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| 1 <!DOCTYPE html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>ScriptProcessorNode on OfflineAudioContext</title> | |
| 5 <script src="../resources/testharness.js"></script> | |
| 6 <script src="../resources/testharnessreport.js"></script> | |
| 7 <script src="resources/audit-util.js"></script> | |
| 8 <script src="resources/audio-testing.js"></script> | |
| 9 </head> | |
| 10 <body> | |
| 11 <script> | |
| 12 var audit = Audit.createTaskRunner(); | |
| 13 | |
| 14 | |
| 15 // Fill the output of script processor with a constant value. | |
| 16 audit.defineTask('simple-output', function (taskDone) { | |
| 17 var sampleRate = 44100; | |
| 18 var scriptBufferSize = 256; | |
| 19 var renderLength = 1; | |
| 20 var PI = Math.fround(Math.PI); | |
| 21 | |
| 22 var context = new OfflineAudioContext( | |
| 23 1, renderLength * sampleRate, sampleRate); | |
| 24 | |
| 25 var scriptNode = context.createScriptProcessor(scriptBufferSize, 1, 1); | |
| 26 scriptNode.onaudioprocess = function (event) { | |
| 27 var outputChannel = event.outputBuffer.getChannelData(0); | |
| 28 outputChannel.fill(PI); | |
| 29 }; | |
| 30 scriptNode.connect(context.destination); | |
| 31 | |
| 32 context.startRendering().then(function (buffer) { | |
| 33 var channel = buffer.getChannelData(0); | |
| 34 var initialDelay = channel.subarray(0, 2 * scriptBufferSize); | |
| 35 var actualContent = channel.subarray(2 * scriptBufferSize); | |
| 36 | |
| 37 // There is the initial delay (2 x buffer size) which is silent. | |
| 38 Should('The initial delay contains zeros.', initialDelay) | |
| 39 .beConstantValueOf(0); | |
| 40 | |
| 41 // After the initial delay, we must get |PI|. | |
| 42 Should('The actual content contains ' + PI, actualContent) | |
| 43 .beConstantValueOf(PI); | |
| 44 | |
| 45 taskDone(); | |
| 46 }); | |
| 47 }); | |
| 48 | |
| 49 | |
| 50 // Pass through an oscillator via a script processor. Sum with the | |
| 51 // phase-inverted oscillator with the delayed start time. Verify the | |
| 52 // rendered buffer is completely silent. | |
| 53 audit.defineTask('oscillator-output', function (taskDone) { | |
| 54 var sampleRate = 44100; | |
| 55 var scriptBufferSize = 256; | |
| 56 var renderLength = 1; | |
| 57 | |
| 58 var context = new OfflineAudioContext( | |
| 59 1, renderLength * sampleRate, sampleRate); | |
| 60 | |
| 61 var osc1 = context.createOscillator(); | |
| 62 var osc2 = context.createOscillator(); | |
| 63 var inverter = context.createGain(); | |
| 64 var scriptNode = context.createScriptProcessor(scriptBufferSize, 1, 1); | |
| 65 scriptNode.onaudioprocess = function (event) { | |
| 66 var inputChannel = event.inputBuffer.getChannelData(0); | |
| 67 var outputChannel = event.outputBuffer.getChannelData(0); | |
| 68 outputChannel.set(inputChannel); | |
| 69 }; | |
| 70 | |
| 71 inverter.gain.value = -1; | |
| 72 | |
| 73 osc1.connect(inverter).connect(context.destination); | |
| 74 osc2.connect(scriptNode).connect(context.destination); | |
| 75 | |
| 76 // The delayed start for |osc1|. | |
| 77 osc1.start((2 * scriptBufferSize) / sampleRate); | |
| 78 osc2.start(); | |
| 79 | |
| 80 context.startRendering().then(function (buffer) { | |
| 81 var channel = buffer.getChannelData(0); | |
| 82 | |
| 83 // The rendered buffer must be silent. | |
| 84 Should('The rendered buffer', channel) | |
| 85 .beConstantValueOf(0); | |
| 86 | |
| 87 taskDone(); | |
| 88 }); | |
| 89 }); | |
| 90 | |
| 91 | |
| 92 audit.runTasks(); | |
| 93 </script> | |
| 94 </body> | |
| 95 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
