git.sesse.net Git - vlc/blob - 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 "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_out_id_t *p_es;
  79     int         i_track_id;
  80
  81     int         i_current_subtitle;
  82     int         i_subtitles;
  83     subtitle_t  *p_subtitles;
  84
  85     int64_t     i_delay;
  86 } vobsub_track_t;
  87
  88 struct demux_sys_t
  89 {
  90     int64_t        i_next_demux_date;
  91     int64_t        i_length;
  92
  93     text_t         txt;
  94     stream_t       *p_vobsub_stream;
  95
  96     /* all tracks */
  97     int            i_tracks;
  98     vobsub_track_t *track;
  99
 100     int            i_original_frame_width;
 101     int            i_original_frame_height;
 102     bool           b_palette;
 103     uint32_t       palette[16];
 104 };
 105
 106
 107 static int Demux( demux_t * );
 108 static int Control( demux_t *, int, va_list );
 109
 110 static int  TextLoad( text_t *, stream_t *s );
 111 static void TextUnload( text_t * );
 112 static int ParseVobSubIDX( demux_t * );
 113 static int DemuxVobSub( demux_t *, block_t *);
 114
 115 /*****************************************************************************
 116  * Module initializer
 117  *****************************************************************************/
 118 static int Open ( vlc_object_t *p_this )
 119 {
 120     demux_t     *p_demux = (demux_t*)p_this;
 121     demux_sys_t *p_sys;
 122     char *psz_vobname, *s;
 123     int i_len;
 124
 125     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 126     {
 127         if( !strcasestr( s, "# VobSub index file" ) )
 128         {
 129             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 130             free( s );
 131             if( stream_Seek( p_demux->s, 0 ) )
 132             {
 133                 msg_Warn( p_demux, "failed to rewind" );
 134             }
 135             return VLC_EGENERIC;
 136         }
 137         free( s );
 138     }
 139     else
 140     {
 141         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 142         return VLC_EGENERIC;
 143     }
 144
 145     /* */
 146     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 147     if( unlikely( !p_sys ) )
 148         return VLC_ENOMEM;
 149
 150     p_sys->i_length = 0;
 151     p_sys->p_vobsub_stream = NULL;
 152     p_sys->i_tracks = 0;
 153     p_sys->track = malloc( sizeof( vobsub_track_t ) );
 154     if( unlikely( !p_sys->track ) )
 155         goto error;
 156     p_sys->i_original_frame_width = -1;
 157     p_sys->i_original_frame_height = -1;
 158     p_sys->b_palette = false;
 159     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 160
 161     /* Load the whole file */
 162     TextLoad( &p_sys->txt, p_demux->s );
 163
 164     /* Parse it */
 165     ParseVobSubIDX( p_demux );
 166
 167     /* Unload */
 168     TextUnload( &p_sys->txt );
 169
 170     /* Find the total length of the vobsubs */
 171     if( p_sys->i_tracks > 0 )
 172     {
 173         for( int i = 0; i < p_sys->i_tracks; i++ )
 174         {
 175             if( p_sys->track[i].i_subtitles > 1 )
 176             {
 177                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 178                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 179             }
 180         }
 181     }
 182
 183     if( asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_location ) == -1 )
 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 = stream_UrlNew( 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         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_GET_LENGTH:
 246             pi64 = (int64_t*)va_arg( args, int64_t * );
 247             *pi64 = (int64_t) p_sys->i_length;
 248             return VLC_SUCCESS;
 249
 250         case DEMUX_GET_TIME:
 251             pi64 = (int64_t*)va_arg( args, int64_t * );
 252             for( i = 0; i < p_sys->i_tracks; i++ )
 253             {
 254                 bool b_selected;
 255                 /* Check the ES is selected */
 256                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 257                                 p_sys->track[i].p_es, &b_selected );
 258                 if( b_selected ) break;
 259             }
 260             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 261             {
 262                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 263                 return VLC_SUCCESS;
 264             }
 265             return VLC_EGENERIC;
 266
 267         case DEMUX_SET_TIME:
 268             i64 = (int64_t)va_arg( args, int64_t );
 269             for( i = 0; i < p_sys->i_tracks; i++ )
 270             {
 271                 p_sys->track[i].i_current_subtitle = 0;
 272                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 273                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 274                 {
 275                     p_sys->track[i].i_current_subtitle++;
 276                 }
 277
 278                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 279                     return VLC_EGENERIC;
 280             }
 281             return VLC_SUCCESS;
 282
 283         case DEMUX_GET_POSITION:
 284             pf = (double*)va_arg( args, double * );
 285             for( i = 0; i < p_sys->i_tracks; i++ )
 286             {
 287                 bool b_selected;
 288                 /* Check the ES is selected */
 289                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 290                                 p_sys->track[i].p_es, &b_selected );
 291                 if( b_selected ) break;
 292             }
 293             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 294             {
 295                 *pf = 1.0;
 296             }
 297             else if( p_sys->track[i].i_subtitles > 0 )
 298             {
 299                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 300                       (double)p_sys->i_length;
 301             }
 302             else
 303             {
 304                 *pf = 0.0;
 305             }
 306             return VLC_SUCCESS;
 307
 308         case DEMUX_SET_POSITION:
 309             f = (double)va_arg( args, double );
 310             i64 = (int64_t) f * p_sys->i_length;
 311
 312             for( i = 0; i < p_sys->i_tracks; i++ )
 313             {
 314                 p_sys->track[i].i_current_subtitle = 0;
 315                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 316                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 317                 {
 318                     p_sys->track[i].i_current_subtitle++;
 319                 }
 320                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 321                     return VLC_EGENERIC;
 322             }
 323             return VLC_SUCCESS;
 324
 325         case DEMUX_SET_NEXT_DEMUX_TIME:
 326             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 327             return VLC_SUCCESS;
 328
 329         case DEMUX_GET_PTS_DELAY:
 330         case DEMUX_GET_FPS:
 331         case DEMUX_GET_META:
 332         case DEMUX_GET_TITLE_INFO:
 333         case DEMUX_HAS_UNSUPPORTED_META:
 334         case DEMUX_GET_ATTACHMENTS:
 335         case DEMUX_CAN_RECORD:
 336             return VLC_EGENERIC;
 337
 338         default:
 339             msg_Warn( p_demux, "unknown query in subtitle control" );
 340             return VLC_EGENERIC;
 341     }
 342 }
 343
 344 /*****************************************************************************
 345  * Demux: Send subtitle to decoder
 346  *****************************************************************************/
 347 static int Demux( demux_t *p_demux )
 348 {
 349     demux_sys_t *p_sys = p_demux->p_sys;
 350     int64_t i_maxdate;
 351     int i_read;
 352
 353     for( int i = 0; i < p_sys->i_tracks; i++ )
 354     {
 355 #define tk p_sys->track[i]
 356         if( tk.i_current_subtitle >= tk.i_subtitles )
 357             continue;
 358
 359         i_maxdate = p_sys->i_next_demux_date;
 360         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 361         {
 362             /* Should not happen */
 363             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 364         }
 365
 366         while( tk.i_current_subtitle < tk.i_subtitles &&
 367                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 368         {
 369             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 370             block_t *p_block;
 371             int i_size = 0;
 372
 373             /* first compute SPU size */
 374             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 375             {
 376                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 377             }
 378             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 379
 380             /* Seek at the right place */
 381             if( stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 382             {
 383                 msg_Warn( p_demux,
 384                           "cannot seek in the VobSub to the correct time %d", i_pos );
 385                 tk.i_current_subtitle++;
 386                 continue;
 387             }
 388
 389             /* allocate a packet */
 390             if( ( p_block = block_Alloc( i_size ) ) == NULL )
 391             {
 392                 tk.i_current_subtitle++;
 393                 continue;
 394             }
 395
 396             /* read data */
 397             i_read = stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 398             if( i_read <= 6 )
 399             {
 400                 block_Release( p_block );
 401                 tk.i_current_subtitle++;
 402                 continue;
 403             }
 404             p_block->i_buffer = i_read;
 405
 406             /* pts */
 407             p_block->i_pts = VLC_TS_0 + tk.p_subtitles[tk.i_current_subtitle].i_start;
 408
 409             /* demux this block */
 410             DemuxVobSub( p_demux, p_block );
 411
 412             tk.i_current_subtitle++;
 413         }
 414 #undef tk
 415     }
 416
 417     /* */
 418     p_sys->i_next_demux_date = 0;
 419
 420     return 1;
 421 }
 422
 423 static int TextLoad( text_t *txt, stream_t *s )
 424 {
 425     char **lines = NULL;
 426     size_t n = 0;
 427
 428     /* load the complete file */
 429     for( ;; )
 430     {
 431         char *psz = stream_ReadLine( s );
 432         char **ppsz_new;
 433
 434         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 435         {
 436             free( psz );
 437             break;
 438         }
 439
 440         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 441         if( ppsz_new == NULL )
 442         {
 443             free( psz );
 444             break;
 445         }
 446         lines = ppsz_new;
 447         lines[n++] = psz;
 448     }
 449
 450     txt->i_line_count = n;
 451     txt->i_line       = 0;
 452     txt->line         = lines;
 453
 454     return VLC_SUCCESS;
 455 }
 456
 457 static void TextUnload( text_t *txt )
 458 {
 459     for( int i = 0; i < txt->i_line_count; i++ )
 460         free( txt->line[i] );
 461     free( txt->line );
 462
 463     txt->i_line       = 0;
 464     txt->i_line_count = 0;
 465 }
 466
 467 static char *TextGetLine( text_t *txt )
 468 {
 469     if( txt->i_line >= txt->i_line_count )
 470         return( NULL );
 471
 472     return txt->line[txt->i_line++];
 473 }
 474
 475 static int ParseVobSubIDX( demux_t *p_demux )
 476 {
 477     demux_sys_t *p_sys = p_demux->p_sys;
 478     text_t      *txt = &p_sys->txt;
 479     char        *line;
 480     vobsub_track_t *current_tk = NULL;
 481
 482     for( ;; )
 483     {
 484         if( ( line = TextGetLine( txt ) ) == NULL )
 485         {
 486             return( VLC_EGENERIC );
 487         }
 488
 489         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 490         {
 491             continue;
 492         }
 493         else if( !strncmp( "size:", line, 5 ) )
 494         {
 495             /* Store the original size of the video */
 496             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 497                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 498             {
 499                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 500             }
 501             else
 502             {
 503                 msg_Warn( p_demux, "reading original frame size failed" );
 504             }
 505         }
 506         else if( !strncmp( "palette:", line, 8 ) )
 507         {
 508             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 509             {
 510                 p_sys->b_palette = true;
 511                 msg_Dbg( p_demux, "vobsub palette read" );
 512             }
 513             else
 514             {
 515                 msg_Warn( p_demux, "reading original palette failed" );
 516             }
 517         }
 518         else if( !strncmp( "id:", line, 3 ) )
 519         {
 520             char language[33]; /* Usually 2 or 3 letters, sometimes more.
 521                                   Spec (or lack of) doesn't define any limit */
 522             int i_track_id;
 523             es_format_t fmt;
 524
 525             /* Lets start a new track */
 526             if( sscanf( line, "id: %32[^ ,], index: %d",
 527                         language, &i_track_id ) != 2 )
 528             {
 529                 if( sscanf( line, "id: , index: %d", &i_track_id ) != 1 )
 530                 {
 531                     msg_Warn( p_demux, "reading new track failed" );
 532                     continue;
 533                 }
 534                 language[0] = '\0';
 535             }
 536
 537             p_sys->i_tracks++;
 538             p_sys->track = xrealloc( p_sys->track,
 539                     sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 540
 541             /* Init the track */
 542             current_tk = &p_sys->track[p_sys->i_tracks - 1];
 543             memset( current_tk, 0, sizeof( vobsub_track_t ) );
 544             current_tk->i_current_subtitle = 0;
 545             current_tk->i_subtitles = 0;
 546             current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );
 547             current_tk->i_track_id = i_track_id;
 548             current_tk->i_delay = (int64_t)0;
 549
 550             es_format_Init( &fmt, SPU_ES, VLC_CODEC_SPU );
 551             fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 552             fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 553             fmt.psz_language = language;
 554             if( p_sys->b_palette )
 555             {
 556                 fmt.subs.spu.palette[0] = 0xBeef;
 557                 memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 558             }
 559
 560             current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 561             msg_Dbg( p_demux, "New vobsub track detected: %i [%s]", i_track_id, language );
 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_Alloc( i_size );
 681         if( unlikely(p_pkt == NULL) )
 682             break;
 683         memcpy( p_pkt->p_buffer, p, i_size);
 684         p += i_size;
 685
 686         i_id = ps_pkt_id( p_pkt );
 687         if( (i_id&0xffe0) != 0xbd20 ||
 688             ps_pkt_parse_pes( p_pkt, 1 ) )
 689         {
 690             block_Release( p_pkt );
 691             continue;
 692         }
 693         i_spu = i_id&0x1f;
 694         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 695
 696         for( i = 0; i < p_sys->i_tracks; i++ )
 697         {
 698             vobsub_track_t *p_tk = &p_sys->track[i];
 699
 700             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 701             p_pkt->i_length = 0;
 702
 703             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 704             {
 705                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 706                 p_bk->i_pts = VLC_TS_INVALID;     /*only first packet has a pts */
 707                 break;
 708             }
 709         }
 710         if( i >= p_sys->i_tracks )
 711         {
 712             block_Release( p_pkt );
 713         }
 714     }
 715
 716     return VLC_SUCCESS;
 717 }
 718