1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_bug972678.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 buffers do not interfere when scheduled in sequence</title>
1.8 + <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.9 + <script type="text/javascript" src="webaudio.js"></script>
1.10 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
1.11 +</head>
1.12 +<body>
1.13 +<pre id="test">
1.14 +<script class="testbody" type="text/javascript">
1.15 +var OFFSETS = [0.005, 0.01, 0.02, 0.03];
1.16 +var LENGTH = 128;
1.17 +
1.18 +var gTest = {
1.19 + length: 128 * OFFSETS.length,
1.20 + numberOfChannels: 1,
1.21 +
1.22 + createGraph: function(context) {
1.23 + var gain = context.createGain();
1.24 +
1.25 + // create a repeating sample
1.26 + var repeatingSample = context.createBuffer(1, 2, context.sampleRate);
1.27 + var c = repeatingSample.getChannelData(0);
1.28 + for (var i = 0; i < repeatingSample.length; ++i) {
1.29 + c[i] = i % 2 == 0 ? 1 : -1;
1.30 + }
1.31 +
1.32 + OFFSETS.forEach(function (offset, offsetIdx) {
1.33 + // Schedule a set of nodes to repeat the sample.
1.34 + for (var i = 0; i < LENGTH; i += repeatingSample.length) {
1.35 + var source = context.createBufferSource();
1.36 + source.buffer = repeatingSample;
1.37 + source.connect(gain);
1.38 + source.start((offsetIdx * LENGTH + i + offset) / context.sampleRate);
1.39 + }
1.40 +
1.41 + buffer = context.createBuffer(1, LENGTH, context.sampleRate);
1.42 + c = buffer.getChannelData(0);
1.43 + for (var i = 0; i < buffer.length; ++i) {
1.44 + c[i] = i % 2 == 0 ? -1 : 1;
1.45 + }
1.46 +
1.47 + var source = context.createBufferSource();
1.48 + source.buffer = buffer;
1.49 + source.connect(gain);
1.50 + source.start((offsetIdx * LENGTH + offset) / context.sampleRate);
1.51 + });
1.52 +
1.53 + return gain;
1.54 + },
1.55 +
1.56 + createExpectedBuffers: function(context) {
1.57 + return context.createBuffer(1, gTest.length, context.sampleRate);
1.58 + },
1.59 +};
1.60 +
1.61 +runTest();
1.62 +</script>
1.63 +</pre>
1.64 +</body>
1.65 +</html>
