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>
41 #include "libs/playlist.h"
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Demux( demux_t *p_demux );
48 static int Control( demux_t *p_demux, int i_query, va_list args );
50 /*****************************************************************************
51 * Demux specific functions
52 *****************************************************************************/
59 static int vlclua_demux_peek( lua_State *L )
61 demux_t *p_demux = (demux_t *)vlclua_get_this( L );
62 int n = luaL_checkint( L, 1 );
63 const uint8_t *p_peek;
64 int i_peek = stream_Peek( p_demux->s, &p_peek, n );
65 lua_pushlstring( L, (const char *)p_peek, i_peek );
69 static int vlclua_demux_read( lua_State *L )
71 demux_t *p_demux = (demux_t *)vlclua_get_this( L );
72 const uint8_t *p_read;
73 int n = luaL_checkint( L, 1 );
74 int i_read = stream_Peek( p_demux->s, &p_read, n );
75 lua_pushlstring( L, (const char *)p_read, i_read );
76 int i_seek = stream_Read( p_demux->s, NULL, i_read );
77 assert(i_read==i_seek);
81 static int vlclua_demux_readline( lua_State *L )
83 demux_t *p_demux = (demux_t *)vlclua_get_this( L );
84 char *psz_line = stream_ReadLine( p_demux->s );
87 lua_pushstring( L, psz_line );
97 /*****************************************************************************
99 *****************************************************************************/
100 /* Functions to register */
101 static const luaL_Reg p_reg[] =
103 { "peek", vlclua_demux_peek },
107 /* Functions to register for parse() function call only */
108 static const luaL_Reg p_reg_parse[] =
110 { "read", vlclua_demux_read },
111 { "readline", vlclua_demux_readline },
115 /*****************************************************************************
116 * Called through lua_scripts_batch_execute to call 'probe' on
117 * the script pointed by psz_filename.
118 *****************************************************************************/
119 static int probe_luascript( vlc_object_t *p_this, const char * psz_filename,
120 lua_State * L, void * user_data )
122 VLC_UNUSED(user_data);
123 demux_t * p_demux = (demux_t *)p_this;
125 p_demux->p_sys->psz_filename = strdup(psz_filename);
127 /* In lua, setting a variable's value to nil is equivalent to deleting it */
130 lua_setglobal( L, "probe" );
131 lua_setglobal( L, "parse" );
133 /* Load and run the script(s) */
134 if( luaL_dofile( L, psz_filename ) )
136 msg_Warn( p_demux, "Error loading script %s: %s", psz_filename,
137 lua_tostring( L, lua_gettop( L ) ) );
141 lua_getglobal( L, "probe" );
143 if( !lua_isfunction( L, -1 ) )
145 msg_Warn( p_demux, "Error while runing script %s, "
146 "function probe() not found", psz_filename );
150 if( lua_pcall( L, 0, 1, 0 ) )
152 msg_Warn( p_demux, "Error while runing script %s, "
153 "function probe(): %s", psz_filename,
154 lua_tostring( L, lua_gettop( L ) ) );
158 if( lua_gettop( L ) )
160 if( lua_toboolean( L, 1 ) )
162 msg_Dbg( p_demux, "Lua playlist script %s's "
163 "probe() function was successful", psz_filename );
171 FREENULL( p_demux->p_sys->psz_filename );
175 /*****************************************************************************
176 * Import_LuaPlaylist: main import function
177 *****************************************************************************/
178 int Import_LuaPlaylist( vlc_object_t *p_this )
180 demux_t *p_demux = (demux_t *)p_this;
184 p_demux->p_sys = (demux_sys_t*)malloc( sizeof( demux_sys_t ) );
185 if( !p_demux->p_sys )
190 p_demux->p_sys->psz_filename = NULL;
192 p_demux->pf_control = Control;
193 p_demux->pf_demux = Demux;
195 /* Initialise Lua state structure */
199 msg_Err( p_demux, "Could not create new Lua State" );
200 free( p_demux->p_sys );
203 p_demux->p_sys->L = L;
205 /* Load Lua libraries */
206 luaL_openlibs( L ); /* FIXME: Don't open all the libs? */
208 luaL_register( L, "vlc", p_reg );
210 luaopen_strings( L );
211 lua_pushlightuserdata( L, p_demux );
212 lua_setfield( L, -2, "private" );
213 lua_pushstring( L, p_demux->psz_path );
214 lua_setfield( L, -2, "path" );
215 lua_pushstring( L, p_demux->psz_access );
216 lua_setfield( L, -2, "access" );
220 ret = vlclua_scripts_batch_execute( p_this, "playlist",
221 &probe_luascript, L, NULL );
223 Close_LuaPlaylist( p_this );
228 /*****************************************************************************
229 * Deactivate: frees unused data
230 *****************************************************************************/
231 void Close_LuaPlaylist( vlc_object_t *p_this )
233 demux_t *p_demux = (demux_t *)p_this;
234 lua_close( p_demux->p_sys->L );
235 free( p_demux->p_sys->psz_filename );
236 free( p_demux->p_sys );
239 static int Demux( demux_t *p_demux )
241 lua_State *L = p_demux->p_sys->L;
242 char *psz_filename = p_demux->p_sys->psz_filename;
244 input_thread_t *p_input_thread = demux_GetParentInput( p_demux );
245 input_item_t *p_current_input = input_GetItem( p_input_thread );
246 playlist_t *p_playlist = pl_Hold( p_demux );
248 luaL_register( L, "vlc", p_reg_parse );
250 lua_getglobal( L, "parse" );
252 if( !lua_isfunction( L, -1 ) )
254 msg_Warn( p_demux, "Error while runing script %s, "
255 "function parse() not found", psz_filename );
256 pl_Release( p_demux );
260 if( lua_pcall( L, 0, 1, 0 ) )
262 msg_Warn( p_demux, "Error while runing script %s, "
263 "function parse(): %s", psz_filename,
264 lua_tostring( L, lua_gettop( L ) ) );
265 pl_Release( p_demux );
269 if( lua_gettop( L ) )
270 vlclua_playlist_add_internal( p_demux, L, p_playlist,
271 p_current_input, 0 );
273 msg_Err( p_demux, "Script went completely foobar" );
275 vlc_object_release( p_input_thread );
276 vlclua_release_playlist_internal( p_playlist );
278 return -1; /* Needed for correct operation of go back */
281 static int Control( demux_t *p_demux, int i_query, va_list args )
283 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);