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// WebcamJS v1.0
// 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 Joseph Huckaby
// Licensed under the MIT License
/* Usage:
<div id="my_camera" style="width:320px; height:240px;"></div>
<div id="my_result"></div>
<script language="JavaScript">
Webcam.attach( '#my_camera' );
function take_snapshot() {
var data_uri = Webcam.snap();
document.getElementById('my_result').innerHTML =
'<img src="'+data_uri+'"/>';
}
</script>
<a href="javascript:void(take_snapshot())">Take Snapshot</a>
*/
var Webcam = {
version: '1.0.0',
// globals
protocol: location.protocol.match(/https/i) ? 'https' : 'http',
swfURL: '', // URI to webcam.swf movie (defaults to cwd)
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
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)
force_flash: false // force flash mode
},
hooks: {
load: null,
live: null,
uploadcomplete: null,
uploadprogress: null,
error: function(msg) {
//alert("Webcam.js Error: " + msg);
document.getElementById('my_photo').innerHTML="Webcam.js Error: " + msg;
}
}, // callback hook functions
init: function() {
// initialize, check for getUserMedia support
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL;
this.userMedia = this.userMedia && !!navigator.getUserMedia && !!window.URL;
// 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;
}
},
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', "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;
// 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;
// if force_flash is set, disable userMedia
if (this.params.force_flash) this.userMedia = null;
// 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;
navigator.getUserMedia({
"audio": false,
"video": true
},
function(stream) {
// got access, attach stream to video
video.src = window.URL.createObjectURL( stream ) || stream;
Webcam.stream = stream;
Webcam.loaded = true;
Webcam.live = true;
Webcam.dispatch('load');
Webcam.dispatch('live');
},
function(err) {
return self.dispatch('error', "Could not access webcam.");
});
}
else {
// flash fallback
var div = document.createElement('div');
div.innerHTML = this.getSWFHTML();
elem.appendChild( div );
}
// 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.userMedia) {
try { this.stream.stop(); } catch (e) {;}
delete this.stream;
delete this.video;
}
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
// supported hooks: onLoad, onError, onLive
name = name.replace(/^on/i, '').toLowerCase();
if (typeof(this.hooks[name]) == 'undefined')
throw "Event type not supported: " + name;
this.hooks[name] = callback;
},
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]) {
if (typeof(this.hooks[name]) == 'function') {
// callback is function reference, call directly
this.hooks[name].apply(this, args);
}
else if (typeof(this.hooks[name]) == 'array') {
// callback is PHP-style object instance method
this.hooks[name][0][this.hooks[name][1]].apply(this.hooks[name][0], args);
}
else if (window[this.hooks[name]]) {
// callback is global function name
window[ this.hooks[name] ].apply(window, args);
}
return true;
}
return false; // no hook defined
},
setSWFLocation: function(url) {
// set location of SWF movie (defaults to webcam.swf in cwd)
this.swfURL = url;
},
getSWFHTML: function() {
// Return HTML for embedding flash based webcam capture movie
var html = '';
// make sure we aren't running locally (flash doesn't work)
if (location.protocol.match(/file/)) {
return '<h1 style="color:red">Sorry, the Webcam.js Flash fallback does not work from local disk. Please upload it to a web server first.</h1>';
}
// set default swfURL if not explicitly set
if (!this.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) this.swfURL = base_url + '/webcam.swf';
else this.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 += '<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" type="application/x-shockwave-flash" codebase="'+this.protocol+'://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="'+this.params.width+'" height="'+this.params.height+'" id="webcam_movie_obj" align="middle"><param name="wmode" value="opaque" /><param name="allowScriptAccess" value="always" /><param name="allowFullScreen" value="false" /><param name="movie" value="'+this.swfURL+'" /><param name="loop" value="false" /><param name="menu" value="false" /><param name="quality" value="best" /><param name="bgcolor" value="#ffffff" /><param name="flashvars" value="'+flashvars+'"/><embed id="webcam_movie_embed" src="'+this.swfURL+'" wmode="opaque" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="'+this.params.width+'" height="'+this.params.height+'" name="webcam_movie_embed" align="middle" allowScriptAccess="always" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="'+flashvars+'"></embed></object>';
return html;
},
getMovie: function() {
// get reference to movie object/embed in DOM
if (!this.loaded) return this.dispatch('error', "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', "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;
// 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;
}
},
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
this.unfreeze();
},
snap: function(user_callback, user_canvas) {
// take snapshot and return image data uri
var self = this;
var params = this.params;
if (!this.loaded) return this.dispatch('error', "Webcam is not loaded yet");
if (!this.live) return this.dispatch('error', "Webcam is not live yet");
if (!user_callback) return this.dispatch('error', "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');
// 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 {
// 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', 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
if (callback) Webcam.on('uploadComplete', callback);
var form_elem_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
http.onload = function() {
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();
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