Created
December 8, 2011 18:42
-
-
Save hagino3000/1447986 to your computer and use it in GitHub Desktop.
WebSocket with binary data
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
var socket = null; | |
function bootstrap() { | |
// 適当な図形を描画 | |
var c = document.getElementById('mycanvas'); | |
var ctx = c.getContext('2d'); | |
ctx.globalalpha = 0.3; | |
for(var i=0; i<1000; i++) { | |
ctx.beginPath(); | |
var r = Math.floor(Math.random() * 256); | |
var g = Math.floor(Math.random() * 256); | |
var b = Math.floor(Math.random() * 256); | |
ctx.strokeStyle = 'rgb(' + r + ',' + g + ',' + b + ')'; | |
ctx.moveTo(Math.random()*200, Math.random()*200); | |
ctx.lineTo(Math.random()*200, Math.random()*200); | |
ctx.stroke(); | |
} | |
// Socketの初期化 | |
socket = new WebSocket('ws://localhost:8082'); | |
socket.binaryType = 'arraybuffer'; | |
socket.onopen = function() { | |
send(ctx); | |
} | |
socket.onmessage = handleReceive; | |
}; | |
function send(ctx) { | |
// RAWデータをそのまま送信 | |
var data = ctx.getImageData(0, 0, 200, 200).data; | |
var byteArray = new Uint8Array(data); | |
socket.send(byteArray.buffer); | |
} | |
function handleReceive(message) { | |
// 受信したRAWデータをcanvasに | |
var c = resultCanvas = document.getElementById('result'); | |
var ctx = c.getContext('2d'); | |
var imageData = ctx.createImageData(200, 200); | |
var pixels = imageData.data; | |
var buffer = new Uint8Array(message.data); | |
for (var i=0; i < pixels.length; i++) { | |
pixels[i] = buffer[i]; | |
} | |
ctx.putImageData(imageData, 0, 0); | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<html> | |
<head> | |
<script src="./client.js"></script> | |
</head> | |
<body onload="bootstrap()"> | |
<div style="width:210px;float:left;"> | |
Input<br> | |
<canvas id="mycanvas" width="200" height="200"></canvas> | |
</div> | |
<div style="float:left;width:210px;"> | |
Result<br> | |
<canvas id="result" width="200" height="200"></canvas> | |
</div> | |
</body> | |
</html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/usr/bin/env node | |
var WebSocketServer = require('websocket').server, | |
http = require('http'), | |
fs = require('fs'); | |
var server = http.createServer(function(request, response) { | |
var filePath; | |
if (request.url == '/') { | |
filePath = './index.html'; | |
} else { | |
filePath = './client.js'; | |
} | |
var data = fs.readFileSync(filePath, 'utf8'); | |
console.log((new Date()) + " Received request for " + request.url); | |
response.end(data); | |
}); | |
server.listen(8082, function() { | |
console.log((new Date()) + " Server is listening on port 8082"); | |
}); | |
wsServer = new WebSocketServer({ | |
httpServer: server, | |
// デフォルトでは65535byte以上受けつけないので | |
// 値を増やしてみる | |
maxReceivedFrameSize: 0x1000000, | |
autoAcceptConnections: false | |
}); | |
wsServer.on('request', function(request) { | |
var connection = request.accept(null, request.origin); | |
console.log((new Date()) + " Connection accepted."); | |
connection.on('message', function(message) { | |
if (message.type === 'utf8') { | |
// NOP | |
} | |
else if (message.type === 'binary') { | |
// バイナリデータを受信した場合 | |
console.log("Received Binary Message of " + message.binaryData.length + " bytes"); | |
console.log(message.binaryData); | |
var data = message.binaryData; | |
var len = data.length; | |
// 受信したRAW画像をグレースケールにする | |
var buf = new Buffer(len); | |
var arr = new Uint32Array(buf); | |
for (var i = 0; i < len; i+=4 ) { | |
var r = data.readUInt8(i); | |
var g = data.readUInt8(i+1); | |
var b = data.readUInt8(i+2); | |
var y = Math.floor((77*r + 28*g + 151*b)/255); | |
// Canvasにそのまま投入するために | |
// 4チャンネル8ビットのRGBAにする | |
var v = y + (y << 8) + (y << 16) + (0xFF << 24); | |
buf.writeInt32LE(v, i); | |
} | |
// グレースケールにした物をクライアントに送信する | |
connection.sendBytes(buf); | |
} | |
}); | |
connection.on('close', function(reasonCode, description) { | |
console.log((new Date()) + " Peer " + connection.remoteAddress + " disconnected."); | |
}); | |
}); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
非常感谢,非常有用