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 1.3 2002/10/26 15:24:19 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, "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     p_input->psz_demux = "dvdold";
 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     IfoDestroy( p_dvd->p_ifo );
 269     dvdcss_close( p_dvd->dvdhandle );
 270     free( p_dvd );
 271 }
 272
 273 /*****************************************************************************
 274  * DVDSetProgram: used to change angle
 275  *****************************************************************************/
 276 static int DVDSetProgram( input_thread_t    * p_input,
 277                           pgrm_descriptor_t * p_program )
 278 {
 279     if( p_input->stream.p_selected_program != p_program )
 280     {
 281         thread_dvd_data_t *  p_dvd;
 282         int                  i_angle;
 283
 284         p_dvd   = (thread_dvd_data_t*)(p_input->p_access_data);
 285         i_angle = p_program->i_number;
 286
 287         /* DVD is actually mono-program: we only need the current angle
 288          * number, so copy the data between programs */
 289         memcpy( p_program,
 290                 p_input->stream.p_selected_program,
 291                 sizeof(pgrm_descriptor_t) );
 292         p_program->i_number                = i_angle;
 293         p_input->stream.p_selected_program = p_program;
 294
 295 #define title \
 296     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 297         if( title.p_cell_play[p_dvd->i_prg_cell].i_category & 0xf000 )
 298         {
 299             if( ( p_program->i_number - p_dvd->i_angle ) < 0 )
 300             {
 301                 /* we have to go backwards */
 302                 p_dvd->i_map_cell = 0;
 303             }
 304             p_dvd->i_prg_cell += ( p_program->i_number - p_dvd->i_angle );
 305             p_dvd->i_map_cell =  CellPrg2Map( p_dvd );
 306             p_dvd->i_map_cell += p_dvd->i_angle_cell;
 307             p_dvd->i_vts_lb   =  CellFirstSector( p_dvd );
 308             p_dvd->i_last_lb  =  CellLastSector( p_dvd );
 309             p_dvd->i_angle    =  p_program->i_number;
 310         }
 311         else
 312         {
 313             p_dvd->i_angle    =  p_program->i_number;
 314         }
 315 #undef title
 316         msg_Dbg( p_input, "angle %d selected", p_dvd->i_angle );
 317     }
 318
 319     return 0;
 320 }
 321
 322 /*****************************************************************************
 323  * DVDSetArea: initialize input data for title x, chapter y.
 324  * It should be called for each user navigation request.
 325  *****************************************************************************
 326  * Take care that i_title starts from 0 (vmg) and i_chapter start from 1.
 327  * Note that you have to take the lock before entering here.
 328  *****************************************************************************/
 329 #define vmg p_dvd->p_ifo->vmg
 330 #define vts p_dvd->p_ifo->vts
 331
 332 static void DVDFlushStream( input_thread_t * p_input )
 333 {
 334     if( p_input->stream.pp_programs != NULL )
 335     {
 336         /* We don't use input_EndStream here since
 337          * we keep area structures */
 338         while( p_input->stream.i_es_number )
 339         {
 340             input_DelES( p_input, p_input->stream.pp_es[0] );
 341         }
 342
 343         while( p_input->stream.i_pgrm_number )
 344         {
 345             input_DelProgram( p_input, p_input->stream.pp_programs[0] );
 346         }
 347
 348         if( p_input->stream.pp_selected_es )
 349         {
 350             free( p_input->stream.pp_selected_es );
 351             p_input->stream.pp_selected_es = NULL;
 352         }
 353         p_input->stream.i_selected_es_number = 0;
 354     }
 355
 356     return;
 357 }
 358
 359 static int DVDReadAngle( input_thread_t * p_input )
 360 {
 361     thread_dvd_data_t * p_dvd;
 362     int                 i_angle_nb;
 363     int                 i;
 364
 365     p_dvd      = (thread_dvd_data_t*)(p_input->p_access_data);
 366     i_angle_nb = vmg.title_inf.p_attr[p_dvd->i_title-1].i_angle_nb;
 367
 368     input_AddProgram( p_input, 1, sizeof( stream_ps_data_t ) );
 369     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 370
 371     for( i = 1 ; i < i_angle_nb ; i++ )
 372     {
 373         input_AddProgram( p_input, i+1, 0 );
 374     }
 375
 376     return i_angle_nb;
 377 }
 378
 379 static int DVDSetArea( input_thread_t * p_input, input_area_t * p_area )
 380 {
 381     thread_dvd_data_t *  p_dvd;
 382
 383     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 384
 385     /* we can't use the interface slider until initilization is complete */
 386     p_input->stream.b_seekable = 0;
 387
 388     if( p_area != p_input->stream.p_selected_area )
 389     {
 390         int     i_vts_title;
 391         u32     i_first;
 392         u32     i_last;
 393
 394         /* Reset the Chapter position of the old title */
 395         p_input->stream.p_selected_area->i_part = 1;
 396         p_input->stream.p_selected_area         = p_area;
 397
 398         /*
 399          *  We have to load all title information
 400          */
 401
 402         /* title number as it appears in the interface list */
 403         p_dvd->i_title      = p_area->i_id;
 404         p_dvd->i_chapter_nb = p_area->i_part_nb;
 405
 406         if( IfoTitleSet( p_dvd->p_ifo, p_dvd->i_title ) < 0 )
 407         {
 408             msg_Err( p_input, "fatal error in vts ifo" );
 409             free( p_dvd );
 410             return -1;
 411         }
 412
 413         /* title position inside the selected vts */
 414         i_vts_title       = vmg.title_inf.p_attr[p_dvd->i_title-1].i_title_num;
 415         p_dvd->i_title_id =
 416             vts.title_inf.p_title_start[i_vts_title-1].i_title_id;
 417
 418         msg_Dbg( p_input, "title %d vts_title %d pgc %d",
 419                           p_dvd->i_title, i_vts_title, p_dvd->i_title_id );
 420
 421         /* title set offset XXX: convert to block values */
 422         p_dvd->i_vts_start =
 423             vts.i_pos + vts.manager_inf.i_title_vob_start_sector;
 424
 425         /* last cell */
 426         p_dvd->i_prg_cell = -1 +
 427             vts.title_unit.p_title[p_dvd->i_title_id-1].title.i_cell_nb;
 428         p_dvd->i_map_cell = 0;
 429         p_dvd->i_map_cell = CellPrg2Map( p_dvd );
 430         i_last            = CellLastSector( p_dvd );
 431
 432         /* first cell */
 433         p_dvd->i_prg_cell   = 0;
 434         p_dvd->i_map_cell   = 0;
 435         p_dvd->i_angle_cell = 0;
 436         p_dvd->i_map_cell   = CellPrg2Map    ( p_dvd );
 437         p_dvd->i_vts_lb     = CellFirstSector( p_dvd );
 438         p_dvd->i_last_lb    = CellLastSector ( p_dvd );
 439
 440         /* Force libdvdcss to check its title key.
 441          * It is only useful for title cracking method. Methods using the
 442          * decrypted disc key are fast enough to check the key at each seek */
 443         i_first = dvdcss_seek( p_dvd->dvdhandle,
 444                                p_dvd->i_vts_start + p_dvd->i_vts_lb,
 445                                DVDCSS_SEEK_KEY );
 446         if( i_first < 0 )
 447         {
 448             msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 449             return -1;
 450         }
 451
 452         /* Area definition */
 453         p_input->stream.p_selected_area->i_start = LB2OFF( i_first );
 454         p_input->stream.p_selected_area->i_size  =
 455                                         LB2OFF( i_last + 1 - p_dvd->i_vts_lb );
 456
 457         /* Destroy obsolete ES by reinitializing programs */
 458         DVDFlushStream( p_input );
 459
 460         /* Angle management: angles are handled through programs */
 461         p_dvd->i_angle_nb = DVDReadAngle( p_input );
 462         if( ( p_dvd->i_angle <= 0 ) || p_dvd->i_angle > p_dvd->i_angle_nb )
 463         {
 464             p_dvd->i_angle = 1;
 465         }
 466
 467         DVDSetProgram( p_input,
 468                        p_input->stream.pp_programs[p_dvd->i_angle-1] );
 469
 470         msg_Dbg( p_input, "title first %i, last %i, size %i",
 471                           i_first, i_last, i_last + 1 - p_dvd->i_vts_lb );
 472         IfoPrintTitle( p_dvd );
 473
 474         /* No PSM to read in DVD mode, we already have all information */
 475         p_input->stream.p_selected_program->b_is_ok = 1;
 476
 477         /* Find all ES in title with ifo data */
 478         DVDReadVideo( p_input );
 479         DVDReadAudio( p_input );
 480         DVDReadSPU  ( p_input );
 481
 482         if( p_input->p_demux )
 483         {
 484             DVDLaunchDecoders( p_input );
 485         }
 486
 487     } /* i_title >= 0 */
 488     else
 489     {
 490         p_area = p_input->stream.p_selected_area;
 491     }
 492
 493     /* Chapter selection */
 494     p_dvd->i_chapter = DVDSetChapter( p_dvd, p_area->i_part );
 495
 496     p_input->stream.p_selected_area->i_tell = DVDTell;
 497
 498     /* warn interface that something has changed */
 499     p_input->stream.b_seekable = 1;
 500     p_input->stream.b_changed  = 1;
 501
 502     return 0;
 503 }
 504 #undef vts
 505 #undef vmg
 506
 507 #define title \
 508     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 509
 510 /*****************************************************************************
 511  * DVDRead: reads data packets.
 512  *****************************************************************************
 513  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 514  * bytes.
 515  *****************************************************************************/
 516 static ssize_t DVDRead( input_thread_t * p_input,
 517                         byte_t * p_buffer, size_t i_count )
 518 {
 519     thread_dvd_data_t *     p_dvd;
 520     int                     i_read;
 521     int                     i_blocks;
 522     int                     i_block_once = 0;
 523
 524     p_dvd = (thread_dvd_data_t *)(p_input->p_access_data);
 525
 526     i_read = 0;
 527     i_blocks = OFF2LB(i_count);
 528
 529     while( i_blocks )
 530     {
 531         i_block_once = LbMaxOnce( p_dvd );
 532         if( i_block_once > i_blocks )
 533         {
 534             i_block_once = i_blocks;
 535         }
 536         else if( i_block_once <= 0 )
 537         {
 538             /* EOT */
 539             break;
 540         }
 541
 542         if( i_block_once != dvdcss_read( p_dvd->dvdhandle, p_buffer,
 543                                          i_block_once, DVDCSS_READ_DECRYPT ) )
 544         {
 545             return -1;
 546         }
 547
 548         i_blocks -= i_block_once;
 549         i_read += i_block_once;
 550         p_buffer += LB2OFF( i_block_once );
 551
 552         /* Update global position */
 553         p_dvd->i_vts_lb += i_block_once;
 554     }
 555
 556     vlc_mutex_lock( &p_input->stream.stream_lock );
 557
 558     if( p_dvd->b_new_chapter )
 559     {
 560         p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 561         p_dvd->b_new_chapter                    = 0;
 562     }
 563
 564     if( ( p_input->stream.p_selected_area->i_tell + LB2OFF( i_read )
 565             >= p_input->stream.p_selected_area->i_size )
 566        || ( i_block_once  <= 0 ) )
 567     {
 568         if( ( p_dvd->i_title + 1 ) >= p_input->stream.i_area_nb )
 569         {
 570             /* EOF */
 571             vlc_mutex_unlock( &p_input->stream.stream_lock );
 572             return 0;
 573         }
 574
 575         /* EOT */
 576         msg_Dbg( p_input, "new title" );
 577         p_dvd->i_title++;
 578         DVDSetArea( p_input, p_input->stream.pp_areas[p_dvd->i_title] );
 579     }
 580
 581     vlc_mutex_unlock( &p_input->stream.stream_lock );
 582
 583     return LB2OFF( i_read );
 584 }
 585
 586 /*****************************************************************************
 587  * DVDSeek : Goes to a given position on the stream.
 588  *****************************************************************************
 589  * This one is used by the input and translate chronological position from
 590  * input to logical position on the device.
 591  * The lock should be taken before calling this function.
 592  *****************************************************************************/
 593 static void DVDSeek( input_thread_t * p_input, off_t i_off )
 594 {
 595     thread_dvd_data_t *     p_dvd;
 596
 597     p_dvd = ( thread_dvd_data_t * )(p_input->p_access_data);
 598
 599     vlc_mutex_lock( &p_input->stream.stream_lock );
 600     p_dvd->i_vts_lb = OFF2LB(i_off + p_input->stream.p_selected_area->i_start)
 601                        - p_dvd->i_vts_start;
 602     vlc_mutex_unlock( &p_input->stream.stream_lock );
 603
 604     p_dvd->i_prg_cell = Lb2CellPrg( p_dvd );
 605     p_dvd->i_map_cell = Lb2CellMap( p_dvd );
 606
 607     if( CellIsInterleaved( p_dvd ) )
 608     {
 609         /* if we're inside a multi-angle zone, we have to choose i_sector
 610          * in the current angle ; we can't do it all the time since cells
 611          * can be very wide out of such zones */
 612         p_dvd->i_vts_lb = CellFirstSector( p_dvd );
 613     }
 614
 615     p_dvd->i_last_lb  = CellLastSector( p_dvd );
 616     p_dvd->i_chapter  = CellPrg2Chapter( p_dvd );
 617
 618     if( dvdcss_seek( p_dvd->dvdhandle, p_dvd->i_vts_start + p_dvd->i_vts_lb,
 619                      DVDCSS_SEEK_MPEG ) < 0 )
 620     {
 621         msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 622         p_input->b_error = 1;
 623         return;
 624     }
 625
 626     vlc_mutex_lock( &p_input->stream.stream_lock );
 627     p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 628     p_input->stream.p_selected_area->i_tell = DVDTell;
 629     vlc_mutex_unlock( &p_input->stream.stream_lock );
 630
 631     msg_Dbg( p_input, "program cell: %d cell: %d chapter: %d tell %lld",
 632              p_dvd->i_prg_cell, p_dvd->i_map_cell, p_dvd->i_chapter, DVDTell );
 633
 634     return;
 635 }
 636
 637 /*****************************************************************************
 638  * DVDParse: parse command line
 639  *****************************************************************************/
 640 static char * DVDParse( input_thread_t * p_input )
 641 {
 642     thread_dvd_data_t *  p_dvd;
 643     struct stat          stat_info;
 644     char *               psz_parser;
 645     char *               psz_device;
 646     char *               psz_raw;
 647     char *               psz_next;
 648     vlc_bool_t           b_options = 0;
 649     int                  i_title = 1;
 650     int                  i_chapter = 1;
 651     int                  i_angle = 1;
 652     int                  i;
 653
 654     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 655
 656 #ifdef WIN32
 657     /* On Win32 we want the DVD access plugin to be explicitly requested,
 658      * we end up with lots of problems otherwise */
 659     if( !p_input->psz_access || !*p_input->psz_access ) return NULL;
 660 #endif
 661
 662     psz_parser = psz_device = strdup( p_input->psz_name );
 663     if( !psz_parser )
 664     {
 665         return NULL;
 666     }
 667
 668     /* Parse input string :
 669      * [device][@rawdevice][@[title][,[chapter][,angle]]] */
 670     while( *psz_parser && *psz_parser != '@' )
 671     {
 672         psz_parser++;
 673     }
 674
 675     if( *psz_parser == '@' )
 676     {
 677         /* Maybe found raw device or option list */
 678         *psz_parser = '\0';
 679         psz_raw = ++psz_parser;
 680     }
 681     else
 682     {
 683         psz_raw = "";
 684     }
 685
 686     if( *psz_parser && !strtol( psz_parser, NULL, 10 ) )
 687     {
 688         /* what we've found is either a raw device or a partial option
 689          * list e.g. @,29 or both a device and a list ; search end of string */
 690         while( *psz_parser && *psz_parser != '@' )
 691         {
 692             psz_parser++;
 693         }
 694
 695         if( *psz_parser == '@' )
 696         {
 697             /* found end of raw device, and beginning of options */
 698             *psz_parser = '\0';
 699             ++psz_parser;
 700             b_options = 1;
 701         }
 702         else
 703         {
 704             psz_parser = psz_raw + 1;
 705             for( i=0 ; i<3 ; i++ )
 706             {
 707                 if( !*psz_parser )
 708                 {
 709                     /* we have only a raw device */
 710                     break;
 711                 }
 712                 if( strtol( psz_parser, NULL, 10 ) )
 713                 {
 714                     /* we have only a partial list of options, no device */
 715                     psz_parser = psz_raw;
 716                     psz_raw = "";
 717                     b_options = 1;
 718                     break;
 719                 }
 720                 psz_parser++;
 721             }
 722         }
 723     }
 724     else
 725     {
 726         /* found beginning of options ; no raw device specified */
 727         psz_raw = "";
 728         b_options = 1;
 729     }
 730
 731     if( b_options )
 732     {
 733         /* Found options */
 734         i_title = (int)strtol( psz_parser, &psz_next, 10 );
 735         if( *psz_next )
 736         {
 737             psz_parser = psz_next + 1;
 738             i_chapter = (int)strtol( psz_parser, &psz_next, 10 );
 739             if( *psz_next )
 740             {
 741                 i_angle = (int)strtol( psz_next + 1, NULL, 10 );
 742             }
 743         }
 744
 745         p_dvd->i_title = i_title ? i_title : 1;
 746         p_dvd->i_chapter = i_chapter ? i_chapter : 1;
 747         p_dvd->i_angle = i_angle ? i_angle : 1;
 748     }
 749
 750     if( *psz_raw )
 751     {
 752         if( *psz_raw )
 753         {
 754             /* check the raw device */
 755             if( stat( psz_raw, &stat_info ) == -1 )
 756             {
 757                 msg_Warn( p_input, "cannot stat() raw device `%s' (%s)",
 758                                    psz_raw, strerror(errno));
 759                 /* put back '@' */
 760                 *(psz_raw - 1) = '@';
 761                 psz_raw = "";
 762             }
 763             else
 764             {
 765                 char * psz_env;
 766
 767 #ifndef WIN32
 768                 if( !S_ISCHR(stat_info.st_mode) )
 769                 {
 770                     msg_Warn( p_input, "raw device %s is"
 771                               " not a valid char device", psz_raw );
 772                     /* put back '@' */
 773                     *(psz_raw - 1) = '@';
 774                     psz_raw = "";
 775                 }
 776                 else
 777 #endif
 778                 {
 779                     psz_env = malloc( strlen("DVDCSS_RAW_DEVICE=")
 780                                     + strlen( psz_raw ) + 1 );
 781                     sprintf( psz_env, "DVDCSS_RAW_DEVICE=%s", psz_raw );
 782                     putenv( psz_env );
 783                 }
 784             }
 785         }
 786         else
 787         {
 788             psz_raw = "";
 789         }
 790     }
 791
 792     if( !*psz_device )
 793     {
 794         free( psz_device );
 795
 796         if( !p_input->psz_access )
 797         {
 798             /* no device and no access specified: we probably don't want DVD */
 799             return NULL;
 800         }
 801         psz_device = config_GetPsz( p_input, "dvd" );
 802     }
 803
 804 #ifndef WIN32
 805     /* check block device */
 806     if( stat( psz_device, &stat_info ) == -1 )
 807     {
 808         msg_Err( p_input, "cannot stat() device `%s' (%s)",
 809                           psz_device, strerror(errno));
 810         free( psz_device );
 811         return NULL;
 812     }
 813
 814     if( !S_ISBLK(stat_info.st_mode) && !S_ISCHR(stat_info.st_mode) )
 815     {
 816         msg_Warn( p_input,
 817                   "dvd module discarded (not a valid block device)" );
 818         free( psz_device );
 819         return NULL;
 820     }
 821 #endif
 822
 823     msg_Dbg( p_input, "dvd=%s raw=%s title=%d chapter=%d angle=%d",
 824                       psz_device, psz_raw, p_dvd->i_title,
 825                       p_dvd->i_chapter, p_dvd->i_angle );
 826
 827     return psz_device;
 828 }