test_audioParamSetTargetAtTime.html (1301B)
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <title>Test AudioParam.setTargetAtTime</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 V0 = 0.9; 14 var V1 = 0.1; 15 var T0 = 0; 16 var TimeConstant = 10; 17 18 var gTest = { 19 length: 2048, 20 numberOfChannels: 1, 21 createGraph(context) { 22 var sourceBuffer = context.createBuffer(1, 2048, context.sampleRate); 23 for (var i = 0; i < 2048; ++i) { 24 sourceBuffer.getChannelData(0)[i] = 1; 25 } 26 27 var source = context.createBufferSource(); 28 source.buffer = sourceBuffer; 29 30 var gain = context.createGain(); 31 gain.gain.value = V0; 32 gain.gain.setTargetAtTime(V1, T0, TimeConstant); 33 34 source.connect(gain); 35 36 source.start(0); 37 return gain; 38 }, 39 createExpectedBuffers(context) { 40 var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate); 41 for (var i = 0; i < 2048; ++i) { 42 var t = i / context.sampleRate; 43 expectedBuffer.getChannelData(0)[i] = V1 + (V0 - V1) * Math.exp(-(t - T0) / TimeConstant); 44 } 45 return expectedBuffer; 46 }, 47 }; 48 49 runTest(); 50 51 </script> 52 </pre> 53 </body> 54 </html>