<!DOCTYPE HTML> <html> <head> <title>Test ChannelSplitterNode</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 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, 2, "splitter node has 2 input channels by default"); is(splitter.channelCountMode, "max", "Correct channelCountMode for the splitter node"); is(splitter.channelInterpretation, "speakers", "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>