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