1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_bug964376.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,64 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test repeating audio is not distorted</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 +
1.16 +function gcd(a, b) {
1.17 + if (b === 0) {
1.18 + return a;
1.19 + }
1.20 + return gcd(b, a % b);
1.21 +}
1.22 +
1.23 +var SAMPLE_PLACEMENT = 128;
1.24 +
1.25 +var gTest = {
1.26 + length: 2048,
1.27 + numberOfChannels: 1,
1.28 +
1.29 + createGraph: function(context) {
1.30 + var freq = Math.round(context.sampleRate / SAMPLE_PLACEMENT);
1.31 + var dur = context.sampleRate / gcd(freq, context.sampleRate);
1.32 + var buffer = context.createBuffer(1, dur, context.sampleRate);
1.33 +
1.34 + for (var i = 0; i < context.sampleRate; ++i) {
1.35 + buffer.getChannelData(0)[i] = Math.sin(freq * 2 * Math.PI * i / context.sampleRate);
1.36 + }
1.37 +
1.38 + var source = context.createBufferSource();
1.39 + source.buffer = buffer;
1.40 + source.loop = true;
1.41 + source.playbackRate.setValueAtTime(0.5, SAMPLE_PLACEMENT / context.sampleRate);
1.42 + source.start(0);
1.43 +
1.44 + return source;
1.45 + },
1.46 +
1.47 + createExpectedBuffers: function(context) {
1.48 + var freq = Math.round(context.sampleRate / SAMPLE_PLACEMENT);
1.49 + var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
1.50 + var c = expectedBuffer.getChannelData(0);
1.51 + for (var i = 0; i < c.length; ++i) {
1.52 + if (i < SAMPLE_PLACEMENT) {
1.53 + c[i] = Math.sin(freq * 2 * Math.PI * i / context.sampleRate);
1.54 + } else {
1.55 + c[i] = Math.sin(freq / 2 * 2 * Math.PI * (i + SAMPLE_PLACEMENT) / context.sampleRate);
1.56 + }
1.57 + }
1.58 +
1.59 + return expectedBuffer;
1.60 + },
1.61 +};
1.62 +
1.63 +runTest();
1.64 +</script>
1.65 +</pre>
1.66 +</body>
1.67 +</html>
