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

   1 /*****************************************************************************
   2  * dvd.c : DVD input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000 VideoLAN
   5  * $Id: dvd.c,v 1.12 2001/08/06 13:28:00 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 #define MODULE_NAME dvd
  25 #include "modules_inner.h"
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30 #include "defs.h"
  31
  32 #include <stdlib.h>                                      /* malloc(), free() */
  33 #include <string.h>                                              /* strdup() */
  34
  35 #ifdef GOD_DAMN_DMCA
  36 #   include <dlfcn.h>
  37 #   include "dummy_dvdcss.h"
  38 #endif
  39
  40 #include "config.h"
  41 #include "common.h"                                     /* boolean_t, byte_t */
  42 #include "threads.h"
  43 #include "mtime.h"
  44
  45 #include "intf_msg.h"
  46
  47 #include "modules.h"
  48 #include "modules_export.h"
  49
  50 /*****************************************************************************
  51  * Capabilities defined in the other files.
  52  *****************************************************************************/
  53 void _M( input_getfunctions )( function_list_t * p_function_list );
  54
  55 /*****************************************************************************
  56  * Local prototypes.
  57  *****************************************************************************/
  58 #ifdef GOD_DAMN_DMCA
  59 static void *p_libdvdcss;
  60 static void ProbeLibDVDCSS  ( void );
  61 static void UnprobeLibDVDCSS( void );
  62 #endif
  63
  64 /*****************************************************************************
  65  * Build configuration tree.
  66  *****************************************************************************/
  67 MODULE_CONFIG_START
  68 ADD_WINDOW( "Configuration for DVD module" )
  69     ADD_COMMENT( "foobar !" )
  70 MODULE_CONFIG_STOP
  71
  72 MODULE_INIT_START
  73     p_module->i_capabilities = MODULE_CAPABILITY_NULL
  74                                 | MODULE_CAPABILITY_INPUT;
  75 #ifdef GOD_DAMN_DMCA
  76     p_module->psz_longname = "DVD input module, uses libdvdcss if present";
  77 #else
  78     p_module->psz_longname = "DVD input module, linked with libdvdcss";
  79 #endif
  80 MODULE_INIT_STOP
  81
  82 MODULE_ACTIVATE_START
  83     _M( input_getfunctions )( &p_module->p_functions->input );
  84 #ifdef GOD_DAMN_DMCA
  85     ProbeLibDVDCSS();
  86 #endif
  87 MODULE_ACTIVATE_STOP
  88
  89 MODULE_DEACTIVATE_START
  90 #ifdef GOD_DAMN_DMCA
  91     UnprobeLibDVDCSS();
  92 #endif
  93 MODULE_DEACTIVATE_STOP
  94
  95
  96 /* Following functions are local */
  97
  98 #ifdef GOD_DAMN_DMCA
  99 /*****************************************************************************
 100  * ProbeLibDVDCSS: look for a libdvdcss object.
 101  *****************************************************************************
 102  * This functions looks for libdvdcss, using dlopen(), and fills function
 103  * pointers with what it finds. On failure, uses the dummy libdvdcss
 104  * replacement provided by vlc.
 105  *****************************************************************************/
 106 static void ProbeLibDVDCSS( void )
 107 {
 108     char *pp_filelist[4] = { "libdvdcss.so.0",
 109                              "./libdvdcss.so.0",
 110                              "./lib/libdvdcss.so.0",
 111                              NULL };
 112     char **pp_file = pp_filelist;
 113
 114     /* Try to open the dynamic object */
 115     do
 116     {
 117         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 118         if( p_libdvdcss != NULL )
 119         {
 120             intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 121                              "in `%s'", *pp_file );
 122             break;
 123         }
 124         pp_file++;
 125
 126     } while( *pp_file != NULL );
 127
 128     /* If libdvdcss.so was found, check that it's valid */
 129     if( p_libdvdcss == NULL )
 130     {
 131         intf_ErrMsg( "dvd warning: libdvdcss.so.0 not present" );
 132     }
 133     else
 134     {
 135         /* Check for libdvdcss 0.0.1 */
 136         if( dlsym( p_libdvdcss, "dvdcss_crack" ) != NULL )
 137         {
 138             intf_ErrMsg( "dvd warning: libdvdcss.so.0 has deprecated symbol "
 139                          "dvdcss_crack(), please upgrade" );
 140             dlclose( p_libdvdcss );
 141             p_libdvdcss = NULL;
 142         }
 143         else
 144         {
 145             dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 146             dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 147             dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 148             dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 149             dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 150             dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 151             dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 152
 153             if( dvdcss_open == NULL || dvdcss_close == NULL
 154                  || dvdcss_title == NULL || dvdcss_seek == NULL
 155                  || dvdcss_read == NULL || dvdcss_readv == NULL
 156                  || dvdcss_error == NULL )
 157             {
 158                 intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.0, "
 159                              "please upgrade libdvdcss or vlc" );
 160                 dlclose( p_libdvdcss );
 161                 p_libdvdcss = NULL;
 162             }
 163         }
 164     }
 165
 166     /* If libdvdcss was not found or was not valid, use the dummy
 167      * replacement functions. */
 168     if( p_libdvdcss == NULL )
 169     {
 170         intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 171                      "I will only play unencrypted DVDs" );
 172
 173         dvdcss_open = dummy_dvdcss_open;
 174         dvdcss_close = dummy_dvdcss_close;
 175         dvdcss_title = dummy_dvdcss_title;
 176         dvdcss_seek = dummy_dvdcss_seek;
 177         dvdcss_read = dummy_dvdcss_read;
 178         dvdcss_readv = dummy_dvdcss_readv;
 179         dvdcss_error = dummy_dvdcss_error;
 180     }
 181 }
 182
 183 /*****************************************************************************
 184  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 185  *****************************************************************************/
 186 static void UnprobeLibDVDCSS( void )
 187 {
 188     if( p_libdvdcss != NULL )
 189     {
 190         dlclose( p_libdvdcss );
 191         p_libdvdcss = NULL;
 192     }
 193 }
 194 #endif
 195