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 #include "dvd.h"
  10
  11 #include "dvdread/ifo_read.h"
  12 #include "dvdread/ifo_print.h"
  13 #include "dvdread/nav_read.h"
  14
  15 static hb_dvd_t    * hb_dvdread_init( char * path );
  16 static void          hb_dvdread_close( hb_dvd_t ** _d );
  17 static char        * hb_dvdread_name( char * path );
  18 static int           hb_dvdread_title_count( hb_dvd_t * d );
  19 static hb_title_t  * hb_dvdread_title_scan( hb_dvd_t * d, int t );
  20 static int           hb_dvdread_start( hb_dvd_t * d, hb_title_t *title, int chapter );
  21 static void          hb_dvdread_stop( hb_dvd_t * d );
  22 static int           hb_dvdread_seek( hb_dvd_t * d, float f );
  23 static int           hb_dvdread_read( hb_dvd_t * d, hb_buffer_t * b );
  24 static int           hb_dvdread_chapter( hb_dvd_t * d );
  25 static int           hb_dvdread_angle_count( hb_dvd_t * d );
  26 static void          hb_dvdread_set_angle( hb_dvd_t * d, int angle );
  27
  28 hb_dvd_func_t hb_dvdread_func =
  29 {
  30     hb_dvdread_init,
  31     hb_dvdread_close,
  32     hb_dvdread_name,
  33     hb_dvdread_title_count,
  34     hb_dvdread_title_scan,
  35     hb_dvdread_start,
  36     hb_dvdread_stop,
  37     hb_dvdread_seek,
  38     hb_dvdread_read,
  39     hb_dvdread_chapter,
  40     hb_dvdread_angle_count,
  41     hb_dvdread_set_angle
  42 };
  43
  44 static hb_dvd_func_t *dvd_methods = &hb_dvdread_func;
  45
  46 /***********************************************************************
  47  * Local prototypes
  48  **********************************************************************/
  49 static void FindNextCell( hb_dvdread_t * );
  50 static int  dvdtime2msec( dvd_time_t * );
  51 static int hb_dvdread_is_break( hb_dvdread_t * d );
  52
  53 hb_dvd_func_t * hb_dvdread_methods( void )
  54 {
  55     return &hb_dvdread_func;
  56 }
  57
  58 static char * hb_dvdread_name( char * path )
  59 {
  60     static char name[1024];
  61     unsigned char unused[1024];
  62     dvd_reader_t * reader;
  63
  64     reader = DVDOpen( path );
  65     if( !reader )
  66     {
  67         return NULL;
  68     }
  69
  70     if( DVDUDFVolumeInfo( reader, name, sizeof( name ),
  71                           unused, sizeof( unused ) ) )
  72     {
  73         DVDClose( reader );
  74         return NULL;
  75     }
  76
  77     DVDClose( reader );
  78     return name;
  79 }
  80
  81 /***********************************************************************
  82  * hb_dvdread_init
  83  ***********************************************************************
  84  *
  85  **********************************************************************/
  86 hb_dvd_t * hb_dvdread_init( char * path )
  87 {
  88     hb_dvd_t * e;
  89     hb_dvdread_t * d;
  90     int region_mask;
  91
  92     e = calloc( sizeof( hb_dvd_t ), 1 );
  93     d = &(e->dvdread);
  94
  95         /* Log DVD drive region code */
  96     if ( hb_dvd_region( path, &region_mask ) == 0 )
  97     {
  98         hb_log( "dvd: Region mask 0x%02x", region_mask );
  99         if ( region_mask == 0xFF )
 100         {
 101             hb_log( "dvd: Warning, DVD device has no region set" );
 102         }
 103     }
 104
 105     /* Open device */
 106     if( !( d->reader = DVDOpen( path ) ) )
 107     {
 108         /*
 109          * Not an error, may be a stream - which we'll try in a moment.
 110          */
 111         hb_log( "dvd: not a dvd - trying as a stream/file instead" );
 112         goto fail;
 113     }
 114
 115     /* Open main IFO */
 116     if( !( d->vmg = ifoOpen( d->reader, 0 ) ) )
 117     {
 118         hb_error( "dvd: ifoOpen failed" );
 119         goto fail;
 120     }
 121
 122     d->path = strdup( path );
 123
 124     return e;
 125
 126 fail:
 127     if( d->vmg )    ifoClose( d->vmg );
 128     if( d->reader ) DVDClose( d->reader );
 129     free( d );
 130     return NULL;
 131 }
 132
 133 /***********************************************************************
 134  * hb_dvdread_title_count
 135  **********************************************************************/
 136 static int hb_dvdread_title_count( hb_dvd_t * e )
 137 {
 138     hb_dvdread_t *d = &(e->dvdread);
 139     return d->vmg->tt_srpt->nr_of_srpts;
 140 }
 141
 142 /***********************************************************************
 143  * hb_dvdread_title_scan
 144  **********************************************************************/
 145 static hb_title_t * hb_dvdread_title_scan( hb_dvd_t * e, int t )
 146 {
 147
 148     hb_dvdread_t *d = &(e->dvdread);
 149     hb_title_t   * title;
 150     ifo_handle_t * vts = NULL;
 151     int            pgc_id, pgn, i;
 152     hb_chapter_t * chapter;
 153     int            c;
 154     uint64_t       duration;
 155     float          duration_correction;
 156     unsigned char  unused[1024];
 157
 158     hb_log( "scan: scanning title %d", t );
 159
 160     title = hb_title_init( d->path, t );
 161     if( DVDUDFVolumeInfo( d->reader, title->name, sizeof( title->name ),
 162                           unused, sizeof( unused ) ) )
 163     {
 164         char * p_cur, * p_last = d->path;
 165         for( p_cur = d->path; *p_cur; p_cur++ )
 166         {
 167             if( p_cur[0] == '/' && p_cur[1] )
 168             {
 169                 p_last = &p_cur[1];
 170             }
 171         }
 172         snprintf( title->name, sizeof( title->name ), "%s", p_last );
 173     }
 174
 175     /* VTS which our title is in */
 176     title->vts = d->vmg->tt_srpt->title[t-1].title_set_nr;
 177
 178     if ( !title->vts )
 179     {
 180         /* A VTS of 0 means the title wasn't found in the title set */
 181         hb_error("Invalid VTS (title set) number: %i", title->vts);
 182         goto fail;
 183     }
 184
 185     hb_log( "scan: opening IFO for VTS %d", title->vts );
 186     if( !( vts = ifoOpen( d->reader, title->vts ) ) )
 187     {
 188         hb_error( "scan: ifoOpen failed" );
 189         goto fail;
 190     }
 191
 192     /* ignore titles with bogus cell addresses so we don't abort later
 193      * in libdvdread. */
 194     for ( i = 0; i < vts->vts_c_adt->nr_of_vobs; ++i)
 195     {
 196         if( (vts->vts_c_adt->cell_adr_table[i].start_sector & 0xffffff ) ==
 197             0xffffff )
 198         {
 199             hb_error( "scan: cell_adr_table[%d].start_sector invalid (0x%x) "
 200                       "- skipping title", i,
 201                       vts->vts_c_adt->cell_adr_table[i].start_sector );
 202             goto fail;
 203         }
 204         if( (vts->vts_c_adt->cell_adr_table[i].last_sector & 0xffffff ) ==
 205             0xffffff )
 206         {
 207             hb_error( "scan: cell_adr_table[%d].last_sector invalid (0x%x) "
 208                       "- skipping title", i,
 209                       vts->vts_c_adt->cell_adr_table[i].last_sector );
 210             goto fail;
 211         }
 212         if( vts->vts_c_adt->cell_adr_table[i].start_sector >=
 213             vts->vts_c_adt->cell_adr_table[i].last_sector )
 214         {
 215             hb_error( "scan: cell_adr_table[%d].start_sector (0x%x) "
 216                       "is not before last_sector (0x%x) - skipping title", i,
 217                       vts->vts_c_adt->cell_adr_table[i].start_sector,
 218                       vts->vts_c_adt->cell_adr_table[i].last_sector );
 219             goto fail;
 220         }
 221     }
 222
 223     if( global_verbosity_level == 3 )
 224     {
 225         ifo_print( d->reader, title->vts );
 226     }
 227
 228     /* Position of the title in the VTS */
 229     title->ttn = d->vmg->tt_srpt->title[t-1].vts_ttn;
 230     if ( title->ttn < 1 || title->ttn > vts->vts_ptt_srpt->nr_of_srpts )
 231     {
 232         hb_error( "invalid VTS PTT offset %d for title %d, skipping", title->ttn, t );
 233         goto fail;
 234     }
 235
 236     /* Get pgc */
 237     pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgcn;
 238     if ( pgc_id < 1 || pgc_id > vts->vts_pgcit->nr_of_pgci_srp )
 239     {
 240         hb_error( "invalid PGC ID %d for title %d, skipping", pgc_id, t );
 241         goto fail;
 242     }
 243     pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgn;
 244     d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 245
 246     hb_log("pgc_id: %d, pgn: %d: pgc: %p", pgc_id, pgn, d->pgc);
 247
 248     if( !d->pgc )
 249     {
 250         hb_error( "scan: pgc not valid, skipping" );
 251         goto fail;
 252     }
 253
 254     if( pgn <= 0 || pgn > 99 )
 255     {
 256         hb_error( "scan: pgn %d not valid, skipping", pgn );
 257         goto fail;
 258     }
 259
 260     /* Start cell */
 261     title->cell_start  = d->pgc->program_map[pgn-1] - 1;
 262     title->block_start = d->pgc->cell_playback[title->cell_start].first_sector;
 263
 264     /* End cell */
 265     title->cell_end  = d->pgc->nr_of_cells - 1;
 266     title->block_end = d->pgc->cell_playback[title->cell_end].last_sector;
 267
 268     /* Block count */
 269     title->block_count = 0;
 270     d->cell_cur = title->cell_start;
 271     while( d->cell_cur <= title->cell_end )
 272     {
 273 #define cp d->pgc->cell_playback[d->cell_cur]
 274         title->block_count += cp.last_sector + 1 - cp.first_sector;
 275 #undef cp
 276         FindNextCell( d );
 277         d->cell_cur = d->cell_next;
 278     }
 279
 280     hb_log( "scan: vts=%d, ttn=%d, cells=%d->%d, blocks=%d->%d, "
 281             "%d blocks", title->vts, title->ttn, title->cell_start,
 282             title->cell_end, title->block_start, title->block_end,
 283             title->block_count );
 284
 285     /* Get duration */
 286     title->duration = 90LL * dvdtime2msec( &d->pgc->playback_time );
 287     title->hours    = title->duration / 90000 / 3600;
 288     title->minutes  = ( ( title->duration / 90000 ) % 3600 ) / 60;
 289     title->seconds  = ( title->duration / 90000 ) % 60;
 290     hb_log( "scan: duration is %02d:%02d:%02d (%"PRId64" ms)",
 291             title->hours, title->minutes, title->seconds,
 292             title->duration / 90 );
 293
 294     /* ignore titles under 10 seconds because they're often stills or
 295      * clips with no audio & our preview code doesn't currently handle
 296      * either of these. */
 297     if( title->duration < 900000LL )
 298     {
 299         hb_log( "scan: ignoring title (too short)" );
 300         goto fail;
 301     }
 302
 303     /* Detect languages */
 304     for( i = 0; i < vts->vtsi_mat->nr_of_vts_audio_streams; i++ )
 305     {
 306         hb_audio_t * audio, * audio_tmp;
 307         int          audio_format, lang_code, audio_control,
 308                      position, j;
 309         iso639_lang_t * lang;
 310         int lang_extension = 0;
 311
 312         hb_log( "scan: checking audio %d", i + 1 );
 313
 314         audio = calloc( sizeof( hb_audio_t ), 1 );
 315
 316         audio_format  = vts->vtsi_mat->vts_audio_attr[i].audio_format;
 317         lang_code     = vts->vtsi_mat->vts_audio_attr[i].lang_code;
 318         lang_extension = vts->vtsi_mat->vts_audio_attr[i].code_extension;
 319         audio_control =
 320             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->audio_control[i];
 321
 322         if( !( audio_control & 0x8000 ) )
 323         {
 324             hb_log( "scan: audio channel is not active" );
 325             free( audio );
 326             continue;
 327         }
 328
 329         position = ( audio_control & 0x7F00 ) >> 8;
 330
 331         switch( audio_format )
 332         {
 333             case 0x00:
 334                 audio->id    = ( ( 0x80 + position ) << 8 ) | 0xbd;
 335                 audio->config.in.codec = HB_ACODEC_AC3;
 336                 break;
 337
 338             case 0x02:
 339             case 0x03:
 340                 audio->id    = 0xc0 + position;
 341                 audio->config.in.codec = HB_ACODEC_MPGA;
 342                 break;
 343
 344             case 0x04:
 345                 audio->id    = ( ( 0xa0 + position ) << 8 ) | 0xbd;
 346                 audio->config.in.codec = HB_ACODEC_LPCM;
 347                 break;
 348
 349             case 0x06:
 350                 audio->id    = ( ( 0x88 + position ) << 8 ) | 0xbd;
 351                 audio->config.in.codec = HB_ACODEC_DCA;
 352                 break;
 353
 354             default:
 355                 audio->id    = 0;
 356                 audio->config.in.codec = 0;
 357                 hb_log( "scan: unknown audio codec (%x)",
 358                         audio_format );
 359                 break;
 360         }
 361         if( !audio->id )
 362         {
 363             continue;
 364         }
 365
 366         /* Check for duplicate tracks */
 367         audio_tmp = NULL;
 368         for( j = 0; j < hb_list_count( title->list_audio ); j++ )
 369         {
 370             audio_tmp = hb_list_item( title->list_audio, j );
 371             if( audio->id == audio_tmp->id )
 372             {
 373                 break;
 374             }
 375             audio_tmp = NULL;
 376         }
 377         if( audio_tmp )
 378         {
 379             hb_log( "scan: duplicate audio track" );
 380             free( audio );
 381             continue;
 382         }
 383
 384         audio->config.lang.type = lang_extension;
 385
 386         lang = lang_for_code( vts->vtsi_mat->vts_audio_attr[i].lang_code );
 387
 388         snprintf( audio->config.lang.description, sizeof( audio->config.lang.description ), "%s (%s)",
 389             strlen(lang->native_name) ? lang->native_name : lang->eng_name,
 390             audio->config.in.codec == HB_ACODEC_AC3 ? "AC3" : ( audio->config.in.codec ==
 391                 HB_ACODEC_DCA ? "DTS" : ( audio->config.in.codec ==
 392                 HB_ACODEC_MPGA ? "MPEG" : "LPCM" ) ) );
 393         snprintf( audio->config.lang.simple, sizeof( audio->config.lang.simple ), "%s",
 394                   strlen(lang->native_name) ? lang->native_name : lang->eng_name );
 395         snprintf( audio->config.lang.iso639_2, sizeof( audio->config.lang.iso639_2 ), "%s",
 396                   lang->iso639_2);
 397
 398         switch( lang_extension )
 399         {
 400         case 0:
 401         case 1:
 402             break;
 403         case 2:
 404             strcat( audio->config.lang.description, " (Visually Impaired)" );
 405             break;
 406         case 3:
 407             strcat( audio->config.lang.description, " (Director's Commentary 1)" );
 408             break;
 409         case 4:
 410             strcat( audio->config.lang.description, " (Director's Commentary 2)" );
 411             break;
 412         default:
 413             break;
 414         }
 415
 416         hb_log( "scan: id=%x, lang=%s, 3cc=%s ext=%i", audio->id,
 417                 audio->config.lang.description, audio->config.lang.iso639_2,
 418                 lang_extension );
 419
 420         audio->config.in.track = i;
 421         hb_list_add( title->list_audio, audio );
 422     }
 423
 424     memcpy( title->palette,
 425             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->palette,
 426             16 * sizeof( uint32_t ) );
 427
 428     /* Check for subtitles */
 429     for( i = 0; i < vts->vtsi_mat->nr_of_vts_subp_streams; i++ )
 430     {
 431         hb_subtitle_t * subtitle;
 432         int spu_control;
 433         int position;
 434         iso639_lang_t * lang;
 435         int lang_extension = 0;
 436
 437         hb_log( "scan: checking subtitle %d", i + 1 );
 438
 439         spu_control =
 440             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->subp_control[i];
 441
 442         if( !( spu_control & 0x80000000 ) )
 443         {
 444             hb_log( "scan: subtitle channel is not active" );
 445             continue;
 446         }
 447
 448         if( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 449         {
 450             switch( vts->vtsi_mat->vts_video_attr.permitted_df )
 451             {
 452                 case 1:
 453                     position = spu_control & 0xFF;
 454                     break;
 455                 case 2:
 456                     position = ( spu_control >> 8 ) & 0xFF;
 457                     break;
 458                 default:
 459                     position = ( spu_control >> 16 ) & 0xFF;
 460             }
 461         }
 462         else
 463         {
 464             position = ( spu_control >> 24 ) & 0x7F;
 465         }
 466
 467         lang_extension = vts->vtsi_mat->vts_subp_attr[i].code_extension;
 468
 469         lang = lang_for_code( vts->vtsi_mat->vts_subp_attr[i].lang_code );
 470
 471         subtitle = calloc( sizeof( hb_subtitle_t ), 1 );
 472         subtitle->track = i+1;
 473         subtitle->id = ( ( 0x20 + position ) << 8 ) | 0xbd;
 474         snprintf( subtitle->lang, sizeof( subtitle->lang ), "%s",
 475              strlen(lang->native_name) ? lang->native_name : lang->eng_name);
 476         snprintf( subtitle->iso639_2, sizeof( subtitle->iso639_2 ), "%s",
 477                   lang->iso639_2);
 478         subtitle->format = PICTURESUB;
 479         subtitle->source = VOBSUB;
 480         subtitle->config.dest   = RENDERSUB;  // By default render (burn-in) the VOBSUB.
 481
 482         subtitle->type = lang_extension;
 483
 484         switch( lang_extension )
 485         {
 486         case 0:
 487             break;
 488         case 1:
 489             break;
 490         case 2:
 491             strcat( subtitle->lang, " (Caption with bigger size character)");
 492             break;
 493         case 3:
 494             strcat( subtitle->lang, " (Caption for Children)");
 495             break;
 496         case 4:
 497             break;
 498         case 5:
 499             strcat( subtitle->lang, " (Closed Caption)");
 500             break;
 501         case 6:
 502             strcat( subtitle->lang, " (Closed Caption with bigger size character)");
 503             break;
 504         case 7:
 505             strcat( subtitle->lang, " (Closed Caption for Children)");
 506             break;
 507         case 8:
 508             break;
 509         case 9:
 510             strcat( subtitle->lang, " (Forced Caption)");
 511             break;
 512         case 10:
 513             break;
 514         case 11:
 515             break;
 516         case 12:
 517             break;
 518         case 13:
 519             strcat( subtitle->lang, " (Director's Commentary)");
 520             break;
 521         case 14:
 522             strcat( subtitle->lang, " (Director's Commentary with bigger size character)");
 523             break;
 524         case 15:
 525             strcat( subtitle->lang, " (Director's Commentary for Children)");
 526         default:
 527             break;
 528         }
 529
 530         hb_log( "scan: id=%x, lang=%s, 3cc=%s", subtitle->id,
 531                 subtitle->lang, subtitle->iso639_2 );
 532
 533         hb_list_add( title->list_subtitle, subtitle );
 534     }
 535
 536     /* Chapters */
 537     hb_log( "scan: title %d has %d chapters", t,
 538             vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts );
 539     for( i = 0, c = 1;
 540          i < vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts; i++ )
 541     {
 542         chapter = calloc( sizeof( hb_chapter_t ), 1 );
 543         /* remember the on-disc chapter number */
 544         chapter->index = i + 1;
 545
 546         pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgcn;
 547         pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgn;
 548         d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 549
 550         /* Start cell */
 551         chapter->cell_start  = d->pgc->program_map[pgn-1] - 1;
 552         chapter->block_start =
 553             d->pgc->cell_playback[chapter->cell_start].first_sector;
 554
 555         // if there are no more programs in this pgc, the end cell is the
 556         // last cell. Otherwise it's the cell before the start cell of the
 557         // next program.
 558         if ( pgn == d->pgc->nr_of_programs )
 559         {
 560             chapter->cell_end = d->pgc->nr_of_cells - 1;
 561         }
 562         else
 563         {
 564             chapter->cell_end = d->pgc->program_map[pgn] - 2;;
 565         }
 566         chapter->block_end = d->pgc->cell_playback[chapter->cell_end].last_sector;
 567
 568         /* Block count, duration */
 569         chapter->block_count = 0;
 570         chapter->duration = 0;
 571
 572         d->cell_cur = chapter->cell_start;
 573         while( d->cell_cur <= chapter->cell_end )
 574         {
 575 #define cp d->pgc->cell_playback[d->cell_cur]
 576             chapter->block_count += cp.last_sector + 1 - cp.first_sector;
 577             chapter->duration += 90LL * dvdtime2msec( &cp.playback_time );
 578 #undef cp
 579             FindNextCell( d );
 580             d->cell_cur = d->cell_next;
 581         }
 582         hb_list_add( title->list_chapter, chapter );
 583         c++;
 584     }
 585
 586     /* The durations we get for chapters aren't precise. Scale them so
 587        the total matches the title duration */
 588     duration = 0;
 589     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 590     {
 591         chapter = hb_list_item( title->list_chapter, i );
 592         duration += chapter->duration;
 593     }
 594     duration_correction = (float) title->duration / (float) duration;
 595     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 596     {
 597         int seconds;
 598         chapter            = hb_list_item( title->list_chapter, i );
 599         chapter->duration  = duration_correction * chapter->duration;
 600         seconds            = ( chapter->duration + 45000 ) / 90000;
 601         chapter->hours     = seconds / 3600;
 602         chapter->minutes   = ( seconds % 3600 ) / 60;
 603         chapter->seconds   = seconds % 60;
 604
 605         hb_log( "scan: chap %d c=%d->%d, b=%d->%d (%d), %"PRId64" ms",
 606                 chapter->index, chapter->cell_start, chapter->cell_end,
 607                 chapter->block_start, chapter->block_end,
 608                 chapter->block_count, chapter->duration / 90 );
 609     }
 610
 611     /* Get aspect. We don't get width/height/rate infos here as
 612        they tend to be wrong */
 613     switch( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 614     {
 615         case 0:
 616             title->container_aspect = 4. / 3.;
 617             break;
 618         case 3:
 619             title->container_aspect = 16. / 9.;
 620             break;
 621         default:
 622             hb_log( "scan: unknown aspect" );
 623             goto fail;
 624     }
 625
 626     hb_log( "scan: aspect = %g", title->aspect );
 627
 628     /* This title is ok so far */
 629     goto cleanup;
 630
 631 fail:
 632     hb_list_close( &title->list_audio );
 633     free( title );
 634     title = NULL;
 635
 636 cleanup:
 637     if( vts ) ifoClose( vts );
 638
 639     return title;
 640 }
 641
 642 /***********************************************************************
 643  * hb_dvdread_start
 644  ***********************************************************************
 645  * Title and chapter start at 1
 646  **********************************************************************/
 647 static int hb_dvdread_start( hb_dvd_t * e, hb_title_t *title, int chapter )
 648 {
 649     hb_dvdread_t *d = &(e->dvdread);
 650     int pgc_id, pgn;
 651     int i;
 652     int t = title->index;
 653
 654     /* Open the IFO and the VOBs for this title */
 655     d->vts = d->vmg->tt_srpt->title[t-1].title_set_nr;
 656     d->ttn = d->vmg->tt_srpt->title[t-1].vts_ttn;
 657     if( !( d->ifo = ifoOpen( d->reader, d->vts ) ) )
 658     {
 659         hb_error( "dvd: ifoOpen failed for VTS %d", d->vts );
 660         return 0;
 661     }
 662     if( !( d->file = DVDOpenFile( d->reader, d->vts,
 663                                   DVD_READ_TITLE_VOBS ) ) )
 664     {
 665         hb_error( "dvd: DVDOpenFile failed for VTS %d", d->vts );
 666         return 0;
 667     }
 668
 669     /* Get title first and last blocks */
 670     pgc_id         = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgcn;
 671     pgn            = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgn;
 672     d->pgc         = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 673     d->cell_start  = d->pgc->program_map[pgn - 1] - 1;
 674     d->cell_end    = d->pgc->nr_of_cells - 1;
 675     d->title_start = d->pgc->cell_playback[d->cell_start].first_sector;
 676     d->title_end   = d->pgc->cell_playback[d->cell_end].last_sector;
 677
 678     /* Block count */
 679     d->title_block_count = 0;
 680     for( i = d->cell_start; i <= d->cell_end; i++ )
 681     {
 682         d->title_block_count += d->pgc->cell_playback[i].last_sector + 1 -
 683             d->pgc->cell_playback[i].first_sector;
 684     }
 685
 686     /* Get pgc for the current chapter */
 687     pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgcn;
 688     pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgn;
 689     d->pgc = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 690
 691     /* Get the two first cells */
 692     d->cell_cur = d->pgc->program_map[pgn-1] - 1;
 693     FindNextCell( d );
 694
 695     d->block     = d->pgc->cell_playback[d->cell_cur].first_sector;
 696     d->next_vobu = d->block;
 697     d->pack_len  = 0;
 698     d->cell_overlap = 0;
 699     d->in_cell = 0;
 700     d->in_sync = 2;
 701
 702     return 1;
 703 }
 704
 705 /***********************************************************************
 706  * hb_dvdread_stop
 707  ***********************************************************************
 708  *
 709  **********************************************************************/
 710 static void hb_dvdread_stop( hb_dvd_t * e )
 711 {
 712     hb_dvdread_t *d = &(e->dvdread);
 713     if( d->ifo )
 714     {
 715         ifoClose( d->ifo );
 716         d->ifo = NULL;
 717     }
 718     if( d->file )
 719     {
 720         DVDCloseFile( d->file );
 721         d->file = NULL;
 722     }
 723 }
 724
 725 /***********************************************************************
 726  * hb_dvdread_seek
 727  ***********************************************************************
 728  *
 729  **********************************************************************/
 730 static int hb_dvdread_seek( hb_dvd_t * e, float f )
 731 {
 732     hb_dvdread_t *d = &(e->dvdread);
 733     int count, sizeCell;
 734     int i;
 735
 736     count = f * d->title_block_count;
 737
 738     for( i = d->cell_start; i <= d->cell_end; i++ )
 739     {
 740         sizeCell = d->pgc->cell_playback[i].last_sector + 1 -
 741             d->pgc->cell_playback[i].first_sector;
 742
 743         if( count < sizeCell )
 744         {
 745             d->cell_cur = i;
 746             d->cur_cell_id = 0;
 747             FindNextCell( d );
 748
 749             /* Now let hb_dvdread_read find the next VOBU */
 750             d->next_vobu = d->pgc->cell_playback[i].first_sector + count;
 751             d->pack_len  = 0;
 752             break;
 753         }
 754
 755         count -= sizeCell;
 756     }
 757
 758     if( i > d->cell_end )
 759     {
 760         return 0;
 761     }
 762
 763     /*
 764      * Assume that we are in sync, even if we are not given that it is obvious
 765      * that we are out of sync if we have just done a seek.
 766      */
 767     d->in_sync = 2;
 768
 769     return 1;
 770 }
 771
 772
 773 /***********************************************************************
 774  * is_nav_pack
 775  ***********************************************************************/
 776 int is_nav_pack( unsigned char *buf )
 777 {
 778     /*
 779      * The NAV Pack is comprised of the PCI Packet and DSI Packet, both
 780      * of these start at known offsets and start with a special identifier.
 781      *
 782      * NAV = {
 783      *  PCI = { 00 00 01 bf  # private stream header
 784      *          ?? ??        # length
 785      *          00           # substream
 786      *          ...
 787      *        }
 788      *  DSI = { 00 00 01 bf  # private stream header
 789      *          ?? ??        # length
 790      *          01           # substream
 791      *          ...
 792      *        }
 793      *
 794      * The PCI starts at offset 0x26 into the sector, and the DSI starts at 0x400
 795      *
 796      * This information from: http://dvd.sourceforge.net/dvdinfo/
 797      */
 798     if( ( buf[0x26] == 0x00 &&      // PCI
 799           buf[0x27] == 0x00 &&
 800           buf[0x28] == 0x01 &&
 801           buf[0x29] == 0xbf &&
 802           buf[0x2c] == 0x00 ) &&
 803         ( buf[0x400] == 0x00 &&     // DSI
 804           buf[0x401] == 0x00 &&
 805           buf[0x402] == 0x01 &&
 806           buf[0x403] == 0xbf &&
 807           buf[0x406] == 0x01 ) )
 808     {
 809         return ( 1 );
 810     } else {
 811         return ( 0 );
 812     }
 813 }
 814
 815
 816 /***********************************************************************
 817  * hb_dvdread_read
 818  ***********************************************************************
 819  *
 820  **********************************************************************/
 821 static int hb_dvdread_read( hb_dvd_t * e, hb_buffer_t * b )
 822 {
 823     hb_dvdread_t *d = &(e->dvdread);
 824  top:
 825     if( !d->pack_len )
 826     {
 827         /* New pack */
 828         dsi_t dsi_pack;
 829         int   error = 0;
 830
 831         // if we've just finished the last cell of the title we don't
 832         // want to read another block because our next_vobu pointer
 833         // is probably invalid. Just return 'no data' & our caller
 834         // should check and discover we're at eof.
 835         if ( d->cell_cur > d->cell_end )
 836             return 0;
 837
 838         for( ;; )
 839         {
 840             int block, pack_len, next_vobu, read_retry;
 841
 842             for( read_retry = 0; read_retry < 3; read_retry++ )
 843             {
 844                 if( DVDReadBlocks( d->file, d->next_vobu, 1, b->data ) == 1 )
 845                 {
 846                     /*
 847                      * Successful read.
 848                      */
 849                     break;
 850                 } else {
 851                     hb_log( "dvd: Read Error on blk %d, attempt %d",
 852                             d->next_vobu, read_retry );
 853                 }
 854             }
 855
 856             if( read_retry == 3 )
 857             {
 858                 hb_log( "dvd: vobu read error blk %d - skipping to cell %d",
 859                         d->next_vobu, d->cell_next );
 860                 d->cell_cur  = d->cell_next;
 861                 if ( d->cell_cur > d->cell_end )
 862                     return 0;
 863                 d->in_cell = 0;
 864                 d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
 865                 FindNextCell( d );
 866                 d->cell_overlap = 1;
 867                 continue;
 868             }
 869
 870             if ( !is_nav_pack( b->data ) ) {
 871                 (d->next_vobu)++;
 872                 if( d->in_sync == 1 ) {
 873                     hb_log("dvd: Lost sync, searching for NAV pack at blk %d",
 874                            d->next_vobu);
 875                     d->in_sync = 0;
 876                 }
 877                 continue;
 878             }
 879
 880             navRead_DSI( &dsi_pack, &b->data[DSI_START_BYTE] );
 881
 882             if ( d->in_sync == 0 && d->cur_cell_id &&
 883                  (d->cur_vob_id != dsi_pack.dsi_gi.vobu_vob_idn ||
 884                   d->cur_cell_id != dsi_pack.dsi_gi.vobu_c_idn ) )
 885             {
 886                 // We walked out of the cell we're supposed to be in.
 887                 // If we're not at the start of our next cell go there.
 888                 hb_log("dvd: left cell %d (%u,%u) for (%u,%u) at block %u",
 889                        d->cell_cur, d->cur_vob_id, d->cur_cell_id,
 890                        dsi_pack.dsi_gi.vobu_vob_idn, dsi_pack.dsi_gi.vobu_c_idn,
 891                        d->next_vobu );
 892                 if ( d->next_vobu != d->pgc->cell_playback[d->cell_next].first_sector )
 893                 {
 894                     d->next_vobu = d->pgc->cell_playback[d->cell_next].first_sector;
 895                     d->cur_cell_id = 0;
 896                     continue;
 897                 }
 898             }
 899
 900             block     = dsi_pack.dsi_gi.nv_pck_lbn;
 901             pack_len  = dsi_pack.dsi_gi.vobu_ea;
 902
 903             // There are a total of 21 next vobu offsets (and 21 prev_vobu
 904             // offsets) in the navpack SRI structure. The primary one is
 905             // 'next_vobu' which is the offset (in dvd blocks) from the current
 906             // block to the start of the next vobu. If the block at 'next_vobu'
 907             // can't be read, 'next_video' is the offset to the vobu closest to it.
 908             // The other 19 offsets are vobus at successively longer distances from
 909             // the current block (this is so that a hardware player can do
 910             // adaptive error recovery to skip over a bad spot on the disk). In all
 911             // these offsets the high bit is set to indicate when it contains a
 912             // valid offset. The next bit (2^30) is set to indicate that there's
 913             // another valid offset in the SRI that's closer to the current block.
 914             // A hardware player uses these bits to chose the closest valid offset
 915             // and uses that as its next vobu. (Some mastering schemes appear to
 916             // put a bogus offset in next_vobu with the 2^30 bit set & the
 917             // correct offset in next_video. This works fine in hardware players
 918             // but will mess up software that doesn't implement the full next
 919             // vobu decision logic.) In addition to the flag bits there's a
 920             // reserved value of the offset that indicates 'no next vobu' (which
 921             // indicates the end of a cell). But having no next vobu pointer with a
 922             // 'valid' bit set also indicates end of cell. Different mastering
 923             // schemes seem to use all possible combinations of the flag bits
 924             // and reserved values to indicate end of cell so we have to check
 925             // them all or we'll get a disk read error from following an
 926             // invalid offset.
 927             uint32_t next_ptr = dsi_pack.vobu_sri.next_vobu;
 928             if ( ( next_ptr & ( 1 << 31 ) ) == 0  ||
 929                  ( next_ptr & ( 1 << 30 ) ) != 0 ||
 930                  ( next_ptr & 0x3fffffff ) == 0x3fffffff )
 931             {
 932                 next_ptr = dsi_pack.vobu_sri.next_video;
 933                 if ( ( next_ptr & ( 1 << 31 ) ) == 0 ||
 934                      ( next_ptr & 0x3fffffff ) == 0x3fffffff )
 935                 {
 936                     // don't have a valid forward pointer - assume end-of-cell
 937                     d->block     = block;
 938                     d->pack_len  = pack_len;
 939                     break;
 940                 }
 941             }
 942             next_vobu = block + ( next_ptr & 0x3fffffff );
 943
 944             if( pack_len >  0    &&
 945                 pack_len <  1024 &&
 946                 block    >= d->next_vobu &&
 947                 ( block <= d->title_start + d->title_block_count ||
 948                   block <= d->title_end ) )
 949             {
 950                 d->block     = block;
 951                 d->pack_len  = pack_len;
 952                 d->next_vobu = next_vobu;
 953                 break;
 954             }
 955
 956             /* Wasn't a valid VOBU, try next block */
 957             if( ++error > 1024 )
 958             {
 959                 hb_log( "dvd: couldn't find a VOBU after 1024 blocks" );
 960                 return 0;
 961             }
 962
 963             (d->next_vobu)++;
 964         }
 965
 966         if( d->in_sync == 0 || d->in_sync == 2 )
 967         {
 968             if( d->in_sync == 0 )
 969             {
 970                 hb_log( "dvd: In sync with DVD at block %d", d->block );
 971             }
 972             d->in_sync = 1;
 973         }
 974
 975         // Revert the cell overlap, and check for a chapter break
 976         // If this cell is zero length (prev_vobu & next_vobu both
 977         // set to END_OF_CELL) we need to check for beginning of
 978         // cell before checking for end or we'll advance to the next
 979         // cell too early and fail to generate a chapter mark when this
 980         // cell starts a chapter.
 981         if( ( dsi_pack.vobu_sri.prev_vobu & (1 << 31 ) ) == 0 ||
 982             ( dsi_pack.vobu_sri.prev_vobu & 0x3fffffff ) == 0x3fffffff )
 983         {
 984             // A vobu that's not at the start of a cell can have an
 985             // EOC prev pointer (this seems to be associated with some
 986             // sort of drm). The rest of the content in the cell may be
 987             // booby-trapped so treat this like an end-of-cell rather
 988             // than a beginning of cell.
 989             if ( d->pgc->cell_playback[d->cell_cur].first_sector < dsi_pack.dsi_gi.nv_pck_lbn &&
 990                  d->pgc->cell_playback[d->cell_cur].last_sector >= dsi_pack.dsi_gi.nv_pck_lbn )
 991             {
 992                 hb_log( "dvd: null prev_vobu in cell %d at block %d", d->cell_cur,
 993                         d->block );
 994                 // treat like end-of-cell then go directly to start of next cell.
 995                 d->cell_cur  = d->cell_next;
 996                 d->in_cell = 0;
 997                 d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
 998                 FindNextCell( d );
 999                 d->cell_overlap = 1;
1000                 goto top;
1001             }
1002             else
1003             {
1004                 if ( d->block != d->pgc->cell_playback[d->cell_cur].first_sector )
1005                 {
1006                     hb_log( "dvd: beginning of cell %d at block %d", d->cell_cur,
1007                            d->block );
1008                 }
1009                 if( d->in_cell )
1010                 {
1011                     hb_error( "dvd: assuming missed end of cell %d", d->cell_cur );
1012                     d->cell_cur  = d->cell_next;
1013                     d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
1014                     FindNextCell( d );
1015                     d->cell_overlap = 1;
1016                     d->in_cell = 0;
1017                 } else {
1018                     d->in_cell = 1;
1019                 }
1020                 d->cur_vob_id = dsi_pack.dsi_gi.vobu_vob_idn;
1021                 d->cur_cell_id = dsi_pack.dsi_gi.vobu_c_idn;
1022
1023                 if( d->cell_overlap )
1024                 {
1025                     b->new_chap = hb_dvdread_is_break( d );
1026                     d->cell_overlap = 0;
1027                 }
1028             }
1029         }
1030
1031         if( ( dsi_pack.vobu_sri.next_vobu & (1 << 31 ) ) == 0 ||
1032             ( dsi_pack.vobu_sri.next_vobu & 0x3fffffff ) == 0x3fffffff )
1033         {
1034             if ( d->block <= d->pgc->cell_playback[d->cell_cur].first_sector ||
1035                  d->block > d->pgc->cell_playback[d->cell_cur].last_sector )
1036             {
1037                 hb_log( "dvd: end of cell %d at block %d", d->cell_cur,
1038                         d->block );
1039             }
1040             d->cell_cur  = d->cell_next;
1041             d->in_cell = 0;
1042             d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
1043             FindNextCell( d );
1044             d->cell_overlap = 1;
1045
1046         }
1047     }
1048     else
1049     {
1050         if( DVDReadBlocks( d->file, d->block, 1, b->data ) != 1 )
1051         {
1052             // this may be a real DVD error or may be DRM. Either way
1053             // we don't want to quit because of one bad block so set
1054             // things up so we'll advance to the next vobu and recurse.
1055             hb_error( "dvd: DVDReadBlocks failed (%d), skipping to vobu %u",
1056                       d->block, d->next_vobu );
1057             d->pack_len = 0;
1058             goto top;  /* XXX need to restructure this routine & avoid goto */
1059         }
1060         d->pack_len--;
1061     }
1062
1063     d->block++;
1064
1065     return 1;
1066 }
1067
1068 /***********************************************************************
1069  * hb_dvdread_chapter
1070  ***********************************************************************
1071  * Returns in which chapter the next block to be read is.
1072  * Chapter numbers start at 1.
1073  **********************************************************************/
1074 static int hb_dvdread_chapter( hb_dvd_t * e )
1075 {
1076     hb_dvdread_t *d = &(e->dvdread);
1077     int     i;
1078     int     pgc_id, pgn;
1079     int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
1080     pgc_t * pgc;
1081
1082     for( i = nr_of_ptts - 1;
1083          i >= 0;
1084          i-- )
1085     {
1086         /* Get pgc for chapter (i+1) */
1087         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
1088         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
1089         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
1090
1091         if( d->cell_cur - d->cell_overlap >= pgc->program_map[pgn-1] - 1 &&
1092             d->cell_cur - d->cell_overlap <= pgc->nr_of_cells - 1 )
1093         {
1094             /* We are in this chapter */
1095             return i + 1;
1096         }
1097     }
1098
1099     /* End of title */
1100     return -1;
1101 }
1102
1103 /***********************************************************************
1104  * hb_dvdread_is_break
1105  ***********************************************************************
1106  * Returns chapter number if the current block is a new chapter start
1107  **********************************************************************/
1108 static int hb_dvdread_is_break( hb_dvdread_t * d )
1109 {
1110     int     i;
1111     int     pgc_id, pgn;
1112     int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
1113     pgc_t * pgc;
1114     int     cell;
1115
1116     for( i = nr_of_ptts - 1;
1117          i > 0;
1118          i-- )
1119     {
1120         /* Get pgc for chapter (i+1) */
1121         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
1122         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
1123         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
1124         cell   = pgc->program_map[pgn-1] - 1;
1125
1126         if( cell <= d->cell_start )
1127             break;
1128
1129         // This must not match against the start cell.
1130         if( pgc->cell_playback[cell].first_sector == d->block && cell != d->cell_start )
1131         {
1132             return i + 1;
1133         }
1134     }
1135
1136     return 0;
1137 }
1138
1139 /***********************************************************************
1140  * hb_dvdread_close
1141  ***********************************************************************
1142  * Closes and frees everything
1143  **********************************************************************/
1144 static void hb_dvdread_close( hb_dvd_t ** _d )
1145 {
1146     hb_dvdread_t * d = &((*_d)->dvdread);
1147
1148     if( d->vmg )
1149     {
1150         ifoClose( d->vmg );
1151     }
1152     if( d->reader )
1153     {
1154         DVDClose( d->reader );
1155     }
1156
1157     free( d );
1158     *_d = NULL;
1159 }
1160
1161 /***********************************************************************
1162  * hb_dvdread_angle_count
1163  ***********************************************************************
1164  * Returns the number of angles supported.  We do not support angles
1165  * with dvdread
1166  **********************************************************************/
1167 static int hb_dvdread_angle_count( hb_dvd_t * d )
1168 {
1169     return 1;
1170 }
1171
1172 /***********************************************************************
1173  * hb_dvdread_set_angle
1174  ***********************************************************************
1175  * Sets the angle to read.  Not supported with dvdread
1176  **********************************************************************/
1177 static void hb_dvdread_set_angle( hb_dvd_t * d, int angle )
1178 {
1179 }
1180
1181 /***********************************************************************
1182  * FindNextCell
1183  ***********************************************************************
1184  * Assumes pgc and cell_cur are correctly set, and sets cell_next to the
1185  * cell to be read when we will be done with cell_cur.
1186  **********************************************************************/
1187 static void FindNextCell( hb_dvdread_t * d )
1188 {
1189     int i = 0;
1190
1191     if( d->pgc->cell_playback[d->cell_cur].block_type ==
1192             BLOCK_TYPE_ANGLE_BLOCK )
1193     {
1194
1195         while( d->pgc->cell_playback[d->cell_cur+i].block_mode !=
1196                    BLOCK_MODE_LAST_CELL )
1197         {
1198              i++;
1199         }
1200         d->cell_next = d->cell_cur + i + 1;
1201         hb_log( "dvd: Skipping multi-angle cells %d-%d",
1202                 d->cell_cur,
1203                 d->cell_next - 1 );
1204     }
1205     else
1206     {
1207         d->cell_next = d->cell_cur + 1;
1208     }
1209 }
1210
1211 /***********************************************************************
1212  * dvdtime2msec
1213  ***********************************************************************
1214  * From lsdvd
1215  **********************************************************************/
1216 static int dvdtime2msec(dvd_time_t * dt)
1217 {
1218     double frames_per_s[4] = {-1.0, 25.00, -1.0, 29.97};
1219     double fps = frames_per_s[(dt->frame_u & 0xc0) >> 6];
1220     long   ms;
1221     ms  = (((dt->hour &   0xf0) >> 3) * 5 + (dt->hour   & 0x0f)) * 3600000;
1222     ms += (((dt->minute & 0xf0) >> 3) * 5 + (dt->minute & 0x0f)) * 60000;
1223     ms += (((dt->second & 0xf0) >> 3) * 5 + (dt->second & 0x0f)) * 1000;
1224
1225     if( fps > 0 )
1226     {
1227         ms += ((dt->frame_u & 0x30) >> 3) * 5 +
1228               (dt->frame_u & 0x0f) * 1000.0 / fps;
1229     }
1230
1231     return ms;
1232 }
1233
1234 char * hb_dvd_name( char * path )
1235 {
1236     return dvd_methods->name(path);
1237 }
1238
1239 hb_dvd_t * hb_dvd_init( char * path )
1240 {
1241     return dvd_methods->init(path);
1242 }
1243
1244 int hb_dvd_title_count( hb_dvd_t * d )
1245 {
1246     return dvd_methods->title_count(d);
1247 }
1248
1249 hb_title_t * hb_dvd_title_scan( hb_dvd_t * d, int t )
1250 {
1251     return dvd_methods->title_scan(d, t);
1252 }
1253
1254 int hb_dvd_start( hb_dvd_t * d, hb_title_t *title, int chapter )
1255 {
1256     return dvd_methods->start(d, title, chapter);
1257 }
1258
1259 void hb_dvd_stop( hb_dvd_t * d )
1260 {
1261     dvd_methods->stop(d);
1262 }
1263
1264 int hb_dvd_seek( hb_dvd_t * d, float f )
1265 {
1266     return dvd_methods->seek(d, f);
1267 }
1268
1269 int hb_dvd_read( hb_dvd_t * d, hb_buffer_t * b )
1270 {
1271     return dvd_methods->read(d, b);
1272 }
1273
1274 int hb_dvd_chapter( hb_dvd_t * d )
1275 {
1276     return dvd_methods->chapter(d);
1277 }
1278
1279 void hb_dvd_close( hb_dvd_t ** _d )
1280 {
1281     dvd_methods->close(_d);
1282 }
1283
1284 int hb_dvd_angle_count( hb_dvd_t * d )
1285 {
1286     return dvd_methods->angle_count(d);
1287 }
1288
1289 void hb_dvd_set_angle( hb_dvd_t * d, int angle )
1290 {
1291     dvd_methods->set_angle(d, angle);
1292 }
1293
1294 // hb_dvd_set_dvdnav must only be called when no dvd source is open
1295 // it rips the rug out from under things so be careful
1296 void hb_dvd_set_dvdnav( int enable )
1297 {
1298     if (enable)
1299         dvd_methods = hb_dvdnav_methods();
1300     else
1301         dvd_methods = hb_dvdread_methods();
1302 }
1303