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 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <sys/types.h>
  31
  32 #include <vlc/vlc.h>
  33 #include <vlc/input.h>
  34 #include "vlc_video.h"
  35
  36 #include "ps.h"
  37
  38 #define MAX_LINE 8192
  39
  40 /*****************************************************************************
  41  * Module descriptor
  42  *****************************************************************************/
  43 static int  Open ( vlc_object_t *p_this );
  44 static void Close( vlc_object_t *p_this );
  45
  46 vlc_module_begin();
  47     set_description( _("Vobsub subtitles demux") );
  48     set_category( CAT_INPUT );
  49     set_subcategory( SUBCAT_INPUT_DEMUX );
  50     set_capability( "demux2", 1 );
  51
  52     set_callbacks( Open, Close );
  53
  54     add_shortcut( "vobsub" );
  55     add_shortcut( "subtitle" );
  56 vlc_module_end();
  57
  58 /*****************************************************************************
  59  * Prototypes:
  60  *****************************************************************************/
  61
  62 typedef struct
  63 {
  64     int     i_line_count;
  65     int     i_line;
  66     char    **line;
  67 } text_t;
  68 static int  TextLoad( text_t *, stream_t *s );
  69 static void TextUnload( text_t * );
  70
  71 typedef struct
  72 {
  73     int64_t i_start;
  74     int     i_vobsub_location;
  75 } subtitle_t;
  76
  77 typedef struct
  78 {
  79     es_format_t fmt;
  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     FILE        *p_vobsub_file;
  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     vlc_bool_t  b_palette;
 105     uint32_t    palette[16];
 106 };
 107
 108 static int Demux( demux_t * );
 109 static int Control( demux_t *, int, va_list );
 110
 111 static int ParseVobSubIDX( demux_t * );
 112 static int DemuxVobSub( demux_t *, block_t *);
 113
 114 /*****************************************************************************
 115  * Module initializer
 116  *****************************************************************************/
 117 static int Open ( vlc_object_t *p_this )
 118 {
 119     demux_t     *p_demux = (demux_t*)p_this;
 120     demux_sys_t *p_sys;
 121     char *psz_vobname, *s;
 122     int i_len;
 123
 124     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 125     {
 126         if( !strcasestr( s, "# VobSub index file" ) )
 127         {
 128             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 129             free( s );
 130             if( stream_Seek( p_demux->s, 0 ) )
 131             {
 132                 msg_Warn( p_demux, "failed to rewind" );
 133             }
 134             return VLC_EGENERIC;
 135         }
 136         free( s );
 137
 138     }
 139     else
 140     {
 141         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 142         return VLC_EGENERIC;
 143     }
 144
 145     p_demux->pf_demux = Demux;
 146     p_demux->pf_control = Control;
 147     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 148     p_sys->i_length = 0;
 149     p_sys->p_vobsub_file = NULL;
 150     p_sys->i_tracks = 0;
 151     p_sys->track = (vobsub_track_t *)malloc( sizeof( vobsub_track_t ) );
 152     p_sys->i_original_frame_width = -1;
 153     p_sys->i_original_frame_height = -1;
 154     p_sys->b_palette = VLC_FALSE;
 155     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 156
 157     /* Load the whole file */
 158     TextLoad( &p_sys->txt, p_demux->s );
 159
 160     /* Parse it */
 161     ParseVobSubIDX( p_demux );
 162
 163     /* Unload */
 164     TextUnload( &p_sys->txt );
 165
 166     /* Find the total length of the vobsubs */
 167     if( p_sys->i_tracks > 0 )
 168     {
 169         int i;
 170         for( i = 0; i < p_sys->i_tracks; i++ )
 171         {
 172             if( p_sys->track[i].i_subtitles > 1 )
 173             {
 174                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 175                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 176             }
 177         }
 178     }
 179
 180     psz_vobname = strdup( p_demux->psz_path );
 181     i_len = strlen( psz_vobname );
 182     memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 183
 184     /* open file */
 185     p_sys->p_vobsub_file = utf8_fopen( psz_vobname, "rb" );
 186     free( psz_vobname );
 187     if( p_sys->p_vobsub_file == NULL )
 188     {
 189         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 190                  psz_vobname );
 191         free( p_sys );
 192         return VLC_EGENERIC;
 193     }
 194
 195     return VLC_SUCCESS;
 196 }
 197
 198 /*****************************************************************************
 199  * Close: Close subtitle demux
 200  *****************************************************************************/
 201 static void Close( vlc_object_t *p_this )
 202 {
 203     int i;
 204     demux_t *p_demux = (demux_t*)p_this;
 205     demux_sys_t *p_sys = p_demux->p_sys;
 206
 207     /* Clean all subs from all tracks */
 208     for( i = 0; i < p_sys->i_tracks; i++ )
 209     {
 210         if( p_sys->track[i].p_subtitles ) free( p_sys->track[i].p_subtitles );
 211     }
 212     if( p_sys->track ) free( p_sys->track );
 213
 214     if( p_sys->p_vobsub_file )
 215         fclose( p_sys->p_vobsub_file );
 216
 217     free( p_sys );
 218 }
 219
 220 /*****************************************************************************
 221  * Control:
 222  *****************************************************************************/
 223 static int Control( demux_t *p_demux, int i_query, va_list args )
 224 {
 225     demux_sys_t *p_sys = p_demux->p_sys;
 226     int64_t *pi64, i64;
 227     int i;
 228     double *pf, f;
 229
 230     switch( i_query )
 231     {
 232         case DEMUX_GET_LENGTH:
 233             pi64 = (int64_t*)va_arg( args, int64_t * );
 234             *pi64 = (int64_t) p_sys->i_length;
 235             return VLC_SUCCESS;
 236
 237         case DEMUX_GET_TIME:
 238             pi64 = (int64_t*)va_arg( args, int64_t * );
 239             for( i = 0; i < p_sys->i_tracks; i++ )
 240             {
 241                 vlc_bool_t b_selected;
 242                 /* Check the ES is selected */
 243                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 244                                 p_sys->track[i].p_es, &b_selected );
 245                 if( b_selected ) break;
 246             }
 247             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 248             {
 249                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 250                 return VLC_SUCCESS;
 251             }
 252             return VLC_EGENERIC;
 253
 254         case DEMUX_SET_TIME:
 255             i64 = (int64_t)va_arg( args, int64_t );
 256             for( i = 0; i < p_sys->i_tracks; i++ )
 257             {
 258                 p_sys->track[i].i_current_subtitle = 0;
 259                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 260                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 261                 {
 262                     p_sys->track[i].i_current_subtitle++;
 263                 }
 264
 265                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 266                     return VLC_EGENERIC;
 267             }
 268             return VLC_SUCCESS;
 269
 270         case DEMUX_GET_POSITION:
 271             pf = (double*)va_arg( args, double * );
 272             for( i = 0; i < p_sys->i_tracks; i++ )
 273             {
 274                 vlc_bool_t b_selected;
 275                 /* Check the ES is selected */
 276                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 277                                 p_sys->track[i].p_es, &b_selected );
 278                 if( b_selected ) break;
 279             }
 280             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 281             {
 282                 *pf = 1.0;
 283             }
 284             else if( p_sys->track[i].i_subtitles > 0 )
 285             {
 286                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 287                       (double)p_sys->i_length;
 288             }
 289             else
 290             {
 291                 *pf = 0.0;
 292             }
 293             return VLC_SUCCESS;
 294
 295         case DEMUX_SET_POSITION:
 296             f = (double)va_arg( args, double );
 297             i64 = (int64_t) f * p_sys->i_length;
 298
 299             for( i = 0; i < p_sys->i_tracks; i++ )
 300             {
 301                 p_sys->track[i].i_current_subtitle = 0;
 302                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 303                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 304                 {
 305                     p_sys->track[i].i_current_subtitle++;
 306                 }
 307                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 308                     return VLC_EGENERIC;
 309             }
 310             return VLC_SUCCESS;
 311
 312         case DEMUX_SET_NEXT_DEMUX_TIME:
 313             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 314             return VLC_SUCCESS;
 315
 316         case DEMUX_GET_FPS:
 317         case DEMUX_GET_META:
 318         case DEMUX_GET_TITLE_INFO:
 319             return VLC_EGENERIC;
 320
 321         default:
 322             msg_Err( p_demux, "unknown query in subtitle control" );
 323             return VLC_EGENERIC;
 324     }
 325 }
 326
 327 /*****************************************************************************
 328  * Demux: Send subtitle to decoder
 329  *****************************************************************************/
 330 static int Demux( demux_t *p_demux )
 331 {
 332     demux_sys_t *p_sys = p_demux->p_sys;
 333     int64_t i_maxdate;
 334     int i;
 335
 336     for( i = 0; i < p_sys->i_tracks; i++ )
 337     {
 338 #define tk p_sys->track[i]
 339         if( tk.i_current_subtitle >= tk.i_subtitles )
 340             continue;
 341
 342         i_maxdate = (int64_t) p_sys->i_next_demux_date;
 343         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 344         {
 345             /* Should not happen */
 346             i_maxdate = (int64_t) tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 347         }
 348
 349         while( tk.i_current_subtitle < tk.i_subtitles &&
 350                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 351         {
 352             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 353             block_t *p_block;
 354             int i_size = 0;
 355
 356             /* first compute SPU size */
 357             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 358             {
 359                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 360             }
 361             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 362
 363             /* Seek at the right place */
 364             if( fseek( p_sys->p_vobsub_file, i_pos, SEEK_SET ) )
 365             {
 366                 msg_Warn( p_demux,
 367                           "cannot seek at right vobsub location %d", i_pos );
 368                 tk.i_current_subtitle++;
 369                 continue;
 370             }
 371
 372             /* allocate a packet */
 373             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 374             {
 375                 tk.i_current_subtitle++;
 376                 continue;
 377             }
 378
 379             /* read data */
 380             p_block->i_buffer = fread( p_block->p_buffer, 1, i_size,
 381                                        p_sys->p_vobsub_file );
 382             if( p_block->i_buffer <= 6 )
 383             {
 384                 block_Release( p_block );
 385                 tk.i_current_subtitle++;
 386                 continue;
 387             }
 388
 389             /* pts */
 390             p_block->i_pts = tk.p_subtitles[tk.i_current_subtitle].i_start;
 391
 392             /* demux this block */
 393             DemuxVobSub( p_demux, p_block );
 394
 395             tk.i_current_subtitle++;
 396         }
 397 #undef tk
 398     }
 399
 400     /* */
 401     p_sys->i_next_demux_date = 0;
 402
 403     return 1;
 404 }
 405
 406 static int TextLoad( text_t *txt, stream_t *s )
 407 {
 408     int   i_line_max;
 409
 410     /* init txt */
 411     i_line_max          = 500;
 412     txt->i_line_count   = 0;
 413     txt->i_line         = 0;
 414     txt->line           = calloc( i_line_max, sizeof( char * ) );
 415
 416     /* load the complete file */
 417     for( ;; )
 418     {
 419         char *psz = stream_ReadLine( s );
 420
 421         if( psz == NULL )
 422             break;
 423
 424         txt->line[txt->i_line_count++] = psz;
 425         if( txt->i_line_count >= i_line_max )
 426         {
 427             i_line_max += 100;
 428             txt->line = realloc( txt->line, i_line_max * sizeof( char*) );
 429         }
 430     }
 431
 432     if( txt->i_line_count <= 0 )
 433     {
 434         if( txt->line ) free( txt->line );
 435         return VLC_EGENERIC;
 436     }
 437
 438     return VLC_SUCCESS;
 439 }
 440 static void TextUnload( text_t *txt )
 441 {
 442     int i;
 443
 444     for( i = 0; i < txt->i_line_count; i++ )
 445     {
 446         if( txt->line[i] ) free( txt->line[i] );
 447     }
 448     if( txt->line ) free( txt->line );
 449     txt->i_line       = 0;
 450     txt->i_line_count = 0;
 451 }
 452
 453 static char *TextGetLine( text_t *txt )
 454 {
 455     if( txt->i_line >= txt->i_line_count )
 456         return( NULL );
 457
 458     return txt->line[txt->i_line++];
 459 }
 460
 461 static int ParseVobSubIDX( demux_t *p_demux )
 462 {
 463     demux_sys_t *p_sys = p_demux->p_sys;
 464     text_t      *txt = &p_sys->txt;
 465     char        *line;
 466     vobsub_track_t *current_tk;
 467
 468     for( ;; )
 469     {
 470         if( ( line = TextGetLine( txt ) ) == NULL )
 471         {
 472             return( VLC_EGENERIC );
 473         }
 474
 475         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 476             continue;
 477         else if( !strncmp( "size:", line, 5 ) )
 478         {
 479             /* Store the original size of the video */
 480             if( sscanf( line, "size: %dx%d",
 481                         &p_sys->i_original_frame_width, &p_sys->i_original_frame_height ) == 2 )
 482             {
 483                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 484             }
 485             else
 486             {
 487                 msg_Warn( p_demux, "reading original frame size failed" );
 488             }
 489         }
 490         else if( !strncmp( "palette:", line, 8 ) )
 491         {
 492             int i;
 493
 494             /* Store the palette of the subs */
 495             if( sscanf( line, "palette: %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x",
 496                         &p_sys->palette[0], &p_sys->palette[1], &p_sys->palette[2], &p_sys->palette[3],
 497                         &p_sys->palette[4], &p_sys->palette[5], &p_sys->palette[6], &p_sys->palette[7],
 498                         &p_sys->palette[8], &p_sys->palette[9], &p_sys->palette[10], &p_sys->palette[11],
 499                         &p_sys->palette[12], &p_sys->palette[13], &p_sys->palette[14], &p_sys->palette[15] ) == 16 )
 500             {
 501                 for( i = 0; i < 16; i++ )
 502                 {
 503                     uint8_t r = 0, g = 0, b = 0;
 504                     uint8_t y = 0, u = 0, v = 0;
 505                     r = (p_sys->palette[i] >> 16) & 0xff;
 506                     g = (p_sys->palette[i] >> 8) & 0xff;
 507                     b = (p_sys->palette[i] >> 0) & 0xff;
 508                     /* msg_Dbg( p_demux, "palette %d: R=%x, G=%x, B=%x", i, r, g, b ); */
 509                     y = (uint8_t) __MIN(abs(r * 2104 + g * 4130 + b * 802 + 4096 + 131072) >> 13, 235);
 510                     u = (uint8_t) __MIN(abs(r * -1214 + g * -2384 + b * 3598 + 4096 + 1048576) >> 13, 240);
 511                     v = (uint8_t) __MIN(abs(r * 3598 + g * -3013 + b * -585 + 4096 + 1048576) >> 13, 240);
 512                     p_sys->palette[i] = 0;
 513                     p_sys->palette[i] |= (y&0xff)<<16;
 514                     p_sys->palette[i] |= (u&0xff);
 515                     p_sys->palette[i] |= (v&0xff)<<8;
 516                     /* msg_Dbg( p_demux, "palette %d: y=%x, u=%x, v=%x", i, y, u, v ); */
 517
 518                 }
 519                 p_sys->b_palette = VLC_TRUE;
 520                 msg_Dbg( p_demux, "vobsub palette read" );
 521             }
 522             else
 523             {
 524                 msg_Warn( p_demux, "reading original palette failed" );
 525             }
 526         }
 527         else if( !strncmp( "id:", line, 3 ) )
 528         {
 529             char language[20];
 530             int i_track_id;
 531             es_format_t fmt;
 532
 533             /* Lets start a new track */
 534             if( sscanf( line, "id: %2s, index: %d",
 535                         language, &i_track_id ) == 2 )
 536             {
 537                 p_sys->i_tracks++;
 538                 p_sys->track = (vobsub_track_t*)realloc( p_sys->track, sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 539
 540                 /* Init the track */
 541                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
 542                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
 543                 current_tk->i_current_subtitle = 0;
 544                 current_tk->i_subtitles = 0;
 545                 current_tk->p_subtitles = (subtitle_t*)malloc( sizeof( subtitle_t ) );;
 546                 current_tk->i_track_id = i_track_id;
 547                 current_tk->i_delay = (int64_t)0;
 548
 549                 es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
 550                 fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 551                 fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 552                 fmt.psz_language = strdup( language );
 553                 if( p_sys->b_palette )
 554                 {
 555                     fmt.subs.spu.palette[0] = 0xBeef;
 556                     memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 557                 }
 558
 559                 current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 560                 msg_Dbg( p_demux, "new vobsub track detected" );
 561             }
 562             else
 563             {
 564                 msg_Warn( p_demux, "reading new track failed" );
 565             }
 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             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 578
 579             if( sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 580                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 581             {
 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 = (subtitle_t*)realloc( current_tk->p_subtitles, sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 597                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 598
 599                 current_sub->i_start = (int64_t) i_start * i_sign;
 600                 current_sub->i_start += current_tk->i_delay;
 601                 current_sub->i_vobsub_location = i_location;
 602             }
 603         }
 604         else if( !strncasecmp( line, "delay:", 6 ) )
 605         {
 606             /*
 607              * delay: [sign]hh:mm:ss:mss
 608              */
 609             int h, m, s, ms, count = 0;
 610             int i_sign = 1;
 611             int64_t i_gap = 0;
 612
 613             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 614
 615             if( sscanf( line, "%*celay: %d%n:%d:%d:%d",
 616                         &h, &count, &m, &s, &ms ) >= 4 )
 617             {
 618                 if( line[count-3] == '-' )
 619                 {
 620                     i_sign = -1;
 621                     h = -h;
 622                 }
 623                 i_gap = (int64_t) ( h * 3600*1000 +
 624                             m * 60*1000 +
 625                             s * 1000 +
 626                             ms ) * 1000;
 627
 628                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 629                 msg_Dbg( p_demux, "sign: %+d gap: %+lld global delay: %+lld", i_sign, i_gap, current_tk->i_delay  );
 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 < 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         {
 652             break;
 653         }
 654         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 655         {
 656             msg_Warn( p_demux, "invalid PES" );
 657             break;
 658         }
 659
 660         if( p[3] != 0xbd )
 661         {
 662             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 663             p += i_size;
 664             continue;
 665         }
 666
 667         /* Create a block */
 668         p_pkt = block_New( p_demux, i_size );
 669         memcpy( p_pkt->p_buffer, p, i_size);
 670         p += i_size;
 671
 672         i_id = ps_pkt_id( p_pkt );
 673         if( (i_id&0xffe0) != 0xbd20 ||
 674             ps_pkt_parse_pes( p_pkt, 1 ) )
 675         {
 676             block_Release( p_pkt );
 677             continue;
 678         }
 679         i_spu = i_id&0x1f;
 680         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 681
 682         for( i = 0; i < p_sys->i_tracks; i++ )
 683         {
 684 #define tk p_sys->track[i]
 685             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 686             p_pkt->i_length = 0;
 687
 688             if( tk.p_es && tk.i_track_id == i_spu )
 689             {
 690                 es_out_Send( p_demux->out, tk.p_es, p_pkt );
 691                 p_bk->i_pts = 0;     /*only first packet has a pts */
 692                 break;
 693             }
 694             else if( i == p_sys->i_tracks - 1 )
 695             {
 696                 block_Release( p_pkt );
 697             }
 698 #undef tk
 699         }
 700     }
 701
 702     return VLC_SUCCESS;
 703 }