git.sesse.net Git - vlc/blob - modules/demux/vobsub.c

   1 /*****************************************************************************
   2  * subtitle.c: Demux vobsub files.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Derk-Jan Hartman <hartman at videolan dot org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34
  35 #include <errno.h>
  36 #include <sys/types.h>
  37
  38 #include <vlc_demux.h>
  39 #include <vlc_charset.h>
  40
  41 #include "ps.h"
  42
  43 #define MAX_LINE 8192
  44
  45 /*****************************************************************************
  46  * Module descriptor
  47  *****************************************************************************/
  48 static int  Open ( vlc_object_t *p_this );
  49 static void Close( vlc_object_t *p_this );
  50
  51 vlc_module_begin();
  52     set_description( N_("Vobsub subtitles parser") );
  53     set_category( CAT_INPUT );
  54     set_subcategory( SUBCAT_INPUT_DEMUX );
  55     set_capability( "demux", 1 );
  56
  57     set_callbacks( Open, Close );
  58
  59     add_shortcut( "vobsub" );
  60     add_shortcut( "subtitle" );
  61 vlc_module_end();
  62
  63 /*****************************************************************************
  64  * Prototypes:
  65  *****************************************************************************/
  66
  67 typedef struct
  68 {
  69     int     i_line_count;
  70     int     i_line;
  71     char    **line;
  72 } text_t;
  73 static int  TextLoad( text_t *, stream_t *s );
  74 static void TextUnload( text_t * );
  75
  76 typedef struct
  77 {
  78     int64_t i_start;
  79     int     i_vobsub_location;
  80 } subtitle_t;
  81
  82 typedef struct
  83 {
  84     es_format_t fmt;
  85     es_out_id_t *p_es;
  86     int         i_track_id;
  87
  88     int         i_current_subtitle;
  89     int         i_subtitles;
  90     subtitle_t  *p_subtitles;
  91
  92     int64_t     i_delay;
  93 } vobsub_track_t;
  94
  95 struct demux_sys_t
  96 {
  97     int64_t     i_next_demux_date;
  98     int64_t     i_length;
  99
 100     text_t      txt;
 101     stream_t    *p_vobsub_stream;
 102
 103     /* all tracks */
 104     int            i_tracks;
 105     vobsub_track_t *track;
 106
 107     int         i_original_frame_width;
 108     int         i_original_frame_height;
 109     bool  b_palette;
 110     uint32_t    palette[16];
 111 };
 112
 113 static int Demux( demux_t * );
 114 static int Control( demux_t *, int, va_list );
 115
 116 static int ParseVobSubIDX( demux_t * );
 117 static int DemuxVobSub( demux_t *, block_t *);
 118
 119 /*****************************************************************************
 120  * Module initializer
 121  *****************************************************************************/
 122 static int Open ( vlc_object_t *p_this )
 123 {
 124     demux_t     *p_demux = (demux_t*)p_this;
 125     demux_sys_t *p_sys;
 126     char *psz_vobname, *s;
 127     int i_len;
 128
 129     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 130     {
 131         if( !strcasestr( s, "# VobSub index file" ) )
 132         {
 133             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 134             free( s );
 135             if( stream_Seek( p_demux->s, 0 ) )
 136             {
 137                 msg_Warn( p_demux, "failed to rewind" );
 138             }
 139             return VLC_EGENERIC;
 140         }
 141         free( s );
 142
 143     }
 144     else
 145     {
 146         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 147         return VLC_EGENERIC;
 148     }
 149
 150     p_demux->pf_demux = Demux;
 151     p_demux->pf_control = Control;
 152     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 153     p_sys->i_length = 0;
 154     p_sys->p_vobsub_stream = NULL;
 155     p_sys->i_tracks = 0;
 156     p_sys->track = (vobsub_track_t *)malloc( sizeof( vobsub_track_t ) );
 157     p_sys->i_original_frame_width = -1;
 158     p_sys->i_original_frame_height = -1;
 159     p_sys->b_palette = false;
 160     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 161
 162     /* Load the whole file */
 163     TextLoad( &p_sys->txt, p_demux->s );
 164
 165     /* Parse it */
 166     ParseVobSubIDX( p_demux );
 167
 168     /* Unload */
 169     TextUnload( &p_sys->txt );
 170
 171     /* Find the total length of the vobsubs */
 172     if( p_sys->i_tracks > 0 )
 173     {
 174         int i;
 175         for( i = 0; i < p_sys->i_tracks; i++ )
 176         {
 177             if( p_sys->track[i].i_subtitles > 1 )
 178             {
 179                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 180                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 181             }
 182         }
 183     }
 184
 185     if( asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_path ) == -1 )
 186     {
 187         free( p_sys );
 188         return VLC_EGENERIC;
 189     }
 190     i_len = strlen( psz_vobname );
 191     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 192
 193     /* open file */
 194     p_sys->p_vobsub_stream = stream_UrlNew( p_demux, psz_vobname );
 195     if( p_sys->p_vobsub_stream == NULL )
 196     {
 197         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 198                  psz_vobname );
 199         free( psz_vobname );
 200         free( p_sys );
 201         return VLC_EGENERIC;
 202     }
 203     free( psz_vobname );
 204
 205     return VLC_SUCCESS;
 206 }
 207
 208 /*****************************************************************************
 209  * Close: Close subtitle demux
 210  *****************************************************************************/
 211 static void Close( vlc_object_t *p_this )
 212 {
 213     int i;
 214     demux_t *p_demux = (demux_t*)p_this;
 215     demux_sys_t *p_sys = p_demux->p_sys;
 216
 217     /* Clean all subs from all tracks */
 218     for( i = 0; i < p_sys->i_tracks; i++ )
 219         free( p_sys->track[i].p_subtitles );
 220
 221     free( p_sys->track );
 222
 223     if( p_sys->p_vobsub_stream )
 224         stream_Delete( p_sys->p_vobsub_stream );
 225
 226     free( p_sys );
 227 }
 228
 229 /*****************************************************************************
 230  * Control:
 231  *****************************************************************************/
 232 static int Control( demux_t *p_demux, int i_query, va_list args )
 233 {
 234     demux_sys_t *p_sys = p_demux->p_sys;
 235     int64_t *pi64, i64;
 236     int i;
 237     double *pf, f;
 238
 239     switch( i_query )
 240     {
 241         case DEMUX_GET_LENGTH:
 242             pi64 = (int64_t*)va_arg( args, int64_t * );
 243             *pi64 = (int64_t) p_sys->i_length;
 244             return VLC_SUCCESS;
 245
 246         case DEMUX_GET_TIME:
 247             pi64 = (int64_t*)va_arg( args, int64_t * );
 248             for( i = 0; i < p_sys->i_tracks; i++ )
 249             {
 250                 bool b_selected;
 251                 /* Check the ES is selected */
 252                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 253                                 p_sys->track[i].p_es, &b_selected );
 254                 if( b_selected ) break;
 255             }
 256             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 257             {
 258                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 259                 return VLC_SUCCESS;
 260             }
 261             return VLC_EGENERIC;
 262
 263         case DEMUX_SET_TIME:
 264             i64 = (int64_t)va_arg( args, int64_t );
 265             for( i = 0; i < p_sys->i_tracks; i++ )
 266             {
 267                 p_sys->track[i].i_current_subtitle = 0;
 268                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 269                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 270                 {
 271                     p_sys->track[i].i_current_subtitle++;
 272                 }
 273
 274                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 275                     return VLC_EGENERIC;
 276             }
 277             return VLC_SUCCESS;
 278
 279         case DEMUX_GET_POSITION:
 280             pf = (double*)va_arg( args, double * );
 281             for( i = 0; i < p_sys->i_tracks; i++ )
 282             {
 283                 bool b_selected;
 284                 /* Check the ES is selected */
 285                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 286                                 p_sys->track[i].p_es, &b_selected );
 287                 if( b_selected ) break;
 288             }
 289             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 290             {
 291                 *pf = 1.0;
 292             }
 293             else if( p_sys->track[i].i_subtitles > 0 )
 294             {
 295                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 296                       (double)p_sys->i_length;
 297             }
 298             else
 299             {
 300                 *pf = 0.0;
 301             }
 302             return VLC_SUCCESS;
 303
 304         case DEMUX_SET_POSITION:
 305             f = (double)va_arg( args, double );
 306             i64 = (int64_t) f * p_sys->i_length;
 307
 308             for( i = 0; i < p_sys->i_tracks; i++ )
 309             {
 310                 p_sys->track[i].i_current_subtitle = 0;
 311                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 312                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 313                 {
 314                     p_sys->track[i].i_current_subtitle++;
 315                 }
 316                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 317                     return VLC_EGENERIC;
 318             }
 319             return VLC_SUCCESS;
 320
 321         case DEMUX_SET_NEXT_DEMUX_TIME:
 322             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 323             return VLC_SUCCESS;
 324
 325         case DEMUX_GET_FPS:
 326         case DEMUX_GET_META:
 327         case DEMUX_GET_TITLE_INFO:
 328         case DEMUX_HAS_UNSUPPORTED_META:
 329         case DEMUX_GET_ATTACHMENTS:
 330         case DEMUX_CAN_RECORD:
 331             return VLC_EGENERIC;
 332
 333         default:
 334             msg_Warn( p_demux, "unknown query in subtitle control" );
 335             return VLC_EGENERIC;
 336     }
 337 }
 338
 339 /*****************************************************************************
 340  * Demux: Send subtitle to decoder
 341  *****************************************************************************/
 342 static int Demux( demux_t *p_demux )
 343 {
 344     demux_sys_t *p_sys = p_demux->p_sys;
 345     int64_t i_maxdate;
 346     int i, i_read;
 347
 348     for( i = 0; i < p_sys->i_tracks; i++ )
 349     {
 350 #define tk p_sys->track[i]
 351         if( tk.i_current_subtitle >= tk.i_subtitles )
 352             continue;
 353
 354         i_maxdate = p_sys->i_next_demux_date;
 355         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 356         {
 357             /* Should not happen */
 358             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 359         }
 360
 361         while( tk.i_current_subtitle < tk.i_subtitles &&
 362                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 363         {
 364             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 365             block_t *p_block;
 366             int i_size = 0;
 367
 368             /* first compute SPU size */
 369             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 370             {
 371                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 372             }
 373             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 374
 375             /* Seek at the right place */
 376             if( stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 377             {
 378                 msg_Warn( p_demux,
 379                           "cannot seek in the VobSub to the correct time %d", i_pos );
 380                 tk.i_current_subtitle++;
 381                 continue;
 382             }
 383
 384             /* allocate a packet */
 385             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 386             {
 387                 tk.i_current_subtitle++;
 388                 continue;
 389             }
 390
 391             /* read data */
 392             i_read = stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 393             if( i_read <= 6 )
 394             {
 395                 block_Release( p_block );
 396                 tk.i_current_subtitle++;
 397                 continue;
 398             }
 399             p_block->i_buffer = i_read;
 400
 401             /* pts */
 402             p_block->i_pts = tk.p_subtitles[tk.i_current_subtitle].i_start;
 403
 404             /* demux this block */
 405             DemuxVobSub( p_demux, p_block );
 406
 407             tk.i_current_subtitle++;
 408         }
 409 #undef tk
 410     }
 411
 412     /* */
 413     p_sys->i_next_demux_date = 0;
 414
 415     return 1;
 416 }
 417
 418 static int TextLoad( text_t *txt, stream_t *s )
 419 {
 420     int   i_line_max;
 421
 422     /* init txt */
 423     i_line_max          = 500;
 424     txt->i_line_count   = 0;
 425     txt->i_line         = 0;
 426     txt->line           = calloc( i_line_max, sizeof( char * ) );
 427     if( !txt->line )
 428         return VLC_EGENERIC;
 429
 430     /* load the complete file */
 431     for( ;; )
 432     {
 433         char *psz = stream_ReadLine( s );
 434
 435         if( psz == NULL )
 436             break;
 437
 438         txt->line[txt->i_line_count++] = psz;
 439         if( txt->i_line_count >= i_line_max )
 440         {
 441             char **ppsz_old = txt->line;
 442
 443             i_line_max += 100;
 444             txt->line = realloc( txt->line, i_line_max * sizeof( char*) );
 445             if( !txt->line )
 446             {
 447                 free( ppsz_old );
 448                 break;
 449             }
 450         }
 451     }
 452
 453     if( txt->i_line_count <= 0 )
 454     {
 455         free( txt->line );
 456         return VLC_EGENERIC;
 457     }
 458
 459     return VLC_SUCCESS;
 460 }
 461 static void TextUnload( text_t *txt )
 462 {
 463     int i;
 464
 465     for( i = 0; i < txt->i_line_count; i++ )
 466         free( txt->line[i] );
 467
 468     free( txt->line );
 469     txt->i_line       = 0;
 470     txt->i_line_count = 0;
 471 }
 472
 473 static char *TextGetLine( text_t *txt )
 474 {
 475     if( txt->i_line >= txt->i_line_count )
 476         return( NULL );
 477
 478     return txt->line[txt->i_line++];
 479 }
 480
 481 static int ParseVobSubIDX( demux_t *p_demux )
 482 {
 483     demux_sys_t *p_sys = p_demux->p_sys;
 484     text_t      *txt = &p_sys->txt;
 485     char        *line;
 486     vobsub_track_t *current_tk = NULL;
 487
 488     for( ;; )
 489     {
 490         if( ( line = TextGetLine( txt ) ) == NULL )
 491         {
 492             return( VLC_EGENERIC );
 493         }
 494
 495         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 496         {
 497             continue;
 498         }
 499         else if( !strncmp( "size:", line, 5 ) )
 500         {
 501             /* Store the original size of the video */
 502             if( sscanf( line, "size: %dx%d",
 503                         &p_sys->i_original_frame_width, &p_sys->i_original_frame_height ) == 2 )
 504             {
 505                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 506             }
 507             else
 508             {
 509                 msg_Warn( p_demux, "reading original frame size failed" );
 510             }
 511         }
 512         else if( !strncmp( "palette:", line, 8 ) )
 513         {
 514             int i;
 515
 516             /* Store the palette of the subs */
 517             if( sscanf( line, "palette: %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x",
 518                         &p_sys->palette[0], &p_sys->palette[1], &p_sys->palette[2], &p_sys->palette[3],
 519                         &p_sys->palette[4], &p_sys->palette[5], &p_sys->palette[6], &p_sys->palette[7],
 520                         &p_sys->palette[8], &p_sys->palette[9], &p_sys->palette[10], &p_sys->palette[11],
 521                         &p_sys->palette[12], &p_sys->palette[13], &p_sys->palette[14], &p_sys->palette[15] ) == 16 )
 522             {
 523                 for( i = 0; i < 16; i++ )
 524                 {
 525                     uint8_t r = 0, g = 0, b = 0;
 526                     uint8_t y = 0, u = 0, v = 0;
 527                     r = (p_sys->palette[i] >> 16) & 0xff;
 528                     g = (p_sys->palette[i] >> 8) & 0xff;
 529                     b = (p_sys->palette[i] >> 0) & 0xff;
 530                     /* msg_Dbg( p_demux, "palette %d: R=%x, G=%x, B=%x", i, r, g, b ); */
 531                     y = (uint8_t) __MIN(abs(r * 2104 + g * 4130 + b * 802 + 4096 + 131072) >> 13, 235);
 532                     u = (uint8_t) __MIN(abs(r * -1214 + g * -2384 + b * 3598 + 4096 + 1048576) >> 13, 240);
 533                     v = (uint8_t) __MIN(abs(r * 3598 + g * -3013 + b * -585 + 4096 + 1048576) >> 13, 240);
 534                     p_sys->palette[i] = 0;
 535                     p_sys->palette[i] |= (y&0xff)<<16;
 536                     p_sys->palette[i] |= (u&0xff);
 537                     p_sys->palette[i] |= (v&0xff)<<8;
 538                     /* msg_Dbg( p_demux, "palette %d: y=%x, u=%x, v=%x", i, y, u, v ); */
 539
 540                 }
 541                 p_sys->b_palette = true;
 542                 msg_Dbg( p_demux, "vobsub palette read" );
 543             }
 544             else
 545             {
 546                 msg_Warn( p_demux, "reading original palette failed" );
 547             }
 548         }
 549         else if( !strncmp( "id:", line, 3 ) )
 550         {
 551             char language[20];
 552             int i_track_id;
 553             es_format_t fmt;
 554
 555             /* Lets start a new track */
 556             if( sscanf( line, "id: %2s, index: %d",
 557                         language, &i_track_id ) == 2 )
 558             {
 559                 p_sys->i_tracks++;
 560                 p_sys->track = realloc( p_sys->track, sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 561
 562                 /* Init the track */
 563                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
 564                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
 565                 current_tk->i_current_subtitle = 0;
 566                 current_tk->i_subtitles = 0;
 567                 current_tk->p_subtitles = malloc( sizeof( subtitle_t ) );;
 568                 current_tk->i_track_id = i_track_id;
 569                 current_tk->i_delay = (int64_t)0;
 570
 571                 es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
 572                 fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 573                 fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 574                 fmt.psz_language = strdup( language );
 575                 if( p_sys->b_palette )
 576                 {
 577                     fmt.subs.spu.palette[0] = 0xBeef;
 578                     memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 579                 }
 580
 581                 current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 582                 msg_Dbg( p_demux, "new vobsub track detected" );
 583             }
 584             else
 585             {
 586                 msg_Warn( p_demux, "reading new track failed" );
 587             }
 588         }
 589         else if( !strncmp( line, "timestamp:", 10 ) )
 590         {
 591             /*
 592              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 593              * loc is the hex location of the spu in the .sub file
 594              */
 595             int h, m, s, ms, count, loc = 0;
 596             int i_sign = 1;
 597             int64_t i_start, i_location = 0;
 598
 599             if( p_sys->i_tracks > 0 &&
 600                 sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 601                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 602             {
 603                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 604                 subtitle_t *current_sub;
 605
 606                 if( line[count-3] == '-' )
 607                 {
 608                     i_sign = -1;
 609                     h = -h;
 610                 }
 611                 i_start = (int64_t) ( h * 3600*1000 +
 612                             m * 60*1000 +
 613                             s * 1000 +
 614                             ms ) * 1000;
 615                 i_location = loc;
 616
 617                 current_tk->i_subtitles++;
 618                 current_tk->p_subtitles = realloc( current_tk->p_subtitles, sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 619                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 620
 621                 current_sub->i_start = i_start * i_sign;
 622                 current_sub->i_start += current_tk->i_delay;
 623                 current_sub->i_vobsub_location = i_location;
 624             }
 625             else
 626             {
 627                 msg_Warn( p_demux, "reading timestamp failed" );
 628             }
 629         }
 630         else if( !strncasecmp( line, "delay:", 6 ) )
 631         {
 632             /*
 633              * delay: [sign]hh:mm:ss:mss
 634              */
 635             int h, m, s, ms, count = 0;
 636             int i_sign = 1;
 637             int64_t i_gap = 0;
 638
 639             if( p_sys->i_tracks > 0 &&
 640                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 641                         &h, &count, &m, &s, &ms ) >= 4 )
 642             {
 643                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 644                 if( line[count-3] == '-' )
 645                 {
 646                     i_sign = -1;
 647                     h = -h;
 648                 }
 649                 i_gap = (int64_t) ( h * 3600*1000 +
 650                             m * 60*1000 +
 651                             s * 1000 +
 652                             ms ) * 1000;
 653
 654                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 655                 msg_Dbg( p_demux, "sign: %+d gap: %+lld global delay: %+lld",
 656                          i_sign, (long long)i_gap,
 657                          (long long)current_tk->i_delay  );
 658             }
 659             else
 660             {
 661                 msg_Warn( p_demux, "reading delay failed" );
 662             }
 663         }
 664     }
 665     return( 0 );
 666 }
 667
 668 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 669 {
 670     demux_sys_t *p_sys = p_demux->p_sys;
 671     uint8_t     *p = p_bk->p_buffer;
 672     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 673     int i;
 674
 675     while( p + 6 < p_end )
 676     {
 677         int i_size = ps_pkt_size( p, p_end - p );
 678         block_t *p_pkt;
 679         int      i_id;
 680         int      i_spu;
 681
 682         if( i_size <= 0 )
 683             break;
 684
 685         if( i_size > p_end - p )
 686         {
 687             msg_Warn( p_demux, "broken PES size" );
 688             break;
 689         }
 690
 691         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 692         {
 693             msg_Warn( p_demux, "invalid PES" );
 694             break;
 695         }
 696
 697         if( p[3] != 0xbd )
 698         {
 699             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 700             p += i_size;
 701             continue;
 702         }
 703
 704         /* Create a block */
 705         p_pkt = block_New( p_demux, i_size );
 706         memcpy( p_pkt->p_buffer, p, i_size);
 707         p += i_size;
 708
 709         i_id = ps_pkt_id( p_pkt );
 710         if( (i_id&0xffe0) != 0xbd20 ||
 711             ps_pkt_parse_pes( p_pkt, 1 ) )
 712         {
 713             block_Release( p_pkt );
 714             continue;
 715         }
 716         i_spu = i_id&0x1f;
 717         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 718
 719         for( i = 0; i < p_sys->i_tracks; i++ )
 720         {
 721             vobsub_track_t *p_tk = &p_sys->track[i];
 722
 723             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 724             p_pkt->i_length = 0;
 725
 726             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 727             {
 728                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 729                 p_bk->i_pts = 0;     /*only first packet has a pts */
 730                 break;
 731             }
 732             else if( i == p_sys->i_tracks - 1 )
 733             {
 734                 block_Release( p_pkt );
 735             }
 736         }
 737     }
 738
 739     return VLC_SUCCESS;
 740 }
 741