test_audioParamSetCurveAtTime.html (1349B)
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <title>Test AudioParam.linearRampToValue</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 T0 = 0; 14 15 var gTest = { 16 length: 2048, 17 numberOfChannels: 1, 18 createGraph(context) { 19 var source = context.createConstantSource(); 20 21 var gain = context.createGain(); 22 gain.gain.setValueCurveAtTime(this.curve, T0, this.duration); 23 source.connect(gain); 24 25 source.start(0); 26 return gain; 27 }, 28 createExpectedBuffers(context) { 29 this.duration = 1024 / context.sampleRate; 30 this.curve = new Float32Array([1.0, 0.5, 0.75, 0.25]); 31 var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate); 32 var data = expectedBuffer.getChannelData(0); 33 var step = 1024 / 3; 34 for (var i = 0; i < 2048; ++i) { 35 if (i < step) { 36 data[i] = 1.0 - 0.5*i/step; 37 } else if (i < 2*step) { 38 data[i] = 0.5 + 0.25*(i - step)/step; 39 } else if (i < 3*step) { 40 data[i] = 0.75 - 0.5*(i - 2*step)/step; 41 } else { 42 data[i] = 0.25; 43 } 44 } 45 return expectedBuffer; 46 }, 47 }; 48 49 runTest(); 50 51 </script> 52 </pre> 53 </body> 54 </html>