1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_scriptProcessorNodeChannelCount.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,80 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test AudioBufferSourceNode</title>
1.8 + <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.9 + <script type="text/javascript" src="webaudio.js"></script>
1.10 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
1.11 +</head>
1.12 +<body>
1.13 +<pre id="test">
1.14 +<script class="testbody" type="text/javascript">
1.15 +
1.16 +// We do not use our generic graph test framework here because
1.17 +// the testing logic here is sort of complicated, and would
1.18 +// not be easy to map to OfflineAudioContext, as ScriptProcessorNodes
1.19 +// can experience delays.
1.20 +
1.21 +SimpleTest.waitForExplicitFinish();
1.22 +addLoadEvent(function() {
1.23 + var context = new AudioContext();
1.24 + var buffer = context.createBuffer(6, 2048, context.sampleRate);
1.25 + for (var i = 0; i < 2048; ++i) {
1.26 + for (var j = 0; j < 6; ++j) {
1.27 + buffer.getChannelData(0)[i] = Math.sin(440 * j * Math.PI * i / context.sampleRate);
1.28 + }
1.29 + }
1.30 +
1.31 + var monoBuffer = context.createBuffer(1, 2048, context.sampleRate);
1.32 + for (var i = 0; i < 2048; ++i) {
1.33 + monoBuffer.getChannelData(0)[i] = 1;
1.34 + }
1.35 +
1.36 + var source = context.createBufferSource();
1.37 +
1.38 + var sp = context.createScriptProcessor(2048, 3);
1.39 + expectException(function() { sp.channelCount = 2; },
1.40 + DOMException.NOT_SUPPORTED_ERR);
1.41 + sp.channelCountMode = "explicit";
1.42 + expectException(function() { sp.channelCountMode = "max"; },
1.43 + DOMException.NOT_SUPPORTED_ERR);
1.44 + expectException(function() { sp.channelCountMode = "clamped-max"; },
1.45 + DOMException.NOT_SUPPORTED_ERR);
1.46 + sp.channelInterpretation = "discrete";
1.47 + source.start(0);
1.48 + source.buffer = buffer;
1.49 + source.connect(sp);
1.50 + sp.connect(context.destination);
1.51 +
1.52 + var monoSource = context.createBufferSource();
1.53 + monoSource.buffer = monoBuffer;
1.54 + monoSource.connect(sp);
1.55 + monoSource.start(2048 / context.sampleRate);
1.56 +
1.57 + sp.onaudioprocess = function(e) {
1.58 + is(e.inputBuffer.numberOfChannels, 3, "Should be correctly down-mixed to three channels");
1.59 + for (var i = 0; i < 3; ++i) {
1.60 + compareChannels(e.inputBuffer.getChannelData(i), buffer.getChannelData(i));
1.61 + }
1.62 +
1.63 + // On the next iteration, we'll get a silence buffer
1.64 + sp.onaudioprocess = function(e) {
1.65 + var emptyBuffer = context.createBuffer(1, 2048, context.sampleRate);
1.66 + is(e.inputBuffer.numberOfChannels, 3, "Should be correctly up-mixed to three channels");
1.67 + compareChannels(e.inputBuffer.getChannelData(0), monoBuffer.getChannelData(0));
1.68 + for (var i = 1; i < 3; ++i) {
1.69 + compareChannels(e.inputBuffer.getChannelData(i), emptyBuffer.getChannelData(0));
1.70 + }
1.71 +
1.72 + sp.onaudioprocess = null;
1.73 + sp.disconnect(context.destination);
1.74 +
1.75 + SimpleTest.finish();
1.76 + };
1.77 + };
1.78 +});
1.79 +
1.80 +</script>
1.81 +</pre>
1.82 +</body>
1.83 +</html>
