libhb/dvd.c

   1 /* $Id: dvd.c,v 1.12 2005/11/25 15:05:25 titer Exp $
   2
   3    This file is part of the HandBrake source code.
   4    Homepage: <http://handbrake.m0k.org/>.
   5    It may be used under the terms of the GNU General Public License. */
   6
   7 #include "hb.h"
   8 #include "lang.h"
   9
  10 #include "dvdread/ifo_read.h"
  11 #include "dvdread/nav_read.h"
  12
  13 struct hb_dvd_s
  14 {
  15     char         * path;
  16
  17     dvd_reader_t * reader;
  18     ifo_handle_t * vmg;
  19
  20     int            vts;
  21     int            ttn;
  22     ifo_handle_t * ifo;
  23     dvd_file_t   * file;
  24
  25     pgc_t        * pgc;
  26     int            cell_start;
  27     int            cell_end;
  28     int            title_start;
  29     int            title_end;
  30     int            title_block_count;
  31     int            cell_cur;
  32     int            cell_next;
  33     int            cell_overlap;
  34     int            block;
  35     int            pack_len;
  36     int            next_vobu;
  37 };
  38
  39 /***********************************************************************
  40  * Local prototypes
  41  **********************************************************************/
  42 static void FindNextCell( hb_dvd_t * );
  43 static int  dvdtime2msec( dvd_time_t * );
  44
  45 char * hb_dvd_name( char * path )
  46 {
  47     static char name[1024];
  48     unsigned char unused[1024];
  49     dvd_reader_t * reader;
  50
  51     reader = DVDOpen( path );
  52     if( !reader )
  53     {
  54         return NULL;
  55     }
  56
  57     if( DVDUDFVolumeInfo( reader, name, sizeof( name ),
  58                           unused, sizeof( unused ) ) )
  59     {
  60         DVDClose( reader );
  61         return NULL;
  62     }
  63
  64     DVDClose( reader );
  65     return name;
  66 }
  67
  68 /***********************************************************************
  69  * hb_dvd_init
  70  ***********************************************************************
  71  *
  72  **********************************************************************/
  73 hb_dvd_t * hb_dvd_init( char * path )
  74 {
  75     hb_dvd_t * d;
  76
  77     d = calloc( sizeof( hb_dvd_t ), 1 );
  78
  79     /* Open device */
  80     if( !( d->reader = DVDOpen( path ) ) )
  81     {
  82         hb_log( "dvd: DVDOpen failed (%s)", path );
  83         goto fail;
  84     }
  85
  86     /* Open main IFO */
  87     if( !( d->vmg = ifoOpen( d->reader, 0 ) ) )
  88     {
  89         hb_log( "dvd: ifoOpen failed" );
  90         goto fail;
  91     }
  92
  93     d->path = strdup( path );
  94
  95     return d;
  96
  97 fail:
  98     if( d->vmg )    ifoClose( d->vmg );
  99     if( d->reader ) DVDClose( d->reader );
 100     free( d );
 101     return NULL;
 102 }
 103
 104 /***********************************************************************
 105  * hb_dvd_title_count
 106  **********************************************************************/
 107 int hb_dvd_title_count( hb_dvd_t * d )
 108 {
 109     return d->vmg->tt_srpt->nr_of_srpts;
 110 }
 111
 112 /***********************************************************************
 113  * hb_dvd_title_scan
 114  **********************************************************************/
 115 hb_title_t * hb_dvd_title_scan( hb_dvd_t * d, int t )
 116 {
 117
 118     hb_title_t   * title;
 119     ifo_handle_t * vts = NULL;
 120     int            pgc_id, pgn, i;
 121     hb_chapter_t * chapter, * chapter_old;
 122     int            c;
 123     uint64_t       duration;
 124     float          duration_correction;
 125     unsigned char  unused[1024];
 126
 127     hb_log( "scan: scanning title %d", t );
 128
 129     title = hb_title_init( d->path, t );
 130     if( DVDUDFVolumeInfo( d->reader, title->name, sizeof( title->name ),
 131                           unused, sizeof( unused ) ) )
 132     {
 133         char * p_cur, * p_last = d->path;
 134         for( p_cur = d->path; *p_cur; p_cur++ )
 135         {
 136             if( p_cur[0] == '/' && p_cur[1] )
 137             {
 138                 p_last = &p_cur[1];
 139             }
 140         }
 141         snprintf( title->name, sizeof( title->name ), "%s", p_last );
 142     }
 143
 144     /* VTS which our title is in */
 145     title->vts = d->vmg->tt_srpt->title[t-1].title_set_nr;
 146
 147     hb_log( "scan: opening IFO for VTS %d", title->vts );
 148     if( !( vts = ifoOpen( d->reader, title->vts ) ) )
 149     {
 150         hb_log( "scan: ifoOpen failed" );
 151         goto fail;
 152     }
 153
 154     /* Position of the title in the VTS */
 155     title->ttn = d->vmg->tt_srpt->title[t-1].vts_ttn;
 156
 157     /* Get pgc */
 158     pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgcn;
 159     pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgn;
 160     d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 161
 162     /* Start cell */
 163     title->cell_start  = d->pgc->program_map[pgn-1] - 1;
 164     title->block_start = d->pgc->cell_playback[title->cell_start].first_sector;
 165
 166     /* End cell */
 167     title->cell_end  = d->pgc->nr_of_cells - 1;
 168     title->block_end = d->pgc->cell_playback[title->cell_end].last_sector;
 169
 170     /* Block count */
 171     title->block_count = 0;
 172     d->cell_cur = title->cell_start;
 173     while( d->cell_cur <= title->cell_end )
 174     {
 175 #define cp d->pgc->cell_playback[d->cell_cur]
 176         title->block_count += cp.last_sector + 1 - cp.first_sector;
 177 #undef cp
 178         FindNextCell( d );
 179         d->cell_cur = d->cell_next;
 180     }
 181
 182     hb_log( "scan: vts=%d, ttn=%d, cells=%d->%d, blocks=%d->%d, "
 183             "%d blocks", title->vts, title->ttn, title->cell_start,
 184             title->cell_end, title->block_start, title->block_end,
 185             title->block_count );
 186
 187     if( title->block_count < 2048  )
 188     {
 189         hb_log( "scan: title too short (%d blocks), ignoring",
 190                 title->block_count );
 191         goto fail;
 192     }
 193
 194
 195     /* Get duration */
 196     title->duration = 90LL * dvdtime2msec( &d->pgc->playback_time );
 197     title->hours    = title->duration / 90000 / 3600;
 198     title->minutes  = ( ( title->duration / 90000 ) % 3600 ) / 60;
 199     title->seconds  = ( title->duration / 90000 ) % 60;
 200     hb_log( "scan: duration is %02d:%02d:%02d (%lld ms)",
 201             title->hours, title->minutes, title->seconds,
 202             title->duration / 90 );
 203
 204     /* Discard titles under 10 seconds */
 205     if( !( title->hours | title->minutes ) && title->seconds < 10 )
 206     {
 207         hb_log( "scan: ignoring title (too short)" );
 208         goto fail;
 209     }
 210
 211     /* Detect languages */
 212     for( i = 0; i < vts->vtsi_mat->nr_of_vts_audio_streams; i++ )
 213     {
 214         hb_audio_t * audio, * audio_tmp;
 215         int          audio_format, lang_code, audio_control,
 216                      position, j;
 217         iso639_lang_t * lang;
 218
 219         hb_log( "scan: checking audio %d", i + 1 );
 220
 221         audio = calloc( sizeof( hb_audio_t ), 1 );
 222
 223         audio_format  = vts->vtsi_mat->vts_audio_attr[i].audio_format;
 224         lang_code     = vts->vtsi_mat->vts_audio_attr[i].lang_code;
 225         audio_control =
 226             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->audio_control[i];
 227
 228         if( !( audio_control & 0x8000 ) )
 229         {
 230             hb_log( "scan: audio channel is not active" );
 231             free( audio );
 232             continue;
 233         }
 234
 235         position = ( audio_control & 0x7F00 ) >> 8;
 236
 237         switch( audio_format )
 238         {
 239             case 0x00:
 240                 audio->id    = ( ( 0x80 + position ) << 8 ) | 0xbd;
 241                 audio->codec = HB_ACODEC_AC3;
 242                 break;
 243
 244             case 0x02:
 245             case 0x03:
 246                 audio->id    = 0xc0 + position;
 247                 audio->codec = HB_ACODEC_MPGA;
 248                 break;
 249
 250             case 0x04:
 251                 audio->id    = ( ( 0xa0 + position ) << 8 ) | 0xbd;
 252                 audio->codec = HB_ACODEC_LPCM;
 253                 break;
 254
 255             case 0x06:
 256                 audio->id    = ( ( 0x88 + position ) << 8 ) | 0xbd;
 257                 audio->codec = HB_ACODEC_DCA;
 258                 break;
 259
 260             default:
 261                 audio->id    = 0;
 262                 audio->codec = 0;
 263                 hb_log( "scan: unknown audio codec (%x)",
 264                         audio_format );
 265                 break;
 266         }
 267         if( !audio->id )
 268         {
 269             continue;
 270         }
 271
 272         /* Check for duplicate tracks */
 273         audio_tmp = NULL;
 274         for( j = 0; j < hb_list_count( title->list_audio ); j++ )
 275         {
 276             audio_tmp = hb_list_item( title->list_audio, j );
 277             if( audio->id == audio_tmp->id )
 278             {
 279                 break;
 280             }
 281             audio_tmp = NULL;
 282         }
 283         if( audio_tmp )
 284         {
 285             hb_log( "scan: duplicate audio track" );
 286             free( audio );
 287             continue;
 288         }
 289
 290         lang = lang_for_code( vts->vtsi_mat->vts_audio_attr[i].lang_code );
 291
 292         snprintf( audio->lang, sizeof( audio->lang ), "%s (%s)",
 293             strlen(lang->native_name) ? lang->native_name : lang->eng_name,
 294             audio->codec == HB_ACODEC_AC3 ? "AC3" : ( audio->codec ==
 295                 HB_ACODEC_DCA ? "DTS" : ( audio->codec ==
 296                 HB_ACODEC_MPGA ? "MPEG" : "LPCM" ) ) );
 297         snprintf( audio->lang_simple, sizeof( audio->lang_simple ), "%s",
 298                   strlen(lang->native_name) ? lang->native_name : lang->eng_name );
 299         snprintf( audio->iso639_2, sizeof( audio->iso639_2 ), "%s",
 300                   lang->iso639_2);
 301
 302         hb_log( "scan: id=%x, lang=%s, 3cc=%s", audio->id,
 303                 audio->lang, audio->iso639_2 );
 304
 305         hb_list_add( title->list_audio, audio );
 306     }
 307
 308     if( !hb_list_count( title->list_audio ) )
 309     {
 310         hb_log( "scan: ignoring title (no audio track)" );
 311         goto fail;
 312     }
 313
 314     memcpy( title->palette,
 315             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->palette,
 316             16 * sizeof( uint32_t ) );
 317
 318     /* Check for subtitles */
 319     for( i = 0; i < vts->vtsi_mat->nr_of_vts_subp_streams; i++ )
 320     {
 321         hb_subtitle_t * subtitle;
 322         int spu_control;
 323         int position;
 324         iso639_lang_t * lang;
 325
 326         hb_log( "scan: checking subtitle %d", i + 1 );
 327
 328         spu_control =
 329             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->subp_control[i];
 330
 331         if( !( spu_control & 0x80000000 ) )
 332         {
 333             hb_log( "scan: subtitle channel is not active" );
 334             continue;
 335         }
 336
 337         if( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 338         {
 339             switch( vts->vtsi_mat->vts_video_attr.permitted_df )
 340             {
 341                 case 1:
 342                     position = spu_control & 0xFF;
 343                     break;
 344                 case 2:
 345                     position = ( spu_control >> 8 ) & 0xFF;
 346                     break;
 347                 default:
 348                     position = ( spu_control >> 16 ) & 0xFF;
 349             }
 350         }
 351         else
 352         {
 353             position = ( spu_control >> 24 ) & 0x7F;
 354         }
 355
 356         lang = lang_for_code( vts->vtsi_mat->vts_subp_attr[i].lang_code );
 357
 358         subtitle = calloc( sizeof( hb_subtitle_t ), 1 );
 359         subtitle->id = ( ( 0x20 + position ) << 8 ) | 0xbd;
 360         snprintf( subtitle->lang, sizeof( subtitle->lang ), "%s",
 361              strlen(lang->native_name) ? lang->native_name : lang->eng_name);
 362        snprintf( subtitle->iso639_2, sizeof( subtitle->iso639_2 ), "%s",
 363                  lang->iso639_2);
 364
 365         hb_log( "scan: id=%x, lang=%s, 3cc=%s", subtitle->id,
 366                 subtitle->lang, subtitle->iso639_2 );
 367
 368         hb_list_add( title->list_subtitle, subtitle );
 369     }
 370
 371     /* Chapters */
 372     hb_log( "scan: title %d has %d chapters", t,
 373             vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts );
 374     for( i = 0, c = 1;
 375          i < vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts; i++ )
 376     {
 377         int pgc_id_next, pgn_next;
 378         pgc_t * pgc_next;
 379
 380         chapter = calloc( sizeof( hb_chapter_t ), 1 );
 381         chapter->index = c;
 382
 383         pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgcn;
 384         pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgn;
 385         d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 386
 387         /* Start cell */
 388         chapter->cell_start  = d->pgc->program_map[pgn-1] - 1;
 389         chapter->block_start =
 390             d->pgc->cell_playback[chapter->cell_start].first_sector;
 391
 392         /* End cell */
 393         if( i != vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts - 1 )
 394         {
 395             /* The cell before the starting cell of the next chapter,
 396                or... */
 397             pgc_id_next = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i+1].pgcn;
 398             pgn_next    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i+1].pgn;
 399             pgc_next    = vts->vts_pgcit->pgci_srp[pgc_id_next-1].pgc;
 400             chapter->cell_end = pgc_next->program_map[pgn_next-1] - 2;
 401             if( chapter->cell_end < 0 )
 402             {
 403                 /* Huh? */
 404                 free( chapter );
 405                 continue;
 406             }
 407         }
 408         else
 409         {
 410             /* ... the last cell of the title */
 411             chapter->cell_end = title->cell_end;
 412         }
 413         chapter->block_end =
 414             d->pgc->cell_playback[chapter->cell_end].last_sector;
 415
 416         /* Block count, duration */
 417         pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgcn;
 418         pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgn;
 419         d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 420         chapter->block_count = 0;
 421         chapter->duration = 0;
 422
 423         d->cell_cur = chapter->cell_start;
 424         while( d->cell_cur <= chapter->cell_end )
 425         {
 426 #define cp d->pgc->cell_playback[d->cell_cur]
 427             chapter->block_count += cp.last_sector + 1 - cp.first_sector;
 428             chapter->duration += 90LL * dvdtime2msec( &cp.playback_time );
 429 #undef cp
 430             FindNextCell( d );
 431             d->cell_cur = d->cell_next;
 432         }
 433
 434         if( chapter->block_count < 2048 && chapter->index > 1 )
 435         {
 436             hb_log( "scan: chapter %d too short (%d blocks, "
 437                     "cells=%d->%d), merging", chapter->index,
 438                     chapter->block_count, chapter->cell_start,
 439                     chapter->cell_end );
 440             chapter_old = hb_list_item( title->list_chapter,
 441                                         chapter->index - 2 );
 442             chapter_old->cell_end    = chapter->cell_end;
 443             chapter_old->block_end   = chapter->block_end;
 444             chapter_old->block_count += chapter->block_count;
 445             free( chapter );
 446             chapter = chapter_old;
 447         }
 448         else
 449         {
 450             hb_list_add( title->list_chapter, chapter );
 451             c++;
 452         }
 453     }
 454
 455     /* The durations we get for chapters aren't precise. Scale them so
 456        the total matches the title duration */
 457     duration = 0;
 458     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 459     {
 460         chapter = hb_list_item( title->list_chapter, i );
 461         duration += chapter->duration;
 462     }
 463     duration_correction = (float) title->duration / (float) duration;
 464     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 465     {
 466         int seconds;
 467         chapter            = hb_list_item( title->list_chapter, i );
 468         chapter->duration  = duration_correction * chapter->duration;
 469         seconds            = ( chapter->duration + 45000 ) / 90000;
 470         chapter->hours     = seconds / 3600;
 471         chapter->minutes   = ( seconds % 3600 ) / 60;
 472         chapter->seconds   = seconds % 60;
 473
 474         hb_log( "scan: chap %d c=%d->%d, b=%d->%d (%d), %lld ms",
 475                 chapter->index, chapter->cell_start, chapter->cell_end,
 476                 chapter->block_start, chapter->block_end,
 477                 chapter->block_count, chapter->duration / 90 );
 478     }
 479
 480     /* Get aspect. We don't get width/height/rate infos here as
 481        they tend to be wrong */
 482     switch( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 483     {
 484         case 0:
 485             title->aspect = HB_ASPECT_BASE * 4 / 3;
 486             break;
 487         case 3:
 488             title->aspect = HB_ASPECT_BASE * 16 / 9;
 489             break;
 490         default:
 491             hb_log( "scan: unknown aspect" );
 492             goto fail;
 493     }
 494
 495     hb_log( "scan: aspect = %d", title->aspect );
 496
 497     /* This title is ok so far */
 498     goto cleanup;
 499
 500 fail:
 501     hb_list_close( &title->list_audio );
 502     free( title );
 503     title = NULL;
 504
 505 cleanup:
 506     if( vts ) ifoClose( vts );
 507
 508     return title;
 509 }
 510
 511 /***********************************************************************
 512  * hb_dvd_start
 513  ***********************************************************************
 514  * Title and chapter start at 1
 515  **********************************************************************/
 516 int hb_dvd_start( hb_dvd_t * d, int title, int chapter )
 517 {
 518     int pgc_id, pgn;
 519     int i;
 520
 521     /* Open the IFO and the VOBs for this title */
 522     d->vts = d->vmg->tt_srpt->title[title-1].title_set_nr;
 523     d->ttn = d->vmg->tt_srpt->title[title-1].vts_ttn;
 524     if( !( d->ifo = ifoOpen( d->reader, d->vts ) ) )
 525     {
 526         hb_log( "dvd: ifoOpen failed for VTS %d", d->vts );
 527         return 0;
 528     }
 529     if( !( d->file = DVDOpenFile( d->reader, d->vts,
 530                                   DVD_READ_TITLE_VOBS ) ) )
 531     {
 532         hb_log( "dvd: DVDOpenFile failed for VTS %d", d->vts );
 533         return 0;
 534     }
 535
 536     /* Get title first and last blocks */
 537     pgc_id         = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgcn;
 538     pgn            = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgn;
 539     d->pgc         = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 540     d->cell_start  = d->pgc->program_map[pgn - 1] - 1;
 541     d->cell_end    = d->pgc->nr_of_cells - 1;
 542     d->title_start = d->pgc->cell_playback[d->cell_start].first_sector;
 543     d->title_end   = d->pgc->cell_playback[d->cell_end].last_sector;
 544
 545     /* Block count */
 546     d->title_block_count = 0;
 547     for( i = d->cell_start; i <= d->cell_end; i++ )
 548     {
 549         d->title_block_count += d->pgc->cell_playback[i].last_sector + 1 -
 550             d->pgc->cell_playback[i].first_sector;
 551     }
 552
 553     /* Get pgc for the current chapter */
 554     pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgcn;
 555     pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgn;
 556     d->pgc = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 557
 558     /* Get the two first cells */
 559     d->cell_cur = d->pgc->program_map[pgn-1] - 1;
 560     FindNextCell( d );
 561
 562     d->block     = d->pgc->cell_playback[d->cell_cur].first_sector;
 563     d->next_vobu = d->block;
 564     d->pack_len  = 0;
 565     d->cell_overlap = 0;
 566
 567     return 1;
 568 }
 569
 570 /***********************************************************************
 571  * hb_dvd_stop
 572  ***********************************************************************
 573  *
 574  **********************************************************************/
 575 void hb_dvd_stop( hb_dvd_t * d )
 576 {
 577     if( d->ifo )
 578     {
 579         ifoClose( d->ifo );
 580         d->ifo = NULL;
 581     }
 582     if( d->file )
 583     {
 584         DVDCloseFile( d->file );
 585         d->file = NULL;
 586     }
 587 }
 588
 589 /***********************************************************************
 590  * hb_dvd_seek
 591  ***********************************************************************
 592  *
 593  **********************************************************************/
 594 int hb_dvd_seek( hb_dvd_t * d, float f )
 595 {
 596     int count, sizeCell;
 597     int i;
 598
 599     count = f * d->title_block_count;
 600
 601     for( i = d->cell_start; i <= d->cell_end; i++ )
 602     {
 603         sizeCell = d->pgc->cell_playback[i].last_sector + 1 -
 604             d->pgc->cell_playback[i].first_sector;
 605
 606         if( count < sizeCell )
 607         {
 608             d->cell_cur = i;
 609             FindNextCell( d );
 610
 611             /* Now let hb_dvd_read find the next VOBU */
 612             d->next_vobu = d->pgc->cell_playback[i].first_sector + count;
 613             d->pack_len  = 0;
 614             break;
 615         }
 616
 617         count -= sizeCell;
 618     }
 619
 620     if( i > d->cell_end )
 621     {
 622         return 0;
 623     }
 624
 625     return 1;
 626 }
 627
 628
 629 /***********************************************************************
 630  * is_nav_pack
 631  ***********************************************************************
 632  * Pretty much directly lifted from libdvdread's play_title function.
 633  **********************************************************************/
 634 int is_nav_pack( unsigned char *buf )
 635 {
 636     return ( buf[41] == 0xbf && buf[1027] == 0xbf );
 637 }
 638
 639
 640 /***********************************************************************
 641  * hb_dvd_read
 642  ***********************************************************************
 643  *
 644  **********************************************************************/
 645 int hb_dvd_read( hb_dvd_t * d, hb_buffer_t * b )
 646 {
 647     if( !d->pack_len )
 648     {
 649         /* New pack */
 650         dsi_t dsi_pack;
 651         int   error;
 652
 653         error = 0;
 654
 655         for( ;; )
 656         {
 657             int block, pack_len, next_vobu;
 658
 659             if( DVDReadBlocks( d->file, d->next_vobu, 1, b->data ) != 1 )
 660             {
 661                 hb_log( "dvd: Unrecoverable Read Error from DVD, probable HD or DVD Failure (blk: %d)", d->next_vobu );
 662                 return 0;
 663             }
 664
 665             if ( !is_nav_pack( b->data ) ) {
 666                 (d->next_vobu)++;
 667                 continue;
 668             }
 669
 670             navRead_DSI( &dsi_pack, &b->data[DSI_START_BYTE] );
 671
 672             block     = dsi_pack.dsi_gi.nv_pck_lbn;
 673             pack_len  = dsi_pack.dsi_gi.vobu_ea;
 674             next_vobu = block + ( dsi_pack.vobu_sri.next_vobu & 0x7fffffff );
 675
 676             if( pack_len >  0    &&
 677                 pack_len <  1024 &&
 678                 block    >= d->next_vobu &&
 679                 ( block <= d->title_start + d->title_block_count ||
 680                   block <= d->title_end ) )
 681             {
 682                 /* XXX
 683                    This looks like a valid VOBU, but actually we are
 684                    just hoping */
 685                 if( error )
 686                 {
 687 #if 0
 688                     hb_log( "dvd: found VOBU at %d (b %d, l %d, n %d)",
 689                             d->next_vobu, block, pack_len, next_vobu );
 690 #endif
 691                 }
 692                 d->block     = block;
 693                 d->pack_len  = pack_len;
 694                 d->next_vobu = next_vobu;
 695                 break;
 696             }
 697
 698             /* Wasn't a valid VOBU, try next block */
 699             if( !error )
 700             {
 701 #if 0
 702                 hb_log( "dvd: looking for a VOBU (%d)", d->next_vobu );
 703 #endif
 704             }
 705
 706             if( ++error > 1024 )
 707             {
 708                 hb_log( "dvd: couldn't find a VOBU after 1024 blocks" );
 709                 return 0;
 710             }
 711
 712             (d->next_vobu)++;
 713         }
 714
 715         if( dsi_pack.vobu_sri.next_vobu == SRI_END_OF_CELL )
 716         {
 717             d->cell_cur  = d->cell_next;
 718             d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
 719             FindNextCell( d );
 720             d->cell_overlap = 1;
 721             hb_log("DVD: End of Cell");
 722         }
 723
 724         // Revert the cell overlap, and check for a chapter break
 725         if( dsi_pack.vobu_sri.prev_vobu == SRI_END_OF_CELL )
 726         {
 727             hb_log("DVD: Beginning of Cell");
 728             if( d->cell_overlap )
 729             {
 730                 b->new_chap = hb_dvd_is_break( d );
 731                 d->cell_overlap = 0;
 732             }
 733         }
 734     }
 735     else
 736     {
 737         if( DVDReadBlocks( d->file, d->block, 1, b->data ) != 1 )
 738         {
 739             hb_log( "reader: DVDReadBlocks failed (%d)", d->block );
 740             return 0;
 741         }
 742         d->pack_len--;
 743     }
 744
 745     d->block++;
 746
 747     return 1;
 748 }
 749
 750 /***********************************************************************
 751  * hb_dvd_chapter
 752  ***********************************************************************
 753  * Returns in which chapter the next block to be read is.
 754  * Chapter numbers start at 1.
 755  **********************************************************************/
 756 int hb_dvd_chapter( hb_dvd_t * d )
 757 {
 758     int     i;
 759     int     pgc_id, pgn;
 760         int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
 761     pgc_t * pgc;
 762
 763     for( i = nr_of_ptts - 1;
 764          i >= 0;
 765          i-- )
 766     {
 767         /* Get pgc for chapter (i+1) */
 768         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
 769         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
 770         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 771
 772         if( d->cell_cur - d->cell_overlap >= pgc->program_map[pgn-1] - 1 &&
 773             d->cell_cur - d->cell_overlap <= pgc->nr_of_cells - 1 )
 774         {
 775             /* We are in this chapter */
 776             return i + 1;
 777         }
 778     }
 779
 780     /* End of title */
 781     return -1;
 782 }
 783
 784 /***********************************************************************
 785  * hb_dvd_is_break
 786  ***********************************************************************
 787  * Returns 1 if the current block is a new chapter start
 788  **********************************************************************/
 789 int hb_dvd_is_break( hb_dvd_t * d )
 790 {
 791     int     i, j;
 792     int     pgc_id, pgn;
 793         int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
 794     pgc_t * pgc;
 795     int     cell, chapter_length, cell_end;
 796
 797     for( i = nr_of_ptts - 1;
 798          i > 0;
 799          i-- )
 800     {
 801         /* Get pgc for chapter (i+1) */
 802         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
 803         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
 804         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 805         cell   = pgc->program_map[pgn-1] - 1;
 806
 807         if( cell <= d->cell_start )
 808             break;
 809
 810         // This must not match against the start cell.
 811         if( pgc->cell_playback[cell].first_sector == d->block && cell != d->cell_start )
 812         {
 813             /* Check to see if we merged this chapter into the previous one... */
 814             /* As a note, merging chapters is probably bad practice for this very reason */
 815             chapter_length = 0;
 816
 817             if( i == nr_of_ptts - 1 )
 818             {
 819                 cell_end = d->pgc->nr_of_cells;
 820             }
 821             else
 822             {
 823                 cell_end = pgc->program_map[pgn] - 1;
 824             }
 825
 826             for( j = cell; j < cell_end; j++ )
 827             {
 828                 chapter_length += pgc->cell_playback[j].last_sector + 1 -
 829                                   pgc->cell_playback[j].first_sector;
 830             }
 831
 832             if( chapter_length >= 2048 )
 833             {
 834                 hb_log("DVD: Chapter Break Cell Found");
 835                 /* We have a chapter break */
 836                 return 1;
 837             }
 838             else
 839             {
 840                 hb_log("DVD: Cell Found (%d)", chapter_length);
 841             }
 842         }
 843     }
 844
 845     return 0;
 846 }
 847
 848 /***********************************************************************
 849  * hb_dvd_close
 850  ***********************************************************************
 851  * Closes and frees everything
 852  **********************************************************************/
 853 void hb_dvd_close( hb_dvd_t ** _d )
 854 {
 855     hb_dvd_t * d = *_d;
 856
 857     if( d->vmg )
 858     {
 859         ifoClose( d->vmg );
 860     }
 861     if( d->reader )
 862     {
 863         DVDClose( d->reader );
 864     }
 865
 866     free( d );
 867     *_d = NULL;
 868 }
 869
 870 /***********************************************************************
 871  * FindNextCell
 872  ***********************************************************************
 873  * Assumes pgc and cell_cur are correctly set, and sets cell_next to the
 874  * cell to be read when we will be done with cell_cur.
 875  **********************************************************************/
 876 static void FindNextCell( hb_dvd_t * d )
 877 {
 878     int i = 0;
 879
 880     if( d->pgc->cell_playback[d->cell_cur].block_type ==
 881             BLOCK_TYPE_ANGLE_BLOCK )
 882     {
 883
 884         while( d->pgc->cell_playback[d->cell_cur+i].block_mode !=
 885                    BLOCK_MODE_LAST_CELL )
 886         {
 887              i++;
 888         }
 889         d->cell_next = d->cell_cur + i + 1;
 890     }
 891     else
 892     {
 893         d->cell_next = d->cell_cur + 1;
 894     }
 895 }
 896
 897 /***********************************************************************
 898  * dvdtime2msec
 899  ***********************************************************************
 900  * From lsdvd
 901  **********************************************************************/
 902 static int dvdtime2msec(dvd_time_t * dt)
 903 {
 904     double frames_per_s[4] = {-1.0, 25.00, -1.0, 29.97};
 905     double fps = frames_per_s[(dt->frame_u & 0xc0) >> 6];
 906     long   ms;
 907     ms  = (((dt->hour &   0xf0) >> 3) * 5 + (dt->hour   & 0x0f)) * 3600000;
 908     ms += (((dt->minute & 0xf0) >> 3) * 5 + (dt->minute & 0x0f)) * 60000;
 909     ms += (((dt->second & 0xf0) >> 3) * 5 + (dt->second & 0x0f)) * 1000;
 910
 911     if( fps > 0 )
 912     {
 913         ms += ((dt->frame_u & 0x30) >> 3) * 5 +
 914               (dt->frame_u & 0x0f) * 1000.0 / fps;
 915     }
 916
 917     return ms;
 918 }