail time lifetime of DelayNode after input is disconnected</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 // Web Audio doesn't provide a means to precisely time disconnect()s but we | |
| 14 // can test that the output of delay nodes matches the output from their | |
| 15 // sources before they are disconnected. | |
| 16 | |
| 17 SimpleTest.waitForExplicitFinish(); | |
| 18 | |
| 19 const signalLength = 128; | |
| 20 const bufferSize = 4096; | |
| 21 const sourceCount = bufferSize / signalLength; | |
| 22 // Delay should be long enough to allow CC to run | |
| 23 var delayBufferCount = 20; | |
| 24 const delayLength = delayBufferCount * bufferSize; | |
| 25 | |
| 26 var sourceOutput = new Float32Array(bufferSize); | |
| 27 var delayOutputCount = 0; | |
| 28 var sources = []; | |
| 29 | |
| 30 function onDelayOutput(e) { | |
| 31 if (delayOutputCount < delayBufferCount) { | |
| 32 delayOutputCount++; | |
| 33 return; | |
| 34 } | |
| 35 | |
| 36 compareChannels(e.inputBuffer.getChannelData(0), sourceOutput); | |
| 37 e.target.onaudioprocess = null; | |
| 38 SimpleTest.finish(); | |
| 39 } | |
| 40 | |
| 41 function onSourceOutput(e) { | |
| 42 // Record the first buffer | |
| 43 e.inputBuffer.copyFromChannel(sourceOutput, 0); | |
| 44 e.target.onaudioprocess = null; | |
| 45 } | |
| 46 | |
| 47 function disconnectSources() { | |
| 48 for (var i = 0; i < sourceCount; ++i) { | |
| 49 sources[i].disconnect(); | |
| 50 } | |
| 51 | |
| 52 SpecialPowers.forceGC(); | |
| 53 SpecialPowers.forceCC(); | |
| 54 } | |
| 55 | |
| 56 function startTest() { | |
| 57 var ctx = new AudioContext(); | |
| 58 | |
| 59 var sourceProcessor = ctx.createScriptProcessor(bufferSize, 1, 0); | |
| 60 sourceProcessor.onaudioprocess = onSourceOutput; | |
| 61 // Keep audioprocess events going after source disconnect. | |
| 62 sourceProcessor.connect(ctx.destination); | |
| 63 | |
| 64 var delayProcessor = ctx.createScriptProcessor(bufferSize, 1, 0); | |
| 65 delayProcessor.onaudioprocess = onDelayOutput; | |
| 66 // Work around bug 916387. | |
| 67 delayProcessor.connect(ctx.destination); | |
| 68 | |
| 69 var delayDuration = delayLength / ctx.sampleRate; | |
| 70 for (var i = 0; i < sourceCount; ++i) { | |
| 71 var delay = ctx.createDelay(delayDuration); | |
| 72 delay.delayTime.value = delayDuration; | |
| 73 delay.connect(delayProcessor); | |
| 74 | |
| 75 var source = ctx.createOscillator(); | |
| 76 source.frequency.value = 440 + 10 * i | |
| 77 source.start(i * signalLength / ctx.sampleRate); | |
| 78 source.stop((i + 1) * signalLength / ctx.sampleRate); | |
| 79 source.connect(delay); | |
| 80 source.connect(sourceProcessor); | |
| 81 | |
| 82 sources[i] = source; | |
| 83 } | |
| 84 | |
| 85 // Assuming the above Web Audio operations have already scheduled an event | |
| 86 // to run in stable state and start the graph thread, schedule a subsequent | |
| 87 // event to disconnect the sources, which will remove main thread connection | |
| 88 // references before it knows the graph thread has started using the source | |
| 89 // streams. | |
| 90 SimpleTest.executeSoon(disconnectSources); | |
| 91 }; | |
| 92 | |
| 93 startTest(); | |
| 94 </script> | |
| 95 </pre> | |
| 96 </body> | |
| 97 </html> |
