1 /*****************************************************************************
2 * modules.c : Builtin and plugin modules management functions
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: modules.c,v 1.138 2003/11/05 17:57:29 gbazin Exp $
7 * Authors: Sam Hocevar <sam@zoy.org>
8 * Ethan C. Baldridge <BaldridgeE@cadmus.com>
9 * Hans-Peter Jansen <hpj@urpla.net>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /* Some faulty libcs have a broken struct dirent when _FILE_OFFSET_BITS
27 * is set to 64. Don't try to be cleverer. */
28 #ifdef _FILE_OFFSET_BITS
29 #undef _FILE_OFFSET_BITS
32 #include <stdlib.h> /* free(), strtol() */
33 #include <stdio.h> /* sprintf() */
34 #include <string.h> /* strdup() */
40 #elif defined( UNDER_CE )
41 # include <windows.h> /* GetFileAttributes() */
43 # include "../extras/dirent.h"
46 #ifdef HAVE_SYS_TYPES_H
47 # include <sys/types.h>
49 #ifdef HAVE_SYS_STAT_H
50 # include <sys/stat.h>
56 #define HAVE_DYNAMIC_PLUGINS
57 #if defined(HAVE_DL_DYLD)
58 # if defined(HAVE_MACH_O_DYLD_H)
59 # include <mach-o/dyld.h>
61 #elif defined(HAVE_DL_BEOS)
62 # if defined(HAVE_IMAGE_H)
65 #elif defined(HAVE_DL_WINDOWS)
67 #elif defined(HAVE_DL_DLOPEN)
68 # if defined(HAVE_DLFCN_H) /* Linux, BSD, Hurd */
71 # if defined(HAVE_SYS_DL_H)
74 #elif defined(HAVE_DL_SHL_LOAD)
75 # if defined(HAVE_DL_H)
79 # undef HAVE_DYNAMIC_PLUGINS
82 #include "vlc_error.h"
84 #include "vlc_interface.h"
85 #include "vlc_playlist.h"
86 #include "intf_eject.h"
88 #include "stream_control.h"
89 #include "input_ext-intf.h"
90 #include "input_ext-dec.h"
91 #include "input_ext-plugins.h"
94 #include "vlc_video.h"
95 #include "video_output.h"
96 #include "vout_synchro.h"
98 #include "audio_output.h"
99 #include "aout_internal.h"
101 #include "stream_output.h"
102 /*#include "announce.h"*/
105 #include "iso_lang.h"
108 #include "vlc_block.h"
110 #if defined( UNDER_CE )
111 # define MYCHAR wchar_t
116 #ifdef HAVE_DYNAMIC_PLUGINS
117 # include "modules_plugin.h"
120 #if defined( UNDER_CE )
121 # include "modules_builtin_evc.h"
122 #elif defined( _MSC_VER )
123 # include "modules_builtin_msvc.h"
125 # include "modules_builtin.h"
128 /*****************************************************************************
130 *****************************************************************************/
131 #ifdef HAVE_DYNAMIC_PLUGINS
132 static void AllocateAllPlugins ( vlc_object_t * );
133 static void AllocatePluginDir ( vlc_object_t *, const MYCHAR *, int );
134 static int AllocatePluginFile ( vlc_object_t *, MYCHAR * );
136 static int AllocateBuiltinModule( vlc_object_t *, int ( * ) ( module_t * ) );
137 static int DeleteModule ( module_t * );
138 #ifdef HAVE_DYNAMIC_PLUGINS
139 static void DupModule ( module_t * );
140 static void UndupModule ( module_t * );
141 static int CallEntry ( module_t * );
142 static void CloseModule ( module_handle_t );
143 static void * GetSymbol ( module_handle_t, const char * );
144 #if defined(HAVE_DL_WINDOWS)
145 static char * GetWindowsError ( void );
149 /*****************************************************************************
150 * module_InitBank: create the module bank.
151 *****************************************************************************
152 * This function creates a module bank structure which will be filled later
153 * on with all the modules found.
154 *****************************************************************************/
155 void __module_InitBank( vlc_object_t *p_this )
157 module_bank_t *p_bank;
159 p_bank = vlc_object_create( p_this, sizeof(module_bank_t) );
160 p_bank->psz_object_name = "module bank";
163 * Store the symbols to be exported
165 #ifdef HAVE_DYNAMIC_PLUGINS
166 STORE_SYMBOLS( &p_bank->symbols );
169 /* Everything worked, attach the object */
170 p_this->p_libvlc->p_module_bank = p_bank;
171 vlc_object_attach( p_bank, p_this->p_libvlc );
176 /*****************************************************************************
177 * module_ResetBank: reset the module bank.
178 *****************************************************************************
179 * This function resets the module bank by unloading all unused plugin
181 *****************************************************************************/
182 void __module_ResetBank( vlc_object_t *p_this )
184 msg_Err( p_this, "FIXME: module_ResetBank unimplemented" );
188 /*****************************************************************************
189 * module_EndBank: empty the module bank.
190 *****************************************************************************
191 * This function unloads all unused plugin modules and empties the module
192 * bank in case of success.
193 *****************************************************************************/
194 void __module_EndBank( vlc_object_t *p_this )
198 vlc_object_detach( p_this->p_libvlc->p_module_bank );
200 while( p_this->p_libvlc->p_module_bank->i_children )
202 p_next = (module_t *)p_this->p_libvlc->p_module_bank->pp_children[0];
204 if( DeleteModule( p_next ) )
206 /* Module deletion failed */
207 msg_Err( p_this, "module \"%s\" can't be removed, trying harder",
208 p_next->psz_object_name );
210 /* We just free the module by hand. Niahahahahaha. */
211 vlc_object_detach( p_next );
212 vlc_object_destroy( p_next );
216 vlc_object_destroy( p_this->p_libvlc->p_module_bank );
221 /*****************************************************************************
222 * module_LoadMain: load the main program info into the module bank.
223 *****************************************************************************
224 * This function fills the module bank structure with the main module infos.
225 * This is very useful as it will allow us to consider the main program just
226 * as another module, and for instance the configuration options of main will
227 * be available in the module bank structure just as for every other module.
228 *****************************************************************************/
229 void __module_LoadMain( vlc_object_t *p_this )
231 AllocateBuiltinModule( p_this, vlc_entry__main );
234 /*****************************************************************************
235 * module_LoadBuiltins: load all modules which we built with.
236 *****************************************************************************
237 * This function fills the module bank structure with the builtin modules.
238 *****************************************************************************/
239 void __module_LoadBuiltins( vlc_object_t * p_this )
241 msg_Dbg( p_this, "checking builtin modules" );
242 ALLOCATE_ALL_BUILTINS();
245 /*****************************************************************************
246 * module_LoadPlugins: load all plugin modules we can find.
247 *****************************************************************************
248 * This function fills the module bank structure with the plugin modules.
249 *****************************************************************************/
250 void __module_LoadPlugins( vlc_object_t * p_this )
252 #ifdef HAVE_DYNAMIC_PLUGINS
253 msg_Dbg( p_this, "checking plugin modules" );
254 AllocateAllPlugins( p_this );
258 /*****************************************************************************
259 * module_Need: return the best module function, given a capability list.
260 *****************************************************************************
261 * This function returns the module that best fits the asked capabilities.
262 *****************************************************************************/
263 module_t * __module_Need( vlc_object_t *p_this, const char *psz_capability,
264 const char *psz_name )
266 typedef struct module_list_t module_list_t;
272 module_list_t *p_next;
275 module_list_t *p_list, *p_first, *p_tmp;
278 int i_which_module, i_index = 0;
279 vlc_bool_t b_intf = VLC_FALSE;
284 char *psz_shortcuts = NULL, *psz_var = NULL;
286 msg_Dbg( p_this, "looking for %s module", psz_capability );
288 /* Deal with variables */
289 if( psz_name && psz_name[0] == '$' )
292 var_Create( p_this, psz_name + 1, VLC_VAR_MODULE | VLC_VAR_DOINHERIT );
293 var_Get( p_this, psz_name + 1, &val );
294 psz_var = val.psz_string;
298 /* Count how many different shortcuts were asked for */
299 if( psz_name && *psz_name )
303 /* If the user wants none, give him none. */
304 if( !strcmp( psz_name, "none" ) )
306 if( psz_var ) free( psz_var );
311 psz_shortcuts = strdup( psz_name );
313 for( psz_parser = psz_shortcuts; *psz_parser; psz_parser++ )
315 if( *psz_parser == ',' )
323 /* Sort the modules and test them */
324 p_all = vlc_list_find( p_this, VLC_OBJECT_MODULE, FIND_ANYWHERE );
325 p_list = malloc( p_all->i_count * sizeof( module_list_t ) );
328 /* Parse the module list for capabilities and probe each of them */
329 for( i_which_module = 0; i_which_module < p_all->i_count; i_which_module++ )
331 module_t * p_submodule = NULL;
332 int i_shortcut_bonus = 0, i_submodule;
334 p_module = (module_t *)p_all->p_values[i_which_module].p_object;
336 /* Test that this module can do what we need */
337 if( strcmp( p_module->psz_capability, psz_capability ) )
339 for( i_submodule = 0;
340 i_submodule < p_module->i_children;
343 if( !strcmp( ((module_t*)p_module->pp_children[ i_submodule ])
344 ->psz_capability, psz_capability ) )
347 (module_t*)p_module->pp_children[ i_submodule ];
352 if( p_submodule == NULL )
357 p_module = p_submodule;
360 /* Test if we have the required CPU */
361 if( (p_module->i_cpu & p_this->p_libvlc->i_cpu) != p_module->i_cpu )
366 /* If we required a shortcut, check this plugin provides it. */
370 int i_dummy, i_short = i_shortcuts;
371 char *psz_name = psz_shortcuts;
373 /* Let's drop modules with a 0 score (unless they are
374 * explicitly requested) */
375 b_trash = !p_module->i_score;
379 /* If the last given shortcut is "none" and we couldn't
380 * find the module in the list of provided shortcuts,
381 * then kick the bastard out of here!!! */
382 if( (i_short == 1) && !strcmp(psz_name, "none") )
388 for( i_dummy = 0; p_module->pp_shortcuts[i_dummy]; i_dummy++ )
390 if( !strcasecmp( psz_name,
391 p_module->pp_shortcuts[i_dummy] ) )
395 i_shortcut_bonus = i_short * 10000;
400 if( i_shortcut_bonus )
402 /* We found it... remember ? */
406 /* Go to the next shortcut... This is so lame! */
420 /* If we didn't require a shortcut, trash zero-scored plugins */
421 else if( !p_module->i_score )
426 /* Special case: test if we requested a particular intf plugin */
427 if( !i_shortcuts && p_module->psz_program
428 && !strcmp( p_module->psz_program,
429 p_this->p_vlc->psz_object_name ) )
433 /* Remove previous non-matching plugins */
440 /* This one doesn't match */
444 /* Store this new module */
445 p_list[ i_index ].p_module = p_module;
446 p_list[ i_index ].i_score = p_module->i_score + i_shortcut_bonus;
448 /* Add it to the modules-to-probe list */
451 p_list[ 0 ].p_next = NULL;
456 /* Ok, so at school you learned that quicksort is quick, and
457 * bubble sort sucks raw eggs. But that's when dealing with
458 * thousands of items. Here we have barely 50. */
459 module_list_t *p_newlist = p_first;
461 if( p_first->i_score < p_list[ i_index ].i_score )
463 p_list[ i_index ].p_next = p_first;
464 p_first = &p_list[ i_index ];
468 while( p_newlist->p_next != NULL &&
469 p_newlist->p_next->i_score >= p_list[ i_index ].i_score )
471 p_newlist = p_newlist->p_next;
474 p_list[ i_index ].p_next = p_newlist->p_next;
475 p_newlist->p_next = &p_list[ i_index ];
482 msg_Dbg( p_this, "probing %i candidate%s",
483 i_index, i_index == 1 ? "" : "s" );
485 /* Lock all candidate modules */
487 while( p_tmp != NULL )
489 vlc_object_yield( p_tmp->p_module );
490 p_tmp = p_tmp->p_next;
493 /* We can release the list, interesting modules were yielded */
494 vlc_list_release( p_all );
496 /* Parse the linked list and use the first successful module */
498 while( p_tmp != NULL )
500 if( p_tmp->p_module->pf_activate
501 && p_tmp->p_module->pf_activate( p_this ) == VLC_SUCCESS )
506 vlc_object_release( p_tmp->p_module );
507 p_tmp = p_tmp->p_next;
510 /* Store the locked module value */
513 p_module = p_tmp->p_module;
514 p_tmp = p_tmp->p_next;
521 /* Unlock the remaining modules */
522 while( p_tmp != NULL )
524 vlc_object_release( p_tmp->p_module );
525 p_tmp = p_tmp->p_next;
530 if( p_module != NULL )
532 msg_Dbg( p_module, "using %s module \"%s\"",
533 psz_capability, p_module->psz_object_name );
535 else if( p_first == NULL )
537 msg_Err( p_this, "no %s module matched \"%s\"",
538 psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
540 else if( psz_name != NULL && *psz_name )
542 msg_Warn( p_this, "no %s module matching \"%s\" could be loaded",
543 psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
548 free( psz_shortcuts );
556 /* Don't forget that the module is still locked */
560 /*****************************************************************************
561 * module_Unneed: decrease the usage count of a module.
562 *****************************************************************************
563 * This function must be called by the thread that called module_Need, to
564 * decrease the reference count and allow for hiding of modules.
565 *****************************************************************************/
566 void __module_Unneed( vlc_object_t * p_this, module_t * p_module )
568 /* Use the close method */
569 if( p_module->pf_deactivate )
571 p_module->pf_deactivate( p_this );
574 msg_Dbg( p_module, "unlocking module \"%s\"", p_module->psz_object_name );
576 vlc_object_release( p_module );
581 /*****************************************************************************
582 * Following functions are local.
583 *****************************************************************************/
585 /*****************************************************************************
586 * AllocateAllPlugins: load all plugin modules we can find.
587 *****************************************************************************/
588 #ifdef HAVE_DYNAMIC_PLUGINS
589 static void AllocateAllPlugins( vlc_object_t *p_this )
591 /* Yes, there are two NULLs because we replace one with "plugin-path". */
592 char * path[] = { "modules", PLUGIN_PATH, "plugins", NULL,
595 char ** ppsz_path = path;
598 #if defined( UNDER_CE )
599 wchar_t psz_dir[MAX_PATH];
602 /* If the user provided a plugin path, we add it to the list */
603 path[ sizeof(path)/sizeof(char*) - 2 ] = config_GetPsz( p_this,
606 for( ; *ppsz_path != NULL ; ppsz_path++ )
608 #if defined( SYS_BEOS ) || defined( SYS_DARWIN ) \
609 || ( defined( WIN32 ) && !defined( UNDER_CE ) )
611 /* Handle relative as well as absolute paths */
613 if( !(*ppsz_path)[0] || (*ppsz_path)[1] != ':' )
615 if( (*ppsz_path)[0] != '/' )
618 int i_dirlen = strlen( *ppsz_path );
619 i_dirlen += strlen( p_this->p_libvlc->psz_vlcpath ) + 2;
621 psz_fullpath = malloc( i_dirlen );
622 if( psz_fullpath == NULL )
627 sprintf( psz_fullpath, "%s\\%s",
628 p_this->p_libvlc->psz_vlcpath, *ppsz_path );
630 sprintf( psz_fullpath, "%s/%s",
631 p_this->p_libvlc->psz_vlcpath, *ppsz_path );
637 psz_fullpath = strdup( *ppsz_path );
640 msg_Dbg( p_this, "recursively browsing `%s'", psz_fullpath );
642 /* Don't go deeper than 5 subdirectories */
643 #if defined( UNDER_CE )
644 MultiByteToWideChar( CP_ACP, 0, psz_fullpath, -1, psz_dir, MAX_PATH );
645 AllocatePluginDir( p_this, psz_dir, 5 );
647 AllocatePluginDir( p_this, psz_fullpath, 5 );
650 free( psz_fullpath );
653 /* Free plugin-path */
654 if( path[ sizeof(path)/sizeof(char*) - 2 ] )
655 free( path[ sizeof(path)/sizeof(char*) - 2 ] );
656 path[ sizeof(path)/sizeof(char*) - 2 ] = NULL;
659 /*****************************************************************************
660 * AllocatePluginDir: recursively parse a directory to look for plugins
661 *****************************************************************************/
662 static void AllocatePluginDir( vlc_object_t *p_this, const MYCHAR *psz_dir,
665 #if defined( UNDER_CE ) || defined( _MSC_VER )
667 MYCHAR psz_path[MAX_PATH + 256];
669 char psz_path[MAX_PATH + 256];
671 WIN32_FIND_DATA finddata;
678 struct dirent * file;
686 #if defined( UNDER_CE ) || defined( _MSC_VER )
687 rc = GetFileAttributes( psz_dir );
688 if( !(rc & FILE_ATTRIBUTE_DIRECTORY) )
690 /* Not a directory */
694 /* Parse all files in the directory */
696 swprintf( psz_path, L"%s\\*.*", psz_dir );
698 sprintf( psz_path, "%s\\*.*", psz_dir );
700 handle = FindFirstFile( psz_path, &finddata );
701 if( handle == INVALID_HANDLE_VALUE )
703 /* Empty directory */
707 /* Parse the directory and try to load all files it contains. */
711 unsigned int i_len = wcslen( finddata.cFileName );
712 swprintf( psz_path, L"%s\\%s", psz_dir, finddata.cFileName );
714 unsigned int i_len = strlen( finddata.cFileName );
715 /* Skip ".", ".." and anything starting with "." */
716 if( !*finddata.cFileName || *finddata.cFileName == '.' )
718 if( !FindNextFile( handle, &finddata ) ) break;
721 sprintf( psz_path, "%s\\%s", psz_dir, finddata.cFileName );
724 if( GetFileAttributes( psz_path ) & FILE_ATTRIBUTE_DIRECTORY )
726 AllocatePluginDir( p_this, psz_path, i_maxdepth - 1 );
728 else if( i_len > strlen( LIBEXT )
732 /* We only load files ending with LIBEXT */
733 && !strncasecmp( psz_path + strlen( psz_path)
735 LIBEXT, strlen( LIBEXT ) ) )
738 AllocatePluginFile( p_this, psz_path );
741 while( FindNextFile( handle, &finddata ) );
743 /* Close the directory */
747 dir = opendir( psz_dir );
753 i_dirlen = strlen( psz_dir );
755 /* Parse the directory and try to load all files it contains. */
756 while( (file = readdir( dir )) )
761 /* Skip ".", ".." and anything starting with "." */
762 if( !*file->d_name || *file->d_name == '.' )
767 i_len = strlen( file->d_name );
768 psz_file = malloc( i_dirlen + 1 + i_len + 1 );
770 sprintf( psz_file, "%s\\%s", psz_dir, file->d_name );
772 sprintf( psz_file, "%s/%s", psz_dir, file->d_name );
775 if( !stat( psz_file, &statbuf ) && statbuf.st_mode & S_IFDIR )
777 AllocatePluginDir( p_this, psz_file, i_maxdepth - 1 );
779 else if( i_len > strlen( LIBEXT )
780 /* We only load files ending with LIBEXT */
781 && !strncasecmp( file->d_name + i_len - strlen( LIBEXT ),
782 LIBEXT, strlen( LIBEXT ) ) )
784 AllocatePluginFile( p_this, psz_file );
790 /* Close the directory */
796 /*****************************************************************************
797 * AllocatePluginFile: load a module into memory and initialize it.
798 *****************************************************************************
799 * This function loads a dynamically loadable module and allocates a structure
800 * for its information data. The module can then be handled by module_Need
801 * and module_Unneed. It can be removed by DeleteModule.
802 *****************************************************************************/
803 static int AllocatePluginFile( vlc_object_t * p_this, MYCHAR * psz_file )
806 module_handle_t handle;
809 * Try to dynamically load the module. This part is very platform-
810 * specific, and error messages should be as verbose as possible.
813 #if defined(HAVE_DL_DYLD)
814 NSObjectFileImage image;
815 NSObjectFileImageReturnCode ret;
817 ret = NSCreateObjectFileImageFromFile( psz_file, &image );
819 if( ret != NSObjectFileImageSuccess )
821 msg_Warn( p_this, "cannot create image from `%s'", psz_file );
825 /* Open the dynamic module */
826 handle = NSLinkModule( image, psz_file,
827 NSLINKMODULE_OPTION_RETURN_ON_ERROR );
831 NSLinkEditErrors errors;
832 const char *psz_file, *psz_err;
834 NSLinkEditError( &errors, &i_errnum, &psz_file, &psz_err );
835 msg_Warn( p_this, "cannot link module `%s' (%s)", psz_file, psz_err );
836 NSDestroyObjectFileImage( image );
840 /* Destroy our image, we won't need it */
841 NSDestroyObjectFileImage( image );
843 #elif defined(HAVE_DL_BEOS)
844 handle = load_add_on( psz_file );
847 msg_Warn( p_this, "cannot load module `%s'", psz_file );
851 #elif defined(HAVE_DL_WINDOWS) && defined(UNDER_CE)
852 char psz_filename[MAX_PATH];
853 WideCharToMultiByte( CP_ACP, WC_DEFAULTCHAR, psz_file, -1,
854 psz_filename, MAX_PATH, NULL, NULL );
855 handle = LoadLibrary( psz_filename );
858 char *psz_error = GetWindowsError();
859 msg_Warn( p_this, "cannot load module `%s' (%s)",
860 psz_filename, psz_error );
864 #elif defined(HAVE_DL_WINDOWS) && defined(WIN32)
865 char psz_filename[MAX_PATH];
866 handle = LoadLibrary( psz_file );
869 char *psz_error = GetWindowsError();
870 msg_Warn( p_this, "cannot load module `%s' (%s)",
871 psz_filename, psz_error );
875 #elif defined(HAVE_DL_DLOPEN) && defined(RTLD_NOW)
876 /* static is OK, we are called atomically */
877 static vlc_bool_t b_kde = VLC_FALSE;
879 # if defined(SYS_LINUX)
880 /* XXX HACK #1 - we should NOT open modules with RTLD_GLOBAL, or we
881 * are going to get namespace collisions when two modules have common
882 * public symbols, but ALSA is being a pest here. */
883 if( strstr( psz_file, "alsa_plugin" ) )
885 handle = dlopen( psz_file, RTLD_NOW | RTLD_GLOBAL );
888 msg_Warn( p_this, "cannot load module `%s' (%s)",
889 psz_file, dlerror() );
894 /* XXX HACK #2 - the ugly KDE workaround. It seems that libkdewhatever
895 * causes dlopen() to segfault if libstdc++ is not loaded in the caller,
896 * so we just load libstdc++. Bwahahaha! ph34r! -- Sam. */
897 /* Update: FYI, this is Debian bug #180505, and seems to be fixed. */
898 if( !b_kde && !strstr( psz_file, "kde" ) )
900 dlopen( "libstdc++.so.6", RTLD_NOW )
901 || dlopen( "libstdc++.so.5", RTLD_NOW )
902 || dlopen( "libstdc++.so.4", RTLD_NOW )
903 || dlopen( "libstdc++.so.3", RTLD_NOW );
907 handle = dlopen( psz_file, RTLD_NOW );
910 msg_Warn( p_this, "cannot load module `%s' (%s)",
911 psz_file, dlerror() );
915 #elif defined(HAVE_DL_DLOPEN)
916 # if defined(DL_LAZY)
917 handle = dlopen( psz_file, DL_LAZY );
919 handle = dlopen( psz_file, 0 );
923 msg_Warn( p_this, "cannot load module `%s' (%s)",
924 psz_file, dlerror() );
928 #elif defined(HAVE_DL_SHL_LOAD)
929 handle = shl_load( psz_file, BIND_IMMEDIATE | BIND_NONFATAL, NULL );
932 msg_Warn( p_this, "cannot load module `%s' (%s)",
933 psz_file, strerror(errno) );
938 # error "Something is wrong in modules.c"
942 /* Now that we have successfully loaded the module, we can
943 * allocate a structure for it */
944 p_module = vlc_object_create( p_this, VLC_OBJECT_MODULE );
945 if( p_module == NULL )
947 msg_Err( p_this, "out of memory" );
948 CloseModule( handle );
952 /* We need to fill these since they may be needed by CallEntry() */
954 p_module->psz_filename = psz_filename;
956 p_module->psz_filename = psz_file;
958 p_module->handle = handle;
959 p_module->p_symbols = &p_this->p_libvlc->p_module_bank->symbols;
961 /* Initialize the module: fill p_module->psz_object_name, default config */
962 if( CallEntry( p_module ) != 0 )
964 /* We couldn't call module_init() */
965 vlc_object_destroy( p_module );
966 CloseModule( handle );
970 DupModule( p_module );
971 p_module->psz_filename = strdup( p_module->psz_filename );
972 p_module->psz_longname = strdup( p_module->psz_longname );
974 /* Everything worked fine ! The module is ready to be added to the list. */
975 p_module->b_builtin = VLC_FALSE;
977 /* msg_Dbg( p_this, "plugin \"%s\", %s",
978 p_module->psz_object_name, p_module->psz_longname ); */
980 vlc_object_attach( p_module, p_this->p_libvlc->p_module_bank );
985 /*****************************************************************************
986 * DupModule: make a plugin module standalone.
987 *****************************************************************************
988 * This function duplicates all strings in the module, so that the dynamic
989 * object can be unloaded. It acts recursively on submodules.
990 *****************************************************************************/
991 static void DupModule( module_t *p_module )
996 for( pp_shortcut = p_module->pp_shortcuts ; *pp_shortcut ; pp_shortcut++ )
998 *pp_shortcut = strdup( *pp_shortcut );
1001 /* We strdup() these entries so that they are still valid when the
1002 * module is unloaded. */
1003 p_module->psz_object_name = strdup( p_module->psz_object_name );
1004 p_module->psz_capability = strdup( p_module->psz_capability );
1006 if( p_module->psz_program != NULL )
1008 p_module->psz_program = strdup( p_module->psz_program );
1011 for( i_submodule = 0; i_submodule < p_module->i_children; i_submodule++ )
1013 DupModule( (module_t*)p_module->pp_children[ i_submodule ] );
1017 /*****************************************************************************
1018 * UndupModule: free a duplicated module.
1019 *****************************************************************************
1020 * This function frees the allocations done in DupModule().
1021 *****************************************************************************/
1022 static void UndupModule( module_t *p_module )
1027 for( i_submodule = 0; i_submodule < p_module->i_children; i_submodule++ )
1029 UndupModule( (module_t*)p_module->pp_children[ i_submodule ] );
1032 for( pp_shortcut = p_module->pp_shortcuts ; *pp_shortcut ; pp_shortcut++ )
1034 free( *pp_shortcut );
1037 free( p_module->psz_object_name );
1038 free( p_module->psz_capability );
1040 if( p_module->psz_program != NULL )
1042 free( p_module->psz_program );
1046 #endif /* HAVE_DYNAMIC_PLUGINS */
1048 /*****************************************************************************
1049 * AllocateBuiltinModule: initialize a builtin module.
1050 *****************************************************************************
1051 * This function registers a builtin module and allocates a structure
1052 * for its information data. The module can then be handled by module_Need
1053 * and module_Unneed. It can be removed by DeleteModule.
1054 *****************************************************************************/
1055 static int AllocateBuiltinModule( vlc_object_t * p_this,
1056 int ( *pf_entry ) ( module_t * ) )
1058 module_t * p_module;
1060 /* Now that we have successfully loaded the module, we can
1061 * allocate a structure for it */
1062 p_module = vlc_object_create( p_this, VLC_OBJECT_MODULE );
1063 if( p_module == NULL )
1065 msg_Err( p_this, "out of memory" );
1069 /* Initialize the module : fill p_module->psz_object_name, etc. */
1070 if( pf_entry( p_module ) != 0 )
1072 /* With a well-written module we shouldn't have to print an
1073 * additional error message here, but just make sure. */
1074 msg_Err( p_this, "failed calling entry point in builtin module" );
1075 vlc_object_destroy( p_module );
1079 /* Everything worked fine ! The module is ready to be added to the list. */
1080 p_module->b_builtin = VLC_TRUE;
1082 /* msg_Dbg( p_this, "builtin \"%s\", %s",
1083 p_module->psz_object_name, p_module->psz_longname ); */
1085 vlc_object_attach( p_module, p_this->p_libvlc->p_module_bank );
1090 /*****************************************************************************
1091 * DeleteModule: delete a module and its structure.
1092 *****************************************************************************
1093 * This function can only be called if the module isn't being used.
1094 *****************************************************************************/
1095 static int DeleteModule( module_t * p_module )
1097 vlc_object_detach( p_module );
1099 /* We free the structures that we strdup()ed in Allocate*Module(). */
1100 #ifdef HAVE_DYNAMIC_PLUGINS
1101 if( !p_module->b_builtin )
1103 if( p_module->b_unloadable )
1105 CloseModule( p_module->handle );
1107 UndupModule( p_module );
1108 free( p_module->psz_filename );
1109 free( p_module->psz_longname );
1113 /* Free and detach the object's children */
1114 while( p_module->i_children )
1116 vlc_object_t *p_this = p_module->pp_children[0];
1117 vlc_object_detach( p_this );
1118 vlc_object_destroy( p_this );
1121 config_Free( p_module );
1122 vlc_object_destroy( p_module );
1127 #ifdef HAVE_DYNAMIC_PLUGINS
1128 /*****************************************************************************
1129 * CallEntry: call an entry point.
1130 *****************************************************************************
1131 * This function calls a symbol given its name and a module structure. The
1132 * symbol MUST refer to a function returning int and taking a module_t* as
1134 *****************************************************************************/
1135 static int CallEntry( module_t * p_module )
1137 static char *psz_name = "vlc_entry" MODULE_SUFFIX;
1138 int (* pf_symbol) ( module_t * p_module );
1140 /* Try to resolve the symbol */
1141 pf_symbol = (int (*)(module_t *)) GetSymbol( p_module->handle, psz_name );
1143 if( pf_symbol == NULL )
1145 #if defined(HAVE_DL_DYLD) || defined(HAVE_DL_BEOS)
1146 msg_Warn( p_module, "cannot find symbol \"%s\" in file `%s'",
1147 psz_name, p_module->psz_filename );
1148 #elif defined(HAVE_DL_WINDOWS)
1149 char *psz_error = GetWindowsError();
1150 msg_Warn( p_module, "cannot find symbol \"%s\" in file `%s' (%s)",
1151 psz_name, p_module->psz_filename, psz_error );
1153 #elif defined(HAVE_DL_DLOPEN)
1154 msg_Warn( p_module, "cannot find symbol \"%s\" in file `%s' (%s)",
1155 psz_name, p_module->psz_filename, dlerror() );
1156 #elif defined(HAVE_DL_SHL_LOAD)
1157 msg_Warn( p_module, "cannot find symbol \"%s\" in file `%s' (%s)",
1158 psz_name, p_module->psz_filename, strerror(errno) );
1160 # error "Something is wrong in modules.c"
1164 /* We can now try to call the symbol */
1165 if( pf_symbol( p_module ) != 0 )
1167 /* With a well-written module we shouldn't have to print an
1168 * additional error message here, but just make sure. */
1169 msg_Err( p_module, "failed calling symbol \"%s\" in file `%s'",
1170 psz_name, p_module->psz_filename );
1174 /* Everything worked fine, we can return */
1178 /*****************************************************************************
1179 * CloseModule: unload a dynamic library
1180 *****************************************************************************
1181 * This function unloads a previously opened dynamically linked library
1182 * using a system dependant method. No return value is taken in consideration,
1183 * since some libraries sometimes refuse to close properly.
1184 *****************************************************************************/
1185 static void CloseModule( module_handle_t handle )
1187 #if defined(HAVE_DL_DYLD)
1188 NSUnLinkModule( handle, FALSE );
1190 #elif defined(HAVE_DL_BEOS)
1191 unload_add_on( handle );
1193 #elif defined(HAVE_DL_WINDOWS)
1194 FreeLibrary( handle );
1196 #elif defined(HAVE_DL_DLOPEN)
1199 #elif defined(HAVE_DL_SHL_LOAD)
1200 shl_unload( handle );
1206 /*****************************************************************************
1207 * GetSymbol: get a symbol from a dynamic library
1208 *****************************************************************************
1209 * This function queries a loaded library for a symbol specified in a
1210 * string, and returns a pointer to it. We don't check for dlerror() or
1211 * similar functions, since we want a non-NULL symbol anyway.
1212 *****************************************************************************/
1213 static void * _module_getsymbol( module_handle_t, const char * );
1215 static void * GetSymbol( module_handle_t handle, const char * psz_function )
1217 void * p_symbol = _module_getsymbol( handle, psz_function );
1219 /* MacOS X dl library expects symbols to begin with "_". So do
1220 * some other operating systems. That's really lame, but hey, what
1222 if( p_symbol == NULL )
1224 char *psz_call = malloc( strlen( psz_function ) + 2 );
1226 strcpy( psz_call + 1, psz_function );
1227 psz_call[ 0 ] = '_';
1228 p_symbol = _module_getsymbol( handle, psz_call );
1235 static void * _module_getsymbol( module_handle_t handle,
1236 const char * psz_function )
1238 #if defined(HAVE_DL_DYLD)
1239 NSSymbol sym = NSLookupSymbolInModule( handle, psz_function );
1240 return NSAddressOfSymbol( sym );
1242 #elif defined(HAVE_DL_BEOS)
1244 if( B_OK == get_image_symbol( handle, psz_function,
1245 B_SYMBOL_TYPE_TEXT, &p_symbol ) )
1254 #elif defined(HAVE_DL_WINDOWS) && defined(UNDER_CE)
1255 wchar_t psz_real[256];
1256 MultiByteToWideChar( CP_ACP, 0, psz_function, -1, psz_real, 256 );
1258 return (void *)GetProcAddress( handle, psz_real );
1260 #elif defined(HAVE_DL_WINDOWS) && defined(WIN32)
1261 return (void *)GetProcAddress( handle, (MYCHAR*)psz_function );
1263 #elif defined(HAVE_DL_DLOPEN)
1264 return dlsym( handle, psz_function );
1266 #elif defined(HAVE_DL_SHL_LOAD)
1268 shl_findsym( &handle, psz_function, TYPE_UNDEFINED, &p_sym );
1274 #if defined(HAVE_DL_WINDOWS)
1275 static char * GetWindowsError( void )
1277 #if defined(UNDER_CE)
1278 wchar_t psz_tmp[256];
1279 char * psz_buffer = malloc( 256 );
1281 char * psz_tmp = malloc( 256 );
1283 int i = 0, i_error = GetLastError();
1285 FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
1286 NULL, i_error, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
1287 (LPTSTR) psz_tmp, 256, NULL );
1289 /* Go to the end of the string */
1290 #if defined(UNDER_CE)
1291 while( psz_tmp[i] && psz_tmp[i] != L'\r' && psz_tmp[i] != L'\n' )
1293 while( psz_tmp[i] && psz_tmp[i] != '\r' && psz_tmp[i] != '\n' )
1301 #if defined(UNDER_CE)
1302 swprintf( psz_tmp + i, L" (error %i)", i_error );
1303 psz_tmp[ 255 ] = L'\0';
1305 snprintf( psz_tmp + i, 256 - i, " (error %i)", i_error );
1306 psz_tmp[ 255 ] = '\0';
1310 #if defined(UNDER_CE)
1311 WideCharToMultiByte( CP_ACP, WC_DEFAULTCHAR, psz_tmp, -1,
1312 psz_buffer, 256, NULL, NULL );
1318 #endif /* HAVE_DL_WINDOWS */
1320 #endif /* HAVE_DYNAMIC_PLUGINS */