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<!DOCTYPE HTML>
<html>
<head>
<title>Test AnalyserNode when the input is silent</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="webaudio.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
var ac = new AudioContext();
var analyser = ac.createAnalyser();
var constant = ac.createConstantSource();
var sp = ac.createScriptProcessor(2048, 1, 0);
constant.offset.value = 0.0;
constant.connect(analyser)
.connect(ac.destination);
constant.connect(sp);
var buf = new Float32Array(analyser.frequencyBinCount);
var iteration_count = 10;
sp.onaudioprocess = function() {
analyser.getFloatFrequencyData(buf);
var correct = true;
for (var i = 0; i < buf.length; i++) {
correct &= buf[i] == -Infinity;
}
ok(correct, "silent input process -Infinity in decibel bins");
if(!(iteration_count--)) {
sp.onaudioprocess = null;
constant.stop();
ac.close();
SimpleTest.finish();
}
}
constant.start();
});
</script>
</pre>
</body>
</html>
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