| <!DOCTYPE html> |
| <head> |
| <script src="../resources/js-test.js"></script> |
| <script src="resources/audio-testing.js"></script> |
| <script src="resources/audiobuffersource-testing.js"></script> |
| <script> |
| var sampleRate = 44100.0; |
| var lengthInSeconds = 0.1; |
| var context; |
| var source; |
| var sourceBuffer; |
| |
| function runTest() |
| { |
| jsTestIsAsync = true; |
| |
| numberOfFrames = sampleRate * lengthInSeconds; |
| context = new OfflineAudioContext(2, numberOfFrames, sampleRate); |
| sourceBuffer = createConstantBuffer(context, numberOfFrames, [0.5, 0.25]); |
| originalFirstChannel = sourceBuffer.getChannelData(0); |
| originalSecondChannel = sourceBuffer.getChannelData(1); |
| var data = sourceBuffer.getChannelData(0).buffer; |
| |
| var string = [ |
| "onmessage = function(e) {", |
| " var view = new Float32Array(e.data)", |
| " for (var i=0; i < view.length; i++)", |
| " view[i] = 100;", |
| " postMessage('done');", |
| "};" |
| ].join('\n'); |
| var blobURL = URL.createObjectURL(new Blob([string])); |
| |
| var worker = new Worker(blobURL); |
| worker.onmessage = workerReply; |
| worker.postMessage(data, [data]); |
| |
| // The length of the AudioBuffer should be unchanged, even if some of its audio channels buffers |
| // have been detached. |
| shouldBe("sourceBuffer.length", "numberOfFrames"); |
| |
| // getChannelData() should return a 0-length array if the channel buffer has been detached. |
| shouldBe("sourceBuffer.getChannelData(0).length", "0"); |
| shouldBeTrue("sourceBuffer.getChannelData(0) === sourceBuffer.getChannelData(0)"); |
| shouldBeTrue("sourceBuffer.getChannelData(0) === originalFirstChannel"); |
| |
| // getChannelData() should return accurate channel data for non detached channels. |
| shouldBe("sourceBuffer.getChannelData(1).length", "numberOfFrames"); |
| shouldBeTrue("sourceBuffer.getChannelData(1) === sourceBuffer.getChannelData(1)"); |
| shouldBeTrue("sourceBuffer.getChannelData(1) === originalSecondChannel"); |
| secondChannel = sourceBuffer.getChannelData(1); |
| for (var i = 0; i < numberOfFrames; ++i) { |
| if (secondChannel[i] != 0.25) { |
| testFailed("Second channel contained unexpected value: " + secondChannel[i]); |
| break; |
| } |
| } |
| } |
| |
| function workerReply(event) { |
| source = context.createBufferSource(); |
| source.buffer = sourceBuffer; |
| source.connect(context.destination); |
| source.start(0); |
| context.oncomplete = finishTest; |
| context.startRendering(); |
| } |
| |
| function finishTest(event) { |
| var renderedBuffer = event.renderedBuffer; |
| var numberOfFrames = sampleRate * lengthInSeconds; |
| // We expect silence on both channels. |
| var expectedBuffer = createConstantBuffer(context, numberOfFrames, [0, 0]); |
| |
| for (let channelIndex = 0; channelIndex < 2; channelIndex++) { |
| var renderedData = renderedBuffer.getChannelData(channelIndex); |
| var expectedData = expectedBuffer.getChannelData(channelIndex); |
| |
| for (var i = 0; i < numberOfFrames; ++i) { |
| if (expectedData[i] != renderedData[i]) { |
| testFailed('Channel ' + channelIndex + ' - expected: ' + expectedData[i] + ' actual: ' + renderedData[i]); |
| finishJSTest(); |
| } |
| } |
| } |
| |
| testPassed('Output matches expectations.'); |
| finishJSTest(); |
| } |
| |
| </script> |
| </head> |
| <body onload="runTest()"> |
| <div>Tests that neutered AudioBuffers produce silence</div> |
| <div id="console"></div> |
| </body> |
| |
| |
