| OLD | NEW |
|---|
| (Empty) | |
| 1 <!doctype html> |
| 2 <html> |
| 3 <head> |
| 4 <script src="../resources/js-test.js"></script> |
| 5 <script src="resources/compatibility.js"></script> |
| 6 <script src="resources/audio-testing.js"></script> |
| 7 <script src="resources/fft.js"></script> |
| 8 <script src="resources/realtimeanalyser-testing.js"></script> |
| 9 <title>Test AnalyserNode Downmixing</title> |
| 10 </head> |
| 11 |
| 12 <body> |
| 13 <script> |
| 14 description("Test AnalyserNode Downmixing"); |
| 15 window.jsTestIsAsync = true; |
| 16 |
| 17 var sampleRate = 44100; |
| 18 var renderFrames = 2048; |
| 19 |
| 20 var audit = Audit.createTaskRunner(); |
| 21 |
| 22 var testConfigs = [{ |
| 23 channelCount: 1, |
| 24 message: "mono", |
| 25 floatRelError: 6.3283e-8 |
| 26 }, { |
| 27 channelCount: 2, |
| 28 message: "stereo", |
| 29 floatRelError: 1.1681e-7 |
| 30 }, { |
| 31 channelCount: 4, |
| 32 message: "quad", |
| 33 floatRelError: 4.9793e-7 |
| 34 }, { |
| 35 channelCount: 6, |
| 36 message: "5.1", |
| 37 floatRelError: 2.0215e-7 |
| 38 }, { |
| 39 channelCount: 3, |
| 40 message: "3-channel", |
| 41 floatRelError: 6.3283e-8 |
| 42 }]; |
| 43 |
| 44 // Create tasks for each entry in testConfigs |
| 45 for (k in testConfigs) { |
| 46 audit.defineTask(testConfigs[k].message, (function (config) { |
| 47 return function(done) { |
| 48 runTest(config).then(done); |
| 49 }; |
| 50 })(testConfigs[k])); |
| 51 } |
| 52 |
| 53 audit.defineTask("finish", function (done) { |
| 54 finishJSTest(); |
| 55 done(); |
| 56 }); |
| 57 |
| 58 audit.runTasks(); |
| 59 |
| 60 // Test downmixing of the AnalyserNode time data. We use the downmixing t
hat automatically |
| 61 // happens in the destination node to generate the reference data which is
compared to the |
| 62 // data that the Analyser node has captured. |
| 63 function runTest(options) { |
| 64 // Context MUST have exactly one channel so that we downmix the source t
o mono to generate |
| 65 // the reference. |
| 66 var context = new OfflineAudioContext(1, renderFrames, sampleRate); |
| 67 |
| 68 var channels = options.channelCount || 1; |
| 69 var source = context.createBufferSource(); |
| 70 |
| 71 // The signals in each channel. Doesn't matter much what is in here, but
it's best if the |
| 72 // values aren't linearly increasing so that the average of the values i
sn't one of the |
| 73 // values (in case the implementation does something silly). Only need
to support up to 6 |
| 74 // channels. |
| 75 var bufferValues = [1, 2, 3, 4, 5, 6].map(function (x) { |
| 76 return x * x |
| 77 });; |
| 78 source.buffer = createConstantBuffer(context, renderFrames, bufferValues
.slice(0, channels)); |
| 79 |
| 80 var analyser = context.createAnalyser(); |
| 81 analyser.smoothingTimeConstant = 0; |
| 82 analyser.fftSize = 256; |
| 83 |
| 84 // Run analyser as an automatic pull node. Do NOT connect to the destina
tion. We don't want |
| 85 // the output of the analyser to mix in with the source that is also dir
ectly connected to |
| 86 // the destination. |
| 87 source.connect(analyser); |
| 88 source.connect(context.destination); |
| 89 |
| 90 var timeData = new Float32Array(analyser.fftSize); |
| 91 var freqData = new Float32Array(analyser.frequencyBinCount); |
| 92 |
| 93 var suspendFrame = analyser.fftSize; |
| 94 context.suspend(suspendFrame / context.sampleRate).then(function () { |
| 95 analyser.getFloatTimeDomainData(timeData); |
| 96 analyser.getFloatFrequencyData(freqData); |
| 97 }).then(context.resume.bind(context)); |
| 98 |
| 99 source.start(); |
| 100 return context.startRendering().then(function (renderedBuffer) { |
| 101 var success = true; |
| 102 |
| 103 // Verify the time domain data is correct. |
| 104 var prefix = "Analyser downmix " + options.message + " to mono" |
| 105 success = Should(prefix + " time data", timeData, { |
| 106 verbose: true |
| 107 }) |
| 108 .beEqualToArray(renderedBuffer.getChannelData(0).subarray(0, analyse
r.fftSize)); |
| 109 |
| 110 var expectedTimeData = renderedBuffer.getChannelData(0).subarray(0, an
alyser.fftSize); |
| 111 var fftOrder = Math.floor(Math.log2(analyser.fftSize)); |
| 112 var expectedFreqData = computeFFTMagnitude(expectedTimeData, fftOrder)
.map(linearToDb); |
| 113 |
| 114 success = compareFloatFreq(prefix + " freq data", freqData, expectedFr
eqData, { |
| 115 precision: 6, |
| 116 floatRelError: options.floatRelError, |
| 117 }) && success; |
| 118 |
| 119 if (success) |
| 120 testPassed(prefix + " downmixed correctly.\n"); |
| 121 else |
| 122 testFailed(prefix + " not downmixed correctly.\n"); |
| 123 }); |
| 124 } |
| 125 </script> |
| 126 </body> |
| 127 </html> |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1803233002:
AnalyserNode should downmix channels to mono. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master