diff -r 346c88efed21 -r 5e2f62d02dcd wp/wp-includes/js/mediaelement/wp-playlist.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/js/mediaelement/wp-playlist.js	Tue Jun 09 03:35:32 2015 +0200
@@ -0,0 +1,175 @@
+/*globals window, document, jQuery, _, Backbone, _wpmejsSettings */
+
+(function ($, _, Backbone) {
+	"use strict";
+
+	var WPPlaylistView = Backbone.View.extend({
+		initialize : function (options) {
+			this.index = 0;
+			this.settings = {};
+			this.data = options.metadata || $.parseJSON( this.$('script.wp-playlist-script').html() );
+			this.playerNode = this.$( this.data.type );
+
+			this.tracks = new Backbone.Collection( this.data.tracks );
+			this.current = this.tracks.first();
+
+			if ( 'audio' === this.data.type ) {
+				this.currentTemplate = wp.template( 'wp-playlist-current-item' );
+				this.currentNode = this.$( '.wp-playlist-current-item' );
+			}
+
+			this.renderCurrent();
+
+			if ( this.data.tracklist ) {
+				this.itemTemplate = wp.template( 'wp-playlist-item' );
+				this.playingClass = 'wp-playlist-playing';
+				this.renderTracks();
+			}
+
+			this.playerNode.attr( 'src', this.current.get( 'src' ) );
+
+			_.bindAll( this, 'bindPlayer', 'bindResetPlayer', 'setPlayer', 'ended', 'clickTrack' );
+
+			if ( ! _.isUndefined( window._wpmejsSettings ) ) {
+				this.settings = _wpmejsSettings;
+			}
+			this.settings.success = this.bindPlayer;
+			this.setPlayer();
+		},
+
+		bindPlayer : function (mejs) {
+			this.mejs = mejs;
+			this.mejs.addEventListener( 'ended', this.ended );
+		},
+
+		bindResetPlayer : function (mejs) {
+			this.bindPlayer( mejs );
+			this.playCurrentSrc();
+		},
+
+		setPlayer: function (force) {
+			if ( this.player ) {
+				this.player.pause();
+				this.player.remove();
+				this.playerNode = this.$( this.data.type );
+			}
+
+			if (force) {
+				this.playerNode.attr( 'src', this.current.get( 'src' ) );
+				this.settings.success = this.bindResetPlayer;
+			}
+
+			/**
+			 * This is also our bridge to the outside world
+			 */
+			this.player = new MediaElementPlayer( this.playerNode.get(0), this.settings );
+		},
+
+		playCurrentSrc : function () {
+			this.renderCurrent();
+			this.mejs.setSrc( this.playerNode.attr( 'src' ) );
+			this.mejs.load();
+			this.mejs.play();
+		},
+
+		renderCurrent : function () {
+			var dimensions, defaultImage = 'wp-includes/images/media/video.png';
+			if ( 'video' === this.data.type ) {
+				if ( this.data.images && this.current.get( 'image' ) && -1 === this.current.get( 'image' ).src.indexOf( defaultImage ) ) {
+					this.playerNode.attr( 'poster', this.current.get( 'image' ).src );
+				}
+				dimensions = this.current.get( 'dimensions' ).resized;
+				this.playerNode.attr( dimensions );
+			} else {
+				if ( ! this.data.images ) {
+					this.current.set( 'image', false );
+				}
+				this.currentNode.html( this.currentTemplate( this.current.toJSON() ) );
+			}
+		},
+
+		renderTracks : function () {
+			var self = this, i = 1, tracklist = $( '<div class="wp-playlist-tracks"></div>' );
+			this.tracks.each(function (model) {
+				if ( ! self.data.images ) {
+					model.set( 'image', false );
+				}
+				model.set( 'artists', self.data.artists );
+				model.set( 'index', self.data.tracknumbers ? i : false );
+				tracklist.append( self.itemTemplate( model.toJSON() ) );
+				i += 1;
+			});
+			this.$el.append( tracklist );
+
+			this.$( '.wp-playlist-item' ).eq(0).addClass( this.playingClass );
+		},
+
+		events : {
+			'click .wp-playlist-item' : 'clickTrack',
+			'click .wp-playlist-next' : 'next',
+			'click .wp-playlist-prev' : 'prev'
+		},
+
+		clickTrack : function (e) {
+			e.preventDefault();
+
+			this.index = this.$( '.wp-playlist-item' ).index( e.currentTarget );
+			this.setCurrent();
+		},
+
+		ended : function () {
+			if ( this.index + 1 < this.tracks.length ) {
+				this.next();
+			} else {
+				this.index = 0;
+				this.setCurrent();
+			}
+		},
+
+		next : function () {
+			this.index = this.index + 1 >= this.tracks.length ? 0 : this.index + 1;
+			this.setCurrent();
+		},
+
+		prev : function () {
+			this.index = this.index - 1 < 0 ? this.tracks.length - 1 : this.index - 1;
+			this.setCurrent();
+		},
+
+		loadCurrent : function () {
+			var last = this.playerNode.attr( 'src' ) && this.playerNode.attr( 'src' ).split('.').pop(),
+				current = this.current.get( 'src' ).split('.').pop();
+
+			this.mejs && this.mejs.pause();
+
+			if ( last !== current ) {
+				this.setPlayer( true );
+			} else {
+				this.playerNode.attr( 'src', this.current.get( 'src' ) );
+				this.playCurrentSrc();
+			}
+		},
+
+		setCurrent : function () {
+			this.current = this.tracks.at( this.index );
+
+			if ( this.data.tracklist ) {
+				this.$( '.wp-playlist-item' )
+					.removeClass( this.playingClass )
+					.eq( this.index )
+						.addClass( this.playingClass );
+			}
+
+			this.loadCurrent();
+		}
+	});
+
+    $(document).ready(function () {
+		$('.wp-playlist').each( function() {
+			return new WPPlaylistView({ el: this });
+		} );
+    });
+
+	window.WPPlaylistView = WPPlaylistView;
+
+}(jQuery, _, Backbone));
\ No newline at end of file