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.fr/>.
   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     int            in_cell;
  38     int            in_sync;
  39     uint16_t       cur_vob_id;
  40     uint8_t        cur_cell_id;
  41 };
  42
  43 /***********************************************************************
  44  * Local prototypes
  45  **********************************************************************/
  46 static void FindNextCell( hb_dvd_t * );
  47 static int  dvdtime2msec( dvd_time_t * );
  48
  49 char * hb_dvd_name( char * path )
  50 {
  51     static char name[1024];
  52     unsigned char unused[1024];
  53     dvd_reader_t * reader;
  54
  55     reader = DVDOpen( path );
  56     if( !reader )
  57     {
  58         return NULL;
  59     }
  60
  61     if( DVDUDFVolumeInfo( reader, name, sizeof( name ),
  62                           unused, sizeof( unused ) ) )
  63     {
  64         DVDClose( reader );
  65         return NULL;
  66     }
  67
  68     DVDClose( reader );
  69     return name;
  70 }
  71
  72 /***********************************************************************
  73  * hb_dvd_init
  74  ***********************************************************************
  75  *
  76  **********************************************************************/
  77 hb_dvd_t * hb_dvd_init( char * path )
  78 {
  79     hb_dvd_t * d;
  80
  81     d = calloc( sizeof( hb_dvd_t ), 1 );
  82
  83     /* Open device */
  84     if( !( d->reader = DVDOpen( path ) ) )
  85     {
  86         /*
  87          * Not an error, may be a stream - which we'll try in a moment.
  88          */
  89         hb_log( "dvd: not a dvd - trying as a stream/file instead" );
  90         goto fail;
  91     }
  92
  93     /* Open main IFO */
  94     if( !( d->vmg = ifoOpen( d->reader, 0 ) ) )
  95     {
  96         hb_error( "dvd: ifoOpen failed" );
  97         goto fail;
  98     }
  99
 100     d->path = strdup( path );
 101
 102     return d;
 103
 104 fail:
 105     if( d->vmg )    ifoClose( d->vmg );
 106     if( d->reader ) DVDClose( d->reader );
 107     free( d );
 108     return NULL;
 109 }
 110
 111 /***********************************************************************
 112  * hb_dvd_title_count
 113  **********************************************************************/
 114 int hb_dvd_title_count( hb_dvd_t * d )
 115 {
 116     return d->vmg->tt_srpt->nr_of_srpts;
 117 }
 118
 119 /***********************************************************************
 120  * hb_dvd_title_scan
 121  **********************************************************************/
 122 hb_title_t * hb_dvd_title_scan( hb_dvd_t * d, int t )
 123 {
 124
 125     hb_title_t   * title;
 126     ifo_handle_t * vts = NULL;
 127     int            pgc_id, pgn, i;
 128     hb_chapter_t * chapter;
 129     int            c;
 130     uint64_t       duration;
 131     float          duration_correction;
 132     unsigned char  unused[1024];
 133
 134     hb_log( "scan: scanning title %d", t );
 135
 136     title = hb_title_init( d->path, t );
 137     if( DVDUDFVolumeInfo( d->reader, title->name, sizeof( title->name ),
 138                           unused, sizeof( unused ) ) )
 139     {
 140         char * p_cur, * p_last = d->path;
 141         for( p_cur = d->path; *p_cur; p_cur++ )
 142         {
 143             if( p_cur[0] == '/' && p_cur[1] )
 144             {
 145                 p_last = &p_cur[1];
 146             }
 147         }
 148         snprintf( title->name, sizeof( title->name ), "%s", p_last );
 149     }
 150
 151     /* VTS which our title is in */
 152     title->vts = d->vmg->tt_srpt->title[t-1].title_set_nr;
 153
 154     if ( !title->vts )
 155     {
 156         /* A VTS of 0 means the title wasn't found in the title set */
 157         hb_error("Invalid VTS (title set) number: %i", title->vts);
 158         goto fail;
 159     }
 160
 161     hb_log( "scan: opening IFO for VTS %d", title->vts );
 162     if( !( vts = ifoOpen( d->reader, title->vts ) ) )
 163     {
 164         hb_error( "scan: ifoOpen failed" );
 165         goto fail;
 166     }
 167
 168     /* ignore titles with bogus cell addresses so we don't abort later
 169      * in libdvdread. */
 170     for ( i = 0; i < vts->vts_c_adt->nr_of_vobs; ++i)
 171     {
 172         if( (vts->vts_c_adt->cell_adr_table[i].start_sector & 0xffffff ) ==
 173             0xffffff )
 174         {
 175             hb_error( "scan: cell_adr_table[%d].start_sector invalid (0x%x) "
 176                       "- skipping title", i,
 177                       vts->vts_c_adt->cell_adr_table[i].start_sector );
 178             goto fail;
 179         }
 180         if( (vts->vts_c_adt->cell_adr_table[i].last_sector & 0xffffff ) ==
 181             0xffffff )
 182         {
 183             hb_error( "scan: cell_adr_table[%d].last_sector invalid (0x%x) "
 184                       "- skipping title", i,
 185                       vts->vts_c_adt->cell_adr_table[i].last_sector );
 186             goto fail;
 187         }
 188         if( vts->vts_c_adt->cell_adr_table[i].start_sector >=
 189             vts->vts_c_adt->cell_adr_table[i].last_sector )
 190         {
 191             hb_error( "scan: cell_adr_table[%d].start_sector (0x%x) "
 192                       "is not before last_sector (0x%x) - skipping title", i,
 193                       vts->vts_c_adt->cell_adr_table[i].start_sector,
 194                       vts->vts_c_adt->cell_adr_table[i].last_sector );
 195             goto fail;
 196         }
 197     }
 198
 199     if( global_verbosity_level == 3 )
 200     {
 201         ifoPrint( d->reader, title->vts );
 202     }
 203
 204     /* Position of the title in the VTS */
 205     title->ttn = d->vmg->tt_srpt->title[t-1].vts_ttn;
 206
 207     /* Get pgc */
 208     pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgcn;
 209     pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgn;
 210     d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 211
 212     hb_log("pgc_id: %d, pgn: %d: pgc: 0x%x", pgc_id, pgn, d->pgc);
 213
 214     if( !d->pgc )
 215     {
 216         hb_error( "scan: pgc not valid, skipping" );
 217         goto fail;
 218     }
 219
 220     if( pgn <= 0 || pgn > 99 )
 221     {
 222         hb_error( "scan: pgn %d not valid, skipping", pgn );
 223         goto fail;
 224     }
 225
 226     /* Start cell */
 227     title->cell_start  = d->pgc->program_map[pgn-1] - 1;
 228     title->block_start = d->pgc->cell_playback[title->cell_start].first_sector;
 229
 230     /* End cell */
 231     title->cell_end  = d->pgc->nr_of_cells - 1;
 232     title->block_end = d->pgc->cell_playback[title->cell_end].last_sector;
 233
 234     /* Block count */
 235     title->block_count = 0;
 236     d->cell_cur = title->cell_start;
 237     while( d->cell_cur <= title->cell_end )
 238     {
 239 #define cp d->pgc->cell_playback[d->cell_cur]
 240         title->block_count += cp.last_sector + 1 - cp.first_sector;
 241 #undef cp
 242         FindNextCell( d );
 243         d->cell_cur = d->cell_next;
 244     }
 245
 246     hb_log( "scan: vts=%d, ttn=%d, cells=%d->%d, blocks=%d->%d, "
 247             "%d blocks", title->vts, title->ttn, title->cell_start,
 248             title->cell_end, title->block_start, title->block_end,
 249             title->block_count );
 250
 251     /* Get duration */
 252     title->duration = 90LL * dvdtime2msec( &d->pgc->playback_time );
 253     title->hours    = title->duration / 90000 / 3600;
 254     title->minutes  = ( ( title->duration / 90000 ) % 3600 ) / 60;
 255     title->seconds  = ( title->duration / 90000 ) % 60;
 256     hb_log( "scan: duration is %02d:%02d:%02d (%lld ms)",
 257             title->hours, title->minutes, title->seconds,
 258             title->duration / 90 );
 259
 260     /* ignore titles under 10 seconds because they're often stills or
 261      * clips with no audio & our preview code doesn't currently handle
 262      * either of these. */
 263     if( title->duration < 900000LL )
 264     {
 265         hb_log( "scan: ignoring title (too short)" );
 266         goto fail;
 267     }
 268
 269     /* Detect languages */
 270     for( i = 0; i < vts->vtsi_mat->nr_of_vts_audio_streams; i++ )
 271     {
 272         hb_audio_t * audio, * audio_tmp;
 273         int          audio_format, lang_code, audio_control,
 274                      position, j;
 275         iso639_lang_t * lang;
 276         int lang_extension = 0;
 277
 278         hb_log( "scan: checking audio %d", i + 1 );
 279
 280         audio = calloc( sizeof( hb_audio_t ), 1 );
 281
 282         audio_format  = vts->vtsi_mat->vts_audio_attr[i].audio_format;
 283         lang_code     = vts->vtsi_mat->vts_audio_attr[i].lang_code;
 284         lang_extension = vts->vtsi_mat->vts_audio_attr[i].code_extension;
 285         audio_control =
 286             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->audio_control[i];
 287
 288         if( !( audio_control & 0x8000 ) )
 289         {
 290             hb_log( "scan: audio channel is not active" );
 291             free( audio );
 292             continue;
 293         }
 294
 295         position = ( audio_control & 0x7F00 ) >> 8;
 296
 297         switch( audio_format )
 298         {
 299             case 0x00:
 300                 audio->id    = ( ( 0x80 + position ) << 8 ) | 0xbd;
 301                 audio->config.in.codec = HB_ACODEC_AC3;
 302                 break;
 303
 304             case 0x02:
 305             case 0x03:
 306                 audio->id    = 0xc0 + position;
 307                 audio->config.in.codec = HB_ACODEC_MPGA;
 308                 break;
 309
 310             case 0x04:
 311                 audio->id    = ( ( 0xa0 + position ) << 8 ) | 0xbd;
 312                 audio->config.in.codec = HB_ACODEC_LPCM;
 313                 break;
 314
 315             case 0x06:
 316                 audio->id    = ( ( 0x88 + position ) << 8 ) | 0xbd;
 317                 audio->config.in.codec = HB_ACODEC_DCA;
 318                 break;
 319
 320             default:
 321                 audio->id    = 0;
 322                 audio->config.in.codec = 0;
 323                 hb_log( "scan: unknown audio codec (%x)",
 324                         audio_format );
 325                 break;
 326         }
 327         if( !audio->id )
 328         {
 329             continue;
 330         }
 331
 332         /* Check for duplicate tracks */
 333         audio_tmp = NULL;
 334         for( j = 0; j < hb_list_count( title->list_audio ); j++ )
 335         {
 336             audio_tmp = hb_list_item( title->list_audio, j );
 337             if( audio->id == audio_tmp->id )
 338             {
 339                 break;
 340             }
 341             audio_tmp = NULL;
 342         }
 343         if( audio_tmp )
 344         {
 345             hb_log( "scan: duplicate audio track" );
 346             free( audio );
 347             continue;
 348         }
 349
 350         audio->config.lang.type = lang_extension;
 351
 352         lang = lang_for_code( vts->vtsi_mat->vts_audio_attr[i].lang_code );
 353
 354         snprintf( audio->config.lang.description, sizeof( audio->config.lang.description ), "%s (%s)",
 355             strlen(lang->native_name) ? lang->native_name : lang->eng_name,
 356             audio->config.in.codec == HB_ACODEC_AC3 ? "AC3" : ( audio->config.in.codec ==
 357                 HB_ACODEC_DCA ? "DTS" : ( audio->config.in.codec ==
 358                 HB_ACODEC_MPGA ? "MPEG" : "LPCM" ) ) );
 359         snprintf( audio->config.lang.simple, sizeof( audio->config.lang.simple ), "%s",
 360                   strlen(lang->native_name) ? lang->native_name : lang->eng_name );
 361         snprintf( audio->config.lang.iso639_2, sizeof( audio->config.lang.iso639_2 ), "%s",
 362                   lang->iso639_2);
 363
 364         switch( lang_extension )
 365         {
 366         case 0:
 367         case 1:
 368             break;
 369         case 2:
 370             strcat( audio->config.lang.description, " (Visually Impaired)" );
 371             break;
 372         case 3:
 373             strcat( audio->config.lang.description, " (Director's Commentary 1)" );
 374             break;
 375         case 4:
 376             strcat( audio->config.lang.description, " (Director's Commentary 2)" );
 377             break;
 378         default:
 379             break;
 380         }
 381
 382         hb_log( "scan: id=%x, lang=%s, 3cc=%s ext=%i", audio->id,
 383                 audio->config.lang.description, audio->config.lang.iso639_2,
 384                 lang_extension );
 385
 386         audio->config.in.track = i;
 387         hb_list_add( title->list_audio, audio );
 388     }
 389
 390     if( !hb_list_count( title->list_audio ) )
 391     {
 392         hb_log( "scan: ignoring title (no audio track)" );
 393         goto fail;
 394     }
 395
 396     memcpy( title->palette,
 397             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->palette,
 398             16 * sizeof( uint32_t ) );
 399
 400     /* Check for subtitles */
 401     for( i = 0; i < vts->vtsi_mat->nr_of_vts_subp_streams; i++ )
 402     {
 403         hb_subtitle_t * subtitle;
 404         int spu_control;
 405         int position;
 406         iso639_lang_t * lang;
 407         int lang_extension = 0;
 408
 409         hb_log( "scan: checking subtitle %d", i + 1 );
 410
 411         spu_control =
 412             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->subp_control[i];
 413
 414         if( !( spu_control & 0x80000000 ) )
 415         {
 416             hb_log( "scan: subtitle channel is not active" );
 417             continue;
 418         }
 419
 420         if( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 421         {
 422             switch( vts->vtsi_mat->vts_video_attr.permitted_df )
 423             {
 424                 case 1:
 425                     position = spu_control & 0xFF;
 426                     break;
 427                 case 2:
 428                     position = ( spu_control >> 8 ) & 0xFF;
 429                     break;
 430                 default:
 431                     position = ( spu_control >> 16 ) & 0xFF;
 432             }
 433         }
 434         else
 435         {
 436             position = ( spu_control >> 24 ) & 0x7F;
 437         }
 438
 439         lang_extension = vts->vtsi_mat->vts_subp_attr[i].code_extension;
 440
 441         lang = lang_for_code( vts->vtsi_mat->vts_subp_attr[i].lang_code );
 442
 443         subtitle = calloc( sizeof( hb_subtitle_t ), 1 );
 444         subtitle->id = ( ( 0x20 + position ) << 8 ) | 0xbd;
 445         snprintf( subtitle->lang, sizeof( subtitle->lang ), "%s",
 446              strlen(lang->native_name) ? lang->native_name : lang->eng_name);
 447         snprintf( subtitle->iso639_2, sizeof( subtitle->iso639_2 ), "%s",
 448                   lang->iso639_2);
 449
 450         subtitle->type = lang_extension;
 451
 452         switch( lang_extension )
 453         {
 454         case 0:
 455             break;
 456         case 1:
 457             break;
 458         case 2:
 459             strcat( subtitle->lang, " (Caption with bigger size character)");
 460             break;
 461         case 3:
 462             strcat( subtitle->lang, " (Caption for Children)");
 463             break;
 464         case 4:
 465             break;
 466         case 5:
 467             strcat( subtitle->lang, " (Closed Caption)");
 468             break;
 469         case 6:
 470             strcat( subtitle->lang, " (Closed Caption with bigger size character)");
 471             break;
 472         case 7:
 473             strcat( subtitle->lang, " (Closed Caption for Children)");
 474             break;
 475         case 8:
 476             break;
 477         case 9:
 478             strcat( subtitle->lang, " (Forced Caption)");
 479             break;
 480         case 10:
 481             break;
 482         case 11:
 483             break;
 484         case 12:
 485             break;
 486         case 13:
 487             strcat( subtitle->lang, " (Director's Commentary)");
 488             break;
 489         case 14:
 490             strcat( subtitle->lang, " (Director's Commentary with bigger size character)");
 491             break;
 492         case 15:
 493             strcat( subtitle->lang, " (Director's Commentary for Children)");
 494         default:
 495             break;
 496         }
 497
 498         hb_log( "scan: id=%x, lang=%s, 3cc=%s", subtitle->id,
 499                 subtitle->lang, subtitle->iso639_2 );
 500
 501         hb_list_add( title->list_subtitle, subtitle );
 502     }
 503
 504     /* Chapters */
 505     hb_log( "scan: title %d has %d chapters", t,
 506             vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts );
 507     for( i = 0, c = 1;
 508          i < vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts; i++ )
 509     {
 510         int pgc_id_next, pgn_next;
 511         pgc_t * pgc_next;
 512
 513         chapter = calloc( sizeof( hb_chapter_t ), 1 );
 514         /* remember the on-disc chapter number */
 515         chapter->index = i + 1;
 516
 517         pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgcn;
 518         pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgn;
 519         d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 520
 521         /* Start cell */
 522         chapter->cell_start  = d->pgc->program_map[pgn-1] - 1;
 523         chapter->block_start =
 524             d->pgc->cell_playback[chapter->cell_start].first_sector;
 525
 526         /* End cell */
 527         if( i != vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts - 1 )
 528         {
 529             /* The cell before the starting cell of the next chapter,
 530                or... */
 531             pgc_id_next = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i+1].pgcn;
 532             pgn_next    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i+1].pgn;
 533             pgc_next    = vts->vts_pgcit->pgci_srp[pgc_id_next-1].pgc;
 534             chapter->cell_end = pgc_next->program_map[pgn_next-1] - 2;
 535             if( chapter->cell_end < 0 )
 536             {
 537                 /* Huh? */
 538                 free( chapter );
 539                 continue;
 540             }
 541         }
 542         else
 543         {
 544             /* ... the last cell of the title */
 545             chapter->cell_end = title->cell_end;
 546         }
 547         chapter->block_end =
 548             d->pgc->cell_playback[chapter->cell_end].last_sector;
 549
 550         /* Block count, duration */
 551         pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgcn;
 552         pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgn;
 553         d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 554         chapter->block_count = 0;
 555         chapter->duration = 0;
 556
 557         d->cell_cur = chapter->cell_start;
 558         while( d->cell_cur <= chapter->cell_end )
 559         {
 560 #define cp d->pgc->cell_playback[d->cell_cur]
 561             chapter->block_count += cp.last_sector + 1 - cp.first_sector;
 562             chapter->duration += 90LL * dvdtime2msec( &cp.playback_time );
 563 #undef cp
 564             FindNextCell( d );
 565             d->cell_cur = d->cell_next;
 566         }
 567         hb_list_add( title->list_chapter, chapter );
 568         c++;
 569     }
 570
 571     /* The durations we get for chapters aren't precise. Scale them so
 572        the total matches the title duration */
 573     duration = 0;
 574     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 575     {
 576         chapter = hb_list_item( title->list_chapter, i );
 577         duration += chapter->duration;
 578     }
 579     duration_correction = (float) title->duration / (float) duration;
 580     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 581     {
 582         int seconds;
 583         chapter            = hb_list_item( title->list_chapter, i );
 584         chapter->duration  = duration_correction * chapter->duration;
 585         seconds            = ( chapter->duration + 45000 ) / 90000;
 586         chapter->hours     = seconds / 3600;
 587         chapter->minutes   = ( seconds % 3600 ) / 60;
 588         chapter->seconds   = seconds % 60;
 589
 590         hb_log( "scan: chap %d c=%d->%d, b=%d->%d (%d), %lld ms",
 591                 chapter->index, chapter->cell_start, chapter->cell_end,
 592                 chapter->block_start, chapter->block_end,
 593                 chapter->block_count, chapter->duration / 90 );
 594     }
 595
 596     /* Get aspect. We don't get width/height/rate infos here as
 597        they tend to be wrong */
 598     switch( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 599     {
 600         case 0:
 601             title->container_aspect = 4. / 3.;
 602             break;
 603         case 3:
 604             title->container_aspect = 16. / 9.;
 605             break;
 606         default:
 607             hb_log( "scan: unknown aspect" );
 608             goto fail;
 609     }
 610
 611     hb_log( "scan: aspect = %g", title->aspect );
 612
 613     /* This title is ok so far */
 614     goto cleanup;
 615
 616 fail:
 617     hb_list_close( &title->list_audio );
 618     free( title );
 619     title = NULL;
 620
 621 cleanup:
 622     if( vts ) ifoClose( vts );
 623
 624     return title;
 625 }
 626
 627 /***********************************************************************
 628  * hb_dvd_start
 629  ***********************************************************************
 630  * Title and chapter start at 1
 631  **********************************************************************/
 632 int hb_dvd_start( hb_dvd_t * d, int title, int chapter )
 633 {
 634     int pgc_id, pgn;
 635     int i;
 636
 637     /* Open the IFO and the VOBs for this title */
 638     d->vts = d->vmg->tt_srpt->title[title-1].title_set_nr;
 639     d->ttn = d->vmg->tt_srpt->title[title-1].vts_ttn;
 640     if( !( d->ifo = ifoOpen( d->reader, d->vts ) ) )
 641     {
 642         hb_error( "dvd: ifoOpen failed for VTS %d", d->vts );
 643         return 0;
 644     }
 645     if( !( d->file = DVDOpenFile( d->reader, d->vts,
 646                                   DVD_READ_TITLE_VOBS ) ) )
 647     {
 648         hb_error( "dvd: DVDOpenFile failed for VTS %d", d->vts );
 649         return 0;
 650     }
 651
 652     /* Get title first and last blocks */
 653     pgc_id         = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgcn;
 654     pgn            = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgn;
 655     d->pgc         = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 656     d->cell_start  = d->pgc->program_map[pgn - 1] - 1;
 657     d->cell_end    = d->pgc->nr_of_cells - 1;
 658     d->title_start = d->pgc->cell_playback[d->cell_start].first_sector;
 659     d->title_end   = d->pgc->cell_playback[d->cell_end].last_sector;
 660
 661     /* Block count */
 662     d->title_block_count = 0;
 663     for( i = d->cell_start; i <= d->cell_end; i++ )
 664     {
 665         d->title_block_count += d->pgc->cell_playback[i].last_sector + 1 -
 666             d->pgc->cell_playback[i].first_sector;
 667     }
 668
 669     /* Get pgc for the current chapter */
 670     pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgcn;
 671     pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgn;
 672     d->pgc = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 673
 674     /* Get the two first cells */
 675     d->cell_cur = d->pgc->program_map[pgn-1] - 1;
 676     FindNextCell( d );
 677
 678     d->block     = d->pgc->cell_playback[d->cell_cur].first_sector;
 679     d->next_vobu = d->block;
 680     d->pack_len  = 0;
 681     d->cell_overlap = 0;
 682     d->in_cell = 0;
 683     d->in_sync = 2;
 684
 685     return 1;
 686 }
 687
 688 /***********************************************************************
 689  * hb_dvd_stop
 690  ***********************************************************************
 691  *
 692  **********************************************************************/
 693 void hb_dvd_stop( hb_dvd_t * d )
 694 {
 695     if( d->ifo )
 696     {
 697         ifoClose( d->ifo );
 698         d->ifo = NULL;
 699     }
 700     if( d->file )
 701     {
 702         DVDCloseFile( d->file );
 703         d->file = NULL;
 704     }
 705 }
 706
 707 /***********************************************************************
 708  * hb_dvd_seek
 709  ***********************************************************************
 710  *
 711  **********************************************************************/
 712 int hb_dvd_seek( hb_dvd_t * d, float f )
 713 {
 714     int count, sizeCell;
 715     int i;
 716
 717     count = f * d->title_block_count;
 718
 719     for( i = d->cell_start; i <= d->cell_end; i++ )
 720     {
 721         sizeCell = d->pgc->cell_playback[i].last_sector + 1 -
 722             d->pgc->cell_playback[i].first_sector;
 723
 724         if( count < sizeCell )
 725         {
 726             d->cell_cur = i;
 727             d->cur_cell_id = 0;
 728             FindNextCell( d );
 729
 730             /* Now let hb_dvd_read find the next VOBU */
 731             d->next_vobu = d->pgc->cell_playback[i].first_sector + count;
 732             d->pack_len  = 0;
 733             break;
 734         }
 735
 736         count -= sizeCell;
 737     }
 738
 739     if( i > d->cell_end )
 740     {
 741         return 0;
 742     }
 743
 744     /*
 745      * Assume that we are in sync, even if we are not given that it is obvious
 746      * that we are out of sync if we have just done a seek.
 747      */
 748     d->in_sync = 2;
 749
 750     return 1;
 751 }
 752
 753
 754 /***********************************************************************
 755  * is_nav_pack
 756  ***********************************************************************/
 757 int is_nav_pack( unsigned char *buf )
 758 {
 759     /*
 760      * The NAV Pack is comprised of the PCI Packet and DSI Packet, both
 761      * of these start at known offsets and start with a special identifier.
 762      *
 763      * NAV = {
 764      *  PCI = { 00 00 01 bf  # private stream header
 765      *          ?? ??        # length
 766      *          00           # substream
 767      *          ...
 768      *        }
 769      *  DSI = { 00 00 01 bf  # private stream header
 770      *          ?? ??        # length
 771      *          01           # substream
 772      *          ...
 773      *        }
 774      *
 775      * The PCI starts at offset 0x26 into the sector, and the DSI starts at 0x400
 776      *
 777      * This information from: http://dvd.sourceforge.net/dvdinfo/
 778      */
 779     if( ( buf[0x26] == 0x00 &&      // PCI
 780           buf[0x27] == 0x00 &&
 781           buf[0x28] == 0x01 &&
 782           buf[0x29] == 0xbf &&
 783           buf[0x2c] == 0x00 ) &&
 784         ( buf[0x400] == 0x00 &&     // DSI
 785           buf[0x401] == 0x00 &&
 786           buf[0x402] == 0x01 &&
 787           buf[0x403] == 0xbf &&
 788           buf[0x406] == 0x01 ) )
 789     {
 790         return ( 1 );
 791     } else {
 792         return ( 0 );
 793     }
 794 }
 795
 796
 797 /***********************************************************************
 798  * hb_dvd_read
 799  ***********************************************************************
 800  *
 801  **********************************************************************/
 802 int hb_dvd_read( hb_dvd_t * d, hb_buffer_t * b )
 803 {
 804  top:
 805     if( !d->pack_len )
 806     {
 807         /* New pack */
 808         dsi_t dsi_pack;
 809         int   error = 0;
 810
 811         // if we've just finished the last cell of the title we don't
 812         // want to read another block because our next_vobu pointer
 813         // is probably invalid. Just return 'no data' & our caller
 814         // should check and discover we're at eof.
 815         if ( d->cell_cur > d->cell_end )
 816             return 0;
 817
 818         for( ;; )
 819         {
 820             int block, pack_len, next_vobu, read_retry;
 821
 822             for( read_retry = 0; read_retry < 3; read_retry++ )
 823             {
 824                 if( DVDReadBlocks( d->file, d->next_vobu, 1, b->data ) == 1 )
 825                 {
 826                     /*
 827                      * Successful read.
 828                      */
 829                     break;
 830                 } else {
 831                     hb_log( "dvd: Read Error on blk %d, attempt %d",
 832                             d->next_vobu, read_retry );
 833                 }
 834             }
 835
 836             if( read_retry == 3 )
 837             {
 838                 hb_log( "dvd: vobu read error blk %d - skipping to cell %d",
 839                         d->next_vobu, d->cell_next );
 840                 d->cell_cur  = d->cell_next;
 841                 if ( d->cell_cur > d->cell_end )
 842                     return 0;
 843                 d->in_cell = 0;
 844                 d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
 845                 FindNextCell( d );
 846                 d->cell_overlap = 1;
 847                 continue;
 848             }
 849
 850             if ( !is_nav_pack( b->data ) ) {
 851                 (d->next_vobu)++;
 852                 if( d->in_sync == 1 ) {
 853                     hb_log("dvd: Lost sync, searching for NAV pack at blk %d",
 854                            d->next_vobu);
 855                     d->in_sync = 0;
 856                 }
 857                 continue;
 858             }
 859
 860             navRead_DSI( &dsi_pack, &b->data[DSI_START_BYTE] );
 861
 862             if ( d->in_sync == 0 && d->cur_cell_id &&
 863                  (d->cur_vob_id != dsi_pack.dsi_gi.vobu_vob_idn ||
 864                   d->cur_cell_id != dsi_pack.dsi_gi.vobu_c_idn ) )
 865             {
 866                 // We walked out of the cell we're supposed to be in.
 867                 // If we're not at the start of our next cell go there.
 868                 hb_log("dvd: left cell %d (%u,%u) for (%u,%u) at block %u",
 869                        d->cell_cur, d->cur_vob_id, d->cur_cell_id,
 870                        dsi_pack.dsi_gi.vobu_vob_idn, dsi_pack.dsi_gi.vobu_c_idn,
 871                        d->next_vobu );
 872                 if ( d->next_vobu != d->pgc->cell_playback[d->cell_next].first_sector )
 873                 {
 874                     d->next_vobu = d->pgc->cell_playback[d->cell_next].first_sector;
 875                     d->cur_cell_id = 0;
 876                     continue;
 877                 }
 878             }
 879
 880             block     = dsi_pack.dsi_gi.nv_pck_lbn;
 881             pack_len  = dsi_pack.dsi_gi.vobu_ea;
 882
 883             // There are a total of 21 next vobu offsets (and 21 prev_vobu
 884             // offsets) in the navpack SRI structure. The primary one is
 885             // 'next_vobu' which is the offset (in dvd blocks) from the current
 886             // block to the start of the next vobu. If the block at 'next_vobu'
 887             // can't be read, 'next_video' is the offset to the vobu closest to it.
 888             // The other 19 offsets are vobus at successively longer distances from
 889             // the current block (this is so that a hardware player can do
 890             // adaptive error recovery to skip over a bad spot on the disk). In all
 891             // these offsets the high bit is set to indicate when it contains a
 892             // valid offset. The next bit (2^30) is set to indicate that there's
 893             // another valid offset in the SRI that's closer to the current block.
 894             // A hardware player uses these bits to chose the closest valid offset
 895             // and uses that as its next vobu. (Some mastering schemes appear to
 896             // put a bogus offset in next_vobu with the 2^30 bit set & the
 897             // correct offset in next_video. This works fine in hardware players
 898             // but will mess up software that doesn't implement the full next
 899             // vobu decision logic.) In addition to the flag bits there's a
 900             // reserved value of the offset that indicates 'no next vobu' (which
 901             // indicates the end of a cell). But having no next vobu pointer with a
 902             // 'valid' bit set also indicates end of cell. Different mastering
 903             // schemes seem to use all possible combinations of the flag bits
 904             // and reserved values to indicate end of cell so we have to check
 905             // them all or we'll get a disk read error from following an
 906             // invalid offset.
 907             uint32_t next_ptr = dsi_pack.vobu_sri.next_vobu;
 908             if ( ( next_ptr & ( 1 << 31 ) ) == 0  ||
 909                  ( next_ptr & ( 1 << 30 ) ) != 0 ||
 910                  ( next_ptr & 0x3fffffff ) == 0x3fffffff )
 911             {
 912                 next_ptr = dsi_pack.vobu_sri.next_video;
 913                 if ( ( next_ptr & ( 1 << 31 ) ) == 0 ||
 914                      ( next_ptr & 0x3fffffff ) == 0x3fffffff )
 915                 {
 916                     // don't have a valid forward pointer - assume end-of-cell
 917                     d->block     = block;
 918                     d->pack_len  = pack_len;
 919                     break;
 920                 }
 921             }
 922             next_vobu = block + ( next_ptr & 0x3fffffff );
 923
 924             if( pack_len >  0    &&
 925                 pack_len <  1024 &&
 926                 block    >= d->next_vobu &&
 927                 ( block <= d->title_start + d->title_block_count ||
 928                   block <= d->title_end ) )
 929             {
 930                 d->block     = block;
 931                 d->pack_len  = pack_len;
 932                 d->next_vobu = next_vobu;
 933                 break;
 934             }
 935
 936             /* Wasn't a valid VOBU, try next block */
 937             if( ++error > 1024 )
 938             {
 939                 hb_log( "dvd: couldn't find a VOBU after 1024 blocks" );
 940                 return 0;
 941             }
 942
 943             (d->next_vobu)++;
 944         }
 945
 946         if( d->in_sync == 0 || d->in_sync == 2 )
 947         {
 948             if( d->in_sync == 0 )
 949             {
 950                 hb_log( "dvd: In sync with DVD at block %d", d->block );
 951             }
 952             d->in_sync = 1;
 953         }
 954
 955         // Revert the cell overlap, and check for a chapter break
 956         // If this cell is zero length (prev_vobu & next_vobu both
 957         // set to END_OF_CELL) we need to check for beginning of
 958         // cell before checking for end or we'll advance to the next
 959         // cell too early and fail to generate a chapter mark when this
 960         // cell starts a chapter.
 961         if( ( dsi_pack.vobu_sri.prev_vobu & (1 << 31 ) ) == 0 ||
 962             ( dsi_pack.vobu_sri.prev_vobu & 0x3fffffff ) == 0x3fffffff )
 963         {
 964             // A vobu that's not at the start of a cell can have an
 965             // EOC prev pointer (this seems to be associated with some
 966             // sort of drm). The rest of the content in the cell may be
 967             // booby-trapped so treat this like an end-of-cell rather
 968             // than a beginning of cell.
 969             if ( d->pgc->cell_playback[d->cell_cur].first_sector < dsi_pack.dsi_gi.nv_pck_lbn &&
 970                  d->pgc->cell_playback[d->cell_cur].last_sector >= dsi_pack.dsi_gi.nv_pck_lbn )
 971             {
 972                 hb_log( "dvd: null prev_vobu in cell %d at block %d", d->cell_cur,
 973                         d->block );
 974                 // treat like end-of-cell then go directly to start of next cell.
 975                 d->cell_cur  = d->cell_next;
 976                 d->in_cell = 0;
 977                 d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
 978                 FindNextCell( d );
 979                 d->cell_overlap = 1;
 980                 goto top;
 981             }
 982             else
 983             {
 984                 if ( d->block != d->pgc->cell_playback[d->cell_cur].first_sector )
 985                 {
 986                     hb_log( "dvd: beginning of cell %d at block %d", d->cell_cur,
 987                            d->block );
 988                 }
 989                 if( d->in_cell )
 990                 {
 991                     hb_error( "dvd: assuming missed end of cell %d", d->cell_cur );
 992                     d->cell_cur  = d->cell_next;
 993                     d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
 994                     FindNextCell( d );
 995                     d->cell_overlap = 1;
 996                     d->in_cell = 0;
 997                 } else {
 998                     d->in_cell = 1;
 999                 }
1000                 d->cur_vob_id = dsi_pack.dsi_gi.vobu_vob_idn;
1001                 d->cur_cell_id = dsi_pack.dsi_gi.vobu_c_idn;
1002
1003                 if( d->cell_overlap )
1004                 {
1005                     b->new_chap = hb_dvd_is_break( d );
1006                     d->cell_overlap = 0;
1007                 }
1008             }
1009         }
1010
1011         if( ( dsi_pack.vobu_sri.next_vobu & (1 << 31 ) ) == 0 ||
1012             ( dsi_pack.vobu_sri.next_vobu & 0x3fffffff ) == 0x3fffffff )
1013         {
1014             if ( d->block <= d->pgc->cell_playback[d->cell_cur].first_sector ||
1015                  d->block > d->pgc->cell_playback[d->cell_cur].last_sector )
1016             {
1017                 hb_log( "dvd: end of cell %d at block %d", d->cell_cur,
1018                         d->block );
1019             }
1020             d->cell_cur  = d->cell_next;
1021             d->in_cell = 0;
1022             d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
1023             FindNextCell( d );
1024             d->cell_overlap = 1;
1025
1026         }
1027     }
1028     else
1029     {
1030         if( DVDReadBlocks( d->file, d->block, 1, b->data ) != 1 )
1031         {
1032             // this may be a real DVD error or may be DRM. Either way
1033             // we don't want to quit because of one bad block so set
1034             // things up so we'll advance to the next vobu and recurse.
1035             hb_error( "dvd: DVDReadBlocks failed (%d), skipping to vobu %u",
1036                       d->block, d->next_vobu );
1037             d->pack_len = 0;
1038             goto top;  /* XXX need to restructure this routine & avoid goto */
1039         }
1040         d->pack_len--;
1041     }
1042
1043     d->block++;
1044
1045     return 1;
1046 }
1047
1048 /***********************************************************************
1049  * hb_dvd_chapter
1050  ***********************************************************************
1051  * Returns in which chapter the next block to be read is.
1052  * Chapter numbers start at 1.
1053  **********************************************************************/
1054 int hb_dvd_chapter( hb_dvd_t * d )
1055 {
1056     int     i;
1057     int     pgc_id, pgn;
1058     int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
1059     pgc_t * pgc;
1060
1061     for( i = nr_of_ptts - 1;
1062          i >= 0;
1063          i-- )
1064     {
1065         /* Get pgc for chapter (i+1) */
1066         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
1067         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
1068         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
1069
1070         if( d->cell_cur - d->cell_overlap >= pgc->program_map[pgn-1] - 1 &&
1071             d->cell_cur - d->cell_overlap <= pgc->nr_of_cells - 1 )
1072         {
1073             /* We are in this chapter */
1074             return i + 1;
1075         }
1076     }
1077
1078     /* End of title */
1079     return -1;
1080 }
1081
1082 /***********************************************************************
1083  * hb_dvd_is_break
1084  ***********************************************************************
1085  * Returns chapter number if the current block is a new chapter start
1086  **********************************************************************/
1087 int hb_dvd_is_break( hb_dvd_t * d )
1088 {
1089     int     i;
1090     int     pgc_id, pgn;
1091         int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
1092     pgc_t * pgc;
1093     int     cell;
1094
1095     for( i = nr_of_ptts - 1;
1096          i > 0;
1097          i-- )
1098     {
1099         /* Get pgc for chapter (i+1) */
1100         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
1101         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
1102         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
1103         cell   = pgc->program_map[pgn-1] - 1;
1104
1105         if( cell <= d->cell_start )
1106             break;
1107
1108         // This must not match against the start cell.
1109         if( pgc->cell_playback[cell].first_sector == d->block && cell != d->cell_start )
1110         {
1111             return i + 1;
1112         }
1113     }
1114
1115     return 0;
1116 }
1117
1118 /***********************************************************************
1119  * hb_dvd_close
1120  ***********************************************************************
1121  * Closes and frees everything
1122  **********************************************************************/
1123 void hb_dvd_close( hb_dvd_t ** _d )
1124 {
1125     hb_dvd_t * d = *_d;
1126
1127     if( d->vmg )
1128     {
1129         ifoClose( d->vmg );
1130     }
1131     if( d->reader )
1132     {
1133         DVDClose( d->reader );
1134     }
1135
1136     free( d );
1137     *_d = NULL;
1138 }
1139
1140 /***********************************************************************
1141  * FindNextCell
1142  ***********************************************************************
1143  * Assumes pgc and cell_cur are correctly set, and sets cell_next to the
1144  * cell to be read when we will be done with cell_cur.
1145  **********************************************************************/
1146 static void FindNextCell( hb_dvd_t * d )
1147 {
1148     int i = 0;
1149
1150     if( d->pgc->cell_playback[d->cell_cur].block_type ==
1151             BLOCK_TYPE_ANGLE_BLOCK )
1152     {
1153
1154         while( d->pgc->cell_playback[d->cell_cur+i].block_mode !=
1155                    BLOCK_MODE_LAST_CELL )
1156         {
1157              i++;
1158         }
1159         d->cell_next = d->cell_cur + i + 1;
1160         hb_log( "dvd: Skipping multi-angle cells %d-%d",
1161                 d->cell_cur,
1162                 d->cell_next - 1 );
1163     }
1164     else
1165     {
1166         d->cell_next = d->cell_cur + 1;
1167     }
1168 }
1169
1170 /***********************************************************************
1171  * dvdtime2msec
1172  ***********************************************************************
1173  * From lsdvd
1174  **********************************************************************/
1175 static int dvdtime2msec(dvd_time_t * dt)
1176 {
1177     double frames_per_s[4] = {-1.0, 25.00, -1.0, 29.97};
1178     double fps = frames_per_s[(dt->frame_u & 0xc0) >> 6];
1179     long   ms;
1180     ms  = (((dt->hour &   0xf0) >> 3) * 5 + (dt->hour   & 0x0f)) * 3600000;
1181     ms += (((dt->minute & 0xf0) >> 3) * 5 + (dt->minute & 0x0f)) * 60000;
1182     ms += (((dt->second & 0xf0) >> 3) * 5 + (dt->second & 0x0f)) * 1000;
1183
1184     if( fps > 0 )
1185     {
1186         ms += ((dt->frame_u & 0x30) >> 3) * 5 +
1187               (dt->frame_u & 0x0f) * 1000.0 / fps;
1188     }
1189
1190     return ms;
1191 }