git.sesse.net Git - vlc/blob - modules/access/dvd/access.c

   1 /* access.c: DVD access plugin.
   2  *****************************************************************************
   3  * This plugins should handle all the known specificities of the DVD format,
   4  * especially the 2048 bytes logical block size.
   5  * It depends on:
   6  *  -libdvdcss for access and unscrambling
   7  *  -ifo.* for ifo parsing and analyse
   8  *  -udf.* to find files
   9  *****************************************************************************
  10  * Copyright (C) 1998-2001 VideoLAN
  11  * $Id: access.c,v 1.12 2003/03/24 17:15:29 gbazin Exp $
  12  *
  13  * Author: Stéphane Borel <stef@via.ecp.fr>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  28  *****************************************************************************/
  29
  30 /*****************************************************************************
  31  * Preamble
  32  *****************************************************************************/
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include <vlc/vlc.h>
  38 #include <vlc/input.h>
  39
  40 #include "../../demux/mpeg/system.h"
  41
  42 #ifdef HAVE_UNISTD_H
  43 #   include <unistd.h>
  44 #endif
  45
  46 #include <fcntl.h>
  47 #include <sys/types.h>
  48 #include <sys/stat.h>
  49 #include <string.h>
  50 #include <errno.h>
  51
  52 #ifdef STRNCASECMP_IN_STRINGS_H
  53 #   include <strings.h>
  54 #endif
  55
  56 #ifdef GOD_DAMN_DMCA
  57 #   include "dvdcss.h"
  58 #else
  59 #   include <dvdcss/dvdcss.h>
  60 #endif
  61
  62 #include "dvd.h"
  63 #include "es.h"
  64 #include "seek.h"
  65 #include "ifo.h"
  66 #include "summary.h"
  67 #include "iso_lang.h"
  68
  69 /*****************************************************************************
  70  * Local prototypes
  71  *****************************************************************************/
  72
  73 /* called from outside */
  74 static int  DVDSetArea      ( input_thread_t *, input_area_t * );
  75 static int  DVDSetProgram   ( input_thread_t *, pgrm_descriptor_t * );
  76 static ssize_t DVDRead      ( input_thread_t *, byte_t *, size_t );
  77 static void DVDSeek         ( input_thread_t *, off_t );
  78
  79 static char * DVDParse( input_thread_t * );
  80
  81 /*
  82  * Data access functions
  83  */
  84
  85 #define DVDTell   LB2OFF( p_dvd->i_vts_start + p_dvd->i_vts_lb ) \
  86                   - p_input->stream.p_selected_area->i_start
  87
  88 /*****************************************************************************
  89  * DVDOpen: open dvd
  90  *****************************************************************************/
  91 int E_(DVDOpen) ( vlc_object_t *p_this )
  92 {
  93     input_thread_t *     p_input = (input_thread_t *)p_this;
  94     char *               psz_device;
  95     thread_dvd_data_t *  p_dvd;
  96     input_area_t *       p_area;
  97     int                  i;
  98     char *               psz_dvdcss_env;
  99
 100     p_dvd = malloc( sizeof(thread_dvd_data_t) );
 101     if( p_dvd == NULL )
 102     {
 103         msg_Err( p_input, "out of memory" );
 104         return -1;
 105     }
 106     p_input->p_access_data = (void *)p_dvd;
 107
 108     p_input->pf_read = DVDRead;
 109     p_input->pf_seek = DVDSeek;
 110     p_input->pf_set_area = DVDSetArea;
 111     p_input->pf_set_program = DVDSetProgram;
 112
 113     /* Parse command line */
 114     if( !( psz_device = DVDParse( p_input ) ) )
 115     {
 116         free( p_dvd );
 117         return -1;
 118     }
 119
 120     /*
 121      * set up input
 122      */
 123     p_input->i_mtu = 0;
 124
 125     /* override environment variable DVDCSS_METHOD with config option
 126      * (FIXME: this creates a small memory leak) */
 127     psz_dvdcss_env = config_GetPsz( p_input, "dvdcss-method" );
 128     if( psz_dvdcss_env && *psz_dvdcss_env )
 129     {
 130         char *psz_env;
 131
 132         psz_env = malloc( strlen("DVDCSS_METHOD=") +
 133                           strlen( psz_dvdcss_env ) + 1 );
 134
 135         if( !psz_env )
 136         {
 137             free( p_dvd );
 138             return -1;
 139         }
 140
 141         sprintf( psz_env, "%s%s", "DVDCSS_METHOD=", psz_dvdcss_env );
 142
 143         putenv( psz_env );
 144     }
 145     if( psz_dvdcss_env ) free( psz_dvdcss_env );
 146
 147     /*
 148      *  get plugin ready
 149      */
 150     p_dvd->dvdhandle = dvdcss_open( psz_device );
 151
 152     /* free allocated string */
 153     free( psz_device );
 154
 155     if( p_dvd->dvdhandle == NULL )
 156     {
 157         msg_Err( p_input, "dvdcss cannot open device" );
 158         free( p_dvd );
 159         return -1;
 160     }
 161
 162     if( dvdcss_seek( p_dvd->dvdhandle, 0, DVDCSS_NOFLAGS ) < 0 )
 163     {
 164         msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 165         dvdcss_close( p_dvd->dvdhandle );
 166         free( p_dvd );
 167         return -1;
 168     }
 169
 170     /* Ifo allocation & initialisation */
 171     if( IfoCreate( p_dvd ) < 0 )
 172     {
 173         msg_Err( p_input, "allcation error in ifo" );
 174         dvdcss_close( p_dvd->dvdhandle );
 175         free( p_dvd );
 176         return -1;
 177     }
 178
 179     if( IfoInit( p_dvd->p_ifo ) < 0 )
 180     {
 181         msg_Err( p_input, "fatal failure in ifo" );
 182         IfoDestroy( p_dvd->p_ifo );
 183         dvdcss_close( p_dvd->dvdhandle );
 184         free( p_dvd );
 185         return -1;
 186     }
 187
 188     /* Set stream and area data */
 189     vlc_mutex_lock( &p_input->stream.stream_lock );
 190
 191     p_input->stream.i_method = INPUT_METHOD_DVD;
 192     p_input->stream.b_pace_control = 1;
 193     p_input->stream.b_seekable = 1;
 194     p_input->stream.p_selected_area->i_size = 0;
 195     p_input->stream.p_selected_area->i_tell = 0;
 196
 197     /* Initialize ES structures */
 198     input_InitStream( p_input, sizeof( stream_ps_data_t ) );
 199
 200 #define title_inf p_dvd->p_ifo->vmg.title_inf
 201     msg_Dbg( p_input, "number of titles: %d", title_inf.i_title_nb );
 202
 203 #define area p_input->stream.pp_areas
 204     /* We start from 1 here since the default area 0
 205      * is reserved for video_ts.vob */
 206     for( i = 1 ; i <= title_inf.i_title_nb ; i++ )
 207     {
 208         /* Titles are Program Chains */
 209         input_AddArea( p_input, i, title_inf.p_attr[i-1].i_chapter_nb );
 210
 211         /* Absolute start offset and size
 212          * We can only set that with vts ifo, so we do it during the
 213          * first call to DVDSetArea */
 214         area[i]->i_start = 0;
 215         area[i]->i_size = 0;
 216
 217         /* Default Chapter */
 218         area[i]->i_part = 1;
 219
 220         /* Offset to vts_i_0.ifo */
 221         area[i]->i_plugin_data = p_dvd->p_ifo->i_start +
 222                        title_inf.p_attr[i-1].i_start_sector;
 223     }
 224 #undef area
 225
 226     p_dvd->i_title = p_dvd->i_title <= title_inf.i_title_nb ?
 227                      p_dvd->i_title : 1;
 228 #undef title_inf
 229
 230     p_area = p_input->stream.pp_areas[p_dvd->i_title];
 231
 232     p_area->i_part = p_dvd->i_chapter <= p_area->i_part_nb ?
 233                      p_dvd->i_chapter : 1;
 234     p_dvd->i_chapter = 1;
 235
 236     p_dvd->b_new_chapter = 0;
 237     p_dvd->i_audio_nb = 0;
 238     p_dvd->i_spu_nb = 0;
 239
 240     /* set title, chapter, audio and subpic */
 241     if( DVDSetArea( p_input, p_area ) < 0 )
 242     {
 243         vlc_mutex_unlock( &p_input->stream.stream_lock );
 244         IfoDestroy( p_dvd->p_ifo );
 245         dvdcss_close( p_dvd->dvdhandle );
 246         free( p_dvd );
 247         return -1;
 248     }
 249
 250     vlc_mutex_unlock( &p_input->stream.stream_lock );
 251
 252     if( !p_input->psz_demux || !*p_input->psz_demux )
 253     {
 254         p_input->psz_demux = "dvdold";
 255     }
 256
 257     return 0;
 258 }
 259
 260 /*****************************************************************************
 261  * DVDClose: close dvd
 262  *****************************************************************************/
 263 void E_(DVDClose) ( vlc_object_t *p_this )
 264 {
 265     input_thread_t * p_input = (input_thread_t *)p_this;
 266     thread_dvd_data_t *p_dvd = (thread_dvd_data_t*)p_input->p_access_data;
 267
 268     /* This is a very nasty side-effect in the DVD plug-in : language
 269      * selection here influences language selection of other streams. So
 270      * unset those variables (may not be what the user wants).
 271      * FIXME FIXME FIXME FIXME FIXME FIXME FIXME --Meuuh */
 272     config_PutInt( p_input, "audio-channel", -1 );
 273     config_PutInt( p_input, "spu-channel", -1 );
 274
 275     IfoDestroy( p_dvd->p_ifo );
 276     dvdcss_close( p_dvd->dvdhandle );
 277     free( p_dvd );
 278 }
 279
 280 /*****************************************************************************
 281  * DVDSetProgram: used to change angle
 282  *****************************************************************************/
 283 static int DVDSetProgram( input_thread_t    * p_input,
 284                           pgrm_descriptor_t * p_program )
 285 {
 286     if( p_input->stream.p_selected_program != p_program )
 287     {
 288         thread_dvd_data_t *  p_dvd;
 289         int                  i_angle;
 290         vlc_value_t          val;
 291
 292         p_dvd   = (thread_dvd_data_t*)(p_input->p_access_data);
 293         i_angle = p_program->i_number;
 294
 295         /* DVD is actually mono-program: we only need the current angle
 296          * number, so copy the data between programs */
 297         memcpy( p_program,
 298                 p_input->stream.p_selected_program,
 299                 sizeof(pgrm_descriptor_t) );
 300         p_program->i_number                = i_angle;
 301         p_input->stream.p_selected_program = p_program;
 302
 303 #define title \
 304     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 305         if( title.p_cell_play[p_dvd->i_prg_cell].i_category & 0xf000 )
 306         {
 307             if( ( p_program->i_number - p_dvd->i_angle ) < 0 )
 308             {
 309                 /* we have to go backwards */
 310                 p_dvd->i_map_cell = 0;
 311             }
 312             p_dvd->i_prg_cell += ( p_program->i_number - p_dvd->i_angle );
 313             p_dvd->i_map_cell =  CellPrg2Map( p_dvd );
 314             p_dvd->i_map_cell += p_dvd->i_angle_cell;
 315             p_dvd->i_vts_lb   =  CellFirstSector( p_dvd );
 316             p_dvd->i_last_lb  =  CellLastSector( p_dvd );
 317             p_dvd->i_angle    =  p_program->i_number;
 318         }
 319         else
 320         {
 321             p_dvd->i_angle    =  p_program->i_number;
 322         }
 323 #undef title
 324         msg_Dbg( p_input, "angle %d selected", p_dvd->i_angle );
 325
 326         /* Update the navigation variables without triggering a callback */
 327         val.i_int = p_program->i_number;
 328         var_Change( p_input, "program", VLC_VAR_SETVALUE, &val );
 329     }
 330
 331     return 0;
 332 }
 333
 334 /*****************************************************************************
 335  * DVDSetArea: initialize input data for title x, chapter y.
 336  * It should be called for each user navigation request.
 337  *****************************************************************************
 338  * Take care that i_title starts from 0 (vmg) and i_chapter start from 1.
 339  * Note that you have to take the lock before entering here.
 340  *****************************************************************************/
 341 #define vmg p_dvd->p_ifo->vmg
 342 #define vts p_dvd->p_ifo->vts
 343
 344 static void DVDFlushStream( input_thread_t * p_input )
 345 {
 346     if( p_input->stream.pp_programs != NULL )
 347     {
 348         /* We don't use input_EndStream here since
 349          * we keep area structures */
 350         while( p_input->stream.i_es_number )
 351         {
 352             input_DelES( p_input, p_input->stream.pp_es[0] );
 353         }
 354
 355         while( p_input->stream.i_pgrm_number )
 356         {
 357             input_DelProgram( p_input, p_input->stream.pp_programs[0] );
 358         }
 359
 360         if( p_input->stream.pp_selected_es )
 361         {
 362             free( p_input->stream.pp_selected_es );
 363             p_input->stream.pp_selected_es = NULL;
 364         }
 365         p_input->stream.i_selected_es_number = 0;
 366     }
 367
 368     return;
 369 }
 370
 371 static int DVDReadAngle( input_thread_t * p_input )
 372 {
 373     thread_dvd_data_t * p_dvd;
 374     int                 i_angle_nb;
 375     int                 i;
 376
 377     p_dvd      = (thread_dvd_data_t*)(p_input->p_access_data);
 378     i_angle_nb = vmg.title_inf.p_attr[p_dvd->i_title-1].i_angle_nb;
 379
 380     input_AddProgram( p_input, 1, sizeof( stream_ps_data_t ) );
 381     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 382
 383     for( i = 1 ; i < i_angle_nb ; i++ )
 384     {
 385         input_AddProgram( p_input, i+1, 0 );
 386     }
 387
 388     return i_angle_nb;
 389 }
 390
 391 static int DVDSetArea( input_thread_t * p_input, input_area_t * p_area )
 392 {
 393     thread_dvd_data_t *  p_dvd;
 394     vlc_value_t          val;
 395
 396     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 397
 398     /* we can't use the interface slider until initilization is complete */
 399     p_input->stream.b_seekable = 0;
 400
 401     if( p_area != p_input->stream.p_selected_area )
 402     {
 403         int     i_vts_title;
 404         u32     i_first;
 405         u32     i_last;
 406         unsigned int i;
 407
 408         /* Reset the Chapter position of the old title */
 409         p_input->stream.p_selected_area->i_part = 1;
 410         p_input->stream.p_selected_area         = p_area;
 411
 412         /*
 413          *  We have to load all title information
 414          */
 415
 416         /* title number as it appears in the interface list */
 417         p_dvd->i_title      = p_area->i_id;
 418         p_dvd->i_chapter_nb = p_area->i_part_nb;
 419
 420         if( IfoTitleSet( p_dvd->p_ifo, p_dvd->i_title ) < 0 )
 421         {
 422             msg_Err( p_input, "fatal error in vts ifo" );
 423             free( p_dvd );
 424             return -1;
 425         }
 426
 427         /* title position inside the selected vts */
 428         i_vts_title       = vmg.title_inf.p_attr[p_dvd->i_title-1].i_title_num;
 429         p_dvd->i_title_id =
 430             vts.title_inf.p_title_start[i_vts_title-1].i_title_id;
 431
 432         msg_Dbg( p_input, "title %d vts_title %d pgc %d",
 433                           p_dvd->i_title, i_vts_title, p_dvd->i_title_id );
 434
 435         /* title set offset XXX: convert to block values */
 436         p_dvd->i_vts_start =
 437             vts.i_pos + vts.manager_inf.i_title_vob_start_sector;
 438
 439         /* last cell */
 440         p_dvd->i_prg_cell = -1 +
 441             vts.title_unit.p_title[p_dvd->i_title_id-1].title.i_cell_nb;
 442         p_dvd->i_map_cell = 0;
 443         p_dvd->i_map_cell = CellPrg2Map( p_dvd );
 444         i_last            = CellLastSector( p_dvd );
 445
 446         /* first cell */
 447         p_dvd->i_prg_cell   = 0;
 448         p_dvd->i_map_cell   = 0;
 449         p_dvd->i_angle_cell = 0;
 450         p_dvd->i_map_cell   = CellPrg2Map    ( p_dvd );
 451         p_dvd->i_vts_lb     = CellFirstSector( p_dvd );
 452         p_dvd->i_last_lb    = CellLastSector ( p_dvd );
 453
 454         /* Force libdvdcss to check its title key.
 455          * It is only useful for title cracking method. Methods using the
 456          * decrypted disc key are fast enough to check the key at each seek */
 457         i_first = dvdcss_seek( p_dvd->dvdhandle,
 458                                p_dvd->i_vts_start + p_dvd->i_vts_lb,
 459                                DVDCSS_SEEK_KEY );
 460         if( i_first < 0 )
 461         {
 462             msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 463             return -1;
 464         }
 465
 466         /* Area definition */
 467         p_input->stream.p_selected_area->i_start = LB2OFF( i_first );
 468         p_input->stream.p_selected_area->i_size  =
 469                                         LB2OFF( i_last + 1 - p_dvd->i_vts_lb );
 470
 471         /* Destroy obsolete ES by reinitializing programs */
 472         DVDFlushStream( p_input );
 473
 474         /* Angle management: angles are handled through programs */
 475         p_dvd->i_angle_nb = DVDReadAngle( p_input );
 476         if( ( p_dvd->i_angle <= 0 ) || p_dvd->i_angle > p_dvd->i_angle_nb )
 477         {
 478             p_dvd->i_angle = 1;
 479         }
 480
 481         DVDSetProgram( p_input,
 482                        p_input->stream.pp_programs[p_dvd->i_angle-1] );
 483
 484         msg_Dbg( p_input, "title first %i, last %i, size %i",
 485                           i_first, i_last, i_last + 1 - p_dvd->i_vts_lb );
 486         IfoPrintTitle( p_dvd );
 487
 488         /* No PSM to read in DVD mode, we already have all information */
 489         p_input->stream.p_selected_program->b_is_ok = 1;
 490
 491         /* Find all ES in title with ifo data */
 492         DVDReadVideo( p_input );
 493         DVDReadAudio( p_input );
 494         DVDReadSPU  ( p_input );
 495
 496         if( p_input->p_demux )
 497         {
 498             DVDLaunchDecoders( p_input );
 499         }
 500
 501         /* Update the navigation variables without triggering a callback */
 502         val.i_int = p_area->i_id;
 503         var_Change( p_input, "title", VLC_VAR_SETVALUE, &val );
 504         var_Change( p_input, "chapter", VLC_VAR_CLEARCHOICES, NULL );
 505         for( i = 1; i <= p_area->i_part_nb; i++ )
 506         {
 507             val.i_int = i;
 508             var_Change( p_input, "chapter", VLC_VAR_ADDCHOICE, &val );
 509         }
 510
 511     } /* i_title >= 0 */
 512     else
 513     {
 514         p_area = p_input->stream.p_selected_area;
 515     }
 516
 517     /* Chapter selection */
 518     p_dvd->i_chapter = DVDSetChapter( p_dvd, p_area->i_part );
 519
 520     p_input->stream.p_selected_area->i_tell = DVDTell;
 521
 522     /* warn interface that something has changed */
 523     p_input->stream.b_seekable = 1;
 524     p_input->stream.b_changed  = 1;
 525
 526     /* Update the navigation variables without triggering a callback */
 527     val.i_int = p_area->i_part;
 528     var_Change( p_input, "chapter", VLC_VAR_SETVALUE, &val );
 529
 530     return 0;
 531 }
 532 #undef vts
 533 #undef vmg
 534
 535 #define title \
 536     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 537
 538 /*****************************************************************************
 539  * DVDRead: reads data packets.
 540  *****************************************************************************
 541  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 542  * bytes.
 543  *****************************************************************************/
 544 static ssize_t DVDRead( input_thread_t * p_input,
 545                         byte_t * p_buffer, size_t i_count )
 546 {
 547     thread_dvd_data_t *     p_dvd;
 548     int                     i_read;
 549     int                     i_blocks;
 550     int                     i_block_once = 0;
 551
 552     p_dvd = (thread_dvd_data_t *)(p_input->p_access_data);
 553
 554     i_read = 0;
 555     i_blocks = OFF2LB(i_count);
 556
 557     while( i_blocks )
 558     {
 559         i_block_once = LbMaxOnce( p_dvd );
 560         if( i_block_once > i_blocks )
 561         {
 562             i_block_once = i_blocks;
 563         }
 564         else if( i_block_once <= 0 )
 565         {
 566             /* EOT */
 567             break;
 568         }
 569
 570         if( i_block_once != dvdcss_read( p_dvd->dvdhandle, p_buffer,
 571                                          i_block_once, DVDCSS_READ_DECRYPT ) )
 572         {
 573             return -1;
 574         }
 575
 576         i_blocks -= i_block_once;
 577         i_read += i_block_once;
 578         p_buffer += LB2OFF( i_block_once );
 579
 580         /* Update global position */
 581         p_dvd->i_vts_lb += i_block_once;
 582     }
 583
 584     vlc_mutex_lock( &p_input->stream.stream_lock );
 585
 586     if( p_dvd->b_new_chapter )
 587     {
 588         p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 589         p_dvd->b_new_chapter                    = 0;
 590     }
 591
 592     if( ( p_input->stream.p_selected_area->i_tell + LB2OFF( i_read )
 593             >= p_input->stream.p_selected_area->i_size )
 594        || ( i_block_once  <= 0 ) )
 595     {
 596         if( ( p_dvd->i_title + 1 ) >= p_input->stream.i_area_nb )
 597         {
 598             /* EOF */
 599             vlc_mutex_unlock( &p_input->stream.stream_lock );
 600             return 0;
 601         }
 602
 603         /* EOT */
 604         msg_Dbg( p_input, "new title" );
 605         p_dvd->i_title++;
 606         DVDSetArea( p_input, p_input->stream.pp_areas[p_dvd->i_title] );
 607     }
 608
 609     vlc_mutex_unlock( &p_input->stream.stream_lock );
 610
 611     return LB2OFF( i_read );
 612 }
 613
 614 /*****************************************************************************
 615  * DVDSeek : Goes to a given position on the stream.
 616  *****************************************************************************
 617  * This one is used by the input and translate chronological position from
 618  * input to logical position on the device.
 619  * The lock should be taken before calling this function.
 620  *****************************************************************************/
 621 static void DVDSeek( input_thread_t * p_input, off_t i_off )
 622 {
 623     thread_dvd_data_t *     p_dvd;
 624
 625     p_dvd = ( thread_dvd_data_t * )(p_input->p_access_data);
 626
 627     vlc_mutex_lock( &p_input->stream.stream_lock );
 628     p_dvd->i_vts_lb = OFF2LB(i_off + p_input->stream.p_selected_area->i_start)
 629                        - p_dvd->i_vts_start;
 630     vlc_mutex_unlock( &p_input->stream.stream_lock );
 631
 632     p_dvd->i_prg_cell = Lb2CellPrg( p_dvd );
 633     p_dvd->i_map_cell = Lb2CellMap( p_dvd );
 634
 635     if( CellIsInterleaved( p_dvd ) )
 636     {
 637         /* if we're inside a multi-angle zone, we have to choose i_sector
 638          * in the current angle ; we can't do it all the time since cells
 639          * can be very wide out of such zones */
 640         p_dvd->i_vts_lb = CellFirstSector( p_dvd );
 641     }
 642
 643     p_dvd->i_last_lb  = CellLastSector( p_dvd );
 644     p_dvd->i_chapter  = CellPrg2Chapter( p_dvd );
 645
 646     if( dvdcss_seek( p_dvd->dvdhandle, p_dvd->i_vts_start + p_dvd->i_vts_lb,
 647                      DVDCSS_SEEK_MPEG ) < 0 )
 648     {
 649         msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 650         p_input->b_error = 1;
 651         return;
 652     }
 653
 654     vlc_mutex_lock( &p_input->stream.stream_lock );
 655     p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 656     p_input->stream.p_selected_area->i_tell = DVDTell;
 657     vlc_mutex_unlock( &p_input->stream.stream_lock );
 658
 659     msg_Dbg( p_input, "program cell: %d cell: %d chapter: %d tell "I64Fd,
 660              p_dvd->i_prg_cell, p_dvd->i_map_cell, p_dvd->i_chapter, DVDTell );
 661
 662     return;
 663 }
 664
 665 /*****************************************************************************
 666  * DVDParse: parse command line
 667  *****************************************************************************/
 668 static char * DVDParse( input_thread_t * p_input )
 669 {
 670     thread_dvd_data_t *  p_dvd;
 671     struct stat          stat_info;
 672     char *               psz_parser;
 673     char *               psz_device;
 674     char *               psz_raw;
 675     char *               psz_next;
 676     vlc_bool_t           b_options = 0;
 677     int                  i_title = 1;
 678     int                  i_chapter = 1;
 679     int                  i_angle = 1;
 680     int                  i;
 681
 682     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 683
 684 #ifdef WIN32
 685     /* On Win32 we want the DVD access plugin to be explicitly requested,
 686      * we end up with lots of problems otherwise */
 687     if( !p_input->psz_access || !*p_input->psz_access ) return NULL;
 688 #endif
 689
 690     psz_parser = psz_device = strdup( p_input->psz_name );
 691     if( !psz_parser )
 692     {
 693         return NULL;
 694     }
 695
 696     /* Parse input string :
 697      * [device][@rawdevice][@[title][,[chapter][,angle]]] */
 698     while( *psz_parser && *psz_parser != '@' )
 699     {
 700         psz_parser++;
 701     }
 702
 703     if( *psz_parser == '@' )
 704     {
 705         /* Maybe found raw device or option list */
 706         *psz_parser = '\0';
 707         psz_raw = ++psz_parser;
 708     }
 709     else
 710     {
 711         psz_raw = "";
 712     }
 713
 714     if( *psz_parser && !strtol( psz_parser, NULL, 10 ) )
 715     {
 716         /* what we've found is either a raw device or a partial option
 717          * list e.g. @,29 or both a device and a list ; search end of string */
 718         while( *psz_parser && *psz_parser != '@' )
 719         {
 720             psz_parser++;
 721         }
 722
 723         if( *psz_parser == '@' )
 724         {
 725             /* found end of raw device, and beginning of options */
 726             *psz_parser = '\0';
 727             ++psz_parser;
 728             b_options = 1;
 729         }
 730         else
 731         {
 732             psz_parser = psz_raw + 1;
 733             for( i=0 ; i<3 ; i++ )
 734             {
 735                 if( !*psz_parser )
 736                 {
 737                     /* we have only a raw device */
 738                     break;
 739                 }
 740                 if( strtol( psz_parser, NULL, 10 ) )
 741                 {
 742                     /* we have only a partial list of options, no device */
 743                     psz_parser = psz_raw;
 744                     psz_raw = "";
 745                     b_options = 1;
 746                     break;
 747                 }
 748                 psz_parser++;
 749             }
 750         }
 751     }
 752     else
 753     {
 754         /* found beginning of options ; no raw device specified */
 755         psz_raw = "";
 756         b_options = 1;
 757     }
 758
 759     if( b_options )
 760     {
 761         /* Found options */
 762         i_title = (int)strtol( psz_parser, &psz_next, 10 );
 763         if( *psz_next )
 764         {
 765             psz_parser = psz_next + 1;
 766             i_chapter = (int)strtol( psz_parser, &psz_next, 10 );
 767             if( *psz_next )
 768             {
 769                 i_angle = (int)strtol( psz_next + 1, NULL, 10 );
 770             }
 771         }
 772
 773         p_dvd->i_title = i_title ? i_title : 1;
 774         p_dvd->i_chapter = i_chapter ? i_chapter : 1;
 775         p_dvd->i_angle = i_angle ? i_angle : 1;
 776     }
 777
 778     if( *psz_raw )
 779     {
 780         if( *psz_raw )
 781         {
 782             /* check the raw device */
 783             if( stat( psz_raw, &stat_info ) == -1 )
 784             {
 785                 msg_Warn( p_input, "cannot stat() raw device `%s' (%s)",
 786                                    psz_raw, strerror(errno));
 787                 /* put back '@' */
 788                 *(psz_raw - 1) = '@';
 789                 psz_raw = "";
 790             }
 791             else
 792             {
 793                 char * psz_env;
 794
 795 #ifndef WIN32
 796                 if( !S_ISCHR(stat_info.st_mode) )
 797                 {
 798                     msg_Warn( p_input, "raw device %s is"
 799                               " not a valid char device", psz_raw );
 800                     /* put back '@' */
 801                     *(psz_raw - 1) = '@';
 802                     psz_raw = "";
 803                 }
 804                 else
 805 #endif
 806                 {
 807                     psz_env = malloc( strlen("DVDCSS_RAW_DEVICE=")
 808                                     + strlen( psz_raw ) + 1 );
 809                     sprintf( psz_env, "DVDCSS_RAW_DEVICE=%s", psz_raw );
 810                     putenv( psz_env );
 811                 }
 812             }
 813         }
 814         else
 815         {
 816             psz_raw = "";
 817         }
 818     }
 819
 820     if( !*psz_device )
 821     {
 822         free( psz_device );
 823
 824         if( !p_input->psz_access )
 825         {
 826             /* no device and no access specified: we probably don't want DVD */
 827             return NULL;
 828         }
 829         psz_device = config_GetPsz( p_input, "dvd" );
 830     }
 831
 832 #ifndef WIN32
 833     /* check block device */
 834     if( stat( psz_device, &stat_info ) == -1 )
 835     {
 836         msg_Warn( p_input, "cannot stat() device `%s' (%s)",
 837                   psz_device, strerror(errno));
 838         free( psz_device );
 839         return NULL;
 840     }
 841
 842     if( !S_ISBLK(stat_info.st_mode) && !S_ISCHR(stat_info.st_mode) )
 843     {
 844         msg_Warn( p_input,
 845                   "dvd module discarded (not a valid block device)" );
 846         free( psz_device );
 847         return NULL;
 848     }
 849 #endif
 850
 851     msg_Dbg( p_input, "dvd=%s raw=%s title=%d chapter=%d angle=%d",
 852                       psz_device, psz_raw, p_dvd->i_title,
 853                       p_dvd->i_chapter, p_dvd->i_angle );
 854
 855     return psz_device;
 856 }