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

   1 /*****************************************************************************
   2  * vcd.c : VCD input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2004 VideoLAN
   5  * $Id$
   6  *
   7  * Author: Johan Bilien <jobi@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc/input.h>
  31
  32 #include "cdrom.h"
  33
  34 /*****************************************************************************
  35  * Module descriptior
  36  *****************************************************************************/
  37 static int  Open ( vlc_object_t * );
  38 static void Close( vlc_object_t * );
  39
  40 #define CACHING_TEXT N_("Caching value in ms")
  41 #define CACHING_LONGTEXT N_( \
  42     "Allows you to modify the default caching value for cdda streams. This " \
  43     "value should be set in milliseconds units." )
  44
  45 vlc_module_begin();
  46     set_description( _("VCD input") );
  47     set_capability( "access2", 10 );
  48     set_callbacks( Open, Close );
  49
  50     add_usage_hint( N_("[vcd:][device][@[title][,[chapter]]]") );
  51     add_integer( "vcd-caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT,
  52                  CACHING_LONGTEXT, VLC_TRUE );
  53     add_shortcut( "vcd" );
  54     add_shortcut( "svcd" );
  55 vlc_module_end();
  56
  57 /*****************************************************************************
  58  * Local prototypes
  59  *****************************************************************************/
  60
  61 /* how many blocks VCDRead will read in each loop */
  62 #define VCD_BLOCKS_ONCE 20
  63 #define VCD_DATA_ONCE   (VCD_BLOCKS_ONCE * VCD_DATA_SIZE)
  64
  65 struct access_sys_t
  66 {
  67     vcddev_t    *vcddev;                            /* vcd device descriptor */
  68
  69     /* Title infos */
  70     int           i_titles;
  71     input_title_t *title[99];            /* No more that 99 track in a vcd ? */
  72
  73
  74     int         i_sector;                                  /* Current Sector */
  75     int         *p_sectors;                                 /* Track sectors */
  76 };
  77
  78 static block_t *Block( access_t * );
  79 static int      Seek( access_t *, int64_t );
  80 static int      Control( access_t *, int, va_list );
  81
  82 static int      EntryPoints( access_t * );
  83
  84 /*****************************************************************************
  85  * VCDOpen: open vcd
  86  *****************************************************************************/
  87 static int Open( vlc_object_t *p_this )
  88 {
  89     access_t     *p_access = (access_t *)p_this;
  90     access_sys_t *p_sys;
  91     char *psz_dup = strdup( p_access->psz_path );
  92     char *psz;
  93     int i_title = 0;
  94     int i_chapter = 0;
  95     int i;
  96     vcddev_t *vcddev;
  97
  98     /* Command line: vcd://[dev_path][@title[,chapter]] */
  99     if( ( psz = strchr( psz_dup, '@' ) ) )
 100     {
 101         *psz++ = '\0';
 102
 103         i_title = strtol( psz, &psz, 0 );
 104         if( *psz )
 105             i_chapter = strtol( psz+1, &psz, 0 );
 106     }
 107
 108     if( *psz_dup == '\0' )
 109     {
 110         free( psz_dup );
 111
 112         /* Only when selected */
 113         if( *p_access->psz_access == '\0' )
 114             return VLC_EGENERIC;
 115
 116         psz_dup = var_CreateGetString( p_access, "vcd" );
 117         if( *psz_dup == '\0' )
 118         {
 119             free( psz_dup );
 120             return VLC_EGENERIC;
 121         }
 122     }
 123
 124     /* Open VCD */
 125     if( !(vcddev = ioctl_Open( p_this, psz_dup )) )
 126     {
 127         msg_Warn( p_access, "could not open %s", psz_dup );
 128         free( psz_dup );
 129         return VLC_EGENERIC;
 130     }
 131     free( psz_dup );
 132
 133     /* Set up p_access */
 134     p_access->pf_read = NULL;
 135     p_access->pf_block = Block;
 136     p_access->pf_control = Control;
 137     p_access->pf_seek = Seek;
 138     p_access->info.i_update = 0;
 139     p_access->info.i_size = 0;
 140     p_access->info.i_pos = 0;
 141     p_access->info.b_eof = VLC_FALSE;
 142     p_access->info.i_title = 0;
 143     p_access->info.i_seekpoint = 0;
 144     p_access->p_sys = p_sys = malloc( sizeof( access_sys_t ) );
 145     memset( p_sys, 0, sizeof( access_sys_t ) );
 146     p_sys->vcddev = vcddev;
 147
 148     /* We read the Table Of Content information */
 149     p_sys->i_titles = ioctl_GetTracksMap( VLC_OBJECT(p_access),
 150                                           p_sys->vcddev, &p_sys->p_sectors );
 151     if( p_sys->i_titles < 0 )
 152     {
 153         msg_Err( p_access, "unable to count tracks" );
 154         goto error;
 155     }
 156     else if( p_sys->i_titles <= 1 )
 157     {
 158         msg_Err( p_access, "no movie tracks found" );
 159         goto error;
 160     }
 161     /* The first title isn't usable */
 162     p_sys->i_titles--;
 163
 164     /* Build title table */
 165     for( i = 0; i < p_sys->i_titles; i++ )
 166     {
 167         input_title_t *t = p_sys->title[i] = vlc_input_title_New();
 168
 169         fprintf( stderr, "title[%d] start=%d\n", i, p_sys->p_sectors[1+i] );
 170         fprintf( stderr, "title[%d] end=%d\n", i, p_sys->p_sectors[i+2] );
 171
 172         t->i_size = ( p_sys->p_sectors[i+2] - p_sys->p_sectors[i+1] ) *
 173                     (int64_t)VCD_DATA_SIZE;
 174     }
 175
 176     /* Map entry points into chapters */
 177     if( EntryPoints( p_access ) )
 178     {
 179         msg_Warn( p_access, "could not read entry points, will not use them" );
 180     }
 181
 182     /* Starting title/chapter and sector */
 183     if( i_title >= p_sys->i_titles )
 184         i_title = 0;
 185     if( i_chapter >= p_sys->title[i_title]->i_seekpoint )
 186         i_chapter = 0;
 187
 188     p_sys->i_sector = p_sys->p_sectors[1+i_title];
 189     if( i_chapter > 0 )
 190     {
 191         int64_t i_off = p_sys->title[i_title]->seekpoint[i_chapter]->i_byte_offset;
 192         p_sys->i_sector += i_off / VCD_DATA_SIZE;
 193     }
 194     p_access->info.i_title = i_title;
 195     p_access->info.i_seekpoint = i_chapter;
 196     p_access->info.i_size = p_sys->title[i_title]->i_size;
 197     p_access->info.i_pos = ( p_sys->i_sector - p_sys->p_sectors[1+i_title] ) * VCD_DATA_SIZE;
 198
 199     p_access->psz_demux = strdup( "ps2" );
 200
 201     return VLC_SUCCESS;
 202
 203 error:
 204     ioctl_Close( VLC_OBJECT(p_access), p_sys->vcddev );
 205     free( p_sys );
 206     return VLC_EGENERIC;
 207 }
 208
 209 /*****************************************************************************
 210  * Close: closes vcd
 211  *****************************************************************************/
 212 static void Close( vlc_object_t *p_this )
 213 {
 214     access_t     *p_access = (access_t *)p_this;
 215     access_sys_t *p_sys = p_access->p_sys;
 216
 217     ioctl_Close( p_this, p_sys->vcddev );
 218     free( p_sys );
 219 }
 220
 221 /*****************************************************************************
 222  * Control:
 223  *****************************************************************************/
 224 static int Control( access_t *p_access, int i_query, va_list args )
 225 {
 226     access_sys_t *p_sys = p_access->p_sys;
 227     vlc_bool_t   *pb_bool;
 228     int          *pi_int;
 229     int64_t      *pi_64;
 230     input_title_t ***ppp_title;
 231     int i;
 232
 233     switch( i_query )
 234     {
 235         /* */
 236         case ACCESS_CAN_SEEK:
 237         case ACCESS_CAN_FASTSEEK:
 238         case ACCESS_CAN_PAUSE:
 239         case ACCESS_CAN_CONTROL_PACE:
 240             pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
 241             *pb_bool = VLC_TRUE;
 242             break;
 243
 244         /* */
 245         case ACCESS_GET_MTU:
 246             pi_int = (int*)va_arg( args, int * );
 247             *pi_int = VCD_DATA_ONCE;
 248             break;
 249
 250         case ACCESS_GET_PTS_DELAY:
 251             pi_64 = (int64_t*)va_arg( args, int64_t * );
 252             *pi_64 = (int64_t)var_GetInteger( p_access, "vcd-caching" ) * I64C(1000);
 253             break;
 254
 255         /* */
 256         case ACCESS_SET_PAUSE_STATE:
 257             break;
 258
 259         case ACCESS_GET_TITLE_INFO:
 260             ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
 261             pi_int    = (int*)va_arg( args, int* );
 262
 263             /* Duplicate title infos */
 264             *pi_int = p_sys->i_titles;
 265             *ppp_title = malloc( sizeof( input_title_t ** ) * p_sys->i_titles );
 266             for( i = 0; i < p_sys->i_titles; i++ )
 267             {
 268                 (*ppp_title)[i] = vlc_input_title_Duplicate( p_sys->title[i] );
 269             }
 270             break;
 271
 272         case ACCESS_SET_TITLE:
 273             i = (int)va_arg( args, int );
 274             if( i != p_access->info.i_title )
 275             {
 276                 /* Update info */
 277                 p_access->info.i_update |= INPUT_UPDATE_TITLE|INPUT_UPDATE_SEEKPOINT|INPUT_UPDATE_SIZE;
 278                 p_access->info.i_title = i;
 279                 p_access->info.i_seekpoint = 0;
 280                 p_access->info.i_size = p_sys->title[i]->i_size;
 281                 p_access->info.i_pos  = 0;
 282
 283                 /* Next sector to read */
 284                 p_sys->i_sector = p_sys->p_sectors[1+i];
 285             }
 286             break;
 287
 288         case ACCESS_SET_SEEKPOINT:
 289         {
 290             input_title_t *t = p_sys->title[p_access->info.i_title];
 291             i = (int)va_arg( args, int );
 292             if( t->i_seekpoint > 0 )
 293             {
 294                 p_access->info.i_update |= INPUT_UPDATE_SEEKPOINT;
 295                 p_access->info.i_seekpoint = i;
 296
 297                 p_sys->i_sector = p_sys->p_sectors[1+p_access->info.i_title] +
 298                                   t->seekpoint[i]->i_byte_offset / VCD_DATA_SIZE;
 299
 300                 p_access->info.i_pos = (int64_t)(p_sys->i_sector - p_sys->p_sectors[1+p_access->info.i_title] ) *
 301                                        (int64_t)VCD_DATA_SIZE;
 302             }
 303             return VLC_SUCCESS;
 304         }
 305
 306         default:
 307             msg_Err( p_access, "unimplemented query in control" );
 308             return VLC_EGENERIC;
 309
 310     }
 311     return VLC_SUCCESS;
 312 }
 313
 314 /*****************************************************************************
 315  * Block:
 316  *****************************************************************************/
 317 static block_t *Block( access_t *p_access )
 318 {
 319     access_sys_t *p_sys = p_access->p_sys;
 320     int i_skip = p_access->info.i_pos % VCD_DATA_SIZE;
 321     block_t      *p_block;
 322     int          i_blocks;
 323     int          i_read;
 324     int          i;
 325
 326     if( p_access->info.b_eof )
 327         return NULL;
 328
 329     /* Read raw data */
 330     i_blocks = VCD_BLOCKS_ONCE;
 331
 332     /* Don't read after a title */
 333     if( p_sys->i_sector + i_blocks >= p_sys->p_sectors[p_access->info.i_title + 2] )
 334     {
 335         i_blocks = p_sys->p_sectors[p_access->info.i_title + 2 ] - p_sys->i_sector;
 336         if( i_blocks <= 0 ) i_blocks = 1;   /* Should never occur */
 337     }
 338
 339     p_block = block_New( p_access, i_blocks * VCD_DATA_SIZE );
 340
 341     if( ioctl_ReadSectors( VLC_OBJECT(p_access), p_sys->vcddev, p_sys->i_sector,
 342                            p_block->p_buffer, i_blocks, VCD_TYPE ) < 0 )
 343     {
 344         msg_Err( p_access, "cannot read a sector" );
 345         block_Release( p_block );
 346
 347         p_block = NULL;
 348         i_blocks = 1;   /* Next sector */
 349     }
 350
 351
 352     i_read = 0;
 353     for( i = 0; i < i_blocks; i++ )
 354     {
 355         input_title_t *t = p_sys->title[p_access->info.i_title];
 356
 357         /* A good sector read */
 358         i_read++;
 359         p_sys->i_sector++;
 360
 361         /* Check end of title */
 362         if( p_sys->i_sector >= p_sys->p_sectors[p_access->info.i_title + 2] )
 363         {
 364             if( p_access->info.i_title + 2 >= p_sys->i_titles )
 365             {
 366                 p_access->info.b_eof = VLC_TRUE;
 367                 break;
 368             }
 369             p_access->info.i_update |= INPUT_UPDATE_TITLE|INPUT_UPDATE_SEEKPOINT|INPUT_UPDATE_SIZE;
 370             p_access->info.i_title++;
 371             p_access->info.i_seekpoint = 0;
 372             p_access->info.i_size = p_sys->title[p_access->info.i_title]->i_size;
 373             p_access->info.i_pos = 0;
 374         }
 375         else if( t->i_seekpoint > 0 &&
 376                  p_access->info.i_seekpoint + 1 < t->i_seekpoint &&
 377                  p_access->info.i_pos - i_skip + i_read * VCD_DATA_SIZE >= t->seekpoint[p_access->info.i_seekpoint+1]->i_byte_offset )
 378         {
 379             fprintf( stderr, "seekpoint change\n" );
 380             p_access->info.i_update |= INPUT_UPDATE_SEEKPOINT;
 381             p_access->info.i_seekpoint++;
 382         }
 383         /* TODO */
 384     }
 385
 386     if( i_read <= 0 )
 387     {
 388         block_Release( p_block );
 389         return NULL;
 390     }
 391
 392     if( p_block )
 393     {
 394
 395         /* Really read data */
 396         p_block->i_buffer = i_read * VCD_DATA_SIZE;
 397         /* */
 398         p_block->i_buffer -= i_skip;
 399         p_block->p_buffer += i_skip;
 400
 401         p_access->info.i_pos += p_block->i_buffer;
 402     }
 403
 404     return p_block;
 405 }
 406
 407 /*****************************************************************************
 408  * Seek:
 409  *****************************************************************************/
 410 static int Seek( access_t *p_access, int64_t i_pos )
 411 {
 412     return VLC_EGENERIC;
 413 }
 414
 415 /*****************************************************************************
 416  * EntryPoints:
 417  *****************************************************************************/
 418 static int EntryPoints( access_t *p_access )
 419 {
 420     access_sys_t *p_sys = p_access->p_sys;
 421     uint8_t      sector[VCD_DATA_SIZE];
 422
 423     entries_sect_t entries;
 424     int i_nb;
 425     int i;
 426
 427
 428     /* Read the entry point sector */
 429     if( ioctl_ReadSectors( VLC_OBJECT(p_access), p_sys->vcddev,
 430         VCD_ENTRIES_SECTOR, sector, 1, VCD_TYPE ) < 0 )
 431     {
 432         msg_Err( p_access, "could not read entry points sector" );
 433         return VLC_EGENERIC;
 434     }
 435     memcpy( &entries, sector, CD_SECTOR_SIZE );
 436
 437     i_nb = GetWBE( &entries.i_entries_nb );
 438     if( i_nb > 500 )
 439     {
 440         msg_Err( p_access, "invalid entry points number" );
 441         return VLC_EGENERIC;
 442     }
 443
 444     if( strncmp( entries.psz_id, "ENTRYVCD", sizeof( entries.psz_id ) ) &&
 445         strncmp( entries.psz_id, "ENTRYSVD", sizeof( entries.psz_id ) ) )
 446     {
 447         msg_Err( p_access, "unrecognized entry points format" );
 448         return VLC_EGENERIC;
 449     }
 450
 451     for( i = 0; i < i_nb; i++ )
 452     {
 453         const int i_title = BCD_TO_BIN(entries.entry[i].i_track) - 2;
 454         const int i_sector =
 455             (MSF_TO_LBA2( BCD_TO_BIN( entries.entry[i].msf.minute ),
 456                           BCD_TO_BIN( entries.entry[i].msf.second ),
 457                           BCD_TO_BIN( entries.entry[i].msf.frame  ) ));
 458         seekpoint_t *s;
 459
 460         if( i_title < 0 )
 461             continue;   /* Should not occur */
 462         if( i_title >= p_sys->i_titles )
 463             continue;
 464
 465         fprintf( stderr, "Entry[%d] title=%d sector=%d\n",
 466                  i, i_title, i_sector );
 467
 468         s = vlc_seekpoint_New();
 469         s->i_byte_offset = (i_sector - p_sys->p_sectors[i_title+1]) * VCD_DATA_SIZE;
 470
 471         TAB_APPEND( p_sys->title[i_title]->i_seekpoint, p_sys->title[i_title]->seekpoint, s );
 472     }
 473
 474 #if 0
 475 #define i_track BCD_TO_BIN(entries.entry[i].i_track)
 476     /* Reset the i_part_nb for each track */
 477     for( i = 0 ; i < i_nb ; i++ )
 478     {
 479         if( i_track <= p_input->stream.i_area_nb )
 480         {
 481             p_input->stream.pp_areas[i_track-1]->i_part_nb = 0;
 482         }
 483     }
 484
 485     for( i = 0 ; i < i_nb ; i++ )
 486     {
 487         if( i_track <= p_input->stream.i_area_nb )
 488         {
 489             p_sys->p_entries[i_entry_index] =
 490                 (MSF_TO_LBA2( BCD_TO_BIN( entries.entry[i].msf.minute ),
 491                               BCD_TO_BIN( entries.entry[i].msf.second ),
 492                               BCD_TO_BIN( entries.entry[i].msf.frame  ) ));
 493             p_input->stream.pp_areas[i_track-1]->i_part_nb ++;
 494             /* if this entry belongs to a new track */
 495             if( i_track != i_previous_track )
 496             {
 497                 /* i_plugin_data is used to store the first entry of the area*/
 498                 p_input->stream.pp_areas[i_track-1]->i_plugin_data =
 499                                                             i_entry_index;
 500                 i_previous_track = i_track;
 501             }
 502             msg_Dbg( p_input, "entry point %i begins at LBA: %i",
 503                      i_entry_index, p_sys->p_entries[i_entry_index] );
 504
 505             i_entry_index ++;
 506             p_sys->i_entries_nb ++;
 507         }
 508         else
 509             msg_Warn( p_input, "wrong track number found in entry points" );
 510     }
 511 #undef i_track
 512     return 0;
 513 #endif
 514     return VLC_EGENERIC;
 515 }
 516
 517 #if 0
 518 /*****************************************************************************
 519  * VCDRead: reads from the VCD into PES packets.
 520  *****************************************************************************
 521  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 522  * bytes.
 523  *****************************************************************************/
 524 static int VCDRead( input_thread_t * p_input, byte_t * p_buffer,
 525                      size_t i_len )
 526 {
 527     access_sys_t *p_sys;
 528     int                     i_blocks;
 529     int                     i_index;
 530     int                     i_read;
 531     byte_t                  p_last_sector[ VCD_DATA_SIZE ];
 532
 533     p_sys = p_input->p_access_data;
 534
 535     i_read = 0;
 536
 537     /* Compute the number of blocks we have to read */
 538
 539     i_blocks = i_len / VCD_DATA_SIZE;
 540
 541     for ( i_index = 0 ; i_index < i_blocks ; i_index++ )
 542     {
 543         if ( ioctl_ReadSectors( VLC_OBJECT(p_input), p_sys->vcddev,
 544              p_sys->i_sector, p_buffer + i_index * VCD_DATA_SIZE, 1,
 545              VCD_TYPE ) < 0 )
 546         {
 547             msg_Err( p_input, "could not read sector %d", p_sys->i_sector );
 548             return -1;
 549         }
 550
 551         p_sys->i_sector ++;
 552         if ( p_sys->i_sector == p_sys->p_sectors[p_sys->i_track + 1] )
 553         {
 554             input_area_t *p_area;
 555
 556             if ( p_sys->i_track >= p_sys->i_nb_tracks - 1 )
 557                 return 0; /* EOF */
 558
 559             vlc_mutex_lock( &p_input->stream.stream_lock );
 560             p_area = p_input->stream.pp_areas[
 561                     p_input->stream.p_selected_area->i_id + 1 ];
 562
 563             msg_Dbg( p_input, "new title" );
 564
 565             p_area->i_part = 1;
 566             VCDSetArea( p_input, p_area );
 567             vlc_mutex_unlock( &p_input->stream.stream_lock );
 568         }
 569
 570         /* Update chapter */
 571         else if( p_sys->b_valid_ep &&
 572                 /* FIXME kludge so that read does not update chapter
 573                  * when a manual chapter change was requested and not
 574                  * yet accomplished */
 575                 !p_input->stream.p_new_area )
 576         {
 577             int i_entry;
 578
 579             vlc_mutex_lock( &p_input->stream.stream_lock );
 580             i_entry = p_input->stream.p_selected_area->i_plugin_data
 581                 /* 1st entry point of the track (area)*/
 582                         + p_input->stream.p_selected_area->i_part - 1;
 583             if( i_entry + 1 < p_sys->i_entries_nb &&
 584                     p_sys->i_sector >= p_sys->p_entries[i_entry + 1] )
 585             {
 586                 vlc_value_t val;
 587
 588                 msg_Dbg( p_input, "new chapter" );
 589                 p_input->stream.p_selected_area->i_part ++;
 590
 591                 /* Update the navigation variables without triggering
 592                  * a callback */
 593                 val.i_int = p_input->stream.p_selected_area->i_part;
 594                 var_Change( p_input, "chapter", VLC_VAR_SETVALUE, &val, NULL );
 595             }
 596             vlc_mutex_unlock( &p_input->stream.stream_lock );
 597         }
 598
 599         i_read += VCD_DATA_SIZE;
 600     }
 601
 602     if ( i_len % VCD_DATA_SIZE ) /* this should not happen */
 603     {
 604         if ( ioctl_ReadSectors( VLC_OBJECT(p_input), p_sys->vcddev,
 605              p_sys->i_sector, p_last_sector, 1, VCD_TYPE ) < 0 )
 606         {
 607             msg_Err( p_input, "could not read sector %d", p_sys->i_sector );
 608             return -1;
 609         }
 610
 611         p_input->p_vlc->pf_memcpy( p_buffer + i_blocks * VCD_DATA_SIZE,
 612                                    p_last_sector, i_len % VCD_DATA_SIZE );
 613         i_read += i_len % VCD_DATA_SIZE;
 614     }
 615
 616     return i_read;
 617 }
 618
 619 /*****************************************************************************
 620  * VCDSetProgram: Does nothing since a VCD is mono_program
 621  *****************************************************************************/
 622 static int VCDSetProgram( input_thread_t * p_input,
 623                           pgrm_descriptor_t * p_program)
 624 {
 625     return 0;
 626 }
 627
 628 /*****************************************************************************
 629  * VCDSetArea: initialize input data for title x, chapter y.
 630  * It should be called for each user navigation request.
 631  ****************************************************************************/
 632 static int VCDSetArea( input_thread_t * p_input, input_area_t * p_area )
 633 {
 634     access_sys_t *p_sys = p_input->p_access_data;
 635     vlc_value_t val;
 636
 637     /* we can't use the interface slider until initilization is complete */
 638     p_input->stream.b_seekable = 0;
 639
 640     if( p_area != p_input->stream.p_selected_area )
 641     {
 642         unsigned int i;
 643
 644         /* Reset the Chapter position of the current title */
 645         p_input->stream.p_selected_area->i_part = 1;
 646         p_input->stream.p_selected_area->i_tell = 0;
 647
 648         /* Change the default area */
 649         p_input->stream.p_selected_area = p_area;
 650
 651         /* Change the current track */
 652         /* The first track is not a valid one  */
 653         p_sys->i_track = p_area->i_id;
 654         p_sys->i_sector = p_sys->p_sectors[p_sys->i_track];
 655
 656         /* Update the navigation variables without triggering a callback */
 657         val.i_int = p_area->i_id;
 658         var_Change( p_input, "title", VLC_VAR_SETVALUE, &val, NULL );
 659         var_Change( p_input, "chapter", VLC_VAR_CLEARCHOICES, NULL, NULL );
 660         for( i = 1; i <= p_area->i_part_nb; i++ )
 661         {
 662             val.i_int = i;
 663             var_Change( p_input, "chapter", VLC_VAR_ADDCHOICE, &val, NULL );
 664         }
 665     }
 666
 667     if( p_sys->b_valid_ep )
 668     {
 669         int i_entry = p_area->i_plugin_data /* 1st entry point of
 670                                                the track (area)*/
 671                             + p_area->i_part - 1;
 672         p_sys->i_sector = p_sys->p_entries[i_entry];
 673     }
 674     else
 675         p_sys->i_sector = p_sys->p_sectors[p_sys->i_track];
 676
 677     p_input->stream.p_selected_area->i_tell =
 678         (off_t)p_sys->i_sector * (off_t)VCD_DATA_SIZE
 679          - p_input->stream.p_selected_area->i_start;
 680
 681     /* warn interface that something has changed */
 682     p_input->stream.b_seekable = 1;
 683     p_input->stream.b_changed = 1;
 684
 685     /* Update the navigation variables without triggering a callback */
 686     val.i_int = p_area->i_part;
 687     var_Change( p_input, "chapter", VLC_VAR_SETVALUE, &val, NULL );
 688
 689     return 0;
 690 }
 691
 692 /****************************************************************************
 693  * VCDSeek
 694  ****************************************************************************/
 695 static void VCDSeek( input_thread_t * p_input, off_t i_off )
 696 {
 697     access_sys_t * p_sys = p_input->p_access_data;
 698     unsigned int i_index;
 699
 700     p_sys->i_sector = p_sys->p_sectors[p_sys->i_track]
 701                        + i_off / (off_t)VCD_DATA_SIZE;
 702
 703     vlc_mutex_lock( &p_input->stream.stream_lock );
 704 #define p_area p_input->stream.p_selected_area
 705     /* Find chapter */
 706     if( p_sys->b_valid_ep )
 707     {
 708         for( i_index = 2 ; i_index <= p_area->i_part_nb; i_index ++ )
 709         {
 710             if( p_sys->i_sector < p_sys->p_entries[p_area->i_plugin_data
 711                 + i_index - 1] )
 712             {
 713                 vlc_value_t val;
 714
 715                 p_area->i_part = i_index - 1;
 716
 717                 /* Update the navigation variables without triggering
 718                  * a callback */
 719                 val.i_int = p_area->i_part;
 720                 var_Change( p_input, "chapter", VLC_VAR_SETVALUE, &val, NULL );
 721                 break;
 722             }
 723         }
 724     }
 725 #undef p_area
 726
 727     p_input->stream.p_selected_area->i_tell =
 728         (off_t)p_sys->i_sector * (off_t)VCD_DATA_SIZE
 729          - p_input->stream.p_selected_area->i_start;
 730     vlc_mutex_unlock( &p_input->stream.stream_lock );
 731 }
 732
 733 /*****************************************************************************
 734  * VCDEntryPoints: Reads the information about the entry points on the disc.
 735  *****************************************************************************/
 736 static int VCDEntryPoints( input_thread_t * p_input )
 737 {
 738     access_sys_t * p_sys = p_input->p_access_data;
 739     byte_t *                          p_sector;
 740     entries_sect_t                    entries;
 741     uint16_t                          i_nb;
 742     int                               i, i_entry_index = 0;
 743     int                               i_previous_track = -1;
 744
 745     p_sector = malloc( VCD_DATA_SIZE * sizeof( byte_t ) );
 746     if( p_sector == NULL )
 747     {
 748         msg_Err( p_input, "not enough memory for entry points treatment" );
 749         return -1;
 750     }
 751
 752     if( ioctl_ReadSectors( VLC_OBJECT(p_input), p_sys->vcddev,
 753         VCD_ENTRIES_SECTOR, p_sector, 1, VCD_TYPE ) < 0 )
 754     {
 755         msg_Err( p_input, "could not read entry points sector" );
 756         free( p_sector );
 757         return( -1 );
 758     }
 759
 760     memcpy( &entries, p_sector, CD_SECTOR_SIZE );
 761     free( p_sector );
 762
 763     if( (i_nb = U16_AT( &entries.i_entries_nb )) > 500 )
 764     {
 765         msg_Err( p_input, "invalid entry points number" );
 766         return( -1 );
 767     }
 768
 769     p_sys->p_entries = malloc( sizeof( int ) * i_nb );
 770     if( p_sys->p_entries == NULL )
 771     {
 772         msg_Err( p_input, "not enough memory for entry points treatment" );
 773         return -1;
 774     }
 775
 776     if( strncmp( entries.psz_id, "ENTRYVCD", sizeof( entries.psz_id ) )
 777      && strncmp( entries.psz_id, "ENTRYSVD", sizeof( entries.psz_id ) ))
 778     {
 779         msg_Err( p_input, "unrecognized entry points format" );
 780         free( p_sys->p_entries );
 781         return -1;
 782     }
 783
 784     p_sys->i_entries_nb = 0;
 785
 786 #define i_track BCD_TO_BIN(entries.entry[i].i_track)
 787     /* Reset the i_part_nb for each track */
 788     for( i = 0 ; i < i_nb ; i++ )
 789     {
 790         if( i_track <= p_input->stream.i_area_nb )
 791         {
 792             p_input->stream.pp_areas[i_track-1]->i_part_nb = 0;
 793         }
 794     }
 795
 796     for( i = 0 ; i < i_nb ; i++ )
 797     {
 798         if( i_track <= p_input->stream.i_area_nb )
 799         {
 800             p_sys->p_entries[i_entry_index] =
 801                 (MSF_TO_LBA2( BCD_TO_BIN( entries.entry[i].msf.minute ),
 802                               BCD_TO_BIN( entries.entry[i].msf.second ),
 803                               BCD_TO_BIN( entries.entry[i].msf.frame  ) ));
 804             p_input->stream.pp_areas[i_track-1]->i_part_nb ++;
 805             /* if this entry belongs to a new track */
 806             if( i_track != i_previous_track )
 807             {
 808                 /* i_plugin_data is used to store the first entry of the area*/
 809                 p_input->stream.pp_areas[i_track-1]->i_plugin_data =
 810                                                             i_entry_index;
 811                 i_previous_track = i_track;
 812             }
 813             msg_Dbg( p_input, "entry point %i begins at LBA: %i",
 814                      i_entry_index, p_sys->p_entries[i_entry_index] );
 815
 816             i_entry_index ++;
 817             p_sys->i_entries_nb ++;
 818         }
 819         else
 820             msg_Warn( p_input, "wrong track number found in entry points" );
 821     }
 822 #undef i_track
 823     return 0;
 824 }
 825 #endif