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 <assert.h>
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_memory.h>
  37
  38 #include <errno.h>
  39 #include <sys/types.h>
  40 #include <limits.h>
  41
  42 #include <vlc_demux.h>
  43 #include <vlc_charset.h>
  44
  45 #include "ps.h"
  46 #include "vobsub.h"
  47
  48 #define MAX_LINE 8192
  49
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 static int  Open ( vlc_object_t *p_this );
  54 static void Close( vlc_object_t *p_this );
  55
  56 vlc_module_begin ()
  57     set_description( N_("Vobsub subtitles parser") )
  58     set_category( CAT_INPUT )
  59     set_subcategory( SUBCAT_INPUT_DEMUX )
  60     set_capability( "demux", 1 )
  61
  62     set_callbacks( Open, Close )
  63
  64     add_shortcut( "vobsub" )
  65     add_shortcut( "subtitle" )
  66 vlc_module_end ()
  67
  68 /*****************************************************************************
  69  * Prototypes:
  70  *****************************************************************************/
  71
  72 typedef struct
  73 {
  74     int     i_line_count;
  75     int     i_line;
  76     char    **line;
  77 } text_t;
  78 static int  TextLoad( text_t *, stream_t *s );
  79 static void TextUnload( text_t * );
  80
  81 typedef struct
  82 {
  83     int64_t i_start;
  84     int     i_vobsub_location;
  85 } subtitle_t;
  86
  87 typedef struct
  88 {
  89     es_format_t fmt;
  90     es_out_id_t *p_es;
  91     int         i_track_id;
  92
  93     int         i_current_subtitle;
  94     int         i_subtitles;
  95     subtitle_t  *p_subtitles;
  96
  97     int64_t     i_delay;
  98 } vobsub_track_t;
  99
 100 struct demux_sys_t
 101 {
 102     int64_t     i_next_demux_date;
 103     int64_t     i_length;
 104
 105     text_t      txt;
 106     stream_t    *p_vobsub_stream;
 107
 108     /* all tracks */
 109     int            i_tracks;
 110     vobsub_track_t *track;
 111
 112     int         i_original_frame_width;
 113     int         i_original_frame_height;
 114     bool  b_palette;
 115     uint32_t    palette[16];
 116 };
 117
 118 static int Demux( demux_t * );
 119 static int Control( demux_t *, int, va_list );
 120
 121 static int ParseVobSubIDX( demux_t * );
 122 static int DemuxVobSub( demux_t *, block_t *);
 123
 124 /*****************************************************************************
 125  * Module initializer
 126  *****************************************************************************/
 127 static int Open ( vlc_object_t *p_this )
 128 {
 129     demux_t     *p_demux = (demux_t*)p_this;
 130     demux_sys_t *p_sys;
 131     char *psz_vobname, *s;
 132     int i_len;
 133
 134     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 135     {
 136         if( !strcasestr( s, "# VobSub index file" ) )
 137         {
 138             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 139             free( s );
 140             if( stream_Seek( p_demux->s, 0 ) )
 141             {
 142                 msg_Warn( p_demux, "failed to rewind" );
 143             }
 144             return VLC_EGENERIC;
 145         }
 146         free( s );
 147
 148     }
 149     else
 150     {
 151         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 152         return VLC_EGENERIC;
 153     }
 154
 155     p_demux->pf_demux = Demux;
 156     p_demux->pf_control = Control;
 157     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 158     assert( p_sys );
 159     p_sys->i_length = 0;
 160     p_sys->p_vobsub_stream = NULL;
 161     p_sys->i_tracks = 0;
 162     p_sys->track = (vobsub_track_t *)malloc( sizeof( vobsub_track_t ) );
 163     assert( p_sys->track );
 164     p_sys->i_original_frame_width = -1;
 165     p_sys->i_original_frame_height = -1;
 166     p_sys->b_palette = false;
 167     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 168
 169     /* Load the whole file */
 170     TextLoad( &p_sys->txt, p_demux->s );
 171
 172     /* Parse it */
 173     ParseVobSubIDX( p_demux );
 174
 175     /* Unload */
 176     TextUnload( &p_sys->txt );
 177
 178     /* Find the total length of the vobsubs */
 179     if( p_sys->i_tracks > 0 )
 180     {
 181         int i;
 182         for( i = 0; i < p_sys->i_tracks; i++ )
 183         {
 184             if( p_sys->track[i].i_subtitles > 1 )
 185             {
 186                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 187                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 188             }
 189         }
 190     }
 191
 192     if( asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_path ) == -1 )
 193     {
 194         free( p_sys );
 195         return VLC_EGENERIC;
 196     }
 197     i_len = strlen( psz_vobname );
 198     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 199
 200     /* open file */
 201     p_sys->p_vobsub_stream = stream_UrlNew( p_demux, psz_vobname );
 202     if( p_sys->p_vobsub_stream == NULL )
 203     {
 204         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 205                  psz_vobname );
 206         free( psz_vobname );
 207         free( p_sys );
 208         return VLC_EGENERIC;
 209     }
 210     free( psz_vobname );
 211
 212     return VLC_SUCCESS;
 213 }
 214
 215 /*****************************************************************************
 216  * Close: Close subtitle demux
 217  *****************************************************************************/
 218 static void Close( vlc_object_t *p_this )
 219 {
 220     int i;
 221     demux_t *p_demux = (demux_t*)p_this;
 222     demux_sys_t *p_sys = p_demux->p_sys;
 223
 224     /* Clean all subs from all tracks */
 225     for( i = 0; i < p_sys->i_tracks; i++ )
 226         free( p_sys->track[i].p_subtitles );
 227
 228     free( p_sys->track );
 229
 230     if( p_sys->p_vobsub_stream )
 231         stream_Delete( p_sys->p_vobsub_stream );
 232
 233     free( p_sys );
 234 }
 235
 236 /*****************************************************************************
 237  * Control:
 238  *****************************************************************************/
 239 static int Control( demux_t *p_demux, int i_query, va_list args )
 240 {
 241     demux_sys_t *p_sys = p_demux->p_sys;
 242     int64_t *pi64, i64;
 243     int i;
 244     double *pf, f;
 245
 246     switch( i_query )
 247     {
 248         case DEMUX_GET_LENGTH:
 249             pi64 = (int64_t*)va_arg( args, int64_t * );
 250             *pi64 = (int64_t) p_sys->i_length;
 251             return VLC_SUCCESS;
 252
 253         case DEMUX_GET_TIME:
 254             pi64 = (int64_t*)va_arg( args, int64_t * );
 255             for( i = 0; i < p_sys->i_tracks; i++ )
 256             {
 257                 bool b_selected;
 258                 /* Check the ES is selected */
 259                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 260                                 p_sys->track[i].p_es, &b_selected );
 261                 if( b_selected ) break;
 262             }
 263             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 264             {
 265                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 266                 return VLC_SUCCESS;
 267             }
 268             return VLC_EGENERIC;
 269
 270         case DEMUX_SET_TIME:
 271             i64 = (int64_t)va_arg( args, int64_t );
 272             for( i = 0; i < p_sys->i_tracks; i++ )
 273             {
 274                 p_sys->track[i].i_current_subtitle = 0;
 275                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 276                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 277                 {
 278                     p_sys->track[i].i_current_subtitle++;
 279                 }
 280
 281                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 282                     return VLC_EGENERIC;
 283             }
 284             return VLC_SUCCESS;
 285
 286         case DEMUX_GET_POSITION:
 287             pf = (double*)va_arg( args, double * );
 288             for( i = 0; i < p_sys->i_tracks; i++ )
 289             {
 290                 bool b_selected;
 291                 /* Check the ES is selected */
 292                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 293                                 p_sys->track[i].p_es, &b_selected );
 294                 if( b_selected ) break;
 295             }
 296             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 297             {
 298                 *pf = 1.0;
 299             }
 300             else if( p_sys->track[i].i_subtitles > 0 )
 301             {
 302                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 303                       (double)p_sys->i_length;
 304             }
 305             else
 306             {
 307                 *pf = 0.0;
 308             }
 309             return VLC_SUCCESS;
 310
 311         case DEMUX_SET_POSITION:
 312             f = (double)va_arg( args, double );
 313             i64 = (int64_t) f * p_sys->i_length;
 314
 315             for( i = 0; i < p_sys->i_tracks; i++ )
 316             {
 317                 p_sys->track[i].i_current_subtitle = 0;
 318                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 319                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 320                 {
 321                     p_sys->track[i].i_current_subtitle++;
 322                 }
 323                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 324                     return VLC_EGENERIC;
 325             }
 326             return VLC_SUCCESS;
 327
 328         case DEMUX_SET_NEXT_DEMUX_TIME:
 329             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 330             return VLC_SUCCESS;
 331
 332         case DEMUX_GET_FPS:
 333         case DEMUX_GET_META:
 334         case DEMUX_GET_TITLE_INFO:
 335         case DEMUX_HAS_UNSUPPORTED_META:
 336         case DEMUX_GET_ATTACHMENTS:
 337         case DEMUX_CAN_RECORD:
 338             return VLC_EGENERIC;
 339
 340         default:
 341             msg_Warn( p_demux, "unknown query in subtitle control" );
 342             return VLC_EGENERIC;
 343     }
 344 }
 345
 346 /*****************************************************************************
 347  * Demux: Send subtitle to decoder
 348  *****************************************************************************/
 349 static int Demux( demux_t *p_demux )
 350 {
 351     demux_sys_t *p_sys = p_demux->p_sys;
 352     int64_t i_maxdate;
 353     int i, i_read;
 354
 355     for( i = 0; i < p_sys->i_tracks; i++ )
 356     {
 357 #define tk p_sys->track[i]
 358         if( tk.i_current_subtitle >= tk.i_subtitles )
 359             continue;
 360
 361         i_maxdate = p_sys->i_next_demux_date;
 362         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 363         {
 364             /* Should not happen */
 365             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 366         }
 367
 368         while( tk.i_current_subtitle < tk.i_subtitles &&
 369                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 370         {
 371             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 372             block_t *p_block;
 373             int i_size = 0;
 374
 375             /* first compute SPU size */
 376             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 377             {
 378                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 379             }
 380             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 381
 382             /* Seek at the right place */
 383             if( stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 384             {
 385                 msg_Warn( p_demux,
 386                           "cannot seek in the VobSub to the correct time %d", i_pos );
 387                 tk.i_current_subtitle++;
 388                 continue;
 389             }
 390
 391             /* allocate a packet */
 392             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 393             {
 394                 tk.i_current_subtitle++;
 395                 continue;
 396             }
 397
 398             /* read data */
 399             i_read = stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 400             if( i_read <= 6 )
 401             {
 402                 block_Release( p_block );
 403                 tk.i_current_subtitle++;
 404                 continue;
 405             }
 406             p_block->i_buffer = i_read;
 407
 408             /* pts */
 409             p_block->i_pts = tk.p_subtitles[tk.i_current_subtitle].i_start;
 410
 411             /* demux this block */
 412             DemuxVobSub( p_demux, p_block );
 413
 414             tk.i_current_subtitle++;
 415         }
 416 #undef tk
 417     }
 418
 419     /* */
 420     p_sys->i_next_demux_date = 0;
 421
 422     return 1;
 423 }
 424
 425 static int TextLoad( text_t *txt, stream_t *s )
 426 {
 427     char **lines = NULL;
 428     size_t n = 0;
 429
 430     /* load the complete file */
 431     for( ;; )
 432     {
 433         char *psz = stream_ReadLine( s );
 434         char **ppsz_new;
 435
 436         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 437             break;
 438
 439         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 440         if( ppsz_new == NULL )
 441         {
 442             free( psz );
 443             break;
 444         }
 445         lines = ppsz_new;
 446         lines[n++] = psz;
 447     }
 448
 449     txt->i_line_count = n;
 450     txt->i_line       = 0;
 451     txt->line         = lines;
 452
 453     return VLC_SUCCESS;
 454 }
 455
 456 static void TextUnload( text_t *txt )
 457 {
 458     int i;
 459
 460     for( i = 0; i < txt->i_line_count; i++ )
 461         free( txt->line[i] );
 462
 463     free( txt->line );
 464     txt->i_line       = 0;
 465     txt->i_line_count = 0;
 466 }
 467
 468 static char *TextGetLine( text_t *txt )
 469 {
 470     if( txt->i_line >= txt->i_line_count )
 471         return( NULL );
 472
 473     return txt->line[txt->i_line++];
 474 }
 475
 476 static int ParseVobSubIDX( demux_t *p_demux )
 477 {
 478     demux_sys_t *p_sys = p_demux->p_sys;
 479     text_t      *txt = &p_sys->txt;
 480     char        *line;
 481     vobsub_track_t *current_tk = NULL;
 482
 483     for( ;; )
 484     {
 485         if( ( line = TextGetLine( txt ) ) == NULL )
 486         {
 487             return( VLC_EGENERIC );
 488         }
 489
 490         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 491         {
 492             continue;
 493         }
 494         else if( !strncmp( "size:", line, 5 ) )
 495         {
 496             /* Store the original size of the video */
 497             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 498                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 499             {
 500                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 501             }
 502             else
 503             {
 504                 msg_Warn( p_demux, "reading original frame size failed" );
 505             }
 506         }
 507         else if( !strncmp( "palette:", line, 8 ) )
 508         {
 509             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 510             {
 511                 p_sys->b_palette = true;
 512                 msg_Dbg( p_demux, "vobsub palette read" );
 513             }
 514             else
 515             {
 516                 msg_Warn( p_demux, "reading original palette failed" );
 517             }
 518         }
 519         else if( !strncmp( "id:", line, 3 ) )
 520         {
 521             char language[3];
 522             int i_track_id;
 523             es_format_t fmt;
 524
 525             /* Lets start a new track */
 526             if( sscanf( line, "id: %2s, index: %d",
 527                         language, &i_track_id ) == 2 )
 528             {
 529                 p_sys->i_tracks++;
 530                 p_sys->track = realloc_or_free( p_sys->track,
 531                           sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 532                 assert( p_sys->track );
 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 = malloc( sizeof( subtitle_t ) );;
 541                 assert( current_tk->p_subtitles );
 542                 current_tk->i_track_id = i_track_id;
 543                 current_tk->i_delay = (int64_t)0;
 544
 545                 es_format_Init( &fmt, SPU_ES, VLC_CODEC_SPU );
 546                 fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 547                 fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 548                 fmt.psz_language = language;
 549                 if( p_sys->b_palette )
 550                 {
 551                     fmt.subs.spu.palette[0] = 0xBeef;
 552                     memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 553                 }
 554
 555                 current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 556                 msg_Dbg( p_demux, "new vobsub track detected" );
 557             }
 558             else
 559             {
 560                 msg_Warn( p_demux, "reading new track failed" );
 561             }
 562         }
 563         else if( !strncmp( line, "timestamp:", 10 ) )
 564         {
 565             /*
 566              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 567              * loc is the hex location of the spu in the .sub file
 568              */
 569             int h, m, s, ms, count, loc = 0;
 570             int i_sign = 1;
 571             int64_t i_start, i_location = 0;
 572
 573             if( p_sys->i_tracks > 0 &&
 574                 sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 575                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 576             {
 577                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 578                 subtitle_t *current_sub;
 579
 580                 if( line[count-3] == '-' )
 581                 {
 582                     i_sign = -1;
 583                     h = -h;
 584                 }
 585                 i_start = (int64_t) ( h * 3600*1000 +
 586                             m * 60*1000 +
 587                             s * 1000 +
 588                             ms ) * 1000;
 589                 i_location = loc;
 590
 591                 current_tk->i_subtitles++;
 592                 current_tk->p_subtitles =
 593                     realloc_or_free( current_tk->p_subtitles,
 594                       sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 595                 assert( current_tk->p_subtitles );
 596                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 597
 598                 current_sub->i_start = i_start * i_sign;
 599                 current_sub->i_start += current_tk->i_delay;
 600                 current_sub->i_vobsub_location = i_location;
 601             }
 602             else
 603             {
 604                 msg_Warn( p_demux, "reading timestamp failed" );
 605             }
 606         }
 607         else if( !strncasecmp( line, "delay:", 6 ) )
 608         {
 609             /*
 610              * delay: [sign]hh:mm:ss:mss
 611              */
 612             int h, m, s, ms, count = 0;
 613             int i_sign = 1;
 614             int64_t i_gap = 0;
 615
 616             if( p_sys->i_tracks > 0 &&
 617                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 618                         &h, &count, &m, &s, &ms ) >= 4 )
 619             {
 620                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 621                 if( line[count-3] == '-' )
 622                 {
 623                     i_sign = -1;
 624                     h = -h;
 625                 }
 626                 i_gap = (int64_t) ( h * 3600*1000 +
 627                             m * 60*1000 +
 628                             s * 1000 +
 629                             ms ) * 1000;
 630
 631                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 632                 msg_Dbg( p_demux, "sign: %+d gap: %+"PRId64" global delay: %+"PRId64"",
 633                          i_sign, i_gap, current_tk->i_delay );
 634             }
 635             else
 636             {
 637                 msg_Warn( p_demux, "reading delay failed" );
 638             }
 639         }
 640     }
 641     return( 0 );
 642 }
 643
 644 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 645 {
 646     demux_sys_t *p_sys = p_demux->p_sys;
 647     uint8_t     *p = p_bk->p_buffer;
 648     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 649     int i;
 650
 651     while( p + 6 < p_end )
 652     {
 653         int i_size = ps_pkt_size( p, p_end - p );
 654         block_t *p_pkt;
 655         int      i_id;
 656         int      i_spu;
 657
 658         if( i_size <= 0 )
 659             break;
 660
 661         if( i_size > p_end - p )
 662         {
 663             msg_Warn( p_demux, "broken PES size" );
 664             break;
 665         }
 666
 667         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 668         {
 669             msg_Warn( p_demux, "invalid PES" );
 670             break;
 671         }
 672
 673         if( p[3] != 0xbd )
 674         {
 675             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 676             p += i_size;
 677             continue;
 678         }
 679
 680         /* Create a block */
 681         p_pkt = block_New( p_demux, i_size );
 682         memcpy( p_pkt->p_buffer, p, i_size);
 683         p += i_size;
 684
 685         i_id = ps_pkt_id( p_pkt );
 686         if( (i_id&0xffe0) != 0xbd20 ||
 687             ps_pkt_parse_pes( p_pkt, 1 ) )
 688         {
 689             block_Release( p_pkt );
 690             continue;
 691         }
 692         i_spu = i_id&0x1f;
 693         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 694
 695         for( i = 0; i < p_sys->i_tracks; i++ )
 696         {
 697             vobsub_track_t *p_tk = &p_sys->track[i];
 698
 699             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 700             p_pkt->i_length = 0;
 701
 702             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 703             {
 704                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 705                 p_bk->i_pts = 0;     /*only first packet has a pts */
 706                 break;
 707             }
 708         }
 709         if( i >= p_sys->i_tracks )
 710         {
 711             block_Release( p_pkt );
 712         }
 713     }
 714
 715     return VLC_SUCCESS;
 716 }
 717