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     vlc_tick_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->p_vobsub_stream = NULL;
 150     p_sys->i_tracks = 0;
 151     p_sys->track = malloc( sizeof( vobsub_track_t ) );
 152     if( unlikely( !p_sys->track ) )
 153         goto error;
 154     p_sys->i_original_frame_width = -1;
 155     p_sys->i_original_frame_height = -1;
 156     p_sys->b_palette = false;
 157     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 158
 159     /* Load the whole file */
 160     TextLoad( &p_sys->txt, p_demux->s );
 161
 162     /* Parse it */
 163     ParseVobSubIDX( p_demux );
 164
 165     /* Unload */
 166     TextUnload( &p_sys->txt );
 167
 168     /* Find the total length of the vobsubs */
 169     p_sys->i_length = 0;
 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 = p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start;
 178             }
 179         }
 180     }
 181     if ( p_sys->i_length != 0)
 182         p_sys->i_length += VLC_TICK_FROM_SEC( 1 );
 183
 184     psz_vobname = strdup( p_demux->psz_url );
 185     if( psz_vobname == NULL )
 186         goto error;
 187
 188     i_len = strlen( psz_vobname );
 189     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 190
 191     /* open file */
 192     p_sys->p_vobsub_stream = vlc_stream_NewURL( p_demux, psz_vobname );
 193     if( p_sys->p_vobsub_stream == NULL )
 194     {
 195         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 196                  psz_vobname );
 197         free( psz_vobname );
 198         goto error;
 199     }
 200     free( psz_vobname );
 201
 202     p_demux->pf_demux = Demux;
 203     p_demux->pf_control = Control;
 204
 205     return VLC_SUCCESS;
 206
 207 error:
 208     /* Clean all subs from all tracks */
 209     for( int i = 0; i < p_sys->i_tracks; i++ )
 210         free( p_sys->track[i].p_subtitles );
 211     free( p_sys->track );
 212     free( p_sys );
 213
 214     return VLC_EGENERIC;
 215 }
 216
 217 /*****************************************************************************
 218  * Close: Close subtitle demux
 219  *****************************************************************************/
 220 static void Close( vlc_object_t *p_this )
 221 {
 222     demux_t *p_demux = (demux_t*)p_this;
 223     demux_sys_t *p_sys = p_demux->p_sys;
 224
 225     if( p_sys->p_vobsub_stream )
 226         vlc_stream_Delete( p_sys->p_vobsub_stream );
 227
 228     /* Clean all subs from all tracks */
 229     for( int i = 0; i < p_sys->i_tracks; i++ )
 230         free( p_sys->track[i].p_subtitles );
 231     free( p_sys->track );
 232     free( p_sys );
 233 }
 234
 235 /*****************************************************************************
 236  * Control:
 237  *****************************************************************************/
 238 static int Control( demux_t *p_demux, int i_query, va_list args )
 239 {
 240     demux_sys_t *p_sys = p_demux->p_sys;
 241     vlc_tick_t i64;
 242     int i;
 243     double *pf, f;
 244
 245     switch( i_query )
 246     {
 247         case DEMUX_CAN_SEEK:
 248             *va_arg( args, bool * ) = true;
 249             return VLC_SUCCESS;
 250
 251         case DEMUX_GET_LENGTH:
 252             *va_arg( args, vlc_tick_t * ) = p_sys->i_length;
 253             return VLC_SUCCESS;
 254
 255         case DEMUX_GET_TIME:
 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                 *va_arg( args, vlc_tick_t * ) = 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, vlc_tick_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 = (vlc_tick_t) f * p_sys->i_length;
 315             return demux_Control(p_demux, DEMUX_SET_TIME, i64, false);
 316
 317         case DEMUX_SET_NEXT_DEMUX_TIME:
 318             p_sys->i_next_demux_date = va_arg( args, vlc_tick_t );
 319             return VLC_SUCCESS;
 320
 321         case DEMUX_CAN_PAUSE:
 322         case DEMUX_SET_PAUSE_STATE:
 323         case DEMUX_CAN_CONTROL_PACE:
 324             return demux_vaControlHelper( p_demux->s, 0, -1, 0, 1, i_query, args );
 325
 326         case DEMUX_GET_PTS_DELAY:
 327         case DEMUX_GET_FPS:
 328         case DEMUX_GET_META:
 329         case DEMUX_GET_TITLE_INFO:
 330         case DEMUX_HAS_UNSUPPORTED_META:
 331         case DEMUX_GET_ATTACHMENTS:
 332         case DEMUX_CAN_RECORD:
 333             return VLC_EGENERIC;
 334
 335         default:
 336             msg_Warn( p_demux, "unknown query in subtitle control" );
 337             return VLC_EGENERIC;
 338     }
 339 }
 340
 341 /*****************************************************************************
 342  * Demux: Send subtitle to decoder
 343  *****************************************************************************/
 344 static int Demux( demux_t *p_demux )
 345 {
 346     demux_sys_t *p_sys = p_demux->p_sys;
 347     vlc_tick_t i_maxdate;
 348     int i_read;
 349
 350     for( int i = 0; i < p_sys->i_tracks; i++ )
 351     {
 352 #define tk p_sys->track[i]
 353         if( tk.i_current_subtitle >= tk.i_subtitles )
 354             continue;
 355
 356         i_maxdate = p_sys->i_next_demux_date;
 357         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 358         {
 359             /* Should not happen */
 360             i_maxdate = tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 361         }
 362
 363         while( tk.i_current_subtitle < tk.i_subtitles &&
 364                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 365         {
 366             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 367             block_t *p_block;
 368             int i_size = 0;
 369
 370             /* first compute SPU size */
 371             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 372             {
 373                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 374             }
 375             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 376
 377             /* Seek at the right place */
 378             if( vlc_stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 379             {
 380                 msg_Warn( p_demux,
 381                           "cannot seek in the VobSub to the correct time %d", i_pos );
 382                 tk.i_current_subtitle++;
 383                 continue;
 384             }
 385
 386             /* allocate a packet */
 387             if( ( p_block = block_Alloc( i_size ) ) == NULL )
 388             {
 389                 tk.i_current_subtitle++;
 390                 continue;
 391             }
 392
 393             /* read data */
 394             i_read = vlc_stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 395             if( i_read <= 6 )
 396             {
 397                 block_Release( p_block );
 398                 tk.i_current_subtitle++;
 399                 continue;
 400             }
 401             p_block->i_buffer = i_read;
 402
 403             /* pts */
 404             p_block->i_pts = VLC_TICK_0 + tk.p_subtitles[tk.i_current_subtitle].i_start;
 405
 406             /* demux this block */
 407             DemuxVobSub( p_demux, p_block );
 408
 409             block_Release( p_block );
 410
 411             tk.i_current_subtitle++;
 412         }
 413 #undef tk
 414     }
 415
 416     /* */
 417     p_sys->i_next_demux_date = 0;
 418
 419     return 1;
 420 }
 421
 422 static int TextLoad( text_t *txt, stream_t *s )
 423 {
 424     char **lines = NULL;
 425     size_t n = 0;
 426
 427     /* load the complete file */
 428     for( ;; )
 429     {
 430         char *psz = vlc_stream_ReadLine( s );
 431         char **ppsz_new;
 432
 433         if( psz == NULL || (n >= INT_MAX/sizeof(char *)) )
 434         {
 435             free( psz );
 436             break;
 437         }
 438
 439         ppsz_new = realloc( lines, (n + 1) * sizeof (char *) );
 440         if( ppsz_new == NULL )
 441         {
 442             free( psz );
 443             break;
 444         }
 445         lines = ppsz_new;
 446         lines[n++] = psz;
 447     }
 448
 449     txt->i_line_count = n;
 450     txt->i_line       = 0;
 451     txt->line         = lines;
 452
 453     return VLC_SUCCESS;
 454 }
 455
 456 static void TextUnload( text_t *txt )
 457 {
 458     for( int i = 0; i < txt->i_line_count; i++ )
 459         free( txt->line[i] );
 460     free( txt->line );
 461
 462     txt->i_line       = 0;
 463     txt->i_line_count = 0;
 464 }
 465
 466 static char *TextGetLine( text_t *txt )
 467 {
 468     if( txt->i_line >= txt->i_line_count )
 469         return( NULL );
 470
 471     return txt->line[txt->i_line++];
 472 }
 473
 474 static int ParseVobSubIDX( demux_t *p_demux )
 475 {
 476     demux_sys_t *p_sys = p_demux->p_sys;
 477     text_t      *txt = &p_sys->txt;
 478     char        *line;
 479
 480     for( ;; )
 481     {
 482         if( ( line = TextGetLine( txt ) ) == NULL )
 483         {
 484             return( VLC_EGENERIC );
 485         }
 486
 487         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 488         {
 489             continue;
 490         }
 491         else if( !strncmp( "size:", line, 5 ) )
 492         {
 493             /* Store the original size of the video */
 494             if( vobsub_size_parse( line, &p_sys->i_original_frame_width,
 495                                    &p_sys->i_original_frame_height ) == VLC_SUCCESS )
 496             {
 497                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 498             }
 499             else
 500             {
 501                 msg_Warn( p_demux, "reading original frame size failed" );
 502             }
 503         }
 504         else if( !strncmp( "palette:", line, 8 ) )
 505         {
 506             if( vobsub_palette_parse( line, p_sys->palette ) == VLC_SUCCESS )
 507             {
 508                 p_sys->b_palette = true;
 509                 msg_Dbg( p_demux, "vobsub palette read" );
 510             }
 511             else
 512             {
 513                 msg_Warn( p_demux, "reading original palette failed" );
 514             }
 515         }
 516         else if( !strncmp( "id:", line, 3 ) )
 517         {
 518             char language[33]; /* Usually 2 or 3 letters, sometimes more.
 519                                   Spec (or lack of) doesn't define any limit */
 520             int i_track_id;
 521             es_format_t fmt;
 522
 523             /* Lets start a new track */
 524             if( sscanf( line, "id: %32[^ ,], index: %d",
 525                         language, &i_track_id ) != 2 )
 526             {
 527                 if( sscanf( line, "id: , index: %d", &i_track_id ) != 1 )
 528                 {
 529                     msg_Warn( p_demux, "reading new track failed" );
 530                     continue;
 531                 }
 532                 language[0] = '\0';
 533             }
 534
 535             p_sys->i_tracks++;
 536             p_sys->track = xrealloc( p_sys->track,
 537                     sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 538
 539             /* Init the track */
 540             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 541             memset( current_tk, 0, sizeof( vobsub_track_t ) );
 542             current_tk->i_current_subtitle = 0;
 543             current_tk->i_subtitles = 0;
 544             current_tk->p_subtitles = xmalloc( sizeof( subtitle_t ) );
 545             current_tk->i_track_id = i_track_id;
 546             current_tk->i_delay = (vlc_tick_t)0;
 547
 548             es_format_Init( &fmt, SPU_ES, VLC_CODEC_SPU );
 549             fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 550             fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 551             fmt.psz_language = language;
 552             if( p_sys->b_palette )
 553             {
 554                 fmt.subs.spu.palette[0] = SPU_PALETTE_DEFINED;
 555                 memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 556             }
 557
 558             current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 559             msg_Dbg( p_demux, "New vobsub track detected: %i [%s]", i_track_id, language );
 560         }
 561         else if( !strncmp( line, "timestamp:", 10 ) )
 562         {
 563             /*
 564              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 565              * loc is the hex location of the spu in the .sub file
 566              */
 567             int h, m, s, ms, count, loc = 0;
 568             int i_sign = 1;
 569             vlc_tick_t i_start;
 570             int64_t i_location = 0;
 571
 572             if( p_sys->i_tracks > 0 &&
 573                 sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 574                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 575             {
 576                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 577                 subtitle_t *current_sub;
 578
 579                 if( line[count-3] == '-' )
 580                 {
 581                     i_sign = -1;
 582                     h = -h;
 583                 }
 584                 i_start = vlc_tick_from_sec( h * 3600 + m * 60 + s ) + VLC_TICK_FROM_MS( ms );
 585                 i_location = loc;
 586
 587                 current_tk->i_subtitles++;
 588                 current_tk->p_subtitles =
 589                     xrealloc( current_tk->p_subtitles,
 590                       sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 591                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 592
 593                 current_sub->i_start = i_start * i_sign;
 594                 current_sub->i_start += current_tk->i_delay;
 595                 current_sub->i_vobsub_location = i_location;
 596             }
 597             else
 598             {
 599                 msg_Warn( p_demux, "reading timestamp failed" );
 600             }
 601         }
 602         else if( !strncasecmp( line, "delay:", 6 ) )
 603         {
 604             /*
 605              * delay: [sign]hh:mm:ss:mss
 606              */
 607             int h, m, s, ms, count = 0;
 608             int i_sign = 1;
 609             vlc_tick_t i_gap = 0;
 610
 611             if( p_sys->i_tracks > 0 &&
 612                 sscanf( line, "%*celay: %d%n:%d:%d:%d",
 613                         &h, &count, &m, &s, &ms ) >= 4 )
 614             {
 615                 vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 616                 if( line[count-3] == '-' )
 617                 {
 618                     i_sign = -1;
 619                     h = -h;
 620                 }
 621                 i_gap = vlc_tick_from_sec( h * 3600 + m * 60 + s ) + VLC_TICK_FROM_MS( ms );
 622
 623                 current_tk->i_delay += i_gap * i_sign;
 624                 msg_Dbg( p_demux, "sign: %+d gap: %+"PRId64" global delay: %+"PRId64"",
 625                          i_sign, i_gap, current_tk->i_delay );
 626             }
 627             else
 628             {
 629                 msg_Warn( p_demux, "reading delay failed" );
 630             }
 631         }
 632     }
 633     return( 0 );
 634 }
 635
 636 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 637 {
 638     demux_sys_t *p_sys = p_demux->p_sys;
 639     uint8_t     *p = p_bk->p_buffer;
 640     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 641     int i;
 642
 643     while( p + 6 < p_end )
 644     {
 645         int i_size = ps_pkt_size( p, p_end - p );
 646         block_t *p_pkt;
 647         int      i_id;
 648         int      i_spu;
 649
 650         if( i_size <= 0 )
 651             break;
 652
 653         if( i_size > p_end - p )
 654         {
 655             msg_Warn( p_demux, "broken PES size" );
 656             break;
 657         }
 658
 659         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 660         {
 661             msg_Warn( p_demux, "invalid PES" );
 662             break;
 663         }
 664
 665         if( p[3] != 0xbd )
 666         {
 667             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 668             p += i_size;
 669             continue;
 670         }
 671
 672         /* Create a block */
 673         p_pkt = block_Alloc( i_size );
 674         if( unlikely(p_pkt == NULL) )
 675             break;
 676         memcpy( p_pkt->p_buffer, p, i_size);
 677         p += i_size;
 678
 679         i_id = ps_pkt_id( p_pkt );
 680         if( (i_id&0xffe0) != 0xbd20 ||
 681             ps_pkt_parse_pes( VLC_OBJECT(p_demux), p_pkt, 1 ) )
 682         {
 683             block_Release( p_pkt );
 684             continue;
 685         }
 686         i_spu = i_id&0x1f;
 687         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 688
 689         for( i = 0; i < p_sys->i_tracks; i++ )
 690         {
 691             vobsub_track_t *p_tk = &p_sys->track[i];
 692
 693             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 694             p_pkt->i_length = 0;
 695
 696             if( p_tk->p_es && p_tk->i_track_id == i_spu )
 697             {
 698                 es_out_Send( p_demux->out, p_tk->p_es, p_pkt );
 699                 p_bk->i_pts = VLC_TICK_INVALID;     /*only first packet has a pts */
 700                 break;
 701             }
 702         }
 703         if( i >= p_sys->i_tracks )
 704         {
 705             block_Release( p_pkt );
 706         }
 707     }
 708
 709     return VLC_SUCCESS;
 710 }
 711