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     vlc_tick_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 typedef struct
  91 {
  92     vlc_tick_t     i_next_demux_date;
  93     vlc_tick_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 } demux_sys_t;
 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, vlc_tick_t );
 331             return VLC_SUCCESS;
 332
 333         case DEMUX_CAN_PAUSE:
 334         case DEMUX_SET_PAUSE_STATE:
 335         case DEMUX_CAN_CONTROL_PACE:
 336             return demux_vaControlHelper( p_demux->s, 0, -1, 0, 1, i_query, args );
 337
 338         case DEMUX_GET_PTS_DELAY:
 339         case DEMUX_GET_FPS:
 340         case DEMUX_GET_META:
 341         case DEMUX_GET_TITLE_INFO:
 342         case DEMUX_HAS_UNSUPPORTED_META:
 343         case DEMUX_GET_ATTACHMENTS:
 344         case DEMUX_CAN_RECORD:
 345             return VLC_EGENERIC;
 346
 347         default:
 348             msg_Warn( p_demux, "unknown query in subtitle control" );
 349             return VLC_EGENERIC;
 350     }
 351 }
 352
 353 /*****************************************************************************
 354  * Demux: Send subtitle to decoder
 355  *****************************************************************************/
 356 static int Demux( demux_t *p_demux )
 357 {
 358     demux_sys_t *p_sys = p_demux->p_sys;
 359     vlc_tick_t i_maxdate;
 360     int i_read;
 361
 362     for( int i = 0; i < p_sys->i_tracks; i++ )
 363     {
 364 #define tk p_sys->track[i]
 365         if( tk.i_current_subtitle >= tk.i_subtitles )
 366             continue;
 367
 368         i_maxdate = p_sys->i_next_demux_date;
 369         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 370         {
 371             /* Should not happen */
 372             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 373         }
 374
 375         while( tk.i_current_subtitle < tk.i_subtitles &&
 376                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 377         {
 378             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 379             block_t *p_block;
 380             int i_size = 0;
 381
 382             /* first compute SPU size */
 383             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 384             {
 385                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 386             }
 387             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 388
 389             /* Seek at the right place */
 390             if( vlc_stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 391             {
 392                 msg_Warn( p_demux,
 393                           "cannot seek in the VobSub to the correct time %d", i_pos );
 394                 tk.i_current_subtitle++;
 395                 continue;
 396             }
 397
 398             /* allocate a packet */
 399             if( ( p_block = block_Alloc( i_size ) ) == NULL )
 400             {
 401                 tk.i_current_subtitle++;
 402                 continue;
 403             }
 404
 405             /* read data */
 406             i_read = vlc_stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 407             if( i_read <= 6 )
 408             {
 409                 block_Release( p_block );
 410                 tk.i_current_subtitle++;
 411                 continue;
 412             }
 413             p_block->i_buffer = i_read;
 414
 415             /* pts */
 416             p_block->i_pts = VLC_TICK_0 + tk.p_subtitles[tk.i_current_subtitle].i_start;
 417
 418             /* demux this block */
 419             DemuxVobSub( p_demux, p_block );
 420
 421             block_Release( p_block );
 422
 423             tk.i_current_subtitle++;
 424         }
 425 #undef tk
 426     }
 427
 428     /* */
 429     p_sys->i_next_demux_date = 0;
 430
 431     return 1;
 432 }
 433
 434 static int TextLoad( text_t *txt, stream_t *s )
 435 {
 436     char **lines = NULL;
 437     size_t n = 0;
 438
 439     /* load the complete file */
 440     for( ;; )
 441     {
 442         char *psz = vlc_stream_ReadLine( s );
 443         char **ppsz_new;
 444
 445         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 446         {
 447             free( psz );
 448             break;
 449         }
 450
 451         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 452         if( ppsz_new == NULL )
 453         {
 454             free( psz );
 455             break;
 456         }
 457         lines = ppsz_new;
 458         lines[n++] = psz;
 459     }
 460
 461     txt->i_line_count = n;
 462     txt->i_line       = 0;
 463     txt->line         = lines;
 464
 465     return VLC_SUCCESS;
 466 }
 467
 468 static void TextUnload( text_t *txt )
 469 {
 470     for( int i = 0; i < txt->i_line_count; i++ )
 471         free( txt->line[i] );
 472     free( txt->line );
 473
 474     txt->i_line       = 0;
 475     txt->i_line_count = 0;
 476 }
 477
 478 static char *TextGetLine( text_t *txt )
 479 {
 480     if( txt->i_line >= txt->i_line_count )
 481         return( NULL );
 482
 483     return txt->line[txt->i_line++];
 484 }
 485
 486 static int ParseVobSubIDX( demux_t *p_demux )
 487 {
 488     demux_sys_t *p_sys = p_demux->p_sys;
 489     text_t      *txt = &p_sys->txt;
 490     char        *line;
 491
 492     for( ;; )
 493     {
 494         if( ( line = TextGetLine( txt ) ) == NULL )
 495         {
 496             return( VLC_EGENERIC );
 497         }
 498
 499         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 500         {
 501             continue;
 502         }
 503         else if( !strncmp( "size:", line, 5 ) )
 504         {
 505             /* Store the original size of the video */
 506             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 507                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 508             {
 509                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 510             }
 511             else
 512             {
 513                 msg_Warn( p_demux, "reading original frame size failed" );
 514             }
 515         }
 516         else if( !strncmp( "palette:", line, 8 ) )
 517         {
 518             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 519             {
 520                 p_sys->b_palette = true;
 521                 msg_Dbg( p_demux, "vobsub palette read" );
 522             }
 523             else
 524             {
 525                 msg_Warn( p_demux, "reading original palette failed" );
 526             }
 527         }
 528         else if( !strncmp( "id:", line, 3 ) )
 529         {
 530             char language[33]; /* Usually 2 or 3 letters, sometimes more.
 531                                   Spec (or lack of) doesn't define any limit */
 532             int i_track_id;
 533             es_format_t fmt;
 534
 535             /* Lets start a new track */
 536             if( sscanf( line, "id: %32[^ ,], index: %d",
 537                         language, &i_track_id ) != 2 )
 538             {
 539                 if( sscanf( line, "id: , index: %d", &i_track_id ) != 1 )
 540                 {
 541                     msg_Warn( p_demux, "reading new track failed" );
 542                     continue;
 543                 }
 544                 language[0] = '\0';
 545             }
 546
 547             p_sys->i_tracks++;
 548             p_sys->track = xrealloc( p_sys->track,
 549                     sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 550
 551             /* Init the track */
 552             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 553             memset( current_tk, 0, sizeof( vobsub_track_t ) );
 554             current_tk->i_current_subtitle = 0;
 555             current_tk->i_subtitles = 0;
 556             current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );
 557             current_tk->i_track_id = i_track_id;
 558             current_tk->i_delay = (int64_t)0;
 559
 560             es_format_Init( &fmt, SPU_ES, VLC_CODEC_SPU );
 561             fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 562             fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 563             fmt.psz_language = language;
 564             if( p_sys->b_palette )
 565             {
 566                 fmt.subs.spu.palette[0] = SPU_PALETTE_DEFINED;
 567                 memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 568             }
 569
 570             current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 571             msg_Dbg( p_demux, "New vobsub track detected: %i [%s]", i_track_id, language );
 572         }
 573         else if( !strncmp( line, "timestamp:", 10 ) )
 574         {
 575             /*
 576              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 577              * loc is the hex location of the spu in the .sub file
 578              */
 579             int h, m, s, ms, count, loc = 0;
 580             int i_sign = 1;
 581             int64_t i_start, i_location = 0;
 582
 583             if( p_sys->i_tracks > 0 &&
 584                 sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 585                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 586             {
 587                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 588                 subtitle_t *current_sub;
 589
 590                 if( line[count-3] == '-' )
 591                 {
 592                     i_sign = -1;
 593                     h = -h;
 594                 }
 595                 i_start = (int64_t) ( h * 3600*1000 +
 596                             m * 60*1000 +
 597                             s * 1000 +
 598                             ms ) * 1000;
 599                 i_location = loc;
 600
 601                 current_tk->i_subtitles++;
 602                 current_tk->p_subtitles =
 603                     xrealloc( current_tk->p_subtitles,
 604                       sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 605                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 606
 607                 current_sub->i_start = i_start * i_sign;
 608                 current_sub->i_start += current_tk->i_delay;
 609                 current_sub->i_vobsub_location = i_location;
 610             }
 611             else
 612             {
 613                 msg_Warn( p_demux, "reading timestamp failed" );
 614             }
 615         }
 616         else if( !strncasecmp( line, "delay:", 6 ) )
 617         {
 618             /*
 619              * delay: [sign]hh:mm:ss:mss
 620              */
 621             int h, m, s, ms, count = 0;
 622             int i_sign = 1;
 623             int64_t i_gap = 0;
 624
 625             if( p_sys->i_tracks > 0 &&
 626                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 627                         &h, &count, &m, &s, &ms ) >= 4 )
 628             {
 629                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 630                 if( line[count-3] == '-' )
 631                 {
 632                     i_sign = -1;
 633                     h = -h;
 634                 }
 635                 i_gap = (int64_t) ( h * 3600*1000 +
 636                             m * 60*1000 +
 637                             s * 1000 +
 638                             ms ) * 1000;
 639
 640                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 641                 msg_Dbg( p_demux, "sign: %+d gap: %+"PRId64" global delay: %+"PRId64"",
 642                          i_sign, i_gap, current_tk->i_delay );
 643             }
 644             else
 645             {
 646                 msg_Warn( p_demux, "reading delay failed" );
 647             }
 648         }
 649     }
 650     return( 0 );
 651 }
 652
 653 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 654 {
 655     demux_sys_t *p_sys = p_demux->p_sys;
 656     uint8_t     *p = p_bk->p_buffer;
 657     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 658     int i;
 659
 660     while( p + 6 < p_end )
 661     {
 662         int i_size = ps_pkt_size( p, p_end - p );
 663         block_t *p_pkt;
 664         int      i_id;
 665         int      i_spu;
 666
 667         if( i_size <= 0 )
 668             break;
 669
 670         if( i_size > p_end - p )
 671         {
 672             msg_Warn( p_demux, "broken PES size" );
 673             break;
 674         }
 675
 676         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 677         {
 678             msg_Warn( p_demux, "invalid PES" );
 679             break;
 680         }
 681
 682         if( p[3] != 0xbd )
 683         {
 684             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 685             p += i_size;
 686             continue;
 687         }
 688
 689         /* Create a block */
 690         p_pkt = block_Alloc( i_size );
 691         if( unlikely(p_pkt == NULL) )
 692             break;
 693         memcpy( p_pkt->p_buffer, p, i_size);
 694         p += i_size;
 695
 696         i_id = ps_pkt_id( p_pkt );
 697         if( (i_id&0xffe0) != 0xbd20 ||
 698             ps_pkt_parse_pes( VLC_OBJECT(p_demux), p_pkt, 1 ) )
 699         {
 700             block_Release( p_pkt );
 701             continue;
 702         }
 703         i_spu = i_id&0x1f;
 704         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 705
 706         for( i = 0; i < p_sys->i_tracks; i++ )
 707         {
 708             vobsub_track_t *p_tk = &p_sys->track[i];
 709
 710             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 711             p_pkt->i_length = 0;
 712
 713             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 714             {
 715                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 716                 p_bk->i_pts = VLC_TICK_INVALID;     /*only first packet has a pts */
 717                 break;
 718             }
 719         }
 720         if( i >= p_sys->i_tracks )
 721         {
 722             block_Release( p_pkt );
 723         }
 724     }
 725
 726     return VLC_SUCCESS;
 727 }
 728