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     if( !hb_list_count( title->list_audio ) )
 425     {
 426         hb_log( "scan: ignoring title (no audio track)" );
 427         goto fail;
 428     }
 429
 430     memcpy( title->palette,
 431             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->palette,
 432             16 * sizeof( uint32_t ) );
 433
 434     /* Check for subtitles */
 435     for( i = 0; i < vts->vtsi_mat->nr_of_vts_subp_streams; i++ )
 436     {
 437         hb_subtitle_t * subtitle;
 438         int spu_control;
 439         int position;
 440         iso639_lang_t * lang;
 441         int lang_extension = 0;
 442
 443         hb_log( "scan: checking subtitle %d", i + 1 );
 444
 445         spu_control =
 446             vts->vts_pgcit->pgci_srp[pgc_id-1].pgc->subp_control[i];
 447
 448         if( !( spu_control & 0x80000000 ) )
 449         {
 450             hb_log( "scan: subtitle channel is not active" );
 451             continue;
 452         }
 453
 454         if( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 455         {
 456             switch( vts->vtsi_mat->vts_video_attr.permitted_df )
 457             {
 458                 case 1:
 459                     position = spu_control & 0xFF;
 460                     break;
 461                 case 2:
 462                     position = ( spu_control >> 8 ) & 0xFF;
 463                     break;
 464                 default:
 465                     position = ( spu_control >> 16 ) & 0xFF;
 466             }
 467         }
 468         else
 469         {
 470             position = ( spu_control >> 24 ) & 0x7F;
 471         }
 472
 473         lang_extension = vts->vtsi_mat->vts_subp_attr[i].code_extension;
 474
 475         lang = lang_for_code( vts->vtsi_mat->vts_subp_attr[i].lang_code );
 476
 477         subtitle = calloc( sizeof( hb_subtitle_t ), 1 );
 478         subtitle->track = i+1;
 479         subtitle->id = ( ( 0x20 + position ) << 8 ) | 0xbd;
 480         snprintf( subtitle->lang, sizeof( subtitle->lang ), "%s",
 481              strlen(lang->native_name) ? lang->native_name : lang->eng_name);
 482         snprintf( subtitle->iso639_2, sizeof( subtitle->iso639_2 ), "%s",
 483                   lang->iso639_2);
 484         subtitle->format = PICTURESUB;
 485         subtitle->source = VOBSUB;
 486         subtitle->config.dest   = RENDERSUB;  // By default render (burn-in) the VOBSUB.
 487
 488         subtitle->type = lang_extension;
 489
 490         switch( lang_extension )
 491         {
 492         case 0:
 493             break;
 494         case 1:
 495             break;
 496         case 2:
 497             strcat( subtitle->lang, " (Caption with bigger size character)");
 498             break;
 499         case 3:
 500             strcat( subtitle->lang, " (Caption for Children)");
 501             break;
 502         case 4:
 503             break;
 504         case 5:
 505             strcat( subtitle->lang, " (Closed Caption)");
 506             break;
 507         case 6:
 508             strcat( subtitle->lang, " (Closed Caption with bigger size character)");
 509             break;
 510         case 7:
 511             strcat( subtitle->lang, " (Closed Caption for Children)");
 512             break;
 513         case 8:
 514             break;
 515         case 9:
 516             strcat( subtitle->lang, " (Forced Caption)");
 517             break;
 518         case 10:
 519             break;
 520         case 11:
 521             break;
 522         case 12:
 523             break;
 524         case 13:
 525             strcat( subtitle->lang, " (Director's Commentary)");
 526             break;
 527         case 14:
 528             strcat( subtitle->lang, " (Director's Commentary with bigger size character)");
 529             break;
 530         case 15:
 531             strcat( subtitle->lang, " (Director's Commentary for Children)");
 532         default:
 533             break;
 534         }
 535
 536         hb_log( "scan: id=%x, lang=%s, 3cc=%s", subtitle->id,
 537                 subtitle->lang, subtitle->iso639_2 );
 538
 539         hb_list_add( title->list_subtitle, subtitle );
 540     }
 541
 542     /* Chapters */
 543     hb_log( "scan: title %d has %d chapters", t,
 544             vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts );
 545     for( i = 0, c = 1;
 546          i < vts->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts; i++ )
 547     {
 548         chapter = calloc( sizeof( hb_chapter_t ), 1 );
 549         /* remember the on-disc chapter number */
 550         chapter->index = i + 1;
 551
 552         pgc_id = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgcn;
 553         pgn    = vts->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgn;
 554         d->pgc = vts->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 555
 556         /* Start cell */
 557         chapter->cell_start  = d->pgc->program_map[pgn-1] - 1;
 558         chapter->block_start =
 559             d->pgc->cell_playback[chapter->cell_start].first_sector;
 560
 561         // if there are no more programs in this pgc, the end cell is the
 562         // last cell. Otherwise it's the cell before the start cell of the
 563         // next program.
 564         if ( pgn == d->pgc->nr_of_programs )
 565         {
 566             chapter->cell_end = d->pgc->nr_of_cells - 1;
 567         }
 568         else
 569         {
 570             chapter->cell_end = d->pgc->program_map[pgn] - 2;;
 571         }
 572         chapter->block_end = d->pgc->cell_playback[chapter->cell_end].last_sector;
 573
 574         /* Block count, duration */
 575         chapter->block_count = 0;
 576         chapter->duration = 0;
 577
 578         d->cell_cur = chapter->cell_start;
 579         while( d->cell_cur <= chapter->cell_end )
 580         {
 581 #define cp d->pgc->cell_playback[d->cell_cur]
 582             chapter->block_count += cp.last_sector + 1 - cp.first_sector;
 583             chapter->duration += 90LL * dvdtime2msec( &cp.playback_time );
 584 #undef cp
 585             FindNextCell( d );
 586             d->cell_cur = d->cell_next;
 587         }
 588         hb_list_add( title->list_chapter, chapter );
 589         c++;
 590     }
 591
 592     /* The durations we get for chapters aren't precise. Scale them so
 593        the total matches the title duration */
 594     duration = 0;
 595     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 596     {
 597         chapter = hb_list_item( title->list_chapter, i );
 598         duration += chapter->duration;
 599     }
 600     duration_correction = (float) title->duration / (float) duration;
 601     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 602     {
 603         int seconds;
 604         chapter            = hb_list_item( title->list_chapter, i );
 605         chapter->duration  = duration_correction * chapter->duration;
 606         seconds            = ( chapter->duration + 45000 ) / 90000;
 607         chapter->hours     = seconds / 3600;
 608         chapter->minutes   = ( seconds % 3600 ) / 60;
 609         chapter->seconds   = seconds % 60;
 610
 611         hb_log( "scan: chap %d c=%d->%d, b=%d->%d (%d), %"PRId64" ms",
 612                 chapter->index, chapter->cell_start, chapter->cell_end,
 613                 chapter->block_start, chapter->block_end,
 614                 chapter->block_count, chapter->duration / 90 );
 615     }
 616
 617     /* Get aspect. We don't get width/height/rate infos here as
 618        they tend to be wrong */
 619     switch( vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 620     {
 621         case 0:
 622             title->container_aspect = 4. / 3.;
 623             break;
 624         case 3:
 625             title->container_aspect = 16. / 9.;
 626             break;
 627         default:
 628             hb_log( "scan: unknown aspect" );
 629             goto fail;
 630     }
 631
 632     hb_log( "scan: aspect = %g", title->aspect );
 633
 634     /* This title is ok so far */
 635     goto cleanup;
 636
 637 fail:
 638     hb_list_close( &title->list_audio );
 639     free( title );
 640     title = NULL;
 641
 642 cleanup:
 643     if( vts ) ifoClose( vts );
 644
 645     return title;
 646 }
 647
 648 /***********************************************************************
 649  * hb_dvdread_start
 650  ***********************************************************************
 651  * Title and chapter start at 1
 652  **********************************************************************/
 653 static int hb_dvdread_start( hb_dvd_t * e, hb_title_t *title, int chapter )
 654 {
 655     hb_dvdread_t *d = &(e->dvdread);
 656     int pgc_id, pgn;
 657     int i;
 658     int t = title->index;
 659
 660     /* Open the IFO and the VOBs for this title */
 661     d->vts = d->vmg->tt_srpt->title[t-1].title_set_nr;
 662     d->ttn = d->vmg->tt_srpt->title[t-1].vts_ttn;
 663     if( !( d->ifo = ifoOpen( d->reader, d->vts ) ) )
 664     {
 665         hb_error( "dvd: ifoOpen failed for VTS %d", d->vts );
 666         return 0;
 667     }
 668     if( !( d->file = DVDOpenFile( d->reader, d->vts,
 669                                   DVD_READ_TITLE_VOBS ) ) )
 670     {
 671         hb_error( "dvd: DVDOpenFile failed for VTS %d", d->vts );
 672         return 0;
 673     }
 674
 675     /* Get title first and last blocks */
 676     pgc_id         = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgcn;
 677     pgn            = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[0].pgn;
 678     d->pgc         = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 679     d->cell_start  = d->pgc->program_map[pgn - 1] - 1;
 680     d->cell_end    = d->pgc->nr_of_cells - 1;
 681     d->title_start = d->pgc->cell_playback[d->cell_start].first_sector;
 682     d->title_end   = d->pgc->cell_playback[d->cell_end].last_sector;
 683
 684     /* Block count */
 685     d->title_block_count = 0;
 686     for( i = d->cell_start; i <= d->cell_end; i++ )
 687     {
 688         d->title_block_count += d->pgc->cell_playback[i].last_sector + 1 -
 689             d->pgc->cell_playback[i].first_sector;
 690     }
 691
 692     /* Get pgc for the current chapter */
 693     pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgcn;
 694     pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[chapter-1].pgn;
 695     d->pgc = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
 696
 697     /* Get the two first cells */
 698     d->cell_cur = d->pgc->program_map[pgn-1] - 1;
 699     FindNextCell( d );
 700
 701     d->block     = d->pgc->cell_playback[d->cell_cur].first_sector;
 702     d->next_vobu = d->block;
 703     d->pack_len  = 0;
 704     d->cell_overlap = 0;
 705     d->in_cell = 0;
 706     d->in_sync = 2;
 707
 708     return 1;
 709 }
 710
 711 /***********************************************************************
 712  * hb_dvdread_stop
 713  ***********************************************************************
 714  *
 715  **********************************************************************/
 716 static void hb_dvdread_stop( hb_dvd_t * e )
 717 {
 718     hb_dvdread_t *d = &(e->dvdread);
 719     if( d->ifo )
 720     {
 721         ifoClose( d->ifo );
 722         d->ifo = NULL;
 723     }
 724     if( d->file )
 725     {
 726         DVDCloseFile( d->file );
 727         d->file = NULL;
 728     }
 729 }
 730
 731 /***********************************************************************
 732  * hb_dvdread_seek
 733  ***********************************************************************
 734  *
 735  **********************************************************************/
 736 static int hb_dvdread_seek( hb_dvd_t * e, float f )
 737 {
 738     hb_dvdread_t *d = &(e->dvdread);
 739     int count, sizeCell;
 740     int i;
 741
 742     count = f * d->title_block_count;
 743
 744     for( i = d->cell_start; i <= d->cell_end; i++ )
 745     {
 746         sizeCell = d->pgc->cell_playback[i].last_sector + 1 -
 747             d->pgc->cell_playback[i].first_sector;
 748
 749         if( count < sizeCell )
 750         {
 751             d->cell_cur = i;
 752             d->cur_cell_id = 0;
 753             FindNextCell( d );
 754
 755             /* Now let hb_dvdread_read find the next VOBU */
 756             d->next_vobu = d->pgc->cell_playback[i].first_sector + count;
 757             d->pack_len  = 0;
 758             break;
 759         }
 760
 761         count -= sizeCell;
 762     }
 763
 764     if( i > d->cell_end )
 765     {
 766         return 0;
 767     }
 768
 769     /*
 770      * Assume that we are in sync, even if we are not given that it is obvious
 771      * that we are out of sync if we have just done a seek.
 772      */
 773     d->in_sync = 2;
 774
 775     return 1;
 776 }
 777
 778
 779 /***********************************************************************
 780  * is_nav_pack
 781  ***********************************************************************/
 782 int is_nav_pack( unsigned char *buf )
 783 {
 784     /*
 785      * The NAV Pack is comprised of the PCI Packet and DSI Packet, both
 786      * of these start at known offsets and start with a special identifier.
 787      *
 788      * NAV = {
 789      *  PCI = { 00 00 01 bf  # private stream header
 790      *          ?? ??        # length
 791      *          00           # substream
 792      *          ...
 793      *        }
 794      *  DSI = { 00 00 01 bf  # private stream header
 795      *          ?? ??        # length
 796      *          01           # substream
 797      *          ...
 798      *        }
 799      *
 800      * The PCI starts at offset 0x26 into the sector, and the DSI starts at 0x400
 801      *
 802      * This information from: http://dvd.sourceforge.net/dvdinfo/
 803      */
 804     if( ( buf[0x26] == 0x00 &&      // PCI
 805           buf[0x27] == 0x00 &&
 806           buf[0x28] == 0x01 &&
 807           buf[0x29] == 0xbf &&
 808           buf[0x2c] == 0x00 ) &&
 809         ( buf[0x400] == 0x00 &&     // DSI
 810           buf[0x401] == 0x00 &&
 811           buf[0x402] == 0x01 &&
 812           buf[0x403] == 0xbf &&
 813           buf[0x406] == 0x01 ) )
 814     {
 815         return ( 1 );
 816     } else {
 817         return ( 0 );
 818     }
 819 }
 820
 821
 822 /***********************************************************************
 823  * hb_dvdread_read
 824  ***********************************************************************
 825  *
 826  **********************************************************************/
 827 static int hb_dvdread_read( hb_dvd_t * e, hb_buffer_t * b )
 828 {
 829     hb_dvdread_t *d = &(e->dvdread);
 830  top:
 831     if( !d->pack_len )
 832     {
 833         /* New pack */
 834         dsi_t dsi_pack;
 835         int   error = 0;
 836
 837         // if we've just finished the last cell of the title we don't
 838         // want to read another block because our next_vobu pointer
 839         // is probably invalid. Just return 'no data' & our caller
 840         // should check and discover we're at eof.
 841         if ( d->cell_cur > d->cell_end )
 842             return 0;
 843
 844         for( ;; )
 845         {
 846             int block, pack_len, next_vobu, read_retry;
 847
 848             for( read_retry = 0; read_retry < 3; read_retry++ )
 849             {
 850                 if( DVDReadBlocks( d->file, d->next_vobu, 1, b->data ) == 1 )
 851                 {
 852                     /*
 853                      * Successful read.
 854                      */
 855                     break;
 856                 } else {
 857                     hb_log( "dvd: Read Error on blk %d, attempt %d",
 858                             d->next_vobu, read_retry );
 859                 }
 860             }
 861
 862             if( read_retry == 3 )
 863             {
 864                 hb_log( "dvd: vobu read error blk %d - skipping to cell %d",
 865                         d->next_vobu, d->cell_next );
 866                 d->cell_cur  = d->cell_next;
 867                 if ( d->cell_cur > d->cell_end )
 868                     return 0;
 869                 d->in_cell = 0;
 870                 d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
 871                 FindNextCell( d );
 872                 d->cell_overlap = 1;
 873                 continue;
 874             }
 875
 876             if ( !is_nav_pack( b->data ) ) {
 877                 (d->next_vobu)++;
 878                 if( d->in_sync == 1 ) {
 879                     hb_log("dvd: Lost sync, searching for NAV pack at blk %d",
 880                            d->next_vobu);
 881                     d->in_sync = 0;
 882                 }
 883                 continue;
 884             }
 885
 886             navRead_DSI( &dsi_pack, &b->data[DSI_START_BYTE] );
 887
 888             if ( d->in_sync == 0 && d->cur_cell_id &&
 889                  (d->cur_vob_id != dsi_pack.dsi_gi.vobu_vob_idn ||
 890                   d->cur_cell_id != dsi_pack.dsi_gi.vobu_c_idn ) )
 891             {
 892                 // We walked out of the cell we're supposed to be in.
 893                 // If we're not at the start of our next cell go there.
 894                 hb_log("dvd: left cell %d (%u,%u) for (%u,%u) at block %u",
 895                        d->cell_cur, d->cur_vob_id, d->cur_cell_id,
 896                        dsi_pack.dsi_gi.vobu_vob_idn, dsi_pack.dsi_gi.vobu_c_idn,
 897                        d->next_vobu );
 898                 if ( d->next_vobu != d->pgc->cell_playback[d->cell_next].first_sector )
 899                 {
 900                     d->next_vobu = d->pgc->cell_playback[d->cell_next].first_sector;
 901                     d->cur_cell_id = 0;
 902                     continue;
 903                 }
 904             }
 905
 906             block     = dsi_pack.dsi_gi.nv_pck_lbn;
 907             pack_len  = dsi_pack.dsi_gi.vobu_ea;
 908
 909             // There are a total of 21 next vobu offsets (and 21 prev_vobu
 910             // offsets) in the navpack SRI structure. The primary one is
 911             // 'next_vobu' which is the offset (in dvd blocks) from the current
 912             // block to the start of the next vobu. If the block at 'next_vobu'
 913             // can't be read, 'next_video' is the offset to the vobu closest to it.
 914             // The other 19 offsets are vobus at successively longer distances from
 915             // the current block (this is so that a hardware player can do
 916             // adaptive error recovery to skip over a bad spot on the disk). In all
 917             // these offsets the high bit is set to indicate when it contains a
 918             // valid offset. The next bit (2^30) is set to indicate that there's
 919             // another valid offset in the SRI that's closer to the current block.
 920             // A hardware player uses these bits to chose the closest valid offset
 921             // and uses that as its next vobu. (Some mastering schemes appear to
 922             // put a bogus offset in next_vobu with the 2^30 bit set & the
 923             // correct offset in next_video. This works fine in hardware players
 924             // but will mess up software that doesn't implement the full next
 925             // vobu decision logic.) In addition to the flag bits there's a
 926             // reserved value of the offset that indicates 'no next vobu' (which
 927             // indicates the end of a cell). But having no next vobu pointer with a
 928             // 'valid' bit set also indicates end of cell. Different mastering
 929             // schemes seem to use all possible combinations of the flag bits
 930             // and reserved values to indicate end of cell so we have to check
 931             // them all or we'll get a disk read error from following an
 932             // invalid offset.
 933             uint32_t next_ptr = dsi_pack.vobu_sri.next_vobu;
 934             if ( ( next_ptr & ( 1 << 31 ) ) == 0  ||
 935                  ( next_ptr & ( 1 << 30 ) ) != 0 ||
 936                  ( next_ptr & 0x3fffffff ) == 0x3fffffff )
 937             {
 938                 next_ptr = dsi_pack.vobu_sri.next_video;
 939                 if ( ( next_ptr & ( 1 << 31 ) ) == 0 ||
 940                      ( next_ptr & 0x3fffffff ) == 0x3fffffff )
 941                 {
 942                     // don't have a valid forward pointer - assume end-of-cell
 943                     d->block     = block;
 944                     d->pack_len  = pack_len;
 945                     break;
 946                 }
 947             }
 948             next_vobu = block + ( next_ptr & 0x3fffffff );
 949
 950             if( pack_len >  0    &&
 951                 pack_len <  1024 &&
 952                 block    >= d->next_vobu &&
 953                 ( block <= d->title_start + d->title_block_count ||
 954                   block <= d->title_end ) )
 955             {
 956                 d->block     = block;
 957                 d->pack_len  = pack_len;
 958                 d->next_vobu = next_vobu;
 959                 break;
 960             }
 961
 962             /* Wasn't a valid VOBU, try next block */
 963             if( ++error > 1024 )
 964             {
 965                 hb_log( "dvd: couldn't find a VOBU after 1024 blocks" );
 966                 return 0;
 967             }
 968
 969             (d->next_vobu)++;
 970         }
 971
 972         if( d->in_sync == 0 || d->in_sync == 2 )
 973         {
 974             if( d->in_sync == 0 )
 975             {
 976                 hb_log( "dvd: In sync with DVD at block %d", d->block );
 977             }
 978             d->in_sync = 1;
 979         }
 980
 981         // Revert the cell overlap, and check for a chapter break
 982         // If this cell is zero length (prev_vobu & next_vobu both
 983         // set to END_OF_CELL) we need to check for beginning of
 984         // cell before checking for end or we'll advance to the next
 985         // cell too early and fail to generate a chapter mark when this
 986         // cell starts a chapter.
 987         if( ( dsi_pack.vobu_sri.prev_vobu & (1 << 31 ) ) == 0 ||
 988             ( dsi_pack.vobu_sri.prev_vobu & 0x3fffffff ) == 0x3fffffff )
 989         {
 990             // A vobu that's not at the start of a cell can have an
 991             // EOC prev pointer (this seems to be associated with some
 992             // sort of drm). The rest of the content in the cell may be
 993             // booby-trapped so treat this like an end-of-cell rather
 994             // than a beginning of cell.
 995             if ( d->pgc->cell_playback[d->cell_cur].first_sector < dsi_pack.dsi_gi.nv_pck_lbn &&
 996                  d->pgc->cell_playback[d->cell_cur].last_sector >= dsi_pack.dsi_gi.nv_pck_lbn )
 997             {
 998                 hb_log( "dvd: null prev_vobu in cell %d at block %d", d->cell_cur,
 999                         d->block );
1000                 // treat like end-of-cell then go directly to start of next cell.
1001                 d->cell_cur  = d->cell_next;
1002                 d->in_cell = 0;
1003                 d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
1004                 FindNextCell( d );
1005                 d->cell_overlap = 1;
1006                 goto top;
1007             }
1008             else
1009             {
1010                 if ( d->block != d->pgc->cell_playback[d->cell_cur].first_sector )
1011                 {
1012                     hb_log( "dvd: beginning of cell %d at block %d", d->cell_cur,
1013                            d->block );
1014                 }
1015                 if( d->in_cell )
1016                 {
1017                     hb_error( "dvd: assuming missed end of cell %d", d->cell_cur );
1018                     d->cell_cur  = d->cell_next;
1019                     d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
1020                     FindNextCell( d );
1021                     d->cell_overlap = 1;
1022                     d->in_cell = 0;
1023                 } else {
1024                     d->in_cell = 1;
1025                 }
1026                 d->cur_vob_id = dsi_pack.dsi_gi.vobu_vob_idn;
1027                 d->cur_cell_id = dsi_pack.dsi_gi.vobu_c_idn;
1028
1029                 if( d->cell_overlap )
1030                 {
1031                     b->new_chap = hb_dvdread_is_break( d );
1032                     d->cell_overlap = 0;
1033                 }
1034             }
1035         }
1036
1037         if( ( dsi_pack.vobu_sri.next_vobu & (1 << 31 ) ) == 0 ||
1038             ( dsi_pack.vobu_sri.next_vobu & 0x3fffffff ) == 0x3fffffff )
1039         {
1040             if ( d->block <= d->pgc->cell_playback[d->cell_cur].first_sector ||
1041                  d->block > d->pgc->cell_playback[d->cell_cur].last_sector )
1042             {
1043                 hb_log( "dvd: end of cell %d at block %d", d->cell_cur,
1044                         d->block );
1045             }
1046             d->cell_cur  = d->cell_next;
1047             d->in_cell = 0;
1048             d->next_vobu = d->pgc->cell_playback[d->cell_cur].first_sector;
1049             FindNextCell( d );
1050             d->cell_overlap = 1;
1051
1052         }
1053     }
1054     else
1055     {
1056         if( DVDReadBlocks( d->file, d->block, 1, b->data ) != 1 )
1057         {
1058             // this may be a real DVD error or may be DRM. Either way
1059             // we don't want to quit because of one bad block so set
1060             // things up so we'll advance to the next vobu and recurse.
1061             hb_error( "dvd: DVDReadBlocks failed (%d), skipping to vobu %u",
1062                       d->block, d->next_vobu );
1063             d->pack_len = 0;
1064             goto top;  /* XXX need to restructure this routine & avoid goto */
1065         }
1066         d->pack_len--;
1067     }
1068
1069     d->block++;
1070
1071     return 1;
1072 }
1073
1074 /***********************************************************************
1075  * hb_dvdread_chapter
1076  ***********************************************************************
1077  * Returns in which chapter the next block to be read is.
1078  * Chapter numbers start at 1.
1079  **********************************************************************/
1080 static int hb_dvdread_chapter( hb_dvd_t * e )
1081 {
1082     hb_dvdread_t *d = &(e->dvdread);
1083     int     i;
1084     int     pgc_id, pgn;
1085     int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
1086     pgc_t * pgc;
1087
1088     for( i = nr_of_ptts - 1;
1089          i >= 0;
1090          i-- )
1091     {
1092         /* Get pgc for chapter (i+1) */
1093         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
1094         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
1095         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
1096
1097         if( d->cell_cur - d->cell_overlap >= pgc->program_map[pgn-1] - 1 &&
1098             d->cell_cur - d->cell_overlap <= pgc->nr_of_cells - 1 )
1099         {
1100             /* We are in this chapter */
1101             return i + 1;
1102         }
1103     }
1104
1105     /* End of title */
1106     return -1;
1107 }
1108
1109 /***********************************************************************
1110  * hb_dvdread_is_break
1111  ***********************************************************************
1112  * Returns chapter number if the current block is a new chapter start
1113  **********************************************************************/
1114 static int hb_dvdread_is_break( hb_dvdread_t * d )
1115 {
1116     int     i;
1117     int     pgc_id, pgn;
1118     int     nr_of_ptts = d->ifo->vts_ptt_srpt->title[d->ttn-1].nr_of_ptts;
1119     pgc_t * pgc;
1120     int     cell;
1121
1122     for( i = nr_of_ptts - 1;
1123          i > 0;
1124          i-- )
1125     {
1126         /* Get pgc for chapter (i+1) */
1127         pgc_id = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgcn;
1128         pgn    = d->ifo->vts_ptt_srpt->title[d->ttn-1].ptt[i].pgn;
1129         pgc    = d->ifo->vts_pgcit->pgci_srp[pgc_id-1].pgc;
1130         cell   = pgc->program_map[pgn-1] - 1;
1131
1132         if( cell <= d->cell_start )
1133             break;
1134
1135         // This must not match against the start cell.
1136         if( pgc->cell_playback[cell].first_sector == d->block && cell != d->cell_start )
1137         {
1138             return i + 1;
1139         }
1140     }
1141
1142     return 0;
1143 }
1144
1145 /***********************************************************************
1146  * hb_dvdread_close
1147  ***********************************************************************
1148  * Closes and frees everything
1149  **********************************************************************/
1150 static void hb_dvdread_close( hb_dvd_t ** _d )
1151 {
1152     hb_dvdread_t * d = &((*_d)->dvdread);
1153
1154     if( d->vmg )
1155     {
1156         ifoClose( d->vmg );
1157     }
1158     if( d->reader )
1159     {
1160         DVDClose( d->reader );
1161     }
1162
1163     free( d );
1164     *_d = NULL;
1165 }
1166
1167 /***********************************************************************
1168  * hb_dvdread_angle_count
1169  ***********************************************************************
1170  * Returns the number of angles supported.  We do not support angles
1171  * with dvdread
1172  **********************************************************************/
1173 static int hb_dvdread_angle_count( hb_dvd_t * d )
1174 {
1175     return 1;
1176 }
1177
1178 /***********************************************************************
1179  * hb_dvdread_set_angle
1180  ***********************************************************************
1181  * Sets the angle to read.  Not supported with dvdread
1182  **********************************************************************/
1183 static void hb_dvdread_set_angle( hb_dvd_t * d, int angle )
1184 {
1185 }
1186
1187 /***********************************************************************
1188  * FindNextCell
1189  ***********************************************************************
1190  * Assumes pgc and cell_cur are correctly set, and sets cell_next to the
1191  * cell to be read when we will be done with cell_cur.
1192  **********************************************************************/
1193 static void FindNextCell( hb_dvdread_t * d )
1194 {
1195     int i = 0;
1196
1197     if( d->pgc->cell_playback[d->cell_cur].block_type ==
1198             BLOCK_TYPE_ANGLE_BLOCK )
1199     {
1200
1201         while( d->pgc->cell_playback[d->cell_cur+i].block_mode !=
1202                    BLOCK_MODE_LAST_CELL )
1203         {
1204              i++;
1205         }
1206         d->cell_next = d->cell_cur + i + 1;
1207         hb_log( "dvd: Skipping multi-angle cells %d-%d",
1208                 d->cell_cur,
1209                 d->cell_next - 1 );
1210     }
1211     else
1212     {
1213         d->cell_next = d->cell_cur + 1;
1214     }
1215 }
1216
1217 /***********************************************************************
1218  * dvdtime2msec
1219  ***********************************************************************
1220  * From lsdvd
1221  **********************************************************************/
1222 static int dvdtime2msec(dvd_time_t * dt)
1223 {
1224     double frames_per_s[4] = {-1.0, 25.00, -1.0, 29.97};
1225     double fps = frames_per_s[(dt->frame_u & 0xc0) >> 6];
1226     long   ms;
1227     ms  = (((dt->hour &   0xf0) >> 3) * 5 + (dt->hour   & 0x0f)) * 3600000;
1228     ms += (((dt->minute & 0xf0) >> 3) * 5 + (dt->minute & 0x0f)) * 60000;
1229     ms += (((dt->second & 0xf0) >> 3) * 5 + (dt->second & 0x0f)) * 1000;
1230
1231     if( fps > 0 )
1232     {
1233         ms += ((dt->frame_u & 0x30) >> 3) * 5 +
1234               (dt->frame_u & 0x0f) * 1000.0 / fps;
1235     }
1236
1237     return ms;
1238 }
1239
1240 char * hb_dvd_name( char * path )
1241 {
1242     return dvd_methods->name(path);
1243 }
1244
1245 hb_dvd_t * hb_dvd_init( char * path )
1246 {
1247     return dvd_methods->init(path);
1248 }
1249
1250 int hb_dvd_title_count( hb_dvd_t * d )
1251 {
1252     return dvd_methods->title_count(d);
1253 }
1254
1255 hb_title_t * hb_dvd_title_scan( hb_dvd_t * d, int t )
1256 {
1257     return dvd_methods->title_scan(d, t);
1258 }
1259
1260 int hb_dvd_start( hb_dvd_t * d, hb_title_t *title, int chapter )
1261 {
1262     return dvd_methods->start(d, title, chapter);
1263 }
1264
1265 void hb_dvd_stop( hb_dvd_t * d )
1266 {
1267     dvd_methods->stop(d);
1268 }
1269
1270 int hb_dvd_seek( hb_dvd_t * d, float f )
1271 {
1272     return dvd_methods->seek(d, f);
1273 }
1274
1275 int hb_dvd_read( hb_dvd_t * d, hb_buffer_t * b )
1276 {
1277     return dvd_methods->read(d, b);
1278 }
1279
1280 int hb_dvd_chapter( hb_dvd_t * d )
1281 {
1282     return dvd_methods->chapter(d);
1283 }
1284
1285 void hb_dvd_close( hb_dvd_t ** _d )
1286 {
1287     dvd_methods->close(_d);
1288 }
1289
1290 int hb_dvd_angle_count( hb_dvd_t * d )
1291 {
1292     return dvd_methods->angle_count(d);
1293 }
1294
1295 void hb_dvd_set_angle( hb_dvd_t * d, int angle )
1296 {
1297     dvd_methods->set_angle(d, angle);
1298 }
1299
1300 // hb_dvd_set_dvdnav must only be called when no dvd source is open
1301 // it rips the rug out from under things so be careful
1302 void hb_dvd_set_dvdnav( int enable )
1303 {
1304     if (enable)
1305         dvd_methods = hb_dvdnav_methods();
1306     else
1307         dvd_methods = hb_dvdread_methods();
1308 }
1309