1 /*****************************************************************************
2 * meta.c: Get meta/artwork using lua scripts
3 *****************************************************************************
4 * Copyright (C) 2007-2008 the VideoLAN team
7 * Authors: Antoine Cellerier <dionoea at videolan tod org>
8 * Pierre d'Herbemont <pdherbemont # videolan.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
36 #include <vlc_common.h>
37 #include <vlc_input.h>
38 #include <vlc_playlist.h>
40 #include <vlc_demux.h>
41 #include <vlc_art_finder.h>
43 #include <vlc_strings.h>
44 #include <vlc_stream.h>
45 #include <vlc_charset.h>
50 /*****************************************************************************
52 *****************************************************************************/
53 static const luaL_Reg p_reg[] = { { NULL, NULL } };
55 static lua_State * init( vlc_object_t *p_this, input_item_t * p_item )
57 lua_State * L = luaL_newstate();
60 msg_Err( p_this, "Could not create new Lua State" );
64 /* Load Lua libraries */
65 luaL_openlibs( L ); /* XXX: Don't open all the libs? */
67 luaL_register( L, "vlc", p_reg );
72 luaopen_variables( L );
75 luaopen_input_item( L, p_item );
77 lua_pushlightuserdata( L, p_this );
78 lua_setfield( L, -2, "private" );
83 /*****************************************************************************
84 * Run a lua entry point function
85 *****************************************************************************/
86 static int run( vlc_object_t *p_this, const char * psz_filename,
87 lua_State * L, const char *luafunction )
89 /* Ugly hack to delete previous versions of the fetchart()
92 lua_setglobal( L, luafunction );
94 /* Load and run the script(s) */
95 if( luaL_dofile( L, psz_filename ) )
97 msg_Warn( p_this, "Error loading script %s: %s", psz_filename,
98 lua_tostring( L, lua_gettop( L ) ) );
102 lua_getglobal( L, luafunction );
104 if( !lua_isfunction( L, lua_gettop( L ) ) )
106 msg_Warn( p_this, "Error while runing script %s, "
107 "function %s() not found", psz_filename, luafunction );
111 if( lua_pcall( L, 0, 1, 0 ) )
113 msg_Warn( p_this, "Error while runing script %s, "
114 "function %s(): %s", psz_filename, luafunction,
115 lua_tostring( L, lua_gettop( L ) ) );
125 /*****************************************************************************
126 * Called through lua_scripts_batch_execute to call 'fetch_art' on the script
127 * pointed by psz_filename.
128 *****************************************************************************/
129 static int fetch_art( vlc_object_t *p_this, const char * psz_filename,
130 lua_State * L, void * user_data )
132 input_item_t * p_input = user_data;
135 int i_ret = run(p_this, psz_filename, L, "fetch_art");
136 if(i_ret != VLC_SUCCESS)
139 if((s = lua_gettop( L )))
141 const char * psz_value;
143 if( lua_isstring( L, s ) )
145 psz_value = lua_tostring( L, s );
146 if( psz_value && *psz_value != 0 )
148 lua_Dbg( p_this, "setting arturl: %s", psz_value );
149 input_item_SetArtURL ( p_input, psz_value );
153 else if( !lua_isnil( L, s ) )
155 msg_Err( p_this, "Lua art fetcher script %s: "
156 "didn't return a string", psz_filename );
161 msg_Err( p_this, "Script went completely foobar" );
167 /*****************************************************************************
168 * Called through lua_scripts_batch_execute to call 'fetch_art' on the script
169 * pointed by psz_filename.
170 *****************************************************************************/
171 static int read_meta( vlc_object_t *p_this, const char * psz_filename,
172 lua_State * L, void * user_data )
174 VLC_UNUSED(user_data);
176 int i_ret = run(p_this, psz_filename, L, "read_meta");
177 if(i_ret != VLC_SUCCESS)
180 // Continue, all "meta reader" are always run.
184 /*****************************************************************************
186 *****************************************************************************/
188 int ReadMeta( vlc_object_t *p_this )
190 demux_meta_t *p_demux_meta = (demux_meta_t *)p_this;
191 input_item_t *p_item = p_demux_meta->p_item;
193 lua_State *L = init( p_this, p_item );
194 int i_ret = vlclua_scripts_batch_execute( p_this, "meta/reader", &read_meta, L, NULL );
200 /*****************************************************************************
201 * Module entry point for art.
202 *****************************************************************************/
203 int FindArt( vlc_object_t *p_this )
205 art_finder_t *p_finder = (art_finder_t *)p_this;
206 input_item_t *p_item = p_finder->p_item;
207 playlist_t *p_playlist = pl_Hold( p_this );
211 lua_State *L = init( p_this, p_item );
212 int i_ret = vlclua_scripts_batch_execute( p_this, "meta/art", &fetch_art, L, p_item );
215 pl_Release( p_this );