| <!DOCTYPE html> |
| <html> |
| <head> |
| <script src="../resources/js-test.js"></script> |
| <script type="text/javascript" src="resources/audio-testing.js"></script> |
| </head> |
| |
| <body> |
| |
| <div id="description"></div> |
| <div id="console"></div> |
| |
| <script> |
| description("Tests AudioProcessingEvent attributes in IDL."); |
| |
| var sampleRate = 44100.0; |
| |
| // For the current implementation of ScriptProcessorNode, when it works with OfflineAudioContext (which runs much faster |
| // than real-time) the event.inputBuffer might be overwrite again before onaudioprocess ever get chance to be called. |
| // We carefully arrange the renderLengthInFrames and bufferSize to have exactly the same value to avoid this issue. |
| var renderLengthInFrames = 512; |
| var bufferSize = 512; |
| var duration = 5; |
| var frequency = 100; |
| var context; |
| |
| function processAudioData(event) { |
| shouldBeDefined("event.playbackTime"); |
| shouldBeDefined("event.inputBuffer"); |
| shouldBeDefined("event.outputBuffer"); |
| |
| var expectedTime = context.currentTime + (bufferSize / context.sampleRate); |
| var allowedTimeGap = 0.0000001; |
| |
| // There may be a little time gap which is from different thread operation |
| // between currentTime when main thread fires onaudioprocess() and currenTime when read in JS |
| // since currentTime is continuously increasing on audio thread. |
| shouldBeCloseTo("event.playbackTime", expectedTime, allowedTimeGap, true); |
| } |
| |
| function runTest() { |
| window.jsTestIsAsync = true; |
| |
| // Create offline audio context. |
| context = new webkitOfflineAudioContext(2, renderLengthInFrames, sampleRate); |
| |
| var oscillator = context.createOscillator(); |
| |
| oscillator.frequency.value = frequency; |
| oscillator.type = 0; |
| |
| var scriptProcessorNode = context.createScriptProcessor(bufferSize, 1, 1); |
| |
| oscillator.connect(scriptProcessorNode); |
| scriptProcessorNode.onaudioprocess = processAudioData; |
| |
| var gainNode = context.createGain(); |
| |
| scriptProcessorNode.connect(gainNode); |
| gainNode.connect(context.destination); |
| gainNode.gain.value = 2; |
| |
| var startTime = context.currentTime; |
| |
| oscillator.start(startTime); |
| oscillator.stop(startTime + duration); |
| |
| context.oncomplete = finishJSTest; |
| context.startRendering(); |
| } |
| |
| runTest(); |
| |
| </script> |
| </body> |
| </html> |
