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 #include <limits.h>
  38
  39 #include <vlc_demux.h>
  40 #include <vlc_charset.h>
  41
  42 #include "ps.h"
  43 #include "vobsub.h"
  44
  45 #define MAX_LINE 8192
  46
  47 /*****************************************************************************
  48  * Module descriptor
  49  *****************************************************************************/
  50 static int  Open ( vlc_object_t *p_this );
  51 static void Close( vlc_object_t *p_this );
  52
  53 vlc_module_begin ()
  54     set_description( N_("Vobsub subtitles parser") )
  55     set_category( CAT_INPUT )
  56     set_subcategory( SUBCAT_INPUT_DEMUX )
  57     set_capability( "demux", 1 )
  58
  59     set_callbacks( Open, Close )
  60
  61     add_shortcut( "vobsub" )
  62     add_shortcut( "subtitle" )
  63 vlc_module_end ()
  64
  65 /*****************************************************************************
  66  * Prototypes:
  67  *****************************************************************************/
  68
  69 typedef struct
  70 {
  71     int     i_line_count;
  72     int     i_line;
  73     char    **line;
  74 } text_t;
  75 static int  TextLoad( text_t *, stream_t *s );
  76 static void TextUnload( text_t * );
  77
  78 typedef struct
  79 {
  80     int64_t i_start;
  81     int     i_vobsub_location;
  82 } subtitle_t;
  83
  84 typedef struct
  85 {
  86     es_format_t fmt;
  87     es_out_id_t *p_es;
  88     int         i_track_id;
  89
  90     int         i_current_subtitle;
  91     int         i_subtitles;
  92     subtitle_t  *p_subtitles;
  93
  94     int64_t     i_delay;
  95 } vobsub_track_t;
  96
  97 struct demux_sys_t
  98 {
  99     int64_t     i_next_demux_date;
 100     int64_t     i_length;
 101
 102     text_t      txt;
 103     stream_t    *p_vobsub_stream;
 104
 105     /* all tracks */
 106     int            i_tracks;
 107     vobsub_track_t *track;
 108
 109     int         i_original_frame_width;
 110     int         i_original_frame_height;
 111     bool  b_palette;
 112     uint32_t    palette[16];
 113 };
 114
 115 static int Demux( demux_t * );
 116 static int Control( demux_t *, int, va_list );
 117
 118 static int ParseVobSubIDX( demux_t * );
 119 static int DemuxVobSub( demux_t *, block_t *);
 120
 121 /*****************************************************************************
 122  * Module initializer
 123  *****************************************************************************/
 124 static int Open ( vlc_object_t *p_this )
 125 {
 126     demux_t     *p_demux = (demux_t*)p_this;
 127     demux_sys_t *p_sys;
 128     char *psz_vobname, *s;
 129     int i_len;
 130
 131     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 132     {
 133         if( !strcasestr( s, "# VobSub index file" ) )
 134         {
 135             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 136             free( s );
 137             if( stream_Seek( p_demux->s, 0 ) )
 138             {
 139                 msg_Warn( p_demux, "failed to rewind" );
 140             }
 141             return VLC_EGENERIC;
 142         }
 143         free( s );
 144
 145     }
 146     else
 147     {
 148         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 149         return VLC_EGENERIC;
 150     }
 151
 152     p_demux->pf_demux = Demux;
 153     p_demux->pf_control = Control;
 154     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 155     if( unlikely( !p_sys ) )
 156         return VLC_ENOMEM;
 157     p_sys->i_length = 0;
 158     p_sys->p_vobsub_stream = NULL;
 159     p_sys->i_tracks = 0;
 160     p_sys->track = malloc( sizeof( vobsub_track_t ) );
 161     if( unlikely( !p_sys->track ) )
 162     {
 163         free( p_sys );
 164         return VLC_ENOMEM;
 165     }
 166     p_sys->i_original_frame_width = -1;
 167     p_sys->i_original_frame_height = -1;
 168     p_sys->b_palette = false;
 169     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 170
 171     /* Load the whole file */
 172     TextLoad( &p_sys->txt, p_demux->s );
 173
 174     /* Parse it */
 175     ParseVobSubIDX( p_demux );
 176
 177     /* Unload */
 178     TextUnload( &p_sys->txt );
 179
 180     /* Find the total length of the vobsubs */
 181     if( p_sys->i_tracks > 0 )
 182     {
 183         int i;
 184         for( i = 0; i < p_sys->i_tracks; i++ )
 185         {
 186             if( p_sys->track[i].i_subtitles > 1 )
 187             {
 188                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 189                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 190             }
 191         }
 192     }
 193
 194     if( asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_path ) == -1 )
 195     {
 196         free( p_sys );
 197         return VLC_EGENERIC;
 198     }
 199     i_len = strlen( psz_vobname );
 200     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 201
 202     /* open file */
 203     p_sys->p_vobsub_stream = stream_UrlNew( p_demux, psz_vobname );
 204     if( p_sys->p_vobsub_stream == NULL )
 205     {
 206         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 207                  psz_vobname );
 208         free( psz_vobname );
 209         free( p_sys );
 210         return VLC_EGENERIC;
 211     }
 212     free( psz_vobname );
 213
 214     return VLC_SUCCESS;
 215 }
 216
 217 /*****************************************************************************
 218  * Close: Close subtitle demux
 219  *****************************************************************************/
 220 static void Close( vlc_object_t *p_this )
 221 {
 222     int i;
 223     demux_t *p_demux = (demux_t*)p_this;
 224     demux_sys_t *p_sys = p_demux->p_sys;
 225
 226     /* Clean all subs from all tracks */
 227     for( i = 0; i < p_sys->i_tracks; i++ )
 228         free( p_sys->track[i].p_subtitles );
 229
 230     free( p_sys->track );
 231
 232     if( p_sys->p_vobsub_stream )
 233         stream_Delete( p_sys->p_vobsub_stream );
 234
 235     free( p_sys );
 236 }
 237
 238 /*****************************************************************************
 239  * Control:
 240  *****************************************************************************/
 241 static int Control( demux_t *p_demux, int i_query, va_list args )
 242 {
 243     demux_sys_t *p_sys = p_demux->p_sys;
 244     int64_t *pi64, i64;
 245     int i;
 246     double *pf, f;
 247
 248     switch( i_query )
 249     {
 250         case DEMUX_GET_LENGTH:
 251             pi64 = (int64_t*)va_arg( args, int64_t * );
 252             *pi64 = (int64_t) p_sys->i_length;
 253             return VLC_SUCCESS;
 254
 255         case DEMUX_GET_TIME:
 256             pi64 = (int64_t*)va_arg( args, int64_t * );
 257             for( i = 0; i < p_sys->i_tracks; i++ )
 258             {
 259                 bool b_selected;
 260                 /* Check the ES is selected */
 261                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 262                                 p_sys->track[i].p_es, &b_selected );
 263                 if( b_selected ) break;
 264             }
 265             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 266             {
 267                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 268                 return VLC_SUCCESS;
 269             }
 270             return VLC_EGENERIC;
 271
 272         case DEMUX_SET_TIME:
 273             i64 = (int64_t)va_arg( args, int64_t );
 274             for( i = 0; i < p_sys->i_tracks; i++ )
 275             {
 276                 p_sys->track[i].i_current_subtitle = 0;
 277                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 278                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 279                 {
 280                     p_sys->track[i].i_current_subtitle++;
 281                 }
 282
 283                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 284                     return VLC_EGENERIC;
 285             }
 286             return VLC_SUCCESS;
 287
 288         case DEMUX_GET_POSITION:
 289             pf = (double*)va_arg( args, double * );
 290             for( i = 0; i < p_sys->i_tracks; i++ )
 291             {
 292                 bool b_selected;
 293                 /* Check the ES is selected */
 294                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 295                                 p_sys->track[i].p_es, &b_selected );
 296                 if( b_selected ) break;
 297             }
 298             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 299             {
 300                 *pf = 1.0;
 301             }
 302             else if( p_sys->track[i].i_subtitles > 0 )
 303             {
 304                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 305                       (double)p_sys->i_length;
 306             }
 307             else
 308             {
 309                 *pf = 0.0;
 310             }
 311             return VLC_SUCCESS;
 312
 313         case DEMUX_SET_POSITION:
 314             f = (double)va_arg( args, double );
 315             i64 = (int64_t) f * p_sys->i_length;
 316
 317             for( i = 0; i < p_sys->i_tracks; i++ )
 318             {
 319                 p_sys->track[i].i_current_subtitle = 0;
 320                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 321                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 322                 {
 323                     p_sys->track[i].i_current_subtitle++;
 324                 }
 325                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 326                     return VLC_EGENERIC;
 327             }
 328             return VLC_SUCCESS;
 329
 330         case DEMUX_SET_NEXT_DEMUX_TIME:
 331             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 332             return VLC_SUCCESS;
 333
 334         case DEMUX_GET_FPS:
 335         case DEMUX_GET_META:
 336         case DEMUX_GET_TITLE_INFO:
 337         case DEMUX_HAS_UNSUPPORTED_META:
 338         case DEMUX_GET_ATTACHMENTS:
 339         case DEMUX_CAN_RECORD:
 340             return VLC_EGENERIC;
 341
 342         default:
 343             msg_Warn( p_demux, "unknown query in subtitle control" );
 344             return VLC_EGENERIC;
 345     }
 346 }
 347
 348 /*****************************************************************************
 349  * Demux: Send subtitle to decoder
 350  *****************************************************************************/
 351 static int Demux( demux_t *p_demux )
 352 {
 353     demux_sys_t *p_sys = p_demux->p_sys;
 354     int64_t i_maxdate;
 355     int i, i_read;
 356
 357     for( i = 0; i < p_sys->i_tracks; i++ )
 358     {
 359 #define tk p_sys->track[i]
 360         if( tk.i_current_subtitle >= tk.i_subtitles )
 361             continue;
 362
 363         i_maxdate = p_sys->i_next_demux_date;
 364         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 365         {
 366             /* Should not happen */
 367             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 368         }
 369
 370         while( tk.i_current_subtitle < tk.i_subtitles &&
 371                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 372         {
 373             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 374             block_t *p_block;
 375             int i_size = 0;
 376
 377             /* first compute SPU size */
 378             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 379             {
 380                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 381             }
 382             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 383
 384             /* Seek at the right place */
 385             if( stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 386             {
 387                 msg_Warn( p_demux,
 388                           "cannot seek in the VobSub to the correct time %d", i_pos );
 389                 tk.i_current_subtitle++;
 390                 continue;
 391             }
 392
 393             /* allocate a packet */
 394             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 395             {
 396                 tk.i_current_subtitle++;
 397                 continue;
 398             }
 399
 400             /* read data */
 401             i_read = stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 402             if( i_read <= 6 )
 403             {
 404                 block_Release( p_block );
 405                 tk.i_current_subtitle++;
 406                 continue;
 407             }
 408             p_block->i_buffer = i_read;
 409
 410             /* pts */
 411             p_block->i_pts = VLC_TS_0 + tk.p_subtitles[tk.i_current_subtitle].i_start;
 412
 413             /* demux this block */
 414             DemuxVobSub( p_demux, p_block );
 415
 416             tk.i_current_subtitle++;
 417         }
 418 #undef tk
 419     }
 420
 421     /* */
 422     p_sys->i_next_demux_date = 0;
 423
 424     return 1;
 425 }
 426
 427 static int TextLoad( text_t *txt, stream_t *s )
 428 {
 429     char **lines = NULL;
 430     size_t n = 0;
 431
 432     /* load the complete file */
 433     for( ;; )
 434     {
 435         char *psz = stream_ReadLine( s );
 436         char **ppsz_new;
 437
 438         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 439             break;
 440
 441         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 442         if( ppsz_new == NULL )
 443         {
 444             free( psz );
 445             break;
 446         }
 447         lines = ppsz_new;
 448         lines[n++] = psz;
 449     }
 450
 451     txt->i_line_count = n;
 452     txt->i_line       = 0;
 453     txt->line         = lines;
 454
 455     return VLC_SUCCESS;
 456 }
 457
 458 static void TextUnload( text_t *txt )
 459 {
 460     int i;
 461
 462     for( i = 0; i < txt->i_line_count; i++ )
 463         free( txt->line[i] );
 464
 465     free( txt->line );
 466     txt->i_line       = 0;
 467     txt->i_line_count = 0;
 468 }
 469
 470 static char *TextGetLine( text_t *txt )
 471 {
 472     if( txt->i_line >= txt->i_line_count )
 473         return( NULL );
 474
 475     return txt->line[txt->i_line++];
 476 }
 477
 478 static int ParseVobSubIDX( demux_t *p_demux )
 479 {
 480     demux_sys_t *p_sys = p_demux->p_sys;
 481     text_t      *txt = &p_sys->txt;
 482     char        *line;
 483     vobsub_track_t *current_tk = NULL;
 484
 485     for( ;; )
 486     {
 487         if( ( line = TextGetLine( txt ) ) == NULL )
 488         {
 489             return( VLC_EGENERIC );
 490         }
 491
 492         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 493         {
 494             continue;
 495         }
 496         else if( !strncmp( "size:", line, 5 ) )
 497         {
 498             /* Store the original size of the video */
 499             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 500                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 501             {
 502                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 503             }
 504             else
 505             {
 506                 msg_Warn( p_demux, "reading original frame size failed" );
 507             }
 508         }
 509         else if( !strncmp( "palette:", line, 8 ) )
 510         {
 511             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 512             {
 513                 p_sys->b_palette = true;
 514                 msg_Dbg( p_demux, "vobsub palette read" );
 515             }
 516             else
 517             {
 518                 msg_Warn( p_demux, "reading original palette failed" );
 519             }
 520         }
 521         else if( !strncmp( "id:", line, 3 ) )
 522         {
 523             char language[3];
 524             int i_track_id;
 525             es_format_t fmt;
 526
 527             /* Lets start a new track */
 528             if( sscanf( line, "id: %2s, index: %d",
 529                         language, &i_track_id ) == 2 )
 530             {
 531                 p_sys->i_tracks++;
 532                 p_sys->track = xrealloc( p_sys->track,
 533                           sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 534                 language[2] = '\0';
 535
 536                 /* Init the track */
 537                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
 538                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
 539                 current_tk->i_current_subtitle = 0;
 540                 current_tk->i_subtitles = 0;
 541                 current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );;
 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                     xrealloc( current_tk->p_subtitles,
 594                       sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 595                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 596
 597                 current_sub->i_start = i_start * i_sign;
 598                 current_sub->i_start += current_tk->i_delay;
 599                 current_sub->i_vobsub_location = i_location;
 600             }
 601             else
 602             {
 603                 msg_Warn( p_demux, "reading timestamp failed" );
 604             }
 605         }
 606         else if( !strncasecmp( line, "delay:", 6 ) )
 607         {
 608             /*
 609              * delay: [sign]hh:mm:ss:mss
 610              */
 611             int h, m, s, ms, count = 0;
 612             int i_sign = 1;
 613             int64_t i_gap = 0;
 614
 615             if( p_sys->i_tracks > 0 &&
 616                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 617                         &h, &count, &m, &s, &ms ) >= 4 )
 618             {
 619                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 620                 if( line[count-3] == '-' )
 621                 {
 622                     i_sign = -1;
 623                     h = -h;
 624                 }
 625                 i_gap = (int64_t) ( h * 3600*1000 +
 626                             m * 60*1000 +
 627                             s * 1000 +
 628                             ms ) * 1000;
 629
 630                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 631                 msg_Dbg( p_demux, "sign: %+d gap: %+"PRId64" global delay: %+"PRId64"",
 632                          i_sign, i_gap, current_tk->i_delay );
 633             }
 634             else
 635             {
 636                 msg_Warn( p_demux, "reading delay failed" );
 637             }
 638         }
 639     }
 640     return( 0 );
 641 }
 642
 643 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 644 {
 645     demux_sys_t *p_sys = p_demux->p_sys;
 646     uint8_t     *p = p_bk->p_buffer;
 647     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 648     int i;
 649
 650     while( p + 6 < p_end )
 651     {
 652         int i_size = ps_pkt_size( p, p_end - p );
 653         block_t *p_pkt;
 654         int      i_id;
 655         int      i_spu;
 656
 657         if( i_size <= 0 )
 658             break;
 659
 660         if( i_size > p_end - p )
 661         {
 662             msg_Warn( p_demux, "broken PES size" );
 663             break;
 664         }
 665
 666         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 667         {
 668             msg_Warn( p_demux, "invalid PES" );
 669             break;
 670         }
 671
 672         if( p[3] != 0xbd )
 673         {
 674             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 675             p += i_size;
 676             continue;
 677         }
 678
 679         /* Create a block */
 680         p_pkt = block_New( p_demux, i_size );
 681         memcpy( p_pkt->p_buffer, p, i_size);
 682         p += i_size;
 683
 684         i_id = ps_pkt_id( p_pkt );
 685         if( (i_id&0xffe0) != 0xbd20 ||
 686             ps_pkt_parse_pes( p_pkt, 1 ) )
 687         {
 688             block_Release( p_pkt );
 689             continue;
 690         }
 691         i_spu = i_id&0x1f;
 692         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 693
 694         for( i = 0; i < p_sys->i_tracks; i++ )
 695         {
 696             vobsub_track_t *p_tk = &p_sys->track[i];
 697
 698             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 699             p_pkt->i_length = 0;
 700
 701             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 702             {
 703                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 704                 p_bk->i_pts = VLC_TS_INVALID;     /*only first packet has a pts */
 705                 break;
 706             }
 707         }
 708         if( i >= p_sys->i_tracks )
 709         {
 710             block_Release( p_pkt );
 711         }
 712     }
 713
 714     return VLC_SUCCESS;
 715 }
 716