test_channelSplitterNode.html (2145B)
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <title>Test ChannelSplitterNode</title> 5 <script src="/tests/SimpleTest/SimpleTest.js"></script> 6 <script type="text/javascript" src="webaudio.js"></script> 7 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> 8 </head> 9 <body> 10 <pre id="test"> 11 <script class="testbody" type="text/javascript"> 12 13 // We do not use our generic graph test framework here because 14 // the splitter node is special in that it creates multiple 15 // output ports. 16 17 SimpleTest.waitForExplicitFinish(); 18 addLoadEvent(function() { 19 var context = new AudioContext(); 20 var buffer = context.createBuffer(4, 2048, context.sampleRate); 21 for (var j = 0; j < 4; ++j) { 22 for (var i = 0; i < 2048; ++i) { 23 buffer.getChannelData(j)[i] = Math.sin(440 * 2 * (j + 1) * Math.PI * i / context.sampleRate); 24 } 25 } 26 var emptyBuffer = context.createBuffer(1, 2048, context.sampleRate); 27 28 var destination = context.destination; 29 30 var source = context.createBufferSource(); 31 32 var splitter = new ChannelSplitterNode(context); 33 is(splitter.channelCount, 6, "splitter node has 2 input channels by default"); 34 is(splitter.channelCountMode, "explicit", "Correct channelCountMode for the splitter node"); 35 is(splitter.channelInterpretation, "discrete", "Correct channelCountInterpretation for the splitter node"); 36 37 source.buffer = buffer; 38 source.connect(splitter); 39 40 var channelsSeen = 0; 41 function createHandler(i) { 42 return function(e) { 43 is(e.inputBuffer.numberOfChannels, 1, "Correct input channel count"); 44 if (i < 4) { 45 compareChannels(e.inputBuffer.getChannelData(0), buffer.getChannelData(i)); 46 } else { 47 compareChannels(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0)); 48 } 49 e.target.onaudioprocess = null; 50 ++channelsSeen; 51 52 if (channelsSeen == 6) { 53 SimpleTest.finish(); 54 } 55 }; 56 } 57 58 for (var i = 0; i < 6; ++i) { 59 var sp = context.createScriptProcessor(2048, 1); 60 splitter.connect(sp, i); 61 sp.onaudioprocess = createHandler(i); 62 sp.connect(destination); 63 } 64 65 source.start(0); 66 }); 67 68 </script> 69 </pre> 70 </body> 71 </html>