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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test the offset property on AudioBufferSourceNode</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="webaudio.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+var fuzz = 0.3;
+
+if (navigator.platform.startsWith("Mac")) {
+ // bug 895720
+ fuzz = 0.6;
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+ var samplesFromSource = 0;
+ var context = new AudioContext();
+ var sp = context.createScriptProcessor(256);
+
+ sp.onaudioprocess = function(e) {
+ samplesFromSource += e.inputBuffer.length;
+ }
+
+ var buffer = context.createBuffer(1, context.sampleRate, context.sampleRate);
+ for (var i = 0; i < context.sampleRate; ++i) {
+ buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
+ }
+
+ var source = context.createBufferSource();
+
+ source.onended = function(e) {
+ // The timing at which the audioprocess and ended listeners are called can
+ // change, hence the fuzzy equal here.
+ var errorRatio = samplesFromSource / (0.5 * context.sampleRate);
+ ok(errorRatio > (1.0 - fuzz) && errorRatio < (1.0 + fuzz),
+ "Correct number of samples received (expected: " +
+ (0.5 * context.sampleRate) + ", actual: " + samplesFromSource + ").");
+ SimpleTest.finish();
+ };
+
+ source.buffer = buffer;
+ source.connect(sp);
+ source.start(0, 0.5);
+});
+
+</script>
+</pre>
+</body>
+</html>