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modules.c
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/*****************************************************************************
* modules.c : Builtin and plugin modules management functions
*****************************************************************************
* Copyright (C) 2001 VideoLAN
* $Id: modules.c,v 1.117 2003/03/25 15:38:14 gbazin Exp $
*
* Authors: Samuel Hocevar <sam@zoy.org>
* Ethan C. Baldridge <BaldridgeE@cadmus.com>
* Hans-Peter Jansen <hpj@urpla.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/* Some faulty libcs have a broken struct dirent when _FILE_OFFSET_BITS
* is set to 64. Don't try to be cleverer. */
#ifdef _FILE_OFFSET_BITS
#undef _FILE_OFFSET_BITS
#endif
#include <stdlib.h> /* free(), strtol() */
#include <stdio.h> /* sprintf() */
#include <string.h> /* strdup() */
#include <vlc/vlc.h>
#ifdef HAVE_DIRENT_H
# include <dirent.h>
#elif defined( UNDER_CE )
# include <windows.h> /* GetFileAttributes() */
#else
# include "../extras/dirent.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if defined(HAVE_DLFCN_H) /* Linux, BSD, Hurd */
# include <dlfcn.h> /* dlopen(), dlsym(), dlclose() */
# define HAVE_DYNAMIC_PLUGINS
#elif defined(HAVE_IMAGE_H) /* BeOS */
# include <image.h>
# define HAVE_DYNAMIC_PLUGINS
#elif defined(UNDER_CE)
# define HAVE_DYNAMIC_PLUGINS
#elif defined(WIN32)
# define HAVE_DYNAMIC_PLUGINS
#else
# undef HAVE_DYNAMIC_PLUGINS
#endif
#include "error.h"
#include "netutils.h"
#include "interface.h"
#include "vlc_playlist.h"
#include "intf_eject.h"
#include "stream_control.h"
#include "input_ext-intf.h"
#include "input_ext-dec.h"
#include "input_ext-plugins.h"
#include "video.h"
#include "video_output.h"
#include "audio_output.h"
#include "aout_internal.h"
#include "stream_output.h"
#include "iso_lang.h"
#if defined( UNDER_CE )
# define MYCHAR wchar_t
#else
# define MYCHAR char
#endif
#ifdef HAVE_DYNAMIC_PLUGINS
# include "modules_plugin.h"
#endif
#if defined( UNDER_CE )
# include "modules_builtin_evc.h"
#elif defined( _MSC_VER )
# include "modules_builtin_msvc.h"
#else
# include "modules_builtin.h"
#endif
/*****************************************************************************
* Local prototypes
*****************************************************************************/
#ifdef HAVE_DYNAMIC_PLUGINS
static void AllocateAllPlugins ( vlc_object_t * );
static void AllocatePluginDir ( vlc_object_t *, const MYCHAR *, int );
static int AllocatePluginFile ( vlc_object_t *, MYCHAR * );
#endif
static int AllocateBuiltinModule( vlc_object_t *, int ( * ) ( module_t * ) );
static int DeleteModule ( module_t * );
#ifdef HAVE_DYNAMIC_PLUGINS
static void DupModule ( module_t * );
static void UndupModule ( module_t * );
static int CallEntry ( module_t * );
#endif
/*****************************************************************************
* module_InitBank: create the module bank.
*****************************************************************************
* This function creates a module bank structure which will be filled later
* on with all the modules found.
*****************************************************************************/
void __module_InitBank( vlc_object_t *p_this )
{
module_bank_t *p_bank;
p_bank = vlc_object_create( p_this, sizeof(module_bank_t) );
p_bank->psz_object_name = "module bank";
/*
* Store the symbols to be exported
*/
#ifdef HAVE_DYNAMIC_PLUGINS
STORE_SYMBOLS( &p_bank->symbols );
#endif
/* Everything worked, attach the object */
p_this->p_libvlc->p_module_bank = p_bank;
vlc_object_attach( p_bank, p_this->p_libvlc );
return;
}
/*****************************************************************************
* module_ResetBank: reset the module bank.
*****************************************************************************
* This function resets the module bank by unloading all unused plugin
* modules.
*****************************************************************************/
void __module_ResetBank( vlc_object_t *p_this )
{
msg_Err( p_this, "FIXME: module_ResetBank unimplemented" );
return;
}
/*****************************************************************************
* module_EndBank: empty the module bank.
*****************************************************************************
* This function unloads all unused plugin modules and empties the module
* bank in case of success.
*****************************************************************************/
void __module_EndBank( vlc_object_t *p_this )
{
module_t * p_next;
vlc_object_detach( p_this->p_libvlc->p_module_bank );
while( p_this->p_libvlc->p_module_bank->i_children )
{
p_next = (module_t *)p_this->p_libvlc->p_module_bank->pp_children[0];
if( DeleteModule( p_next ) )
{
/* Module deletion failed */
msg_Err( p_this, "module \"%s\" can't be removed, trying harder",
p_next->psz_object_name );
/* We just free the module by hand. Niahahahahaha. */
vlc_object_detach( p_next );
vlc_object_destroy( p_next );
}
}
vlc_object_destroy( p_this->p_libvlc->p_module_bank );
return;
}
/*****************************************************************************
* module_LoadMain: load the main program info into the module bank.
*****************************************************************************
* This function fills the module bank structure with the main module infos.
* This is very useful as it will allow us to consider the main program just
* as another module, and for instance the configuration options of main will
* be available in the module bank structure just as for every other module.
*****************************************************************************/
void __module_LoadMain( vlc_object_t *p_this )
{
AllocateBuiltinModule( p_this, vlc_entry__main );
}
/*****************************************************************************
* module_LoadBuiltins: load all modules which we built with.
*****************************************************************************
* This function fills the module bank structure with the builtin modules.
*****************************************************************************/
void __module_LoadBuiltins( vlc_object_t * p_this )
{
msg_Dbg( p_this, "checking builtin modules" );
ALLOCATE_ALL_BUILTINS();
}
/*****************************************************************************
* module_LoadPlugins: load all plugin modules we can find.
*****************************************************************************
* This function fills the module bank structure with the plugin modules.
*****************************************************************************/
void __module_LoadPlugins( vlc_object_t * p_this )
{
#ifdef HAVE_DYNAMIC_PLUGINS
msg_Dbg( p_this, "checking plugin modules" );
AllocateAllPlugins( p_this );
#endif
}
/*****************************************************************************
* module_Need: return the best module function, given a capability list.
*****************************************************************************
* This function returns the module that best fits the asked capabilities.
*****************************************************************************/
module_t * __module_Need( vlc_object_t *p_this, const char *psz_capability,
const char *psz_name )
{
typedef struct module_list_t module_list_t;
struct module_list_t
{
module_t *p_module;
int i_score;
module_list_t *p_next;
};
module_list_t *p_list, *p_first, *p_tmp;
vlc_list_t *p_all;
int i_which_module, i_index = 0;
vlc_bool_t b_intf = VLC_FALSE;
module_t *p_module;
int i_shortcuts = 0;
char *psz_shortcuts = NULL, *psz_var = NULL;
msg_Dbg( p_this, "looking for %s module", psz_capability );
/* Deal with variables */
if( psz_name && psz_name[0] == '$' )
{
psz_var = config_GetPsz( p_this, psz_name + 1 );
psz_name = psz_var;
}
/* Count how many different shortcuts were asked for */
if( psz_name && *psz_name )
{
char *psz_parser;
/* If the user wants none, give him none. */
if( !strcmp( psz_name, "none" ) )
{
if( psz_var ) free( psz_var );
return NULL;
}
i_shortcuts++;
psz_shortcuts = strdup( psz_name );
for( psz_parser = psz_shortcuts; *psz_parser; psz_parser++ )
{
if( *psz_parser == ',' )
{
*psz_parser = '\0';
i_shortcuts++;
}
}
}
/* Sort the modules and test them */
p_all = vlc_list_find( p_this, VLC_OBJECT_MODULE, FIND_ANYWHERE );
p_list = malloc( p_all->i_count * sizeof( module_list_t ) );
p_first = NULL;
/* Parse the module list for capabilities and probe each of them */
for( i_which_module = 0; i_which_module < p_all->i_count; i_which_module++ )
{
module_t * p_submodule = NULL;
int i_shortcut_bonus = 0, i_submodule;
p_module = (module_t *)p_all->p_values[i_which_module].p_object;
/* Test that this module can do what we need */
if( strcmp( p_module->psz_capability, psz_capability ) )
{
for( i_submodule = 0;
i_submodule < p_module->i_children;
i_submodule++ )
{
if( !strcmp( ((module_t*)p_module->pp_children[ i_submodule ])
->psz_capability, psz_capability ) )
{
p_submodule =
(module_t*)p_module->pp_children[ i_submodule ];
break;
}
}
if( p_submodule == NULL )
{
continue;
}
p_module = p_submodule;
}
/* Test if we have the required CPU */
if( (p_module->i_cpu & p_this->p_libvlc->i_cpu) != p_module->i_cpu )
{
continue;
}
/* If we required a shortcut, check this plugin provides it. */
if( i_shortcuts )
{
vlc_bool_t b_trash;
int i_dummy, i_short = i_shortcuts;
char *psz_name = psz_shortcuts;
/* Let's drop modules with a 0 score (unless they are
* explicitly requested) */
b_trash = !p_module->i_score;
while( i_short )
{
/* If the last given shortcut is "none" and we couldn't
* find the module in the list of provided shortcuts,
* then kick the bastard out of here!!! */
if( (i_short == 1) && !strcmp(psz_name, "none") )
{
b_trash = VLC_TRUE;
break;
}
for( i_dummy = 0; p_module->pp_shortcuts[i_dummy]; i_dummy++ )
{
if( !strcmp( psz_name,
p_module->pp_shortcuts[i_dummy] ) )
{
/* Found it */
b_trash = VLC_FALSE;
i_shortcut_bonus = i_short * 10000;
break;
}
}
if( i_shortcut_bonus )
{
/* We found it... remember ? */
break;
}
/* Go to the next shortcut... This is so lame! */
while( *psz_name )
{
psz_name++;
}
psz_name++;
i_short--;
}
if( b_trash )
{
continue;
}
}
/* If we didn't require a shortcut, trash zero-scored plugins */
else if( !p_module->i_score )
{
continue;
}
/* Special case: test if we requested a particular intf plugin */
if( p_module->psz_program
&& !strcmp( p_module->psz_program,
p_this->p_vlc->psz_object_name ) )
{
if( !b_intf )
{
/* Remove previous non-matching plugins */
i_index = 0;
b_intf = VLC_TRUE;
}
}
else if( b_intf )
{
/* This one doesn't match */
continue;
}
/* Store this new module */
p_list[ i_index ].p_module = p_module;
p_list[ i_index ].i_score = p_module->i_score + i_shortcut_bonus;
/* Add it to the modules-to-probe list */
if( i_index == 0 )
{
p_list[ 0 ].p_next = NULL;
p_first = p_list;
}
else
{
/* Ok, so at school you learned that quicksort is quick, and
* bubble sort sucks raw eggs. But that's when dealing with
* thousands of items. Here we have barely 50. */
module_list_t *p_newlist = p_first;
if( p_first->i_score < p_list[ i_index ].i_score )
{
p_list[ i_index ].p_next = p_first;
p_first = &p_list[ i_index ];
}
else
{
while( p_newlist->p_next != NULL &&
p_newlist->p_next->i_score >= p_list[ i_index ].i_score )
{
p_newlist = p_newlist->p_next;
}
p_list[ i_index ].p_next = p_newlist->p_next;
p_newlist->p_next = &p_list[ i_index ];
}
}
i_index++;
}
msg_Dbg( p_this, "probing %i candidate%s",
i_index, i_index == 1 ? "" : "s" );
/* Lock all candidate modules */
p_tmp = p_first;
while( p_tmp != NULL )
{
vlc_object_yield( p_tmp->p_module );
p_tmp = p_tmp->p_next;
}
/* We can release the list, interesting modules were yielded */
vlc_list_release( p_all );
/* Parse the linked list and use the first successful module */
p_tmp = p_first;
while( p_tmp != NULL )
{
if( p_tmp->p_module->pf_activate
&& p_tmp->p_module->pf_activate( p_this ) == VLC_SUCCESS )
{
break;
}
vlc_object_release( p_tmp->p_module );
p_tmp = p_tmp->p_next;
}
/* Store the locked module value */
if( p_tmp != NULL )
{
p_module = p_tmp->p_module;
p_tmp = p_tmp->p_next;
}
else
{
p_module = NULL;
}
/* Unlock the remaining modules */
while( p_tmp != NULL )
{
vlc_object_release( p_tmp->p_module );
p_tmp = p_tmp->p_next;
}
free( p_list );
if( p_module != NULL )
{
msg_Dbg( p_module, "using %s module \"%s\"",
psz_capability, p_module->psz_object_name );
}
else if( p_first == NULL )
{
msg_Err( p_this, "no %s module matched \"%s\"",
psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
}
else if( psz_name != NULL && *psz_name )
{
msg_Warn( p_this, "no %s module matching \"%s\" could be loaded",
psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
}
if( psz_shortcuts )
{
free( psz_shortcuts );
}
if( psz_var )
{
free( psz_var );
}
/* Don't forget that the module is still locked */
return p_module;
}
/*****************************************************************************
* module_Unneed: decrease the usage count of a module.
*****************************************************************************
* This function must be called by the thread that called module_Need, to
* decrease the reference count and allow for hiding of modules.
*****************************************************************************/
void __module_Unneed( vlc_object_t * p_this, module_t * p_module )
{
/* Use the close method */
if( p_module->pf_deactivate )
{
p_module->pf_deactivate( p_this );
}
msg_Dbg( p_module, "unlocking module \"%s\"", p_module->psz_object_name );
vlc_object_release( p_module );
return;
}
/*****************************************************************************
* Following functions are local.
*****************************************************************************/
/*****************************************************************************
* AllocateAllPlugins: load all plugin modules we can find.
*****************************************************************************/
#ifdef HAVE_DYNAMIC_PLUGINS
static void AllocateAllPlugins( vlc_object_t *p_this )
{
/* Yes, there are two NULLs because we replace one with "plugin-path". */
char * path[] = { "modules", PLUGIN_PATH, "plugins", NULL,
NULL };
char ** ppsz_path = path;
char * psz_fullpath;
#if defined( SYS_BEOS ) || defined( SYS_DARWIN ) \
|| ( defined( WIN32 ) && !defined( UNDER_CE ) )
int i_vlclen = strlen( p_this->p_libvlc->psz_vlcpath );
vlc_bool_t b_notinroot;
#endif
#if defined( UNDER_CE )
wchar_t psz_dir[MAX_PATH];
#endif
/* If the user provided a plugin path, we add it to the list */
path[ sizeof(path)/sizeof(char*) - 2 ] = config_GetPsz( p_this,
"plugin-path" );
#if defined( WIN32 ) && !defined( UNDER_CE ) && !defined( _MSC_VER )
/* If there is no 'plugins' nor 'modules' subdirectory, the user may have
* screwed up the unzipping stage, so we look into '.' instead */
if( !opendir( "plugins" ) && !opendir( "modules" )
&& !strcmp( *ppsz_path, "modules" ) )
{
*ppsz_path = ".";
}
#endif
for( ; *ppsz_path != NULL ; ppsz_path++ )
{
#if defined( SYS_BEOS ) || defined( SYS_DARWIN ) \
|| ( defined( WIN32 ) && !defined( UNDER_CE ) )
/* Store strlen(*ppsz_path) for later use. */
int i_dirlen = strlen( *ppsz_path );
b_notinroot = VLC_FALSE;
/* Under BeOS, we need to add beos_GetProgramPath() to access
* files under the current directory */
#ifdef WIN32
if( i_dirlen < 3 || (*ppsz_path)[3] != '\\' )
#else
if( (*ppsz_path)[0] != '/' )
#endif
{
i_dirlen += i_vlclen + 2;
b_notinroot = VLC_TRUE;
psz_fullpath = malloc( i_dirlen );
if( psz_fullpath == NULL )
{
continue;
}
#ifdef WIN32
sprintf( psz_fullpath, "%s\\%s",
p_this->p_libvlc->psz_vlcpath, *ppsz_path );
#else
sprintf( psz_fullpath, "%s/%s",
p_this->p_libvlc->psz_vlcpath, *ppsz_path );
#endif
}
else
#endif
{
psz_fullpath = *ppsz_path;
}
msg_Dbg( p_this, "recursively browsing `%s'", psz_fullpath );
/* Don't go deeper than 5 subdirectories */
#if defined( UNDER_CE )
MultiByteToWideChar( CP_ACP, 0, psz_fullpath, -1, psz_dir, MAX_PATH );
AllocatePluginDir( p_this, psz_dir, 5 );
#else
AllocatePluginDir( p_this, psz_fullpath, 5 );
#endif
#if defined( SYS_BEOS ) || defined( SYS_DARWIN )
if( b_notinroot )
{
free( psz_fullpath );
}
#endif
}
/* Free plugin-path */
free( path[ sizeof(path)/sizeof(char*) - 2 ] );
path[ sizeof(path)/sizeof(char*) - 2 ] = NULL;
}
/*****************************************************************************
* AllocatePluginDir: recursively parse a directory to look for plugins
*****************************************************************************/
static void AllocatePluginDir( vlc_object_t *p_this, const MYCHAR *psz_dir,
int i_maxdepth )
{
#if defined( UNDER_CE ) || defined( _MSC_VER )
#ifdef UNDER_CE
MYCHAR psz_path[MAX_PATH + 256];
#else
char psz_path[MAX_PATH + 256];
#endif
WIN32_FIND_DATA finddata;
HANDLE handle;
unsigned int rc;
#else
int i_dirlen;
DIR * dir;
char * psz_file;
struct dirent * file;
#endif
if( i_maxdepth < 0 )
{
return;
}
#if defined( UNDER_CE ) || defined( _MSC_VER )
rc = GetFileAttributes( psz_dir );
if( !(rc & FILE_ATTRIBUTE_DIRECTORY) )
{
/* Not a directory */
return;
}
/* Parse all files in the directory */
#ifdef UNDER_CE
swprintf( psz_path, L"%s\\*.*", psz_dir );
#else
sprintf( psz_path, "%s\\*.*", psz_dir );
#endif
handle = FindFirstFile( psz_path, &finddata );
if( handle == INVALID_HANDLE_VALUE )
{
/* Empty directory */
return;
}
/* Parse the directory and try to load all files it contains. */
do
{
#ifdef UNDER_CE
unsigned int i_len = wcslen( finddata.cFileName );
swprintf( psz_path, L"%s\\%s", psz_dir, finddata.cFileName );
#else
unsigned int i_len = strlen( finddata.cFileName );
/* Skip ".", ".." and anything starting with "." */
if( !*finddata.cFileName || *finddata.cFileName == '.' )
{
if( !FindNextFile( handle, &finddata ) ) break;
continue;
}
sprintf( psz_path, "%s\\%s", psz_dir, finddata.cFileName );
#endif
if( GetFileAttributes( psz_path ) & FILE_ATTRIBUTE_DIRECTORY )
{
AllocatePluginDir( p_this, psz_path, i_maxdepth - 1 );
}
else if( i_len > strlen( LIBEXT )
#ifdef UNDER_CE
)
#else
/* We only load files ending with LIBEXT */
&& !strncasecmp( psz_path + strlen( psz_path)
- strlen( LIBEXT ),
LIBEXT, strlen( LIBEXT ) ) )
#endif
{
AllocatePluginFile( p_this, psz_path );
}
}
while( FindNextFile( handle, &finddata ) );
/* Close the directory */
FindClose( handle );
#else
dir = opendir( psz_dir );
if( !dir )
{
return;
}
i_dirlen = strlen( psz_dir );
/* Parse the directory and try to load all files it contains. */
while( (file = readdir( dir )) )
{
struct stat statbuf;
unsigned int i_len;
/* Skip ".", ".." and anything starting with "." */
if( !*file->d_name || *file->d_name == '.' )
{
continue;
}
i_len = strlen( file->d_name );
psz_file = malloc( i_dirlen + 1 + i_len + 1 );
#ifdef WIN32
sprintf( psz_file, "%s\\%s", psz_dir, file->d_name );
#else
sprintf( psz_file, "%s/%s", psz_dir, file->d_name );
#endif
if( !stat( psz_file, &statbuf ) && statbuf.st_mode & S_IFDIR )
{
AllocatePluginDir( p_this, psz_file, i_maxdepth - 1 );
}
else if( i_len > strlen( LIBEXT )
/* We only load files ending with LIBEXT */
&& !strncasecmp( file->d_name + i_len - strlen( LIBEXT ),
LIBEXT, strlen( LIBEXT ) ) )
{
AllocatePluginFile( p_this, psz_file );
}
free( psz_file );
}
/* Close the directory */
closedir( dir );
#endif
}
/*****************************************************************************
* AllocatePluginFile: load a module into memory and initialize it.
*****************************************************************************
* This function loads a dynamically loadable module and allocates a structure
* for its information data. The module can then be handled by module_Need
* and module_Unneed. It can be removed by DeleteModule.
*****************************************************************************/
static int AllocatePluginFile( vlc_object_t * p_this, MYCHAR * psz_file )
{
module_t * p_module;
module_handle_t handle;
#ifdef UNDER_CE
char psz_filename[MAX_PATH];
WideCharToMultiByte( CP_ACP, WC_DEFAULTCHAR, psz_file, -1,
psz_filename, MAX_PATH, NULL, NULL );
#else
char * psz_filename = psz_file;
#endif
/* Try to dynamically load the module. */
if( module_load( psz_file, &handle ) )
{
char psz_buffer[256];
/* The plugin module couldn't be opened */
msg_Warn( p_this, "cannot open `%s' (%s)",
psz_filename, module_error( psz_buffer ) );
return -1;
}
/* Now that we have successfully loaded the module, we can
* allocate a structure for it */
p_module = vlc_object_create( p_this, VLC_OBJECT_MODULE );
if( p_module == NULL )
{
msg_Err( p_this, "out of memory" );
module_unload( handle );
return -1;
}
/* We need to fill these since they may be needed by CallEntry() */
p_module->psz_filename = psz_filename;
p_module->handle = handle;
p_module->p_symbols = &p_this->p_libvlc->p_module_bank->symbols;
/* Initialize the module: fill p_module->psz_object_name, default config */
if( CallEntry( p_module ) != 0 )
{
/* We couldn't call module_init() */
vlc_object_destroy( p_module );
module_unload( handle );
return -1;
}
DupModule( p_module );
p_module->psz_filename = strdup( p_module->psz_filename );
p_module->psz_longname = strdup( p_module->psz_longname );
/* Everything worked fine ! The module is ready to be added to the list. */
p_module->b_builtin = VLC_FALSE;
/* msg_Dbg( p_this, "plugin \"%s\", %s",
p_module->psz_object_name, p_module->psz_longname ); */
vlc_object_attach( p_module, p_this->p_libvlc->p_module_bank );
return 0;
}
/*****************************************************************************
* DupModule: make a plugin module standalone.
*****************************************************************************
* This function duplicates all strings in the module, so that the dynamic
* object can be unloaded. It acts recursively on submodules.
*****************************************************************************/
static void DupModule( module_t *p_module )
{
char **pp_shortcut;
int i_submodule;
for( pp_shortcut = p_module->pp_shortcuts ; *pp_shortcut ; pp_shortcut++ )
{
*pp_shortcut = strdup( *pp_shortcut );
}
/* We strdup() these entries so that they are still valid when the
* module is unloaded. */
p_module->psz_object_name = strdup( p_module->psz_object_name );
p_module->psz_capability = strdup( p_module->psz_capability );
if( p_module->psz_program != NULL )
{
p_module->psz_program = strdup( p_module->psz_program );
}
for( i_submodule = 0; i_submodule < p_module->i_children; i_submodule++ )
{
DupModule( (module_t*)p_module->pp_children[ i_submodule ] );
}
}
/*****************************************************************************
* UndupModule: free a duplicated module.
*****************************************************************************
* This function frees the allocations done in DupModule().
*****************************************************************************/
static void UndupModule( module_t *p_module )
{
char **pp_shortcut;
int i_submodule;
for( i_submodule = 0; i_submodule < p_module->i_children; i_submodule++ )
{
UndupModule( (module_t*)p_module->pp_children[ i_submodule ] );
}
for( pp_shortcut = p_module->pp_shortcuts ; *pp_shortcut ; pp_shortcut++ )
{
free( *pp_shortcut );
}
free( p_module->psz_object_name );
free( p_module->psz_capability );
if( p_module->psz_program != NULL )
{
free( p_module->psz_program );
}
}
#endif /* HAVE_DYNAMIC_PLUGINS */
/*****************************************************************************
* AllocateBuiltinModule: initialize a builtin module.
*****************************************************************************
* This function registers a builtin module and allocates a structure
* for its information data. The module can then be handled by module_Need
* and module_Unneed. It can be removed by DeleteModule.
*****************************************************************************/
static int AllocateBuiltinModule( vlc_object_t * p_this,
int ( *pf_entry ) ( module_t * ) )
{
module_t * p_module;
/* Now that we have successfully loaded the module, we can
* allocate a structure for it */
p_module = vlc_object_create( p_this, VLC_OBJECT_MODULE );
if( p_module == NULL )
{
msg_Err( p_this, "out of memory" );
return -1;
}
/* Initialize the module : fill p_module->psz_object_name, etc. */
if( pf_entry( p_module ) != 0 )
{
/* With a well-written module we shouldn't have to print an
* additional error message here, but just make sure. */
msg_Err( p_this, "failed calling entry point in builtin module" );
vlc_object_destroy( p_module );
return -1;
}
/* Everything worked fine ! The module is ready to be added to the list. */
p_module->b_builtin = VLC_TRUE;
/* msg_Dbg( p_this, "builtin \"%s\", %s",
p_module->psz_object_name, p_module->psz_longname ); */
vlc_object_attach( p_module, p_this->p_libvlc->p_module_bank );
return 0;
}
/*****************************************************************************
* DeleteModule: delete a module and its structure.
*****************************************************************************
* This function can only be called if the module isn't being used.
*****************************************************************************/
static int DeleteModule( module_t * p_module )
{
vlc_object_detach( p_module );
/* We free the structures that we strdup()ed in Allocate*Module(). */
#ifdef HAVE_DYNAMIC_PLUGINS
if( !p_module->b_builtin )
{
if( p_module->b_unloadable )
{
module_unload( p_module->handle );
}
UndupModule( p_module );
free( p_module->psz_filename );
free( p_module->psz_longname );
}
#endif
/* Free and detach the object's children */
while( p_module->i_children )
{
vlc_object_t *p_this = p_module->pp_children[0];
vlc_object_detach( p_this );
vlc_object_destroy( p_this );
}
config_Free( p_module );
vlc_object_destroy( p_module );
return 0;
}
#ifdef HAVE_DYNAMIC_PLUGINS
/*****************************************************************************
* CallEntry: call an entry point.
*****************************************************************************
* This function calls a symbol given its name and a module structure. The
* symbol MUST refer to a function returning int and taking a module_t* as
* an argument.
*****************************************************************************/
static int CallEntry( module_t * p_module )
{
static char *psz_name = "vlc_entry" MODULE_SUFFIX;
int (* pf_symbol) ( module_t * p_module );
/* Try to resolve the symbol */
pf_symbol = (int (*)(module_t *)) module_getsymbol( p_module->handle,
psz_name );
if( pf_symbol == NULL )
{
char psz_buffer[256];
/* We couldn't load the symbol */
msg_Warn( p_module, "cannot find symbol \"%s\" in file `%s' (%s)",
psz_name, p_module->psz_filename,
module_error( psz_buffer ) );
return -1;
}
/* We can now try to call the symbol */
if( pf_symbol( p_module ) != 0 )
{
/* With a well-written module we shouldn't have to print an
* additional error message here, but just make sure. */
msg_Err( p_module, "failed calling symbol \"%s\" in file `%s'",
psz_name, p_module->psz_filename );
return -1;
}
/* Everything worked fine, we can return */
return 0;
}
#endif /* HAVE_DYNAMIC_PLUGINS */