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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Test AnalyserNode when the input is silent</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
setup({ single_test: true });
var ac = new AudioContext();
var analyser = ac.createAnalyser();
var constant = ac.createConstantSource();
var sp = ac.createScriptProcessor(2048, 1, 1);
constant.offset.value = 0.0;
constant.connect(analyser).connect(ac.destination);
constant.connect(sp).connect(ac.destination);
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;
}
assert_true(!!correct, "silent input process -Infinity in decibel bins");
if (!iteration_count--) {
sp.onaudioprocess = null;
constant.stop();
ac.close();
done();
}
};
constant.start();
</script>
</head>
</body>
</html>
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