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<!DOCTYPE HTML>
<html>
<head>
<title>Test ChannelSplitterNode</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">
// We do not use our generic graph test framework here because
// the splitter node is special in that it creates multiple
// output ports.
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
var context = new AudioContext();
var buffer = context.createBuffer(4, 2048, context.sampleRate);
var expectedBuffer = context.createBuffer(4, 2048, context.sampleRate);
for (var j = 0; j < 4; ++j) {
for (var i = 0; i < 2048; ++i) {
buffer.getChannelData(j)[i] = Math.sin(440 * 2 * (j + 1) * Math.PI * i / context.sampleRate);
expectedBuffer.getChannelData(j)[i] = buffer.getChannelData(j)[i] / 2;
}
}
var emptyBuffer = context.createBuffer(1, 2048, context.sampleRate);
var destination = context.destination;
var source = context.createBufferSource();
var splitter = context.createChannelSplitter();
is(splitter.channelCount, 6, "splitter node has 2 input channels by default");
is(splitter.channelCountMode, "explicit", "Correct channelCountMode for the splitter node");
is(splitter.channelInterpretation, "discrete", "Correct channelCountInterpretation for the splitter node");
source.buffer = buffer;
var gain = context.createGain();
gain.gain.value = 0.5;
source.connect(gain);
gain.connect(splitter);
var channelsSeen = 0;
function createHandler(i) {
return function(e) {
is(e.inputBuffer.numberOfChannels, 1, "Correct input channel count");
if (i < 4) {
compareBuffers(e.inputBuffer.getChannelData(0), expectedBuffer.getChannelData(i));
} else {
compareBuffers(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0));
}
e.target.onaudioprocess = null;
++channelsSeen;
if (channelsSeen == 6) {
SimpleTest.finish();
}
};
}
for (var i = 0; i < 6; ++i) {
var sp = context.createScriptProcessor(2048, 1);
splitter.connect(sp, i);
sp.onaudioprocess = createHandler(i);
sp.connect(destination);
}
source.start(0);
});
</script>
</pre>
</body>
</html>
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