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 <sys/types.h>
  36 #include <limits.h>
  37
  38 #include <vlc_demux.h>
  39 #include <vlc_charset.h>
  40
  41 #include "ps.h"
  42 #include "vobsub.h"
  43
  44 #define MAX_LINE 8192
  45
  46 /*****************************************************************************
  47  * Module descriptor
  48  *****************************************************************************/
  49 static int  Open ( vlc_object_t *p_this );
  50 static void Close( vlc_object_t *p_this );
  51
  52 vlc_module_begin ()
  53     set_description( N_("Vobsub subtitles parser") )
  54     set_category( CAT_INPUT )
  55     set_subcategory( SUBCAT_INPUT_DEMUX )
  56     set_capability( "demux", 1 )
  57
  58     set_callbacks( Open, Close )
  59
  60     add_shortcut( "vobsub" )
  61     add_shortcut( "subtitle" )
  62 vlc_module_end ()
  63
  64 /*****************************************************************************
  65  * Prototypes:
  66  *****************************************************************************/
  67
  68 typedef struct
  69 {
  70     int     i_line_count;
  71     int     i_line;
  72     char    **line;
  73 } text_t;
  74 static int  TextLoad( text_t *, stream_t *s );
  75 static void TextUnload( text_t * );
  76
  77 typedef struct
  78 {
  79     int64_t i_start;
  80     int     i_vobsub_location;
  81 } subtitle_t;
  82
  83 typedef struct
  84 {
  85     es_format_t fmt;
  86     es_out_id_t *p_es;
  87     int         i_track_id;
  88
  89     int         i_current_subtitle;
  90     int         i_subtitles;
  91     subtitle_t  *p_subtitles;
  92
  93     int64_t     i_delay;
  94 } vobsub_track_t;
  95
  96 struct demux_sys_t
  97 {
  98     int64_t     i_next_demux_date;
  99     int64_t     i_length;
 100
 101     text_t      txt;
 102     stream_t    *p_vobsub_stream;
 103
 104     /* all tracks */
 105     int            i_tracks;
 106     vobsub_track_t *track;
 107
 108     int         i_original_frame_width;
 109     int         i_original_frame_height;
 110     bool  b_palette;
 111     uint32_t    palette[16];
 112 };
 113
 114 static int Demux( demux_t * );
 115 static int Control( demux_t *, int, va_list );
 116
 117 static int ParseVobSubIDX( demux_t * );
 118 static int DemuxVobSub( demux_t *, block_t *);
 119
 120 /*****************************************************************************
 121  * Module initializer
 122  *****************************************************************************/
 123 static int Open ( vlc_object_t *p_this )
 124 {
 125     demux_t     *p_demux = (demux_t*)p_this;
 126     demux_sys_t *p_sys;
 127     char *psz_vobname, *s;
 128     int i_len;
 129
 130     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 131     {
 132         if( !strcasestr( s, "# VobSub index file" ) )
 133         {
 134             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 135             free( s );
 136             if( stream_Seek( p_demux->s, 0 ) )
 137             {
 138                 msg_Warn( p_demux, "failed to rewind" );
 139             }
 140             return VLC_EGENERIC;
 141         }
 142         free( s );
 143
 144     }
 145     else
 146     {
 147         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 148         return VLC_EGENERIC;
 149     }
 150
 151     p_demux->pf_demux = Demux;
 152     p_demux->pf_control = Control;
 153     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 154     if( unlikely( !p_sys ) )
 155         return VLC_ENOMEM;
 156     p_sys->i_length = 0;
 157     p_sys->p_vobsub_stream = NULL;
 158     p_sys->i_tracks = 0;
 159     p_sys->track = malloc( sizeof( vobsub_track_t ) );
 160     if( unlikely( !p_sys->track ) )
 161     {
 162         free( p_sys );
 163         return VLC_ENOMEM;
 164     }
 165     p_sys->i_original_frame_width = -1;
 166     p_sys->i_original_frame_height = -1;
 167     p_sys->b_palette = false;
 168     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 169
 170     /* Load the whole file */
 171     TextLoad( &p_sys->txt, p_demux->s );
 172
 173     /* Parse it */
 174     ParseVobSubIDX( p_demux );
 175
 176     /* Unload */
 177     TextUnload( &p_sys->txt );
 178
 179     /* Find the total length of the vobsubs */
 180     if( p_sys->i_tracks > 0 )
 181     {
 182         int i;
 183         for( i = 0; i < p_sys->i_tracks; i++ )
 184         {
 185             if( p_sys->track[i].i_subtitles > 1 )
 186             {
 187                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 188                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 189             }
 190         }
 191     }
 192
 193     if( asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_path ) == -1 )
 194     {
 195         free( p_sys );
 196         return VLC_EGENERIC;
 197     }
 198     i_len = strlen( psz_vobname );
 199     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 200
 201     /* open file */
 202     p_sys->p_vobsub_stream = stream_UrlNew( p_demux, psz_vobname );
 203     if( p_sys->p_vobsub_stream == NULL )
 204     {
 205         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 206                  psz_vobname );
 207         free( psz_vobname );
 208         free( p_sys );
 209         return VLC_EGENERIC;
 210     }
 211     free( psz_vobname );
 212
 213     return VLC_SUCCESS;
 214 }
 215
 216 /*****************************************************************************
 217  * Close: Close subtitle demux
 218  *****************************************************************************/
 219 static void Close( vlc_object_t *p_this )
 220 {
 221     int i;
 222     demux_t *p_demux = (demux_t*)p_this;
 223     demux_sys_t *p_sys = p_demux->p_sys;
 224
 225     /* Clean all subs from all tracks */
 226     for( i = 0; i < p_sys->i_tracks; i++ )
 227         free( p_sys->track[i].p_subtitles );
 228
 229     free( p_sys->track );
 230
 231     if( p_sys->p_vobsub_stream )
 232         stream_Delete( p_sys->p_vobsub_stream );
 233
 234     free( p_sys );
 235 }
 236
 237 /*****************************************************************************
 238  * Control:
 239  *****************************************************************************/
 240 static int Control( demux_t *p_demux, int i_query, va_list args )
 241 {
 242     demux_sys_t *p_sys = p_demux->p_sys;
 243     int64_t *pi64, i64;
 244     int i;
 245     double *pf, f;
 246
 247     switch( i_query )
 248     {
 249         case DEMUX_GET_LENGTH:
 250             pi64 = (int64_t*)va_arg( args, int64_t * );
 251             *pi64 = (int64_t) p_sys->i_length;
 252             return VLC_SUCCESS;
 253
 254         case DEMUX_GET_TIME:
 255             pi64 = (int64_t*)va_arg( args, int64_t * );
 256             for( i = 0; i < p_sys->i_tracks; i++ )
 257             {
 258                 bool b_selected;
 259                 /* Check the ES is selected */
 260                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 261                                 p_sys->track[i].p_es, &b_selected );
 262                 if( b_selected ) break;
 263             }
 264             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 265             {
 266                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 267                 return VLC_SUCCESS;
 268             }
 269             return VLC_EGENERIC;
 270
 271         case DEMUX_SET_TIME:
 272             i64 = (int64_t)va_arg( args, int64_t );
 273             for( i = 0; i < p_sys->i_tracks; i++ )
 274             {
 275                 p_sys->track[i].i_current_subtitle = 0;
 276                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 277                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 278                 {
 279                     p_sys->track[i].i_current_subtitle++;
 280                 }
 281
 282                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 283                     return VLC_EGENERIC;
 284             }
 285             return VLC_SUCCESS;
 286
 287         case DEMUX_GET_POSITION:
 288             pf = (double*)va_arg( args, double * );
 289             for( i = 0; i < p_sys->i_tracks; i++ )
 290             {
 291                 bool b_selected;
 292                 /* Check the ES is selected */
 293                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 294                                 p_sys->track[i].p_es, &b_selected );
 295                 if( b_selected ) break;
 296             }
 297             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 298             {
 299                 *pf = 1.0;
 300             }
 301             else if( p_sys->track[i].i_subtitles > 0 )
 302             {
 303                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 304                       (double)p_sys->i_length;
 305             }
 306             else
 307             {
 308                 *pf = 0.0;
 309             }
 310             return VLC_SUCCESS;
 311
 312         case DEMUX_SET_POSITION:
 313             f = (double)va_arg( args, double );
 314             i64 = (int64_t) f * p_sys->i_length;
 315
 316             for( i = 0; i < p_sys->i_tracks; i++ )
 317             {
 318                 p_sys->track[i].i_current_subtitle = 0;
 319                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 320                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 321                 {
 322                     p_sys->track[i].i_current_subtitle++;
 323                 }
 324                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 325                     return VLC_EGENERIC;
 326             }
 327             return VLC_SUCCESS;
 328
 329         case DEMUX_SET_NEXT_DEMUX_TIME:
 330             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 331             return VLC_SUCCESS;
 332
 333         case DEMUX_GET_FPS:
 334         case DEMUX_GET_META:
 335         case DEMUX_GET_TITLE_INFO:
 336         case DEMUX_HAS_UNSUPPORTED_META:
 337         case DEMUX_GET_ATTACHMENTS:
 338         case DEMUX_CAN_RECORD:
 339             return VLC_EGENERIC;
 340
 341         default:
 342             msg_Warn( p_demux, "unknown query in subtitle control" );
 343             return VLC_EGENERIC;
 344     }
 345 }
 346
 347 /*****************************************************************************
 348  * Demux: Send subtitle to decoder
 349  *****************************************************************************/
 350 static int Demux( demux_t *p_demux )
 351 {
 352     demux_sys_t *p_sys = p_demux->p_sys;
 353     int64_t i_maxdate;
 354     int i, i_read;
 355
 356     for( i = 0; i < p_sys->i_tracks; i++ )
 357     {
 358 #define tk p_sys->track[i]
 359         if( tk.i_current_subtitle >= tk.i_subtitles )
 360             continue;
 361
 362         i_maxdate = p_sys->i_next_demux_date;
 363         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 364         {
 365             /* Should not happen */
 366             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 367         }
 368
 369         while( tk.i_current_subtitle < tk.i_subtitles &&
 370                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 371         {
 372             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 373             block_t *p_block;
 374             int i_size = 0;
 375
 376             /* first compute SPU size */
 377             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 378             {
 379                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 380             }
 381             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 382
 383             /* Seek at the right place */
 384             if( stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 385             {
 386                 msg_Warn( p_demux,
 387                           "cannot seek in the VobSub to the correct time %d", i_pos );
 388                 tk.i_current_subtitle++;
 389                 continue;
 390             }
 391
 392             /* allocate a packet */
 393             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 394             {
 395                 tk.i_current_subtitle++;
 396                 continue;
 397             }
 398
 399             /* read data */
 400             i_read = stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 401             if( i_read <= 6 )
 402             {
 403                 block_Release( p_block );
 404                 tk.i_current_subtitle++;
 405                 continue;
 406             }
 407             p_block->i_buffer = i_read;
 408
 409             /* pts */
 410             p_block->i_pts = VLC_TS_0 + tk.p_subtitles[tk.i_current_subtitle].i_start;
 411
 412             /* demux this block */
 413             DemuxVobSub( p_demux, p_block );
 414
 415             tk.i_current_subtitle++;
 416         }
 417 #undef tk
 418     }
 419
 420     /* */
 421     p_sys->i_next_demux_date = 0;
 422
 423     return 1;
 424 }
 425
 426 static int TextLoad( text_t *txt, stream_t *s )
 427 {
 428     char **lines = NULL;
 429     size_t n = 0;
 430
 431     /* load the complete file */
 432     for( ;; )
 433     {
 434         char *psz = stream_ReadLine( s );
 435         char **ppsz_new;
 436
 437         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 438             break;
 439
 440         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 441         if( ppsz_new == NULL )
 442         {
 443             free( psz );
 444             break;
 445         }
 446         lines = ppsz_new;
 447         lines[n++] = psz;
 448     }
 449
 450     txt->i_line_count = n;
 451     txt->i_line       = 0;
 452     txt->line         = lines;
 453
 454     return VLC_SUCCESS;
 455 }
 456
 457 static void TextUnload( text_t *txt )
 458 {
 459     int i;
 460
 461     for( i = 0; i < txt->i_line_count; i++ )
 462         free( txt->line[i] );
 463
 464     free( txt->line );
 465     txt->i_line       = 0;
 466     txt->i_line_count = 0;
 467 }
 468
 469 static char *TextGetLine( text_t *txt )
 470 {
 471     if( txt->i_line >= txt->i_line_count )
 472         return( NULL );
 473
 474     return txt->line[txt->i_line++];
 475 }
 476
 477 static int ParseVobSubIDX( demux_t *p_demux )
 478 {
 479     demux_sys_t *p_sys = p_demux->p_sys;
 480     text_t      *txt = &p_sys->txt;
 481     char        *line;
 482     vobsub_track_t *current_tk = NULL;
 483
 484     for( ;; )
 485     {
 486         if( ( line = TextGetLine( txt ) ) == NULL )
 487         {
 488             return( VLC_EGENERIC );
 489         }
 490
 491         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 492         {
 493             continue;
 494         }
 495         else if( !strncmp( "size:", line, 5 ) )
 496         {
 497             /* Store the original size of the video */
 498             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 499                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 500             {
 501                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 502             }
 503             else
 504             {
 505                 msg_Warn( p_demux, "reading original frame size failed" );
 506             }
 507         }
 508         else if( !strncmp( "palette:", line, 8 ) )
 509         {
 510             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 511             {
 512                 p_sys->b_palette = true;
 513                 msg_Dbg( p_demux, "vobsub palette read" );
 514             }
 515             else
 516             {
 517                 msg_Warn( p_demux, "reading original palette failed" );
 518             }
 519         }
 520         else if( !strncmp( "id:", line, 3 ) )
 521         {
 522             char language[3];
 523             int i_track_id;
 524             es_format_t fmt;
 525
 526             /* Lets start a new track */
 527             if( sscanf( line, "id: %2s, index: %d",
 528                         language, &i_track_id ) == 2 )
 529             {
 530                 p_sys->i_tracks++;
 531                 p_sys->track = xrealloc( p_sys->track,
 532                           sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 533                 language[2] = '\0';
 534
 535                 /* Init the track */
 536                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
 537                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
 538                 current_tk->i_current_subtitle = 0;
 539                 current_tk->i_subtitles = 0;
 540                 current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );;
 541                 current_tk->i_track_id = i_track_id;
 542                 current_tk->i_delay = (int64_t)0;
 543
 544                 es_format_Init( &fmt, SPU_ES, VLC_CODEC_SPU );
 545                 fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 546                 fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 547                 fmt.psz_language = language;
 548                 if( p_sys->b_palette )
 549                 {
 550                     fmt.subs.spu.palette[0] = 0xBeef;
 551                     memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 552                 }
 553
 554                 current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 555                 msg_Dbg( p_demux, "new vobsub track detected" );
 556             }
 557             else
 558             {
 559                 msg_Warn( p_demux, "reading new track failed" );
 560             }
 561         }
 562         else if( !strncmp( line, "timestamp:", 10 ) )
 563         {
 564             /*
 565              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 566              * loc is the hex location of the spu in the .sub file
 567              */
 568             int h, m, s, ms, count, loc = 0;
 569             int i_sign = 1;
 570             int64_t i_start, i_location = 0;
 571
 572             if( p_sys->i_tracks > 0 &&
 573                 sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 574                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 575             {
 576                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 577                 subtitle_t *current_sub;
 578
 579                 if( line[count-3] == '-' )
 580                 {
 581                     i_sign = -1;
 582                     h = -h;
 583                 }
 584                 i_start = (int64_t) ( h * 3600*1000 +
 585                             m * 60*1000 +
 586                             s * 1000 +
 587                             ms ) * 1000;
 588                 i_location = loc;
 589
 590                 current_tk->i_subtitles++;
 591                 current_tk->p_subtitles =
 592                     xrealloc( current_tk->p_subtitles,
 593                       sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 594                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 595
 596                 current_sub->i_start = i_start * i_sign;
 597                 current_sub->i_start += current_tk->i_delay;
 598                 current_sub->i_vobsub_location = i_location;
 599             }
 600             else
 601             {
 602                 msg_Warn( p_demux, "reading timestamp failed" );
 603             }
 604         }
 605         else if( !strncasecmp( line, "delay:", 6 ) )
 606         {
 607             /*
 608              * delay: [sign]hh:mm:ss:mss
 609              */
 610             int h, m, s, ms, count = 0;
 611             int i_sign = 1;
 612             int64_t i_gap = 0;
 613
 614             if( p_sys->i_tracks > 0 &&
 615                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 616                         &h, &count, &m, &s, &ms ) >= 4 )
 617             {
 618                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 619                 if( line[count-3] == '-' )
 620                 {
 621                     i_sign = -1;
 622                     h = -h;
 623                 }
 624                 i_gap = (int64_t) ( h * 3600*1000 +
 625                             m * 60*1000 +
 626                             s * 1000 +
 627                             ms ) * 1000;
 628
 629                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 630                 msg_Dbg( p_demux, "sign: %+d gap: %+"PRId64" global delay: %+"PRId64"",
 631                          i_sign, i_gap, current_tk->i_delay );
 632             }
 633             else
 634             {
 635                 msg_Warn( p_demux, "reading delay failed" );
 636             }
 637         }
 638     }
 639     return( 0 );
 640 }
 641
 642 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 643 {
 644     demux_sys_t *p_sys = p_demux->p_sys;
 645     uint8_t     *p = p_bk->p_buffer;
 646     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 647     int i;
 648
 649     while( p + 6 < p_end )
 650     {
 651         int i_size = ps_pkt_size( p, p_end - p );
 652         block_t *p_pkt;
 653         int      i_id;
 654         int      i_spu;
 655
 656         if( i_size <= 0 )
 657             break;
 658
 659         if( i_size > p_end - p )
 660         {
 661             msg_Warn( p_demux, "broken PES size" );
 662             break;
 663         }
 664
 665         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 666         {
 667             msg_Warn( p_demux, "invalid PES" );
 668             break;
 669         }
 670
 671         if( p[3] != 0xbd )
 672         {
 673             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 674             p += i_size;
 675             continue;
 676         }
 677
 678         /* Create a block */
 679         p_pkt = block_New( p_demux, i_size );
 680         memcpy( p_pkt->p_buffer, p, i_size);
 681         p += i_size;
 682
 683         i_id = ps_pkt_id( p_pkt );
 684         if( (i_id&0xffe0) != 0xbd20 ||
 685             ps_pkt_parse_pes( p_pkt, 1 ) )
 686         {
 687             block_Release( p_pkt );
 688             continue;
 689         }
 690         i_spu = i_id&0x1f;
 691         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 692
 693         for( i = 0; i < p_sys->i_tracks; i++ )
 694         {
 695             vobsub_track_t *p_tk = &p_sys->track[i];
 696
 697             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 698             p_pkt->i_length = 0;
 699
 700             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 701             {
 702                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 703                 p_bk->i_pts = VLC_TS_INVALID;     /*only first packet has a pts */
 704                 break;
 705             }
 706         }
 707         if( i >= p_sys->i_tracks )
 708         {
 709             block_Release( p_pkt );
 710         }
 711     }
 712
 713     return VLC_SUCCESS;
 714 }
 715