1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_convolverNodeWithGain.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,62 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test ConvolverNode after a GainNode - Bug 891254 </title>
1.8 + <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.9 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
1.10 +</head>
1.11 +<body>
1.12 +<pre id="test">
1.13 +<script src="webaudio.js" type="text/javascript"></script>
1.14 +<script class="testbody" type="text/javascript">
1.15 +
1.16 +const signalLength = 2048;
1.17 +const responseLength = 100;
1.18 +const outputLength = 4096; // > signalLength + responseLength
1.19 +
1.20 +var gTest = {
1.21 + length: outputLength,
1.22 + numberOfChannels: 1,
1.23 + createGraph: function(context) {
1.24 + var buffer = context.createBuffer(1, signalLength, context.sampleRate);
1.25 + for (var i = 0; i < signalLength; ++i) {
1.26 + buffer.getChannelData(0)[i] = Math.sin(2 * Math.PI * i / signalLength);
1.27 + }
1.28 +
1.29 + var source = context.createBufferSource();
1.30 + source.buffer = buffer;
1.31 + source.start(0);
1.32 +
1.33 + var response = context.createBuffer(1, responseLength, context.sampleRate);
1.34 + for (var i = 0; i < responseLength; ++i) {
1.35 + response.getChannelData(0)[i] = i / responseLength;
1.36 + }
1.37 +
1.38 + var gain = context.createGain();
1.39 + gain.gain.value = -1;
1.40 + source.connect(gain);
1.41 +
1.42 + var convolver1 = context.createConvolver();
1.43 + convolver1.buffer = response;
1.44 + gain.connect(convolver1);
1.45 +
1.46 + var convolver2 = context.createConvolver();
1.47 + convolver2.buffer = response;
1.48 + source.connect(convolver2);
1.49 +
1.50 + // The output of convolver1 should be the inverse of convolver2, so blend
1.51 + // them together and expect silence.
1.52 + var blend = context.createGain();
1.53 + convolver1.connect(blend);
1.54 + convolver2.connect(blend);
1.55 +
1.56 + return blend;
1.57 + },
1.58 +};
1.59 +
1.60 +runTest();
1.61 +
1.62 +</script>
1.63 +</pre>
1.64 +</body>
1.65 +</html>
