| <!doctype html> |
| <html> |
| <head> |
| <script src="../resources/js-test.js"></script> |
| <script src="resources/compatibility.js"></script> |
| <script src="resources/audio-testing.js"></script> |
| <script src="resources/fft.js"></script> |
| <script src="resources/realtimeanalyser-testing.js"></script> |
| <title>Test AnalyserNode Downmixing</title> |
| </head> |
| |
| <body> |
| <script> |
| description("Test AnalyserNode Downmixing"); |
| window.jsTestIsAsync = true; |
| |
| var sampleRate = 44100; |
| var renderFrames = 2048; |
| |
| var audit = Audit.createTaskRunner(); |
| |
| var testConfigs = [{ |
| channelCount: 1, |
| message: "mono", |
| floatRelError: 6.3283e-8 |
| }, { |
| channelCount: 2, |
| message: "stereo", |
| floatRelError: 1.1681e-7 |
| }, { |
| channelCount: 4, |
| message: "quad", |
| floatRelError: 4.9793e-7 |
| }, { |
| channelCount: 6, |
| message: "5.1", |
| floatRelError: 2.0215e-7 |
| }, { |
| channelCount: 3, |
| message: "3-channel", |
| floatRelError: 6.3283e-8 |
| }]; |
| |
| // Create tasks for each entry in testConfigs |
| for (k in testConfigs) { |
| audit.defineTask(testConfigs[k].message, (function (config) { |
| return function(done) { |
| runTest(config).then(done); |
| }; |
| })(testConfigs[k])); |
| } |
| |
| audit.defineTask("finish", function (done) { |
| finishJSTest(); |
| done(); |
| }); |
| |
| audit.runTasks(); |
| |
| // Test downmixing of the AnalyserNode time data. We use the downmixing that automatically |
| // happens in the destination node to generate the reference data which is compared to the |
| // data that the Analyser node has captured. |
| function runTest(options) { |
| // Context MUST have exactly one channel so that we downmix the source to mono to generate |
| // the reference. |
| var context = new OfflineAudioContext(1, renderFrames, sampleRate); |
| |
| var channels = options.channelCount || 1; |
| var source = context.createBufferSource(); |
| |
| // The signals in each channel. Doesn't matter much what is in here, but it's best if the |
| // values aren't linearly increasing so that the average of the values isn't one of the |
| // values (in case the implementation does something silly). Only need to support up to 6 |
| // channels. |
| var bufferValues = [1, 2, 3, 4, 5, 6].map(function (x) { |
| return x * x |
| });; |
| source.buffer = createConstantBuffer(context, renderFrames, bufferValues.slice(0, channels)); |
| |
| var analyser = context.createAnalyser(); |
| analyser.smoothingTimeConstant = 0; |
| analyser.fftSize = 256; |
| |
| // Run analyser as an automatic pull node. Do NOT connect to the destination. We don't want |
| // the output of the analyser to mix in with the source that is also directly connected to |
| // the destination. |
| source.connect(analyser); |
| source.connect(context.destination); |
| |
| var timeData = new Float32Array(analyser.fftSize); |
| var freqData = new Float32Array(analyser.frequencyBinCount); |
| |
| var suspendFrame = analyser.fftSize; |
| context.suspend(suspendFrame / context.sampleRate).then(function () { |
| analyser.getFloatTimeDomainData(timeData); |
| analyser.getFloatFrequencyData(freqData); |
| }).then(context.resume.bind(context)); |
| |
| source.start(); |
| return context.startRendering().then(function (renderedBuffer) { |
| var success = true; |
| |
| // Verify the time domain data is correct. |
| var prefix = "Analyser downmix " + options.message + " to mono" |
| success = Should(prefix + " time data", timeData) |
| .beEqualToArray(renderedBuffer.getChannelData(0).subarray(0, analyser.fftSize)); |
| |
| var expectedTimeData = renderedBuffer.getChannelData(0).subarray(0, analyser.fftSize); |
| var fftOrder = Math.floor(Math.log2(analyser.fftSize)); |
| var expectedFreqData = computeFFTMagnitude(expectedTimeData, fftOrder).map(linearToDb); |
| |
| success = compareFloatFreq(prefix + " freq data", freqData, expectedFreqData, { |
| precision: 6, |
| floatRelError: options.floatRelError, |
| }) && success; |
| |
| if (success) |
| testPassed(prefix + " downmixed correctly.\n"); |
| else |
| testFailed(prefix + " not downmixed correctly.\n"); |
| }); |
| } |
| </script> |
| </body> |
| </html> |
