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August 29, 2015 14:12
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testing test pattern
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| <!doctype html> | |
| <html> | |
| <meta charset="utf-8"> | |
| <title>test pattern</title> | |
| <style> | |
| * { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| body { | |
| overflow: hidden; | |
| } | |
| </style> | |
| <body> | |
| <canvas width="1024" height="1024"></canvas><script> | |
| var buf = 1024; | |
| var au = new Audio(); | |
| au.autoplay = true; | |
| au.loop = true; | |
| // au.src = 'sensuous.m4a'; | |
| au.src = 'ri.m4a'; | |
| var context = new AudioContext(); | |
| var source = context.createMediaElementSource(au); | |
| var processor = context.createScriptProcessor(buf, 2, 2); | |
| var canvas = document.querySelector('canvas'); | |
| var ctx = canvas.getContext('2d'); | |
| canvas.height = buf; | |
| var lc = []; | |
| var rc = []; | |
| processor.onaudioprocess = function(e) { | |
| var il = lc = e.inputBuffer.getChannelData(0); | |
| var ir = rc = e.inputBuffer.getChannelData(1); | |
| var ol = e.outputBuffer.getChannelData(0); | |
| var or = e.outputBuffer.getChannelData(1); | |
| for (var i = 0, l = processor.bufferSize; i < l; ++i) { | |
| ol[i] = il[i]; | |
| or[i] = ir[i]; | |
| } | |
| }; | |
| requestAnimationFrame(function() { | |
| ctx.clearRect(0, 0, canvas.width, canvas.height); | |
| for (var i = 0, l = canvas.height; i < l; ++i) { | |
| ctx.beginPath(); | |
| ctx.moveTo(0, i); | |
| if (lc[i] < 0) { | |
| ctx.strokeStyle = 'white'; | |
| } else { | |
| ctx.strokeStyle = 'black'; | |
| } | |
| ctx.lineTo(canvas.width / 2, i); | |
| ctx.closePath(); | |
| ctx.stroke(); | |
| ctx.beginPath(); | |
| ctx.moveTo(canvas.width / 2, canvas.height - i); | |
| if (rc[i] < 0) { | |
| ctx.strokeStyle = 'white'; | |
| } else { | |
| ctx.strokeStyle = 'black'; | |
| } | |
| ctx.lineTo(canvas.width, canvas.height - i); | |
| ctx.closePath(); | |
| ctx.stroke(); | |
| } | |
| requestAnimationFrame(arguments.callee); | |
| }); | |
| source.connect(processor); | |
| processor.connect(context.destination); | |
| function fit() { | |
| canvas.width = window.innerWidth; | |
| canvas.height = window.innerHeight; | |
| } | |
| window.onresize = fit; | |
| fit(); | |
| window.onclick = function(e) { | |
| au.paused ? au.play() : au.pause(); | |
| e.preventDefault(); | |
| }; | |
| </script></body> | |
| </html> |
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