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// WebcamJS v1.0.25
// Webcam library for capturing JPEG/PNG images in JavaScript
// Attempts getUserMedia, falls back to Flash
// Author: Joseph Huckaby: http://github.com/jhuckaby
// Based on JPEGCam: http://code.google.com/p/jpegcam/
// Copyright (c) 2012 - 2017 Joseph Huckaby
// Licensed under the MIT License
(function(window) {
var _userMedia;
// declare error types
// inheritance pattern here:
// https://stackoverflow.com/questions/783818/how-do-i-create-a-custom-error-in-javascript
function FlashError() {
var temp = Error.apply(this, arguments);
temp.name = this.name = "FlashError";
this.stack = temp.stack;
this.message = temp.message;
}
function WebcamError() {
var temp = Error.apply(this, arguments);
temp.name = this.name = "WebcamError";
this.stack = temp.stack;
this.message = temp.message;
}
var IntermediateInheritor = function() {};
IntermediateInheritor.prototype = Error.prototype;
FlashError.prototype = new IntermediateInheritor();
WebcamError.prototype = new IntermediateInheritor();
var Webcam = {
version: '1.0.25',
// globals
protocol: location.protocol.match(/https/i) ? 'https' : 'http',
loaded: false, // true when webcam movie finishes loading
live: false, // true when webcam is initialized and ready to snap
userMedia: true, // true when getUserMedia is supported natively
iOS: /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream,
params: {
width: 0,
height: 0,
dest_width: 0, // size of captured image
dest_height: 0, // these default to width/height
image_format: 'jpeg', // image format (may be jpeg or png)
jpeg_quality: 90, // jpeg image quality from 0 (worst) to 100 (best)
enable_flash: true, // enable flash fallback,
force_flash: false, // force flash mode,
flip_horiz: false, // flip image horiz (mirror mode)
fps: 30, // camera frames per second
upload_name: 'webcam', // name of file in upload post data
constraints: null, // custom user media constraints,
swfURL: '', // URI to webcam.swf movie (defaults to the js location)
flashNotDetectedText: 'ERROR: No Adobe Flash Player detected. Webcam.js relies on Flash for browsers that do not support getUserMedia (like yours).',
noInterfaceFoundText: 'No supported webcam interface found.',
unfreeze_snap: true, // Whether to unfreeze the camera after snap (defaults to true)
iosPlaceholderText: 'Click here to open camera.',
user_callback: null, // callback function for snapshot (used if no user_callback parameter given to snap function)
user_canvas: null // user provided canvas for snapshot (used if no user_canvas parameter given to snap function)
},
errors: {
FlashError: FlashError,
WebcamError: WebcamError
},
hooks: {}, // callback hook functions
init: function() {
// initialize, check for getUserMedia support
var self = this;
// Setup getUserMedia, with polyfill for older browsers
// Adapted from: https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia
this.mediaDevices = (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) ?
navigator.mediaDevices : ((navigator.mozGetUserMedia || navigator.webkitGetUserMedia) ? {
getUserMedia: function(c) {
return new Promise(function(y, n) {
(navigator.mozGetUserMedia ||
navigator.webkitGetUserMedia).call(navigator, c, y, n);
});
}
} : null);
window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL;
this.userMedia = this.userMedia && !!this.mediaDevices && !!window.URL;
if (this.iOS) {
this.userMedia = null;
}
// Older versions of firefox (< 21) apparently claim support but user media does not actually work
if (navigator.userAgent.match(/Firefox\D+(\d+)/)) {
if (parseInt(RegExp.$1, 10) < 21) this.userMedia = null;
}
// Make sure media stream is closed when navigating away from page
if (this.userMedia) {
window.addEventListener( 'beforeunload', function(event) {
self.reset();
} );
}
},
exifOrientation: function(binFile) {
// extract orientation information from the image provided by iOS
// algorithm based on exif-js
var dataView = new DataView(binFile);
if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
console.log('Not a valid JPEG file');
return 0;
}
var offset = 2;
var marker = null;
while (offset < binFile.byteLength) {
// find 0xFFE1 (225 marker)
if (dataView.getUint8(offset) != 0xFF) {
console.log('Not a valid marker at offset ' + offset + ', found: ' + dataView.getUint8(offset));
return 0;
}
marker = dataView.getUint8(offset + 1);
if (marker == 225) {
offset += 4;
var str = "";
for (n = 0; n < 4; n++) {
str += String.fromCharCode(dataView.getUint8(offset+n));
}
if (str != 'Exif') {
console.log('Not valid EXIF data found');
return 0;
}
offset += 6; // tiffOffset
var bigEnd = null;
// test for TIFF validity and endianness
if (dataView.getUint16(offset) == 0x4949) {
bigEnd = false;
} else if (dataView.getUint16(offset) == 0x4D4D) {
bigEnd = true;
} else {
console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)");
return 0;
}
if (dataView.getUint16(offset+2, !bigEnd) != 0x002A) {
console.log("Not valid TIFF data! (no 0x002A)");
return 0;
}
var firstIFDOffset = dataView.getUint32(offset+4, !bigEnd);
if (firstIFDOffset < 0x00000008) {
console.log("Not valid TIFF data! (First offset less than 8)", dataView.getUint32(offset+4, !bigEnd));
return 0;
}
// extract orientation data
var dataStart = offset + firstIFDOffset;
var entries = dataView.getUint16(dataStart, !bigEnd);
for (var i=0; i 8) {
console.log('Invalid EXIF orientation value ('+value+')');
return 0;
}
return value;
}
}
} else {
offset += 2+dataView.getUint16(offset+2);
}
}
return 0;
},
fixOrientation: function(origObjURL, orientation, targetImg) {
// fix image orientation based on exif orientation data
// exif orientation information
// http://www.impulseadventure.com/photo/exif-orientation.html
// link source wikipedia (https://en.wikipedia.org/wiki/Exif#cite_note-20)
var img = new Image();
img.addEventListener('load', function(event) {
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
// switch width height if orientation needed
if (orientation < 5) {
canvas.width = img.width;
canvas.height = img.height;
} else {
canvas.width = img.height;
canvas.height = img.width;
}
// transform (rotate) image - see link at beginning this method
switch (orientation) {
case 2: ctx.transform(-1, 0, 0, 1, img.width, 0); break;
case 3: ctx.transform(-1, 0, 0, -1, img.width, img.height); break;
case 4: ctx.transform(1, 0, 0, -1, 0, img.height); break;
case 5: ctx.transform(0, 1, 1, 0, 0, 0); break;
case 6: ctx.transform(0, 1, -1, 0, img.height , 0); break;
case 7: ctx.transform(0, -1, -1, 0, img.height, img.width); break;
case 8: ctx.transform(0, -1, 1, 0, 0, img.width); break;
}
ctx.drawImage(img, 0, 0);
// pass rotated image data to the target image container
targetImg.src = canvas.toDataURL();
}, false);
// start transformation by load event
img.src = origObjURL;
},
attach: function(elem) {
// create webcam preview and attach to DOM element
// pass in actual DOM reference, ID, or CSS selector
if (typeof(elem) == 'string') {
elem = document.getElementById(elem) || document.querySelector(elem);
}
if (!elem) {
return this.dispatch('error', new WebcamError("Could not locate DOM element to attach to."));
}
this.container = elem;
elem.innerHTML = ''; // start with empty element
// insert "peg" so we can insert our preview canvas adjacent to it later on
var peg = document.createElement('div');
elem.appendChild( peg );
this.peg = peg;
// set width/height if not already set
if (!this.params.width) this.params.width = elem.offsetWidth;
if (!this.params.height) this.params.height = elem.offsetHeight;
// make sure we have a nonzero width and height at this point
if (!this.params.width || !this.params.height) {
return this.dispatch('error', new WebcamError("No width and/or height for webcam. Please call set() first, or attach to a visible element."));
}
// set defaults for dest_width / dest_height if not set
if (!this.params.dest_width) this.params.dest_width = this.params.width;
if (!this.params.dest_height) this.params.dest_height = this.params.height;
this.userMedia = _userMedia === undefined ? this.userMedia : _userMedia;
// if force_flash is set, disable userMedia
if (this.params.force_flash) {
_userMedia = this.userMedia;
this.userMedia = null;
}
// check for default fps
if (typeof this.params.fps !== "number") this.params.fps = 30;
// adjust scale if dest_width or dest_height is different
var scaleX = this.params.width / this.params.dest_width;
var scaleY = this.params.height / this.params.dest_height;
if (this.userMedia) {
// setup webcam video container
var video = document.createElement('video');
video.setAttribute('autoplay', 'autoplay');
video.style.width = '' + this.params.dest_width + 'px';
video.style.height = '' + this.params.dest_height + 'px';
if ((scaleX != 1.0) || (scaleY != 1.0)) {
elem.style.overflow = 'hidden';
video.style.webkitTransformOrigin = '0px 0px';
video.style.mozTransformOrigin = '0px 0px';
video.style.msTransformOrigin = '0px 0px';
video.style.oTransformOrigin = '0px 0px';
video.style.transformOrigin = '0px 0px';
video.style.webkitTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
video.style.mozTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
video.style.msTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
video.style.oTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
video.style.transform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
}
// add video element to dom
elem.appendChild( video );
this.video = video;
// ask user for access to their camera
var self = this;
this.mediaDevices.getUserMedia({
"audio": false,
"video": this.params.constraints || {
mandatory: {
minWidth: this.params.dest_width,
minHeight: this.params.dest_height
}
}
})
.then( function(stream) {
// got access, attach stream to video
video.onloadedmetadata = function(e) {
self.stream = stream;
self.loaded = true;
self.live = true;
self.dispatch('load');
self.dispatch('live');
self.flip();
};
// as window.URL.createObjectURL() is deprecated, adding a check so that it works in Safari.
// older browsers may not have srcObject
if ("srcObject" in video) {
video.srcObject = stream;
}
else {
// using URL.createObjectURL() as fallback for old browsers
video.src = window.URL.createObjectURL(stream);
}
})
.catch( function(err) {
// JH 2016-07-31 Instead of dispatching error, now falling back to Flash if userMedia fails (thx @john2014)
// JH 2016-08-07 But only if flash is actually installed -- if not, dispatch error here and now.
if (self.params.enable_flash && self.detectFlash()) {
setTimeout( function() { self.params.force_flash = 1; self.attach(elem); }, 1 );
}
else {
self.dispatch('error', err);
}
});
}
else if (this.iOS) {
// prepare HTML elements
var div = document.createElement('div');
div.id = this.container.id+'-ios_div';
div.className = 'webcamjs-ios-placeholder';
div.style.width = '' + this.params.width + 'px';
div.style.height = '' + this.params.height + 'px';
div.style.textAlign = 'center';
div.style.display = 'table-cell';
div.style.verticalAlign = 'middle';
div.style.backgroundRepeat = 'no-repeat';
div.style.backgroundSize = 'contain';
div.style.backgroundPosition = 'center';
var span = document.createElement('span');
span.className = 'webcamjs-ios-text';
span.innerHTML = this.params.iosPlaceholderText;
div.appendChild(span);
var img = document.createElement('img');
img.id = this.container.id+'-ios_img';
img.style.width = '' + this.params.dest_width + 'px';
img.style.height = '' + this.params.dest_height + 'px';
img.style.display = 'none';
div.appendChild(img);
var input = document.createElement('input');
input.id = this.container.id+'-ios_input';
input.setAttribute('type', 'file');
input.setAttribute('accept', 'image/*');
input.setAttribute('capture', 'camera');
var self = this;
var params = this.params;
// add input listener to load the selected image
input.addEventListener('change', function(event) {
if (event.target.files.length > 0 && event.target.files[0].type.indexOf('image/') == 0) {
var objURL = URL.createObjectURL(event.target.files[0]);
// load image with auto scale and crop
var image = new Image();
image.addEventListener('load', function(event) {
var canvas = document.createElement('canvas');
canvas.width = params.dest_width;
canvas.height = params.dest_height;
var ctx = canvas.getContext('2d');
// crop and scale image for final size
ratio = Math.min(image.width / params.dest_width, image.height / params.dest_height);
var sw = params.dest_width * ratio;
var sh = params.dest_height * ratio;
var sx = (image.width - sw) / 2;
var sy = (image.height - sh) / 2;
ctx.drawImage(image, sx, sy, sw, sh, 0, 0, params.dest_width, params.dest_height);
var dataURL = canvas.toDataURL();
img.src = dataURL;
div.style.backgroundImage = "url('"+dataURL+"')";
}, false);
// read EXIF data
var fileReader = new FileReader();
fileReader.addEventListener('load', function(e) {
var orientation = self.exifOrientation(e.target.result);
if (orientation > 1) {
// image need to rotate (see comments on fixOrientation method for more information)
// transform image and load to image object
self.fixOrientation(objURL, orientation, image);
} else {
// load image data to image object
image.src = objURL;
}
}, false);
// Convert image data to blob format
var http = new XMLHttpRequest();
http.open("GET", objURL, true);
http.responseType = "blob";
http.onload = function(e) {
if (this.status == 200 || this.status === 0) {
fileReader.readAsArrayBuffer(this.response);
}
};
http.send();
}
}, false);
input.style.display = 'none';
elem.appendChild(input);
// make div clickable for open camera interface
div.addEventListener('click', function(event) {
if (params.user_callback) {
// global user_callback defined - create the snapshot
self.snap(params.user_callback, params.user_canvas);
} else {
// no global callback definied for snapshot, load image and wait for external snap method call
input.style.display = 'block';
input.focus();
input.click();
input.style.display = 'none';
}
}, false);
elem.appendChild(div);
this.loaded = true;
this.live = true;
}
else if (this.params.enable_flash && this.detectFlash()) {
// flash fallback
window.Webcam = Webcam; // needed for flash-to-js interface
var div = document.createElement('div');
div.innerHTML = this.getSWFHTML();
elem.appendChild( div );
}
else {
this.dispatch('error', new WebcamError( this.params.noInterfaceFoundText ));
}
// setup final crop for live preview
if (this.params.crop_width && this.params.crop_height) {
var scaled_crop_width = Math.floor( this.params.crop_width * scaleX );
var scaled_crop_height = Math.floor( this.params.crop_height * scaleY );
elem.style.width = '' + scaled_crop_width + 'px';
elem.style.height = '' + scaled_crop_height + 'px';
elem.style.overflow = 'hidden';
elem.scrollLeft = Math.floor( (this.params.width / 2) - (scaled_crop_width / 2) );
elem.scrollTop = Math.floor( (this.params.height / 2) - (scaled_crop_height / 2) );
}
else {
// no crop, set size to desired
elem.style.width = '' + this.params.width + 'px';
elem.style.height = '' + this.params.height + 'px';
}
},
reset: function() {
// shutdown camera, reset to potentially attach again
if (this.preview_active) this.unfreeze();
// attempt to fix issue #64
this.unflip();
if (this.userMedia) {
if (this.stream) {
if (this.stream.getVideoTracks) {
// get video track to call stop on it
var tracks = this.stream.getVideoTracks();
if (tracks && tracks[0] && tracks[0].stop) tracks[0].stop();
}
else if (this.stream.stop) {
// deprecated, may be removed in future
this.stream.stop();
}
}
delete this.stream;
delete this.video;
}
if ((this.userMedia !== true) && this.loaded && !this.iOS) {
// call for turn off camera in flash
var movie = this.getMovie();
if (movie && movie._releaseCamera) movie._releaseCamera();
}
if (this.container) {
this.container.innerHTML = '';
delete this.container;
}
this.loaded = false;
this.live = false;
},
set: function() {
// set one or more params
// variable argument list: 1 param = hash, 2 params = key, value
if (arguments.length == 1) {
for (var key in arguments[0]) {
this.params[key] = arguments[0][key];
}
}
else {
this.params[ arguments[0] ] = arguments[1];
}
},
on: function(name, callback) {
// set callback hook
name = name.replace(/^on/i, '').toLowerCase();
if (!this.hooks[name]) this.hooks[name] = [];
this.hooks[name].push( callback );
},
off: function(name, callback) {
// remove callback hook
name = name.replace(/^on/i, '').toLowerCase();
if (this.hooks[name]) {
if (callback) {
// remove one selected callback from list
var idx = this.hooks[name].indexOf(callback);
if (idx > -1) this.hooks[name].splice(idx, 1);
}
else {
// no callback specified, so clear all
this.hooks[name] = [];
}
}
},
dispatch: function() {
// fire hook callback, passing optional value to it
var name = arguments[0].replace(/^on/i, '').toLowerCase();
var args = Array.prototype.slice.call(arguments, 1);
if (this.hooks[name] && this.hooks[name].length) {
for (var idx = 0, len = this.hooks[name].length; idx < len; idx++) {
var hook = this.hooks[name][idx];
if (typeof(hook) == 'function') {
// callback is function reference, call directly
hook.apply(this, args);
}
else if ((typeof(hook) == 'object') && (hook.length == 2)) {
// callback is PHP-style object instance method
hook[0][hook[1]].apply(hook[0], args);
}
else if (window[hook]) {
// callback is global function name
window[ hook ].apply(window, args);
}
} // loop
return true;
}
else if (name == 'error') {
var message;
if ((args[0] instanceof FlashError) || (args[0] instanceof WebcamError)) {
message = args[0].message;
} else {
message = "Could not access webcam: " + args[0].name + ": " +
args[0].message + " " + args[0].toString();
}
// default error handler if no custom one specified
alert("Webcam.js Error: " + message);
}
return false; // no hook defined
},
setSWFLocation: function(value) {
// for backward compatibility.
this.set('swfURL', value);
},
detectFlash: function() {
// return true if browser supports flash, false otherwise
// Code snippet borrowed from: https://github.com/swfobject/swfobject
var SHOCKWAVE_FLASH = "Shockwave Flash",
SHOCKWAVE_FLASH_AX = "ShockwaveFlash.ShockwaveFlash",
FLASH_MIME_TYPE = "application/x-shockwave-flash",
win = window,
nav = navigator,
hasFlash = false;
if (typeof nav.plugins !== "undefined" && typeof nav.plugins[SHOCKWAVE_FLASH] === "object") {
var desc = nav.plugins[SHOCKWAVE_FLASH].description;
if (desc && (typeof nav.mimeTypes !== "undefined" && nav.mimeTypes[FLASH_MIME_TYPE] && nav.mimeTypes[FLASH_MIME_TYPE].enabledPlugin)) {
hasFlash = true;
}
}
else if (typeof win.ActiveXObject !== "undefined") {
try {
var ax = new ActiveXObject(SHOCKWAVE_FLASH_AX);
if (ax) {
var ver = ax.GetVariable("$version");
if (ver) hasFlash = true;
}
}
catch (e) {;}
}
return hasFlash;
},
getSWFHTML: function() {
// Return HTML for embedding flash based webcam capture movie
var html = '',
swfURL = this.params.swfURL;
// make sure we aren't running locally (flash doesn't work)
if (location.protocol.match(/file/)) {
this.dispatch('error', new FlashError("Flash does not work from local disk. Please run from a web server."));
return 'ERROR: the Webcam.js Flash fallback does not work from local disk. Please run it from a web server.
';
}
// make sure we have flash
if (!this.detectFlash()) {
this.dispatch('error', new FlashError("Adobe Flash Player not found. Please install from get.adobe.com/flashplayer and try again."));
return '' + this.params.flashNotDetectedText + '
';
}
// set default swfURL if not explicitly set
if (!swfURL) {
// find our script tag, and use that base URL
var base_url = '';
var scpts = document.getElementsByTagName('script');
for (var idx = 0, len = scpts.length; idx < len; idx++) {
var src = scpts[idx].getAttribute('src');
if (src && src.match(/\/webcam(\.min)?\.js/)) {
base_url = src.replace(/\/webcam(\.min)?\.js.*$/, '');
idx = len;
}
}
if (base_url) swfURL = base_url + '/webcam.swf';
else swfURL = 'webcam.swf';
}
// if this is the user's first visit, set flashvar so flash privacy settings panel is shown first
if (window.localStorage && !localStorage.getItem('visited')) {
this.params.new_user = 1;
localStorage.setItem('visited', 1);
}
// construct flashvars string
var flashvars = '';
for (var key in this.params) {
if (flashvars) flashvars += '&';
flashvars += key + '=' + escape(this.params[key]);
}
// construct object/embed tag
html += '';
return html;
},
getMovie: function() {
// get reference to movie object/embed in DOM
if (!this.loaded) return this.dispatch('error', new FlashError("Flash Movie is not loaded yet"));
var movie = document.getElementById('webcam_movie_obj');
if (!movie || !movie._snap) movie = document.getElementById('webcam_movie_embed');
if (!movie) this.dispatch('error', new FlashError("Cannot locate Flash movie in DOM"));
return movie;
},
freeze: function() {
// show preview, freeze camera
var self = this;
var params = this.params;
// kill preview if already active
if (this.preview_active) this.unfreeze();
// determine scale factor
var scaleX = this.params.width / this.params.dest_width;
var scaleY = this.params.height / this.params.dest_height;
// must unflip container as preview canvas will be pre-flipped
this.unflip();
// calc final size of image
var final_width = params.crop_width || params.dest_width;
var final_height = params.crop_height || params.dest_height;
// create canvas for holding preview
var preview_canvas = document.createElement('canvas');
preview_canvas.width = final_width;
preview_canvas.height = final_height;
var preview_context = preview_canvas.getContext('2d');
// save for later use
this.preview_canvas = preview_canvas;
this.preview_context = preview_context;
// scale for preview size
if ((scaleX != 1.0) || (scaleY != 1.0)) {
preview_canvas.style.webkitTransformOrigin = '0px 0px';
preview_canvas.style.mozTransformOrigin = '0px 0px';
preview_canvas.style.msTransformOrigin = '0px 0px';
preview_canvas.style.oTransformOrigin = '0px 0px';
preview_canvas.style.transformOrigin = '0px 0px';
preview_canvas.style.webkitTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
preview_canvas.style.mozTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
preview_canvas.style.msTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
preview_canvas.style.oTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
preview_canvas.style.transform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
}
// take snapshot, but fire our own callback
this.snap( function() {
// add preview image to dom, adjust for crop
preview_canvas.style.position = 'relative';
preview_canvas.style.left = '' + self.container.scrollLeft + 'px';
preview_canvas.style.top = '' + self.container.scrollTop + 'px';
self.container.insertBefore( preview_canvas, self.peg );
self.container.style.overflow = 'hidden';
// set flag for user capture (use preview)
self.preview_active = true;
}, preview_canvas );
},
unfreeze: function() {
// cancel preview and resume live video feed
if (this.preview_active) {
// remove preview canvas
this.container.removeChild( this.preview_canvas );
delete this.preview_context;
delete this.preview_canvas;
// unflag
this.preview_active = false;
// re-flip if we unflipped before
this.flip();
}
},
flip: function() {
// flip container horiz (mirror mode) if desired
if (this.params.flip_horiz) {
var sty = this.container.style;
sty.webkitTransform = 'scaleX(-1)';
sty.mozTransform = 'scaleX(-1)';
sty.msTransform = 'scaleX(-1)';
sty.oTransform = 'scaleX(-1)';
sty.transform = 'scaleX(-1)';
sty.filter = 'FlipH';
sty.msFilter = 'FlipH';
}
},
unflip: function() {
// unflip container horiz (mirror mode) if desired
if (this.params.flip_horiz) {
var sty = this.container.style;
sty.webkitTransform = 'scaleX(1)';
sty.mozTransform = 'scaleX(1)';
sty.msTransform = 'scaleX(1)';
sty.oTransform = 'scaleX(1)';
sty.transform = 'scaleX(1)';
sty.filter = '';
sty.msFilter = '';
}
},
savePreview: function(user_callback, user_canvas) {
// save preview freeze and fire user callback
var params = this.params;
var canvas = this.preview_canvas;
var context = this.preview_context;
// render to user canvas if desired
if (user_canvas) {
var user_context = user_canvas.getContext('2d');
user_context.drawImage( canvas, 0, 0 );
}
// fire user callback if desired
user_callback(
user_canvas ? null : canvas.toDataURL('image/' + params.image_format, params.jpeg_quality / 100 ),
canvas,
context
);
// remove preview
if (this.params.unfreeze_snap) this.unfreeze();
},
snap: function(user_callback, user_canvas) {
// use global callback and canvas if not defined as parameter
if (!user_callback) user_callback = this.params.user_callback;
if (!user_canvas) user_canvas = this.params.user_canvas;
// take snapshot and return image data uri
var self = this;
var params = this.params;
if (!this.loaded) return this.dispatch('error', new WebcamError("Webcam is not loaded yet"));
// if (!this.live) return this.dispatch('error', new WebcamError("Webcam is not live yet"));
if (!user_callback) return this.dispatch('error', new WebcamError("Please provide a callback function or canvas to snap()"));
// if we have an active preview freeze, use that
if (this.preview_active) {
this.savePreview( user_callback, user_canvas );
return null;
}
// create offscreen canvas element to hold pixels
var canvas = document.createElement('canvas');
canvas.width = this.params.dest_width;
canvas.height = this.params.dest_height;
var context = canvas.getContext('2d');
// flip canvas horizontally if desired
if (this.params.flip_horiz) {
context.translate( params.dest_width, 0 );
context.scale( -1, 1 );
}
// create inline function, called after image load (flash) or immediately (native)
var func = function() {
// render image if needed (flash)
if (this.src && this.width && this.height) {
context.drawImage(this, 0, 0, params.dest_width, params.dest_height);
}
// crop if desired
if (params.crop_width && params.crop_height) {
var crop_canvas = document.createElement('canvas');
crop_canvas.width = params.crop_width;
crop_canvas.height = params.crop_height;
var crop_context = crop_canvas.getContext('2d');
crop_context.drawImage( canvas,
Math.floor( (params.dest_width / 2) - (params.crop_width / 2) ),
Math.floor( (params.dest_height / 2) - (params.crop_height / 2) ),
params.crop_width,
params.crop_height,
0,
0,
params.crop_width,
params.crop_height
);
// swap canvases
context = crop_context;
canvas = crop_canvas;
}
// render to user canvas if desired
if (user_canvas) {
var user_context = user_canvas.getContext('2d');
user_context.drawImage( canvas, 0, 0 );
}
// fire user callback if desired
user_callback(
user_canvas ? null : canvas.toDataURL('image/' + params.image_format, params.jpeg_quality / 100 ),
canvas,
context
);
};
// grab image frame from userMedia or flash movie
if (this.userMedia) {
// native implementation
context.drawImage(this.video, 0, 0, this.params.dest_width, this.params.dest_height);
// fire callback right away
func();
}
else if (this.iOS) {
var div = document.getElementById(this.container.id+'-ios_div');
var img = document.getElementById(this.container.id+'-ios_img');
var input = document.getElementById(this.container.id+'-ios_input');
// function for handle snapshot event (call user_callback and reset the interface)
iFunc = function(event) {
func.call(img);
img.removeEventListener('load', iFunc);
div.style.backgroundImage = 'none';
img.removeAttribute('src');
input.value = null;
};
if (!input.value) {
// No image selected yet, activate input field
img.addEventListener('load', iFunc);
input.style.display = 'block';
input.focus();
input.click();
input.style.display = 'none';
} else {
// Image already selected
iFunc(null);
}
}
else {
// flash fallback
var raw_data = this.getMovie()._snap();
// render to image, fire callback when complete
var img = new Image();
img.onload = func;
img.src = 'data:image/'+this.params.image_format+';base64,' + raw_data;
}
return null;
},
configure: function(panel) {
// open flash configuration panel -- specify tab name:
// "camera", "privacy", "default", "localStorage", "microphone", "settingsManager"
if (!panel) panel = "camera";
this.getMovie()._configure(panel);
},
flashNotify: function(type, msg) {
// receive notification from flash about event
switch (type) {
case 'flashLoadComplete':
// movie loaded successfully
this.loaded = true;
this.dispatch('load');
break;
case 'cameraLive':
// camera is live and ready to snap
this.live = true;
this.dispatch('live');
break;
case 'error':
// Flash error
this.dispatch('error', new FlashError(msg));
break;
default:
// catch-all event, just in case
// console.log("webcam flash_notify: " + type + ": " + msg);
break;
}
},
b64ToUint6: function(nChr) {
// convert base64 encoded character to 6-bit integer
// from: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding
return nChr > 64 && nChr < 91 ? nChr - 65
: nChr > 96 && nChr < 123 ? nChr - 71
: nChr > 47 && nChr < 58 ? nChr + 4
: nChr === 43 ? 62 : nChr === 47 ? 63 : 0;
},
base64DecToArr: function(sBase64, nBlocksSize) {
// convert base64 encoded string to Uintarray
// from: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding
var sB64Enc = sBase64.replace(/[^A-Za-z0-9\+\/]/g, ""), nInLen = sB64Enc.length,
nOutLen = nBlocksSize ? Math.ceil((nInLen * 3 + 1 >> 2) / nBlocksSize) * nBlocksSize : nInLen * 3 + 1 >> 2,
taBytes = new Uint8Array(nOutLen);
for (var nMod3, nMod4, nUint24 = 0, nOutIdx = 0, nInIdx = 0; nInIdx < nInLen; nInIdx++) {
nMod4 = nInIdx & 3;
nUint24 |= this.b64ToUint6(sB64Enc.charCodeAt(nInIdx)) << 18 - 6 * nMod4;
if (nMod4 === 3 || nInLen - nInIdx === 1) {
for (nMod3 = 0; nMod3 < 3 && nOutIdx < nOutLen; nMod3++, nOutIdx++) {
taBytes[nOutIdx] = nUint24 >>> (16 >>> nMod3 & 24) & 255;
}
nUint24 = 0;
}
}
return taBytes;
},
upload: function(image_data_uri, target_url, callback) {
// submit image data to server using binary AJAX
var form_elem_name = this.params.upload_name || 'webcam';
// detect image format from within image_data_uri
var image_fmt = '';
if (image_data_uri.match(/^data\:image\/(\w+)/))
image_fmt = RegExp.$1;
else
throw "Cannot locate image format in Data URI";
// extract raw base64 data from Data URI
var raw_image_data = image_data_uri.replace(/^data\:image\/\w+\;base64\,/, '');
// contruct use AJAX object
var http = new XMLHttpRequest();
http.open("POST", target_url, true);
// setup progress events
if (http.upload && http.upload.addEventListener) {
http.upload.addEventListener( 'progress', function(e) {
if (e.lengthComputable) {
var progress = e.loaded / e.total;
Webcam.dispatch('uploadProgress', progress, e);
}
}, false );
}
// completion handler
var self = this;
http.onload = function() {
if (callback) callback.apply( self, [http.status, http.responseText, http.statusText] );
Webcam.dispatch('uploadComplete', http.status, http.responseText, http.statusText);
};
// create a blob and decode our base64 to binary
var blob = new Blob( [ this.base64DecToArr(raw_image_data) ], {type: 'image/'+image_fmt} );
// stuff into a form, so servers can easily receive it as a standard file upload
var form = new FormData();
form.append( form_elem_name, blob, form_elem_name+"."+image_fmt.replace(/e/, '') );
// send data to server
http.send(form);
}
};
Webcam.init();
if (typeof define === 'function' && define.amd) {
define( function() { return Webcam; } );
}
else if (typeof module === 'object' && module.exports) {
module.exports = Webcam;
}
else {
window.Webcam = Webcam;
}
}(window));
/**
* PrimeFaces PhotoCam Widget
*/
PrimeFaces.widget.PhotoCam = PrimeFaces.widget.BaseWidget.extend({
attached: false,
init: function(cfg) {
this._super(cfg);
this.cfg.width = this.cfg.width||320;
this.cfg.height = this.cfg.height||240;
this.cfg.photoWidth = this.cfg.photoWidth||this.cfg.width;
this.cfg.photoHeight = this.cfg.photoHeight||this.cfg.height;
this.cfg.jpegQuality = this.cfg.jpegQuality ||90;
if (!("autoStart" in this.cfg)) {
this.cfg.autoStart = true;
}
Webcam.setSWFLocation(this.cfg.camera);
if (this.cfg.autoStart) {
this.attach();
}
},
//@Override
destroy: function() {
this._super();
this.dettach();
},
attach: function() {
if (!this.attached) {
Webcam.reset();
var $this = this;
Webcam.set({
width: this.cfg.width,
height: this.cfg.height,
dest_width: this.cfg.photoWidth,
dest_height: this.cfg.photoHeight,
image_format: this.cfg.format,
jpeg_quality: this.cfg.jpegQuality,
force_flash: this.cfg.forceFlash,
user_callback: function(data) {
var options = {
source: $this.id,
process: $this.cfg.process ? $this.id + ' ' + $this.cfg.process : $this.id,
update: $this.cfg.update,
params: [
{name: $this.id + '_data', value: data}
]
};
PrimeFaces.ajax.Request.handle(options);
}
});
Webcam.attach(this.id);
this.attached = true;
}
},
dettach: function() {
if (this.attached) {
Webcam.reset();
this.attached = false;
}
},
capture: function() {
if (this.attached) {
Webcam.snap();
} else {
PrimeFaces.error('Capture error: AdvancedPhotoCam not attached to the camera');
}
}
});