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     title->type = HB_DVD_TYPE;
 162
 163     if( DVDUDFVolumeInfo( d->reader, title->name, sizeof( title->name ),
 164                           unused, sizeof( unused ) ) )
 165     {
 166         char * p_cur, * p_last = d->path;
 167         for( p_cur = d->path; *p_cur; p_cur++ )
 168         {
 169             if( p_cur[0] == '/' && p_cur[1] )
 170             {
 171                 p_last = &p_cur[1];
 172             }
 173         }
 174         snprintf( title->name, sizeof( title->name ), "%s", p_last );
 175     }
 176
 177     /* VTS which our title is in */
 178     title->vts = d->vmg->tt_srpt->title[t-1].title_set_nr;
 179
 180     if ( !title->vts )
 181     {
 182         /* A VTS of 0 means the title wasn't found in the title set */
 183         hb_error("Invalid VTS (title set) number: %i", title->vts);
 184         goto fail;
 185     }
 186
 187     hb_log( "scan: opening IFO for VTS %d", title->vts );
 188     if( !( vts = ifoOpen( d->reader, title->vts ) ) )
 189     {
 190         hb_error( "scan: ifoOpen failed" );
 191         goto fail;
 192     }
 193
 194     /* ignore titles with bogus cell addresses so we don't abort later
 195      * in libdvdread. */
 196     for ( i = 0; i < vts->vts_c_adt->nr_of_vobs; ++i)
 197     {
 198         if( (vts->vts_c_adt->cell_adr_table[i].start_sector & 0xffffff ) ==
 199             0xffffff )
 200         {
 201             hb_error( "scan: cell_adr_table[%d].start_sector invalid (0x%x) "
 202                       "- skipping title", i,
 203                       vts->vts_c_adt->cell_adr_table[i].start_sector );
 204             goto fail;
 205         }
 206         if( (vts->vts_c_adt->cell_adr_table[i].last_sector & 0xffffff ) ==
 207             0xffffff )
 208         {
 209             hb_error( "scan: cell_adr_table[%d].last_sector invalid (0x%x) "
 210                       "- skipping title", i,
 211                       vts->vts_c_adt->cell_adr_table[i].last_sector );
 212             goto fail;
 213         }
 214         if( vts->vts_c_adt->cell_adr_table[i].start_sector >=
 215             vts->vts_c_adt->cell_adr_table[i].last_sector )
 216         {
 217             hb_error( "scan: cell_adr_table[%d].start_sector (0x%x) "
 218                       "is not before last_sector (0x%x) - skipping title", i,
 219                       vts->vts_c_adt->cell_adr_table[i].start_sector,
 220                       vts->vts_c_adt->cell_adr_table[i].last_sector );
 221             goto fail;
 222         }
 223     }
 224
 225     if( global_verbosity_level == 3 )
 226     {
 227         ifo_print( d->reader, title->vts );
 228     }
 229
 230     /* Position of the title in the VTS */
 231     title->ttn = d->vmg->tt_srpt->title[t-1].vts_ttn;
 232     if ( title->ttn < 1 || title->ttn > vts->vts_ptt_srpt->nr_of_srpts )
 233     {
 234         hb_error( "invalid VTS PTT offset %d for title %d, skipping", title->ttn, t );
 235         goto fail;
 236     }
 237
 238     /* Get pgc */
 239     pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgcn;
 240     if ( pgc_id < 1 || pgc_id > vts->vts_pgcit->nr_of_pgci_srp )
 241     {
 242         hb_error( "invalid PGC ID %d for title %d, skipping", pgc_id, t );
 243         goto fail;
 244     }
 245     pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[0].pgn;
 246     d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 247
 248     hb_log("pgc_id: %d, pgn: %d: pgc: %p", pgc_id, pgn, d->pgc);
 249
 250     if( !d->pgc )
 251     {
 252         hb_error( "scan: pgc not valid, skipping" );
 253         goto fail;
 254     }
 255
 256     if( pgn <= 0 || pgn > 99 )
 257     {
 258         hb_error( "scan: pgn %d not valid, skipping", pgn );
 259         goto fail;
 260     }
 261
 262     /* Start cell */
 263     title->cell_start  = d->pgc->program_map[pgn-1] - 1;
 264     title->block_start = d->pgc->cell_playback[title->cell_start].first_sector;
 265
 266     /* End cell */
 267     title->cell_end  = d->pgc->nr_of_cells - 1;
 268     title->block_end = d->pgc->cell_playback[title->cell_end].last_sector;
 269
 270     /* Block count */
 271     title->block_count = 0;
 272     d->cell_cur = title->cell_start;
 273     while( d->cell_cur <= title->cell_end )
 274     {
 275 #define cp d->pgc->cell_playback[d->cell_cur]
 276         title->block_count += cp.last_sector + 1 - cp.first_sector;
 277 #undef cp
 278         FindNextCell( d );
 279         d->cell_cur = d->cell_next;
 280     }
 281
 282     hb_log( "scan: vts=%d, ttn=%d, cells=%d->%d, blocks=%d->%d, "
 283             "%d blocks", title->vts, title->ttn, title->cell_start,
 284             title->cell_end, title->block_start, title->block_end,
 285             title->block_count );
 286
 287     /* Get duration */
 288     title->duration = 90LL * dvdtime2msec( &d->pgc->playback_time );
 289     title->hours    = title->duration / 90000 / 3600;
 290     title->minutes  = ( ( title->duration / 90000 ) % 3600 ) / 60;
 291     title->seconds  = ( title->duration / 90000 ) % 60;
 292     hb_log( "scan: duration is %02d:%02d:%02d (%"PRId64" ms)",
 293             title->hours, title->minutes, title->seconds,
 294             title->duration / 90 );
 295
 296     /* ignore titles under 10 seconds because they're often stills or
 297      * clips with no audio & our preview code doesn't currently handle
 298      * either of these. */
 299     if( title->duration < 900000LL )
 300     {
 301         hb_log( "scan: ignoring title (too short)" );
 302         goto fail;
 303     }
 304
 305     /* Detect languages */
 306     for( i = 0; i < vts->vtsi_mat->nr_of_vts_audio_streams; i++ )
 307     {
 308         hb_audio_t * audio, * audio_tmp;
 309         int          audio_format, lang_code, audio_control,
 310                      position, j;
 311         iso639_lang_t * lang;
 312         int lang_extension = 0;
 313
 314         hb_log( "scan: checking audio %d", i + 1 );
 315
 316         audio = calloc( sizeof( hb_audio_t ), 1 );
 317
 318         audio_format  = vts->vtsi_mat->vts_audio_attr[i].audio_format;
 319         lang_code     = vts->vtsi_mat->vts_audio_attr[i].lang_code;
 320         lang_extension = vts->vtsi_mat->vts_audio_attr[i].code_extension;
 321         audio_control =
 322             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->audio_control[i];
 323
 324         if( !( audio_control & 0x8000 ) )
 325         {
 326             hb_log( "scan: audio channel is not active" );
 327             free( audio );
 328             continue;
 329         }
 330
 331         position = ( audio_control & 0x7F00 ) >> 8;
 332
 333         switch( audio_format )
 334         {
 335             case 0x00:
 336                 audio->id    = ( ( 0x80 + position ) << 8 ) | 0xbd;
 337                 audio->config.in.codec = HB_ACODEC_AC3;
 338                 break;
 339
 340             case 0x02:
 341             case 0x03:
 342                 audio->id    = 0xc0 + position;
 343                 audio->config.in.codec = HB_ACODEC_MPGA;
 344                 break;
 345
 346             case 0x04:
 347                 audio->id    = ( ( 0xa0 + position ) << 8 ) | 0xbd;
 348                 audio->config.in.codec = HB_ACODEC_LPCM;
 349                 break;
 350
 351             case 0x06:
 352                 audio->id    = ( ( 0x88 + position ) << 8 ) | 0xbd;
 353                 audio->config.in.codec = HB_ACODEC_DCA;
 354                 break;
 355
 356             default:
 357                 audio->id    = 0;
 358                 audio->config.in.codec = 0;
 359                 hb_log( "scan: unknown audio codec (%x)",
 360                         audio_format );
 361                 break;
 362         }
 363         if( !audio->id )
 364         {
 365             continue;
 366         }
 367
 368         /* Check for duplicate tracks */
 369         audio_tmp = NULL;
 370         for( j = 0; j < hb_list_count( title->list_audio ); j++ )
 371         {
 372             audio_tmp = hb_list_item( title->list_audio, j );
 373             if( audio->id == audio_tmp->id )
 374             {
 375                 break;
 376             }
 377             audio_tmp = NULL;
 378         }
 379         if( audio_tmp )
 380         {
 381             hb_log( "scan: duplicate audio track" );
 382             free( audio );
 383             continue;
 384         }
 385
 386         audio->config.lang.type = lang_extension;
 387
 388         lang = lang_for_code( vts->vtsi_mat->vts_audio_attr[i].lang_code );
 389
 390         snprintf( audio->config.lang.description, sizeof( audio->config.lang.description ), "%s (%s)",
 391             strlen(lang->native_name) ? lang->native_name : lang->eng_name,
 392             audio->config.in.codec == HB_ACODEC_AC3 ? "AC3" : ( audio->config.in.codec ==
 393                 HB_ACODEC_DCA ? "DTS" : ( audio->config.in.codec ==
 394                 HB_ACODEC_MPGA ? "MPEG" : "LPCM" ) ) );
 395         snprintf( audio->config.lang.simple, sizeof( audio->config.lang.simple ), "%s",
 396                   strlen(lang->native_name) ? lang->native_name : lang->eng_name );
 397         snprintf( audio->config.lang.iso639_2, sizeof( audio->config.lang.iso639_2 ), "%s",
 398                   lang->iso639_2);
 399
 400         switch( lang_extension )
 401         {
 402         case 0:
 403         case 1:
 404             break;
 405         case 2:
 406             strcat( audio->config.lang.description, " (Visually Impaired)" );
 407             break;
 408         case 3:
 409             strcat( audio->config.lang.description, " (Director's Commentary 1)" );
 410             break;
 411         case 4:
 412             strcat( audio->config.lang.description, " (Director's Commentary 2)" );
 413             break;
 414         default:
 415             break;
 416         }
 417
 418         hb_log( "scan: id=%x, lang=%s, 3cc=%s ext=%i", audio->id,
 419                 audio->config.lang.description, audio->config.lang.iso639_2,
 420                 lang_extension );
 421
 422         audio->config.in.track = i;
 423         hb_list_add( title->list_audio, audio );
 424     }
 425
 426     memcpy( title->palette,
 427             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->palette,
 428             16 * sizeof( uint32_t ) );
 429
 430     /* Check for subtitles */
 431     for( i = 0; i < vts->vtsi_mat->nr_of_vts_subp_streams; i++ )
 432     {
 433         hb_subtitle_t * subtitle;
 434         int spu_control;
 435         int position;
 436         iso639_lang_t * lang;
 437         int lang_extension = 0;
 438
 439         hb_log( "scan: checking subtitle %d", i + 1 );
 440
 441         spu_control =
 442             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->subp_control[i];
 443
 444         if( !( spu_control & 0x80000000 ) )
 445         {
 446             hb_log( "scan: subtitle channel is not active" );
 447             continue;
 448         }
 449
 450         if( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 451         {
 452             switch( vts->vtsi_mat->vts_video_attr.permitted_df )
 453             {
 454                 case 1:
 455                     position = spu_control & 0xFF;
 456                     break;
 457                 case 2:
 458                     position = ( spu_control >> 8 ) & 0xFF;
 459                     break;
 460                 default:
 461                     position = ( spu_control >> 16 ) & 0xFF;
 462             }
 463         }
 464         else
 465         {
 466             position = ( spu_control >> 24 ) & 0x7F;
 467         }
 468
 469         lang_extension = vts->vtsi_mat->vts_subp_attr[i].code_extension;
 470
 471         lang = lang_for_code( vts->vtsi_mat->vts_subp_attr[i].lang_code );
 472
 473         subtitle = calloc( sizeof( hb_subtitle_t ), 1 );
 474         subtitle->track = i+1;
 475         subtitle->id = ( ( 0x20 + position ) << 8 ) | 0xbd;
 476         snprintf( subtitle->lang, sizeof( subtitle->lang ), "%s",
 477              strlen(lang->native_name) ? lang->native_name : lang->eng_name);
 478         snprintf( subtitle->iso639_2, sizeof( subtitle->iso639_2 ), "%s",
 479                   lang->iso639_2);
 480         subtitle->format = PICTURESUB;
 481         subtitle->source = VOBSUB;
 482         subtitle->config.dest   = RENDERSUB;  // By default render (burn-in) the VOBSUB.
 483
 484         subtitle->type = lang_extension;
 485
 486         switch( lang_extension )
 487         {
 488         case 0:
 489             break;
 490         case 1:
 491             break;
 492         case 2:
 493             strcat( subtitle->lang, " (Caption with bigger size character)");
 494             break;
 495         case 3:
 496             strcat( subtitle->lang, " (Caption for Children)");
 497             break;
 498         case 4:
 499             break;
 500         case 5:
 501             strcat( subtitle->lang, " (Closed Caption)");
 502             break;
 503         case 6:
 504             strcat( subtitle->lang, " (Closed Caption with bigger size character)");
 505             break;
 506         case 7:
 507             strcat( subtitle->lang, " (Closed Caption for Children)");
 508             break;
 509         case 8:
 510             break;
 511         case 9:
 512             strcat( subtitle->lang, " (Forced Caption)");
 513             break;
 514         case 10:
 515             break;
 516         case 11:
 517             break;
 518         case 12:
 519             break;
 520         case 13:
 521             strcat( subtitle->lang, " (Director's Commentary)");
 522             break;
 523         case 14:
 524             strcat( subtitle->lang, " (Director's Commentary with bigger size character)");
 525             break;
 526         case 15:
 527             strcat( subtitle->lang, " (Director's Commentary for Children)");
 528         default:
 529             break;
 530         }
 531
 532         hb_log( "scan: id=%x, lang=%s, 3cc=%s", subtitle->id,
 533                 subtitle->lang, subtitle->iso639_2 );
 534
 535         hb_list_add( title->list_subtitle, subtitle );
 536     }
 537
 538     /* Chapters */
 539     hb_log( "scan: title %d has %d chapters", t,
 540             vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts );
 541     for( i = 0, c = 1;
 542          i < vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts; i++ )
 543     {
 544         chapter = calloc( sizeof( hb_chapter_t ), 1 );
 545         /* remember the on-disc chapter number */
 546         chapter->index = i + 1;
 547
 548         pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgcn;
 549         pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgn;
 550         d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 551
 552         /* Start cell */
 553         chapter->cell_start  = d->pgc->program_map[pgn-1] - 1;
 554         chapter->block_start =
 555             d->pgc->cell_playback[chapter->cell_start].first_sector;
 556
 557         // if there are no more programs in this pgc, the end cell is the
 558         // last cell. Otherwise it's the cell before the start cell of the
 559         // next program.
 560         if ( pgn == d->pgc->nr_of_programs )
 561         {
 562             chapter->cell_end = d->pgc->nr_of_cells - 1;
 563         }
 564         else
 565         {
 566             chapter->cell_end = d->pgc->program_map[pgn] - 2;;
 567         }
 568         chapter->block_end = d->pgc->cell_playback[chapter->cell_end].last_sector;
 569
 570         /* Block count, duration */
 571         chapter->block_count = 0;
 572         chapter->duration = 0;
 573
 574         d->cell_cur = chapter->cell_start;
 575         while( d->cell_cur <= chapter->cell_end )
 576         {
 577 #define cp d->pgc->cell_playback[d->cell_cur]
 578             chapter->block_count += cp.last_sector + 1 - cp.first_sector;
 579             chapter->duration += 90LL * dvdtime2msec( &cp.playback_time );
 580 #undef cp
 581             FindNextCell( d );
 582             d->cell_cur = d->cell_next;
 583         }
 584         hb_list_add( title->list_chapter, chapter );
 585         c++;
 586     }
 587
 588     /* The durations we get for chapters aren't precise. Scale them so
 589        the total matches the title duration */
 590     duration = 0;
 591     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 592     {
 593         chapter = hb_list_item( title->list_chapter, i );
 594         duration += chapter->duration;
 595     }
 596     duration_correction = (float) title->duration / (float) duration;
 597     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 598     {
 599         int seconds;
 600         chapter            = hb_list_item( title->list_chapter, i );
 601         chapter->duration  = duration_correction * chapter->duration;
 602         seconds            = ( chapter->duration + 45000 ) / 90000;
 603         chapter->hours     = seconds / 3600;
 604         chapter->minutes   = ( seconds % 3600 ) / 60;
 605         chapter->seconds   = seconds % 60;
 606
 607         hb_log( "scan: chap %d c=%d->%d, b=%d->%d (%d), %"PRId64" ms",
 608                 chapter->index, chapter->cell_start, chapter->cell_end,
 609                 chapter->block_start, chapter->block_end,
 610                 chapter->block_count, chapter->duration / 90 );
 611     }
 612
 613     /* Get aspect. We don't get width/height/rate infos here as
 614        they tend to be wrong */
 615     switch( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 616     {
 617         case 0:
 618             title->container_aspect = 4. / 3.;
 619             break;
 620         case 3:
 621             title->container_aspect = 16. / 9.;
 622             break;
 623         default:
 624             hb_log( "scan: unknown aspect" );
 625             goto fail;
 626     }
 627
 628     hb_log( "scan: aspect = %g", title->aspect );
 629
 630     /* This title is ok so far */
 631     goto cleanup;
 632
 633 fail:
 634     hb_list_close( &title->list_audio );
 635     free( title );
 636     title = NULL;
 637
 638 cleanup:
 639     if( vts ) ifoClose( vts );
 640
 641     return title;
 642 }
 643
 644 /***********************************************************************
 645  * hb_dvdread_start
 646  ***********************************************************************
 647  * Title and chapter start at 1
 648  **********************************************************************/
 649 static int hb_dvdread_start( hb_dvd_t * e, hb_title_t *title, int chapter )
 650 {
 651     hb_dvdread_t *d = &(e->dvdread);
 652     int pgc_id, pgn;
 653     int i;
 654     int t = title->index;
 655
 656     /* Open the IFO and the VOBs for this title */
 657     d->vts = d->vmg->tt_srpt->title[t-1].title_set_nr;
 658     d->ttn = d->vmg->tt_srpt->title[t-1].vts_ttn;
 659     if( !( d->ifo = ifoOpen( d->reader, d->vts ) ) )
 660     {
 661         hb_error( "dvd: ifoOpen failed for VTS %d", d->vts );
 662         return 0;
 663     }
 664     if( !( d->file = DVDOpenFile( d->reader, d->vts,
 665                                   DVD_READ_TITLE_VOBS ) ) )
 666     {
 667         hb_error( "dvd: DVDOpenFile failed for VTS %d", d->vts );
 668         return 0;
 669     }
 670
 671     /* Get title first and last blocks */
 672     pgc_id         = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgcn;
 673     pgn            = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgn;
 674     d->pgc         = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 675     d->cell_start  = d->pgc->program_map[pgn - 1] - 1;
 676     d->cell_end    = d->pgc->nr_of_cells - 1;
 677     d->title_start = d->pgc->cell_playback[d->cell_start].first_sector;
 678     d->title_end   = d->pgc->cell_playback[d->cell_end].last_sector;
 679
 680     /* Block count */
 681     d->title_block_count = 0;
 682     for( i = d->cell_start; i <= d->cell_end; i++ )
 683     {
 684         d->title_block_count += d->pgc->cell_playback[i].last_sector + 1 -
 685             d->pgc->cell_playback[i].first_sector;
 686     }
 687
 688     /* Get pgc for the current chapter */
 689     pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgcn;
 690     pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgn;
 691     d->pgc = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 692
 693     /* Get the two first cells */
 694     d->cell_cur = d->pgc->program_map[pgn-1] - 1;
 695     FindNextCell( d );
 696
 697     d->block     = d->pgc->cell_playback[d->cell_cur].first_sector;
 698     d->next_vobu = d->block;
 699     d->pack_len  = 0;
 700     d->cell_overlap = 0;
 701     d->in_cell = 0;
 702     d->in_sync = 2;
 703
 704     return 1;
 705 }
 706
 707 /***********************************************************************
 708  * hb_dvdread_stop
 709  ***********************************************************************
 710  *
 711  **********************************************************************/
 712 static void hb_dvdread_stop( hb_dvd_t * e )
 713 {
 714     hb_dvdread_t *d = &(e->dvdread);
 715     if( d->ifo )
 716     {
 717         ifoClose( d->ifo );
 718         d->ifo = NULL;
 719     }
 720     if( d->file )
 721     {
 722         DVDCloseFile( d->file );
 723         d->file = NULL;
 724     }
 725 }
 726
 727 /***********************************************************************
 728  * hb_dvdread_seek
 729  ***********************************************************************
 730  *
 731  **********************************************************************/
 732 static int hb_dvdread_seek( hb_dvd_t * e, float f )
 733 {
 734     hb_dvdread_t *d = &(e->dvdread);
 735     int count, sizeCell;
 736     int i;
 737
 738     count = f * d->title_block_count;
 739
 740     for( i = d->cell_start; i <= d->cell_end; i++ )
 741     {
 742         sizeCell = d->pgc->cell_playback[i].last_sector + 1 -
 743             d->pgc->cell_playback[i].first_sector;
 744
 745         if( count < sizeCell )
 746         {
 747             d->cell_cur = i;
 748             d->cur_cell_id = 0;
 749             FindNextCell( d );
 750
 751             /* Now let hb_dvdread_read find the next VOBU */
 752             d->next_vobu = d->pgc->cell_playback[i].first_sector + count;
 753             d->pack_len  = 0;
 754             break;
 755         }
 756
 757         count -= sizeCell;
 758     }
 759
 760     if( i > d->cell_end )
 761     {
 762         return 0;
 763     }
 764
 765     /*
 766      * Assume that we are in sync, even if we are not given that it is obvious
 767      * that we are out of sync if we have just done a seek.
 768      */
 769     d->in_sync = 2;
 770
 771     return 1;
 772 }
 773
 774
 775 /***********************************************************************
 776  * is_nav_pack
 777  ***********************************************************************/
 778 int is_nav_pack( unsigned char *buf )
 779 {
 780     /*
 781      * The NAV Pack is comprised of the PCI Packet and DSI Packet, both
 782      * of these start at known offsets and start with a special identifier.
 783      *
 784      * NAV = {
 785      *  PCI = { 00 00 01 bf  # private stream header
 786      *          ?? ??        # length
 787      *          00           # substream
 788      *          ...
 789      *        }
 790      *  DSI = { 00 00 01 bf  # private stream header
 791      *          ?? ??        # length
 792      *          01           # substream
 793      *          ...
 794      *        }
 795      *
 796      * The PCI starts at offset 0x26 into the sector, and the DSI starts at 0x400
 797      *
 798      * This information from: http://dvd.sourceforge.net/dvdinfo/
 799      */
 800     if( ( buf[0x26] == 0x00 &&      // PCI
 801           buf[0x27] == 0x00 &&
 802           buf[0x28] == 0x01 &&
 803           buf[0x29] == 0xbf &&
 804           buf[0x2c] == 0x00 ) &&
 805         ( buf[0x400] == 0x00 &&     // DSI
 806           buf[0x401] == 0x00 &&
 807           buf[0x402] == 0x01 &&
 808           buf[0x403] == 0xbf &&
 809           buf[0x406] == 0x01 ) )
 810     {
 811         return ( 1 );
 812     } else {
 813         return ( 0 );
 814     }
 815 }
 816
 817
 818 /***********************************************************************
 819  * hb_dvdread_read
 820  ***********************************************************************
 821  *
 822  **********************************************************************/
 823 static int hb_dvdread_read( hb_dvd_t * e, hb_buffer_t * b )
 824 {
 825     hb_dvdread_t *d = &(e->dvdread);
 826  top:
 827     if( !d->pack_len )
 828     {
 829         /* New pack */
 830         dsi_t dsi_pack;
 831         int   error = 0;
 832
 833         // if we've just finished the last cell of the title we don't
 834         // want to read another block because our next_vobu pointer
 835         // is probably invalid. Just return 'no data' & our caller
 836         // should check and discover we're at eof.
 837         if ( d->cell_cur > d->cell_end )
 838             return 0;
 839
 840         for( ;; )
 841         {
 842             int block, pack_len, next_vobu, read_retry;
 843
 844             for( read_retry = 0; read_retry < 3; read_retry++ )
 845             {
 846                 if( DVDReadBlocks( d->file, d->next_vobu, 1, b->data ) == 1 )
 847                 {
 848                     /*
 849                      * Successful read.
 850                      */
 851                     break;
 852                 } else {
 853                     hb_log( "dvd: Read Error on blk %d, attempt %d",
 854                             d->next_vobu, read_retry );
 855                 }
 856             }
 857
 858             if( read_retry == 3 )
 859             {
 860                 hb_log( "dvd: vobu read error blk %d - skipping to cell %d",
 861                         d->next_vobu, d->cell_next );
 862                 d->cell_cur  = d->cell_next;
 863                 if ( d->cell_cur > d->cell_end )
 864                     return 0;
 865                 d->in_cell = 0;
 866                 d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
 867                 FindNextCell( d );
 868                 d->cell_overlap = 1;
 869                 continue;
 870             }
 871
 872             if ( !is_nav_pack( b->data ) ) {
 873                 (d->next_vobu)++;
 874                 if( d->in_sync == 1 ) {
 875                     hb_log("dvd: Lost sync, searching for NAV pack at blk %d",
 876                            d->next_vobu);
 877                     d->in_sync = 0;
 878                 }
 879                 continue;
 880             }
 881
 882             navRead_DSI( &dsi_pack, &b->data[DSI_START_BYTE] );
 883
 884             if ( d->in_sync == 0 && d->cur_cell_id &&
 885                  (d->cur_vob_id != dsi_pack.dsi_gi.vobu_vob_idn ||
 886                   d->cur_cell_id != dsi_pack.dsi_gi.vobu_c_idn ) )
 887             {
 888                 // We walked out of the cell we're supposed to be in.
 889                 // If we're not at the start of our next cell go there.
 890                 hb_log("dvd: left cell %d (%u,%u) for (%u,%u) at block %u",
 891                        d->cell_cur, d->cur_vob_id, d->cur_cell_id,
 892                        dsi_pack.dsi_gi.vobu_vob_idn, dsi_pack.dsi_gi.vobu_c_idn,
 893                        d->next_vobu );
 894                 if ( d->next_vobu != d->pgc->cell_playback[d->cell_next].first_sector )
 895                 {
 896                     d->next_vobu = d->pgc->cell_playback[d->cell_next].first_sector;
 897                     d->cur_cell_id = 0;
 898                     continue;
 899                 }
 900             }
 901
 902             block     = dsi_pack.dsi_gi.nv_pck_lbn;
 903             pack_len  = dsi_pack.dsi_gi.vobu_ea;
 904
 905             // There are a total of 21 next vobu offsets (and 21 prev_vobu
 906             // offsets) in the navpack SRI structure. The primary one is
 907             // 'next_vobu' which is the offset (in dvd blocks) from the current
 908             // block to the start of the next vobu. If the block at 'next_vobu'
 909             // can't be read, 'next_video' is the offset to the vobu closest to it.
 910             // The other 19 offsets are vobus at successively longer distances from
 911             // the current block (this is so that a hardware player can do
 912             // adaptive error recovery to skip over a bad spot on the disk). In all
 913             // these offsets the high bit is set to indicate when it contains a
 914             // valid offset. The next bit (2^30) is set to indicate that there's
 915             // another valid offset in the SRI that's closer to the current block.
 916             // A hardware player uses these bits to chose the closest valid offset
 917             // and uses that as its next vobu. (Some mastering schemes appear to
 918             // put a bogus offset in next_vobu with the 2^30 bit set & the
 919             // correct offset in next_video. This works fine in hardware players
 920             // but will mess up software that doesn't implement the full next
 921             // vobu decision logic.) In addition to the flag bits there's a
 922             // reserved value of the offset that indicates 'no next vobu' (which
 923             // indicates the end of a cell). But having no next vobu pointer with a
 924             // 'valid' bit set also indicates end of cell. Different mastering
 925             // schemes seem to use all possible combinations of the flag bits
 926             // and reserved values to indicate end of cell so we have to check
 927             // them all or we'll get a disk read error from following an
 928             // invalid offset.
 929             uint32_t next_ptr = dsi_pack.vobu_sri.next_vobu;
 930             if ( ( next_ptr & ( 1 << 31 ) ) == 0  ||
 931                  ( next_ptr & ( 1 << 30 ) ) != 0 ||
 932                  ( next_ptr & 0x3fffffff ) == 0x3fffffff )
 933             {
 934                 next_ptr = dsi_pack.vobu_sri.next_video;
 935                 if ( ( next_ptr & ( 1 << 31 ) ) == 0 ||
 936                      ( next_ptr & 0x3fffffff ) == 0x3fffffff )
 937                 {
 938                     // don't have a valid forward pointer - assume end-of-cell
 939                     d->block     = block;
 940                     d->pack_len  = pack_len;
 941                     break;
 942                 }
 943             }
 944             next_vobu = block + ( next_ptr & 0x3fffffff );
 945
 946             if( pack_len >  0    &&
 947                 pack_len <  1024 &&
 948                 block    >= d->next_vobu &&
 949                 ( block <= d->title_start + d->title_block_count ||
 950                   block <= d->title_end ) )
 951             {
 952                 d->block     = block;
 953                 d->pack_len  = pack_len;
 954                 d->next_vobu = next_vobu;
 955                 break;
 956             }
 957
 958             /* Wasn't a valid VOBU, try next block */
 959             if( ++error > 1024 )
 960             {
 961                 hb_log( "dvd: couldn't find a VOBU after 1024 blocks" );
 962                 return 0;
 963             }
 964
 965             (d->next_vobu)++;
 966         }
 967
 968         if( d->in_sync == 0 || d->in_sync == 2 )
 969         {
 970             if( d->in_sync == 0 )
 971             {
 972                 hb_log( "dvd: In sync with DVD at block %d", d->block );
 973             }
 974             d->in_sync = 1;
 975         }
 976
 977         // Revert the cell overlap, and check for a chapter break
 978         // If this cell is zero length (prev_vobu & next_vobu both
 979         // set to END_OF_CELL) we need to check for beginning of
 980         // cell before checking for end or we'll advance to the next
 981         // cell too early and fail to generate a chapter mark when this
 982         // cell starts a chapter.
 983         if( ( dsi_pack.vobu_sri.prev_vobu & (1 << 31 ) ) == 0 ||
 984             ( dsi_pack.vobu_sri.prev_vobu & 0x3fffffff ) == 0x3fffffff )
 985         {
 986             // A vobu that's not at the start of a cell can have an
 987             // EOC prev pointer (this seems to be associated with some
 988             // sort of drm). The rest of the content in the cell may be
 989             // booby-trapped so treat this like an end-of-cell rather
 990             // than a beginning of cell.
 991             if ( d->pgc->cell_playback[d->cell_cur].first_sector < dsi_pack.dsi_gi.nv_pck_lbn &&
 992                  d->pgc->cell_playback[d->cell_cur].last_sector >= dsi_pack.dsi_gi.nv_pck_lbn )
 993             {
 994                 hb_log( "dvd: null prev_vobu in cell %d at block %d", d->cell_cur,
 995                         d->block );
 996                 // treat like end-of-cell then go directly to start of next cell.
 997                 d->cell_cur  = d->cell_next;
 998                 d->in_cell = 0;
 999                 d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
1000                 FindNextCell( d );
1001                 d->cell_overlap = 1;
1002                 goto top;
1003             }
1004             else
1005             {
1006                 if ( d->block != d->pgc->cell_playback[d->cell_cur].first_sector )
1007                 {
1008                     hb_log( "dvd: beginning of cell %d at block %d", d->cell_cur,
1009                            d->block );
1010                 }
1011                 if( d->in_cell )
1012                 {
1013                     hb_error( "dvd: assuming missed end of cell %d", d->cell_cur );
1014                     d->cell_cur  = d->cell_next;
1015                     d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
1016                     FindNextCell( d );
1017                     d->cell_overlap = 1;
1018                     d->in_cell = 0;
1019                 } else {
1020                     d->in_cell = 1;
1021                 }
1022                 d->cur_vob_id = dsi_pack.dsi_gi.vobu_vob_idn;
1023                 d->cur_cell_id = dsi_pack.dsi_gi.vobu_c_idn;
1024
1025                 if( d->cell_overlap )
1026                 {
1027                     b->new_chap = hb_dvdread_is_break( d );
1028                     d->cell_overlap = 0;
1029                 }
1030             }
1031         }
1032
1033         if( ( dsi_pack.vobu_sri.next_vobu & (1 << 31 ) ) == 0 ||
1034             ( dsi_pack.vobu_sri.next_vobu & 0x3fffffff ) == 0x3fffffff )
1035         {
1036             if ( d->block <= d->pgc->cell_playback[d->cell_cur].first_sector ||
1037                  d->block > d->pgc->cell_playback[d->cell_cur].last_sector )
1038             {
1039                 hb_log( "dvd: end of cell %d at block %d", d->cell_cur,
1040                         d->block );
1041             }
1042             d->cell_cur  = d->cell_next;
1043             d->in_cell = 0;
1044             d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
1045             FindNextCell( d );
1046             d->cell_overlap = 1;
1047
1048         }
1049     }
1050     else
1051     {
1052         if( DVDReadBlocks( d->file, d->block, 1, b->data ) != 1 )
1053         {
1054             // this may be a real DVD error or may be DRM. Either way
1055             // we don't want to quit because of one bad block so set
1056             // things up so we'll advance to the next vobu and recurse.
1057             hb_error( "dvd: DVDReadBlocks failed (%d), skipping to vobu %u",
1058                       d->block, d->next_vobu );
1059             d->pack_len = 0;
1060             goto top;  /* XXX need to restructure this routine & avoid goto */
1061         }
1062         d->pack_len--;
1063     }
1064
1065     d->block++;
1066
1067     return 1;
1068 }
1069
1070 /***********************************************************************
1071  * hb_dvdread_chapter
1072  ***********************************************************************
1073  * Returns in which chapter the next block to be read is.
1074  * Chapter numbers start at 1.
1075  **********************************************************************/
1076 static int hb_dvdread_chapter( hb_dvd_t * e )
1077 {
1078     hb_dvdread_t *d = &(e->dvdread);
1079     int     i;
1080     int     pgc_id, pgn;
1081     int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
1082     pgc_t * pgc;
1083
1084     for( i = nr_of_ptts - 1;
1085          i >= 0;
1086          i-- )
1087     {
1088         /* Get pgc for chapter (i+1) */
1089         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
1090         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
1091         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
1092
1093         if( d->cell_cur - d->cell_overlap >= pgc->program_map[pgn-1] - 1 &&
1094             d->cell_cur - d->cell_overlap <= pgc->nr_of_cells - 1 )
1095         {
1096             /* We are in this chapter */
1097             return i + 1;
1098         }
1099     }
1100
1101     /* End of title */
1102     return -1;
1103 }
1104
1105 /***********************************************************************
1106  * hb_dvdread_is_break
1107  ***********************************************************************
1108  * Returns chapter number if the current block is a new chapter start
1109  **********************************************************************/
1110 static int hb_dvdread_is_break( hb_dvdread_t * d )
1111 {
1112     int     i;
1113     int     pgc_id, pgn;
1114     int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
1115     pgc_t * pgc;
1116     int     cell;
1117
1118     for( i = nr_of_ptts - 1;
1119          i > 0;
1120          i-- )
1121     {
1122         /* Get pgc for chapter (i+1) */
1123         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
1124         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
1125         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
1126         cell   = pgc->program_map[pgn-1] - 1;
1127
1128         if( cell <= d->cell_start )
1129             break;
1130
1131         // This must not match against the start cell.
1132         if( pgc->cell_playback[cell].first_sector == d->block && cell != d->cell_start )
1133         {
1134             return i + 1;
1135         }
1136     }
1137
1138     return 0;
1139 }
1140
1141 /***********************************************************************
1142  * hb_dvdread_close
1143  ***********************************************************************
1144  * Closes and frees everything
1145  **********************************************************************/
1146 static void hb_dvdread_close( hb_dvd_t ** _d )
1147 {
1148     hb_dvdread_t * d = &((*_d)->dvdread);
1149
1150     if( d->vmg )
1151     {
1152         ifoClose( d->vmg );
1153     }
1154     if( d->reader )
1155     {
1156         DVDClose( d->reader );
1157     }
1158
1159     free( d );
1160     *_d = NULL;
1161 }
1162
1163 /***********************************************************************
1164  * hb_dvdread_angle_count
1165  ***********************************************************************
1166  * Returns the number of angles supported.  We do not support angles
1167  * with dvdread
1168  **********************************************************************/
1169 static int hb_dvdread_angle_count( hb_dvd_t * d )
1170 {
1171     return 1;
1172 }
1173
1174 /***********************************************************************
1175  * hb_dvdread_set_angle
1176  ***********************************************************************
1177  * Sets the angle to read.  Not supported with dvdread
1178  **********************************************************************/
1179 static void hb_dvdread_set_angle( hb_dvd_t * d, int angle )
1180 {
1181 }
1182
1183 /***********************************************************************
1184  * FindNextCell
1185  ***********************************************************************
1186  * Assumes pgc and cell_cur are correctly set, and sets cell_next to the
1187  * cell to be read when we will be done with cell_cur.
1188  **********************************************************************/
1189 static void FindNextCell( hb_dvdread_t * d )
1190 {
1191     int i = 0;
1192
1193     if( d->pgc->cell_playback[d->cell_cur].block_type ==
1194             BLOCK_TYPE_ANGLE_BLOCK )
1195     {
1196
1197         while( d->pgc->cell_playback[d->cell_cur+i].block_mode !=
1198                    BLOCK_MODE_LAST_CELL )
1199         {
1200              i++;
1201         }
1202         d->cell_next = d->cell_cur + i + 1;
1203         hb_log( "dvd: Skipping multi-angle cells %d-%d",
1204                 d->cell_cur,
1205                 d->cell_next - 1 );
1206     }
1207     else
1208     {
1209         d->cell_next = d->cell_cur + 1;
1210     }
1211 }
1212
1213 /***********************************************************************
1214  * dvdtime2msec
1215  ***********************************************************************
1216  * From lsdvd
1217  **********************************************************************/
1218 static int dvdtime2msec(dvd_time_t * dt)
1219 {
1220     double frames_per_s[4] = {-1.0, 25.00, -1.0, 29.97};
1221     double fps = frames_per_s[(dt->frame_u & 0xc0) >> 6];
1222     long   ms;
1223     ms  = (((dt->hour &   0xf0) >> 3) * 5 + (dt->hour   & 0x0f)) * 3600000;
1224     ms += (((dt->minute & 0xf0) >> 3) * 5 + (dt->minute & 0x0f)) * 60000;
1225     ms += (((dt->second & 0xf0) >> 3) * 5 + (dt->second & 0x0f)) * 1000;
1226
1227     if( fps > 0 )
1228     {
1229         ms += ((dt->frame_u & 0x30) >> 3) * 5 +
1230               (dt->frame_u & 0x0f) * 1000.0 / fps;
1231     }
1232
1233     return ms;
1234 }
1235
1236 char * hb_dvd_name( char * path )
1237 {
1238     return dvd_methods->name(path);
1239 }
1240
1241 hb_dvd_t * hb_dvd_init( char * path )
1242 {
1243     return dvd_methods->init(path);
1244 }
1245
1246 int hb_dvd_title_count( hb_dvd_t * d )
1247 {
1248     return dvd_methods->title_count(d);
1249 }
1250
1251 hb_title_t * hb_dvd_title_scan( hb_dvd_t * d, int t )
1252 {
1253     return dvd_methods->title_scan(d, t);
1254 }
1255
1256 int hb_dvd_start( hb_dvd_t * d, hb_title_t *title, int chapter )
1257 {
1258     return dvd_methods->start(d, title, chapter);
1259 }
1260
1261 void hb_dvd_stop( hb_dvd_t * d )
1262 {
1263     dvd_methods->stop(d);
1264 }
1265
1266 int hb_dvd_seek( hb_dvd_t * d, float f )
1267 {
1268     return dvd_methods->seek(d, f);
1269 }
1270
1271 int hb_dvd_read( hb_dvd_t * d, hb_buffer_t * b )
1272 {
1273     return dvd_methods->read(d, b);
1274 }
1275
1276 int hb_dvd_chapter( hb_dvd_t * d )
1277 {
1278     return dvd_methods->chapter(d);
1279 }
1280
1281 void hb_dvd_close( hb_dvd_t ** _d )
1282 {
1283     dvd_methods->close(_d);
1284 }
1285
1286 int hb_dvd_angle_count( hb_dvd_t * d )
1287 {
1288     return dvd_methods->angle_count(d);
1289 }
1290
1291 void hb_dvd_set_angle( hb_dvd_t * d, int angle )
1292 {
1293     dvd_methods->set_angle(d, angle);
1294 }
1295
1296 // hb_dvd_set_dvdnav must only be called when no dvd source is open
1297 // it rips the rug out from under things so be careful
1298 void hb_dvd_set_dvdnav( int enable )
1299 {
1300     if (enable)
1301         dvd_methods = hb_dvdnav_methods();
1302     else
1303         dvd_methods = hb_dvdread_methods();
1304 }
1305