1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_audioBufferSourceNodeOffset.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,55 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test the offset property on AudioBufferSourceNode</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 +var fuzz = 0.3;
1.17 +
1.18 +if (navigator.platform.startsWith("Mac")) {
1.19 + // bug 895720
1.20 + fuzz = 0.6;
1.21 +}
1.22 +
1.23 +SimpleTest.waitForExplicitFinish();
1.24 +addLoadEvent(function() {
1.25 + var samplesFromSource = 0;
1.26 + var context = new AudioContext();
1.27 + var sp = context.createScriptProcessor(256);
1.28 +
1.29 + sp.onaudioprocess = function(e) {
1.30 + samplesFromSource += e.inputBuffer.length;
1.31 + }
1.32 +
1.33 + var buffer = context.createBuffer(1, context.sampleRate, context.sampleRate);
1.34 + for (var i = 0; i < context.sampleRate; ++i) {
1.35 + buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
1.36 + }
1.37 +
1.38 + var source = context.createBufferSource();
1.39 +
1.40 + source.onended = function(e) {
1.41 + // The timing at which the audioprocess and ended listeners are called can
1.42 + // change, hence the fuzzy equal here.
1.43 + var errorRatio = samplesFromSource / (0.5 * context.sampleRate);
1.44 + ok(errorRatio > (1.0 - fuzz) && errorRatio < (1.0 + fuzz),
1.45 + "Correct number of samples received (expected: " +
1.46 + (0.5 * context.sampleRate) + ", actual: " + samplesFromSource + ").");
1.47 + SimpleTest.finish();
1.48 + };
1.49 +
1.50 + source.buffer = buffer;
1.51 + source.connect(sp);
1.52 + source.start(0, 0.5);
1.53 +});
1.54 +
1.55 +</script>
1.56 +</pre>
1.57 +</body>
1.58 +</html>
