1 /*****************************************************************************
2 * dvd.c : DVD input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2001 VideoLAN
5 * $Id: dvd.c,v 1.4 2003/01/28 22:03:21 sam 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_category_hint( N_("[dvd:][device][@raw_device][@[title][,[chapter][,angle]]]"), NULL );
87 add_string_from_list( "dvdcss-method", NULL, cssmethod_list, NULL,
88 CSSMETHOD_TEXT, CSSMETHOD_LONGTEXT );
90 set_description( _("DVD input module, uses libdvdcss if installed") );
93 set_description( _("DVD input module, uses libdvdcss") );
96 add_shortcut( "dvdold" );
98 set_capability( "access", i );
99 set_callbacks( E_(DVDOpen), E_(DVDClose) );
101 set_capability( "demux", 0 );
102 set_callbacks( E_(DVDInit), E_(DVDEnd) );
112 /* Following functions are local */
115 /*****************************************************************************
116 * ProbeLibDVDCSS: look for a libdvdcss object.
117 *****************************************************************************
118 * This functions looks for libdvdcss, using dlopen(), and fills function
119 * pointers with what it finds. On failure, uses the dummy libdvdcss
120 * replacement provided by vlc.
121 *****************************************************************************/
122 static void ProbeLibDVDCSS( void )
124 static char *pp_filelist[] = { "libdvdcss.so.2",
126 "./lib/libdvdcss.so.2",
129 "./lib/libdvdcss.so.1",
131 char **pp_file = pp_filelist;
133 /* Try to open the dynamic object */
136 p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
137 if( p_libdvdcss != NULL )
139 //X intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
140 //X "in `%s'", *pp_file );
145 } while( *pp_file != NULL );
147 /* If libdvdcss.so was found, check that it's valid */
148 if( p_libdvdcss == NULL )
150 //X intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
154 ____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
155 ____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
156 ____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
157 ____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
158 ____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
159 ____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
160 ____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
162 if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
163 || ____dvdcss_title == NULL || ____dvdcss_seek == NULL
164 || ____dvdcss_read == NULL || ____dvdcss_readv == NULL
165 || ____dvdcss_error == NULL )
167 //X intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
168 //X "this shouldn't happen !" );
169 dlclose( p_libdvdcss );
174 /* If libdvdcss was not found or was not valid, use the dummy
175 * replacement functions. */
176 if( p_libdvdcss == NULL )
178 //X intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
179 //X "I will only play unencrypted DVDs" );
180 //X intf_ErrMsg( "dvd warning: get libdvdcss at "
181 //X "http://www.videolan.org/libdvdcss/" );
183 ____dvdcss_open = dummy_dvdcss_open;
184 ____dvdcss_close = dummy_dvdcss_close;
185 ____dvdcss_title = dummy_dvdcss_title;
186 ____dvdcss_seek = dummy_dvdcss_seek;
187 ____dvdcss_read = dummy_dvdcss_read;
188 ____dvdcss_readv = dummy_dvdcss_readv;
189 ____dvdcss_error = dummy_dvdcss_error;
193 /*****************************************************************************
194 * UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
195 *****************************************************************************/
196 static void UnprobeLibDVDCSS( void )
198 if( p_libdvdcss != NULL )
200 dlclose( p_libdvdcss );
205 /* Dummy libdvdcss with minimal DVD access. */
207 /*****************************************************************************
209 *****************************************************************************/
212 /* File descriptor */
216 /*****************************************************************************
217 * dvdcss_open: initialize library, open a DVD device, crack CSS key
218 *****************************************************************************/
219 extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
221 dvdcss_handle dvdcss;
224 /* Allocate the library structure */
225 dvdcss = malloc( sizeof( struct dvdcss_s ) );
228 fprintf( stderr, "dvd error: "
229 "dummy libdvdcss could not allocate memory\n" );
233 /* Open the device */
234 dvdcss->i_fd = open( psz_target, 0 );
235 if( dvdcss->i_fd < 0 )
237 fprintf( stderr, "dvd error: "
238 "dummy libdvdcss could not open device\n" );
243 /* Check for encryption or ioctl failure */
244 dvd.type = DVD_STRUCT_COPYRIGHT;
245 dvd.copyright.layer_num = 0;
246 if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
247 || dvd.copyright.cpst )
249 fprintf( stderr, "dvd error: "
250 "dummy libdvdcss could not decrypt disc\n" );
251 close( dvdcss->i_fd );
259 /*****************************************************************************
260 * dvdcss_error: return the last libdvdcss error message
261 *****************************************************************************/
262 extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
264 return "generic error";
267 /*****************************************************************************
268 * dvdcss_seek: seek into the device
269 *****************************************************************************/
270 extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
275 i_read = lseek( dvdcss->i_fd,
276 (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
278 return i_read / DVDCSS_BLOCK_SIZE;
281 /*****************************************************************************
282 * dvdcss_title: crack the current title key if needed
283 *****************************************************************************/
284 extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
289 /*****************************************************************************
290 * dvdcss_read: read data from the device, decrypt if requested
291 *****************************************************************************/
292 extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
298 i_bytes = read( dvdcss->i_fd, p_buffer,
299 (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
301 return i_bytes / DVDCSS_BLOCK_SIZE;
304 /*****************************************************************************
305 * dvdcss_readv: read data to an iovec structure, decrypt if reaquested
306 *****************************************************************************/
307 extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
313 i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
315 return i_read / DVDCSS_BLOCK_SIZE;
318 /*****************************************************************************
319 * dvdcss_close: close the DVD device and clean up the library
320 *****************************************************************************/
321 extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
325 i_ret = close( dvdcss->i_fd );