test_channelMergerNodeWithVolume.html (1792B)
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <title>Test ChannelMergerNode</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 var gTest = { 14 length: 2048, 15 numberOfChannels: 6, 16 createGraph(context) { 17 var buffers = []; 18 for (var j = 0; j < 6; ++j) { 19 var buffer = context.createBuffer(2, 2048, context.sampleRate); 20 for (var i = 0; i < 2048; ++i) { 21 buffer.getChannelData(0)[i] = Math.sin(440 * 2 * (j + 1) * Math.PI * i / context.sampleRate); 22 // Second channel is silent 23 } 24 buffers.push(buffer); 25 } 26 27 var merger = context.createChannelMerger(); 28 is(merger.channelCount, 1, "merger node has 1 input channels"); 29 is(merger.channelCountMode, "explicit", "Correct channelCountMode for the merger node"); 30 is(merger.channelInterpretation, "speakers", "Correct channelCountInterpretation for the merger node"); 31 32 for (var i = 0; i < 6; ++i) { 33 var source = context.createBufferSource(); 34 source.buffer = buffers[i]; 35 var gain = context.createGain(); 36 gain.gain.value = 0.5; 37 source.connect(gain); 38 gain.connect(merger, 0, i); 39 source.start(0); 40 } 41 42 return merger; 43 }, 44 createExpectedBuffers(context) { 45 var expectedBuffer = context.createBuffer(6, 2048, context.sampleRate); 46 for (var i = 0; i < 6; ++i) { 47 for (var j = 0; j < 2048; ++j) { 48 expectedBuffer.getChannelData(i)[j] = 0.5 * 0.5 * Math.sin(440 * 2 * (i + 1) * Math.PI * j / context.sampleRate); 49 } 50 } 51 return expectedBuffer; 52 }, 53 }; 54 55 runTest(); 56 57 </script> 58 </pre> 59 </body> 60 </html>