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

   1 /*****************************************************************************
   2  * dvdread.c : DvdRead input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: dvdread.c,v 1.6 2002/01/04 14:01:34 sam 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( input_getfunctions )( function_list_t * p_function_list );
  41
  42 /*****************************************************************************
  43  * Local prototypes.
  44  *****************************************************************************/
  45 #ifdef GOD_DAMN_DMCA
  46 static void *p_libdvdcss;
  47 static void ProbeLibDVDCSS  ( void );
  48 static void UnprobeLibDVDCSS( void );
  49 #endif
  50
  51 /*****************************************************************************
  52  * Build configuration tree.
  53  *****************************************************************************/
  54 MODULE_CONFIG_START
  55 MODULE_CONFIG_STOP
  56
  57 MODULE_INIT_START
  58 #ifdef GOD_DAMN_DMCA
  59     SET_DESCRIPTION( "DVDRead input module, uses libdvdcss if present" )
  60     ADD_CAPABILITY( INPUT, 70 )
  61 #else
  62     SET_DESCRIPTION( "DVDRead input module, linked with libdvdcss" )
  63     ADD_CAPABILITY( INPUT, 80 )
  64 #endif
  65     ADD_SHORTCUT( "dvdread" )
  66
  67 MODULE_INIT_STOP
  68
  69 MODULE_ACTIVATE_START
  70     _M( input_getfunctions )( &p_module->p_functions->input );
  71 #ifdef GOD_DAMN_DMCA
  72     ProbeLibDVDCSS();
  73 #endif
  74 MODULE_ACTIVATE_STOP
  75
  76 MODULE_DEACTIVATE_START
  77 #ifdef GOD_DAMN_DMCA
  78     UnprobeLibDVDCSS();
  79 #endif
  80 MODULE_DEACTIVATE_STOP
  81
  82
  83 /* Following functions are local */
  84
  85 #ifdef GOD_DAMN_DMCA
  86 /*****************************************************************************
  87  * ProbeLibDVDCSS: look for a libdvdcss object.
  88  *****************************************************************************
  89  * This functions looks for libdvdcss, using dlopen(), and fills function
  90  * pointers with what it finds. On failure, uses the dummy libdvdcss
  91  * replacement provided by vlc.
  92  *****************************************************************************/
  93 static void ProbeLibDVDCSS( void )
  94 {
  95     char *pp_filelist[4] = { "libdvdcss.so.0",
  96                              "./libdvdcss.so.0",
  97                              "./lib/libdvdcss.so.0",
  98                              NULL };
  99     char **pp_file = pp_filelist;
 100
 101     /* Try to open the dynamic object */
 102     do
 103     {
 104         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 105         if( p_libdvdcss != NULL )
 106         {
 107             intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 108                              "in `%s'", *pp_file );
 109             break;
 110         }
 111         pp_file++;
 112
 113     } while( *pp_file != NULL );
 114
 115     /* If libdvdcss.so was found, check that it's valid */
 116     if( p_libdvdcss == NULL )
 117     {
 118         intf_ErrMsg( "dvd warning: libdvdcss.so.0 not present" );
 119     }
 120     else
 121     {
 122         /* Check for libdvdcss 0.0.1 */
 123         if( dlsym( p_libdvdcss, "dvdcss_crack" ) != NULL )
 124         {
 125             intf_ErrMsg( "dvd warning: libdvdcss.so.0 has deprecated symbol "
 126                          "dvdcss_crack(), please upgrade" );
 127             dlclose( p_libdvdcss );
 128             p_libdvdcss = NULL;
 129         }
 130         else
 131         {
 132             dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 133             dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 134             dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 135             dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 136             dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 137             dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 138             dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 139
 140             if( dvdcss_open == NULL || dvdcss_close == NULL
 141                  || dvdcss_title == NULL || dvdcss_seek == NULL
 142                  || dvdcss_read == NULL || dvdcss_readv == NULL
 143                  || dvdcss_error == NULL )
 144             {
 145                 intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.0, "
 146                              "please upgrade libdvdcss or vlc" );
 147                 dlclose( p_libdvdcss );
 148                 p_libdvdcss = NULL;
 149             }
 150         }
 151     }
 152
 153     /* If libdvdcss was not found or was not valid, use the dummy
 154      * replacement functions. */
 155     if( p_libdvdcss == NULL )
 156     {
 157         intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 158                      "I will only play unencrypted DVDs" );
 159         intf_ErrMsg( "dvd warning: get libdvdcss at "
 160                      "http://www.videolan.org/libdvdcss/" );
 161
 162         dvdcss_open = dummy_dvdcss_open;
 163         dvdcss_close = dummy_dvdcss_close;
 164         dvdcss_title = dummy_dvdcss_title;
 165         dvdcss_seek = dummy_dvdcss_seek;
 166         dvdcss_read = dummy_dvdcss_read;
 167         dvdcss_readv = dummy_dvdcss_readv;
 168         dvdcss_error = dummy_dvdcss_error;
 169     }
 170 }
 171
 172 /*****************************************************************************
 173  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 174  *****************************************************************************/
 175 static void UnprobeLibDVDCSS( void )
 176 {
 177     if( p_libdvdcss != NULL )
 178     {
 179         dlclose( p_libdvdcss );
 180         p_libdvdcss = NULL;
 181     }
 182 }
 183 #endif
 184