gecko-dev/dom/media/webaudio/test/test_maxChannelCount.html

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<!DOCTYPE HTML>
<html>
<head>
<title>Test the AudioContext.destination interface</title>
<script type="text/javascript" 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">
// Work around bug 911777
SpecialPowers.forceGC();
SpecialPowers.forceCC();
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
var ac = new AudioContext();
ok(ac.destination.maxChannelCount > 0, "We can query the maximum number of channels");
var oac = new OfflineAudioContext(2, 1024, 48000);
ok(oac.destination.maxChannelCount, 2, "This OfflineAudioContext should have 2 max channels.");
oac = new OfflineAudioContext(6, 1024, 48000);
ok(oac.destination.maxChannelCount, 6, "This OfflineAudioContext should have 6 max channels.");
expectException(function() {
oac.destination.channelCount = oac.destination.channelCount + 1;
}, DOMException.INDEX_SIZE_ERR);
SimpleTest.finish();
});
</script>
</pre>
</body>
</html>