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 1.6 2002/12/06 16:34:04 sam 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, "dvd-css-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         input_AddArea( p_input );
 209
 210         /* Titles are Program Chains */
 211         area[i]->i_id = i;
 212
 213         /* Absolute start offset and size
 214          * We can only set that with vts ifo, so we do it during the
 215          * first call to DVDSetArea */
 216         area[i]->i_start = 0;
 217         area[i]->i_size = 0;
 218
 219         /* Number of chapters */
 220         area[i]->i_part_nb = title_inf.p_attr[i-1].i_chapter_nb;
 221         area[i]->i_part = 1;
 222
 223         /* Offset to vts_i_0.ifo */
 224         area[i]->i_plugin_data = p_dvd->p_ifo->i_start +
 225                        title_inf.p_attr[i-1].i_start_sector;
 226     }
 227 #undef area
 228
 229     p_dvd->i_title = p_dvd->i_title <= title_inf.i_title_nb ?
 230                      p_dvd->i_title : 1;
 231 #undef title_inf
 232
 233     p_area = p_input->stream.pp_areas[p_dvd->i_title];
 234
 235     p_area->i_part = p_dvd->i_chapter <= p_area->i_part_nb ?
 236                      p_dvd->i_chapter : 1;
 237     p_dvd->i_chapter = 1;
 238
 239     p_dvd->b_new_chapter = 0;
 240     p_dvd->i_audio_nb = 0;
 241     p_dvd->i_spu_nb = 0;
 242
 243     /* set title, chapter, audio and subpic */
 244     if( DVDSetArea( p_input, p_area ) < 0 )
 245     {
 246         vlc_mutex_unlock( &p_input->stream.stream_lock );
 247         IfoDestroy( p_dvd->p_ifo );
 248         dvdcss_close( p_dvd->dvdhandle );
 249         free( p_dvd );
 250         return -1;
 251     }
 252
 253     vlc_mutex_unlock( &p_input->stream.stream_lock );
 254
 255     if( !p_input->psz_demux || !*p_input->psz_demux )
 256     {
 257         p_input->psz_demux = "dvdold";
 258     }
 259
 260     return 0;
 261 }
 262
 263 /*****************************************************************************
 264  * DVDClose: close dvd
 265  *****************************************************************************/
 266 void E_(DVDClose) ( vlc_object_t *p_this )
 267 {
 268     input_thread_t * p_input = (input_thread_t *)p_this;
 269     thread_dvd_data_t *p_dvd = (thread_dvd_data_t*)p_input->p_access_data;
 270
 271     IfoDestroy( p_dvd->p_ifo );
 272     dvdcss_close( p_dvd->dvdhandle );
 273     free( p_dvd );
 274 }
 275
 276 /*****************************************************************************
 277  * DVDSetProgram: used to change angle
 278  *****************************************************************************/
 279 static int DVDSetProgram( input_thread_t    * p_input,
 280                           pgrm_descriptor_t * p_program )
 281 {
 282     if( p_input->stream.p_selected_program != p_program )
 283     {
 284         thread_dvd_data_t *  p_dvd;
 285         int                  i_angle;
 286
 287         p_dvd   = (thread_dvd_data_t*)(p_input->p_access_data);
 288         i_angle = p_program->i_number;
 289
 290         /* DVD is actually mono-program: we only need the current angle
 291          * number, so copy the data between programs */
 292         memcpy( p_program,
 293                 p_input->stream.p_selected_program,
 294                 sizeof(pgrm_descriptor_t) );
 295         p_program->i_number                = i_angle;
 296         p_input->stream.p_selected_program = p_program;
 297
 298 #define title \
 299     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 300         if( title.p_cell_play[p_dvd->i_prg_cell].i_category & 0xf000 )
 301         {
 302             if( ( p_program->i_number - p_dvd->i_angle ) < 0 )
 303             {
 304                 /* we have to go backwards */
 305                 p_dvd->i_map_cell = 0;
 306             }
 307             p_dvd->i_prg_cell += ( p_program->i_number - p_dvd->i_angle );
 308             p_dvd->i_map_cell =  CellPrg2Map( p_dvd );
 309             p_dvd->i_map_cell += p_dvd->i_angle_cell;
 310             p_dvd->i_vts_lb   =  CellFirstSector( p_dvd );
 311             p_dvd->i_last_lb  =  CellLastSector( p_dvd );
 312             p_dvd->i_angle    =  p_program->i_number;
 313         }
 314         else
 315         {
 316             p_dvd->i_angle    =  p_program->i_number;
 317         }
 318 #undef title
 319         msg_Dbg( p_input, "angle %d selected", p_dvd->i_angle );
 320     }
 321
 322     return 0;
 323 }
 324
 325 /*****************************************************************************
 326  * DVDSetArea: initialize input data for title x, chapter y.
 327  * It should be called for each user navigation request.
 328  *****************************************************************************
 329  * Take care that i_title starts from 0 (vmg) and i_chapter start from 1.
 330  * Note that you have to take the lock before entering here.
 331  *****************************************************************************/
 332 #define vmg p_dvd->p_ifo->vmg
 333 #define vts p_dvd->p_ifo->vts
 334
 335 static void DVDFlushStream( input_thread_t * p_input )
 336 {
 337     if( p_input->stream.pp_programs != NULL )
 338     {
 339         /* We don't use input_EndStream here since
 340          * we keep area structures */
 341         while( p_input->stream.i_es_number )
 342         {
 343             input_DelES( p_input, p_input->stream.pp_es[0] );
 344         }
 345
 346         while( p_input->stream.i_pgrm_number )
 347         {
 348             input_DelProgram( p_input, p_input->stream.pp_programs[0] );
 349         }
 350
 351         if( p_input->stream.pp_selected_es )
 352         {
 353             free( p_input->stream.pp_selected_es );
 354             p_input->stream.pp_selected_es = NULL;
 355         }
 356         p_input->stream.i_selected_es_number = 0;
 357     }
 358
 359     return;
 360 }
 361
 362 static int DVDReadAngle( input_thread_t * p_input )
 363 {
 364     thread_dvd_data_t * p_dvd;
 365     int                 i_angle_nb;
 366     int                 i;
 367
 368     p_dvd      = (thread_dvd_data_t*)(p_input->p_access_data);
 369     i_angle_nb = vmg.title_inf.p_attr[p_dvd->i_title-1].i_angle_nb;
 370
 371     input_AddProgram( p_input, 1, sizeof( stream_ps_data_t ) );
 372     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 373
 374     for( i = 1 ; i < i_angle_nb ; i++ )
 375     {
 376         input_AddProgram( p_input, i+1, 0 );
 377     }
 378
 379     return i_angle_nb;
 380 }
 381
 382 static int DVDSetArea( input_thread_t * p_input, input_area_t * p_area )
 383 {
 384     thread_dvd_data_t *  p_dvd;
 385
 386     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 387
 388     /* we can't use the interface slider until initilization is complete */
 389     p_input->stream.b_seekable = 0;
 390
 391     if( p_area != p_input->stream.p_selected_area )
 392     {
 393         int     i_vts_title;
 394         u32     i_first;
 395         u32     i_last;
 396
 397         /* Reset the Chapter position of the old title */
 398         p_input->stream.p_selected_area->i_part = 1;
 399         p_input->stream.p_selected_area         = p_area;
 400
 401         /*
 402          *  We have to load all title information
 403          */
 404
 405         /* title number as it appears in the interface list */
 406         p_dvd->i_title      = p_area->i_id;
 407         p_dvd->i_chapter_nb = p_area->i_part_nb;
 408
 409         if( IfoTitleSet( p_dvd->p_ifo, p_dvd->i_title ) < 0 )
 410         {
 411             msg_Err( p_input, "fatal error in vts ifo" );
 412             free( p_dvd );
 413             return -1;
 414         }
 415
 416         /* title position inside the selected vts */
 417         i_vts_title       = vmg.title_inf.p_attr[p_dvd->i_title-1].i_title_num;
 418         p_dvd->i_title_id =
 419             vts.title_inf.p_title_start[i_vts_title-1].i_title_id;
 420
 421         msg_Dbg( p_input, "title %d vts_title %d pgc %d",
 422                           p_dvd->i_title, i_vts_title, p_dvd->i_title_id );
 423
 424         /* title set offset XXX: convert to block values */
 425         p_dvd->i_vts_start =
 426             vts.i_pos + vts.manager_inf.i_title_vob_start_sector;
 427
 428         /* last cell */
 429         p_dvd->i_prg_cell = -1 +
 430             vts.title_unit.p_title[p_dvd->i_title_id-1].title.i_cell_nb;
 431         p_dvd->i_map_cell = 0;
 432         p_dvd->i_map_cell = CellPrg2Map( p_dvd );
 433         i_last            = CellLastSector( p_dvd );
 434
 435         /* first cell */
 436         p_dvd->i_prg_cell   = 0;
 437         p_dvd->i_map_cell   = 0;
 438         p_dvd->i_angle_cell = 0;
 439         p_dvd->i_map_cell   = CellPrg2Map    ( p_dvd );
 440         p_dvd->i_vts_lb     = CellFirstSector( p_dvd );
 441         p_dvd->i_last_lb    = CellLastSector ( p_dvd );
 442
 443         /* Force libdvdcss to check its title key.
 444          * It is only useful for title cracking method. Methods using the
 445          * decrypted disc key are fast enough to check the key at each seek */
 446         i_first = dvdcss_seek( p_dvd->dvdhandle,
 447                                p_dvd->i_vts_start + p_dvd->i_vts_lb,
 448                                DVDCSS_SEEK_KEY );
 449         if( i_first < 0 )
 450         {
 451             msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 452             return -1;
 453         }
 454
 455         /* Area definition */
 456         p_input->stream.p_selected_area->i_start = LB2OFF( i_first );
 457         p_input->stream.p_selected_area->i_size  =
 458                                         LB2OFF( i_last + 1 - p_dvd->i_vts_lb );
 459
 460         /* Destroy obsolete ES by reinitializing programs */
 461         DVDFlushStream( p_input );
 462
 463         /* Angle management: angles are handled through programs */
 464         p_dvd->i_angle_nb = DVDReadAngle( p_input );
 465         if( ( p_dvd->i_angle <= 0 ) || p_dvd->i_angle > p_dvd->i_angle_nb )
 466         {
 467             p_dvd->i_angle = 1;
 468         }
 469
 470         DVDSetProgram( p_input,
 471                        p_input->stream.pp_programs[p_dvd->i_angle-1] );
 472
 473         msg_Dbg( p_input, "title first %i, last %i, size %i",
 474                           i_first, i_last, i_last + 1 - p_dvd->i_vts_lb );
 475         IfoPrintTitle( p_dvd );
 476
 477         /* No PSM to read in DVD mode, we already have all information */
 478         p_input->stream.p_selected_program->b_is_ok = 1;
 479
 480         /* Find all ES in title with ifo data */
 481         DVDReadVideo( p_input );
 482         DVDReadAudio( p_input );
 483         DVDReadSPU  ( p_input );
 484
 485         if( p_input->p_demux )
 486         {
 487             DVDLaunchDecoders( p_input );
 488         }
 489
 490     } /* i_title >= 0 */
 491     else
 492     {
 493         p_area = p_input->stream.p_selected_area;
 494     }
 495
 496     /* Chapter selection */
 497     p_dvd->i_chapter = DVDSetChapter( p_dvd, p_area->i_part );
 498
 499     p_input->stream.p_selected_area->i_tell = DVDTell;
 500
 501     /* warn interface that something has changed */
 502     p_input->stream.b_seekable = 1;
 503     p_input->stream.b_changed  = 1;
 504
 505     return 0;
 506 }
 507 #undef vts
 508 #undef vmg
 509
 510 #define title \
 511     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 512
 513 /*****************************************************************************
 514  * DVDRead: reads data packets.
 515  *****************************************************************************
 516  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 517  * bytes.
 518  *****************************************************************************/
 519 static ssize_t DVDRead( input_thread_t * p_input,
 520                         byte_t * p_buffer, size_t i_count )
 521 {
 522     thread_dvd_data_t *     p_dvd;
 523     int                     i_read;
 524     int                     i_blocks;
 525     int                     i_block_once = 0;
 526
 527     p_dvd = (thread_dvd_data_t *)(p_input->p_access_data);
 528
 529     i_read = 0;
 530     i_blocks = OFF2LB(i_count);
 531
 532     while( i_blocks )
 533     {
 534         i_block_once = LbMaxOnce( p_dvd );
 535         if( i_block_once > i_blocks )
 536         {
 537             i_block_once = i_blocks;
 538         }
 539         else if( i_block_once <= 0 )
 540         {
 541             /* EOT */
 542             break;
 543         }
 544
 545         if( i_block_once != dvdcss_read( p_dvd->dvdhandle, p_buffer,
 546                                          i_block_once, DVDCSS_READ_DECRYPT ) )
 547         {
 548             return -1;
 549         }
 550
 551         i_blocks -= i_block_once;
 552         i_read += i_block_once;
 553         p_buffer += LB2OFF( i_block_once );
 554
 555         /* Update global position */
 556         p_dvd->i_vts_lb += i_block_once;
 557     }
 558
 559     vlc_mutex_lock( &p_input->stream.stream_lock );
 560
 561     if( p_dvd->b_new_chapter )
 562     {
 563         p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 564         p_dvd->b_new_chapter                    = 0;
 565     }
 566
 567     if( ( p_input->stream.p_selected_area->i_tell + LB2OFF( i_read )
 568             >= p_input->stream.p_selected_area->i_size )
 569        || ( i_block_once  <= 0 ) )
 570     {
 571         if( ( p_dvd->i_title + 1 ) >= p_input->stream.i_area_nb )
 572         {
 573             /* EOF */
 574             vlc_mutex_unlock( &p_input->stream.stream_lock );
 575             return 0;
 576         }
 577
 578         /* EOT */
 579         msg_Dbg( p_input, "new title" );
 580         p_dvd->i_title++;
 581         DVDSetArea( p_input, p_input->stream.pp_areas[p_dvd->i_title] );
 582     }
 583
 584     vlc_mutex_unlock( &p_input->stream.stream_lock );
 585
 586     return LB2OFF( i_read );
 587 }
 588
 589 /*****************************************************************************
 590  * DVDSeek : Goes to a given position on the stream.
 591  *****************************************************************************
 592  * This one is used by the input and translate chronological position from
 593  * input to logical position on the device.
 594  * The lock should be taken before calling this function.
 595  *****************************************************************************/
 596 static void DVDSeek( input_thread_t * p_input, off_t i_off )
 597 {
 598     thread_dvd_data_t *     p_dvd;
 599
 600     p_dvd = ( thread_dvd_data_t * )(p_input->p_access_data);
 601
 602     vlc_mutex_lock( &p_input->stream.stream_lock );
 603     p_dvd->i_vts_lb = OFF2LB(i_off + p_input->stream.p_selected_area->i_start)
 604                        - p_dvd->i_vts_start;
 605     vlc_mutex_unlock( &p_input->stream.stream_lock );
 606
 607     p_dvd->i_prg_cell = Lb2CellPrg( p_dvd );
 608     p_dvd->i_map_cell = Lb2CellMap( p_dvd );
 609
 610     if( CellIsInterleaved( p_dvd ) )
 611     {
 612         /* if we're inside a multi-angle zone, we have to choose i_sector
 613          * in the current angle ; we can't do it all the time since cells
 614          * can be very wide out of such zones */
 615         p_dvd->i_vts_lb = CellFirstSector( p_dvd );
 616     }
 617
 618     p_dvd->i_last_lb  = CellLastSector( p_dvd );
 619     p_dvd->i_chapter  = CellPrg2Chapter( p_dvd );
 620
 621     if( dvdcss_seek( p_dvd->dvdhandle, p_dvd->i_vts_start + p_dvd->i_vts_lb,
 622                      DVDCSS_SEEK_MPEG ) < 0 )
 623     {
 624         msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 625         p_input->b_error = 1;
 626         return;
 627     }
 628
 629     vlc_mutex_lock( &p_input->stream.stream_lock );
 630     p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 631     p_input->stream.p_selected_area->i_tell = DVDTell;
 632     vlc_mutex_unlock( &p_input->stream.stream_lock );
 633
 634     msg_Dbg( p_input, "program cell: %d cell: %d chapter: %d tell "I64Fd,
 635              p_dvd->i_prg_cell, p_dvd->i_map_cell, p_dvd->i_chapter, DVDTell );
 636
 637     return;
 638 }
 639
 640 /*****************************************************************************
 641  * DVDParse: parse command line
 642  *****************************************************************************/
 643 static char * DVDParse( input_thread_t * p_input )
 644 {
 645     thread_dvd_data_t *  p_dvd;
 646     struct stat          stat_info;
 647     char *               psz_parser;
 648     char *               psz_device;
 649     char *               psz_raw;
 650     char *               psz_next;
 651     vlc_bool_t           b_options = 0;
 652     int                  i_title = 1;
 653     int                  i_chapter = 1;
 654     int                  i_angle = 1;
 655     int                  i;
 656
 657     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 658
 659 #ifdef WIN32
 660     /* On Win32 we want the DVD access plugin to be explicitly requested,
 661      * we end up with lots of problems otherwise */
 662     if( !p_input->psz_access || !*p_input->psz_access ) return NULL;
 663 #endif
 664
 665     psz_parser = psz_device = strdup( p_input->psz_name );
 666     if( !psz_parser )
 667     {
 668         return NULL;
 669     }
 670
 671     /* Parse input string :
 672      * [device][@rawdevice][@[title][,[chapter][,angle]]] */
 673     while( *psz_parser && *psz_parser != '@' )
 674     {
 675         psz_parser++;
 676     }
 677
 678     if( *psz_parser == '@' )
 679     {
 680         /* Maybe found raw device or option list */
 681         *psz_parser = '\0';
 682         psz_raw = ++psz_parser;
 683     }
 684     else
 685     {
 686         psz_raw = "";
 687     }
 688
 689     if( *psz_parser && !strtol( psz_parser, NULL, 10 ) )
 690     {
 691         /* what we've found is either a raw device or a partial option
 692          * list e.g. @,29 or both a device and a list ; search end of string */
 693         while( *psz_parser && *psz_parser != '@' )
 694         {
 695             psz_parser++;
 696         }
 697
 698         if( *psz_parser == '@' )
 699         {
 700             /* found end of raw device, and beginning of options */
 701             *psz_parser = '\0';
 702             ++psz_parser;
 703             b_options = 1;
 704         }
 705         else
 706         {
 707             psz_parser = psz_raw + 1;
 708             for( i=0 ; i<3 ; i++ )
 709             {
 710                 if( !*psz_parser )
 711                 {
 712                     /* we have only a raw device */
 713                     break;
 714                 }
 715                 if( strtol( psz_parser, NULL, 10 ) )
 716                 {
 717                     /* we have only a partial list of options, no device */
 718                     psz_parser = psz_raw;
 719                     psz_raw = "";
 720                     b_options = 1;
 721                     break;
 722                 }
 723                 psz_parser++;
 724             }
 725         }
 726     }
 727     else
 728     {
 729         /* found beginning of options ; no raw device specified */
 730         psz_raw = "";
 731         b_options = 1;
 732     }
 733
 734     if( b_options )
 735     {
 736         /* Found options */
 737         i_title = (int)strtol( psz_parser, &psz_next, 10 );
 738         if( *psz_next )
 739         {
 740             psz_parser = psz_next + 1;
 741             i_chapter = (int)strtol( psz_parser, &psz_next, 10 );
 742             if( *psz_next )
 743             {
 744                 i_angle = (int)strtol( psz_next + 1, NULL, 10 );
 745             }
 746         }
 747
 748         p_dvd->i_title = i_title ? i_title : 1;
 749         p_dvd->i_chapter = i_chapter ? i_chapter : 1;
 750         p_dvd->i_angle = i_angle ? i_angle : 1;
 751     }
 752
 753     if( *psz_raw )
 754     {
 755         if( *psz_raw )
 756         {
 757             /* check the raw device */
 758             if( stat( psz_raw, &stat_info ) == -1 )
 759             {
 760                 msg_Warn( p_input, "cannot stat() raw device `%s' (%s)",
 761                                    psz_raw, strerror(errno));
 762                 /* put back '@' */
 763                 *(psz_raw - 1) = '@';
 764                 psz_raw = "";
 765             }
 766             else
 767             {
 768                 char * psz_env;
 769
 770 #ifndef WIN32
 771                 if( !S_ISCHR(stat_info.st_mode) )
 772                 {
 773                     msg_Warn( p_input, "raw device %s is"
 774                               " not a valid char device", psz_raw );
 775                     /* put back '@' */
 776                     *(psz_raw - 1) = '@';
 777                     psz_raw = "";
 778                 }
 779                 else
 780 #endif
 781                 {
 782                     psz_env = malloc( strlen("DVDCSS_RAW_DEVICE=")
 783                                     + strlen( psz_raw ) + 1 );
 784                     sprintf( psz_env, "DVDCSS_RAW_DEVICE=%s", psz_raw );
 785                     putenv( psz_env );
 786                 }
 787             }
 788         }
 789         else
 790         {
 791             psz_raw = "";
 792         }
 793     }
 794
 795     if( !*psz_device )
 796     {
 797         free( psz_device );
 798
 799         if( !p_input->psz_access )
 800         {
 801             /* no device and no access specified: we probably don't want DVD */
 802             return NULL;
 803         }
 804         psz_device = config_GetPsz( p_input, "dvd" );
 805     }
 806
 807 #ifndef WIN32
 808     /* check block device */
 809     if( stat( psz_device, &stat_info ) == -1 )
 810     {
 811         msg_Err( p_input, "cannot stat() device `%s' (%s)",
 812                           psz_device, strerror(errno));
 813         free( psz_device );
 814         return NULL;
 815     }
 816
 817     if( !S_ISBLK(stat_info.st_mode) && !S_ISCHR(stat_info.st_mode) )
 818     {
 819         msg_Warn( p_input,
 820                   "dvd module discarded (not a valid block device)" );
 821         free( psz_device );
 822         return NULL;
 823     }
 824 #endif
 825
 826     msg_Dbg( p_input, "dvd=%s raw=%s title=%d chapter=%d angle=%d",
 827                       psz_device, psz_raw, p_dvd->i_title,
 828                       p_dvd->i_chapter, p_dvd->i_angle );
 829
 830     return psz_device;
 831 }