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
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <limits.h>
  34
  35 #include <vlc_common.h>
  36 #include <vlc_plugin.h>
  37 #include <vlc_demux.h>
  38
  39 #include "ps.h"
  40 #include "vobsub.h"
  41
  42 /*****************************************************************************
  43  * Module descriptor
  44  *****************************************************************************/
  45 static int  Open ( vlc_object_t *p_this );
  46 static void Close( vlc_object_t *p_this );
  47
  48 vlc_module_begin ()
  49     set_description( N_("Vobsub subtitles parser") )
  50     set_category( CAT_INPUT )
  51     set_subcategory( SUBCAT_INPUT_DEMUX )
  52     set_capability( "demux", 1 )
  53
  54     set_callbacks( Open, Close )
  55
  56     add_shortcut( "vobsub", "subtitle" )
  57 vlc_module_end ()
  58
  59 /*****************************************************************************
  60  * Prototypes:
  61  *****************************************************************************/
  62
  63 typedef struct
  64 {
  65     int     i_line_count;
  66     int     i_line;
  67     char    **line;
  68 } text_t;
  69
  70 typedef struct
  71 {
  72     int64_t i_start;
  73     int     i_vobsub_location;
  74 } subtitle_t;
  75
  76 typedef struct
  77 {
  78     es_format_t fmt;
  79     es_out_id_t *p_es;
  80     int         i_track_id;
  81
  82     int         i_current_subtitle;
  83     int         i_subtitles;
  84     subtitle_t  *p_subtitles;
  85
  86     int64_t     i_delay;
  87 } vobsub_track_t;
  88
  89 struct demux_sys_t
  90 {
  91     int64_t        i_next_demux_date;
  92     int64_t        i_length;
  93
  94     text_t         txt;
  95     stream_t       *p_vobsub_stream;
  96
  97     /* all tracks */
  98     int            i_tracks;
  99     vobsub_track_t *track;
 100
 101     int            i_original_frame_width;
 102     int            i_original_frame_height;
 103     bool           b_palette;
 104     uint32_t       palette[16];
 105 };
 106
 107
 108 static int Demux( demux_t * );
 109 static int Control( demux_t *, int, va_list );
 110
 111 static int  TextLoad( text_t *, stream_t *s );
 112 static void TextUnload( text_t * );
 113 static int ParseVobSubIDX( demux_t * );
 114 static int DemuxVobSub( demux_t *, block_t *);
 115
 116 /*****************************************************************************
 117  * Module initializer
 118  *****************************************************************************/
 119 static int Open ( vlc_object_t *p_this )
 120 {
 121     demux_t     *p_demux = (demux_t*)p_this;
 122     demux_sys_t *p_sys;
 123     char *psz_vobname, *s;
 124     int i_len;
 125
 126     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 127     {
 128         if( !strcasestr( s, "# VobSub index file" ) )
 129         {
 130             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 131             free( s );
 132             if( stream_Seek( p_demux->s, 0 ) )
 133             {
 134                 msg_Warn( p_demux, "failed to rewind" );
 135             }
 136             return VLC_EGENERIC;
 137         }
 138         free( s );
 139     }
 140     else
 141     {
 142         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 143         return VLC_EGENERIC;
 144     }
 145
 146     /* */
 147     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 148     if( unlikely( !p_sys ) )
 149         return VLC_ENOMEM;
 150
 151     p_sys->i_length = 0;
 152     p_sys->p_vobsub_stream = NULL;
 153     p_sys->i_tracks = 0;
 154     p_sys->track = malloc( sizeof( vobsub_track_t ) );
 155     if( unlikely( !p_sys->track ) )
 156         goto error;
 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         for( int i = 0; i < p_sys->i_tracks; i++ )
 175         {
 176             if( p_sys->track[i].i_subtitles > 1 )
 177             {
 178                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 179                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 180             }
 181         }
 182     }
 183
 184     if( asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_location ) == -1 )
 185         goto error;
 186
 187     i_len = strlen( psz_vobname );
 188     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 189
 190     /* open file */
 191     p_sys->p_vobsub_stream = stream_UrlNew( p_demux, psz_vobname );
 192     if( p_sys->p_vobsub_stream == NULL )
 193     {
 194         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 195                  psz_vobname );
 196         free( psz_vobname );
 197         goto error;
 198     }
 199     free( psz_vobname );
 200
 201     p_demux->pf_demux = Demux;
 202     p_demux->pf_control = Control;
 203
 204     return VLC_SUCCESS;
 205
 206 error:
 207     /* Clean all subs from all tracks */
 208     for( int i = 0; i < p_sys->i_tracks; i++ )
 209         free( p_sys->track[i].p_subtitles );
 210     free( p_sys->track );
 211     free( p_sys );
 212
 213     return VLC_EGENERIC;
 214 }
 215
 216 /*****************************************************************************
 217  * Close: Close subtitle demux
 218  *****************************************************************************/
 219 static void Close( vlc_object_t *p_this )
 220 {
 221     demux_t *p_demux = (demux_t*)p_this;
 222     demux_sys_t *p_sys = p_demux->p_sys;
 223
 224     if( p_sys->p_vobsub_stream )
 225         stream_Delete( p_sys->p_vobsub_stream );
 226
 227     /* Clean all subs from all tracks */
 228     for( int i = 0; i < p_sys->i_tracks; i++ )
 229         free( p_sys->track[i].p_subtitles );
 230     free( p_sys->track );
 231     free( p_sys );
 232 }
 233
 234 /*****************************************************************************
 235  * Control:
 236  *****************************************************************************/
 237 static int Control( demux_t *p_demux, int i_query, va_list args )
 238 {
 239     demux_sys_t *p_sys = p_demux->p_sys;
 240     int64_t *pi64, i64;
 241     int i;
 242     double *pf, f;
 243
 244     switch( i_query )
 245     {
 246         case DEMUX_GET_LENGTH:
 247             pi64 = (int64_t*)va_arg( args, int64_t * );
 248             *pi64 = (int64_t) p_sys->i_length;
 249             return VLC_SUCCESS;
 250
 251         case DEMUX_GET_TIME:
 252             pi64 = (int64_t*)va_arg( args, int64_t * );
 253             for( i = 0; i < p_sys->i_tracks; i++ )
 254             {
 255                 bool b_selected;
 256                 /* Check the ES is selected */
 257                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 258                                 p_sys->track[i].p_es, &b_selected );
 259                 if( b_selected ) break;
 260             }
 261             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 262             {
 263                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 264                 return VLC_SUCCESS;
 265             }
 266             return VLC_EGENERIC;
 267
 268         case DEMUX_SET_TIME:
 269             i64 = (int64_t)va_arg( args, int64_t );
 270             for( i = 0; i < p_sys->i_tracks; i++ )
 271             {
 272                 p_sys->track[i].i_current_subtitle = 0;
 273                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 274                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 275                 {
 276                     p_sys->track[i].i_current_subtitle++;
 277                 }
 278
 279                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 280                     return VLC_EGENERIC;
 281             }
 282             return VLC_SUCCESS;
 283
 284         case DEMUX_GET_POSITION:
 285             pf = (double*)va_arg( args, double * );
 286             for( i = 0; i < p_sys->i_tracks; i++ )
 287             {
 288                 bool b_selected;
 289                 /* Check the ES is selected */
 290                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 291                                 p_sys->track[i].p_es, &b_selected );
 292                 if( b_selected ) break;
 293             }
 294             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 295             {
 296                 *pf = 1.0;
 297             }
 298             else if( p_sys->track[i].i_subtitles > 0 )
 299             {
 300                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 301                       (double)p_sys->i_length;
 302             }
 303             else
 304             {
 305                 *pf = 0.0;
 306             }
 307             return VLC_SUCCESS;
 308
 309         case DEMUX_SET_POSITION:
 310             f = (double)va_arg( args, double );
 311             i64 = (int64_t) f * p_sys->i_length;
 312
 313             for( i = 0; i < p_sys->i_tracks; i++ )
 314             {
 315                 p_sys->track[i].i_current_subtitle = 0;
 316                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 317                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 318                 {
 319                     p_sys->track[i].i_current_subtitle++;
 320                 }
 321                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 322                     return VLC_EGENERIC;
 323             }
 324             return VLC_SUCCESS;
 325
 326         case DEMUX_SET_NEXT_DEMUX_TIME:
 327             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 328             return VLC_SUCCESS;
 329
 330         case DEMUX_GET_PTS_DELAY:
 331         case DEMUX_GET_FPS:
 332         case DEMUX_GET_META:
 333         case DEMUX_GET_TITLE_INFO:
 334         case DEMUX_HAS_UNSUPPORTED_META:
 335         case DEMUX_GET_ATTACHMENTS:
 336         case DEMUX_CAN_RECORD:
 337             return VLC_EGENERIC;
 338
 339         default:
 340             msg_Warn( p_demux, "unknown query in subtitle control" );
 341             return VLC_EGENERIC;
 342     }
 343 }
 344
 345 /*****************************************************************************
 346  * Demux: Send subtitle to decoder
 347  *****************************************************************************/
 348 static int Demux( demux_t *p_demux )
 349 {
 350     demux_sys_t *p_sys = p_demux->p_sys;
 351     int64_t i_maxdate;
 352     int i_read;
 353
 354     for( int i = 0; i < p_sys->i_tracks; i++ )
 355     {
 356 #define tk p_sys->track[i]
 357         if( tk.i_current_subtitle >= tk.i_subtitles )
 358             continue;
 359
 360         i_maxdate = p_sys->i_next_demux_date;
 361         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 362         {
 363             /* Should not happen */
 364             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 365         }
 366
 367         while( tk.i_current_subtitle < tk.i_subtitles &&
 368                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 369         {
 370             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 371             block_t *p_block;
 372             int i_size = 0;
 373
 374             /* first compute SPU size */
 375             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 376             {
 377                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 378             }
 379             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 380
 381             /* Seek at the right place */
 382             if( stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 383             {
 384                 msg_Warn( p_demux,
 385                           "cannot seek in the VobSub to the correct time %d", i_pos );
 386                 tk.i_current_subtitle++;
 387                 continue;
 388             }
 389
 390             /* allocate a packet */
 391             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 392             {
 393                 tk.i_current_subtitle++;
 394                 continue;
 395             }
 396
 397             /* read data */
 398             i_read = stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 399             if( i_read <= 6 )
 400             {
 401                 block_Release( p_block );
 402                 tk.i_current_subtitle++;
 403                 continue;
 404             }
 405             p_block->i_buffer = i_read;
 406
 407             /* pts */
 408             p_block->i_pts = VLC_TS_0 + tk.p_subtitles[tk.i_current_subtitle].i_start;
 409
 410             /* demux this block */
 411             DemuxVobSub( p_demux, p_block );
 412
 413             tk.i_current_subtitle++;
 414         }
 415 #undef tk
 416     }
 417
 418     /* */
 419     p_sys->i_next_demux_date = 0;
 420
 421     return 1;
 422 }
 423
 424 static int TextLoad( text_t *txt, stream_t *s )
 425 {
 426     char **lines = NULL;
 427     size_t n = 0;
 428
 429     /* load the complete file */
 430     for( ;; )
 431     {
 432         char *psz = stream_ReadLine( s );
 433         char **ppsz_new;
 434
 435         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 436             break;
 437
 438         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 439         if( ppsz_new == NULL )
 440         {
 441             free( psz );
 442             break;
 443         }
 444         lines = ppsz_new;
 445         lines[n++] = psz;
 446     }
 447
 448     txt->i_line_count = n;
 449     txt->i_line       = 0;
 450     txt->line         = lines;
 451
 452     return VLC_SUCCESS;
 453 }
 454
 455 static void TextUnload( text_t *txt )
 456 {
 457     for( int i = 0; i < txt->i_line_count; i++ )
 458         free( txt->line[i] );
 459     free( txt->line );
 460
 461     txt->i_line       = 0;
 462     txt->i_line_count = 0;
 463 }
 464
 465 static char *TextGetLine( text_t *txt )
 466 {
 467     if( txt->i_line >= txt->i_line_count )
 468         return( NULL );
 469
 470     return txt->line[txt->i_line++];
 471 }
 472
 473 static int ParseVobSubIDX( demux_t *p_demux )
 474 {
 475     demux_sys_t *p_sys = p_demux->p_sys;
 476     text_t      *txt = &p_sys->txt;
 477     char        *line;
 478     vobsub_track_t *current_tk = NULL;
 479
 480     for( ;; )
 481     {
 482         if( ( line = TextGetLine( txt ) ) == NULL )
 483         {
 484             return( VLC_EGENERIC );
 485         }
 486
 487         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 488         {
 489             continue;
 490         }
 491         else if( !strncmp( "size:", line, 5 ) )
 492         {
 493             /* Store the original size of the video */
 494             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 495                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 496             {
 497                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 498             }
 499             else
 500             {
 501                 msg_Warn( p_demux, "reading original frame size failed" );
 502             }
 503         }
 504         else if( !strncmp( "palette:", line, 8 ) )
 505         {
 506             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 507             {
 508                 p_sys->b_palette = true;
 509                 msg_Dbg( p_demux, "vobsub palette read" );
 510             }
 511             else
 512             {
 513                 msg_Warn( p_demux, "reading original palette failed" );
 514             }
 515         }
 516         else if( !strncmp( "id:", line, 3 ) )
 517         {
 518             char language[33]; /* Usually 2 or 3 letters, sometimes more.
 519                                   Spec (or lack of) doesn't define any limit */
 520             int i_track_id;
 521             es_format_t fmt;
 522
 523             /* Lets start a new track */
 524             if( sscanf( line, "id: %32[^ ,], index: %d",
 525                         language, &i_track_id ) == 2 )
 526             {
 527                 p_sys->i_tracks++;
 528                 p_sys->track = xrealloc( p_sys->track,
 529                           sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 530
 531                 /* Init the track */
 532                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
 533                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
 534                 current_tk->i_current_subtitle = 0;
 535                 current_tk->i_subtitles = 0;
 536                 current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );
 537                 current_tk->i_track_id = i_track_id;
 538                 current_tk->i_delay = (int64_t)0;
 539
 540                 es_format_Init( &fmt, SPU_ES, VLC_CODEC_SPU );
 541                 fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 542                 fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 543                 fmt.psz_language = language;
 544                 if( p_sys->b_palette )
 545                 {
 546                     fmt.subs.spu.palette[0] = 0xBeef;
 547                     memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 548                 }
 549
 550                 current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 551                 msg_Dbg( p_demux, "new vobsub track detected" );
 552             }
 553             else
 554             {
 555                 msg_Warn( p_demux, "reading new track failed" );
 556             }
 557         }
 558         else if( !strncmp( line, "timestamp:", 10 ) )
 559         {
 560             /*
 561              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 562              * loc is the hex location of the spu in the .sub file
 563              */
 564             int h, m, s, ms, count, loc = 0;
 565             int i_sign = 1;
 566             int64_t i_start, i_location = 0;
 567
 568             if( p_sys->i_tracks > 0 &&
 569                 sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 570                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 571             {
 572                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 573                 subtitle_t *current_sub;
 574
 575                 if( line[count-3] == '-' )
 576                 {
 577                     i_sign = -1;
 578                     h = -h;
 579                 }
 580                 i_start = (int64_t) ( h * 3600*1000 +
 581                             m * 60*1000 +
 582                             s * 1000 +
 583                             ms ) * 1000;
 584                 i_location = loc;
 585
 586                 current_tk->i_subtitles++;
 587                 current_tk->p_subtitles =
 588                     xrealloc( current_tk->p_subtitles,
 589                       sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 590                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 591
 592                 current_sub->i_start = i_start * i_sign;
 593                 current_sub->i_start += current_tk->i_delay;
 594                 current_sub->i_vobsub_location = i_location;
 595             }
 596             else
 597             {
 598                 msg_Warn( p_demux, "reading timestamp failed" );
 599             }
 600         }
 601         else if( !strncasecmp( line, "delay:", 6 ) )
 602         {
 603             /*
 604              * delay: [sign]hh:mm:ss:mss
 605              */
 606             int h, m, s, ms, count = 0;
 607             int i_sign = 1;
 608             int64_t i_gap = 0;
 609
 610             if( p_sys->i_tracks > 0 &&
 611                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 612                         &h, &count, &m, &s, &ms ) >= 4 )
 613             {
 614                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 615                 if( line[count-3] == '-' )
 616                 {
 617                     i_sign = -1;
 618                     h = -h;
 619                 }
 620                 i_gap = (int64_t) ( h * 3600*1000 +
 621                             m * 60*1000 +
 622                             s * 1000 +
 623                             ms ) * 1000;
 624
 625                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 626                 msg_Dbg( p_demux, "sign: %+d gap: %+"PRId64" global delay: %+"PRId64"",
 627                          i_sign, i_gap, current_tk->i_delay );
 628             }
 629             else
 630             {
 631                 msg_Warn( p_demux, "reading delay failed" );
 632             }
 633         }
 634     }
 635     return( 0 );
 636 }
 637
 638 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 639 {
 640     demux_sys_t *p_sys = p_demux->p_sys;
 641     uint8_t     *p = p_bk->p_buffer;
 642     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 643     int i;
 644
 645     while( p + 6 < p_end )
 646     {
 647         int i_size = ps_pkt_size( p, p_end - p );
 648         block_t *p_pkt;
 649         int      i_id;
 650         int      i_spu;
 651
 652         if( i_size <= 0 )
 653             break;
 654
 655         if( i_size > p_end - p )
 656         {
 657             msg_Warn( p_demux, "broken PES size" );
 658             break;
 659         }
 660
 661         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 662         {
 663             msg_Warn( p_demux, "invalid PES" );
 664             break;
 665         }
 666
 667         if( p[3] != 0xbd )
 668         {
 669             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 670             p += i_size;
 671             continue;
 672         }
 673
 674         /* Create a block */
 675         p_pkt = block_New( p_demux, i_size );
 676         memcpy( p_pkt->p_buffer, p, i_size);
 677         p += i_size;
 678
 679         i_id = ps_pkt_id( p_pkt );
 680         if( (i_id&0xffe0) != 0xbd20 ||
 681             ps_pkt_parse_pes( p_pkt, 1 ) )
 682         {
 683             block_Release( p_pkt );
 684             continue;
 685         }
 686         i_spu = i_id&0x1f;
 687         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 688
 689         for( i = 0; i < p_sys->i_tracks; i++ )
 690         {
 691             vobsub_track_t *p_tk = &p_sys->track[i];
 692
 693             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 694             p_pkt->i_length = 0;
 695
 696             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 697             {
 698                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 699                 p_bk->i_pts = VLC_TS_INVALID;     /*only first packet has a pts */
 700                 break;
 701             }
 702         }
 703         if( i >= p_sys->i_tracks )
 704         {
 705             block_Release( p_pkt );
 706         }
 707     }
 708
 709     return VLC_SUCCESS;
 710 }
 711