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>
37 #include <vlc_charset.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
45 #include "libs/playlist.h"
48 /*****************************************************************************
50 *****************************************************************************/
51 static int Demux( demux_t *p_demux );
52 static int Control( demux_t *p_demux, int i_query, va_list args );
54 /*****************************************************************************
55 * Demux specific functions
56 *****************************************************************************/
63 static int vlclua_demux_peek( lua_State *L )
65 demux_t *p_demux = (demux_t *)vlclua_get_this( L );
66 int n = luaL_checkint( L, 1 );
67 const uint8_t *p_peek;
68 int i_peek = stream_Peek( p_demux->s, &p_peek, n );
69 lua_pushlstring( L, (const char *)p_peek, i_peek );
73 static int vlclua_demux_read( lua_State *L )
75 demux_t *p_demux = (demux_t *)vlclua_get_this( L );
76 const uint8_t *p_read;
77 int n = luaL_checkint( L, 1 );
78 int i_read = stream_Peek( p_demux->s, &p_read, n );
79 lua_pushlstring( L, (const char *)p_read, i_read );
80 int i_seek = stream_Read( p_demux->s, NULL, i_read );
81 assert(i_read==i_seek);
85 static int vlclua_demux_readline( lua_State *L )
87 demux_t *p_demux = (demux_t *)vlclua_get_this( L );
88 char *psz_line = stream_ReadLine( p_demux->s );
91 lua_pushstring( L, psz_line );
101 /*****************************************************************************
103 *****************************************************************************/
104 /* Functions to register */
105 static const luaL_Reg p_reg[] =
107 { "peek", vlclua_demux_peek },
111 /* Functions to register for parse() function call only */
112 static const luaL_Reg p_reg_parse[] =
114 { "read", vlclua_demux_read },
115 { "readline", vlclua_demux_readline },
119 /*****************************************************************************
120 * Called through lua_scripts_batch_execute to call 'probe' on
121 * the script pointed by psz_filename.
122 *****************************************************************************/
123 static int probe_luascript( vlc_object_t *p_this, const char * psz_filename,
124 lua_State * L, void * user_data )
126 VLC_UNUSED(user_data);
127 demux_t * p_demux = (demux_t *)p_this;
129 p_demux->p_sys->psz_filename = strdup(psz_filename);
131 /* In lua, setting a variable's value to nil is equivalent to deleting it */
134 lua_setglobal( L, "probe" );
135 lua_setglobal( L, "parse" );
137 /* Load and run the script(s) */
138 if( luaL_dofile( L, psz_filename ) )
140 msg_Warn( p_demux, "Error loading script %s: %s", psz_filename,
141 lua_tostring( L, lua_gettop( L ) ) );
145 lua_getglobal( L, "probe" );
147 if( !lua_isfunction( L, -1 ) )
149 msg_Warn( p_demux, "Error while runing script %s, "
150 "function probe() not found", psz_filename );
154 if( lua_pcall( L, 0, 1, 0 ) )
156 msg_Warn( p_demux, "Error while runing script %s, "
157 "function probe(): %s", psz_filename,
158 lua_tostring( L, lua_gettop( L ) ) );
162 if( lua_gettop( L ) )
164 if( lua_toboolean( L, 1 ) )
166 msg_Dbg( p_demux, "Lua playlist script %s's "
167 "probe() function was successful", psz_filename );
175 FREENULL( p_demux->p_sys->psz_filename );
179 /*****************************************************************************
180 * Import_LuaPlaylist: main import function
181 *****************************************************************************/
182 int Import_LuaPlaylist( vlc_object_t *p_this )
184 demux_t *p_demux = (demux_t *)p_this;
188 p_demux->p_sys = (demux_sys_t*)malloc( sizeof( demux_sys_t ) );
189 if( !p_demux->p_sys )
194 p_demux->p_sys->psz_filename = NULL;
196 p_demux->pf_control = Control;
197 p_demux->pf_demux = Demux;
199 /* Initialise Lua state structure */
203 msg_Err( p_demux, "Could not create new Lua State" );
204 free( p_demux->p_sys );
207 p_demux->p_sys->L = L;
209 /* Load Lua libraries */
210 luaL_openlibs( L ); /* FIXME: Don't open all the libs? */
212 luaL_register( L, "vlc", p_reg );
214 luaopen_strings( L );
215 lua_pushlightuserdata( L, p_demux );
216 lua_setfield( L, -2, "private" );
217 lua_pushstring( L, p_demux->psz_path );
218 lua_setfield( L, -2, "path" );
219 lua_pushstring( L, p_demux->psz_access );
220 lua_setfield( L, -2, "access" );
224 ret = vlclua_scripts_batch_execute( p_this, "playlist",
225 &probe_luascript, L, NULL );
227 Close_LuaPlaylist( p_this );
232 /*****************************************************************************
233 * Deactivate: frees unused data
234 *****************************************************************************/
235 void Close_LuaPlaylist( vlc_object_t *p_this )
237 demux_t *p_demux = (demux_t *)p_this;
238 lua_close( p_demux->p_sys->L );
239 free( p_demux->p_sys->psz_filename );
240 free( p_demux->p_sys );
243 static int Demux( demux_t *p_demux )
245 lua_State *L = p_demux->p_sys->L;
246 char *psz_filename = p_demux->p_sys->psz_filename;
248 input_thread_t *p_input_thread = demux_GetParentInput( p_demux );
249 input_item_t *p_current_input = input_GetItem( p_input_thread );
250 playlist_t *p_playlist = pl_Hold( p_demux );
252 luaL_register( L, "vlc", p_reg_parse );
254 lua_getglobal( L, "parse" );
256 if( !lua_isfunction( L, -1 ) )
258 msg_Warn( p_demux, "Error while runing script %s, "
259 "function parse() not found", psz_filename );
260 pl_Release( p_demux );
264 if( lua_pcall( L, 0, 1, 0 ) )
266 msg_Warn( p_demux, "Error while runing script %s, "
267 "function parse(): %s", psz_filename,
268 lua_tostring( L, lua_gettop( L ) ) );
269 pl_Release( p_demux );
273 if( lua_gettop( L ) )
274 vlclua_playlist_add_internal( p_demux, L, p_playlist,
275 p_current_input, 0 );
277 msg_Err( p_demux, "Script went completely foobar" );
279 vlc_object_release( p_input_thread );
280 vlclua_release_playlist_internal( p_playlist );
282 return -1; /* Needed for correct operation of go back */
285 static int Control( demux_t *p_demux, int i_query, va_list args )
287 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);