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content/media/webaudio/test/test_channelSplitterNode.html
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| -1:000000000000 | 0:895c7f315e9f |
|---|---|
| 1 <!DOCTYPE HTML> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test ChannelSplitterNode</title> | |
| 5 <script type="text/javascript" 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 = context.createChannelSplitter(); | |
| 33 is(splitter.channelCount, 2, "splitter node has 2 input channels by default"); | |
| 34 is(splitter.channelCountMode, "max", "Correct channelCountMode for the splitter node"); | |
| 35 is(splitter.channelInterpretation, "speakers", "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> |
