1 /*****************************************************************************
2 * modules_plugin.h : Plugin management functions used by the core application.
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: modules_plugin.h,v 1.19 2002/04/11 08:55:49 sam Exp $
7 * Authors: Samuel Hocevar <sam@zoy.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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
25 * Inline functions for handling dynamic modules
26 *****************************************************************************/
28 /*****************************************************************************
29 * module_load: load a dynamic library
30 *****************************************************************************
31 * This function loads a dynamically linked library using a system dependant
32 * method, and returns a non-zero value on error, zero otherwise.
33 *****************************************************************************/
35 module_load( char * psz_filename, module_handle_t * handle )
38 *handle = load_add_on( psz_filename );
39 return( *handle < 0 );
42 *handle = LoadLibrary( psz_filename );
43 return( *handle == NULL );
45 #elif defined(RTLD_NOW)
46 # if defined(SYS_LINUX)
47 /* We should NOT open modules with RTLD_GLOBAL, or we are going to get
48 * namespace collisions when two modules have common public symbols,
49 * but ALSA is being a pest here. */
50 if( strstr( psz_filename, "alsa.so" ) )
52 *handle = dlopen( psz_filename, RTLD_NOW | RTLD_GLOBAL );
53 return( *handle == NULL );
56 *handle = dlopen( psz_filename, RTLD_NOW );
57 return( *handle == NULL );
60 *handle = dlopen( psz_filename, DL_LAZY );
61 return( *handle == NULL );
66 /*****************************************************************************
67 * module_unload: unload a dynamic library
68 *****************************************************************************
69 * This function unloads a previously opened dynamically linked library
70 * using a system dependant method. No return value is taken in consideration,
71 * since some libraries sometimes refuse to close properly.
72 *****************************************************************************/
73 static __inline__ void
74 module_unload( module_handle_t handle )
77 unload_add_on( handle );
80 FreeLibrary( handle );
89 /*****************************************************************************
90 * module_getsymbol: get a symbol from a dynamic library
91 *****************************************************************************
92 * This function queries a loaded library for a symbol specified in a
93 * string, and returns a pointer to it. We don't check for dlerror() or
94 * similar functions, since we want a non-NULL symbol anyway.
95 *****************************************************************************/
96 static __inline__ void *
97 module_getsymbol_inner( module_handle_t handle, char * psz_function )
101 if( B_OK == get_image_symbol( handle, psz_function,
102 B_SYMBOL_TYPE_TEXT, &p_symbol ) )
112 return( (void *)GetProcAddress( handle, psz_function ) );
115 return( dlsym( handle, psz_function ) );
120 static __inline__ void *
121 module_getsymbol( module_handle_t handle, char * psz_function )
123 void * p_symbol = module_getsymbol_inner( handle, psz_function );
125 /* MacOS X dl library expects symbols to begin with "_". So do
126 * some other operating systems. That's really lame, but hey, what
128 if( p_symbol == NULL )
130 char *psz_call = malloc( strlen( psz_function ) + 2 );
132 strcpy( psz_call + 1, psz_function );
134 p_symbol = module_getsymbol_inner( handle, psz_call );
141 /*****************************************************************************
142 * module_error: wrapper for dlerror()
143 *****************************************************************************
144 * This function returns the error message of the last module operation. It
145 * returns the string "failed" on systems which do not have a dlerror() like
146 * function. psz_buffer can be used to store temporary data, it is guaranteed
147 * to be kept intact until the return value of module_error has been used.
148 *****************************************************************************/
149 static __inline__ const char *
150 module_error( char *psz_buffer )
152 #if defined(SYS_BEOS)
156 int i, i_error = GetLastError();
158 FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
159 NULL, i_error, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
160 (LPTSTR) psz_buffer, 256, NULL);
162 /* Go to the end of the string */
164 psz_buffer[i] && psz_buffer[i] != '\r' && psz_buffer[i] != '\n';
169 snprintf( psz_buffer + i, 256 - i, " (error %i)", i_error );
170 psz_buffer[ 255 ] = '\0';
181 /*****************************************************************************
182 * STORE_SYMBOLS: store known symbols into p_symbols for plugin access.
183 *****************************************************************************/
184 #define STORE_SYMBOLS( p_symbols ) \
185 (p_symbols)->p_main = p_main; \
186 (p_symbols)->p_main_sys = p_main_sys; \
187 (p_symbols)->p_module_bank = p_module_bank; \
188 (p_symbols)->p_input_bank = p_input_bank; \
189 (p_symbols)->p_aout_bank = p_aout_bank; \
190 (p_symbols)->p_vout_bank = p_vout_bank; \
191 (p_symbols)->config_GetIntVariable = config_GetIntVariable; \
192 (p_symbols)->config_GetPszVariable = config_GetPszVariable; \
193 (p_symbols)->config_PutIntVariable = config_PutIntVariable; \
194 (p_symbols)->config_PutPszVariable = config_PutPszVariable; \
195 (p_symbols)->config_LoadConfigFile = config_LoadConfigFile; \
196 (p_symbols)->config_SaveConfigFile = config_SaveConfigFile; \
197 (p_symbols)->config_Duplicate = config_Duplicate; \
198 (p_symbols)->config_FindConfig = config_FindConfig; \
199 (p_symbols)->intf_MsgSub = intf_MsgSub; \
200 (p_symbols)->intf_MsgUnsub = intf_MsgUnsub; \
201 (p_symbols)->intf_Msg = intf_Msg; \
202 (p_symbols)->intf_ErrMsg = intf_ErrMsg; \
203 (p_symbols)->intf_StatMsg = intf_StatMsg;\
204 (p_symbols)->intf_WarnMsg = intf_WarnMsg; \
205 (p_symbols)->intf_PlaylistAdd = intf_PlaylistAdd; \
206 (p_symbols)->intf_PlaylistDelete = intf_PlaylistDelete; \
207 (p_symbols)->intf_PlaylistNext = intf_PlaylistNext; \
208 (p_symbols)->intf_PlaylistPrev = intf_PlaylistPrev; \
209 (p_symbols)->intf_PlaylistDestroy = intf_PlaylistDestroy; \
210 (p_symbols)->intf_PlaylistJumpto = intf_PlaylistJumpto; \
211 (p_symbols)->intf_UrlDecode = intf_UrlDecode; \
212 (p_symbols)->intf_Eject = intf_Eject; \
213 (p_symbols)->msleep = msleep; \
214 (p_symbols)->mdate = mdate; \
215 (p_symbols)->mstrtime = mstrtime; \
216 (p_symbols)->network_ChannelCreate = network_ChannelCreate; \
217 (p_symbols)->network_ChannelJoin = network_ChannelJoin; \
218 (p_symbols)->input_SetProgram = input_SetProgram; \
219 (p_symbols)->input_SetStatus = input_SetStatus; \
220 (p_symbols)->input_Seek = input_Seek; \
221 (p_symbols)->input_DumpStream = input_DumpStream; \
222 (p_symbols)->input_OffsetToTime = input_OffsetToTime; \
223 (p_symbols)->input_ChangeES = input_ChangeES; \
224 (p_symbols)->input_ToggleES = input_ToggleES; \
225 (p_symbols)->input_ChangeProgram = input_ChangeProgram; \
226 (p_symbols)->input_ChangeArea = input_ChangeArea; \
227 (p_symbols)->input_FindES = input_FindES; \
228 (p_symbols)->input_AddES = input_AddES; \
229 (p_symbols)->input_DelES = input_DelES; \
230 (p_symbols)->input_SelectES = input_SelectES; \
231 (p_symbols)->input_UnselectES = input_UnselectES; \
232 (p_symbols)->input_AddProgram = input_AddProgram; \
233 (p_symbols)->input_DelProgram = input_DelProgram; \
234 (p_symbols)->input_AddArea = input_AddArea; \
235 (p_symbols)->input_DelArea = input_DelArea; \
236 (p_symbols)->InitBitstream = InitBitstream; \
237 (p_symbols)->NextDataPacket = NextDataPacket; \
238 (p_symbols)->BitstreamNextDataPacket = BitstreamNextDataPacket; \
239 (p_symbols)->DecoderError = DecoderError; \
240 (p_symbols)->input_InitStream = input_InitStream; \
241 (p_symbols)->input_EndStream = input_EndStream; \
242 (p_symbols)->input_ParsePES = input_ParsePES; \
243 (p_symbols)->input_GatherPES = input_GatherPES; \
244 (p_symbols)->input_DecodePES = input_DecodePES; \
245 (p_symbols)->input_ReadPS = input_ReadPS; \
246 (p_symbols)->input_ParsePS = input_ParsePS; \
247 (p_symbols)->input_DemuxPS = input_DemuxPS; \
248 (p_symbols)->input_ReadTS = input_ReadTS; \
249 (p_symbols)->input_DemuxTS = input_DemuxTS; \
250 (p_symbols)->input_DemuxPSI = input_DemuxPSI; \
251 (p_symbols)->input_ClockManageControl = input_ClockManageControl; \
252 (p_symbols)->input_FDSeek = input_FDSeek; \
253 (p_symbols)->input_FDClose = input_FDClose; \
254 (p_symbols)->input_FDRead = input_FDRead; \
255 (p_symbols)->input_FDNetworkRead = input_FDNetworkRead; \
256 (p_symbols)->input_BuffersInit = input_BuffersInit; \
257 (p_symbols)->input_BuffersEnd = input_BuffersEnd; \
258 (p_symbols)->input_NewBuffer = input_NewBuffer; \
259 (p_symbols)->input_ReleaseBuffer = input_ReleaseBuffer; \
260 (p_symbols)->input_ShareBuffer = input_ShareBuffer; \
261 (p_symbols)->input_NewPacket = input_NewPacket; \
262 (p_symbols)->input_DeletePacket = input_DeletePacket; \
263 (p_symbols)->input_NewPES = input_NewPES; \
264 (p_symbols)->input_DeletePES = input_DeletePES; \
265 (p_symbols)->input_FillBuffer = input_FillBuffer; \
266 (p_symbols)->input_Peek = input_Peek; \
267 (p_symbols)->input_SplitBuffer = input_SplitBuffer; \
268 (p_symbols)->input_AccessInit = input_AccessInit; \
269 (p_symbols)->input_AccessReinit = input_AccessReinit; \
270 (p_symbols)->input_AccessEnd = input_AccessEnd; \
271 (p_symbols)->aout_CreateFifo = aout_CreateFifo; \
272 (p_symbols)->aout_DestroyFifo = aout_DestroyFifo; \
273 (p_symbols)->vout_CreateThread = vout_CreateThread; \
274 (p_symbols)->vout_DestroyThread = vout_DestroyThread; \
275 (p_symbols)->vout_CreateSubPicture = vout_CreateSubPicture; \
276 (p_symbols)->vout_DestroySubPicture = vout_DestroySubPicture; \
277 (p_symbols)->vout_DisplaySubPicture = vout_DisplaySubPicture; \
278 (p_symbols)->vout_CreatePicture = vout_CreatePicture; \
279 (p_symbols)->vout_AllocatePicture = vout_AllocatePicture; \
280 (p_symbols)->vout_DisplayPicture = vout_DisplayPicture; \
281 (p_symbols)->vout_DestroyPicture = vout_DestroyPicture; \
282 (p_symbols)->vout_DatePicture = vout_DatePicture; \
283 (p_symbols)->vout_LinkPicture = vout_LinkPicture; \
284 (p_symbols)->vout_UnlinkPicture = vout_UnlinkPicture; \
285 (p_symbols)->vout_PlacePicture = vout_PlacePicture; \
286 (p_symbols)->UnalignedGetBits = UnalignedGetBits; \
287 (p_symbols)->UnalignedRemoveBits = UnalignedRemoveBits; \
288 (p_symbols)->UnalignedShowBits = UnalignedShowBits; \
289 (p_symbols)->CurrentPTS = CurrentPTS; \
290 (p_symbols)->DecodeLanguage = DecodeLanguage; \
291 (p_symbols)->module_Need = module_Need; \
292 (p_symbols)->module_Unneed = module_Unneed;