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263 lines
7.6 KiB
HTML
263 lines
7.6 KiB
HTML
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<!DOCTYPE HTML>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=490705
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-->
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<head>
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<title>Media test: simple audioAvalailable event checks</title>
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<script type="text/javascript" src="/MochiKit/packed.js"></script>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=490705">Mozilla Bug 490705</a>
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<!-- mute audio, since there is no need to hear the sound for these tests -->
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<audio id='a1' onerror="event.stopPropagation();" controls></audio>
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<pre id="test">
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<script class="testbody" type="text/javascript">
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/**
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* FFT is a class for calculating the Discrete Fourier Transform of a signal
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* with the Fast Fourier Transform algorithm.
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*
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* Source: github.com/corbanbrook/dsp.js; License: MIT; Copyright: Corban Brook
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*
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* @param {Number} bufferSize The size of the sample buffer to be computed. Must be power of 2
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* @param {Number} sampleRate The sampleRate of the buffer (eg. 44100)
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*
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* @constructor
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*/
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FFT = function(bufferSize, sampleRate) {
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this.bufferSize = bufferSize;
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this.sampleRate = sampleRate;
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this.spectrum = new Float32Array(bufferSize/2);
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this.real = new Float32Array(bufferSize);
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this.imag = new Float32Array(bufferSize);
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this.reverseTable = new Uint32Array(bufferSize);
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var limit = 1;
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var bit = bufferSize >> 1;
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while ( limit < bufferSize ) {
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for ( var i = 0; i < limit; i++ ) {
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this.reverseTable[i + limit] = this.reverseTable[i] + bit;
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}
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limit = limit << 1;
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bit = bit >> 1;
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}
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this.sinTable = new Float32Array(bufferSize);
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this.cosTable = new Float32Array(bufferSize);
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for ( var i = 0; i < bufferSize; i++ ) {
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this.sinTable[i] = Math.sin(-Math.PI/i);
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this.cosTable[i] = Math.cos(-Math.PI/i);
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}
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};
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/**
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* Performs a forward tranform on the sample buffer.
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* Converts a time domain signal to frequency domain spectra.
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*
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* @param {Array} buffer The sample buffer. Buffer Length must be power of 2
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*
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* @returns The frequency spectrum array
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*/
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FFT.prototype.forward = function(buffer) {
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// Locally scope variables for speed up
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var bufferSize = this.bufferSize,
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cosTable = this.cosTable,
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sinTable = this.sinTable,
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reverseTable = this.reverseTable,
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real = this.real,
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imag = this.imag,
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spectrum = this.spectrum;
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var k = Math.floor(Math.log(bufferSize) / Math.LN2);
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if ( Math.pow(2, k) !== bufferSize ) {
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throw "Invalid buffer size, must be a power of 2.";
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}
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if ( bufferSize !== buffer.length ) {
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throw "Supplied buffer is not the same size as defined FFT. FFT Size: " + bufferSize + " Buffer Size: " + buffer.length;
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}
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for ( var i = 0; i < bufferSize; i++ ) {
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real[i] = buffer[reverseTable[i]];
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imag[i] = 0;
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}
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var halfSize = 1,
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phaseShiftStepReal,
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phaseShiftStepImag,
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currentPhaseShiftReal,
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currentPhaseShiftImag,
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off,
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tr,
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ti,
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tmpReal,
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i;
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while ( halfSize < bufferSize ) {
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phaseShiftStepReal = cosTable[halfSize];
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phaseShiftStepImag = sinTable[halfSize];
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currentPhaseShiftReal = 1;
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currentPhaseShiftImag = 0;
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for ( var fftStep = 0; fftStep < halfSize; fftStep++ ) {
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i = fftStep;
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while ( i < bufferSize ) {
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off = i + halfSize;
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tr = (currentPhaseShiftReal * real[off]) - (currentPhaseShiftImag * imag[off]);
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ti = (currentPhaseShiftReal * imag[off]) + (currentPhaseShiftImag * real[off]);
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real[off] = real[i] - tr;
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imag[off] = imag[i] - ti;
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real[i] += tr;
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imag[i] += ti;
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i += halfSize << 1;
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}
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tmpReal = currentPhaseShiftReal;
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currentPhaseShiftReal = (tmpReal * phaseShiftStepReal) - (currentPhaseShiftImag * phaseShiftStepImag);
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currentPhaseShiftImag = (tmpReal * phaseShiftStepImag) + (currentPhaseShiftImag * phaseShiftStepReal);
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}
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halfSize = halfSize << 1;
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}
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i = bufferSize/2;
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while(i--) {
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spectrum[i] = 2 * Math.sqrt(real[i] * real[i] + imag[i] * imag[i]) / bufferSize;
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}
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return spectrum;
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};
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/* end of FFT */
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var testFile = "file_a4_tone.ogg";
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var testFileDuration = 3.0;
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var testFileChannelCount = 1;
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var testFileSampleRate = 44100;
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var testFileFrameBufferLength = 1024;
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var signal = [{start:1.1, end: 1.9, fftBin: 10 } ];
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var noSignal = [{start:0.1, end: 0.9 }, {start:2.1, end: 2.9 } ];
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var undef;
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var fft, fftBufferSize;
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var currentSampleOffset = 0;
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var spectrumMaxs = [];
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var isTimePropertyValid = true;
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function audioAvailable(event) {
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var buffer = event.frameBuffer;
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if(fft === undef) {
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fftBufferSize = buffer.length;
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fft = new FFT(fftBufferSize, testFileSampleRate);
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}
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fft.forward(buffer);
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var spectrum = fft.spectrum;
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// Finding pick frequency
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var maxIndex = 0, maxValue = spectrum[0];
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for(var i=0;i<spectrum.length;i++) {
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if(maxValue < spectrum[i]) {
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maxValue = spectrum[maxIndex = i];
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}
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}
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spectrumMaxs.push({ value: maxValue, index: maxIndex, time: (currentSampleOffset / testFileSampleRate) });
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if( (typeof event.time !== "number") ||
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(Math.abs(event.time - currentSampleOffset / testFileSampleRate) > 0.01) ) {
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isTimePropertyValid = false;
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}
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currentSampleOffset += buffer.length;
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}
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var loadedMetadataCalled = false;
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function loadedMetadata() {
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loadedMetadataCalled = true;
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var a1 = document.getElementById('a1');
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is(a1.mozChannels, testFileChannelCount, "mozChannels should be " + testFileChannelCount + ".");
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is(a1.mozSampleRate, testFileSampleRate, "mozSampleRate should be " + testFileSampleRate + ".");
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is(a1.mozFrameBufferLength, testFileFrameBufferLength, "mozFrameBufferLength should be " + testFileFrameBufferLength + ".");
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}
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function checkResults() {
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ok(loadedMetadataCalled, "loadedmetadata event not dispatched.");
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ok(isTimePropertyValid, "The audioAvailable event's time attribute was invalid.");
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var expectedOffset = Math.ceil(testFileDuration * testFileSampleRate);
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if(expectedOffset % fftBufferSize !== 0) { expectedOffset += (fftBufferSize - (expectedOffset % fftBufferSize)); }
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is(currentSampleOffset, expectedOffset, "Check amount of signal data processed");
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var i, j;
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var signalPresent = true;
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for(i=0;i<signal.length;++i) {
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var signalAnalysed = false;
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for(j=0;j<spectrumMaxs.length;++j) {
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if(signal[i].start <= spectrumMaxs[j].time && spectrumMaxs[j].time < signal[i].end) {
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signalAnalysed = true;
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signalPresent = spectrumMaxs[j].index == signal[i].fftBin;
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}
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if(!signalPresent) break;
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}
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if(!signalAnalysed) signalPresent = false;;
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if(!signalPresent) break;
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}
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is(signalPresent, true, "Check signal present");
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var noSignalPresent = true;
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for(i=0;i<noSignal.length;++i) {
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var signalAnalysed = false;
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for(j=0;j<spectrumMaxs.length;++j) {
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if(noSignal[i].start <= spectrumMaxs[j].time && spectrumMaxs[j].time < noSignal[i].end) {
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signalAnalysed = true;
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noSignalPresent = spectrumMaxs[j].index == 0;
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}
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if(!noSignalPresent) break;
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}
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if(!signalAnalysed) noSignalPresent = false;;
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if(!noSignalPresent) break;
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}
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is(signalPresent, true, "Check mute fragments present");
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SimpleTest.finish();
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}
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function audioEnded() {
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checkResults();
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}
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function initTest() {
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var a1 = document.getElementById('a1');
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a1.addEventListener("ended", audioEnded, false);
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a1.addEventListener("loadedmetadata", loadedMetadata, false);
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a1.addEventListener("MozAudioAvailable", audioAvailable, false);
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a1.src = testFile;
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a1.muted = true;
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a1.play();
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}
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window.addEventListener("load", function(e) {
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initTest();
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}, false);
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SimpleTest.waitForExplicitFinish();
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</script>
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</pre>
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</body>
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</html>
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