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186 lines
3.8 KiB
186 lines
3.8 KiB
// QRCODE reader Copyright 2011 Lazar Laszlo
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// http://www.webqr.com
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var gCtx = null;
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var gCanvas = null;
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var c=0;
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var stype=0;
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var gUM=false;
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var webkit=false;
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var moz=false;
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var v=null;
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var qrSize = 0;
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var margin = 0;
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var scannedCallback = null;
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var vidhtml = '<video id="video-stream" autoplay></video>';
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function handleFiles(f)
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{
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var o=[];
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for(var i =0;i<f.length;i++)
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{
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var reader = new FileReader();
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reader.onload = (function(theFile) {
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return function(e) {
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gCtx.clearRect(0, 0, gCanvas.width, gCanvas.height);
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qrcode.decode(e.target.result);
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};
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})(f[i]);
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reader.readAsDataURL(f[i]);
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}
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}
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function initCanvas(w,h)
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{
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gCanvas = document.getElementById("qr-canvas");
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gCanvas.style.width = w + "px";
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gCanvas.style.height = h + "px";
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gCanvas.width = w;
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gCanvas.height = h;
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gCtx = gCanvas.getContext("2d");
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gCtx.clearRect(0, 0, w, h);
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}
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function captureToCanvas() {
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if(stype!=1)
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return;
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if(gUM)
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{
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try{
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gCtx.drawImage(v,0,0);
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try{
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qrcode.decode();
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}
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catch(e){
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console.log(e);
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setTimeout(captureToCanvas, 500);
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};
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}
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catch(e){
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console.log(e);
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setTimeout(captureToCanvas, 500);
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};
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}
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}
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function htmlEntities(str) {
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return String(str).replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"');
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}
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function read(a)
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{
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if (scannedCallback) scannedCallback(a);
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}
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function isCanvasSupported(){
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var elem = document.createElement('canvas');
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return !!(elem.getContext && elem.getContext('2d'));
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}
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function success(stream)
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{
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v.srcObject = stream;
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v.play();
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gUM=true;
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setTimeout(captureToCanvas, 500);
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}
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function error(error) {
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gUM=false;
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return;
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}
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function load(initSize, initMargin, callback)
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{
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qrSize = initSize;
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margin = initMargin;
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scannedCallback = callback;
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if(isCanvasSupported() && window.File && window.FileReader)
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{
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initCanvas(800, 600);
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qrcode.callback = read;
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setwebcam();
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}
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else
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{
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console.log("Sorry your browser is not supported");
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}
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}
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function setwebcam()
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{
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var options = true;
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if(navigator.mediaDevices && navigator.mediaDevices.enumerateDevices)
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{
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try{
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navigator.mediaDevices.enumerateDevices()
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.then(function(devices) {
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devices.forEach(function(device) {
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if (device.kind === 'videoinput') {
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if(device.label.toLowerCase().search("back") >-1)
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options={'deviceId': {'exact':device.deviceId}, 'facingMode':'environment'} ;
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}
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console.log(device.kind + ": " + device.label +" id = " + device.deviceId);
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});
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setwebcam2(options);
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});
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}
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catch(e)
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{
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console.log(e);
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}
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}
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else{
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console.log("no navigator.mediaDevices.enumerateDevices" );
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setwebcam2(options);
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}
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}
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function setwebcam2(options)
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{
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console.log(options);
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if(stype==1)
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{
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setTimeout(captureToCanvas, 500);
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return;
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}
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var n=navigator;
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document.getElementById("outdiv").innerHTML = vidhtml;
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v=document.getElementById("video-stream");
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v.style.width = qrSize + "px";
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v.style.marginLeft = margin + "px";
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if(n.mediaDevices.getUserMedia)
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{
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n.mediaDevices.getUserMedia({video: options, audio: false}).
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then(function(stream){
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success(stream);
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}).catch(function(error){
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error(error)
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});
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}
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else
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if(n.getUserMedia)
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{
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webkit=true;
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n.getUserMedia({video: options, audio: false}, success, error);
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}
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else
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if(n.webkitGetUserMedia)
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{
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webkit=true;
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n.webkitGetUserMedia({video:options, audio: false}, success, error);
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}
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stype=1;
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setTimeout(captureToCanvas, 500);
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}
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