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<!DOCTYPE HTML>
<html>
<head>
<title>Test BiquadFilterNode after a GainNode and tail - Bugs 924286 and 924288</title>
<script 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;
var gTest = {
length: signalLength,
numberOfChannels: 1,
createGraph(context) {
// Two oscillators scheduled sequentially
var signalDuration = signalLength / context.sampleRate;
var osc1 = context.createOscillator();
osc1.type = "square";
osc1.start(0);
osc1.stop(signalDuration / 2);
var osc2 = context.createOscillator();
osc2.start(signalDuration / 2);
osc2.stop(signalDuration);
// Comparing a biquad on each source with one on both sources checks that
// the biquad on the first source doesn't shut down early.
var biquad1 = context.createBiquadFilter();
osc1.connect(biquad1);
var biquad2 = context.createBiquadFilter();
osc2.connect(biquad2);
var gain = context.createGain();
gain.gain.value = -1;
osc1.connect(gain);
osc2.connect(gain);
var biquadWithGain = context.createBiquadFilter();
gain.connect(biquadWithGain);
// The output of biquadWithGain should be the inverse of the sum of the
// outputs of biquad1 and biquad2, so blend them together and expect
// silence.
var blend = context.createGain();
biquad1.connect(blend);
biquad2.connect(blend);
biquadWithGain.connect(blend);
return blend;
},
};
runTest();
</script>
</pre>
</body>
</html>
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