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62 lines
1.7 KiB
HTML
62 lines
1.7 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test BiquadFilterNode after a GainNode and tail - Bugs 924286 and 924288</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<pre id="test">
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<script src="webaudio.js" type="text/javascript"></script>
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<script class="testbody" type="text/javascript">
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const signalLength = 2048;
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var gTest = {
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length: signalLength,
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numberOfChannels: 1,
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createGraph: function(context) {
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// Two oscillators scheduled sequentially
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var signalDuration = signalLength / context.sampleRate;
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var osc1 = context.createOscillator();
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osc1.type = "square";
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osc1.start(0);
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osc1.stop(signalDuration / 2);
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var osc2 = context.createOscillator();
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osc2.start(signalDuration / 2);
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osc2.stop(signalDuration);
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// Comparing a biquad on each source with one on both sources checks that
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// the biquad on the first source doesn't shut down early.
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var biquad1 = context.createBiquadFilter();
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osc1.connect(biquad1);
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var biquad2 = context.createBiquadFilter();
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osc2.connect(biquad2);
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var gain = context.createGain();
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gain.gain.value = -1;
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osc1.connect(gain);
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osc2.connect(gain);
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var biquadWithGain = context.createBiquadFilter();
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gain.connect(biquadWithGain);
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// The output of biquadWithGain should be the inverse of the sum of the
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// outputs of biquad1 and biquad2, so blend them together and expect
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// silence.
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var blend = context.createGain();
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biquad1.connect(blend);
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biquad2.connect(blend);
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biquadWithGain.connect(blend);
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return blend;
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},
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};
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runTest();
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</script>
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</pre>
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</body>
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</html>
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