зеркало из https://github.com/mozilla/gecko-dev.git
52 строки
1.2 KiB
HTML
52 строки
1.2 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test AnalyserNode when the input is silent</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<script type="text/javascript" src="webaudio.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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addLoadEvent(function() {
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var ac = new AudioContext();
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var analyser = ac.createAnalyser();
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var constant = ac.createConstantSource();
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var sp = ac.createScriptProcessor(2048, 1, 0);
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constant.offset.value = 0.0;
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constant.connect(analyser)
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.connect(ac.destination);
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constant.connect(sp);
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var buf = new Float32Array(analyser.frequencyBinCount);
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var iteration_count = 10;
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sp.onaudioprocess = function() {
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analyser.getFloatFrequencyData(buf);
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var correct = true;
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for (var i = 0; i < buf.length; i++) {
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correct &= buf[i] == -Infinity;
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}
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ok(correct, "silent input process -Infinity in decibel bins");
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if(!(iteration_count--)) {
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sp.onaudioprocess = null;
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constant.stop();
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ac.close();
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SimpleTest.finish();
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}
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}
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constant.start();
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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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