| <!doctype html> |
| <html> |
| <head> |
| <script src="../resources/js-test.js"></script> |
| <script src="resources/compatibility.js"></script> |
| <script src="resources/audio-testing.js"></script> |
| <title>Test Multiple Calls to getFloatFrequencyData</title> |
| </head> |
| |
| <body> |
| <script> |
| description("Test AnalyserNode getFloatFrequencyData and getByteFrequencyData"); |
| window.jsTestIsAsync = true; |
| |
| var sampleRate = 48000; |
| // Render enough data to run the test. |
| var renderFrames = 2*1024; |
| var renderDuration = renderFrames / sampleRate; |
| |
| var audit = Audit.createTaskRunner(); |
| |
| audit.defineTask("test", function (done) { |
| |
| var context = new OfflineAudioContext(1, renderFrames, sampleRate); |
| |
| // Use sawtooth oscillator as the source because it has quite a bit of harmonic content. |
| // Otherwise, the type doesn't really matter. |
| var osc = context.createOscillator(); |
| osc.type = "sawtooth"; |
| |
| // Create an analyser with 256-point FFT. The FFT size doesn't really matter much. |
| var analyser = context.createAnalyser(); |
| analyser.fftSize = 256; |
| |
| osc.connect(analyser); |
| analyser.connect(context.destination); |
| |
| var success = true; |
| |
| // Suspend after getting a full analyser frame. (Not really necessary, but it's nice that |
| // the frame doesn't include any initial zeroes. |
| var suspendFrame = analyser.fftSize; |
| context.suspend(suspendFrame / sampleRate).then(function () { |
| // Test successive calls to getFloatFrequencyData in the same rendering quantum. |
| var f1 = new Float32Array(analyser.frequencyBinCount); |
| var f2 = new Float32Array(analyser.frequencyBinCount); |
| |
| analyser.getFloatFrequencyData(f1); |
| analyser.getFloatFrequencyData(f2); |
| |
| success = Should("Second call to getFloatFrequencyData", f2, { |
| precision: 5 |
| }).beEqualToArray(f1) && success; |
| }).then(context.resume.bind(context)); |
| |
| suspendFrame += 128; |
| context.suspend(suspendFrame / sampleRate).then(function () { |
| // Test successive calls to getByteFrequencyData in the same rendering quantum. |
| var f1 = new Uint8Array(analyser.frequencyBinCount); |
| var f2 = new Uint8Array(analyser.frequencyBinCount); |
| |
| analyser.getByteFrequencyData(f1); |
| analyser.getByteFrequencyData(f2); |
| |
| success = Should("Second call to getByteFrequencyData", f2) |
| .beEqualToArray(f1) && success; |
| }).then(context.resume.bind(context)); |
| |
| suspendFrame += 128; |
| context.suspend(suspendFrame / sampleRate).then(function () { |
| // Test calls to getFloatFrequencyData followed by getByteFrequencyData. The float data, |
| // when converted to byte values should be identical to the result from |
| // getByteFrequencyData. |
| var f1 = new Float32Array(analyser.frequencyBinCount); |
| var f2 = new Uint8Array(analyser.frequencyBinCount); |
| |
| analyser.getFloatFrequencyData(f1); |
| analyser.getByteFrequencyData(f2); |
| |
| var byteValuesFromFloat = convertFloatToByte(f1, analyser.minDecibels, analyser.maxDecibels); |
| success = Should("Output of getByteFrequencyData after getFloatFrequencyData", |
| byteValuesFromFloat) |
| .beEqualToArray(f2) && success; |
| }).then(context.resume.bind(context)); |
| |
| suspendFrame += 128; |
| context.suspend(suspendFrame / sampleRate).then(function () { |
| // Test calls to getByteFrequencyData followed by getFloatFrequencyData. The float data, |
| // when converted to byte values should be identical to the result from |
| // getByteFrequencyData. |
| var f1 = new Uint8Array(analyser.frequencyBinCount); |
| var f2 = new Float32Array(analyser.frequencyBinCount); |
| |
| analyser.getByteFrequencyData(f1); |
| analyser.getFloatFrequencyData(f2); |
| |
| var byteValuesFromFloat = convertFloatToByte(f2, analyser.minDecibels, analyser.maxDecibels); |
| success = Should( |
| "Output of getFloatFrequenycData (converted to byte) after getByteFrequencyData", |
| f1) |
| .beEqualToArray(byteValuesFromFloat) && success; |
| }).then(context.resume.bind(context)); |
| |
| osc.start(); |
| context.startRendering().then(done); |
| }); |
| |
| audit.defineTask("finish", function (done) { |
| finishJSTest(); |
| done(); |
| }); |
| |
| audit.runTasks(); |
| |
| // Convert the float frequency data (in dB), |floatFreqData|, to byte values using the dB |
| // limits |minDecibels| and |maxDecibels|. The new byte array is returned. |
| function convertFloatToByte(floatFreqData, minDecibels, maxDecibels) { |
| var scale = 255 / (maxDecibels - minDecibels); |
| |
| return floatFreqData.map(function (x) { |
| var value = Math.floor(scale * (x - minDecibels)); |
| return Math.min(255, Math.max(0, value)); |
| }); |
| } |
| </script> |
| </body> |
| </html> |
