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 1.1 2002/08/04 17:23:41 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 #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 "dvdcss.h"
  56 #else
  57 #   include <dvdcss/dvdcss.h>
  58 #endif
  59
  60 #include "dvd.h"
  61 #include "es.h"
  62 #include "seek.h"
  63 #include "ifo.h"
  64 #include "summary.h"
  65 #include "iso_lang.h"
  66
  67 /*****************************************************************************
  68  * Local prototypes
  69  *****************************************************************************/
  70
  71 /* called from outside */
  72 static int  DVDSetArea      ( input_thread_t *, input_area_t * );
  73 static int  DVDSetProgram   ( input_thread_t *, pgrm_descriptor_t * );
  74 static ssize_t DVDRead      ( input_thread_t *, byte_t *, size_t );
  75 static void DVDSeek         ( input_thread_t *, off_t );
  76
  77 static char * DVDParse( input_thread_t * );
  78
  79 /*
  80  * Data access functions
  81  */
  82
  83 #define DVDTell   LB2OFF( p_dvd->i_vts_start + p_dvd->i_vts_lb ) \
  84                   - p_input->stream.p_selected_area->i_start
  85
  86 /*****************************************************************************
  87  * DVDOpen: open dvd
  88  *****************************************************************************/
  89 int E_(DVDOpen) ( vlc_object_t *p_this )
  90 {
  91     input_thread_t *     p_input = (input_thread_t *)p_this;
  92     char *               psz_device;
  93     thread_dvd_data_t *  p_dvd;
  94     input_area_t *       p_area;
  95     int                  i;
  96     char *               psz_dvdcss_env;
  97
  98     p_dvd = malloc( sizeof(thread_dvd_data_t) );
  99     if( p_dvd == NULL )
 100     {
 101         msg_Err( p_input, "out of memory" );
 102         return -1;
 103     }
 104     p_input->p_access_data = (void *)p_dvd;
 105
 106     p_input->pf_read = DVDRead;
 107     p_input->pf_seek = DVDSeek;
 108     p_input->pf_set_area = DVDSetArea;
 109     p_input->pf_set_program = DVDSetProgram;
 110
 111     /* Parse command line */
 112     if( !( psz_device = DVDParse( p_input ) ) )
 113     {
 114         free( p_dvd );
 115         return -1;
 116     }
 117
 118     /*
 119      * set up input
 120      */
 121     p_input->i_mtu = 0;
 122
 123     /* override environment variable DVDCSS_METHOD with config option
 124      * (FIXME: this creates a small memory leak) */
 125     psz_dvdcss_env = config_GetPsz( p_input, "dvd-css-method" );
 126     if( psz_dvdcss_env && *psz_dvdcss_env )
 127     {
 128         char *psz_env;
 129
 130         psz_env = malloc( strlen("DVDCSS_METHOD=") +
 131                           strlen( psz_dvdcss_env ) + 1 );
 132
 133         if( !psz_env )
 134         {
 135             free( p_dvd );
 136             return -1;
 137         }
 138
 139         sprintf( psz_env, "%s%s", "DVDCSS_METHOD=", psz_dvdcss_env );
 140
 141         putenv( psz_env );
 142     }
 143     if( psz_dvdcss_env ) free( psz_dvdcss_env );
 144
 145     /*
 146      *  get plugin ready
 147      */
 148     p_dvd->dvdhandle = dvdcss_open( psz_device );
 149
 150     /* free allocated string */
 151     free( psz_device );
 152
 153     if( p_dvd->dvdhandle == NULL )
 154     {
 155         msg_Err( p_input, "dvdcss cannot open device" );
 156         free( p_dvd );
 157         return -1;
 158     }
 159
 160     if( dvdcss_seek( p_dvd->dvdhandle, 0, DVDCSS_NOFLAGS ) < 0 )
 161     {
 162         msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 163         dvdcss_close( p_dvd->dvdhandle );
 164         free( p_dvd );
 165         return -1;
 166     }
 167
 168     /* Ifo allocation & initialisation */
 169     if( IfoCreate( p_dvd ) < 0 )
 170     {
 171         msg_Err( p_input, "allcation error in ifo" );
 172         dvdcss_close( p_dvd->dvdhandle );
 173         free( p_dvd );
 174         return -1;
 175     }
 176
 177     if( IfoInit( p_dvd->p_ifo ) < 0 )
 178     {
 179         msg_Err( p_input, "fatal failure in ifo" );
 180         IfoDestroy( p_dvd->p_ifo );
 181         dvdcss_close( p_dvd->dvdhandle );
 182         free( p_dvd );
 183         return -1;
 184     }
 185
 186     /* Set stream and area data */
 187     vlc_mutex_lock( &p_input->stream.stream_lock );
 188
 189     p_input->stream.i_method = INPUT_METHOD_DVD;
 190     p_input->stream.b_pace_control = 1;
 191     p_input->stream.b_seekable = 1;
 192     p_input->stream.p_selected_area->i_size = 0;
 193     p_input->stream.p_selected_area->i_tell = 0;
 194
 195     /* Initialize ES structures */
 196     input_InitStream( p_input, sizeof( stream_ps_data_t ) );
 197
 198 #define title_inf p_dvd->p_ifo->vmg.title_inf
 199     msg_Dbg( p_input, "number of titles: %d", title_inf.i_title_nb );
 200
 201 #define area p_input->stream.pp_areas
 202     /* We start from 1 here since the default area 0
 203      * is reserved for video_ts.vob */
 204     for( i = 1 ; i <= title_inf.i_title_nb ; i++ )
 205     {
 206         input_AddArea( p_input );
 207
 208         /* Titles are Program Chains */
 209         area[i]->i_id = i;
 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         /* Number of chapters */
 218         area[i]->i_part_nb = title_inf.p_attr[i-1].i_chapter_nb;
 219         area[i]->i_part = 1;
 220
 221         /* Offset to vts_i_0.ifo */
 222         area[i]->i_plugin_data = p_dvd->p_ifo->i_start +
 223                        title_inf.p_attr[i-1].i_start_sector;
 224     }
 225 #undef area
 226
 227     p_dvd->i_title = p_dvd->i_title <= title_inf.i_title_nb ?
 228                      p_dvd->i_title : 1;
 229 #undef title_inf
 230
 231     p_area = p_input->stream.pp_areas[p_dvd->i_title];
 232
 233     p_area->i_part = p_dvd->i_chapter <= p_area->i_part_nb ?
 234                      p_dvd->i_chapter : 1;
 235     p_dvd->i_chapter = 1;
 236
 237     p_dvd->b_new_chapter = 0;
 238     p_dvd->i_audio_nb = 0;
 239     p_dvd->i_spu_nb = 0;
 240
 241     /* set title, chapter, audio and subpic */
 242     if( DVDSetArea( p_input, p_area ) < 0 )
 243     {
 244         vlc_mutex_unlock( &p_input->stream.stream_lock );
 245         IfoDestroy( p_dvd->p_ifo );
 246         dvdcss_close( p_dvd->dvdhandle );
 247         free( p_dvd );
 248         return -1;
 249     }
 250
 251     vlc_mutex_unlock( &p_input->stream.stream_lock );
 252
 253     p_input->psz_demux = "dvdold";
 254
 255     return 0;
 256 }
 257
 258 /*****************************************************************************
 259  * DVDClose: close dvd
 260  *****************************************************************************/
 261 void E_(DVDClose) ( vlc_object_t *p_this )
 262 {
 263     input_thread_t * p_input = (input_thread_t *)p_this;
 264     thread_dvd_data_t *p_dvd = (thread_dvd_data_t*)p_input->p_access_data;
 265
 266     IfoDestroy( p_dvd->p_ifo );
 267     dvdcss_close( p_dvd->dvdhandle );
 268     free( p_dvd );
 269 }
 270
 271 /*****************************************************************************
 272  * DVDSetProgram: used to change angle
 273  *****************************************************************************/
 274 static int DVDSetProgram( input_thread_t    * p_input,
 275                           pgrm_descriptor_t * p_program )
 276 {
 277     if( p_input->stream.p_selected_program != p_program )
 278     {
 279         thread_dvd_data_t *  p_dvd;
 280         int                  i_angle;
 281
 282         p_dvd   = (thread_dvd_data_t*)(p_input->p_access_data);
 283         i_angle = p_program->i_number;
 284
 285         /* DVD is actually mono-program: we only need the current angle
 286          * number, so copy the data between programs */
 287         memcpy( p_program,
 288                 p_input->stream.p_selected_program,
 289                 sizeof(pgrm_descriptor_t) );
 290         p_program->i_number                = i_angle;
 291         p_input->stream.p_selected_program = p_program;
 292
 293 #define title \
 294     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 295         if( title.p_cell_play[p_dvd->i_prg_cell].i_category & 0xf000 )
 296         {
 297             if( ( p_program->i_number - p_dvd->i_angle ) < 0 )
 298             {
 299                 /* we have to go backwards */
 300                 p_dvd->i_map_cell = 0;
 301             }
 302             p_dvd->i_prg_cell += ( p_program->i_number - p_dvd->i_angle );
 303             p_dvd->i_map_cell =  CellPrg2Map( p_dvd );
 304             p_dvd->i_map_cell += p_dvd->i_angle_cell;
 305             p_dvd->i_vts_lb   =  CellFirstSector( p_dvd );
 306             p_dvd->i_last_lb  =  CellLastSector( p_dvd );
 307             p_dvd->i_angle    =  p_program->i_number;
 308         }
 309         else
 310         {
 311             p_dvd->i_angle    =  p_program->i_number;
 312         }
 313 #undef title
 314         msg_Dbg( p_input, "angle %d selected", p_dvd->i_angle );
 315     }
 316
 317     return 0;
 318 }
 319
 320 /*****************************************************************************
 321  * DVDSetArea: initialize input data for title x, chapter y.
 322  * It should be called for each user navigation request.
 323  *****************************************************************************
 324  * Take care that i_title starts from 0 (vmg) and i_chapter start from 1.
 325  * Note that you have to take the lock before entering here.
 326  *****************************************************************************/
 327 #define vmg p_dvd->p_ifo->vmg
 328 #define vts p_dvd->p_ifo->vts
 329
 330 static void DVDFlushStream( input_thread_t * p_input )
 331 {
 332     if( p_input->stream.pp_programs != NULL )
 333     {
 334         /* We don't use input_EndStream here since
 335          * we keep area structures */
 336         while( p_input->stream.i_es_number )
 337         {
 338             input_DelES( p_input, p_input->stream.pp_es[0] );
 339         }
 340
 341         while( p_input->stream.i_pgrm_number )
 342         {
 343             input_DelProgram( p_input, p_input->stream.pp_programs[0] );
 344         }
 345
 346         if( p_input->stream.pp_selected_es )
 347         {
 348             free( p_input->stream.pp_selected_es );
 349             p_input->stream.pp_selected_es = NULL;
 350         }
 351         p_input->stream.i_selected_es_number = 0;
 352     }
 353
 354     return;
 355 }
 356
 357 static int DVDReadAngle( input_thread_t * p_input )
 358 {
 359     thread_dvd_data_t * p_dvd;
 360     int                 i_angle_nb;
 361     int                 i;
 362
 363     p_dvd      = (thread_dvd_data_t*)(p_input->p_access_data);
 364     i_angle_nb = vmg.title_inf.p_attr[p_dvd->i_title-1].i_angle_nb;
 365
 366     input_AddProgram( p_input, 1, sizeof( stream_ps_data_t ) );
 367     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 368
 369     for( i = 1 ; i < i_angle_nb ; i++ )
 370     {
 371         input_AddProgram( p_input, i+1, 0 );
 372     }
 373
 374     return i_angle_nb;
 375 }
 376
 377 static int DVDSetArea( input_thread_t * p_input, input_area_t * p_area )
 378 {
 379     thread_dvd_data_t *  p_dvd;
 380
 381     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 382
 383     /* we can't use the interface slider until initilization is complete */
 384     p_input->stream.b_seekable = 0;
 385
 386     if( p_area != p_input->stream.p_selected_area )
 387     {
 388         int     i_vts_title;
 389         u32     i_first;
 390         u32     i_last;
 391
 392         /* Reset the Chapter position of the old title */
 393         p_input->stream.p_selected_area->i_part = 1;
 394         p_input->stream.p_selected_area         = p_area;
 395
 396         /*
 397          *  We have to load all title information
 398          */
 399
 400         /* title number as it appears in the interface list */
 401         p_dvd->i_title      = p_area->i_id;
 402         p_dvd->i_chapter_nb = p_area->i_part_nb;
 403
 404         if( IfoTitleSet( p_dvd->p_ifo, p_dvd->i_title ) < 0 )
 405         {
 406             msg_Err( p_input, "fatal error in vts ifo" );
 407             free( p_dvd );
 408             return -1;
 409         }
 410
 411         /* title position inside the selected vts */
 412         i_vts_title       = vmg.title_inf.p_attr[p_dvd->i_title-1].i_title_num;
 413         p_dvd->i_title_id =
 414             vts.title_inf.p_title_start[i_vts_title-1].i_title_id;
 415
 416         msg_Dbg( p_input, "title %d vts_title %d pgc %d",
 417                           p_dvd->i_title, i_vts_title, p_dvd->i_title_id );
 418
 419         /* title set offset XXX: convert to block values */
 420         p_dvd->i_vts_start =
 421             vts.i_pos + vts.manager_inf.i_title_vob_start_sector;
 422
 423         /* last cell */
 424         p_dvd->i_prg_cell = -1 +
 425             vts.title_unit.p_title[p_dvd->i_title_id-1].title.i_cell_nb;
 426         p_dvd->i_map_cell = 0;
 427         p_dvd->i_map_cell = CellPrg2Map( p_dvd );
 428         i_last            = CellLastSector( p_dvd );
 429
 430         /* first cell */
 431         p_dvd->i_prg_cell   = 0;
 432         p_dvd->i_map_cell   = 0;
 433         p_dvd->i_angle_cell = 0;
 434         p_dvd->i_map_cell   = CellPrg2Map    ( p_dvd );
 435         p_dvd->i_vts_lb     = CellFirstSector( p_dvd );
 436         p_dvd->i_last_lb    = CellLastSector ( p_dvd );
 437
 438         /* Force libdvdcss to check its title key.
 439          * It is only useful for title cracking method. Methods using the
 440          * decrypted disc key are fast enough to check the key at each seek */
 441         i_first = dvdcss_seek( p_dvd->dvdhandle,
 442                                p_dvd->i_vts_start + p_dvd->i_vts_lb,
 443                                DVDCSS_SEEK_KEY );
 444         if( i_first < 0 )
 445         {
 446             msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 447             return -1;
 448         }
 449
 450         /* Area definition */
 451         p_input->stream.p_selected_area->i_start = LB2OFF( i_first );
 452         p_input->stream.p_selected_area->i_size  =
 453                                         LB2OFF( i_last + 1 - p_dvd->i_vts_lb );
 454
 455         /* Destroy obsolete ES by reinitializing programs */
 456         DVDFlushStream( p_input );
 457
 458         /* Angle management: angles are handled through programs */
 459         p_dvd->i_angle_nb = DVDReadAngle( p_input );
 460         if( ( p_dvd->i_angle <= 0 ) || p_dvd->i_angle > p_dvd->i_angle_nb )
 461         {
 462             p_dvd->i_angle = 1;
 463         }
 464
 465         DVDSetProgram( p_input,
 466                        p_input->stream.pp_programs[p_dvd->i_angle-1] );
 467
 468         msg_Dbg( p_input, "title first %i, last %i, size %i",
 469                           i_first, i_last, i_last + 1 - p_dvd->i_vts_lb );
 470         IfoPrintTitle( p_dvd );
 471
 472         /* No PSM to read in DVD mode, we already have all information */
 473         p_input->stream.p_selected_program->b_is_ok = 1;
 474
 475         /* Find all ES in title with ifo data */
 476         DVDReadVideo( p_input );
 477         DVDReadAudio( p_input );
 478         DVDReadSPU  ( p_input );
 479
 480         if( p_input->p_demux )
 481         {
 482             DVDLaunchDecoders( p_input );
 483         }
 484
 485     } /* i_title >= 0 */
 486     else
 487     {
 488         p_area = p_input->stream.p_selected_area;
 489     }
 490
 491     /* Chapter selection */
 492     p_dvd->i_chapter = DVDSetChapter( p_dvd, p_area->i_part );
 493
 494     p_input->stream.p_selected_area->i_tell = DVDTell;
 495
 496     /* warn interface that something has changed */
 497     p_input->stream.b_seekable = 1;
 498     p_input->stream.b_changed  = 1;
 499
 500     return 0;
 501 }
 502 #undef vts
 503 #undef vmg
 504
 505 #define title \
 506     p_dvd->p_ifo->vts.title_unit.p_title[p_dvd->i_title_id-1].title
 507
 508 /*****************************************************************************
 509  * DVDRead: reads data packets.
 510  *****************************************************************************
 511  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 512  * bytes.
 513  *****************************************************************************/
 514 static ssize_t DVDRead( input_thread_t * p_input,
 515                         byte_t * p_buffer, size_t i_count )
 516 {
 517     thread_dvd_data_t *     p_dvd;
 518     int                     i_read;
 519     int                     i_blocks;
 520     int                     i_block_once = 0;
 521
 522     p_dvd = (thread_dvd_data_t *)(p_input->p_access_data);
 523
 524     i_read = 0;
 525     i_blocks = OFF2LB(i_count);
 526
 527     while( i_blocks )
 528     {
 529         i_block_once = LbMaxOnce( p_dvd );
 530         if( i_block_once > i_blocks )
 531         {
 532             i_block_once = i_blocks;
 533         }
 534         else if( i_block_once <= 0 )
 535         {
 536             /* EOT */
 537             break;
 538         }
 539
 540         if( i_block_once != dvdcss_read( p_dvd->dvdhandle, p_buffer,
 541                                          i_block_once, DVDCSS_READ_DECRYPT ) )
 542         {
 543             return -1;
 544         }
 545
 546         i_blocks -= i_block_once;
 547         i_read += i_block_once;
 548         p_buffer += LB2OFF( i_block_once );
 549
 550         /* Update global position */
 551         p_dvd->i_vts_lb += i_block_once;
 552     }
 553
 554     vlc_mutex_lock( &p_input->stream.stream_lock );
 555
 556     p_input->stream.p_selected_area->i_tell += LB2OFF( i_read );
 557     if( p_dvd->b_new_chapter )
 558     {
 559         p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 560         p_dvd->b_new_chapter                    = 0;
 561     }
 562
 563     if( ( p_input->stream.p_selected_area->i_tell
 564             >= p_input->stream.p_selected_area->i_size )
 565        || ( i_block_once  <= 0 ) )
 566     {
 567         if( ( p_dvd->i_title + 1 ) >= p_input->stream.i_area_nb )
 568         {
 569             /* EOF */
 570             vlc_mutex_unlock( &p_input->stream.stream_lock );
 571             return 0;
 572         }
 573
 574         /* EOT */
 575         msg_Dbg( p_input, "new title" );
 576         p_dvd->i_title++;
 577         DVDSetArea( p_input, p_input->stream.pp_areas[p_dvd->i_title] );
 578     }
 579
 580     vlc_mutex_unlock( &p_input->stream.stream_lock );
 581
 582     return LB2OFF( i_read );
 583 }
 584
 585 /*****************************************************************************
 586  * DVDSeek : Goes to a given position on the stream.
 587  *****************************************************************************
 588  * This one is used by the input and translate chronological position from
 589  * input to logical position on the device.
 590  * The lock should be taken before calling this function.
 591  *****************************************************************************/
 592 static void DVDSeek( input_thread_t * p_input, off_t i_off )
 593 {
 594     thread_dvd_data_t *     p_dvd;
 595
 596     p_dvd = ( thread_dvd_data_t * )(p_input->p_access_data);
 597
 598     vlc_mutex_lock( &p_input->stream.stream_lock );
 599     p_dvd->i_vts_lb = OFF2LB(i_off + p_input->stream.p_selected_area->i_start)
 600                        - p_dvd->i_vts_start;
 601     vlc_mutex_unlock( &p_input->stream.stream_lock );
 602
 603     p_dvd->i_prg_cell = Lb2CellPrg( p_dvd );
 604     p_dvd->i_map_cell = Lb2CellMap( p_dvd );
 605
 606     if( CellIsInterleaved( p_dvd ) )
 607     {
 608         /* if we're inside a multi-angle zone, we have to choose i_sector
 609          * in the current angle ; we can't do it all the time since cells
 610          * can be very wide out of such zones */
 611         p_dvd->i_vts_lb = CellFirstSector( p_dvd );
 612     }
 613
 614     p_dvd->i_last_lb  = CellLastSector( p_dvd );
 615     p_dvd->i_chapter  = CellPrg2Chapter( p_dvd );
 616
 617     if( dvdcss_seek( p_dvd->dvdhandle, p_dvd->i_vts_start + p_dvd->i_vts_lb,
 618                      DVDCSS_SEEK_MPEG ) < 0 )
 619     {
 620         msg_Err( p_input, "%s", dvdcss_error( p_dvd->dvdhandle ) );
 621         p_input->b_error = 1;
 622         return;
 623     }
 624
 625     vlc_mutex_lock( &p_input->stream.stream_lock );
 626     p_input->stream.p_selected_area->i_part = p_dvd->i_chapter;
 627     p_input->stream.p_selected_area->i_tell = DVDTell;
 628     vlc_mutex_unlock( &p_input->stream.stream_lock );
 629
 630     msg_Dbg( p_input, "program cell: %d cell: %d chapter: %d tell %lld",
 631              p_dvd->i_prg_cell, p_dvd->i_map_cell, p_dvd->i_chapter, DVDTell );
 632
 633     return;
 634 }
 635
 636 /*****************************************************************************
 637  * DVDParse: parse command line
 638  *****************************************************************************/
 639 static char * DVDParse( input_thread_t * p_input )
 640 {
 641     thread_dvd_data_t *  p_dvd;
 642     struct stat          stat_info;
 643     char *               psz_parser;
 644     char *               psz_device;
 645     char *               psz_raw;
 646     char *               psz_next;
 647     vlc_bool_t           b_options = 0;
 648     int                  i_title = 1;
 649     int                  i_chapter = 1;
 650     int                  i_angle = 1;
 651     int                  i;
 652
 653     p_dvd = (thread_dvd_data_t*)(p_input->p_access_data);
 654
 655 #ifdef WIN32
 656     /* On Win32 we want the DVD access plugin to be explicitly requested,
 657      * we end up with lots of problems otherwise */
 658     if( !p_input->psz_access || !*p_input->psz_access ) return NULL;
 659 #endif
 660
 661     psz_parser = psz_device = strdup( p_input->psz_name );
 662     if( !psz_parser )
 663     {
 664         return NULL;
 665     }
 666
 667     /* Parse input string :
 668      * [device][@rawdevice][@[title][,[chapter][,angle]]] */
 669     while( *psz_parser && *psz_parser != '@' )
 670     {
 671         psz_parser++;
 672     }
 673
 674     if( *psz_parser == '@' )
 675     {
 676         /* Maybe found raw device or option list */
 677         *psz_parser = '\0';
 678         psz_raw = ++psz_parser;
 679     }
 680     else
 681     {
 682         psz_raw = "";
 683     }
 684
 685     if( *psz_parser && !strtol( psz_parser, NULL, 10 ) )
 686     {
 687         /* what we've found is either a raw device or a partial option
 688          * list e.g. @,29 or both a device and a list ; search end of string */
 689         while( *psz_parser && *psz_parser != '@' )
 690         {
 691             psz_parser++;
 692         }
 693
 694         if( *psz_parser == '@' )
 695         {
 696             /* found end of raw device, and beginning of options */
 697             *psz_parser = '\0';
 698             ++psz_parser;
 699             b_options = 1;
 700         }
 701         else
 702         {
 703             psz_parser = psz_raw + 1;
 704             for( i=0 ; i<3 ; i++ )
 705             {
 706                 if( !*psz_parser )
 707                 {
 708                     /* we have only a raw device */
 709                     break;
 710                 }
 711                 if( strtol( psz_parser, NULL, 10 ) )
 712                 {
 713                     /* we have only a partial list of options, no device */
 714                     psz_parser = psz_raw;
 715                     psz_raw = "";
 716                     b_options = 1;
 717                     break;
 718                 }
 719                 psz_parser++;
 720             }
 721         }
 722     }
 723     else
 724     {
 725         /* found beginning of options ; no raw device specified */
 726         psz_raw = "";
 727         b_options = 1;
 728     }
 729
 730     if( b_options )
 731     {
 732         /* Found options */
 733         i_title = (int)strtol( psz_parser, &psz_next, 10 );
 734         if( *psz_next )
 735         {
 736             psz_parser = psz_next + 1;
 737             i_chapter = (int)strtol( psz_parser, &psz_next, 10 );
 738             if( *psz_next )
 739             {
 740                 i_angle = (int)strtol( psz_next + 1, NULL, 10 );
 741             }
 742         }
 743
 744         p_dvd->i_title = i_title ? i_title : 1;
 745         p_dvd->i_chapter = i_chapter ? i_chapter : 1;
 746         p_dvd->i_angle = i_angle ? i_angle : 1;
 747     }
 748
 749     if( *psz_raw )
 750     {
 751         if( *psz_raw )
 752         {
 753             /* check the raw device */
 754             if( stat( psz_raw, &stat_info ) == -1 )
 755             {
 756                 msg_Warn( p_input, "cannot stat() raw device `%s' (%s)",
 757                                    psz_raw, strerror(errno));
 758                 /* put back '@' */
 759                 *(psz_raw - 1) = '@';
 760                 psz_raw = "";
 761             }
 762             else
 763             {
 764                 char * psz_env;
 765
 766 #ifndef WIN32
 767                 if( !S_ISCHR(stat_info.st_mode) )
 768                 {
 769                     msg_Warn( p_input, "raw device %s is"
 770                               " not a valid char device", psz_raw );
 771                     /* put back '@' */
 772                     *(psz_raw - 1) = '@';
 773                     psz_raw = "";
 774                 }
 775                 else
 776 #endif
 777                 {
 778                     psz_env = malloc( strlen("DVDCSS_RAW_DEVICE=")
 779                                     + strlen( psz_raw ) + 1 );
 780                     sprintf( psz_env, "DVDCSS_RAW_DEVICE=%s", psz_raw );
 781                     putenv( psz_env );
 782                 }
 783             }
 784         }
 785         else
 786         {
 787             psz_raw = "";
 788         }
 789     }
 790
 791     if( !*psz_device )
 792     {
 793         free( psz_device );
 794
 795         if( !p_input->psz_access )
 796         {
 797             /* no device and no access specified: we probably don't want DVD */
 798             return NULL;
 799         }
 800         psz_device = config_GetPsz( p_input, "dvd" );
 801     }
 802
 803 #ifndef WIN32
 804     /* check block device */
 805     if( stat( psz_device, &stat_info ) == -1 )
 806     {
 807         msg_Err( p_input, "cannot stat() device `%s' (%s)",
 808                           psz_device, strerror(errno));
 809         free( psz_device );
 810         return NULL;
 811     }
 812
 813     if( !S_ISBLK(stat_info.st_mode) && !S_ISCHR(stat_info.st_mode) )
 814     {
 815         msg_Warn( p_input,
 816                   "dvd module discarded (not a valid block device)" );
 817         free( psz_device );
 818         return NULL;
 819     }
 820 #endif
 821
 822     msg_Dbg( p_input, "dvd=%s raw=%s title=%d chapter=%d angle=%d",
 823                       psz_device, psz_raw, p_dvd->i_title,
 824                       p_dvd->i_chapter, p_dvd->i_angle );
 825
 826     return psz_device;
 827 }