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Basic webcam setup with modern web api
This commit is contained in:
Bartuccio Antoine
@@ -1,399 +0,0 @@
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// WebcamJS v1.0
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// Webcam library for capturing JPEG/PNG images in JavaScript
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// Attempts getUserMedia, falls back to Flash
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// Author: Joseph Huckaby: http://github.com/jhuckaby
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// Based on JPEGCam: http://code.google.com/p/jpegcam/
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// Copyright (c) 2012 Joseph Huckaby
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// Licensed under the MIT License
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/* Usage:
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<div id="my_camera" style="width:320px; height:240px;"></div>
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<div id="my_result"></div>
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<script language="JavaScript">
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Webcam.attach( '#my_camera' );
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function take_snapshot() {
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var data_uri = Webcam.snap();
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document.getElementById('my_result').innerHTML =
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'<img src="'+data_uri+'"/>';
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}
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</script>
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<a href="javascript:void(take_snapshot())">Take Snapshot</a>
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*/
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var Webcam = {
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version: '1.0.0',
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// globals
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protocol: location.protocol.match(/https/i) ? 'https' : 'http',
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swfURL: '', // URI to webcam.swf movie (defaults to cwd)
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loaded: false, // true when webcam movie finishes loading
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live: false, // true when webcam is initialized and ready to snap
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userMedia: true, // true when getUserMedia is supported natively
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params: {
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width: 0,
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height: 0,
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dest_width: 0, // size of captured image
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dest_height: 0, // these default to width/height
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image_format: 'jpeg', // image format (may be jpeg or png)
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jpeg_quality: 90, // jpeg image quality from 0 (worst) to 100 (best)
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force_flash: false // force flash mode
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},
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hooks: {
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load: null,
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live: null,
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uploadcomplete: null,
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uploadprogress: null,
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error: function(msg) { alert("Webcam.js Error: " + msg); }
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}, // callback hook functions
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init: function() {
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// initialize, check for getUserMedia support
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navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
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window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL;
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this.userMedia = this.userMedia && !!navigator.getUserMedia && !!window.URL;
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// Older versions of firefox (< 21) apparently claim support but user media does not actually work
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if (navigator.userAgent.match(/Firefox\D+(\d+)/)) {
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if (parseInt(RegExp.$1, 10) < 21) this.userMedia = null;
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}
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},
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attach: function(elem) {
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// create webcam preview and attach to DOM element
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// pass in actual DOM reference, ID, or CSS selector
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if (typeof(elem) == 'string') {
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elem = document.getElementById(elem) || document.querySelector(elem);
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}
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if (!elem) {
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return this.dispatch('error', "Could not locate DOM element to attach to.");
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}
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this.container = elem;
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if (!this.params.width) this.params.width = elem.offsetWidth;
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if (!this.params.height) this.params.height = elem.offsetHeight;
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// set defaults for dest_width / dest_height if not set
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if (!this.params.dest_width) this.params.dest_width = this.params.width;
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if (!this.params.dest_height) this.params.dest_height = this.params.height;
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// if force_flash is set, disable userMedia
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if (this.params.force_flash) this.userMedia = null;
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if (this.userMedia) {
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// setup webcam video container
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var video = document.createElement('video');
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video.setAttribute('autoplay', 'autoplay');
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video.style.width = '' + this.params.dest_width + 'px';
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video.style.height = '' + this.params.dest_height + 'px';
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// adjust scale if dest_width or dest_height is different
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var scaleX = this.params.width / this.params.dest_width;
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var scaleY = this.params.height / this.params.dest_height;
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if ((scaleX != 1.0) || (scaleY != 1.0)) {
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elem.style.overflow = 'visible';
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video.style.webkitTransformOrigin = '0px 0px';
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video.style.mozTransformOrigin = '0px 0px';
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video.style.msTransformOrigin = '0px 0px';
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video.style.oTransformOrigin = '0px 0px';
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video.style.transformOrigin = '0px 0px';
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video.style.webkitTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
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video.style.mozTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
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video.style.msTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
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video.style.oTransform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
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video.style.transform = 'scaleX('+scaleX+') scaleY('+scaleY+')';
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}
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// add video element to dom
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elem.appendChild( video );
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this.video = video;
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// create offscreen canvas element to hold pixels later on
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var canvas = document.createElement('canvas');
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canvas.width = this.params.dest_width;
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canvas.height = this.params.dest_height;
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var context = canvas.getContext('2d');
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this.context = context;
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this.canvas = canvas;
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// ask user for access to their camera
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var self = this;
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navigator.getUserMedia({
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"audio": false,
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"video": true
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},
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function(stream) {
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// got access, attach stream to video
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video.src = window.URL.createObjectURL( stream ) || stream;
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Webcam.stream = stream;
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Webcam.loaded = true;
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Webcam.live = true;
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Webcam.dispatch('load');
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Webcam.dispatch('live');
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},
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function(err) {
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return self.dispatch('error', "Could not access webcam.");
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});
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}
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else {
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// flash fallback
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elem.innerHTML = this.getSWFHTML();
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}
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},
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reset: function() {
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// shutdown camera, reset to potentially attach again
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if (this.userMedia) {
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try { this.stream.stop(); } catch (e) {;}
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delete this.stream;
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delete this.canvas;
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delete this.context;
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delete this.video;
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}
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this.container.innerHTML = '';
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delete this.container;
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this.loaded = false;
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this.live = false;
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},
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set: function() {
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// set one or more params
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// variable argument list: 1 param = hash, 2 params = key, value
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if (arguments.length == 1) {
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for (var key in arguments[0]) {
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this.params[key] = arguments[0][key];
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}
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}
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else {
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this.params[ arguments[0] ] = arguments[1];
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}
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},
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on: function(name, callback) {
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// set callback hook
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// supported hooks: onLoad, onError, onLive
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name = name.replace(/^on/i, '').toLowerCase();
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if (typeof(this.hooks[name]) == 'undefined')
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throw "Event type not supported: " + name;
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this.hooks[name] = callback;
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},
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dispatch: function() {
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// fire hook callback, passing optional value to it
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var name = arguments[0].replace(/^on/i, '').toLowerCase();
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var args = Array.prototype.slice.call(arguments, 1);
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if (this.hooks[name]) {
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if (typeof(this.hooks[name]) == 'function') {
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// callback is function reference, call directly
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this.hooks[name].apply(this, args);
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}
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else if (typeof(this.hooks[name]) == 'array') {
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// callback is PHP-style object instance method
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this.hooks[name][0][this.hooks[name][1]].apply(this.hooks[name][0], args);
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}
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else if (window[this.hooks[name]]) {
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// callback is global function name
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window[ this.hooks[name] ].apply(window, args);
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}
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return true;
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}
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return false; // no hook defined
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},
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setSWFLocation: function(url) {
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// set location of SWF movie (defaults to webcam.swf in cwd)
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this.swfURL = url;
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},
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getSWFHTML: function() {
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// Return HTML for embedding flash based webcam capture movie
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var html = '';
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// make sure we aren't running locally (flash doesn't work)
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if (location.protocol.match(/file/)) {
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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>';
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}
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// set default swfURL if not explicitly set
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if (!this.swfURL) {
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// find our script tag, and use that base URL
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var base_url = '';
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var scpts = document.getElementsByTagName('script');
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for (var idx = 0, len = scpts.length; idx < len; idx++) {
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var src = scpts[idx].getAttribute('src');
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if (src && src.match(/\/webcam(\.min)?\.js/)) {
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base_url = src.replace(/\/webcam(\.min)?\.js.*$/, '');
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idx = len;
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}
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}
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if (base_url) this.swfURL = base_url + '/webcam.swf';
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else this.swfURL = 'webcam.swf';
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}
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// if this is the user's first visit, set flashvar so flash privacy settings panel is shown first
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if (window.localStorage && !localStorage.getItem('visited')) {
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this.params.new_user = 1;
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localStorage.setItem('visited', 1);
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}
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// construct flashvars string
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var flashvars = '';
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for (var key in this.params) {
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if (flashvars) flashvars += '&';
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flashvars += key + '=' + escape(this.params[key]);
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}
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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="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+'" 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>';
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return html;
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},
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getMovie: function() {
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// get reference to movie object/embed in DOM
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if (!this.loaded) return this.dispatch('error', "Flash Movie is not loaded yet");
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var movie = document.getElementById('webcam_movie_obj');
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if (!movie || !movie._snap) movie = document.getElementById('webcam_movie_embed');
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if (!movie) this.dispatch('error', "Cannot locate Flash movie in DOM");
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return movie;
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},
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snap: function() {
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// take snapshot and return image data uri
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if (!this.loaded) return this.dispatch('error', "Webcam is not loaded yet");
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if (!this.live) return this.dispatch('error', "Webcam is not live yet");
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if (this.userMedia) {
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// native implementation
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this.context.drawImage(this.video, 0, 0, this.params.dest_width, this.params.dest_height);
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return this.canvas.toDataURL('image/' + this.params.image_format, this.params.jpeg_quality / 100 );
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}
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else {
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// flash fallback
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var raw_data = this.getMovie()._snap();
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return 'data:image/'+this.params.image_format+';base64,' + raw_data;
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}
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},
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configure: function(panel) {
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// open flash configuration panel -- specify tab name:
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// "camera", "privacy", "default", "localStorage", "microphone", "settingsManager"
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if (!panel) panel = "camera";
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this.getMovie()._configure(panel);
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},
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flashNotify: function(type, msg) {
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// receive notification from flash about event
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switch (type) {
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case 'flashLoadComplete':
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// movie loaded successfully
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this.loaded = true;
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this.dispatch('load');
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break;
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case 'cameraLive':
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// camera is live and ready to snap
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this.live = true;
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this.dispatch('live');
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break;
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case 'error':
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// Flash error
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this.dispatch('error', msg);
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break;
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default:
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// catch-all event, just in case
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// console.log("webcam flash_notify: " + type + ": " + msg);
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break;
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}
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},
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b64ToUint6: function(nChr) {
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// convert base64 encoded character to 6-bit integer
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// from: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding
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return nChr > 64 && nChr < 91 ? nChr - 65
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: nChr > 96 && nChr < 123 ? nChr - 71
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: nChr > 47 && nChr < 58 ? nChr + 4
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: nChr === 43 ? 62 : nChr === 47 ? 63 : 0;
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},
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base64DecToArr: function(sBase64, nBlocksSize) {
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// convert base64 encoded string to Uintarray
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// from: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding
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var sB64Enc = sBase64.replace(/[^A-Za-z0-9\+\/]/g, ""), nInLen = sB64Enc.length,
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nOutLen = nBlocksSize ? Math.ceil((nInLen * 3 + 1 >> 2) / nBlocksSize) * nBlocksSize : nInLen * 3 + 1 >> 2,
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taBytes = new Uint8Array(nOutLen);
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for (var nMod3, nMod4, nUint24 = 0, nOutIdx = 0, nInIdx = 0; nInIdx < nInLen; nInIdx++) {
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nMod4 = nInIdx & 3;
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nUint24 |= this.b64ToUint6(sB64Enc.charCodeAt(nInIdx)) << 18 - 6 * nMod4;
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if (nMod4 === 3 || nInLen - nInIdx === 1) {
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for (nMod3 = 0; nMod3 < 3 && nOutIdx < nOutLen; nMod3++, nOutIdx++) {
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taBytes[nOutIdx] = nUint24 >>> (16 >>> nMod3 & 24) & 255;
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}
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nUint24 = 0;
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}
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}
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return taBytes;
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},
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upload: function(image_data_uri, target_url, callback, form_elem_name='webcam', csrf=null) {
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// submit image data to server using binary AJAX
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if (callback) Webcam.on('uploadComplete', callback);
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// detect image format from within image_data_uri
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var image_fmt = '';
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if (image_data_uri.match(/^data\:image\/(\w+)/))
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image_fmt = RegExp.$1;
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else
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throw "Cannot locate image format in Data URI";
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// extract raw base64 data from Data URI
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var raw_image_data = image_data_uri.replace(/^data\:image\/\w+\;base64\,/, '');
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// contruct use AJAX object
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var http = new XMLHttpRequest();
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http.open("POST", target_url, true);
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// setup progress events
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if (http.upload && http.upload.addEventListener) {
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http.upload.addEventListener( 'progress', function(e) {
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if (e.lengthComputable) {
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var progress = e.loaded / e.total;
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Webcam.dispatch('uploadProgress', progress, e);
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}
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}, false );
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}
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// completion handler
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http.onload = function() {
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Webcam.dispatch('uploadComplete', http.status, http.responseText, http.statusText);
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};
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// create a blob and decode our base64 to binary
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var blob = new Blob( [ this.base64DecToArr(raw_image_data) ], {type: 'image/'+image_fmt} );
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// stuff into a form, so servers can easily receive it as a standard file upload
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var form = new FormData();
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if (csrf)
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form.append(csrf.name, csrf.value);
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form.append( form_elem_name, blob, form_elem_name+"."+image_fmt.replace(/e/, '') );
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// send data to server
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http.send(form);
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}
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};
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Webcam.init();
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