git.sesse.net Git - vlc/blob - modules/demux/vobsub.c

   1 /*****************************************************************************
   2  * subtitle.c: Demux vobsub files.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 the VideoLAN team
   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
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 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 General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc/vlc.h>
  33
  34 #include <errno.h>
  35 #include <sys/types.h>
  36
  37 #include <vlc_demux.h>
  38 #include <vlc_charset.h>
  39
  40 #include "ps.h"
  41
  42 #define MAX_LINE 8192
  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( _("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" );
  59     add_shortcut( "subtitle" );
  60 vlc_module_end();
  61
  62 /*****************************************************************************
  63  * Prototypes:
  64  *****************************************************************************/
  65
  66 typedef struct
  67 {
  68     int     i_line_count;
  69     int     i_line;
  70     char    **line;
  71 } text_t;
  72 static int  TextLoad( text_t *, stream_t *s );
  73 static void TextUnload( text_t * );
  74
  75 typedef struct
  76 {
  77     int64_t i_start;
  78     int     i_vobsub_location;
  79 } subtitle_t;
  80
  81 typedef struct
  82 {
  83     es_format_t fmt;
  84     es_out_id_t *p_es;
  85     int         i_track_id;
  86
  87     int         i_current_subtitle;
  88     int         i_subtitles;
  89     subtitle_t  *p_subtitles;
  90
  91     int64_t     i_delay;
  92 } vobsub_track_t;
  93
  94 struct demux_sys_t
  95 {
  96     int64_t     i_next_demux_date;
  97     int64_t     i_length;
  98
  99     text_t      txt;
 100     stream_t    *p_vobsub_stream;
 101
 102     /* all tracks */
 103     int            i_tracks;
 104     vobsub_track_t *track;
 105
 106     int         i_original_frame_width;
 107     int         i_original_frame_height;
 108     bool  b_palette;
 109     uint32_t    palette[16];
 110 };
 111
 112 static int Demux( demux_t * );
 113 static int Control( demux_t *, int, va_list );
 114
 115 static int ParseVobSubIDX( demux_t * );
 116 static int DemuxVobSub( demux_t *, block_t *);
 117
 118 /*****************************************************************************
 119  * Module initializer
 120  *****************************************************************************/
 121 static int Open ( vlc_object_t *p_this )
 122 {
 123     demux_t     *p_demux = (demux_t*)p_this;
 124     demux_sys_t *p_sys;
 125     char *psz_vobname, *s;
 126     int i_len;
 127
 128     if( ( s = stream_ReadLine( p_demux->s ) ) != 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             if( stream_Seek( p_demux->s, 0 ) )
 135             {
 136                 msg_Warn( p_demux, "failed to rewind" );
 137             }
 138             return VLC_EGENERIC;
 139         }
 140         free( s );
 141
 142     }
 143     else
 144     {
 145         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 146         return VLC_EGENERIC;
 147     }
 148
 149     p_demux->pf_demux = Demux;
 150     p_demux->pf_control = Control;
 151     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 152     p_sys->i_length = 0;
 153     p_sys->p_vobsub_stream = NULL;
 154     p_sys->i_tracks = 0;
 155     p_sys->track = (vobsub_track_t *)malloc( sizeof( vobsub_track_t ) );
 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         int i;
 174         for( i = 0; i < p_sys->i_tracks; i++ )
 175         {
 176             if( p_sys->track[i].i_subtitles > 1 )
 177             {
 178                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 179                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 180             }
 181         }
 182     }
 183
 184     asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_path );
 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 = stream_UrlNew( 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         free( p_sys );
 196         return VLC_EGENERIC;
 197     }
 198     free( psz_vobname );
 199
 200     return VLC_SUCCESS;
 201 }
 202
 203 /*****************************************************************************
 204  * Close: Close subtitle demux
 205  *****************************************************************************/
 206 static void Close( vlc_object_t *p_this )
 207 {
 208     int i;
 209     demux_t *p_demux = (demux_t*)p_this;
 210     demux_sys_t *p_sys = p_demux->p_sys;
 211
 212     /* Clean all subs from all tracks */
 213     for( i = 0; i < p_sys->i_tracks; i++ )
 214         free( p_sys->track[i].p_subtitles );
 215
 216     free( p_sys->track );
 217
 218     if( p_sys->p_vobsub_stream )
 219         stream_Delete( p_sys->p_vobsub_stream );
 220
 221     free( p_sys );
 222 }
 223
 224 /*****************************************************************************
 225  * Control:
 226  *****************************************************************************/
 227 static int Control( demux_t *p_demux, int i_query, va_list args )
 228 {
 229     demux_sys_t *p_sys = p_demux->p_sys;
 230     int64_t *pi64, i64;
 231     int i;
 232     double *pf, f;
 233
 234     switch( i_query )
 235     {
 236         case DEMUX_GET_LENGTH:
 237             pi64 = (int64_t*)va_arg( args, int64_t * );
 238             *pi64 = (int64_t) p_sys->i_length;
 239             return VLC_SUCCESS;
 240
 241         case DEMUX_GET_TIME:
 242             pi64 = (int64_t*)va_arg( args, int64_t * );
 243             for( i = 0; i < p_sys->i_tracks; i++ )
 244             {
 245                 bool b_selected;
 246                 /* Check the ES is selected */
 247                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 248                                 p_sys->track[i].p_es, &b_selected );
 249                 if( b_selected ) break;
 250             }
 251             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 252             {
 253                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 254                 return VLC_SUCCESS;
 255             }
 256             return VLC_EGENERIC;
 257
 258         case DEMUX_SET_TIME:
 259             i64 = (int64_t)va_arg( args, int64_t );
 260             for( i = 0; i < p_sys->i_tracks; i++ )
 261             {
 262                 p_sys->track[i].i_current_subtitle = 0;
 263                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 264                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 265                 {
 266                     p_sys->track[i].i_current_subtitle++;
 267                 }
 268
 269                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 270                     return VLC_EGENERIC;
 271             }
 272             return VLC_SUCCESS;
 273
 274         case DEMUX_GET_POSITION:
 275             pf = (double*)va_arg( args, double * );
 276             for( i = 0; i < p_sys->i_tracks; i++ )
 277             {
 278                 bool b_selected;
 279                 /* Check the ES is selected */
 280                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 281                                 p_sys->track[i].p_es, &b_selected );
 282                 if( b_selected ) break;
 283             }
 284             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 285             {
 286                 *pf = 1.0;
 287             }
 288             else if( p_sys->track[i].i_subtitles > 0 )
 289             {
 290                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 291                       (double)p_sys->i_length;
 292             }
 293             else
 294             {
 295                 *pf = 0.0;
 296             }
 297             return VLC_SUCCESS;
 298
 299         case DEMUX_SET_POSITION:
 300             f = (double)va_arg( args, double );
 301             i64 = (int64_t) f * p_sys->i_length;
 302
 303             for( i = 0; i < p_sys->i_tracks; i++ )
 304             {
 305                 p_sys->track[i].i_current_subtitle = 0;
 306                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 307                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 308                 {
 309                     p_sys->track[i].i_current_subtitle++;
 310                 }
 311                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 312                     return VLC_EGENERIC;
 313             }
 314             return VLC_SUCCESS;
 315
 316         case DEMUX_SET_NEXT_DEMUX_TIME:
 317             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 318             return VLC_SUCCESS;
 319
 320         case DEMUX_GET_FPS:
 321         case DEMUX_GET_META:
 322         case DEMUX_GET_TITLE_INFO:
 323             return VLC_EGENERIC;
 324
 325         default:
 326             msg_Err( p_demux, "unknown query in subtitle control" );
 327             return VLC_EGENERIC;
 328     }
 329 }
 330
 331 /*****************************************************************************
 332  * Demux: Send subtitle to decoder
 333  *****************************************************************************/
 334 static int Demux( demux_t *p_demux )
 335 {
 336     demux_sys_t *p_sys = p_demux->p_sys;
 337     int64_t i_maxdate;
 338     int i;
 339
 340     for( i = 0; i < p_sys->i_tracks; i++ )
 341     {
 342 #define tk p_sys->track[i]
 343         if( tk.i_current_subtitle >= tk.i_subtitles )
 344             continue;
 345
 346         i_maxdate = (int64_t) p_sys->i_next_demux_date;
 347         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 348         {
 349             /* Should not happen */
 350             i_maxdate = (int64_t) tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 351         }
 352
 353         while( tk.i_current_subtitle < tk.i_subtitles &&
 354                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 355         {
 356             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 357             block_t *p_block;
 358             int i_size = 0;
 359
 360             /* first compute SPU size */
 361             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 362             {
 363                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 364             }
 365             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 366
 367             /* Seek at the right place */
 368             if( stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 369             {
 370                 msg_Warn( p_demux,
 371                           "cannot seek in the VobSub to the correct time %d", i_pos );
 372                 tk.i_current_subtitle++;
 373                 continue;
 374             }
 375
 376             /* allocate a packet */
 377             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 378             {
 379                 tk.i_current_subtitle++;
 380                 continue;
 381             }
 382
 383             /* read data */
 384             p_block->i_buffer = stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 385             if( p_block->i_buffer <= 6 )
 386             {
 387                 block_Release( p_block );
 388                 tk.i_current_subtitle++;
 389                 continue;
 390             }
 391
 392             /* pts */
 393             p_block->i_pts = tk.p_subtitles[tk.i_current_subtitle].i_start;
 394
 395             /* demux this block */
 396             DemuxVobSub( p_demux, p_block );
 397
 398             tk.i_current_subtitle++;
 399         }
 400 #undef tk
 401     }
 402
 403     /* */
 404     p_sys->i_next_demux_date = 0;
 405
 406     return 1;
 407 }
 408
 409 static int TextLoad( text_t *txt, stream_t *s )
 410 {
 411     int   i_line_max;
 412
 413     /* init txt */
 414     i_line_max          = 500;
 415     txt->i_line_count   = 0;
 416     txt->i_line         = 0;
 417     txt->line           = calloc( i_line_max, sizeof( char * ) );
 418
 419     /* load the complete file */
 420     for( ;; )
 421     {
 422         char *psz = stream_ReadLine( s );
 423
 424         if( psz == NULL )
 425             break;
 426
 427         txt->line[txt->i_line_count++] = psz;
 428         if( txt->i_line_count >= i_line_max )
 429         {
 430             i_line_max += 100;
 431             txt->line = realloc( txt->line, i_line_max * sizeof( char*) );
 432         }
 433     }
 434
 435     if( txt->i_line_count <= 0 )
 436     {
 437         free( txt->line );
 438         return VLC_EGENERIC;
 439     }
 440
 441     return VLC_SUCCESS;
 442 }
 443 static void TextUnload( text_t *txt )
 444 {
 445     int i;
 446
 447     for( i = 0; i < txt->i_line_count; i++ )
 448         free( txt->line[i] );
 449
 450     free( txt->line );
 451     txt->i_line       = 0;
 452     txt->i_line_count = 0;
 453 }
 454
 455 static char *TextGetLine( text_t *txt )
 456 {
 457     if( txt->i_line >= txt->i_line_count )
 458         return( NULL );
 459
 460     return txt->line[txt->i_line++];
 461 }
 462
 463 static int ParseVobSubIDX( demux_t *p_demux )
 464 {
 465     demux_sys_t *p_sys = p_demux->p_sys;
 466     text_t      *txt = &p_sys->txt;
 467     char        *line;
 468     vobsub_track_t *current_tk;
 469
 470     for( ;; )
 471     {
 472         if( ( line = TextGetLine( txt ) ) == NULL )
 473         {
 474             return( VLC_EGENERIC );
 475         }
 476
 477         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 478             continue;
 479         else if( !strncmp( "size:", line, 5 ) )
 480         {
 481             /* Store the original size of the video */
 482             if( sscanf( line, "size: %dx%d",
 483                         &p_sys->i_original_frame_width, &p_sys->i_original_frame_height ) == 2 )
 484             {
 485                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 486             }
 487             else
 488             {
 489                 msg_Warn( p_demux, "reading original frame size failed" );
 490             }
 491         }
 492         else if( !strncmp( "palette:", line, 8 ) )
 493         {
 494             int i;
 495
 496             /* Store the palette of the subs */
 497             if( sscanf( line, "palette: %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x",
 498                         &p_sys->palette[0], &p_sys->palette[1], &p_sys->palette[2], &p_sys->palette[3],
 499                         &p_sys->palette[4], &p_sys->palette[5], &p_sys->palette[6], &p_sys->palette[7],
 500                         &p_sys->palette[8], &p_sys->palette[9], &p_sys->palette[10], &p_sys->palette[11],
 501                         &p_sys->palette[12], &p_sys->palette[13], &p_sys->palette[14], &p_sys->palette[15] ) == 16 )
 502             {
 503                 for( i = 0; i < 16; i++ )
 504                 {
 505                     uint8_t r = 0, g = 0, b = 0;
 506                     uint8_t y = 0, u = 0, v = 0;
 507                     r = (p_sys->palette[i] >> 16) & 0xff;
 508                     g = (p_sys->palette[i] >> 8) & 0xff;
 509                     b = (p_sys->palette[i] >> 0) & 0xff;
 510                     /* msg_Dbg( p_demux, "palette %d: R=%x, G=%x, B=%x", i, r, g, b ); */
 511                     y = (uint8_t) __MIN(abs(r * 2104 + g * 4130 + b * 802 + 4096 + 131072) >> 13, 235);
 512                     u = (uint8_t) __MIN(abs(r * -1214 + g * -2384 + b * 3598 + 4096 + 1048576) >> 13, 240);
 513                     v = (uint8_t) __MIN(abs(r * 3598 + g * -3013 + b * -585 + 4096 + 1048576) >> 13, 240);
 514                     p_sys->palette[i] = 0;
 515                     p_sys->palette[i] |= (y&0xff)<<16;
 516                     p_sys->palette[i] |= (u&0xff);
 517                     p_sys->palette[i] |= (v&0xff)<<8;
 518                     /* msg_Dbg( p_demux, "palette %d: y=%x, u=%x, v=%x", i, y, u, v ); */
 519
 520                 }
 521                 p_sys->b_palette = true;
 522                 msg_Dbg( p_demux, "vobsub palette read" );
 523             }
 524             else
 525             {
 526                 msg_Warn( p_demux, "reading original palette failed" );
 527             }
 528         }
 529         else if( !strncmp( "id:", line, 3 ) )
 530         {
 531             char language[20];
 532             int i_track_id;
 533             es_format_t fmt;
 534
 535             /* Lets start a new track */
 536             if( sscanf( line, "id: %2s, index: %d",
 537                         language, &i_track_id ) == 2 )
 538             {
 539                 p_sys->i_tracks++;
 540                 p_sys->track = (vobsub_track_t*)realloc( p_sys->track, sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 541
 542                 /* Init the track */
 543                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
 544                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
 545                 current_tk->i_current_subtitle = 0;
 546                 current_tk->i_subtitles = 0;
 547                 current_tk->p_subtitles = (subtitle_t*)malloc( sizeof( subtitle_t ) );;
 548                 current_tk->i_track_id = i_track_id;
 549                 current_tk->i_delay = (int64_t)0;
 550
 551                 es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
 552                 fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 553                 fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 554                 fmt.psz_language = strdup( language );
 555                 if( p_sys->b_palette )
 556                 {
 557                     fmt.subs.spu.palette[0] = 0xBeef;
 558                     memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 559                 }
 560
 561                 current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 562                 msg_Dbg( p_demux, "new vobsub track detected" );
 563             }
 564             else
 565             {
 566                 msg_Warn( p_demux, "reading new track failed" );
 567             }
 568         }
 569         else if( !strncmp( line, "timestamp:", 10 ) )
 570         {
 571             /*
 572              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 573              * loc is the hex location of the spu in the .sub file
 574              */
 575             int h, m, s, ms, count, loc = 0;
 576             int i_sign = 1;
 577             int64_t i_start, i_location = 0;
 578
 579             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 580
 581             if( sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 582                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 583             {
 584                 subtitle_t *current_sub;
 585
 586                 if( line[count-3] == '-' )
 587                 {
 588                     i_sign = -1;
 589                     h = -h;
 590                 }
 591                 i_start = (int64_t) ( h * 3600*1000 +
 592                             m * 60*1000 +
 593                             s * 1000 +
 594                             ms ) * 1000;
 595                 i_location = loc;
 596
 597                 current_tk->i_subtitles++;
 598                 current_tk->p_subtitles = (subtitle_t*)realloc( current_tk->p_subtitles, 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 = (int64_t) i_start * i_sign;
 602                 current_sub->i_start += current_tk->i_delay;
 603                 current_sub->i_vobsub_location = i_location;
 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             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 616
 617             if( sscanf( line, "%*celay: %d%n:%d:%d:%d",
 618                         &h, &count, &m, &s, &ms ) >= 4 )
 619             {
 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: %+lld global delay: %+lld",
 632                          i_sign, (long long)i_gap,
 633                          (long long)current_tk->i_delay  );
 634             }
 635         }
 636     }
 637     return( 0 );
 638 }
 639
 640 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 641 {
 642     demux_sys_t *p_sys = p_demux->p_sys;
 643     uint8_t     *p = p_bk->p_buffer;
 644     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 645     int i;
 646
 647     while( p < p_end )
 648     {
 649         int i_size = ps_pkt_size( p, p_end - p );
 650         block_t *p_pkt;
 651         int      i_id;
 652         int      i_spu;
 653
 654         if( i_size <= 0 )
 655         {
 656             break;
 657         }
 658         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 659         {
 660             msg_Warn( p_demux, "invalid PES" );
 661             break;
 662         }
 663
 664         if( p[3] != 0xbd )
 665         {
 666             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 667             p += i_size;
 668             continue;
 669         }
 670
 671         /* Create a block */
 672         p_pkt = block_New( p_demux, i_size );
 673         memcpy( p_pkt->p_buffer, p, i_size);
 674         p += i_size;
 675
 676         i_id = ps_pkt_id( p_pkt );
 677         if( (i_id&0xffe0) != 0xbd20 ||
 678             ps_pkt_parse_pes( p_pkt, 1 ) )
 679         {
 680             block_Release( p_pkt );
 681             continue;
 682         }
 683         i_spu = i_id&0x1f;
 684         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 685
 686         for( i = 0; i < p_sys->i_tracks; i++ )
 687         {
 688 #define tk p_sys->track[i]
 689             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 690             p_pkt->i_length = 0;
 691
 692             if( tk.p_es && tk.i_track_id == i_spu )
 693             {
 694                 es_out_Send( p_demux->out, tk.p_es, p_pkt );
 695                 p_bk->i_pts = 0;     /*only first packet has a pts */
 696                 break;
 697             }
 698             else if( i == p_sys->i_tracks - 1 )
 699             {
 700                 block_Release( p_pkt );
 701             }
 702 #undef tk
 703         }
 704     }
 705
 706     return VLC_SUCCESS;
 707 }