diff johndyer-mediaelement-13fa20a/src/js/me-shim.js @ 0:032bc65ebafc

added core components

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/johndyer-mediaelement-13fa20a/src/js/me-shim.js	Wed Mar 06 15:45:48 2013 +0000
@@ -0,0 +1,529 @@
+
+// Handles calls from Flash/Silverlight and reports them as native <video/audio> events and properties
+mejs.MediaPluginBridge = {
+
+	pluginMediaElements:{},
+	htmlMediaElements:{},
+
+	registerPluginElement: function (id, pluginMediaElement, htmlMediaElement) {
+		this.pluginMediaElements[id] = pluginMediaElement;
+		this.htmlMediaElements[id] = htmlMediaElement;
+	},
+
+	// when Flash/Silverlight is ready, it calls out to this method
+	initPlugin: function (id) {
+
+		var pluginMediaElement = this.pluginMediaElements[id],
+			htmlMediaElement = this.htmlMediaElements[id];
+
+		// find the javascript bridge
+		switch (pluginMediaElement.pluginType) {
+			case "flash":
+				pluginMediaElement.pluginElement = pluginMediaElement.pluginApi = document.getElementById(id);
+				break;
+			case "silverlight":
+				pluginMediaElement.pluginElement = document.getElementById(pluginMediaElement.id);
+				pluginMediaElement.pluginApi = pluginMediaElement.pluginElement.Content.MediaElementJS;
+				break;
+		}
+
+		if (pluginMediaElement.pluginApi != null && pluginMediaElement.success) {
+			pluginMediaElement.success(pluginMediaElement, htmlMediaElement);
+		}
+	},
+
+	// receives events from Flash/Silverlight and sends them out as HTML5 media events
+	// http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html
+	fireEvent: function (id, eventName, values) {
+
+		var
+			e,
+			i,
+			bufferedTime,
+			pluginMediaElement = this.pluginMediaElements[id];
+
+		pluginMediaElement.ended = false;
+		pluginMediaElement.paused = true;
+
+		// fake event object to mimic real HTML media event.
+		e = {
+			type: eventName,
+			target: pluginMediaElement
+		};
+
+		// attach all values to element and event object
+		for (i in values) {
+			pluginMediaElement[i] = values[i];
+			e[i] = values[i];
+		}
+
+		// fake the newer W3C buffered TimeRange (loaded and total have been removed)
+		bufferedTime = values.bufferedTime || 0;
+
+		e.target.buffered = e.buffered = {
+			start: function(index) {
+				return 0;
+			},
+			end: function (index) {
+				return bufferedTime;
+			},
+			length: 1
+		};
+
+		pluginMediaElement.dispatchEvent(e.type, e);
+	}
+};
+
+/*
+Default options
+*/
+mejs.MediaElementDefaults = {
+	// allows testing on HTML5, flash, silverlight
+	// auto: attempts to detect what the browser can do
+	// native: forces HTML5 playback
+	// shim: disallows HTML5, will attempt either Flash or Silverlight
+	// none: forces fallback view
+	mode: 'auto',
+	// remove or reorder to change plugin priority and availability
+	plugins: ['flash','silverlight'],
+	// shows debug errors on screen
+	enablePluginDebug: false,
+	// overrides the type specified, useful for dynamic instantiation
+	type: '',
+	// path to Flash and Silverlight plugins
+	pluginPath: mejs.Utility.getScriptPath(['mediaelement.js','mediaelement.min.js','mediaelement-and-player.js','mediaelement-and-player.min.js']),
+	// name of flash file
+	flashName: 'flashmediaelement.swf',
+	// turns on the smoothing filter in Flash
+	enablePluginSmoothing: false,
+	// name of silverlight file
+	silverlightName: 'silverlightmediaelement.xap',
+	// default if the <video width> is not specified
+	defaultVideoWidth: 480,
+	// default if the <video height> is not specified
+	defaultVideoHeight: 270,
+	// overrides <video width>
+	pluginWidth: -1,
+	// overrides <video height>
+	pluginHeight: -1,
+	// rate in milliseconds for Flash and Silverlight to fire the timeupdate event
+	// larger number is less accurate, but less strain on plugin->JavaScript bridge
+	timerRate: 250,
+	success: function () { },
+	error: function () { }
+};
+
+/*
+Determines if a browser supports the <video> or <audio> element
+and returns either the native element or a Flash/Silverlight version that
+mimics HTML5 MediaElement
+*/
+mejs.MediaElement = function (el, o) {
+	return mejs.HtmlMediaElementShim.create(el,o);
+};
+
+mejs.HtmlMediaElementShim = {
+
+	create: function(el, o) {
+		var
+			options = mejs.MediaElementDefaults,
+			htmlMediaElement = (typeof(el) == 'string') ? document.getElementById(el) : el,
+			tagName = htmlMediaElement.tagName.toLowerCase(),
+			isMediaTag = (tagName == 'audio' || tagName == 'video'),
+			src = htmlMediaElement.getAttribute('src'),
+			poster = htmlMediaElement.getAttribute('poster'),
+			autoplay =  htmlMediaElement.getAttribute('autoplay'),
+			preload =  htmlMediaElement.getAttribute('preload'),
+			controls =  htmlMediaElement.getAttribute('controls'),
+			playback,
+			prop;
+
+		// extend options
+		for (prop in o) {
+			options[prop] = o[prop];
+		}
+
+					
+		// is this a true HTML5 media element
+		if (isMediaTag) {
+			isVideo = (htmlMediaElement.tagName.toLowerCase() == 'video');
+		} else {
+			// fake source from <a href=""></a>
+			src = htmlMediaElement.getAttribute('href');		
+		}
+
+		// clean up attributes
+		src = (src == 'undefined' || src == '' || src === null) ? null : src;		
+		poster = (typeof poster == 'undefined' || poster === null) ? '' : poster;
+		preload = (typeof preload == 'undefined' || preload === null || preload === 'false') ? 'none' : preload;
+		autoplay = !(typeof autoplay == 'undefined' || autoplay === null || autoplay === 'false');
+		controls = !(typeof controls == 'undefined' || controls === null || controls === 'false');
+
+		// test for HTML5 and plugin capabilities
+		playback = this.determinePlayback(htmlMediaElement, options, mejs.MediaFeatures.supportsMediaTag, isMediaTag, src);
+
+		if (playback.method == 'native') {
+			// second fix for android
+			if (mejs.MediaFeatures.isBustedAndroid) {
+				htmlMediaElement.src = playback.url;
+				htmlMediaElement.addEventListener('click', function() {
+						htmlMediaElement.play();
+				}, true);
+			}
+		
+			// add methods to native HTMLMediaElement
+			return this.updateNative( playback.htmlMediaElement, options, autoplay, preload, playback);
+		} else if (playback.method !== '') {
+			// create plugin to mimic HTMLMediaElement
+			return this.createPlugin( htmlMediaElement, options, playback.method, (playback.url !== null) ? mejs.Utility.absolutizeUrl(playback.url) : '', poster, autoplay, preload, controls);
+		} else {
+			// boo, no HTML5, no Flash, no Silverlight.
+			this.createErrorMessage( htmlMediaElement, options, (playback.url !== null) ? mejs.Utility.absolutizeUrl(playback.url) : '', poster );
+		}
+	},
+	
+	videoRegExp: /(mp4|m4v|ogg|ogv|webm|flv|wmv|mpeg)/gi,
+	
+	determinePlayback: function(htmlMediaElement, options, supportsMediaTag, isMediaTag, src) {
+		var
+			mediaFiles = [],
+			i,
+			j,
+			k,
+			l,
+			n,
+			type,
+			result = { method: '', url: '', htmlMediaElement: htmlMediaElement, isVideo: (htmlMediaElement.tagName.toLowerCase() != 'audio')},
+			pluginName,
+			pluginVersions,
+			pluginInfo,
+			dummy;
+			
+		// STEP 1: Get URL and type from <video src> or <source src>
+
+		// supplied type overrides <video type> and <source type>
+		if (typeof options.type != 'undefined' && options.type !== '') {
+			
+			// accept either string or array of types
+			if (typeof options.type == 'string') {
+				mediaFiles.push({type:options.type, url:src});
+			} else {
+				
+				for (i=0; i<options.type.length; i++) {
+					mediaFiles.push({type:options.type[i], url:src});
+				}
+			}
+
+		// test for src attribute first
+		} else if (src !== null) {
+			type = this.formatType(src, htmlMediaElement.getAttribute('type'));
+			mediaFiles.push({type:type, url:src});
+
+		// then test for <source> elements
+		} else {
+			// test <source> types to see if they are usable
+			for (i = 0; i < htmlMediaElement.childNodes.length; i++) {
+				n = htmlMediaElement.childNodes[i];
+				if (n.nodeType == 1 && n.tagName.toLowerCase() == 'source') {
+					src = n.getAttribute('src');
+					type = this.formatType(src, n.getAttribute('type'));
+					mediaFiles.push({type:type, url:src});
+				}
+			}
+		}
+
+		// STEP 2: Test for playback method
+		
+		// special case for Android which sadly doesn't implement the canPlayType function (always returns '')
+		if (mejs.MediaFeatures.isBustedAndroid) {
+			htmlMediaElement.canPlayType = function(type) {
+				return (type.match(/video\/(mp4|m4v)/gi) !== null) ? 'maybe' : '';
+			};
+		}		
+		
+
+		// test for native playback first
+		if (supportsMediaTag && (options.mode === 'auto' || options.mode === 'native')) {
+						
+			if (!isMediaTag) {
+				var tagName = 'video';
+				if (mediaFiles.length > 0 && mediaFiles[0].url !== null && this.getTypeFromFile(mediaFiles[0].url).indexOf('audio') > -1) {
+					tagName = 'audio';
+					result.isVideo = false;
+				}
+				
+				// create a real HTML5 Media Element 
+				dummy = document.createElement(tagName);			
+				htmlMediaElement.parentNode.insertBefore(dummy, htmlMediaElement);
+				htmlMediaElement.style.display = 'none';
+				
+				// use this one from now on
+				result.htmlMediaElement = htmlMediaElement = dummy;
+			}
+				
+			for (i=0; i<mediaFiles.length; i++) {
+				// normal check
+				if (htmlMediaElement.canPlayType(mediaFiles[i].type).replace(/no/, '') !== '' 
+					// special case for Mac/Safari 5.0.3 which answers '' to canPlayType('audio/mp3') but 'maybe' to canPlayType('audio/mpeg')
+					|| htmlMediaElement.canPlayType(mediaFiles[i].type.replace(/mp3/,'mpeg')).replace(/no/, '') !== '') {
+					result.method = 'native';
+					result.url = mediaFiles[i].url;
+					break;
+				}
+			}			
+			
+			if (result.method === 'native') {
+				return result;
+			}
+		}
+
+		// if native playback didn't work, then test plugins
+		if (options.mode === 'auto' || options.mode === 'shim') {
+			for (i=0; i<mediaFiles.length; i++) {
+				type = mediaFiles[i].type;
+
+				// test all plugins in order of preference [silverlight, flash]
+				for (j=0; j<options.plugins.length; j++) {
+
+					pluginName = options.plugins[j];
+
+					// test version of plugin (for future features)
+					pluginVersions = mejs.plugins[pluginName];
+					for (k=0; k<pluginVersions.length; k++) {
+						pluginInfo = pluginVersions[k];
+
+						// test if user has the correct plugin version
+						if (mejs.PluginDetector.hasPluginVersion(pluginName, pluginInfo.version)) {
+
+							// test for plugin playback types
+							for (l=0; l<pluginInfo.types.length; l++) {
+								// find plugin that can play the type
+								if (type == pluginInfo.types[l]) {
+									result.method = pluginName;
+									result.url = mediaFiles[i].url;
+									return result;
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+		
+		// what if there's nothing to play? just grab the first available
+		if (result.method === '') {
+			result.url = mediaFiles[0].url;
+		}
+
+		return result;
+	},
+
+	formatType: function(url, type) {
+		var ext;
+
+		// if no type is supplied, fake it with the extension
+		if (url && !type) {		
+			return this.getTypeFromFile(url);
+		} else {
+			// only return the mime part of the type in case the attribute contains the codec
+			// see http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#the-source-element
+			// `video/mp4; codecs="avc1.42E01E, mp4a.40.2"` becomes `video/mp4`
+			
+			if (type && ~type.indexOf(';')) {
+				return type.substr(0, type.indexOf(';')); 
+			} else {
+				return type;
+			}
+		}
+	},
+	
+	getTypeFromFile: function(url) {
+		var ext = url.substring(url.lastIndexOf('.') + 1);
+		return (this.videoRegExp.test(ext) ? 'video' : 'audio') + '/' + ext;
+	},
+
+	createErrorMessage: function(htmlMediaElement, options, downloadUrl, poster) {
+		var errorContainer = document.createElement('div');
+		errorContainer.className = 'me-cannotplay';
+
+		try {
+			errorContainer.style.width = htmlMediaElement.width + 'px';
+			errorContainer.style.height = htmlMediaElement.height + 'px';
+		} catch (e) {}
+
+		errorContainer.innerHTML = (poster !== '') ?
+			'<a href="' + downloadUrl + '"><img src="' + poster + '" /></a>' :
+			'<a href="' + downloadUrl + '"><span>Download File</span></a>';
+
+		htmlMediaElement.parentNode.insertBefore(errorContainer, htmlMediaElement);
+		htmlMediaElement.style.display = 'none';
+
+		options.error(htmlMediaElement);
+	},
+
+	createPlugin:function(htmlMediaElement, options, isVideo, pluginType, mediaUrl, poster, autoplay, preload, controls) {
+		var width = 1,
+			height = 1,
+			pluginid = 'me_' + pluginType + '_' + (mejs.meIndex++),
+			pluginMediaElement = new mejs.PluginMediaElement(pluginid, pluginType, mediaUrl),
+			container = document.createElement('div'),
+			specialIEContainer,
+			node,
+			initVars;
+
+		// check for placement inside a <p> tag (sometimes WYSIWYG editors do this)
+		node = htmlMediaElement.parentNode;
+		while (node !== null && node.tagName.toLowerCase() != 'body') {
+			if (node.parentNode.tagName.toLowerCase() == 'p') {
+				node.parentNode.parentNode.insertBefore(node, node.parentNode);
+				break;
+			}
+			node = node.parentNode;
+		}
+
+		if (isVideo) {
+			width = (options.videoWidth > 0) ? options.videoWidth : (htmlMediaElement.getAttribute('width') !== null) ? htmlMediaElement.getAttribute('width') : options.defaultVideoWidth;
+			height = (options.videoHeight > 0) ? options.videoHeight : (htmlMediaElement.getAttribute('height') !== null) ? htmlMediaElement.getAttribute('height') : options.defaultVideoHeight;
+		} else {
+			if (options.enablePluginDebug) {
+				width = 320;
+				height = 240;
+			}
+		}
+
+		// register plugin
+		pluginMediaElement.success = options.success;
+		mejs.MediaPluginBridge.registerPluginElement(pluginid, pluginMediaElement, htmlMediaElement);
+
+		// add container (must be added to DOM before inserting HTML for IE)
+		container.className = 'me-plugin';
+		htmlMediaElement.parentNode.insertBefore(container, htmlMediaElement);
+
+		// flash/silverlight vars
+		initVars = [
+			'id=' + pluginid,
+			'isvideo=' + ((isVideo) ? "true" : "false"),
+			'autoplay=' + ((autoplay) ? "true" : "false"),
+			'preload=' + preload,
+			'width=' + width,
+			'startvolume=' + options.startVolume,
+			'timerrate=' + options.timerRate,
+			'height=' + height];
+
+		if (mediaUrl !== null) {
+			if (pluginType == 'flash') {
+				initVars.push('file=' + mejs.Utility.encodeUrl(mediaUrl));
+			} else {
+				initVars.push('file=' + mediaUrl);
+			}
+		}
+		if (options.enablePluginDebug) {
+			initVars.push('debug=true');
+		}
+		if (options.enablePluginSmoothing) {
+			initVars.push('smoothing=true');
+		}
+		if (controls) {
+			initVars.push('controls=true'); // shows controls in the plugin if desired
+		}
+
+		switch (pluginType) {
+			case 'silverlight':
+				container.innerHTML =
+'<object data="data:application/x-silverlight-2," type="application/x-silverlight-2" id="' + pluginid + '" name="' + pluginid + '" width="' + width + '" height="' + height + '">' +
+'<param name="initParams" value="' + initVars.join(',') + '" />' +
+'<param name="windowless" value="true" />' +
+'<param name="background" value="black" />' +
+'<param name="minRuntimeVersion" value="3.0.0.0" />' +
+'<param name="autoUpgrade" value="true" />' +
+'<param name="source" value="' + options.pluginPath + options.silverlightName + '" />' +
+'</object>';
+					break;
+
+			case 'flash':
+
+				if (mejs.MediaFeatures.isIE) {
+					specialIEContainer = document.createElement('div');
+					container.appendChild(specialIEContainer);
+					specialIEContainer.outerHTML =
+'<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab" ' +
+'id="' + pluginid + '" width="' + width + '" height="' + height + '">' +
+'<param name="movie" value="' + options.pluginPath + options.flashName + '?x=' + (new Date()) + '" />' +
+'<param name="flashvars" value="' + initVars.join('&amp;') + '" />' +
+'<param name="quality" value="high" />' +
+'<param name="bgcolor" value="#000000" />' +
+'<param name="wmode" value="transparent" />' +
+'<param name="allowScriptAccess" value="always" />' +
+'<param name="allowFullScreen" value="true" />' +
+'</object>';
+
+				} else {
+
+					container.innerHTML =
+'<embed id="' + pluginid + '" name="' + pluginid + '" ' +
+'play="true" ' +
+'loop="false" ' +
+'quality="high" ' +
+'bgcolor="#000000" ' +
+'wmode="transparent" ' +
+'allowScriptAccess="always" ' +
+'allowFullScreen="true" ' +
+'type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" ' +
+'src="' + options.pluginPath + options.flashName + '" ' +
+'flashvars="' + initVars.join('&') + '" ' +
+'width="' + width + '" ' +
+'height="' + height + '"></embed>';
+				}
+				break;
+		}
+		// hide original element
+		htmlMediaElement.style.display = 'none';
+
+		// FYI: options.success will be fired by the MediaPluginBridge
+		
+		return pluginMediaElement;
+	},
+
+	updateNative: function(htmlMediaElement, options, autoplay, preload, playback) {
+		// add methods to video object to bring it into parity with Flash Object
+		for (var m in mejs.HtmlMediaElement) {
+			htmlMediaElement[m] = mejs.HtmlMediaElement[m];
+		}
+
+		/*
+		Chrome now supports preload="none"
+		if (mejs.MediaFeatures.isChrome) {
+		
+			// special case to enforce preload attribute (Chrome doesn't respect this)
+			if (preload === 'none' && !autoplay) {
+			
+				// forces the browser to stop loading (note: fails in IE9)
+				htmlMediaElement.src = '';
+				htmlMediaElement.load();
+				htmlMediaElement.canceledPreload = true;
+
+				htmlMediaElement.addEventListener('play',function() {
+					if (htmlMediaElement.canceledPreload) {
+						htmlMediaElement.src = playback.url;
+						htmlMediaElement.load();
+						htmlMediaElement.play();
+						htmlMediaElement.canceledPreload = false;
+					}
+				}, false);
+			// for some reason Chrome forgets how to autoplay sometimes.
+			} else if (autoplay) {
+				htmlMediaElement.load();
+				htmlMediaElement.play();
+			}
+		}
+		*/
+
+		// fire success code
+		options.success(htmlMediaElement, htmlMediaElement);
+		
+		return htmlMediaElement;
+	}
+};
+
+window.mejs = mejs;
+window.MediaElement = mejs.MediaElement;
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