test_waveShaper.html (1730B)
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <title>Test WaveShaperNode with no curve</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 source = context.createBufferSource(); 18 source.buffer = this.buffer; 19 20 var shaper = new WaveShaperNode(context); 21 shaper.curve = this.curve; 22 23 source.connect(shaper); 24 25 source.start(0); 26 return shaper; 27 }, 28 createExpectedBuffers(context) { 29 this.buffer = context.createBuffer(1, 4096, context.sampleRate); 30 for (var i = 1; i < 4095; ++i) { 31 this.buffer.getChannelData(0)[i] = 2 * (i / 4096) - 1; 32 } 33 // Two out of range values 34 this.buffer.getChannelData(0)[0] = -2; 35 this.buffer.getChannelData(0)[4095] = 2; 36 37 this.curve = new Float32Array(2048); 38 for (var i = 0; i < 2048; ++i) { 39 this.curve[i] = Math.sin(100 * Math.PI * (i + 1) / context.sampleRate); 40 } 41 42 var expectedBuffer = context.createBuffer(1, 4096, context.sampleRate); 43 for (var i = 1; i < 4095; ++i) { 44 var input = this.buffer.getChannelData(0)[i]; 45 var index = Math.floor(this.curve.length * (input + 1) / 2); 46 index = Math.max(0, Math.min(this.curve.length - 1, index)); 47 expectedBuffer.getChannelData(0)[i] = this.curve[index]; 48 } 49 expectedBuffer.getChannelData(0)[0] = this.curve[0]; 50 expectedBuffer.getChannelData(0)[4095] = this.curve[2047]; 51 return expectedBuffer; 52 }, 53 }; 54 55 runTest(); 56 57 </script> 58 </pre> 59 </body> 60 </html>