137 lines
4.4 KiB
HTML
137 lines
4.4 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<meta charset="utf-8">
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<head>
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<title>Test MediaStreamAudioSourceNode doesn't get data from cross-origin media resources</title>
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<script 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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<pre id="test">
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<script class="testbody" type="text/javascript">
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SimpleTest.waitForExplicitFinish();
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function binIndexForFrequency(frequency, analyser) {
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return 1 + Math.round(frequency *
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analyser.fftSize /
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analyser.context.sampleRate);
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}
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function debugCanvas(analyser) {
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var cvs = document.createElement("canvas");
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document.body.appendChild(cvs);
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// Easy: 1px per bin
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cvs.width = analyser.frequencyBinCount;
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cvs.height = 256;
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cvs.style.border = "1px solid red";
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var c = cvs.getContext('2d');
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var buf = new Uint8Array(analyser.frequencyBinCount);
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function render() {
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c.clearRect(0, 0, cvs.width, cvs.height);
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analyser.getByteFrequencyData(buf);
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for (var i = 0; i < buf.length; i++) {
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c.fillRect(i, (256 - (buf[i])), 1, 256);
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}
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requestAnimationFrame(render);
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}
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requestAnimationFrame(render);
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}
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function checkFrequency(an) {
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an.getFloatFrequencyData(frequencyArray);
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// We should have no energy when checking the data largely outside the index
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// for 440Hz (the frequency of the sine wave), start checking an octave above,
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// the Opus compression can add some harmonics to the pure since wave.
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var maxNoiseIndex = binIndexForFrequency(880, an);
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for (var i = maxNoiseIndex + 1; i < frequencyArray.length; i++) {
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if (frequencyArray[i] > frequencyArray[maxNoiseIndex]) {
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maxNoiseIndex = i;
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}
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}
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// On the other hand, we should find a peak at 440Hz. Our sine wave is not
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// attenuated, we're expecting the peak to reach 0dBFs.
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var index = binIndexForFrequency(440, an);
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info("energy at 440: " + frequencyArray[index] +
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", threshold " + (an.maxDecibels - 10) +
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"; max noise at index " + maxNoiseIndex +
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": " + frequencyArray[maxNoiseIndex] );
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if (frequencyArray[index] < (an.maxDecibels - 10)) {
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return false;
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}
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// Let some slack, there might be some noise here because of int -> float
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// conversion or the Opus encoding.
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if (frequencyArray[maxNoiseIndex] > an.minDecibels + 40) {
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return false;
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}
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return true;
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}
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var audioElement = new Audio();
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audioElement.src = 'sine-440-10s.opus'
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audioElement.loop = true;
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var ac = new AudioContext();
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var mediaElementSource = ac.createMediaElementSource(audioElement);
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var an = ac.createAnalyser();
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// Use no smoothing as this would just average with previous
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// getFloatFrequencyData() calls. Non-seamless looping would introduce noise,
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// and smoothing would spread this into calls after the loop point.
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an.smoothingTimeConstant = 0;
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let frequencyArray = new Float32Array(an.frequencyBinCount);
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// Uncomment this to check what the analyser is doing.
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// debugCanvas(an);
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mediaElementSource.connect(an)
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audioElement.play();
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// We want to check the we have the expected audio for at least two loop of
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// the HTMLMediaElement, piped into an AudioContext. The file is ten seconds,
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// and we use the default FFT size.
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var lastCurrentTime = 0;
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var loopCount = 0;
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audioElement.onplaying = function() {
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audioElement.ontimeupdate = function() {
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// We don't run the analysis when close to loop point or at the
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// beginning, since looping is not seamless, there could be an
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// unpredictable amount of silence
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var rv = checkFrequency(an);
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info("currentTime: " + audioElement.currentTime);
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if (audioElement.currentTime < 4 ||
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audioElement.currentTime > 8){
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return;
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}
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if (!rv) {
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ok(false, "Found unexpected noise during analysis.");
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audioElement.ontimeupdate = null;
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audioElement.onplaying = null;
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ac.close();
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audioElement.src = '';
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SimpleTest.finish()
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return;
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}
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ok(true, "Found correct audio signal during analysis");
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info(lastCurrentTime + " " + audioElement.currentTime);
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if (lastCurrentTime > audioElement.currentTime) {
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info("loopCount: " + loopCount);
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if (loopCount > 1) {
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audioElement.ontimeupdate = null;
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audioElement.onplaying = null;
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ac.close();
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audioElement.src = '';
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SimpleTest.finish();
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}
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lastCurrentTime = audioElement.currentTime;
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loopCount++;
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} else {
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lastCurrentTime = audioElement.currentTime;
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}
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}
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}
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</script>
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