git.sesse.net Git - vlc/blob - plugins/dvd/dvd_access.c

   1 /* dvd_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  *  -dvd_ifo for ifo parsing and analyse
   8  *  -dvd_udf to find files
   9  *****************************************************************************
  10  * Copyright (C) 1998-2001 VideoLAN
  11  * $Id: dvd_access.c,v 1.21 2002/07/17 21:28:19 stef 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 #ifdef HAVE_UNISTD_H
  41 #   include <unistd.h>
  42 #endif
  43
  44 #include <fcntl.h>
  45 #include <sys/types.h>
  46 #include <sys/stat.h>
  47 #include <string.h>
  48 #include <errno.h>
  49
  50 #ifdef STRNCASECMP_IN_STRINGS_H
  51 #   include <strings.h>
  52 #endif
  53
  54 #ifdef GOD_DAMN_DMCA
  55 #   include "dummy_dvdcss.h"
  56 #else
  57 #   include <dvdcss/dvdcss.h>
  58 #endif
  59
  60 #include "dvd.h"
  61 #include "dvd_es.h"
  62 #include "dvd_seek.h"
  63 #include "dvd_ifo.h"
  64 #include "dvd_summary.h"
  65 #include "iso_lang.h"
  66
  67 /*****************************************************************************
  68  * Local prototypes
  69  *****************************************************************************/
  70
  71 /* called from outside */
  72 static int  DVDOpen         ( input_thread_t * );
  73 static void DVDClose        ( input_thread_t * );
  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  * Functions exported as capabilities. They are declared as static so that
  83  * we don't pollute the namespace too much.
  84  *****************************************************************************/
  85 void _M( access_getfunctions)( function_list_t * p_function_list )
  86 {
  87 #define input p_function_list->functions.access
  88     input.pf_open             = DVDOpen;
  89     input.pf_close            = DVDClose;
  90     input.pf_read             = DVDRead;
  91     input.pf_set_area         = DVDSetArea;
  92     input.pf_set_program      = DVDSetProgram;
  93     input.pf_seek             = DVDSeek;
  94 #undef input
  95 }
  96
  97 /*
  98  * Data access functions
  99  */
 100
 101 #define DVDTell   LB2OFF( p_dvd->i_vts_start + p_dvd->i_vts_lb ) \
 102                   - p_input->stream.p_selected_area->i_start
 103
 104 /*****************************************************************************
 105  * DVDOpen: open dvd
 106  *****************************************************************************/
 107 static int DVDOpen( input_thread_t *p_input )
 108 {
 109     char *               psz_device;
 110     thread_dvd_data_t *  p_dvd;
 111     input_area_t *       p_area;
 112     int                  i;
 113
 114     p_dvd = malloc( sizeof(thread_dvd_data_t) );
 115     if( p_dvd == NULL )
 116     {
 117         msg_Err( p_input, "out of memory" );
 118         return -1;
 119     }
 120     p_input->p_access_data = (void *)p_dvd;
 121
 122     /* Parse command line */
 123     if( !( psz_device = DVDParse( p_input ) ) )
 124     {
 125         free( p_dvd );
 126         return -1;
 127     }
 128
 129     /*
 130      * set up input
 131      */
 132     p_input->i_mtu = 0;
 133
 134     /*
 135      *  get plugin ready
 136      */
 137     p_dvd->dvdhandle = dvdcss_open( psz_device );
 138
 139     /* free allocated string */
 140     free( psz_device );
 141
 142     if( p_dvd->dvdhandle == NULL )
 143     {
 144         msg_Err( p_input, "dvdcss cannot open device" );
 145         free( p_dvd );
 146         return -1;
 147     }
 148
 149     if( dvdcss_seek( p_dvd->dvdhandle, 0, DVDCSS_NOFLAGS ) < 0 )
 150     {
 151         msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 152         dvdcss_close( p_dvd->dvdhandle );
 153         free( p_dvd );
 154         return -1;
 155     }
 156
 157     /* Ifo allocation & initialisation */
 158     if( IfoCreate( p_dvd ) < 0 )
 159     {
 160         msg_Err( p_input, "allcation error in ifo" );
 161         dvdcss_close( p_dvd->dvdhandle );
 162         free( p_dvd );
 163         return -1;
 164     }
 165
 166     if( IfoInit( p_dvd->p_ifo ) < 0 )
 167     {
 168         msg_Err( p_input, "fatal failure in ifo" );
 169         IfoDestroy( p_dvd->p_ifo );
 170         dvdcss_close( p_dvd->dvdhandle );
 171         free( p_dvd );
 172         return -1;
 173     }
 174
 175     /* Set stream and area data */
 176     vlc_mutex_lock( &p_input->stream.stream_lock );
 177
 178     p_input->stream.i_method = INPUT_METHOD_DVD;
 179     p_input->stream.b_pace_control = 1;
 180     p_input->stream.b_seekable = 1;
 181     p_input->stream.p_selected_area->i_size = 0;
 182     p_input->stream.p_selected_area->i_tell = 0;
 183
 184     /* Initialize ES structures */
 185     input_InitStream( p_input, sizeof( stream_ps_data_t ) );
 186
 187 #define title_inf p_dvd->p_ifo->vmg.title_inf
 188     msg_Dbg( p_input, "number of titles: %d", title_inf.i_title_nb );
 189
 190 #define area p_input->stream.pp_areas
 191     /* We start from 1 here since the default area 0
 192      * is reserved for video_ts.vob */
 193     for( i = 1 ; i <= title_inf.i_title_nb ; i++ )
 194     {
 195         input_AddArea( p_input );
 196
 197         /* Titles are Program Chains */
 198         area[i]->i_id = i;
 199
 200         /* Absolute start offset and size
 201          * We can only set that with vts ifo, so we do it during the
 202          * first call to DVDSetArea */
 203         area[i]->i_start = 0;
 204         area[i]->i_size = 0;
 205
 206         /* Number of chapters */
 207         area[i]->i_part_nb = title_inf.p_attr[i-1].i_chapter_nb;
 208         area[i]->i_part = 1;
 209
 210         /* Offset to vts_i_0.ifo */
 211         area[i]->i_plugin_data = p_dvd->p_ifo->i_start +
 212                        title_inf.p_attr[i-1].i_start_sector;
 213     }
 214 #undef area
 215
 216     p_dvd->i_title = p_dvd->i_title <= title_inf.i_title_nb ?
 217                      p_dvd->i_title : 1;
 218 #undef title_inf
 219
 220     p_area = p_input->stream.pp_areas[p_dvd->i_title];
 221
 222     p_area->i_part = p_dvd->i_chapter <= p_area->i_part_nb ?
 223                      p_dvd->i_chapter : 1;
 224     p_dvd->i_chapter = 1;
 225
 226     p_dvd->b_new_chapter = 0;
 227     p_dvd->i_audio_nb = 0;
 228     p_dvd->i_spu_nb = 0;
 229
 230     /* set title, chapter, audio and subpic */
 231     if( DVDSetArea( p_input, p_area ) < 0 )
 232     {
 233         vlc_mutex_unlock( &p_input->stream.stream_lock );
 234         IfoDestroy( p_dvd->p_ifo );
 235         dvdcss_close( p_dvd->dvdhandle );
 236         free( p_dvd );
 237         return -1;
 238     }
 239
 240     vlc_mutex_unlock( &p_input->stream.stream_lock );
 241
 242     p_input->psz_demux = "dvdold";
 243
 244     return 0;
 245 }
 246
 247 /*****************************************************************************
 248  * DVDClose: close dvd
 249  *****************************************************************************/
 250 static void DVDClose( input_thread_t *p_input )
 251 {
 252     thread_dvd_data_t *p_dvd = (thread_dvd_data_t*)p_input->p_access_data;
 253
 254     IfoDestroy( p_dvd->p_ifo );
 255     dvdcss_close( p_dvd->dvdhandle );
 256     free( p_dvd );
 257 }
 258
 259 /*****************************************************************************
 260  * DVDSetProgram: used to change angle
 261  *****************************************************************************/
 262 static int DVDSetProgram( input_thread_t    * p_input,
 263                           pgrm_descriptor_t * p_program )
 264 {
 265     if( p_input->stream.p_selected_program != p_program )
 266     {
 267         thread_dvd_data_t *  p_dvd;
 268         int                  i_angle;
 269
 270         p_dvd   = (thread_dvd_data_t*)(p_input->p_access_data);
 271         i_angle = p_program->i_number;
 272
 273         /* DVD is actually mono-program: we only need the current angle
 274          * number, so copy the data between programs */
 275         memcpy( p_program,
 276                 p_input->stream.p_selected_program,
 277                 sizeof(pgrm_descriptor_t) );
 278         p_program->i_number                = i_angle;
 279         p_input->stream.p_selected_program = p_program;
 280
 281 #define title \
 282     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 283         if( title.p_cell_play[p_dvd->i_prg_cell].i_category & 0xf000 )
 284         {
 285             if( ( p_program->i_number - p_dvd->i_angle ) < 0 )
 286             {
 287                 /* we have to go backwards */
 288                 p_dvd->i_map_cell = 0;
 289             }
 290             p_dvd->i_prg_cell += ( p_program->i_number - p_dvd->i_angle );
 291             p_dvd->i_map_cell =  CellPrg2Map( p_dvd );
 292             p_dvd->i_map_cell += p_dvd->i_angle_cell;
 293             p_dvd->i_vts_lb   =  CellFirstSector( p_dvd );
 294             p_dvd->i_last_lb  =  CellLastSector( p_dvd );
 295             p_dvd->i_angle    =  p_program->i_number;
 296         }
 297         else
 298         {
 299             p_dvd->i_angle    =  p_program->i_number;
 300         }
 301 #undef title
 302         msg_Dbg( p_input, "angle %d selected", p_dvd->i_angle );
 303     }
 304
 305     return 0;
 306 }
 307
 308 /*****************************************************************************
 309  * DVDSetArea: initialize input data for title x, chapter y.
 310  * It should be called for each user navigation request.
 311  *****************************************************************************
 312  * Take care that i_title starts from 0 (vmg) and i_chapter start from 1.
 313  * Note that you have to take the lock before entering here.
 314  *****************************************************************************/
 315 #define vmg p_dvd->p_ifo->vmg
 316 #define vts p_dvd->p_ifo->vts
 317
 318 static void DVDFlushStream( input_thread_t * p_input )
 319 {
 320     if( p_input->stream.pp_programs != NULL )
 321     {
 322         /* We don't use input_EndStream here since
 323          * we keep area structures */
 324         while( p_input->stream.i_es_number )
 325         {
 326             input_DelES( p_input, p_input->stream.pp_es[0] );
 327         }
 328
 329         while( p_input->stream.i_pgrm_number )
 330         {
 331             input_DelProgram( p_input, p_input->stream.pp_programs[0] );
 332         }
 333
 334         if( p_input->stream.pp_selected_es )
 335         {
 336             free( p_input->stream.pp_selected_es );
 337             p_input->stream.pp_selected_es = NULL;
 338         }
 339         p_input->stream.i_selected_es_number = 0;
 340     }
 341
 342     return;
 343 }
 344
 345 static int DVDReadAngle( input_thread_t * p_input )
 346 {
 347     thread_dvd_data_t * p_dvd;
 348     int                 i_angle_nb;
 349     int                 i;
 350
 351     p_dvd      = (thread_dvd_data_t*)(p_input->p_access_data);
 352     i_angle_nb = vmg.title_inf.p_attr[p_dvd->i_title-1].i_angle_nb;
 353
 354     input_AddProgram( p_input, 1, sizeof( stream_ps_data_t ) );
 355     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 356
 357     for( i = 1 ; i < i_angle_nb ; i++ )
 358     {
 359         input_AddProgram( p_input, i+1, 0 );
 360     }
 361
 362     return i_angle_nb;
 363 }
 364
 365 static int DVDSetArea( input_thread_t * p_input, input_area_t * p_area )
 366 {
 367     thread_dvd_data_t *  p_dvd;
 368
 369     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 370
 371     /* we can't use the interface slider until initilization is complete */
 372     p_input->stream.b_seekable = 0;
 373
 374     if( p_area != p_input->stream.p_selected_area )
 375     {
 376         int     i_vts_title;
 377         u32     i_first;
 378         u32     i_last;
 379
 380         /* Reset the Chapter position of the old title */
 381         p_input->stream.p_selected_area->i_part = 1;
 382         p_input->stream.p_selected_area         = p_area;
 383
 384         /*
 385          *  We have to load all title information
 386          */
 387
 388         /* title number as it appears in the interface list */
 389         p_dvd->i_title      = p_area->i_id;
 390         p_dvd->i_chapter_nb = p_area->i_part_nb;
 391
 392         if( IfoTitleSet( p_dvd->p_ifo, p_dvd->i_title ) < 0 )
 393         {
 394             msg_Err( p_input, "fatal error in vts ifo" );
 395             free( p_dvd );
 396             return -1;
 397         }
 398
 399         /* title position inside the selected vts */
 400         i_vts_title       = vmg.title_inf.p_attr[p_dvd->i_title-1].i_title_num;
 401         p_dvd->i_title_id =
 402             vts.title_inf.p_title_start[i_vts_title-1].i_title_id;
 403
 404         msg_Dbg( p_input, "title %d vts_title %d pgc %d",
 405                           p_dvd->i_title, i_vts_title, p_dvd->i_title_id );
 406
 407         /* title set offset XXX: convert to block values */
 408         p_dvd->i_vts_start =
 409             vts.i_pos + vts.manager_inf.i_title_vob_start_sector;
 410
 411         /* last cell */
 412         p_dvd->i_prg_cell = -1 +
 413             vts.title_unit.p_title[p_dvd->i_title_id-1].title.i_cell_nb;
 414         p_dvd->i_map_cell = 0;
 415         p_dvd->i_map_cell = CellPrg2Map( p_dvd );
 416         i_last            = CellLastSector( p_dvd );
 417
 418         /* first cell */
 419         p_dvd->i_prg_cell   = 0;
 420         p_dvd->i_map_cell   = 0;
 421         p_dvd->i_angle_cell = 0;
 422         p_dvd->i_map_cell   = CellPrg2Map    ( p_dvd );
 423         p_dvd->i_vts_lb     = CellFirstSector( p_dvd );
 424         p_dvd->i_last_lb    = CellLastSector ( p_dvd );
 425
 426         /* Force libdvdcss to check its title key.
 427          * It is only useful for title cracking method. Methods using the
 428          * decrypted disc key are fast enough to check the key at each seek */
 429         i_first = dvdcss_seek( p_dvd->dvdhandle,
 430                                p_dvd->i_vts_start + p_dvd->i_vts_lb,
 431                                DVDCSS_SEEK_KEY );
 432         if( i_first < 0 )
 433         {
 434             msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 435             return -1;
 436         }
 437
 438         /* Area definition */
 439         p_input->stream.p_selected_area->i_start = LB2OFF( i_first );
 440         p_input->stream.p_selected_area->i_size  =
 441                                         LB2OFF( i_last + 1 - p_dvd->i_vts_lb );
 442
 443         /* Destroy obsolete ES by reinitializing programs */
 444         DVDFlushStream( p_input );
 445
 446         /* Angle management: angles are handled through programs */
 447         p_dvd->i_angle_nb = DVDReadAngle( p_input );
 448         if( ( p_dvd->i_angle <= 0 ) || p_dvd->i_angle > p_dvd->i_angle_nb )
 449         {
 450             p_dvd->i_angle = 1;
 451         }
 452
 453         DVDSetProgram( p_input,
 454                        p_input->stream.pp_programs[p_dvd->i_angle-1] );
 455
 456         msg_Dbg( p_input, "title first %i, last %i, size %i",
 457                           i_first, i_last, i_last + 1 - p_dvd->i_vts_lb );
 458         IfoPrintTitle( p_dvd );
 459
 460         /* No PSM to read in DVD mode, we already have all information */
 461         p_input->stream.p_selected_program->b_is_ok = 1;
 462
 463         /* Find all ES in title with ifo data */
 464         DVDReadVideo( p_input );
 465         DVDReadAudio( p_input );
 466         DVDReadSPU  ( p_input );
 467
 468         if( p_input->p_demux_module )
 469         {
 470             DVDLaunchDecoders( p_input );
 471         }
 472
 473     } /* i_title >= 0 */
 474     else
 475     {
 476         p_area = p_input->stream.p_selected_area;
 477     }
 478
 479     /* Chapter selection */
 480     p_dvd->i_chapter = DVDSetChapter( p_dvd, p_area->i_part );
 481
 482     p_input->stream.p_selected_area->i_tell = DVDTell;
 483
 484     /* warn interface that something has changed */
 485     p_input->stream.b_seekable = 1;
 486     p_input->stream.b_changed  = 1;
 487
 488     return 0;
 489 }
 490 #undef vts
 491 #undef vmg
 492
 493 #define title \
 494     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 495
 496 /*****************************************************************************
 497  * DVDRead: reads data packets.
 498  *****************************************************************************
 499  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 500  * bytes.
 501  *****************************************************************************/
 502 static ssize_t DVDRead( input_thread_t * p_input,
 503                         byte_t * p_buffer, size_t i_count )
 504 {
 505     thread_dvd_data_t *     p_dvd;
 506     int                     i_read;
 507     int                     i_blocks;
 508     int                     i_block_once = 0;
 509
 510     p_dvd = (thread_dvd_data_t *)(p_input->p_access_data);
 511
 512     i_read = 0;
 513     i_blocks = OFF2LB(i_count);
 514
 515     while( i_blocks )
 516     {
 517         i_block_once = LbMaxOnce( p_dvd );
 518         if( i_block_once > i_blocks )
 519         {
 520             i_block_once = i_blocks;
 521         }
 522         else if( i_block_once <= 0 )
 523         {
 524             /* EOT */
 525             break;
 526         }
 527
 528         if( i_block_once != dvdcss_read( p_dvd->dvdhandle, p_buffer,
 529                                          i_block_once, DVDCSS_READ_DECRYPT ) )
 530         {
 531             return -1;
 532         }
 533
 534         i_blocks -= i_block_once;
 535         i_read += i_block_once;
 536         p_buffer += LB2OFF( i_block_once );
 537
 538         /* Update global position */
 539         p_dvd->i_vts_lb += i_block_once;
 540     }
 541
 542     vlc_mutex_lock( &p_input->stream.stream_lock );
 543
 544     p_input->stream.p_selected_area->i_tell += LB2OFF( i_read );
 545     if( p_dvd->b_new_chapter )
 546     {
 547         p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 548         p_dvd->b_new_chapter                    = 0;
 549     }
 550
 551     if( ( p_input->stream.p_selected_area->i_tell
 552             >= p_input->stream.p_selected_area->i_size )
 553        || ( i_block_once  <= 0 ) )
 554     {
 555         if( ( p_dvd->i_title + 1 ) >= p_input->stream.i_area_nb )
 556         {
 557             /* EOF */
 558             vlc_mutex_unlock( &p_input->stream.stream_lock );
 559             return 0;
 560         }
 561
 562         /* EOT */
 563         msg_Dbg( p_input, "new title" );
 564         p_dvd->i_title++;
 565         DVDSetArea( p_input, p_input->stream.pp_areas[p_dvd->i_title] );
 566     }
 567
 568     vlc_mutex_unlock( &p_input->stream.stream_lock );
 569
 570     return LB2OFF( i_read );
 571 }
 572
 573 /*****************************************************************************
 574  * DVDSeek : Goes to a given position on the stream.
 575  *****************************************************************************
 576  * This one is used by the input and translate chronological position from
 577  * input to logical position on the device.
 578  * The lock should be taken before calling this function.
 579  *****************************************************************************/
 580 static void DVDSeek( input_thread_t * p_input, off_t i_off )
 581 {
 582     thread_dvd_data_t *     p_dvd;
 583
 584     p_dvd = ( thread_dvd_data_t * )(p_input->p_access_data);
 585
 586     vlc_mutex_lock( &p_input->stream.stream_lock );
 587     p_dvd->i_vts_lb = OFF2LB(i_off + p_input->stream.p_selected_area->i_start)
 588                        - p_dvd->i_vts_start;
 589     vlc_mutex_unlock( &p_input->stream.stream_lock );
 590
 591     p_dvd->i_prg_cell = Lb2CellPrg( p_dvd );
 592     p_dvd->i_map_cell = Lb2CellMap( p_dvd );
 593
 594     if( CellIsInterleaved( p_dvd ) )
 595     {
 596         /* if we're inside a multi-angle zone, we have to choose i_sector
 597          * in the current angle ; we can't do it all the time since cells
 598          * can be very wide out of such zones */
 599         p_dvd->i_vts_lb = CellFirstSector( p_dvd );
 600     }
 601
 602     p_dvd->i_last_lb  = CellLastSector( p_dvd );
 603     p_dvd->i_chapter  = CellPrg2Chapter( p_dvd );
 604
 605     if( dvdcss_seek( p_dvd->dvdhandle, p_dvd->i_vts_start + p_dvd->i_vts_lb,
 606                      DVDCSS_SEEK_MPEG ) < 0 )
 607     {
 608         msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 609         p_input->b_error = 1;
 610         return;
 611     }
 612
 613     vlc_mutex_lock( &p_input->stream.stream_lock );
 614     p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 615     p_input->stream.p_selected_area->i_tell = DVDTell;
 616     vlc_mutex_unlock( &p_input->stream.stream_lock );
 617
 618     msg_Dbg( p_input, "program cell: %d cell: %d chapter: %d tell %lld",
 619              p_dvd->i_prg_cell, p_dvd->i_map_cell, p_dvd->i_chapter, DVDTell );
 620
 621     return;
 622 }
 623
 624 /*****************************************************************************
 625  * DVDParse: parse command line
 626  *****************************************************************************/
 627 static char * DVDParse( input_thread_t * p_input )
 628 {
 629     thread_dvd_data_t *  p_dvd;
 630     struct stat          stat_info;
 631     char *               psz_parser;
 632     char *               psz_device;
 633     char *               psz_raw;
 634     char *               psz_next;
 635     vlc_bool_t           b_options = 0;
 636     int                  i_title = 1;
 637     int                  i_chapter = 1;
 638     int                  i_angle = 1;
 639     int                  i;
 640
 641     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 642
 643 #ifdef WIN32
 644     /* On Win32 we want the DVD access plugin to be explicitly requested,
 645      * we end up with lots of problems otherwise */
 646     if( !p_input->psz_access || !*p_input->psz_access ) return NULL;
 647 #endif
 648
 649     psz_parser = psz_device = strdup( p_input->psz_name );
 650     if( !psz_parser )
 651     {
 652         return NULL;
 653     }
 654
 655     /* Parse input string :
 656      * [device][@rawdevice][@[title][,[chapter][,angle]]] */
 657     while( *psz_parser && *psz_parser != '@' )
 658     {
 659         psz_parser++;
 660     }
 661
 662     if( *psz_parser == '@' )
 663     {
 664         /* Maybe found raw device or option list */
 665         *psz_parser = '\0';
 666         psz_raw = ++psz_parser;
 667     }
 668     else
 669     {
 670         psz_raw = "";
 671     }
 672
 673     if( *psz_parser && !strtol( psz_parser, NULL, 10 ) )
 674     {
 675         /* what we've found is either a raw device or a partial option
 676          * list e.g. @,29 or both a device and a list ; search end of string */
 677         while( *psz_parser && *psz_parser != '@' )
 678         {
 679             psz_parser++;
 680         }
 681
 682         if( *psz_parser == '@' )
 683         {
 684             /* found end of raw device, and beginning of options */
 685             *psz_parser = '\0';
 686             ++psz_parser;
 687             b_options = 1;
 688         }
 689         else
 690         {
 691             psz_parser = psz_raw + 1;
 692             for( i=0 ; i<3 ; i++ )
 693             {
 694                 if( !*psz_parser )
 695                 {
 696                     /* we have only a raw device */
 697                     break;
 698                 }
 699                 if( strtol( psz_parser, NULL, 10 ) )
 700                 {
 701                     /* we have only a partial list of options, no device */
 702                     psz_parser = psz_raw;
 703                     psz_raw = "";
 704                     b_options = 1;
 705                     break;
 706                 }
 707                 psz_parser++;
 708             }
 709         }
 710     }
 711     else
 712     {
 713         /* found beginning of options ; no raw device specified */
 714         psz_raw = "";
 715         b_options = 1;
 716     }
 717
 718     if( b_options )
 719     {
 720         /* Found options */
 721         i_title = (int)strtol( psz_parser, &psz_next, 10 );
 722         if( *psz_next )
 723         {
 724             psz_parser = psz_next + 1;
 725             i_chapter = (int)strtol( psz_parser, &psz_next, 10 );
 726             if( *psz_next )
 727             {
 728                 i_angle = (int)strtol( psz_next + 1, NULL, 10 );
 729             }
 730         }
 731
 732         p_dvd->i_title = i_title ? i_title : 1;
 733         p_dvd->i_chapter = i_chapter ? i_chapter : 1;
 734         p_dvd->i_angle = i_angle ? i_angle : 1;
 735     }
 736
 737     if( *psz_raw )
 738     {
 739         if( *psz_raw )
 740         {
 741             /* check the raw device */
 742             if( stat( psz_raw, &stat_info ) == -1 )
 743             {
 744                 msg_Warn( p_input, "cannot stat() raw device `%s' (%s)",
 745                                    psz_raw, strerror(errno));
 746                 /* put back '@' */
 747                 *(psz_raw - 1) = '@';
 748                 psz_raw = "";
 749             }
 750             else
 751             {
 752                 char * psz_env;
 753
 754 #ifndef WIN32
 755                 if( !S_ISCHR(stat_info.st_mode) )
 756                 {
 757                     msg_Warn( p_input, "raw device %s is"
 758                               " not a valid char device", psz_raw );
 759                     /* put back '@' */
 760                     *(psz_raw - 1) = '@';
 761                     psz_raw = "";
 762                 }
 763                 else
 764 #endif
 765                 {
 766                     psz_env = malloc( strlen("DVDCSS_RAW_DEVICE=")
 767                                     + strlen( psz_raw ) + 1 );
 768                     sprintf( psz_env, "DVDCSS_RAW_DEVICE=%s", psz_raw );
 769                     putenv( psz_env );
 770                 }
 771             }
 772         }
 773         else
 774         {
 775             psz_raw = "";
 776         }
 777     }
 778
 779     if( !*psz_device )
 780     {
 781         free( psz_device );
 782
 783         if( !p_input->psz_access )
 784         {
 785             /* no device and no access specified: we probably don't want DVD */
 786             return NULL;
 787         }
 788         psz_device = config_GetPsz( p_input, "dvd" );
 789     }
 790
 791 #ifndef WIN32
 792     /* check block device */
 793     if( stat( psz_device, &stat_info ) == -1 )
 794     {
 795         msg_Err( p_input, "cannot stat() device `%s' (%s)",
 796                           psz_device, strerror(errno));
 797         free( psz_device );
 798         return NULL;
 799     }
 800
 801     if( !S_ISBLK(stat_info.st_mode) && !S_ISCHR(stat_info.st_mode) )
 802     {
 803         msg_Warn( p_input,
 804                   "dvd module discarded (not a valid block device)" );
 805         free( psz_device );
 806         return NULL;
 807     }
 808 #endif
 809
 810     msg_Dbg( p_input, "dvd=%s raw=%s title=%d chapter=%d angle=%d",
 811                       psz_device, psz_raw, p_dvd->i_title,
 812                       p_dvd->i_chapter, p_dvd->i_angle );
 813
 814     return psz_device;
 815 }