<!DOCTYPE HTML>
<html>
<head>
<title>Test 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">
// We do not use our generic graph test framework here because
// the testing logic here is sort of complicated, and would
// not be easy to map to OfflineAudioContext, as ScriptProcessorNodes
// can experience delays.
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
var context = new AudioContext();
var buffer = context.createBuffer(6, 2048, context.sampleRate);
for (var i = 0; i < 2048; ++i) {
for (var j = 0; j < 6; ++j) {
buffer.getChannelData(0)[i] = Math.sin(440 * j * Math.PI * i / context.sampleRate);
}
}
var monoBuffer = context.createBuffer(1, 2048, context.sampleRate);
for (var i = 0; i < 2048; ++i) {
monoBuffer.getChannelData(0)[i] = 1;
}
var source = context.createBufferSource();
var sp = context.createScriptProcessor(2048, 3);
expectException(function() { sp.channelCount = 2; },
DOMException.NOT_SUPPORTED_ERR);
sp.channelCountMode = "explicit";
expectException(function() { sp.channelCountMode = "max"; },
DOMException.NOT_SUPPORTED_ERR);
expectException(function() { sp.channelCountMode = "clamped-max"; },
DOMException.NOT_SUPPORTED_ERR);
sp.channelInterpretation = "discrete";
source.start(0);
source.buffer = buffer;
source.connect(sp);
sp.connect(context.destination);
var monoSource = context.createBufferSource();
monoSource.buffer = monoBuffer;
monoSource.connect(sp);
monoSource.start(2048 / context.sampleRate);
sp.onaudioprocess = function(e) {
is(e.inputBuffer.numberOfChannels, 3, "Should be correctly down-mixed to three channels");
for (var i = 0; i < 3; ++i) {
compareChannels(e.inputBuffer.getChannelData(i), buffer.getChannelData(i));
}
// On the next iteration, we'll get a silence buffer
sp.onaudioprocess = function(e) {
var emptyBuffer = context.createBuffer(1, 2048, context.sampleRate);
is(e.inputBuffer.numberOfChannels, 3, "Should be correctly up-mixed to three channels");
compareChannels(e.inputBuffer.getChannelData(0), monoBuffer.getChannelData(0));
for (var i = 1; i < 3; ++i) {
compareChannels(e.inputBuffer.getChannelData(i), emptyBuffer.getChannelData(0));
}
sp.onaudioprocess = null;
sp.disconnect(context.destination);
SimpleTest.finish();
};
};
});
</script>
</pre>
</body>
</html>