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<!DOCTYPE HTML>
<html>
<head>
<title>Test the offset property on AudioBufferSourceNode</title>
<script 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() {
// 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>
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