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<!DOCTYPE HTML>
<html>
<head>
<title>Test AnalyserNode when the input is scaled </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 context = new AudioContext();
var gain = context.createGain();
var analyser = context.createAnalyser();
var osc = context.createOscillator();
osc.connect(gain);
gain.connect(analyser);
osc.start();
var array = new Uint8Array(analyser.frequencyBinCount);
function getAnalyserData() {
gain.gain.setValueAtTime(currentGain, context.currentTime);
analyser.getByteTimeDomainData(array);
var max = -1;
for (var i = 0; i < array.length; i++) {
if (array[i] > max) {
max = Math.abs(array[i] - 128);
}
}
if (max <= currentGain * 128) {
ok(true, "Analyser got scaled data for " + currentGain);
currentGain = tests.shift();
if (currentGain == undefined) {
SimpleTest.finish();
return;
}
}
requestAnimationFrame(getAnalyserData);
}
var tests = [1.0, 0.5, 0.0];
var currentGain = tests.shift();
requestAnimationFrame(getAnalyserData);
});
</script>
</pre>
</body>
</html>
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