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Test Info:
<!DOCTYPE HTML>
<html>
<head>
<title>Test AudioBufferSourceNode looping</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 gTest = {
length: 2048 * 4,
numberOfChannels: 1,
createGraph(context) {
var buffer = context.createBuffer(1, 2048, context.sampleRate);
for (var i = 0; i < 2048; ++i) {
buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
}
var source = new AudioBufferSourceNode(context, {buffer, loop: true, loopStart: buffer.duration * 0.25, loopEnd: buffer.duration * 0.75 });
source.start(0);
return source;
},
createExpectedBuffers(context) {
var expectedBuffer = context.createBuffer(1, 2048 * 4, context.sampleRate);
for (var i = 0; i < 1536; ++i) {
expectedBuffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
}
for (var i = 0; i < 6; ++i) {
for (var j = 512; j < 1536; ++j) {
expectedBuffer.getChannelData(0)[1536 + i * 1024 + j - 512] = Math.sin(440 * 2 * Math.PI * j / context.sampleRate);
}
}
for (var j = 7680; j < 2048 * 4; ++j) {
expectedBuffer.getChannelData(0)[j] = Math.sin(440 * 2 * Math.PI * (j - 7168) / context.sampleRate);
}
return expectedBuffer;
},
};
runTest();
</script>
</pre>
</body>
</html>