git.sesse.net Git - vlc/blob - plugins/dvd/dvd.c

   1 /*****************************************************************************
   2  * dvd.c : DVD input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2001 VideoLAN
   5  * $Id: dvd.c,v 1.21 2002/03/01 00:33:18 massiot Exp $
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   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.
  13  *
  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.
  18  *
  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  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>                                              /* strdup() */
  29
  30 #include <videolan/vlc.h>
  31
  32 #ifdef GOD_DAMN_DMCA
  33 #   include <dlfcn.h>
  34 #   include "dummy_dvdcss.h"
  35 #endif
  36
  37 /*****************************************************************************
  38  * Capabilities defined in the other files.
  39  *****************************************************************************/
  40 void _M( access_getfunctions )( function_list_t * p_function_list );
  41 void _M( demux_getfunctions )( function_list_t * p_function_list );
  42
  43 /*****************************************************************************
  44  * Local prototypes.
  45  *****************************************************************************/
  46 #ifdef GOD_DAMN_DMCA
  47 static void *p_libdvdcss;
  48 static void ProbeLibDVDCSS  ( void );
  49 static void UnprobeLibDVDCSS( void );
  50 #endif
  51
  52 /*****************************************************************************
  53  * Build configuration tree.
  54  *****************************************************************************/
  55 MODULE_CONFIG_START
  56 MODULE_CONFIG_STOP
  57
  58 MODULE_INIT_START
  59 #ifdef GOD_DAMN_DMCA
  60     SET_DESCRIPTION( "DVD input module, uses libdvdcss if present" )
  61 #else
  62     SET_DESCRIPTION( "DVD input module, linked with libdvdcss" )
  63 #endif
  64     ADD_CAPABILITY( ACCESS, 0 )
  65     ADD_CAPABILITY( DEMUX, 0 )
  66     ADD_SHORTCUT( "dvd" )
  67 MODULE_INIT_STOP
  68
  69 MODULE_ACTIVATE_START
  70     _M( access_getfunctions )( &p_module->p_functions->access );
  71     _M( demux_getfunctions )( &p_module->p_functions->demux );
  72 #ifdef GOD_DAMN_DMCA
  73     ProbeLibDVDCSS();
  74 #endif
  75 MODULE_ACTIVATE_STOP
  76
  77 MODULE_DEACTIVATE_START
  78 #ifdef GOD_DAMN_DMCA
  79     UnprobeLibDVDCSS();
  80 #endif
  81 MODULE_DEACTIVATE_STOP
  82
  83
  84 /* Following functions are local */
  85
  86 #ifdef GOD_DAMN_DMCA
  87 /*****************************************************************************
  88  * ProbeLibDVDCSS: look for a libdvdcss object.
  89  *****************************************************************************
  90  * This functions looks for libdvdcss, using dlopen(), and fills function
  91  * pointers with what it finds. On failure, uses the dummy libdvdcss
  92  * replacement provided by vlc.
  93  *****************************************************************************/
  94 static void ProbeLibDVDCSS( void )
  95 {
  96     char *pp_filelist[4] = { "libdvdcss.so.1",
  97                              "./libdvdcss.so.1",
  98                              "./lib/libdvdcss.so.1",
  99                              NULL };
 100     char **pp_file = pp_filelist;
 101
 102     /* Try to open the dynamic object */
 103     do
 104     {
 105         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 106         if( p_libdvdcss != NULL )
 107         {
 108             intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 109                              "in `%s'", *pp_file );
 110             break;
 111         }
 112         pp_file++;
 113
 114     } while( *pp_file != NULL );
 115
 116     /* If libdvdcss.so was found, check that it's valid */
 117     if( p_libdvdcss == NULL )
 118     {
 119         intf_ErrMsg( "dvd warning: libdvdcss.so.1 not present" );
 120     }
 121     else
 122     {
 123         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 124         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 125         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 126         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 127         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 128         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 129         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 130
 131         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 132              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 133              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 134              || ____dvdcss_error == NULL )
 135         {
 136             intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.1, "
 137                          "this shouldn't happen !" );
 138             dlclose( p_libdvdcss );
 139             p_libdvdcss = NULL;
 140         }
 141     }
 142
 143     /* If libdvdcss was not found or was not valid, use the dummy
 144      * replacement functions. */
 145     if( p_libdvdcss == NULL )
 146     {
 147         intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 148                      "I will only play unencrypted DVDs" );
 149         intf_ErrMsg( "dvd warning: get libdvdcss at "
 150                      "http://www.videolan.org/libdvdcss/" );
 151
 152         ____dvdcss_open = dummy_dvdcss_open;
 153         ____dvdcss_close = dummy_dvdcss_close;
 154         ____dvdcss_title = dummy_dvdcss_title;
 155         ____dvdcss_seek = dummy_dvdcss_seek;
 156         ____dvdcss_read = dummy_dvdcss_read;
 157         ____dvdcss_readv = dummy_dvdcss_readv;
 158         ____dvdcss_error = dummy_dvdcss_error;
 159     }
 160 }
 161
 162 /*****************************************************************************
 163  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 164  *****************************************************************************/
 165 static void UnprobeLibDVDCSS( void )
 166 {
 167     if( p_libdvdcss != NULL )
 168     {
 169         dlclose( p_libdvdcss );
 170         p_libdvdcss = NULL;
 171     }
 172 }
 173 #endif
 174