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 1.2 2001/11/28 15:08:05 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 #define MODULE_NAME dvdread
  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 "intf_msg.h"
  43 #include "threads.h"
  44 #include "mtime.h"
  45
  46 #include "modules.h"
  47 #include "modules_export.h"
  48
  49 /*****************************************************************************
  50  * Capabilities defined in the other files.
  51  *****************************************************************************/
  52 void _M( input_getfunctions )( function_list_t * p_function_list );
  53
  54 /*****************************************************************************
  55  * Local prototypes.
  56  *****************************************************************************/
  57 #ifdef GOD_DAMN_DMCA
  58 static void *p_libdvdcss;
  59 static void ProbeLibDVDCSS  ( void );
  60 static void UnprobeLibDVDCSS( void );
  61 #endif
  62
  63 /*****************************************************************************
  64  * Build configuration tree.
  65  *****************************************************************************/
  66 MODULE_CONFIG_START
  67 ADD_WINDOW( "Configuration for DVD module" )
  68     ADD_COMMENT( "foobar !" )
  69 MODULE_CONFIG_STOP
  70
  71 MODULE_INIT_START
  72     p_module->i_capabilities = MODULE_CAPABILITY_NULL
  73                                 | MODULE_CAPABILITY_INPUT;
  74 #ifdef GOD_DAMN_DMCA
  75     p_module->psz_longname = "DVD input module, uses libdvdcss if present";
  76 #else
  77     p_module->psz_longname = "DVD input module, linked with libdvdcss";
  78 #endif
  79 MODULE_INIT_STOP
  80
  81 MODULE_ACTIVATE_START
  82     _M( input_getfunctions )( &p_module->p_functions->input );
  83 #ifdef GOD_DAMN_DMCA
  84     ProbeLibDVDCSS();
  85 #endif
  86 MODULE_ACTIVATE_STOP
  87
  88 MODULE_DEACTIVATE_START
  89 #ifdef GOD_DAMN_DMCA
  90     UnprobeLibDVDCSS();
  91 #endif
  92 MODULE_DEACTIVATE_STOP
  93
  94
  95 /* Following functions are local */
  96
  97 #ifdef GOD_DAMN_DMCA
  98 /*****************************************************************************
  99  * ProbeLibDVDCSS: look for a libdvdcss object.
 100  *****************************************************************************
 101  * This functions looks for libdvdcss, using dlopen(), and fills function
 102  * pointers with what it finds. On failure, uses the dummy libdvdcss
 103  * replacement provided by vlc.
 104  *****************************************************************************/
 105 static void ProbeLibDVDCSS( void )
 106 {
 107     char *pp_filelist[4] = { "libdvdcss.so.0",
 108                              "./libdvdcss.so.0",
 109                              "./lib/libdvdcss.so.0",
 110                              NULL };
 111     char **pp_file = pp_filelist;
 112
 113     /* Try to open the dynamic object */
 114     do
 115     {
 116         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 117         if( p_libdvdcss != NULL )
 118         {
 119             intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 120                              "in `%s'", *pp_file );
 121             break;
 122         }
 123         pp_file++;
 124
 125     } while( *pp_file != NULL );
 126
 127     /* If libdvdcss.so was found, check that it's valid */
 128     if( p_libdvdcss == NULL )
 129     {
 130         intf_ErrMsg( "dvd warning: libdvdcss.so.0 not present" );
 131     }
 132     else
 133     {
 134         /* Check for libdvdcss 0.0.1 */
 135         if( dlsym( p_libdvdcss, "dvdcss_crack" ) != NULL )
 136         {
 137             intf_ErrMsg( "dvd warning: libdvdcss.so.0 has deprecated symbol "
 138                          "dvdcss_crack(), please upgrade" );
 139             dlclose( p_libdvdcss );
 140             p_libdvdcss = NULL;
 141         }
 142         else
 143         {
 144             dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
 145             dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
 146             dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
 147             dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
 148             dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
 149             dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
 150             dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
 151
 152             if( dvdcss_open == NULL || dvdcss_close == NULL
 153                  || dvdcss_title == NULL || dvdcss_seek == NULL
 154                  || dvdcss_read == NULL || dvdcss_readv == NULL
 155                  || dvdcss_error == NULL )
 156             {
 157                 intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.0, "
 158                              "please upgrade libdvdcss or vlc" );
 159                 dlclose( p_libdvdcss );
 160                 p_libdvdcss = NULL;
 161             }
 162         }
 163     }
 164
 165     /* If libdvdcss was not found or was not valid, use the dummy
 166      * replacement functions. */
 167     if( p_libdvdcss == NULL )
 168     {
 169         intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 170                      "I will only play unencrypted DVDs" );
 171         intf_ErrMsg( "dvd warning: get libdvdcss at "
 172                      "http://www.videolan.org/libdvdcss/" );
 173
 174         dvdcss_open = dummy_dvdcss_open;
 175         dvdcss_close = dummy_dvdcss_close;
 176         dvdcss_title = dummy_dvdcss_title;
 177         dvdcss_seek = dummy_dvdcss_seek;
 178         dvdcss_read = dummy_dvdcss_read;
 179         dvdcss_readv = dummy_dvdcss_readv;
 180         dvdcss_error = dummy_dvdcss_error;
 181     }
 182 }
 183
 184 /*****************************************************************************
 185  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 186  *****************************************************************************/
 187 static void UnprobeLibDVDCSS( void )
 188 {
 189     if( p_libdvdcss != NULL )
 190     {
 191         dlclose( p_libdvdcss );
 192         p_libdvdcss = NULL;
 193     }
 194 }
 195 #endif
 196