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47 lines
1.2 KiB
HTML
47 lines
1.2 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test whether an audio file played with a volume set to 0 plays silence</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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<audio preload=none src="ting-48k-1ch.ogg" controls> </audio>
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<script>
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SimpleTest.waitForExplicitFinish();
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var count = 20;
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function isSilent(b) {
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for (var i = 0; i < b.length; b++) {
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if (b[i] != 0.0) {
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return false;
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}
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}
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return true;
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}
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var a = document.getElementsByTagName("audio")[0];
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a.volume = 0.0;
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var ac = new AudioContext();
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var measn = ac.createMediaElementSource(a);
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var sp = ac.createScriptProcessor();
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sp.onaudioprocess = function(e) {
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var inputBuffer = e.inputBuffer.getChannelData(0);
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ok(isSilent(inputBuffer), "The volume is set to 0, so all the elements of the buffer are supposed to be equal to 0.0");
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}
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// Connect the MediaElementAudioSourceNode to the ScriptProcessorNode to check
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// the audio volume.
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measn.connect(sp);
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a.play();
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a.addEventListener("ended", function() {
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sp.onaudioprocess = null;
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SimpleTest.finish();
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});
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</script>
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</body>
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</html>
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