Media: Introduce a custom error handler for MediaElement.js to display a download link if a FLV file cannot be rendered for any reason.

Props Clorith.
Merges [42582] to the 4.9 branch.
Fixes #42643.
Built from https://develop.svn.wordpress.org/branches/4.9@42583


git-svn-id: http://core.svn.wordpress.org/branches/4.9@42412 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/mediaelement/wp-mediaelement.js

@@ -1,4 +1,4 @@
-/* global _wpmejsSettings */
+/* global _wpmejsSettings, mejsL10n */
 (function( window, $ ) {
 
 	window.wp = window.wp || {};
@@ -42,6 +42,25 @@
 				}
 			};
 
+			/**
+			 * Custom error handler.
+			 *
+			 * Sets up a custom error handler in case a video render fails, and provides a download
+			 * link as the fallback.
+			 *
+			 * @since 4.9.3
+			 *
+			 * @param {object} media The wrapper that mimics all the native events/properties/methods for all renderers.
+			 * @param {object} node  The original HTML video, audio, or iframe tag where the media was loaded.
+			 * @returns {string}
+			 */
+			settings.customError = function ( media, node ) {
+				// Make sure we only fall back to a download link for flash files.
+				if ( -1 !== media.rendererName.indexOf( 'flash' ) || -1 !== media.rendererName.indexOf( 'flv' ) ) {
+					return '<a href="' + node.src + '">' + mejsL10n.strings['mejs.download-video'] + '</a>';
+				}
+			};
+
 			// Only initialize new media elements.
 			$( '.wp-audio-shortcode, .wp-video-shortcode' )
 				.not( '.mejs-container' )

wp-includes/js/mediaelement/wp-mediaelement.min.js

@@ -1 +1 @@
-!function(a,b){function c(){function a(){"undefined"!=typeof _wpmejsSettings&&(c=b.extend(!0,{},_wpmejsSettings)),c.classPrefix="mejs-",c.success=c.success||function(a){var b,c;a.rendererName&&-1!==a.rendererName.indexOf("flash")&&(b=a.attributes.autoplay&&"false"!==a.attributes.autoplay,c=a.attributes.loop&&"false"!==a.attributes.loop,b&&a.addEventListener("canplay",function(){a.play()},!1),c&&a.addEventListener("ended",function(){a.play()},!1))},b(".wp-audio-shortcode, .wp-video-shortcode").not(".mejs-container").filter(function(){return!b(this).parent().hasClass("mejs-mediaelement")}).mediaelementplayer(c)}var c={};return{initialize:a}}a.wp=a.wp||{},a.wp.mediaelement=new c,b(a.wp.mediaelement.initialize)}(window,jQuery);
+!function(a,b){function c(){function a(){"undefined"!=typeof _wpmejsSettings&&(c=b.extend(!0,{},_wpmejsSettings)),c.classPrefix="mejs-",c.success=c.success||function(a){var b,c;a.rendererName&&-1!==a.rendererName.indexOf("flash")&&(b=a.attributes.autoplay&&"false"!==a.attributes.autoplay,c=a.attributes.loop&&"false"!==a.attributes.loop,b&&a.addEventListener("canplay",function(){a.play()},!1),c&&a.addEventListener("ended",function(){a.play()},!1))},c.customError=function(a,b){if(-1!==a.rendererName.indexOf("flash")||-1!==a.rendererName.indexOf("flv"))return'<a href="'+b.src+'">'+mejsL10n.strings["mejs.download-video"]+"</a>"},b(".wp-audio-shortcode, .wp-video-shortcode").not(".mejs-container").filter(function(){return!b(this).parent().hasClass("mejs-mediaelement")}).mediaelementplayer(c)}var c={};return{initialize:a}}a.wp=a.wp||{},a.wp.mediaelement=new c,b(a.wp.mediaelement.initialize)}(window,jQuery);

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9.3-alpha-42580';
+$wp_version = '4.9.3-alpha-42583';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.