зеркало из https://github.com/mozilla/gecko-dev.git
56 строки
1.5 KiB
HTML
56 строки
1.5 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test the offset property on AudioBufferSourceNode</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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var fuzz = 0.3;
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if (navigator.platform.startsWith("Mac")) {
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// bug 895720
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fuzz = 0.6;
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}
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SimpleTest.waitForExplicitFinish();
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addLoadEvent(function() {
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var samplesFromSource = 0;
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var context = new AudioContext();
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var sp = context.createScriptProcessor(256);
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sp.onaudioprocess = function(e) {
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samplesFromSource += e.inputBuffer.length;
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}
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var buffer = context.createBuffer(1, context.sampleRate, context.sampleRate);
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for (var i = 0; i < context.sampleRate; ++i) {
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buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
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}
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var source = context.createBufferSource();
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source.onended = function(e) {
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// The timing at which the audioprocess and ended listeners are called can
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// change, hence the fuzzy equal here.
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var errorRatio = samplesFromSource / (0.5 * context.sampleRate);
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ok(errorRatio > (1.0 - fuzz) && errorRatio < (1.0 + fuzz),
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"Correct number of samples received (expected: " +
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(0.5 * context.sampleRate) + ", actual: " + samplesFromSource + ").");
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SimpleTest.finish();
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};
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source.buffer = buffer;
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source.connect(sp);
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source.start(0, 0.5);
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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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