зеркало из https://github.com/mozilla/gecko-dev.git
110 строки
3.8 KiB
HTML
110 строки
3.8 KiB
HTML
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<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test AudioCapture </title>
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<script type="application/javascript" src="mediaStreamPlayback.js"></script>
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</head>
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<body>
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<pre id="test">
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<script>
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createHTML({
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bug: "1156472",
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title: "Test AudioCapture with regular HTMLMediaElement, AudioContext, and HTMLMediaElement playing a MediaStream",
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visible: true
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});
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scriptsReady
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.then(() => FAKE_ENABLED = false)
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.then(() => {
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runTestWhenReady(function() {
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// Get an opus file containing a sine wave at maximum amplitude, of duration
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// `lengthSeconds`, and of frequency `frequency`.
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function getSineWaveFile(frequency, lengthSeconds, callback) {
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var chunks = [];
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var off = new OfflineAudioContext(1, lengthSeconds * 48000, 48000);
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var osc = off.createOscillator();
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var rec = new MediaRecorder(osc);
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rec.ondataavailable = function(e) {
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chunks.push(e.data);
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};
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rec.onstop = function(e) {
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var blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
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callback(blob);
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}
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osc.frequency.value = frequency;
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osc.start();
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rec.start();
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off.startRendering().then(function(buffer) {
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rec.stop();
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});
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}
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/**
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* Get two HTMLMediaElements:
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* - One playing a sine tone from a blob (of an opus file created on the fly)
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* - One being the output for an AudioContext's OscillatorNode, connected to
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* a MediaSourceDestinationNode.
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*
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* Also, use the AudioContext playing through its AudioDestinationNode another
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* tone, using another OscillatorNode.
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*
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* Capture the output of the document, feed that back into the AudioContext,
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* with an AnalyserNode, and check the frequency content to make sure we
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* have recorded the three sources.
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*
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* The three sine tones have frequencies far apart from each other, so that we
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* can check that the spectrum of the capture stream contains three
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* components with a high magnitude.
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*/
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var wavtone = createMediaElement("audio", "WaveTone");
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var acTone = createMediaElement("audio", "audioContextTone");
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var ac = new AudioContext();
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var oscThroughMediaElement = ac.createOscillator();
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oscThroughMediaElement.frequency.value = 1000;
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var oscThroughAudioDestinationNode = ac.createOscillator();
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oscThroughAudioDestinationNode.frequency.value = 5000;
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var msDest = ac.createMediaStreamDestination();
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oscThroughMediaElement.connect(msDest);
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oscThroughAudioDestinationNode.connect(ac.destination);
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acTone.mozSrcObject = msDest.stream;
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getSineWaveFile(10000, 10, function(blob) {
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wavtone.src = URL.createObjectURL(blob);
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oscThroughMediaElement.start();
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oscThroughAudioDestinationNode.start();
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wavtone.loop = true;
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wavtone.play();
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acTone.play();
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});
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var constraints = {audio: {mediaSource: "audioCapture"}};
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return getUserMedia(constraints).then((stream) => {
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window.grip = stream;
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var analyser = new AudioStreamAnalyser(ac, stream);
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analyser.enableDebugCanvas();
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return analyser.waitForAnalysisSuccess(function(array) {
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// We want to find three frequency components here, around 1000, 5000
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// and 10000Hz. Frequency are logarithmic. Also make sure we have low
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// energy in between, not just a flat white noise.
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return (array[analyser.binIndexForFrequency(50)] < 50 &&
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array[analyser.binIndexForFrequency(1000)] > 200 &&
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array[analyser.binIndexForFrequency(2500)] < 50 &&
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array[analyser.binIndexForFrequency(5000)] > 200 &&
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array[analyser.binIndexForFrequency(7500)] < 50 &&
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array[analyser.binIndexForFrequency(10000)] > 200);
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}).then(finish);
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}).catch(finish);
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});
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});
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</script>
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</pre>
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</body>
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</html>
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