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 1.34 2002/07/31 20:56:51 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 <vlc/vlc.h>
  31
  32 #ifdef GOD_DAMN_DMCA
  33 #   include <stdio.h>
  34 #   include <fcntl.h>
  35 #   include <unistd.h>
  36 #   include <sys/types.h>
  37 #   include <sys/stat.h>
  38 #   include <sys/uio.h>                                      /* struct iovec */
  39 #   include <sys/ioctl.h>
  40 #   include <dlfcn.h>
  41 #   include <netinet/in.h>
  42 #   include <linux/cdrom.h>
  43
  44 #   include "dummy_dvdcss.h"
  45 #endif
  46
  47 /*****************************************************************************
  48  * Local prototypes.
  49  *****************************************************************************/
  50 int  E_(DVDOpen)   ( vlc_object_t * );
  51 void E_(DVDClose)  ( vlc_object_t * );
  52
  53 int  E_(DVDInit)   ( vlc_object_t * );
  54
  55 #ifdef GOD_DAMN_DMCA
  56 static void *p_libdvdcss;
  57 static void ProbeLibDVDCSS  ( void );
  58 static void UnprobeLibDVDCSS( void );
  59 #endif
  60
  61 /*****************************************************************************
  62  * Module descriptor
  63  *****************************************************************************/
  64 vlc_module_begin();
  65     int i;
  66     add_category_hint( N_("[dvd:][device][@raw_device][@[title][,[chapter][,angle]]]"), NULL );
  67 #ifdef GOD_DAMN_DMCA
  68     set_description( _("DVD input module, uses libdvdcss if installed") );
  69     i = 90;
  70 #else
  71     set_description( _("DVD input module, uses libdvdcss") );
  72     i = 100;
  73 #endif
  74     add_shortcut( "dvdold" );
  75     add_submodule();
  76         set_capability( "access", i );
  77         set_callbacks( E_(DVDOpen), E_(DVDClose) );
  78     add_submodule();
  79         set_capability( "demux", 0 );
  80         set_callbacks( E_(DVDInit), NULL );
  81 #ifdef GOD_DAMN_DMCA
  82     ProbeLibDVDCSS();
  83 #endif
  84 vlc_module_end();
  85
  86 #if 0 /* FIXME */
  87     UnprobeLibDVDCSS();
  88 #endif
  89
  90 /* Following functions are local */
  91
  92 #ifdef GOD_DAMN_DMCA
  93 /*****************************************************************************
  94  * ProbeLibDVDCSS: look for a libdvdcss object.
  95  *****************************************************************************
  96  * This functions looks for libdvdcss, using dlopen(), and fills function
  97  * pointers with what it finds. On failure, uses the dummy libdvdcss
  98  * replacement provided by vlc.
  99  *****************************************************************************/
 100 static void ProbeLibDVDCSS( void )
 101 {
 102     static char *pp_filelist[] = { "libdvdcss.so.2",
 103                                    "./libdvdcss.so.2",
 104                                    "./lib/libdvdcss.so.2",
 105                                    "libdvdcss.so.1",
 106                                    "./libdvdcss.so.1",
 107                                    "./lib/libdvdcss.so.1",
 108                                    NULL };
 109     char **pp_file = pp_filelist;
 110
 111     /* Try to open the dynamic object */
 112     do
 113     {
 114         p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
 115         if( p_libdvdcss != NULL )
 116         {
 117 //X            intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
 118 //X                             "in `%s'", *pp_file );
 119             break;
 120         }
 121         pp_file++;
 122
 123     } while( *pp_file != NULL );
 124
 125     /* If libdvdcss.so was found, check that it's valid */
 126     if( p_libdvdcss == NULL )
 127     {
 128 //X        intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
 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 //X            intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
 146 //X                         "this shouldn't happen !" );
 147             dlclose( p_libdvdcss );
 148             p_libdvdcss = NULL;
 149         }
 150     }
 151
 152     /* If libdvdcss was not found or was not valid, use the dummy
 153      * replacement functions. */
 154     if( p_libdvdcss == NULL )
 155     {
 156 //X        intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
 157 //X                     "I will only play unencrypted DVDs" );
 158 //X        intf_ErrMsg( "dvd warning: get libdvdcss at "
 159 //X                     "http://www.videolan.org/libdvdcss/" );
 160
 161         ____dvdcss_open = dummy_dvdcss_open;
 162         ____dvdcss_close = dummy_dvdcss_close;
 163         ____dvdcss_title = dummy_dvdcss_title;
 164         ____dvdcss_seek = dummy_dvdcss_seek;
 165         ____dvdcss_read = dummy_dvdcss_read;
 166         ____dvdcss_readv = dummy_dvdcss_readv;
 167         ____dvdcss_error = dummy_dvdcss_error;
 168     }
 169 }
 170
 171 /*****************************************************************************
 172  * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
 173  *****************************************************************************/
 174 static void UnprobeLibDVDCSS( void )
 175 {
 176     if( p_libdvdcss != NULL )
 177     {
 178         dlclose( p_libdvdcss );
 179         p_libdvdcss = NULL;
 180     }
 181 }
 182
 183 /* Dummy libdvdcss with minimal DVD access. */
 184
 185 /*****************************************************************************
 186  * Local structure
 187  *****************************************************************************/
 188 struct dvdcss_s
 189 {
 190     /* File descriptor */
 191     int i_fd;
 192 };
 193
 194 /*****************************************************************************
 195  * dvdcss_open: initialize library, open a DVD device, crack CSS key
 196  *****************************************************************************/
 197 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
 198 {
 199     dvdcss_handle dvdcss;
 200     dvd_struct    dvd;
 201
 202     /* Allocate the library structure */
 203     dvdcss = malloc( sizeof( struct dvdcss_s ) );
 204     if( dvdcss == NULL )
 205     {
 206         fprintf( stderr, "dvd error: "
 207                          "dummy libdvdcss could not allocate memory\n" );
 208         return NULL;
 209     }
 210
 211     /* Open the device */
 212     dvdcss->i_fd = open( psz_target, 0 );
 213     if( dvdcss->i_fd < 0 )
 214     {
 215         fprintf( stderr, "dvd error: "
 216                          "dummy libdvdcss could not open device\n" );
 217         free( dvdcss );
 218         return NULL;
 219     }
 220
 221     /* Check for encryption or ioctl failure */
 222     dvd.type = DVD_STRUCT_COPYRIGHT;
 223     dvd.copyright.layer_num = 0;
 224     if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
 225          || dvd.copyright.cpst )
 226     {
 227         fprintf( stderr, "dvd error: "
 228                          "dummy libdvdcss could not decrypt disc\n" );
 229         close( dvdcss->i_fd );
 230         free( dvdcss );
 231         return NULL;
 232     }
 233
 234     return dvdcss;
 235 }
 236
 237 /*****************************************************************************
 238  * dvdcss_error: return the last libdvdcss error message
 239  *****************************************************************************/
 240 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
 241 {
 242     return "generic error";
 243 }
 244
 245 /*****************************************************************************
 246  * dvdcss_seek: seek into the device
 247  *****************************************************************************/
 248 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
 249                                                      int i_flags )
 250 {
 251     off_t i_read;
 252
 253     i_read = lseek( dvdcss->i_fd,
 254                     (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
 255
 256     return i_read / DVDCSS_BLOCK_SIZE;
 257 }
 258
 259 /*****************************************************************************
 260  * dvdcss_title: crack the current title key if needed
 261  *****************************************************************************/
 262 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
 263 {
 264     return 0;
 265 }
 266
 267 /*****************************************************************************
 268  * dvdcss_read: read data from the device, decrypt if requested
 269  *****************************************************************************/
 270 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
 271                                                      int i_blocks,
 272                                                      int i_flags )
 273 {
 274     int i_bytes;
 275
 276     i_bytes = read( dvdcss->i_fd, p_buffer,
 277                     (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
 278
 279     return i_bytes / DVDCSS_BLOCK_SIZE;
 280 }
 281
 282 /*****************************************************************************
 283  * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
 284  *****************************************************************************/
 285 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
 286                                                       int i_blocks,
 287                                                       int i_flags )
 288 {
 289     int i_read;
 290
 291     i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
 292
 293     return i_read / DVDCSS_BLOCK_SIZE;
 294 }
 295
 296 /*****************************************************************************
 297  * dvdcss_close: close the DVD device and clean up the library
 298  *****************************************************************************/
 299 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
 300 {
 301     int i_ret;
 302
 303     i_ret = close( dvdcss->i_fd );
 304
 305     if( i_ret < 0 )
 306     {
 307         return i_ret;
 308     }
 309
 310     free( dvdcss );
 311
 312     return 0;
 313 }
 314
 315 #endif
 316