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 1.18 2002/01/07 02:12:29 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( "DVD input module, uses libdvdcss if present" )
  60     ADD_CAPABILITY( INPUT, 90 )
  61 #else
  62     SET_DESCRIPTION( "DVD input module, linked with libdvdcss" )
  63     ADD_CAPABILITY( INPUT, 100 )
  64 #endif
  65     ADD_SHORTCUT( "dvd" )
  66 MODULE_INIT_STOP
  67
  68 MODULE_ACTIVATE_START
  69     _M( input_getfunctions )( &p_module->p_functions->input );
  70 #ifdef GOD_DAMN_DMCA
  71     ProbeLibDVDCSS();
  72 #endif
  73 MODULE_ACTIVATE_STOP
  74
  75 MODULE_DEACTIVATE_START
  76 #ifdef GOD_DAMN_DMCA
  77     UnprobeLibDVDCSS();
  78 #endif
  79 MODULE_DEACTIVATE_STOP
  80
  81
  82 /* Following functions are local */
  83
  84 #ifdef GOD_DAMN_DMCA
  85 /*****************************************************************************
  86  * ProbeLibDVDCSS: look for a libdvdcss object.
  87  *****************************************************************************
  88  * This functions looks for libdvdcss, using dlopen(), and fills function
  89  * pointers with what it finds. On failure, uses the dummy libdvdcss
  90  * replacement provided by vlc.
  91  *****************************************************************************/
  92 static void ProbeLibDVDCSS( void )
  93 {
  94     char *pp_filelist[4] = { "libdvdcss.so.1",
  95                              "./libdvdcss.so.1",
  96                              "./lib/libdvdcss.so.1",
  97                              NULL };
  98     char **pp_file = pp_filelist;
  99
 100     /* Try to open the dynamic object */
 101     do
 102     {
 103         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 104         if( p_libdvdcss != NULL )
 105         {
 106             intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 107                              "in `%s'", *pp_file );
 108             break;
 109         }
 110         pp_file++;
 111
 112     } while( *pp_file != NULL );
 113
 114     /* If libdvdcss.so was found, check that it's valid */
 115     if( p_libdvdcss == NULL )
 116     {
 117         intf_ErrMsg( "dvd warning: libdvdcss.so.1 not present" );
 118     }
 119     else
 120     {
 121         ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 122         ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 123         ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 124         ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 125         ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 126         ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 127         ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 128
 129         if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
 130              || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
 131              || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
 132              || ____dvdcss_error == NULL )
 133         {
 134             intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.1, "
 135                          "this shouldn't happen !" );
 136             dlclose( p_libdvdcss );
 137             p_libdvdcss = NULL;
 138         }
 139     }
 140
 141     /* If libdvdcss was not found or was not valid, use the dummy
 142      * replacement functions. */
 143     if( p_libdvdcss == NULL )
 144     {
 145         intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 146                      "I will only play unencrypted DVDs" );
 147         intf_ErrMsg( "dvd warning: get libdvdcss at "
 148                      "http://www.videolan.org/libdvdcss/" );
 149
 150         ____dvdcss_open = dummy_dvdcss_open;
 151         ____dvdcss_close = dummy_dvdcss_close;
 152         ____dvdcss_title = dummy_dvdcss_title;
 153         ____dvdcss_seek = dummy_dvdcss_seek;
 154         ____dvdcss_read = dummy_dvdcss_read;
 155         ____dvdcss_readv = dummy_dvdcss_readv;
 156         ____dvdcss_error = dummy_dvdcss_error;
 157     }
 158 }
 159
 160 /*****************************************************************************
 161  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 162  *****************************************************************************/
 163 static void UnprobeLibDVDCSS( void )
 164 {
 165     if( p_libdvdcss != NULL )
 166     {
 167         dlclose( p_libdvdcss );
 168         p_libdvdcss = NULL;
 169     }
 170 }
 171 #endif
 172