1 /*****************************************************************************
2 * dvd.c : DVD input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2001 VideoLAN
5 * $Id: dvd.c,v 1.5 2003/02/20 01:52:45 sigmunau Exp $
7 * Authors: Samuel Hocevar <sam@zoy.org>
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.
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.
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 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
28 #include <string.h> /* strdup() */
36 # include <sys/types.h>
37 # include <sys/stat.h>
38 # include <sys/uio.h> /* struct iovec */
39 # include <sys/ioctl.h>
41 # include <netinet/in.h>
42 # include <linux/cdrom.h>
47 /*****************************************************************************
49 *****************************************************************************/
50 int E_(DVDOpen) ( vlc_object_t * );
51 void E_(DVDClose) ( vlc_object_t * );
53 int E_(DVDInit) ( vlc_object_t * );
54 void E_(DVDEnd) ( vlc_object_t * );
57 static void *p_libdvdcss;
58 static void ProbeLibDVDCSS ( void );
59 static void UnprobeLibDVDCSS( void );
62 /*****************************************************************************
64 *****************************************************************************/
65 #define CSSMETHOD_TEXT N_("method to use by libdvdcss for key decryption")
66 #define CSSMETHOD_LONGTEXT N_( \
67 "Set the method used by libdvdcss for key decryption.\n" \
68 "title: decrypted title key is guessed from the encrypted sectors of " \
69 "the stream. Thus it should work with a file as well as the " \
70 "DVD device. But it sometimes takes much time to decrypt a title " \
71 "key and may even fail. With this method, the key is only checked "\
72 "at the beginning of each title, so it won't work if the key " \
73 "changes in the middle of a title.\n" \
74 "disc: the disc key is first cracked, then all title keys can be " \
75 "decrypted instantly, which allows us to check them often.\n" \
76 "key: the same as \"disc\" if you don't have a file with player keys " \
77 "at compilation time. If you do, the decryption of the disc key " \
78 "will be faster with this method. It is the one that was used by " \
80 "The default method is: key.")
82 static char *cssmethod_list[] = { "title", "disc", "key", NULL };
86 add_usage_hint( N_("[dvd:][device][@raw_device][@[title][,[chapter][,angle]]]") );
87 add_category_hint( N_("dvd"), NULL, VLC_TRUE );
88 add_string_from_list( "dvdcss-method", NULL, cssmethod_list, NULL,
89 CSSMETHOD_TEXT, CSSMETHOD_LONGTEXT, VLC_TRUE );
91 set_description( _("DVD input module, uses libdvdcss if installed") );
94 set_description( _("DVD input module, uses libdvdcss") );
97 add_shortcut( "dvdold" );
99 set_capability( "access", i );
100 set_callbacks( E_(DVDOpen), E_(DVDClose) );
102 set_capability( "demux", 0 );
103 set_callbacks( E_(DVDInit), E_(DVDEnd) );
113 /* Following functions are local */
116 /*****************************************************************************
117 * ProbeLibDVDCSS: look for a libdvdcss object.
118 *****************************************************************************
119 * This functions looks for libdvdcss, using dlopen(), and fills function
120 * pointers with what it finds. On failure, uses the dummy libdvdcss
121 * replacement provided by vlc.
122 *****************************************************************************/
123 static void ProbeLibDVDCSS( void )
125 static char *pp_filelist[] = { "libdvdcss.so.2",
127 "./lib/libdvdcss.so.2",
130 "./lib/libdvdcss.so.1",
132 char **pp_file = pp_filelist;
134 /* Try to open the dynamic object */
137 p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
138 if( p_libdvdcss != NULL )
140 //X intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
141 //X "in `%s'", *pp_file );
146 } while( *pp_file != NULL );
148 /* If libdvdcss.so was found, check that it's valid */
149 if( p_libdvdcss == NULL )
151 //X intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
155 ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
156 ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
157 ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
158 ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
159 ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
160 ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
161 ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
163 if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
164 || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
165 || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
166 || ____dvdcss_error == NULL )
168 //X intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
169 //X "this shouldn't happen !" );
170 dlclose( p_libdvdcss );
175 /* If libdvdcss was not found or was not valid, use the dummy
176 * replacement functions. */
177 if( p_libdvdcss == NULL )
179 //X intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
180 //X "I will only play unencrypted DVDs" );
181 //X intf_ErrMsg( "dvd warning: get libdvdcss at "
182 //X "http://www.videolan.org/libdvdcss/" );
184 ____dvdcss_open = dummy_dvdcss_open;
185 ____dvdcss_close = dummy_dvdcss_close;
186 ____dvdcss_title = dummy_dvdcss_title;
187 ____dvdcss_seek = dummy_dvdcss_seek;
188 ____dvdcss_read = dummy_dvdcss_read;
189 ____dvdcss_readv = dummy_dvdcss_readv;
190 ____dvdcss_error = dummy_dvdcss_error;
194 /*****************************************************************************
195 * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
196 *****************************************************************************/
197 static void UnprobeLibDVDCSS( void )
199 if( p_libdvdcss != NULL )
201 dlclose( p_libdvdcss );
206 /* Dummy libdvdcss with minimal DVD access. */
208 /*****************************************************************************
210 *****************************************************************************/
213 /* File descriptor */
217 /*****************************************************************************
218 * dvdcss_open: initialize library, open a DVD device, crack CSS key
219 *****************************************************************************/
220 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
222 dvdcss_handle dvdcss;
225 /* Allocate the library structure */
226 dvdcss = malloc( sizeof( struct dvdcss_s ) );
229 fprintf( stderr, "dvd error: "
230 "dummy libdvdcss could not allocate memory\n" );
234 /* Open the device */
235 dvdcss->i_fd = open( psz_target, 0 );
236 if( dvdcss->i_fd < 0 )
238 fprintf( stderr, "dvd error: "
239 "dummy libdvdcss could not open device\n" );
244 /* Check for encryption or ioctl failure */
245 dvd.type = DVD_STRUCT_COPYRIGHT;
246 dvd.copyright.layer_num = 0;
247 if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
248 || dvd.copyright.cpst )
250 fprintf( stderr, "dvd error: "
251 "dummy libdvdcss could not decrypt disc\n" );
252 close( dvdcss->i_fd );
260 /*****************************************************************************
261 * dvdcss_error: return the last libdvdcss error message
262 *****************************************************************************/
263 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
265 return "generic error";
268 /*****************************************************************************
269 * dvdcss_seek: seek into the device
270 *****************************************************************************/
271 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
276 i_read = lseek( dvdcss->i_fd,
277 (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
279 return i_read / DVDCSS_BLOCK_SIZE;
282 /*****************************************************************************
283 * dvdcss_title: crack the current title key if needed
284 *****************************************************************************/
285 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
290 /*****************************************************************************
291 * dvdcss_read: read data from the device, decrypt if requested
292 *****************************************************************************/
293 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
299 i_bytes = read( dvdcss->i_fd, p_buffer,
300 (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
302 return i_bytes / DVDCSS_BLOCK_SIZE;
305 /*****************************************************************************
306 * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
307 *****************************************************************************/
308 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
314 i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
316 return i_read / DVDCSS_BLOCK_SIZE;
319 /*****************************************************************************
320 * dvdcss_close: close the DVD device and clean up the library
321 *****************************************************************************/
322 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
326 i_ret = close( dvdcss->i_fd );