libhb/dvdnav.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 "dvdnav/dvdnav.h"
  12 #include "dvdread/ifo_read.h"
  13 #include "dvdread/ifo_print.h"
  14 #include "dvdread/nav_read.h"
  15
  16 #define DVD_READ_CACHE 1
  17
  18 static char        * hb_dvdnav_name( char * path );
  19 static hb_dvd_t    * hb_dvdnav_init( char * path );
  20 static int           hb_dvdnav_title_count( hb_dvd_t * d );
  21 static hb_title_t  * hb_dvdnav_title_scan( hb_dvd_t * d, int t );
  22 static int           hb_dvdnav_start( hb_dvd_t * d, hb_title_t *title, int chapter );
  23 static void          hb_dvdnav_stop( hb_dvd_t * d );
  24 static int           hb_dvdnav_seek( hb_dvd_t * d, float f );
  25 static int           hb_dvdnav_read( hb_dvd_t * d, hb_buffer_t * b );
  26 static int           hb_dvdnav_chapter( hb_dvd_t * d );
  27 static void          hb_dvdnav_close( hb_dvd_t ** _d );
  28 static int           hb_dvdnav_angle_count( hb_dvd_t * d );
  29 static void          hb_dvdnav_set_angle( hb_dvd_t * e, int angle );
  30
  31 hb_dvd_func_t hb_dvdnav_func =
  32 {
  33     hb_dvdnav_init,
  34     hb_dvdnav_close,
  35     hb_dvdnav_name,
  36     hb_dvdnav_title_count,
  37     hb_dvdnav_title_scan,
  38     hb_dvdnav_start,
  39     hb_dvdnav_stop,
  40     hb_dvdnav_seek,
  41     hb_dvdnav_read,
  42     hb_dvdnav_chapter,
  43     hb_dvdnav_angle_count,
  44     hb_dvdnav_set_angle
  45 };
  46
  47 // there can be at most 999 PGCs per title. round that up to the nearest
  48 // power of two.
  49 #define MAX_PGCN 1024
  50
  51 /***********************************************************************
  52  * Local prototypes
  53  **********************************************************************/
  54 static void PgcWalkInit( uint32_t pgcn_map[MAX_PGCN/32] );
  55 static int FindChapterIndex( hb_list_t * list, int pgcn, int pgn );
  56 static int NextPgcn( ifo_handle_t *ifo, int pgcn, uint32_t pgcn_map[MAX_PGCN/32] );
  57 static int FindNextCell( pgc_t *pgc, int cell_cur );
  58 static int dvdtime2msec( dvd_time_t * );
  59
  60 hb_dvd_func_t * hb_dvdnav_methods( void )
  61 {
  62     return &hb_dvdnav_func;
  63 }
  64
  65 static char * hb_dvdnav_name( char * path )
  66 {
  67     static char name[1024];
  68     unsigned char unused[1024];
  69     dvd_reader_t * reader;
  70
  71     reader = DVDOpen( path );
  72     if( !reader )
  73     {
  74         return NULL;
  75     }
  76
  77     if( DVDUDFVolumeInfo( reader, name, sizeof( name ),
  78                           unused, sizeof( unused ) ) )
  79     {
  80         DVDClose( reader );
  81         return NULL;
  82     }
  83
  84     DVDClose( reader );
  85     return name;
  86 }
  87
  88 /***********************************************************************
  89  * hb_dvdnav_reset
  90  ***********************************************************************
  91  * Once dvdnav has entered the 'stopped' state, it can not be revived
  92  * dvdnav_reset doesn't work because it doesn't remember the path
  93  * So this function re-opens dvdnav
  94  **********************************************************************/
  95 static int hb_dvdnav_reset( hb_dvdnav_t * d )
  96 {
  97     if ( d->dvdnav )
  98         dvdnav_close( d->dvdnav );
  99
 100     /* Open device */
 101     if( dvdnav_open(&d->dvdnav, d->path) != DVDNAV_STATUS_OK )
 102     {
 103         /*
 104          * Not an error, may be a stream - which we'll try in a moment.
 105          */
 106         hb_log( "dvd: not a dvd - trying as a stream/file instead" );
 107         goto fail;
 108     }
 109
 110     if (dvdnav_set_readahead_flag(d->dvdnav, DVD_READ_CACHE) !=
 111         DVDNAV_STATUS_OK)
 112     {
 113         hb_error("Error: dvdnav_set_readahead_flag: %s\n",
 114                  dvdnav_err_to_string(d->dvdnav));
 115         goto fail;
 116     }
 117
 118     /*
 119      ** set the PGC positioning flag to have position information
 120      ** relatively to the whole feature instead of just relatively to the
 121      ** current chapter
 122      **/
 123     if (dvdnav_set_PGC_positioning_flag(d->dvdnav, 1) != DVDNAV_STATUS_OK)
 124     {
 125         hb_error("Error: dvdnav_set_PGC_positioning_flag: %s\n",
 126                  dvdnav_err_to_string(d->dvdnav));
 127         goto fail;
 128     }
 129     return 1;
 130
 131 fail:
 132     if( d->dvdnav ) dvdnav_close( d->dvdnav );
 133     return 0;
 134 }
 135
 136 /***********************************************************************
 137  * hb_dvdnav_init
 138  ***********************************************************************
 139  *
 140  **********************************************************************/
 141 static hb_dvd_t * hb_dvdnav_init( char * path )
 142 {
 143     hb_dvd_t * e;
 144     hb_dvdnav_t * d;
 145     int region_mask;
 146
 147     e = calloc( sizeof( hb_dvd_t ), 1 );
 148     d = &(e->dvdnav);
 149
 150         /* Log DVD drive region code */
 151     if ( hb_dvd_region( path, &region_mask ) == 0 )
 152     {
 153         hb_log( "dvd: Region mask 0x%02x", region_mask );
 154         if ( region_mask == 0xFF )
 155         {
 156             hb_log( "dvd: Warning, DVD device has no region set" );
 157         }
 158     }
 159
 160     /* Open device */
 161     if( dvdnav_open(&d->dvdnav, path) != DVDNAV_STATUS_OK )
 162     {
 163         /*
 164          * Not an error, may be a stream - which we'll try in a moment.
 165          */
 166         hb_log( "dvd: not a dvd - trying as a stream/file instead" );
 167         goto fail;
 168     }
 169
 170     if (dvdnav_set_readahead_flag(d->dvdnav, DVD_READ_CACHE) !=
 171         DVDNAV_STATUS_OK)
 172     {
 173         hb_error("Error: dvdnav_set_readahead_flag: %s\n",
 174                  dvdnav_err_to_string(d->dvdnav));
 175         goto fail;
 176     }
 177
 178     /*
 179      ** set the PGC positioning flag to have position information
 180      ** relatively to the whole feature instead of just relatively to the
 181      ** current chapter
 182      **/
 183     if (dvdnav_set_PGC_positioning_flag(d->dvdnav, 1) != DVDNAV_STATUS_OK)
 184     {
 185         hb_error("Error: dvdnav_set_PGC_positioning_flag: %s\n",
 186                  dvdnav_err_to_string(d->dvdnav));
 187         goto fail;
 188     }
 189
 190     /* Open device */
 191     if( !( d->reader = DVDOpen( path ) ) )
 192     {
 193         /*
 194          * Not an error, may be a stream - which we'll try in a moment.
 195          */
 196         hb_log( "dvd: not a dvd - trying as a stream/file instead" );
 197         goto fail;
 198     }
 199
 200     /* Open main IFO */
 201     if( !( d->vmg = ifoOpen( d->reader, 0 ) ) )
 202     {
 203         hb_error( "dvd: ifoOpen failed" );
 204         goto fail;
 205     }
 206
 207     d->path = strdup( path );
 208
 209     return e;
 210
 211 fail:
 212     if( d->dvdnav ) dvdnav_close( d->dvdnav );
 213     if( d->vmg )    ifoClose( d->vmg );
 214     if( d->reader ) DVDClose( d->reader );
 215     free( e );
 216     return NULL;
 217 }
 218
 219 /***********************************************************************
 220  * hb_dvdnav_title_count
 221  **********************************************************************/
 222 static int hb_dvdnav_title_count( hb_dvd_t * e )
 223 {
 224     int titles = 0;
 225     hb_dvdnav_t * d = &(e->dvdnav);
 226
 227     dvdnav_get_number_of_titles(d->dvdnav, &titles);
 228     return titles;
 229 }
 230
 231 static uint64_t
 232 PttDuration(ifo_handle_t *ifo, int ttn, int pttn, int *blocks, int *last_pgcn)
 233 {
 234     int            pgcn, pgn;
 235     pgc_t        * pgc;
 236     uint64_t       duration = 0;
 237     int            cell_start, cell_end;
 238     int            i;
 239
 240     // Initialize map of visited pgc's to prevent loops
 241     uint32_t pgcn_map[MAX_PGCN/32];
 242     PgcWalkInit( pgcn_map );
 243     pgcn   = ifo->vts_ptt_srpt->title[ttn-1].ptt[pttn-1].pgcn;
 244     pgn   = ifo->vts_ptt_srpt->title[ttn-1].ptt[pttn-1].pgn;
 245     if ( pgcn < 1 || pgcn > ifo->vts_pgcit->nr_of_pgci_srp || pgcn >= MAX_PGCN)
 246     {
 247         hb_error( "invalid PGC ID %d, skipping", pgcn );
 248         return 0;
 249     }
 250
 251     if( pgn <= 0 || pgn > 99 )
 252     {
 253         hb_error( "scan: pgn %d not valid, skipping", pgn );
 254         return 0;
 255     }
 256
 257     *blocks = 0;
 258     do
 259     {
 260         pgc = ifo->vts_pgcit->pgci_srp[pgcn-1].pgc;
 261         if (!pgc)
 262         {
 263             hb_error( "scan: pgc not valid, skipping" );
 264             break;
 265         }
 266         if (pgn > pgc->nr_of_programs)
 267         {
 268             pgn = 1;
 269             continue;
 270         }
 271
 272         duration += 90LL * dvdtime2msec( &pgc->playback_time );
 273
 274         cell_start = pgc->program_map[pgn-1] - 1;
 275         cell_end = pgc->nr_of_cells - 1;
 276         for(i = cell_start; i <= cell_end; i = FindNextCell(pgc, i))
 277         {
 278             *blocks += pgc->cell_playback[i].last_sector + 1 -
 279                 pgc->cell_playback[i].first_sector;
 280         }
 281         *last_pgcn = pgcn;
 282         pgn = 1;
 283     } while((pgcn = NextPgcn(ifo, pgcn, pgcn_map)) != 0);
 284     return duration;
 285 }
 286
 287 /***********************************************************************
 288  * hb_dvdnav_title_scan
 289  **********************************************************************/
 290 static hb_title_t * hb_dvdnav_title_scan( hb_dvd_t * e, int t )
 291 {
 292
 293     hb_dvdnav_t * d = &(e->dvdnav);
 294     hb_title_t   * title;
 295     ifo_handle_t * ifo = NULL;
 296     int            pgcn, pgn, pgcn_end, i, c;
 297     int            title_pgcn;
 298     pgc_t        * pgc;
 299     int            cell_cur;
 300     hb_chapter_t * chapter;
 301     int            count;
 302     uint64_t       duration, longest;
 303     int            longest_pgcn, longest_pgn, longest_pgcn_end;
 304     float          duration_correction;
 305     const char   * name;
 306
 307     hb_log( "scan: scanning title %d", t );
 308
 309     title = hb_title_init( d->path, t );
 310     if (dvdnav_get_title_string(d->dvdnav, &name) == DVDNAV_STATUS_OK)
 311     {
 312         strncpy( title->name, name, sizeof( title->name ) );
 313     }
 314     else
 315     {
 316         char * p_cur, * p_last = d->path;
 317         for( p_cur = d->path; *p_cur; p_cur++ )
 318         {
 319             if( p_cur[0] == '/' && p_cur[1] )
 320             {
 321                 p_last = &p_cur[1];
 322             }
 323         }
 324         snprintf( title->name, sizeof( title->name ), "%s", p_last );
 325     }
 326
 327     /* VTS which our title is in */
 328     title->vts = d->vmg->tt_srpt->title[t-1].title_set_nr;
 329
 330     if ( !title->vts )
 331     {
 332         /* A VTS of 0 means the title wasn't found in the title set */
 333         hb_error("Invalid VTS (title set) number: %i", title->vts);
 334         goto fail;
 335     }
 336
 337     hb_log( "scan: opening IFO for VTS %d", title->vts );
 338     if( !( ifo = ifoOpen( d->reader, title->vts ) ) )
 339     {
 340         hb_error( "scan: ifoOpen failed" );
 341         goto fail;
 342     }
 343
 344     /* ignore titles with bogus cell addresses so we don't abort later
 345      ** in libdvdread. */
 346     for ( i = 0; i < ifo->vts_c_adt->nr_of_vobs; ++i)
 347     {
 348         if( (ifo->vts_c_adt->cell_adr_table[i].start_sector & 0xffffff ) ==
 349             0xffffff )
 350         {
 351             hb_error( "scan: cell_adr_table[%d].start_sector invalid (0x%x) "
 352                       "- skipping title", i,
 353                       ifo->vts_c_adt->cell_adr_table[i].start_sector );
 354             goto fail;
 355         }
 356         if( (ifo->vts_c_adt->cell_adr_table[i].last_sector & 0xffffff ) ==
 357             0xffffff )
 358         {
 359             hb_error( "scan: cell_adr_table[%d].last_sector invalid (0x%x) "
 360                       "- skipping title", i,
 361                       ifo->vts_c_adt->cell_adr_table[i].last_sector );
 362             goto fail;
 363         }
 364         if( ifo->vts_c_adt->cell_adr_table[i].start_sector >=
 365             ifo->vts_c_adt->cell_adr_table[i].last_sector )
 366         {
 367             hb_error( "scan: cell_adr_table[%d].start_sector (0x%x) "
 368                       "is not before last_sector (0x%x) - skipping title", i,
 369                       ifo->vts_c_adt->cell_adr_table[i].start_sector,
 370                       ifo->vts_c_adt->cell_adr_table[i].last_sector );
 371             goto fail;
 372         }
 373     }
 374
 375     if( global_verbosity_level == 3 )
 376     {
 377         ifo_print( d->reader, title->vts );
 378     }
 379
 380     /* Position of the title in the VTS */
 381     title->ttn = d->vmg->tt_srpt->title[t-1].vts_ttn;
 382     if ( title->ttn < 1 || title->ttn > ifo->vts_ptt_srpt->nr_of_srpts )
 383     {
 384         hb_error( "invalid VTS PTT offset %d for title %d, skipping", title->ttn, t );
 385         goto fail;
 386     }
 387
 388     longest = 0LL;
 389     longest_pgcn = -1;
 390     longest_pgn = 1;
 391     longest_pgcn_end = -1;
 392     pgcn_end = -1;
 393     for( i = 0; i < ifo->vts_ptt_srpt->title[title->ttn-1].nr_of_ptts; i++ )
 394     {
 395         int blocks = 0;
 396
 397         duration = PttDuration(ifo, title->ttn, i+1, &blocks, &pgcn_end);
 398         pgcn  = ifo->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgcn;
 399         pgn   = ifo->vts_ptt_srpt->title[title->ttn-1].ptt[i].pgn;
 400         if( duration > longest )
 401         {
 402             longest_pgcn  = pgcn;
 403             longest_pgn   = pgn;
 404             longest_pgcn_end   = pgcn_end;
 405             longest = duration;
 406             title->block_count = blocks;
 407         }
 408         else if (pgcn == longest_pgcn && pgn < longest_pgn)
 409         {
 410             longest_pgn   = pgn;
 411             title->block_count = blocks;
 412         }
 413     }
 414
 415     /* ignore titles under 10 seconds because they're often stills or
 416      * clips with no audio & our preview code doesn't currently handle
 417      * either of these. */
 418     if( longest < 900000LL )
 419     {
 420         hb_log( "scan: ignoring title (too short)" );
 421         goto fail;
 422     }
 423
 424     pgcn       = longest_pgcn;
 425     pgcn_end   = longest_pgcn_end;
 426     pgn        = longest_pgn;;
 427     title_pgcn = pgcn;
 428
 429
 430     /* Get pgc */
 431     if ( pgcn < 1 || pgcn > ifo->vts_pgcit->nr_of_pgci_srp || pgcn >= MAX_PGCN)
 432     {
 433         hb_error( "invalid PGC ID %d for title %d, skipping", pgcn, t );
 434         goto fail;
 435     }
 436
 437     pgc = ifo->vts_pgcit->pgci_srp[pgcn-1].pgc;
 438
 439     hb_log("pgc_id: %d, pgn: %d: pgc: %p", pgcn, pgn, pgc);
 440     if (pgn > pgc->nr_of_programs)
 441     {
 442         hb_error( "invalid PGN %d for title %d, skipping", pgn, t );
 443         goto fail;
 444     }
 445
 446     /* Title start */
 447     title->cell_start = pgc->program_map[pgn-1] - 1;
 448     title->block_start = pgc->cell_playback[title->cell_start].first_sector;
 449
 450     pgc = ifo->vts_pgcit->pgci_srp[pgcn_end-1].pgc;
 451
 452     /* Title end */
 453     title->cell_end = pgc->nr_of_cells - 1;
 454     title->block_end = pgc->cell_playback[title->cell_end].last_sector;
 455
 456     hb_log( "scan: vts=%d, ttn=%d, cells=%d->%d, blocks=%d->%d, "
 457             "%d blocks", title->vts, title->ttn, title->cell_start,
 458             title->cell_end, title->block_start, title->block_end,
 459             title->block_count );
 460
 461     /* Get duration */
 462     title->duration = longest;
 463     title->hours    = title->duration / 90000 / 3600;
 464     title->minutes  = ( ( title->duration / 90000 ) % 3600 ) / 60;
 465     title->seconds  = ( title->duration / 90000 ) % 60;
 466     hb_log( "scan: duration is %02d:%02d:%02d (%"PRId64" ms)",
 467             title->hours, title->minutes, title->seconds,
 468             title->duration / 90 );
 469
 470     /* Detect languages */
 471     for( i = 0; i < ifo->vtsi_mat->nr_of_vts_audio_streams; i++ )
 472     {
 473         hb_audio_t * audio, * audio_tmp;
 474         int          audio_format, lang_code, audio_control,
 475                      position, j;
 476         iso639_lang_t * lang;
 477         int lang_extension = 0;
 478
 479         hb_log( "scan: checking audio %d", i + 1 );
 480
 481         audio = calloc( sizeof( hb_audio_t ), 1 );
 482
 483         audio_format  = ifo->vtsi_mat->vts_audio_attr[i].audio_format;
 484         lang_code     = ifo->vtsi_mat->vts_audio_attr[i].lang_code;
 485         lang_extension = ifo->vtsi_mat->vts_audio_attr[i].code_extension;
 486         audio_control =
 487             ifo->vts_pgcit->pgci_srp[title_pgcn-1].pgc->audio_control[i];
 488
 489         if( !( audio_control & 0x8000 ) )
 490         {
 491             hb_log( "scan: audio channel is not active" );
 492             free( audio );
 493             continue;
 494         }
 495
 496         position = ( audio_control & 0x7F00 ) >> 8;
 497
 498         switch( audio_format )
 499         {
 500             case 0x00:
 501                 audio->id    = ( ( 0x80 + position ) << 8 ) | 0xbd;
 502                 audio->config.in.codec = HB_ACODEC_AC3;
 503                 break;
 504
 505             case 0x02:
 506             case 0x03:
 507                 audio->id    = 0xc0 + position;
 508                 audio->config.in.codec = HB_ACODEC_MPGA;
 509                 break;
 510
 511             case 0x04:
 512                 audio->id    = ( ( 0xa0 + position ) << 8 ) | 0xbd;
 513                 audio->config.in.codec = HB_ACODEC_LPCM;
 514                 break;
 515
 516             case 0x06:
 517                 audio->id    = ( ( 0x88 + position ) << 8 ) | 0xbd;
 518                 audio->config.in.codec = HB_ACODEC_DCA;
 519                 break;
 520
 521             default:
 522                 audio->id    = 0;
 523                 audio->config.in.codec = 0;
 524                 hb_log( "scan: unknown audio codec (%x)",
 525                         audio_format );
 526                 break;
 527         }
 528         if( !audio->id )
 529         {
 530             continue;
 531         }
 532
 533         /* Check for duplicate tracks */
 534         audio_tmp = NULL;
 535         for( j = 0; j < hb_list_count( title->list_audio ); j++ )
 536         {
 537             audio_tmp = hb_list_item( title->list_audio, j );
 538             if( audio->id == audio_tmp->id )
 539             {
 540                 break;
 541             }
 542             audio_tmp = NULL;
 543         }
 544         if( audio_tmp )
 545         {
 546             hb_log( "scan: duplicate audio track" );
 547             free( audio );
 548             continue;
 549         }
 550
 551         audio->config.lang.type = lang_extension;
 552
 553         lang = lang_for_code( ifo->vtsi_mat->vts_audio_attr[i].lang_code );
 554
 555         snprintf( audio->config.lang.description, sizeof( audio->config.lang.description ), "%s (%s)",
 556             strlen(lang->native_name) ? lang->native_name : lang->eng_name,
 557             audio->config.in.codec == HB_ACODEC_AC3 ? "AC3" : ( audio->config.in.codec ==
 558                 HB_ACODEC_DCA ? "DTS" : ( audio->config.in.codec ==
 559                 HB_ACODEC_MPGA ? "MPEG" : "LPCM" ) ) );
 560         snprintf( audio->config.lang.simple, sizeof( audio->config.lang.simple ), "%s",
 561                   strlen(lang->native_name) ? lang->native_name : lang->eng_name );
 562         snprintf( audio->config.lang.iso639_2, sizeof( audio->config.lang.iso639_2 ), "%s",
 563                   lang->iso639_2);
 564
 565         switch( lang_extension )
 566         {
 567         case 0:
 568         case 1:
 569             break;
 570         case 2:
 571             strcat( audio->config.lang.description, " (Visually Impaired)" );
 572             break;
 573         case 3:
 574             strcat( audio->config.lang.description, " (Director's Commentary 1)" );
 575             break;
 576         case 4:
 577             strcat( audio->config.lang.description, " (Director's Commentary 2)" );
 578             break;
 579         default:
 580             break;
 581         }
 582
 583         hb_log( "scan: id=%x, lang=%s, 3cc=%s ext=%i", audio->id,
 584                 audio->config.lang.description, audio->config.lang.iso639_2,
 585                 lang_extension );
 586
 587         audio->config.in.track = i;
 588         hb_list_add( title->list_audio, audio );
 589     }
 590
 591     if( !hb_list_count( title->list_audio ) )
 592     {
 593         hb_log( "scan: ignoring title (no audio track)" );
 594         goto fail;
 595     }
 596
 597     memcpy( title->palette,
 598             ifo->vts_pgcit->pgci_srp[title_pgcn-1].pgc->palette,
 599             16 * sizeof( uint32_t ) );
 600
 601     /* Check for subtitles */
 602     for( i = 0; i < ifo->vtsi_mat->nr_of_vts_subp_streams; i++ )
 603     {
 604         hb_subtitle_t * subtitle;
 605         int spu_control;
 606         int position;
 607         iso639_lang_t * lang;
 608         int lang_extension = 0;
 609
 610         hb_log( "scan: checking subtitle %d", i + 1 );
 611
 612         spu_control =
 613             ifo->vts_pgcit->pgci_srp[title_pgcn-1].pgc->subp_control[i];
 614
 615         if( !( spu_control & 0x80000000 ) )
 616         {
 617             hb_log( "scan: subtitle channel is not active" );
 618             continue;
 619         }
 620
 621         if( ifo->vtsi_mat->vts_video_attr.display_aspect_ratio )
 622         {
 623             switch( ifo->vtsi_mat->vts_video_attr.permitted_df )
 624             {
 625                 case 1:
 626                     position = spu_control & 0xFF;
 627                     break;
 628                 case 2:
 629                     position = ( spu_control >> 8 ) & 0xFF;
 630                     break;
 631                 default:
 632                     position = ( spu_control >> 16 ) & 0xFF;
 633             }
 634         }
 635         else
 636         {
 637             position = ( spu_control >> 24 ) & 0x7F;
 638         }
 639
 640         lang_extension = ifo->vtsi_mat->vts_subp_attr[i].code_extension;
 641
 642         lang = lang_for_code( ifo->vtsi_mat->vts_subp_attr[i].lang_code );
 643
 644         subtitle = calloc( sizeof( hb_subtitle_t ), 1 );
 645         subtitle->track = i+1;
 646         subtitle->id = ( ( 0x20 + position ) << 8 ) | 0xbd;
 647         snprintf( subtitle->lang, sizeof( subtitle->lang ), "%s",
 648              strlen(lang->native_name) ? lang->native_name : lang->eng_name);
 649         snprintf( subtitle->iso639_2, sizeof( subtitle->iso639_2 ), "%s",
 650                   lang->iso639_2);
 651         subtitle->format = PICTURESUB;
 652         subtitle->source = VOBSUB;
 653         subtitle->config.dest   = RENDERSUB;  // By default render (burn-in) the VOBSUB.
 654
 655         subtitle->type = lang_extension;
 656
 657         switch( lang_extension )
 658         {
 659         case 0:
 660             break;
 661         case 1:
 662             break;
 663         case 2:
 664             strcat( subtitle->lang, " (Caption with bigger size character)");
 665             break;
 666         case 3:
 667             strcat( subtitle->lang, " (Caption for Children)");
 668             break;
 669         case 4:
 670             break;
 671         case 5:
 672             strcat( subtitle->lang, " (Closed Caption)");
 673             break;
 674         case 6:
 675             strcat( subtitle->lang, " (Closed Caption with bigger size character)");
 676             break;
 677         case 7:
 678             strcat( subtitle->lang, " (Closed Caption for Children)");
 679             break;
 680         case 8:
 681             break;
 682         case 9:
 683             strcat( subtitle->lang, " (Forced Caption)");
 684             break;
 685         case 10:
 686             break;
 687         case 11:
 688             break;
 689         case 12:
 690             break;
 691         case 13:
 692             strcat( subtitle->lang, " (Director's Commentary)");
 693             break;
 694         case 14:
 695             strcat( subtitle->lang, " (Director's Commentary with bigger size character)");
 696             break;
 697         case 15:
 698             strcat( subtitle->lang, " (Director's Commentary for Children)");
 699         default:
 700             break;
 701         }
 702
 703         hb_log( "scan: id=%x, lang=%s, 3cc=%s", subtitle->id,
 704                 subtitle->lang, subtitle->iso639_2 );
 705
 706         hb_list_add( title->list_subtitle, subtitle );
 707     }
 708
 709     /* Chapters */
 710     uint32_t pgcn_map[MAX_PGCN/32];
 711     PgcWalkInit( pgcn_map );
 712     c = 0;
 713     do
 714     {
 715         pgc = ifo->vts_pgcit->pgci_srp[pgcn-1].pgc;
 716
 717         for (i = pgn; i <= pgc->nr_of_programs; i++)
 718         {
 719             chapter = calloc( sizeof( hb_chapter_t ), 1 );
 720
 721             chapter->index = c + 1;
 722             chapter->pgcn = pgcn;
 723             chapter->pgn = i;
 724             hb_list_add( title->list_chapter, chapter );
 725             c++;
 726         }
 727
 728         pgn = 1;
 729     } while ((pgcn = NextPgcn(ifo, pgcn, pgcn_map)) != 0);
 730
 731     hb_log( "scan: title %d has %d chapters", t, c );
 732
 733     duration = 0;
 734     count = hb_list_count( title->list_chapter );
 735     for (i = 0; i < count; i++)
 736     {
 737         chapter = hb_list_item( title->list_chapter, i );
 738
 739         pgcn = chapter->pgcn;
 740         pgn = chapter->pgn;
 741         pgc = ifo->vts_pgcit->pgci_srp[pgcn-1].pgc;
 742
 743         /* Start cell */
 744         chapter->cell_start  = pgc->program_map[pgn-1] - 1;
 745         chapter->block_start = pgc->cell_playback[chapter->cell_start].first_sector;
 746         // if there are no more programs in this pgc, the end cell is the
 747         // last cell. Otherwise it's the cell before the start cell of the
 748         // next program.
 749         if ( pgn == pgc->nr_of_programs )
 750         {
 751             chapter->cell_end = pgc->nr_of_cells - 1;
 752         }
 753         else
 754         {
 755             chapter->cell_end = pgc->program_map[pgn] - 2;;
 756         }
 757         chapter->block_end = pgc->cell_playback[chapter->cell_end].last_sector;
 758
 759         /* Block count, duration */
 760         chapter->block_count = 0;
 761         chapter->duration = 0;
 762
 763         cell_cur = chapter->cell_start;
 764         while( cell_cur <= chapter->cell_end )
 765         {
 766 #define cp pgc->cell_playback[cell_cur]
 767             chapter->block_count += cp.last_sector + 1 - cp.first_sector;
 768             chapter->duration += 90LL * dvdtime2msec( &cp.playback_time );
 769 #undef cp
 770             cell_cur = FindNextCell( pgc, cell_cur );
 771         }
 772         duration += chapter->duration;
 773     }
 774
 775     /* The durations we get for chapters aren't precise. Scale them so
 776        the total matches the title duration */
 777     duration_correction = (float) title->duration / (float) duration;
 778     for( i = 0; i < hb_list_count( title->list_chapter ); i++ )
 779     {
 780         int seconds;
 781         chapter            = hb_list_item( title->list_chapter, i );
 782         chapter->duration  = duration_correction * chapter->duration;
 783         seconds            = ( chapter->duration + 45000 ) / 90000;
 784         chapter->hours     = seconds / 3600;
 785         chapter->minutes   = ( seconds % 3600 ) / 60;
 786         chapter->seconds   = seconds % 60;
 787
 788         hb_log( "scan: chap %d c=%d->%d, b=%d->%d (%d), %"PRId64" ms",
 789                 chapter->index, chapter->cell_start, chapter->cell_end,
 790                 chapter->block_start, chapter->block_end,
 791                 chapter->block_count, chapter->duration / 90 );
 792     }
 793
 794     /* Get aspect. We don't get width/height/rate infos here as
 795        they tend to be wrong */
 796     switch( ifo->vtsi_mat->vts_video_attr.display_aspect_ratio )
 797     {
 798         case 0:
 799             title->container_aspect = 4. / 3.;
 800             break;
 801         case 3:
 802             title->container_aspect = 16. / 9.;
 803             break;
 804         default:
 805             hb_log( "scan: unknown aspect" );
 806             goto fail;
 807     }
 808
 809     hb_log( "scan: aspect = %g", title->aspect );
 810
 811     /* This title is ok so far */
 812     goto cleanup;
 813
 814 fail:
 815     hb_list_close( &title->list_audio );
 816     free( title );
 817     title = NULL;
 818
 819 cleanup:
 820     if( ifo ) ifoClose( ifo );
 821
 822     return title;
 823 }
 824
 825 /***********************************************************************
 826  * hb_dvdnav_start
 827  ***********************************************************************
 828  * Title and chapter start at 1
 829  **********************************************************************/
 830 static int hb_dvdnav_start( hb_dvd_t * e, hb_title_t *title, int c )
 831 {
 832     hb_dvdnav_t * d = &(e->dvdnav);
 833     int t = title->index;
 834     hb_chapter_t *chapter;
 835     dvdnav_status_t result;
 836
 837     d->title_block_count = title->block_count;
 838     d->list_chapter = title->list_chapter;
 839
 840     if ( d->stopped && !hb_dvdnav_reset(d) )
 841     {
 842         return 0;
 843     }
 844     chapter = hb_list_item( title->list_chapter, c - 1);
 845     if (chapter != NULL)
 846         result = dvdnav_program_play(d->dvdnav, t, chapter->pgcn, chapter->pgn);
 847     else
 848         result = dvdnav_part_play(d->dvdnav, t, 1);
 849     if (result != DVDNAV_STATUS_OK)
 850     {
 851         hb_error( "dvd: dvdnav_*_play failed - %s",
 852                   dvdnav_err_to_string(d->dvdnav) );
 853         return 0;
 854     }
 855     d->title = t;
 856     d->stopped = 0;
 857     d->chapter = 0;
 858     return 1;
 859 }
 860
 861 /***********************************************************************
 862  * hb_dvdnav_stop
 863  ***********************************************************************
 864  *
 865  **********************************************************************/
 866 static void hb_dvdnav_stop( hb_dvd_t * e )
 867 {
 868 }
 869
 870 /***********************************************************************
 871  * hb_dvdnav_seek
 872  ***********************************************************************
 873  *
 874  **********************************************************************/
 875 static int hb_dvdnav_seek( hb_dvd_t * e, float f )
 876 {
 877     hb_dvdnav_t * d = &(e->dvdnav);
 878     uint64_t sector = f * d->title_block_count;
 879     int result, event, len;
 880     uint8_t buf[HB_DVD_READ_BUFFER_SIZE];
 881     int done = 0, ii;
 882
 883     if (d->stopped)
 884     {
 885         return 0;
 886     }
 887
 888     // XXX the current version of libdvdnav can't seek outside the current
 889     // PGC. Check if the place we're seeking to is in a different
 890     // PGC. Position there & adjust the offset if so.
 891     hb_chapter_t *pgc_change = hb_list_item(d->list_chapter, 0 );
 892     for ( ii = 0; ii < hb_list_count( d->list_chapter ); ++ii )
 893     {
 894         hb_chapter_t *chapter = hb_list_item( d->list_chapter, ii );
 895
 896         if ( chapter->pgcn != pgc_change->pgcn )
 897         {
 898             // this chapter's in a different pgc from the previous - note the
 899             // change so we can make sector offset's be pgc relative.
 900             pgc_change = chapter;
 901         }
 902         if ( chapter->block_start <= sector && sector <= chapter->block_end )
 903         {
 904             // this chapter contains the sector we want - see if it's in a
 905             // different pgc than the one we're currently in.
 906             int32_t title, pgcn, pgn;
 907             if (dvdnav_current_title_program( d->dvdnav, &title, &pgcn, &pgn ) != DVDNAV_STATUS_OK)
 908                 hb_log("dvdnav cur pgcn err: %s", dvdnav_err_to_string(d->dvdnav));
 909             if ( d->title != title || chapter->pgcn != pgcn )
 910             {
 911                 // this chapter is in a different pgc - switch to it.
 912                 if (dvdnav_program_play(d->dvdnav, d->title, chapter->pgcn, chapter->pgn) != DVDNAV_STATUS_OK)
 913                     hb_log("dvdnav prog play err: %s", dvdnav_err_to_string(d->dvdnav));
 914             }
 915             // seek sectors are pgc-relative so remove the pgc start sector.
 916             sector -= pgc_change->block_start;
 917             break;
 918         }
 919     }
 920
 921     // dvdnav will not let you seek or poll current position
 922     // till it reaches a certain point in parsing.  so we
 923     // have to get blocks until we reach a cell
 924     // Put an arbitrary limit of 100 blocks on how long we search
 925     for (ii = 0; ii < 100 && !done; ii++)
 926     {
 927         result = dvdnav_get_next_block( d->dvdnav, buf, &event, &len );
 928         if ( result == DVDNAV_STATUS_ERR )
 929         {
 930             hb_log("dvdnav: Read Error, %s", dvdnav_err_to_string(d->dvdnav));
 931             return 0;
 932         }
 933         switch ( event )
 934         {
 935         case DVDNAV_BLOCK_OK:
 936         case DVDNAV_CELL_CHANGE:
 937             done = 1;
 938             break;
 939
 940         case DVDNAV_STILL_FRAME:
 941             dvdnav_still_skip( d->dvdnav );
 942             break;
 943
 944         case DVDNAV_WAIT:
 945             dvdnav_wait_skip( d->dvdnav );
 946             break;
 947
 948         case DVDNAV_STOP:
 949             hb_log("dvdnav: stop encountered during seek");
 950             d->stopped = 1;
 951             return 0;
 952
 953         case DVDNAV_HOP_CHANNEL:
 954         case DVDNAV_NAV_PACKET:
 955         case DVDNAV_VTS_CHANGE:
 956         case DVDNAV_HIGHLIGHT:
 957         case DVDNAV_AUDIO_STREAM_CHANGE:
 958         case DVDNAV_SPU_STREAM_CHANGE:
 959         case DVDNAV_SPU_CLUT_CHANGE:
 960         case DVDNAV_NOP:
 961         default:
 962             break;
 963         }
 964     }
 965
 966     if (dvdnav_sector_search(d->dvdnav, sector, SEEK_SET) != DVDNAV_STATUS_OK)
 967     {
 968         hb_error( "dvd: dvdnav_sector_search failed - %s",
 969                   dvdnav_err_to_string(d->dvdnav) );
 970         return 0;
 971     }
 972     return 1;
 973 }
 974
 975 /***********************************************************************
 976  * hb_dvdnav_read
 977  ***********************************************************************
 978  *
 979  **********************************************************************/
 980 static int hb_dvdnav_read( hb_dvd_t * e, hb_buffer_t * b )
 981 {
 982     hb_dvdnav_t * d = &(e->dvdnav);
 983     int result, event, len;
 984     int chapter = 0;
 985
 986     while ( 1 )
 987     {
 988         if (d->stopped)
 989         {
 990             return 0;
 991         }
 992         result = dvdnav_get_next_block( d->dvdnav, b->data, &event, &len );
 993         if ( result == DVDNAV_STATUS_ERR )
 994         {
 995             hb_log("dvdnav: Read Error, %s", dvdnav_err_to_string(d->dvdnav));
 996                         return 0;
 997         }
 998         switch ( event )
 999         {
1000         case DVDNAV_BLOCK_OK:
1001             // We have received a regular block of the currently playing
1002             // MPEG stream.
1003
1004             // The muxers expect to only get chapter 2 and above
1005             // They write chapter 1 when chapter 2 is detected.
1006             if (chapter > 1)
1007                 b->new_chap = chapter;
1008             chapter = 0;
1009             return 1;
1010
1011         case DVDNAV_NOP:
1012             /*
1013             * Nothing to do here.
1014             */
1015             break;
1016
1017         case DVDNAV_STILL_FRAME:
1018             /*
1019             * We have reached a still frame. A real player application
1020             * would wait the amount of time specified by the still's
1021             * length while still handling user input to make menus and
1022             * other interactive stills work. A length of 0xff means an
1023             * indefinite still which has to be skipped indirectly by some
1024             * user interaction.
1025             */
1026             dvdnav_still_skip( d->dvdnav );
1027             break;
1028
1029         case DVDNAV_WAIT:
1030             /*
1031             * We have reached a point in DVD playback, where timing is
1032             * critical. Player application with internal fifos can
1033             * introduce state inconsistencies, because libdvdnav is
1034             * always the fifo's length ahead in the stream compared to
1035             * what the application sees. Such applications should wait
1036             * until their fifos are empty when they receive this type of
1037             * event.
1038             */
1039             dvdnav_wait_skip( d->dvdnav );
1040             break;
1041
1042         case DVDNAV_SPU_CLUT_CHANGE:
1043             /*
1044             * Player applications should pass the new colour lookup table
1045             * to their SPU decoder
1046             */
1047             break;
1048
1049         case DVDNAV_SPU_STREAM_CHANGE:
1050             /*
1051             * Player applications should inform their SPU decoder to
1052             * switch channels
1053             */
1054             break;
1055
1056         case DVDNAV_AUDIO_STREAM_CHANGE:
1057             /*
1058             * Player applications should inform their audio decoder to
1059             * switch channels
1060             */
1061             break;
1062
1063         case DVDNAV_HIGHLIGHT:
1064             /*
1065             * Player applications should inform their overlay engine to
1066             * highlight the given button
1067             */
1068             break;
1069
1070         case DVDNAV_VTS_CHANGE:
1071             /*
1072             * Some status information like video aspect and video scale
1073             * permissions do not change inside a VTS. Therefore this
1074             * event can be used to query such information only when
1075             * necessary and update the decoding/displaying accordingly.
1076             */
1077             break;
1078
1079         case DVDNAV_CELL_CHANGE:
1080             /*
1081             * Some status information like the current Title and Part
1082             * numbers do not change inside a cell. Therefore this event
1083             * can be used to query such information only when necessary
1084             * and update the decoding/displaying accordingly.
1085             */
1086             {
1087                 int tt = 0, pgcn = 0, pgn = 0, c;
1088
1089                 dvdnav_current_title_program(d->dvdnav, &tt, &pgcn, &pgn);
1090                 if (tt != d->title)
1091                 {
1092                     // Transition to another title signals that we are done.
1093                     return 0;
1094                 }
1095                 c = FindChapterIndex(d->list_chapter, pgcn, pgn);
1096                 if (c != d->chapter)
1097                 {
1098                     if (c < d->chapter)
1099                     {
1100                         // Some titles end with a 'link' back to the beginning so
1101                         // a transition to an earlier chapter means we're done.
1102                         return 0;
1103                     }
1104                     chapter = d->chapter = c;
1105                 }
1106             }
1107             break;
1108
1109         case DVDNAV_NAV_PACKET:
1110             /*
1111             * A NAV packet provides PTS discontinuity information, angle
1112             * linking information and button definitions for DVD menus.
1113             * Angles are handled completely inside libdvdnav. For the
1114             * menus to work, the NAV packet information has to be passed
1115             * to the overlay engine of the player so that it knows the
1116             * dimensions of the button areas.
1117             */
1118
1119             // mpegdemux expects to get these.  I don't think it does
1120             // anything useful with them however.
1121
1122             // The muxers expect to only get chapter 2 and above
1123             // They write chapter 1 when chapter 2 is detected.
1124             if (chapter > 1)
1125                 b->new_chap = chapter;
1126             chapter = 0;
1127             return 1;
1128
1129             break;
1130
1131         case DVDNAV_HOP_CHANNEL:
1132             /*
1133             * This event is issued whenever a non-seamless operation has
1134             * been executed. Applications with fifos should drop the
1135             * fifos content to speed up responsiveness.
1136             */
1137             break;
1138
1139         case DVDNAV_STOP:
1140             /*
1141             * Playback should end here.
1142             */
1143             d->stopped = 1;
1144             return 0;
1145
1146         default:
1147             break;
1148         }
1149     }
1150     return 0;
1151 }
1152
1153 /***********************************************************************
1154  * hb_dvdnav_chapter
1155  ***********************************************************************
1156  * Returns in which chapter the next block to be read is.
1157  * Chapter numbers start at 1.
1158  **********************************************************************/
1159 static int hb_dvdnav_chapter( hb_dvd_t * e )
1160 {
1161     hb_dvdnav_t * d = &(e->dvdnav);
1162     int32_t t, pgcn, pgn;
1163     int32_t c;
1164
1165     if (dvdnav_current_title_program(d->dvdnav, &t, &pgcn, &pgn) != DVDNAV_STATUS_OK)
1166     {
1167         return -1;
1168     }
1169     c = FindChapterIndex( d->list_chapter, pgcn, pgn );
1170     return c;
1171 }
1172
1173 /***********************************************************************
1174  * hb_dvdnav_close
1175  ***********************************************************************
1176  * Closes and frees everything
1177  **********************************************************************/
1178 static void hb_dvdnav_close( hb_dvd_t ** _d )
1179 {
1180     hb_dvdnav_t * d = &((*_d)->dvdnav);
1181
1182     if( d->dvdnav ) dvdnav_close( d->dvdnav );
1183     if( d->vmg ) ifoClose( d->vmg );
1184     if( d->reader ) DVDClose( d->reader );
1185
1186     free( d );
1187     *_d = NULL;
1188 }
1189
1190 /***********************************************************************
1191  * hb_dvdnav_angle_count
1192  ***********************************************************************
1193  * Returns the number of angles supported.
1194  **********************************************************************/
1195 static int hb_dvdnav_angle_count( hb_dvd_t * e )
1196 {
1197     hb_dvdnav_t * d = &(e->dvdnav);
1198     int current, angle_count;
1199
1200     if (dvdnav_get_angle_info( d->dvdnav, &current, &angle_count) != DVDNAV_STATUS_OK)
1201     {
1202         hb_log("dvdnav_get_angle_info %s", dvdnav_err_to_string(d->dvdnav));
1203         angle_count = 1;
1204     }
1205     return angle_count;
1206 }
1207
1208 /***********************************************************************
1209  * hb_dvdnav_set_angle
1210  ***********************************************************************
1211  * Sets the angle to read
1212  **********************************************************************/
1213 static void hb_dvdnav_set_angle( hb_dvd_t * e, int angle )
1214 {
1215     hb_dvdnav_t * d = &(e->dvdnav);
1216
1217     if (dvdnav_angle_change( d->dvdnav, angle) != DVDNAV_STATUS_OK)
1218     {
1219         hb_log("dvdnav_angle_change %s", dvdnav_err_to_string(d->dvdnav));
1220     }
1221 }
1222
1223 /***********************************************************************
1224  * FindChapterIndex
1225  ***********************************************************************
1226  * Assumes pgc and cell_cur are correctly set, and sets cell_next to the
1227  * cell to be read when we will be done with cell_cur.
1228  **********************************************************************/
1229 static int FindChapterIndex( hb_list_t * list, int pgcn, int pgn )
1230 {
1231     int count, ii;
1232     hb_chapter_t *chapter;
1233
1234     count = hb_list_count( list );
1235     for (ii = 0; ii < count; ii++)
1236     {
1237         chapter = hb_list_item( list, ii );
1238         if (chapter->pgcn == pgcn && chapter->pgn == pgn)
1239             return chapter->index;
1240     }
1241     return 0;
1242 }
1243
1244 /***********************************************************************
1245  * FindNextCell
1246  ***********************************************************************
1247  * Assumes pgc and cell_cur are correctly set, and sets cell_next to the
1248  * cell to be read when we will be done with cell_cur.
1249  **********************************************************************/
1250 static int FindNextCell( pgc_t *pgc, int cell_cur )
1251 {
1252     int i = 0;
1253     int cell_next;
1254
1255     if( pgc->cell_playback[cell_cur].block_type ==
1256             BLOCK_TYPE_ANGLE_BLOCK )
1257     {
1258
1259         while( pgc->cell_playback[cell_cur+i].block_mode !=
1260                    BLOCK_MODE_LAST_CELL )
1261         {
1262              i++;
1263         }
1264         cell_next = cell_cur + i + 1;
1265         hb_log( "dvd: Skipping multi-angle cells %d-%d",
1266                 cell_cur,
1267                 cell_next - 1 );
1268     }
1269     else
1270     {
1271         cell_next = cell_cur + 1;
1272     }
1273     return cell_next;
1274 }
1275
1276 /***********************************************************************
1277  * NextPgcn
1278  ***********************************************************************
1279  * Assumes pgc and cell_cur are correctly set, and sets cell_next to the
1280  * cell to be read when we will be done with cell_cur.
1281  * Since pg chains can be circularly linked (either from a read error or
1282  * deliberately) pgcn_map tracks program chains we've already seen.
1283  **********************************************************************/
1284 static int NextPgcn( ifo_handle_t *ifo, int pgcn, uint32_t pgcn_map[MAX_PGCN/32] )
1285 {
1286     int next_pgcn;
1287     pgc_t *pgc;
1288
1289     pgcn_map[pgcn >> 5] |= (1 << (pgcn & 31));
1290
1291     pgc = ifo->vts_pgcit->pgci_srp[pgcn-1].pgc;
1292     next_pgcn = pgc->next_pgc_nr;
1293     if ( next_pgcn < 1 || next_pgcn >= MAX_PGCN || next_pgcn > ifo->vts_pgcit->nr_of_pgci_srp )
1294         return 0;
1295
1296     return pgcn_map[next_pgcn >> 5] & (1 << (next_pgcn & 31))? 0 : next_pgcn;
1297 }
1298
1299 /***********************************************************************
1300  * PgcWalkInit
1301  ***********************************************************************
1302  * Pgc links can loop. I track which have been visited in a bit vector
1303  * Initialize the bit vector to empty.
1304  **********************************************************************/
1305 static void PgcWalkInit( uint32_t pgcn_map[MAX_PGCN/32] )
1306 {
1307     memset(pgcn_map, 0, sizeof(pgcn_map) );
1308 }
1309
1310 /***********************************************************************
1311  * dvdtime2msec
1312  ***********************************************************************
1313  * From lsdvd
1314  **********************************************************************/
1315 static int dvdtime2msec(dvd_time_t * dt)
1316 {
1317     double frames_per_s[4] = {-1.0, 25.00, -1.0, 29.97};
1318     double fps = frames_per_s[(dt->frame_u & 0xc0) >> 6];
1319     long   ms;
1320     ms  = (((dt->hour &   0xf0) >> 3) * 5 + (dt->hour   & 0x0f)) * 3600000;
1321     ms += (((dt->minute & 0xf0) >> 3) * 5 + (dt->minute & 0x0f)) * 60000;
1322     ms += (((dt->second & 0xf0) >> 3) * 5 + (dt->second & 0x0f)) * 1000;
1323
1324     if( fps > 0 )
1325     {
1326         ms += ((dt->frame_u & 0x30) >> 3) * 5 +
1327               (dt->frame_u & 0x0f) * 1000.0 / fps;
1328     }
1329
1330     return ms;
1331 }