gecko-dev/content/media/webaudio/test/test_delayNodeWithGain.html
Ehsan Akhgari 1275a7058a Bug 864605 - Take the input chunk's volume into account in the nodes that buffer their input; r=padenot
--HG--
extra : rebase_source : 7590e20cbb1ac347f3988aaa5dbc586012747221
2013-04-22 21:59:51 -04:00

63 lines
1.7 KiB
HTML

<!DOCTYPE HTML>
<html>
<head>
<title>Test DelayNode with a GainNode</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script src="webaudio.js" type="text/javascript"></script>
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
SpecialPowers.setBoolPref("media.webaudio.enabled", true);
var context = new AudioContext();
var buffer = context.createBuffer(1, 2048, context.sampleRate);
for (var i = 0; i < 2048; ++i) {
buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
}
var expectedBuffer = context.createBuffer(1, 2048 * 2, context.sampleRate);
for (var i = 2048; i < 2048 * 2; ++i) {
expectedBuffer.getChannelData(0)[i] = buffer.getChannelData(0)[i - 2048] / 2;
}
var destination = context.destination;
var source = context.createBufferSource();
var delay = context.createDelay();
source.buffer = buffer;
var gain = context.createGain();
gain.gain.value = 0.5;
source.connect(gain);
gain.connect(delay);
var sp = context.createScriptProcessor(2048 * 2, 1);
delay.connect(sp);
sp.connect(destination);
// Delay the source stream by 2048 frames
delay.delayTime.value = 2048 / context.sampleRate;
source.start(0);
sp.onaudioprocess = function(e) {
is(e.inputBuffer.numberOfChannels, 1, "Correct input channel count");
compareBuffers(e.inputBuffer.getChannelData(0), expectedBuffer.getChannelData(0));
sp.onaudioprocess = null;
SpecialPowers.clearUserPref("media.webaudio.enabled");
SimpleTest.finish();
};
});
</script>
</pre>
</body>
</html>