test_gainNodeInLoop.html (1267B)
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <title>Test GainNode in presence of loops</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: 4096, 15 numberOfChannels: 1, 16 createGraph(context) { 17 var sourceBuffer = context.createBuffer(1, 2048, context.sampleRate); 18 for (var i = 0; i < 2048; ++i) { 19 sourceBuffer.getChannelData(0)[i] = 1; 20 } 21 22 var source = context.createBufferSource(); 23 source.buffer = sourceBuffer; 24 source.loop = true; 25 source.start(0); 26 source.stop(sourceBuffer.duration * 2); 27 28 var gain = context.createGain(); 29 // Adjust the gain in a way that we don't just end up modifying AudioChunk::mVolume 30 gain.gain.setValueAtTime(0.5, 0); 31 source.connect(gain); 32 return gain; 33 }, 34 createExpectedBuffers(context) { 35 var expectedBuffer = context.createBuffer(1, 4096, context.sampleRate); 36 for (var i = 0; i < 4096; ++i) { 37 expectedBuffer.getChannelData(0)[i] = 0.5; 38 } 39 return expectedBuffer; 40 }, 41 }; 42 43 runTest(); 44 45 </script> 46 </pre> 47 </body> 48 </html>