modules/demux/vobsub.c

   1 /*****************************************************************************
   2  * vobsub.c: Demux vobsub files.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 VLC authors and VideoLAN
   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 it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * 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 "mpeg/pes.h"
  40 #include "mpeg/ps.h"
  41 #include "vobsub.h"
  42 #include "subtitle_helper.h"
  43
  44 /*****************************************************************************
  45  * Module descriptor
  46  *****************************************************************************/
  47 static int  Open ( vlc_object_t *p_this );
  48 static void Close( vlc_object_t *p_this );
  49
  50 vlc_module_begin ()
  51     set_description( N_("Vobsub subtitles parser") )
  52     set_category( CAT_INPUT )
  53     set_subcategory( SUBCAT_INPUT_DEMUX )
  54     set_capability( "demux", 1 )
  55
  56     set_callbacks( Open, Close )
  57
  58     add_shortcut( "vobsub", "subtitle" )
  59 vlc_module_end ()
  60
  61 /*****************************************************************************
  62  * Prototypes:
  63  *****************************************************************************/
  64
  65 typedef struct
  66 {
  67     int     i_line_count;
  68     int     i_line;
  69     char    **line;
  70 } text_t;
  71
  72 typedef struct
  73 {
  74     int64_t i_start;
  75     int     i_vobsub_location;
  76 } subtitle_t;
  77
  78 typedef struct
  79 {
  80     es_out_id_t *p_es;
  81     int         i_track_id;
  82
  83     int         i_current_subtitle;
  84     int         i_subtitles;
  85     subtitle_t  *p_subtitles;
  86
  87     int64_t     i_delay;
  88 } vobsub_track_t;
  89
  90 struct demux_sys_t
  91 {
  92     int64_t        i_next_demux_date;
  93     int64_t        i_length;
  94
  95     text_t         txt;
  96     stream_t       *p_vobsub_stream;
  97
  98     /* all tracks */
  99     int            i_tracks;
 100     vobsub_track_t *track;
 101
 102     int            i_original_frame_width;
 103     int            i_original_frame_height;
 104     bool           b_palette;
 105     uint32_t       palette[16];
 106 };
 107
 108
 109 static int Demux( demux_t * );
 110 static int Control( demux_t *, int, va_list );
 111
 112 static int  TextLoad( text_t *, stream_t *s );
 113 static void TextUnload( text_t * );
 114 static int ParseVobSubIDX( demux_t * );
 115 static int DemuxVobSub( demux_t *, block_t *);
 116
 117 /*****************************************************************************
 118  * Module initializer
 119  *****************************************************************************/
 120 static int Open ( vlc_object_t *p_this )
 121 {
 122     demux_t     *p_demux = (demux_t*)p_this;
 123     demux_sys_t *p_sys;
 124     char *psz_vobname, *s;
 125     int i_len;
 126     uint64_t i_read_offset = 0;
 127
 128     if( ( s = peek_Readline( p_demux->s, &i_read_offset ) ) != NULL )
 129     {
 130         if( !strcasestr( s, "# VobSub index file" ) )
 131         {
 132             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 133             free( s );
 134             return VLC_EGENERIC;
 135         }
 136         free( s );
 137     }
 138     else
 139     {
 140         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 141         return VLC_EGENERIC;
 142     }
 143
 144     /* */
 145     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 146     if( unlikely( !p_sys ) )
 147         return VLC_ENOMEM;
 148
 149     p_sys->i_length = 0;
 150     p_sys->p_vobsub_stream = NULL;
 151     p_sys->i_tracks = 0;
 152     p_sys->track = malloc( sizeof( vobsub_track_t ) );
 153     if( unlikely( !p_sys->track ) )
 154         goto error;
 155     p_sys->i_original_frame_width = -1;
 156     p_sys->i_original_frame_height = -1;
 157     p_sys->b_palette = false;
 158     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 159
 160     /* Load the whole file */
 161     TextLoad( &p_sys->txt, p_demux->s );
 162
 163     /* Parse it */
 164     ParseVobSubIDX( p_demux );
 165
 166     /* Unload */
 167     TextUnload( &p_sys->txt );
 168
 169     /* Find the total length of the vobsubs */
 170     if( p_sys->i_tracks > 0 )
 171     {
 172         for( int i = 0; i < p_sys->i_tracks; i++ )
 173         {
 174             if( p_sys->track[i].i_subtitles > 1 )
 175             {
 176                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 177                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 178             }
 179         }
 180     }
 181
 182     psz_vobname = strdup( p_demux->psz_url );
 183     if( psz_vobname == NULL )
 184         goto error;
 185
 186     i_len = strlen( psz_vobname );
 187     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 188
 189     /* open file */
 190     p_sys->p_vobsub_stream = vlc_stream_NewURL( p_demux, psz_vobname );
 191     if( p_sys->p_vobsub_stream == NULL )
 192     {
 193         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 194                  psz_vobname );
 195         free( psz_vobname );
 196         goto error;
 197     }
 198     free( psz_vobname );
 199
 200     p_demux->pf_demux = Demux;
 201     p_demux->pf_control = Control;
 202
 203     return VLC_SUCCESS;
 204
 205 error:
 206     /* Clean all subs from all tracks */
 207     for( int i = 0; i < p_sys->i_tracks; i++ )
 208         free( p_sys->track[i].p_subtitles );
 209     free( p_sys->track );
 210     free( p_sys );
 211
 212     return VLC_EGENERIC;
 213 }
 214
 215 /*****************************************************************************
 216  * Close: Close subtitle demux
 217  *****************************************************************************/
 218 static void Close( vlc_object_t *p_this )
 219 {
 220     demux_t *p_demux = (demux_t*)p_this;
 221     demux_sys_t *p_sys = p_demux->p_sys;
 222
 223     if( p_sys->p_vobsub_stream )
 224         vlc_stream_Delete( p_sys->p_vobsub_stream );
 225
 226     /* Clean all subs from all tracks */
 227     for( int i = 0; i < p_sys->i_tracks; i++ )
 228         free( p_sys->track[i].p_subtitles );
 229     free( p_sys->track );
 230     free( p_sys );
 231 }
 232
 233 /*****************************************************************************
 234  * Control:
 235  *****************************************************************************/
 236 static int Control( demux_t *p_demux, int i_query, va_list args )
 237 {
 238     demux_sys_t *p_sys = p_demux->p_sys;
 239     int64_t *pi64, i64;
 240     int i;
 241     double *pf, f;
 242
 243     switch( i_query )
 244     {
 245         case DEMUX_CAN_SEEK:
 246             *va_arg( args, bool * ) = true;
 247             return VLC_SUCCESS;
 248
 249         case DEMUX_GET_LENGTH:
 250             pi64 = 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 = 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 = 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 = 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 = 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 = va_arg( args, int64_t );
 331             return VLC_SUCCESS;
 332
 333         case DEMUX_GET_PTS_DELAY:
 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_read;
 356
 357     for( int 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( vlc_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_Alloc( i_size ) ) == NULL )
 395             {
 396                 tk.i_current_subtitle++;
 397                 continue;
 398             }
 399
 400             /* read data */
 401             i_read = vlc_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             block_Release( p_block );
 417
 418             tk.i_current_subtitle++;
 419         }
 420 #undef tk
 421     }
 422
 423     /* */
 424     p_sys->i_next_demux_date = 0;
 425
 426     return 1;
 427 }
 428
 429 static int TextLoad( text_t *txt, stream_t *s )
 430 {
 431     char **lines = NULL;
 432     size_t n = 0;
 433
 434     /* load the complete file */
 435     for( ;; )
 436     {
 437         char *psz = vlc_stream_ReadLine( s );
 438         char **ppsz_new;
 439
 440         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 441         {
 442             free( psz );
 443             break;
 444         }
 445
 446         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 447         if( ppsz_new == NULL )
 448         {
 449             free( psz );
 450             break;
 451         }
 452         lines = ppsz_new;
 453         lines[n++] = psz;
 454     }
 455
 456     txt->i_line_count = n;
 457     txt->i_line       = 0;
 458     txt->line         = lines;
 459
 460     return VLC_SUCCESS;
 461 }
 462
 463 static void TextUnload( text_t *txt )
 464 {
 465     for( int i = 0; i < txt->i_line_count; i++ )
 466         free( txt->line[i] );
 467     free( txt->line );
 468
 469     txt->i_line       = 0;
 470     txt->i_line_count = 0;
 471 }
 472
 473 static char *TextGetLine( text_t *txt )
 474 {
 475     if( txt->i_line >= txt->i_line_count )
 476         return( NULL );
 477
 478     return txt->line[txt->i_line++];
 479 }
 480
 481 static int ParseVobSubIDX( demux_t *p_demux )
 482 {
 483     demux_sys_t *p_sys = p_demux->p_sys;
 484     text_t      *txt = &p_sys->txt;
 485     char        *line;
 486
 487     for( ;; )
 488     {
 489         if( ( line = TextGetLine( txt ) ) == NULL )
 490         {
 491             return( VLC_EGENERIC );
 492         }
 493
 494         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 495         {
 496             continue;
 497         }
 498         else if( !strncmp( "size:", line, 5 ) )
 499         {
 500             /* Store the original size of the video */
 501             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 502                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 503             {
 504                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 505             }
 506             else
 507             {
 508                 msg_Warn( p_demux, "reading original frame size failed" );
 509             }
 510         }
 511         else if( !strncmp( "palette:", line, 8 ) )
 512         {
 513             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 514             {
 515                 p_sys->b_palette = true;
 516                 msg_Dbg( p_demux, "vobsub palette read" );
 517             }
 518             else
 519             {
 520                 msg_Warn( p_demux, "reading original palette failed" );
 521             }
 522         }
 523         else if( !strncmp( "id:", line, 3 ) )
 524         {
 525             char language[33]; /* Usually 2 or 3 letters, sometimes more.
 526                                   Spec (or lack of) doesn't define any limit */
 527             int i_track_id;
 528             es_format_t fmt;
 529
 530             /* Lets start a new track */
 531             if( sscanf( line, "id: %32[^ ,], index: %d",
 532                         language, &i_track_id ) != 2 )
 533             {
 534                 if( sscanf( line, "id: , index: %d", &i_track_id ) != 1 )
 535                 {
 536                     msg_Warn( p_demux, "reading new track failed" );
 537                     continue;
 538                 }
 539                 language[0] = '\0';
 540             }
 541
 542             p_sys->i_tracks++;
 543             p_sys->track = xrealloc( p_sys->track,
 544                     sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 545
 546             /* Init the track */
 547             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 548             memset( current_tk, 0, sizeof( vobsub_track_t ) );
 549             current_tk->i_current_subtitle = 0;
 550             current_tk->i_subtitles = 0;
 551             current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );
 552             current_tk->i_track_id = i_track_id;
 553             current_tk->i_delay = (int64_t)0;
 554
 555             es_format_Init( &fmt, SPU_ES, VLC_CODEC_SPU );
 556             fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 557             fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 558             fmt.psz_language = language;
 559             if( p_sys->b_palette )
 560             {
 561                 fmt.subs.spu.palette[0] = SPU_PALETTE_DEFINED;
 562                 memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 563             }
 564
 565             current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 566             msg_Dbg( p_demux, "New vobsub track detected: %i [%s]", i_track_id, language );
 567         }
 568         else if( !strncmp( line, "timestamp:", 10 ) )
 569         {
 570             /*
 571              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 572              * loc is the hex location of the spu in the .sub file
 573              */
 574             int h, m, s, ms, count, loc = 0;
 575             int i_sign = 1;
 576             int64_t i_start, i_location = 0;
 577
 578             if( p_sys->i_tracks > 0 &&
 579                 sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 580                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 581             {
 582                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 583                 subtitle_t *current_sub;
 584
 585                 if( line[count-3] == '-' )
 586                 {
 587                     i_sign = -1;
 588                     h = -h;
 589                 }
 590                 i_start = (int64_t) ( h * 3600*1000 +
 591                             m * 60*1000 +
 592                             s * 1000 +
 593                             ms ) * 1000;
 594                 i_location = loc;
 595
 596                 current_tk->i_subtitles++;
 597                 current_tk->p_subtitles =
 598                     xrealloc( current_tk->p_subtitles,
 599                       sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 600                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 601
 602                 current_sub->i_start = i_start * i_sign;
 603                 current_sub->i_start += current_tk->i_delay;
 604                 current_sub->i_vobsub_location = i_location;
 605             }
 606             else
 607             {
 608                 msg_Warn( p_demux, "reading timestamp failed" );
 609             }
 610         }
 611         else if( !strncasecmp( line, "delay:", 6 ) )
 612         {
 613             /*
 614              * delay: [sign]hh:mm:ss:mss
 615              */
 616             int h, m, s, ms, count = 0;
 617             int i_sign = 1;
 618             int64_t i_gap = 0;
 619
 620             if( p_sys->i_tracks > 0 &&
 621                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 622                         &h, &count, &m, &s, &ms ) >= 4 )
 623             {
 624                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 625                 if( line[count-3] == '-' )
 626                 {
 627                     i_sign = -1;
 628                     h = -h;
 629                 }
 630                 i_gap = (int64_t) ( h * 3600*1000 +
 631                             m * 60*1000 +
 632                             s * 1000 +
 633                             ms ) * 1000;
 634
 635                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 636                 msg_Dbg( p_demux, "sign: %+d gap: %+"PRId64" global delay: %+"PRId64"",
 637                          i_sign, i_gap, current_tk->i_delay );
 638             }
 639             else
 640             {
 641                 msg_Warn( p_demux, "reading delay failed" );
 642             }
 643         }
 644     }
 645     return( 0 );
 646 }
 647
 648 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 649 {
 650     demux_sys_t *p_sys = p_demux->p_sys;
 651     uint8_t     *p = p_bk->p_buffer;
 652     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 653     int i;
 654
 655     while( p + 6 < p_end )
 656     {
 657         int i_size = ps_pkt_size( p, p_end - p );
 658         block_t *p_pkt;
 659         int      i_id;
 660         int      i_spu;
 661
 662         if( i_size <= 0 )
 663             break;
 664
 665         if( i_size > p_end - p )
 666         {
 667             msg_Warn( p_demux, "broken PES size" );
 668             break;
 669         }
 670
 671         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 672         {
 673             msg_Warn( p_demux, "invalid PES" );
 674             break;
 675         }
 676
 677         if( p[3] != 0xbd )
 678         {
 679             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 680             p += i_size;
 681             continue;
 682         }
 683
 684         /* Create a block */
 685         p_pkt = block_Alloc( i_size );
 686         if( unlikely(p_pkt == NULL) )
 687             break;
 688         memcpy( p_pkt->p_buffer, p, i_size);
 689         p += i_size;
 690
 691         i_id = ps_pkt_id( p_pkt );
 692         if( (i_id&0xffe0) != 0xbd20 ||
 693             ps_pkt_parse_pes( VLC_OBJECT(p_demux), p_pkt, 1 ) )
 694         {
 695             block_Release( p_pkt );
 696             continue;
 697         }
 698         i_spu = i_id&0x1f;
 699         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 700
 701         for( i = 0; i < p_sys->i_tracks; i++ )
 702         {
 703             vobsub_track_t *p_tk = &p_sys->track[i];
 704
 705             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 706             p_pkt->i_length = 0;
 707
 708             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 709             {
 710                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 711                 p_bk->i_pts = VLC_TS_INVALID;     /*only first packet has a pts */
 712                 break;
 713             }
 714         }
 715         if( i >= p_sys->i_tracks )
 716         {
 717             block_Release( p_pkt );
 718         }
 719     }
 720
 721     return VLC_SUCCESS;
 722 }
 723