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