зеркало из https://github.com/mozilla/gecko-dev.git
76 строки
2.5 KiB
HTML
76 строки
2.5 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 processing is correct</title>
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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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<pre id="test">
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<script class="testbody" type="text/javascript">
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SimpleTest.waitForExplicitFinish();
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function test() {
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var audio = new Audio("small-shot.ogg");
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var context = new AudioContext();
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var node = context.createMediaStreamSource(audio.mozCaptureStreamUntilEnded());
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var sp = context.createScriptProcessor(2048, 1);
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node.connect(sp);
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sp.connect(context.destination); // work around bug 916387
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var expectedMinNonzeroSampleCount;
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var expectedMaxNonzeroSampleCount;
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var nonzeroSampleCount = 0;
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var complete = false;
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var iterationCount = 0;
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// This test ensures we receive at least expectedSampleCount nonzero samples
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function processSamples(e) {
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if (complete) {
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return;
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}
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if (iterationCount == 0) {
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// Don't start playing the audio until the AudioContext stuff is connected
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// and running.
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audio.play();
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}
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++iterationCount;
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var buf = e.inputBuffer.getChannelData(0);
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var nonzeroSamplesThisBuffer = 0;
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for (var i = 0; i < buf.length; ++i) {
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if (buf[i] != 0) {
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++nonzeroSamplesThisBuffer;
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}
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}
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nonzeroSampleCount += nonzeroSamplesThisBuffer;
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is(e.inputBuffer.numberOfChannels, 1,
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"Checking data channel count (nonzeroSamplesThisBuffer=" +
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nonzeroSamplesThisBuffer + ")");
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ok(nonzeroSampleCount <= expectedMaxNonzeroSampleCount,
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"Too many nonzero samples (got " + nonzeroSampleCount + ", expected max " + expectedMaxNonzeroSampleCount + ")");
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if (nonzeroSampleCount >= expectedMinNonzeroSampleCount &&
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nonzeroSamplesThisBuffer == 0) {
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ok(true,
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"Check received enough nonzero samples (got " + nonzeroSampleCount + ", expected min " + expectedMinNonzeroSampleCount + ")");
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SimpleTest.finish();
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complete = true;
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}
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}
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audio.oncanplaythrough = function() {
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// Use a fuzz factor of 100 to account for samples that just happen to be zero
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expectedMinNonzeroSampleCount = Math.floor(audio.duration*context.sampleRate) - 100;
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expectedMaxNonzeroSampleCount = Math.floor(audio.duration*context.sampleRate) + 500;
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sp.onaudioprocess = processSamples;
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};
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}
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SpecialPowers.pushPrefEnv({"set": [["media.preload.default", 2], ["media.preload.auto", 3]]}, test);
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</script>
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</pre>
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</body>
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</html>
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