1 /*****************************************************************************
2 * demux.c : Lua playlist demux module
3 *****************************************************************************
4 * Copyright (C) 2007-2008 the VideoLAN team
7 * Authors: Antoine Cellerier <dionoea at videolan tod org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_demux.h>
36 #include <vlc_strings.h>
40 #include "libs/playlist.h"
43 /*****************************************************************************
45 *****************************************************************************/
46 static int Demux( demux_t *p_demux );
47 static int Control( demux_t *p_demux, int i_query, va_list args );
49 /*****************************************************************************
50 * Demux specific functions
51 *****************************************************************************/
58 static int vlclua_demux_peek( lua_State *L )
60 demux_t *p_demux = (demux_t *)vlclua_get_this( L );
61 int n = luaL_checkint( L, 1 );
62 const uint8_t *p_peek;
64 int i_peek = stream_Peek( p_demux->s, &p_peek, n );
66 lua_pushlstring( L, (const char *)p_peek, i_peek );
72 static int vlclua_demux_read( lua_State *L )
74 demux_t *p_demux = (demux_t *)vlclua_get_this( L );
75 const uint8_t *p_read;
76 int n = luaL_checkint( L, 1 );
77 int i_read = stream_Peek( p_demux->s, &p_read, n );
81 lua_pushlstring( L, (const char *)p_read, i_read );
82 int i_seek = stream_Read( p_demux->s, NULL, i_read );
83 assert( i_read == i_seek );
91 static int vlclua_demux_readline( lua_State *L )
93 demux_t *p_demux = (demux_t *)vlclua_get_this( L );
94 char *psz_line = stream_ReadLine( p_demux->s );
97 lua_pushstring( L, psz_line );
107 /*****************************************************************************
109 *****************************************************************************/
110 /* Functions to register */
111 static const luaL_Reg p_reg[] =
113 { "peek", vlclua_demux_peek },
117 /* Functions to register for parse() function call only */
118 static const luaL_Reg p_reg_parse[] =
120 { "read", vlclua_demux_read },
121 { "readline", vlclua_demux_readline },
125 /*****************************************************************************
126 * Called through lua_scripts_batch_execute to call 'probe' on
127 * the script pointed by psz_filename.
128 *****************************************************************************/
129 static int probe_luascript( vlc_object_t *p_this, const char * psz_filename,
132 VLC_UNUSED(user_data);
133 demux_t * p_demux = (demux_t *)p_this;
135 p_demux->p_sys->psz_filename = strdup(psz_filename);
137 /* Initialise Lua state structure */
138 lua_State *L = luaL_newstate();
141 msg_Err( p_demux, "Could not create new Lua State" );
144 p_demux->p_sys->L = L;
146 /* Load Lua libraries */
147 luaL_openlibs( L ); /* FIXME: Don't open all the libs? */
149 vlclua_set_this( L, p_demux );
150 luaL_register( L, "vlc", p_reg );
152 luaopen_strings( L );
154 luaopen_variables( L );
156 lua_pushstring( L, p_demux->psz_location );
157 lua_setfield( L, -2, "path" );
158 lua_pushstring( L, p_demux->psz_access );
159 lua_setfield( L, -2, "access" );
163 /* Setup the module search path */
164 if( vlclua_add_modules_path( p_demux, L, psz_filename ) )
166 msg_Warn( p_demux, "Error while setting the module search path for %s",
171 /* Load and run the script(s) */
172 if( luaL_dofile( L, psz_filename ) )
174 msg_Warn( p_demux, "Error loading script %s: %s", psz_filename,
175 lua_tostring( L, lua_gettop( L ) ) );
179 lua_getglobal( L, "probe" );
181 if( !lua_isfunction( L, -1 ) )
183 msg_Warn( p_demux, "Error while running script %s, "
184 "function probe() not found", psz_filename );
188 if( lua_pcall( L, 0, 1, 0 ) )
190 msg_Warn( p_demux, "Error while running script %s, "
191 "function probe(): %s", psz_filename,
192 lua_tostring( L, lua_gettop( L ) ) );
196 if( lua_gettop( L ) )
198 if( lua_toboolean( L, 1 ) )
200 msg_Dbg( p_demux, "Lua playlist script %s's "
201 "probe() function was successful", psz_filename );
209 lua_close( p_demux->p_sys->L );
210 p_demux->p_sys->L = NULL;
211 FREENULL( p_demux->p_sys->psz_filename );
215 /*****************************************************************************
216 * Import_LuaPlaylist: main import function
217 *****************************************************************************/
218 int Import_LuaPlaylist( vlc_object_t *p_this )
220 demux_t *p_demux = (demux_t *)p_this;
223 p_demux->p_sys = calloc( 1, sizeof( demux_sys_t ) );
224 if( !p_demux->p_sys )
227 p_demux->pf_control = Control;
228 p_demux->pf_demux = Demux;
230 ret = vlclua_scripts_batch_execute( p_this, "playlist",
231 &probe_luascript, NULL );
233 Close_LuaPlaylist( p_this );
238 /*****************************************************************************
239 * Deactivate: frees unused data
240 *****************************************************************************/
241 void Close_LuaPlaylist( vlc_object_t *p_this )
243 demux_t *p_demux = (demux_t *)p_this;
244 if( p_demux->p_sys->L )
245 lua_close( p_demux->p_sys->L );
246 free( p_demux->p_sys->psz_filename );
247 free( p_demux->p_sys );
250 static int Demux( demux_t *p_demux )
252 lua_State *L = p_demux->p_sys->L;
253 char *psz_filename = p_demux->p_sys->psz_filename;
255 input_thread_t *p_input_thread = demux_GetParentInput( p_demux );
256 input_item_t *p_current_input = input_GetItem( p_input_thread );
258 luaL_register( L, "vlc", p_reg_parse );
260 lua_getglobal( L, "parse" );
262 if( !lua_isfunction( L, -1 ) )
264 msg_Warn( p_demux, "Error while running script %s, "
265 "function parse() not found", psz_filename );
266 vlc_object_release( p_input_thread );
270 if( lua_pcall( L, 0, 1, 0 ) )
272 msg_Warn( p_demux, "Error while running script %s, "
273 "function parse(): %s", psz_filename,
274 lua_tostring( L, lua_gettop( L ) ) );
275 vlc_object_release( p_input_thread );
279 if( lua_gettop( L ) )
280 vlclua_playlist_add_internal( p_demux, L, NULL, p_current_input, 0 );
282 msg_Err( p_demux, "Script went completely foobar" );
284 vlc_object_release( p_input_thread );
286 return -1; /* Needed for correct operation of go back */
289 static int Control( demux_t *p_demux, int i_query, va_list args )
291 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);