Created
April 20, 2015 04:27
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Video pipeline with Worker
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| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <title></title> | |
| </head> | |
| <body> | |
| <video id="video" width="480" height="360"></video> | |
| <canvas id="canvas1" width="480" height="360"></canvas> | |
| <canvas id="canvas2" width="480" height="360"></canvas> | |
| <canvas id="canvas3" width="480" height="360"></canvas> | |
| <script type="application/javascript;version=1.8"> | |
| for (let element of document.querySelectorAll("[id]")) { | |
| window[element.id] = element; | |
| } | |
| let {width, height} = canvas1; | |
| let context1 = canvas1.getContext("2d"); | |
| let context2 = canvas2.getContext("2d"); | |
| let context3 = canvas3.getContext("2d"); | |
| let worker1 = new Worker("worker1.js"); | |
| worker1.onmessage = function({data}) { | |
| context2.putImageData(new ImageData(new Uint8ClampedArray(data), width, height), 0, 0); | |
| worker2.postMessage(data, [data]); | |
| }; | |
| let worker2 = new Worker("worker2.js"); | |
| worker2.onmessage = function({data}) { | |
| context3.putImageData(new ImageData(new Uint8ClampedArray(data), width, height), 0, 0); | |
| }; | |
| navigator.mozGetUserMedia({video: true}, (stream) => { | |
| video.mozSrcObject = stream; | |
| video.play(); | |
| video.onplaying = function() { | |
| let count = 0; | |
| let interval = setInterval(function() { | |
| context1.drawImage(video, 0, 0, width, height); | |
| let frame = context1.getImageData(0, 0, width, height); | |
| let data = frame.data.buffer; | |
| worker1.postMessage(data, [data]); | |
| if (++count == 500) { | |
| clearInterval(interval); | |
| video.pause(); | |
| stream.stop(); | |
| } | |
| }, 40); | |
| }; | |
| }, console.error.bind(console)); | |
| </script> | |
| </body> | |
| </html> |
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| onmessage = function({data}) { | |
| var u8 = new Uint8ClampedArray(data); | |
| for (var i = 0; i < u8.length;) { | |
| var r = i++; | |
| var g = i++; | |
| var b = i++; | |
| var a = i++; | |
| var average = (u8[r] + u8[g] + u8[b]) / 3; | |
| u8[r] = average; | |
| u8[g] = average; | |
| u8[b] = average; | |
| } | |
| postMessage(data, [data]); | |
| }; |
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| onmessage = function({data}) { | |
| var u8 = new Uint8ClampedArray(data); | |
| for (var i = 0; i < u8.length;) { | |
| var r = i++; | |
| var g = i++; | |
| var b = i++; | |
| var a = i++; | |
| u8[r] *= 1.2; | |
| u8[g] *= 1.2; | |
| u8[b] *= 0.8; | |
| } | |
| postMessage(data, [data]); | |
| }; |
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