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     if( asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_location ) == -1 )
 183         goto error;
 184
 185     i_len = strlen( psz_vobname );
 186     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 187
 188     /* open file */
 189     p_sys->p_vobsub_stream = vlc_stream_NewURL( p_demux, psz_vobname );
 190     if( p_sys->p_vobsub_stream == NULL )
 191     {
 192         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 193                  psz_vobname );
 194         free( psz_vobname );
 195         goto error;
 196     }
 197     free( psz_vobname );
 198
 199     p_demux->pf_demux = Demux;
 200     p_demux->pf_control = Control;
 201
 202     return VLC_SUCCESS;
 203
 204 error:
 205     /* Clean all subs from all tracks */
 206     for( int i = 0; i < p_sys->i_tracks; i++ )
 207         free( p_sys->track[i].p_subtitles );
 208     free( p_sys->track );
 209     free( p_sys );
 210
 211     return VLC_EGENERIC;
 212 }
 213
 214 /*****************************************************************************
 215  * Close: Close subtitle demux
 216  *****************************************************************************/
 217 static void Close( vlc_object_t *p_this )
 218 {
 219     demux_t *p_demux = (demux_t*)p_this;
 220     demux_sys_t *p_sys = p_demux->p_sys;
 221
 222     if( p_sys->p_vobsub_stream )
 223         vlc_stream_Delete( p_sys->p_vobsub_stream );
 224
 225     /* Clean all subs from all tracks */
 226     for( int i = 0; i < p_sys->i_tracks; i++ )
 227         free( p_sys->track[i].p_subtitles );
 228     free( p_sys->track );
 229     free( p_sys );
 230 }
 231
 232 /*****************************************************************************
 233  * Control:
 234  *****************************************************************************/
 235 static int Control( demux_t *p_demux, int i_query, va_list args )
 236 {
 237     demux_sys_t *p_sys = p_demux->p_sys;
 238     int64_t *pi64, i64;
 239     int i;
 240     double *pf, f;
 241
 242     switch( i_query )
 243     {
 244         case DEMUX_CAN_SEEK:
 245             *va_arg( args, bool * ) = true;
 246             return VLC_SUCCESS;
 247
 248         case DEMUX_GET_LENGTH:
 249             pi64 = va_arg( args, int64_t * );
 250             *pi64 = (int64_t) p_sys->i_length;
 251             return VLC_SUCCESS;
 252
 253         case DEMUX_GET_TIME:
 254             pi64 = va_arg( args, int64_t * );
 255             for( i = 0; i < p_sys->i_tracks; i++ )
 256             {
 257                 bool b_selected;
 258                 /* Check the ES is selected */
 259                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 260                                 p_sys->track[i].p_es, &b_selected );
 261                 if( b_selected ) break;
 262             }
 263             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 264             {
 265                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 266                 return VLC_SUCCESS;
 267             }
 268             return VLC_EGENERIC;
 269
 270         case DEMUX_SET_TIME:
 271             i64 = va_arg( args, int64_t );
 272             for( i = 0; i < p_sys->i_tracks; i++ )
 273             {
 274                 p_sys->track[i].i_current_subtitle = 0;
 275                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 276                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 277                 {
 278                     p_sys->track[i].i_current_subtitle++;
 279                 }
 280
 281                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 282                     return VLC_EGENERIC;
 283             }
 284             return VLC_SUCCESS;
 285
 286         case DEMUX_GET_POSITION:
 287             pf = va_arg( args, double * );
 288             for( i = 0; i < p_sys->i_tracks; i++ )
 289             {
 290                 bool b_selected;
 291                 /* Check the ES is selected */
 292                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 293                                 p_sys->track[i].p_es, &b_selected );
 294                 if( b_selected ) break;
 295             }
 296             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 297             {
 298                 *pf = 1.0;
 299             }
 300             else if( p_sys->track[i].i_subtitles > 0 )
 301             {
 302                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 303                       (double)p_sys->i_length;
 304             }
 305             else
 306             {
 307                 *pf = 0.0;
 308             }
 309             return VLC_SUCCESS;
 310
 311         case DEMUX_SET_POSITION:
 312             f = va_arg( args, double );
 313             i64 = (int64_t) f * p_sys->i_length;
 314
 315             for( i = 0; i < p_sys->i_tracks; i++ )
 316             {
 317                 p_sys->track[i].i_current_subtitle = 0;
 318                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 319                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 320                 {
 321                     p_sys->track[i].i_current_subtitle++;
 322                 }
 323                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 324                     return VLC_EGENERIC;
 325             }
 326             return VLC_SUCCESS;
 327
 328         case DEMUX_SET_NEXT_DEMUX_TIME:
 329             p_sys->i_next_demux_date = va_arg( args, int64_t );
 330             return VLC_SUCCESS;
 331
 332         case DEMUX_GET_PTS_DELAY:
 333         case DEMUX_GET_FPS:
 334         case DEMUX_GET_META:
 335         case DEMUX_GET_TITLE_INFO:
 336         case DEMUX_HAS_UNSUPPORTED_META:
 337         case DEMUX_GET_ATTACHMENTS:
 338         case DEMUX_CAN_RECORD:
 339             return VLC_EGENERIC;
 340
 341         default:
 342             msg_Warn( p_demux, "unknown query in subtitle control" );
 343             return VLC_EGENERIC;
 344     }
 345 }
 346
 347 /*****************************************************************************
 348  * Demux: Send subtitle to decoder
 349  *****************************************************************************/
 350 static int Demux( demux_t *p_demux )
 351 {
 352     demux_sys_t *p_sys = p_demux->p_sys;
 353     int64_t i_maxdate;
 354     int i_read;
 355
 356     for( int i = 0; i < p_sys->i_tracks; i++ )
 357     {
 358 #define tk p_sys->track[i]
 359         if( tk.i_current_subtitle >= tk.i_subtitles )
 360             continue;
 361
 362         i_maxdate = p_sys->i_next_demux_date;
 363         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 364         {
 365             /* Should not happen */
 366             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 367         }
 368
 369         while( tk.i_current_subtitle < tk.i_subtitles &&
 370                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 371         {
 372             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 373             block_t *p_block;
 374             int i_size = 0;
 375
 376             /* first compute SPU size */
 377             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 378             {
 379                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 380             }
 381             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 382
 383             /* Seek at the right place */
 384             if( vlc_stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 385             {
 386                 msg_Warn( p_demux,
 387                           "cannot seek in the VobSub to the correct time %d", i_pos );
 388                 tk.i_current_subtitle++;
 389                 continue;
 390             }
 391
 392             /* allocate a packet */
 393             if( ( p_block = block_Alloc( i_size ) ) == NULL )
 394             {
 395                 tk.i_current_subtitle++;
 396                 continue;
 397             }
 398
 399             /* read data */
 400             i_read = vlc_stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 401             if( i_read <= 6 )
 402             {
 403                 block_Release( p_block );
 404                 tk.i_current_subtitle++;
 405                 continue;
 406             }
 407             p_block->i_buffer = i_read;
 408
 409             /* pts */
 410             p_block->i_pts = VLC_TS_0 + tk.p_subtitles[tk.i_current_subtitle].i_start;
 411
 412             /* demux this block */
 413             DemuxVobSub( p_demux, p_block );
 414
 415             block_Release( p_block );
 416
 417             tk.i_current_subtitle++;
 418         }
 419 #undef tk
 420     }
 421
 422     /* */
 423     p_sys->i_next_demux_date = 0;
 424
 425     return 1;
 426 }
 427
 428 static int TextLoad( text_t *txt, stream_t *s )
 429 {
 430     char **lines = NULL;
 431     size_t n = 0;
 432
 433     /* load the complete file */
 434     for( ;; )
 435     {
 436         char *psz = vlc_stream_ReadLine( s );
 437         char **ppsz_new;
 438
 439         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 440         {
 441             free( psz );
 442             break;
 443         }
 444
 445         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 446         if( ppsz_new == NULL )
 447         {
 448             free( psz );
 449             break;
 450         }
 451         lines = ppsz_new;
 452         lines[n++] = psz;
 453     }
 454
 455     txt->i_line_count = n;
 456     txt->i_line       = 0;
 457     txt->line         = lines;
 458
 459     return VLC_SUCCESS;
 460 }
 461
 462 static void TextUnload( text_t *txt )
 463 {
 464     for( int i = 0; i < txt->i_line_count; i++ )
 465         free( txt->line[i] );
 466     free( txt->line );
 467
 468     txt->i_line       = 0;
 469     txt->i_line_count = 0;
 470 }
 471
 472 static char *TextGetLine( text_t *txt )
 473 {
 474     if( txt->i_line >= txt->i_line_count )
 475         return( NULL );
 476
 477     return txt->line[txt->i_line++];
 478 }
 479
 480 static int ParseVobSubIDX( demux_t *p_demux )
 481 {
 482     demux_sys_t *p_sys = p_demux->p_sys;
 483     text_t      *txt = &p_sys->txt;
 484     char        *line;
 485
 486     for( ;; )
 487     {
 488         if( ( line = TextGetLine( txt ) ) == NULL )
 489         {
 490             return( VLC_EGENERIC );
 491         }
 492
 493         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 494         {
 495             continue;
 496         }
 497         else if( !strncmp( "size:", line, 5 ) )
 498         {
 499             /* Store the original size of the video */
 500             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 501                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 502             {
 503                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 504             }
 505             else
 506             {
 507                 msg_Warn( p_demux, "reading original frame size failed" );
 508             }
 509         }
 510         else if( !strncmp( "palette:", line, 8 ) )
 511         {
 512             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 513             {
 514                 p_sys->b_palette = true;
 515                 msg_Dbg( p_demux, "vobsub palette read" );
 516             }
 517             else
 518             {
 519                 msg_Warn( p_demux, "reading original palette failed" );
 520             }
 521         }
 522         else if( !strncmp( "id:", line, 3 ) )
 523         {
 524             char language[33]; /* Usually 2 or 3 letters, sometimes more.
 525                                   Spec (or lack of) doesn't define any limit */
 526             int i_track_id;
 527             es_format_t fmt;
 528
 529             /* Lets start a new track */
 530             if( sscanf( line, "id: %32[^ ,], index: %d",
 531                         language, &i_track_id ) != 2 )
 532             {
 533                 if( sscanf( line, "id: , index: %d", &i_track_id ) != 1 )
 534                 {
 535                     msg_Warn( p_demux, "reading new track failed" );
 536                     continue;
 537                 }
 538                 language[0] = '\0';
 539             }
 540
 541             p_sys->i_tracks++;
 542             p_sys->track = xrealloc( p_sys->track,
 543                     sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 544
 545             /* Init the track */
 546             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 547             memset( current_tk, 0, sizeof( vobsub_track_t ) );
 548             current_tk->i_current_subtitle = 0;
 549             current_tk->i_subtitles = 0;
 550             current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );
 551             current_tk->i_track_id = i_track_id;
 552             current_tk->i_delay = (int64_t)0;
 553
 554             es_format_Init( &fmt, SPU_ES, VLC_CODEC_SPU );
 555             fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 556             fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 557             fmt.psz_language = language;
 558             if( p_sys->b_palette )
 559             {
 560                 fmt.subs.spu.palette[0] = SPU_PALETTE_DEFINED;
 561                 memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 562             }
 563
 564             current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 565             msg_Dbg( p_demux, "New vobsub track detected: %i [%s]", i_track_id, language );
 566         }
 567         else if( !strncmp( line, "timestamp:", 10 ) )
 568         {
 569             /*
 570              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 571              * loc is the hex location of the spu in the .sub file
 572              */
 573             int h, m, s, ms, count, loc = 0;
 574             int i_sign = 1;
 575             int64_t i_start, i_location = 0;
 576
 577             if( p_sys->i_tracks > 0 &&
 578                 sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 579                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 580             {
 581                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 582                 subtitle_t *current_sub;
 583
 584                 if( line[count-3] == '-' )
 585                 {
 586                     i_sign = -1;
 587                     h = -h;
 588                 }
 589                 i_start = (int64_t) ( h * 3600*1000 +
 590                             m * 60*1000 +
 591                             s * 1000 +
 592                             ms ) * 1000;
 593                 i_location = loc;
 594
 595                 current_tk->i_subtitles++;
 596                 current_tk->p_subtitles =
 597                     xrealloc( current_tk->p_subtitles,
 598                       sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 599                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 600
 601                 current_sub->i_start = i_start * i_sign;
 602                 current_sub->i_start += current_tk->i_delay;
 603                 current_sub->i_vobsub_location = i_location;
 604             }
 605             else
 606             {
 607                 msg_Warn( p_demux, "reading timestamp failed" );
 608             }
 609         }
 610         else if( !strncasecmp( line, "delay:", 6 ) )
 611         {
 612             /*
 613              * delay: [sign]hh:mm:ss:mss
 614              */
 615             int h, m, s, ms, count = 0;
 616             int i_sign = 1;
 617             int64_t i_gap = 0;
 618
 619             if( p_sys->i_tracks > 0 &&
 620                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 621                         &h, &count, &m, &s, &ms ) >= 4 )
 622             {
 623                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 624                 if( line[count-3] == '-' )
 625                 {
 626                     i_sign = -1;
 627                     h = -h;
 628                 }
 629                 i_gap = (int64_t) ( h * 3600*1000 +
 630                             m * 60*1000 +
 631                             s * 1000 +
 632                             ms ) * 1000;
 633
 634                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 635                 msg_Dbg( p_demux, "sign: %+d gap: %+"PRId64" global delay: %+"PRId64"",
 636                          i_sign, i_gap, current_tk->i_delay );
 637             }
 638             else
 639             {
 640                 msg_Warn( p_demux, "reading delay failed" );
 641             }
 642         }
 643     }
 644     return( 0 );
 645 }
 646
 647 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 648 {
 649     demux_sys_t *p_sys = p_demux->p_sys;
 650     uint8_t     *p = p_bk->p_buffer;
 651     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 652     int i;
 653
 654     while( p + 6 < p_end )
 655     {
 656         int i_size = ps_pkt_size( p, p_end - p );
 657         block_t *p_pkt;
 658         int      i_id;
 659         int      i_spu;
 660
 661         if( i_size <= 0 )
 662             break;
 663
 664         if( i_size > p_end - p )
 665         {
 666             msg_Warn( p_demux, "broken PES size" );
 667             break;
 668         }
 669
 670         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 671         {
 672             msg_Warn( p_demux, "invalid PES" );
 673             break;
 674         }
 675
 676         if( p[3] != 0xbd )
 677         {
 678             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 679             p += i_size;
 680             continue;
 681         }
 682
 683         /* Create a block */
 684         p_pkt = block_Alloc( i_size );
 685         if( unlikely(p_pkt == NULL) )
 686             break;
 687         memcpy( p_pkt->p_buffer, p, i_size);
 688         p += i_size;
 689
 690         i_id = ps_pkt_id( p_pkt );
 691         if( (i_id&0xffe0) != 0xbd20 ||
 692             ps_pkt_parse_pes( VLC_OBJECT(p_demux), p_pkt, 1 ) )
 693         {
 694             block_Release( p_pkt );
 695             continue;
 696         }
 697         i_spu = i_id&0x1f;
 698         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 699
 700         for( i = 0; i < p_sys->i_tracks; i++ )
 701         {
 702             vobsub_track_t *p_tk = &p_sys->track[i];
 703
 704             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 705             p_pkt->i_length = 0;
 706
 707             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 708             {
 709                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 710                 p_bk->i_pts = VLC_TS_INVALID;     /*only first packet has a pts */
 711                 break;
 712             }
 713         }
 714         if( i >= p_sys->i_tracks )
 715         {
 716             block_Release( p_pkt );
 717         }
 718     }
 719
 720     return VLC_SUCCESS;
 721 }
 722