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<!DOCTYPE HTML>
<html>
<head>
<title>Test ConvolverNode after a GainNode - Bug 891254 </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">
const signalLength = 2048;
const responseLength = 100;
const outputLength = 4096; // > signalLength + responseLength
var gTest = {
length: outputLength,
numberOfChannels: 1,
createGraph: function(context) {
var buffer = context.createBuffer(1, signalLength, context.sampleRate);
for (var i = 0; i < signalLength; ++i) {
buffer.getChannelData(0)[i] = Math.sin(2 * Math.PI * i / signalLength);
}
var source = context.createBufferSource();
source.buffer = buffer;
source.start(0);
var response = context.createBuffer(1, responseLength, context.sampleRate);
for (var i = 0; i < responseLength; ++i) {
response.getChannelData(0)[i] = i / responseLength;
}
var gain = context.createGain();
gain.gain.value = -1;
source.connect(gain);
var convolver1 = context.createConvolver();
convolver1.buffer = response;
gain.connect(convolver1);
var convolver2 = context.createConvolver();
convolver2.buffer = response;
source.connect(convolver2);
// The output of convolver1 should be the inverse of convolver2, so blend
// them together and expect silence.
var blend = context.createGain();
convolver1.connect(blend);
convolver2.connect(blend);
return blend;
},
};
runTest();
</script>
</pre>
</body>
</html>
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