Add a lua sd for librivox.

This SD is really simple for the moment, It can be improve to ease the
navigation through the different books.

share/lua/sd/librivox.lua

+--[[
+ $Id$
+
+ Copyright © 2010 VideoLAN and AUTHORS
+
+ Authors: Rémi Duraffort  <ivoire at videolan dot org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+--]]
+
+require "simplexml"
+
+function descriptor()
+    return { title = 'librivox' }
+end
+
+function string_2_duration(str)
+    local index = string.find( str, ':' )
+    if( index == nil ) then return str
+    else
+        local index2 = string.find( str, ':', index + 1 )
+        if( index2 == nil ) then
+            return string.sub( str, 0, index - 1 ) * 60 + string.sub( str, index + 1 )
+        else
+            return string.sub( str, 0, index - 1 ) * 3600 + string.sub( str, index + 1, index2 - 1 ) * 60 + string.sub( str, index2 + 1 )
+        end
+    end
+end
+
+function main()
+    local podcast = simplexml.parse_url( 'http://librivox.org/podcast.xml' )
+
+    simplexml.add_name_maps( podcast )
+    local channel = podcast.children_map['channel'][1]
+    local arturl = ''
+
+    for _, item in ipairs( channel.children ) do
+        if( item.name == 'item' )
+        then
+            simplexml.add_name_maps( item )
+            local new_item = vlc.sd.add_item( { path = item.children_map['link'][1].children[1],
+                                                title = item.children_map['title'][1].children[1],
+                                                album = item.children_map['itunes:subtitle'][1].children[1],
+                                                duration = string_2_duration( item.children_map['itunes:duration'][1].children[1] ),
+                                                arturl = arturl } )
+        elseif( item.name == 'itunes:image' )
+        then
+            arturl = item.attributes['href']
+        end
+    end
+end
+