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 <vlc/vlc.h>
  29
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <sys/types.h>
  34
  35 #include <vlc/input.h>
  36 #include "vlc_video.h"
  37 #include "charset.h"
  38
  39 #include "ps.h"
  40
  41 #define MAX_LINE 8192
  42
  43 /*****************************************************************************
  44  * Module descriptor
  45  *****************************************************************************/
  46 static int  Open ( vlc_object_t *p_this );
  47 static void Close( vlc_object_t *p_this );
  48
  49 vlc_module_begin();
  50     set_description( _("Vobsub subtitles parser") );
  51     set_category( CAT_INPUT );
  52     set_subcategory( SUBCAT_INPUT_DEMUX );
  53     set_capability( "demux2", 1 );
  54
  55     set_callbacks( Open, Close );
  56
  57     add_shortcut( "vobsub" );
  58     add_shortcut( "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 static int  TextLoad( text_t *, stream_t *s );
  72 static void TextUnload( text_t * );
  73
  74 typedef struct
  75 {
  76     int64_t i_start;
  77     int     i_vobsub_location;
  78 } subtitle_t;
  79
  80 typedef struct
  81 {
  82     es_format_t fmt;
  83     es_out_id_t *p_es;
  84     int         i_track_id;
  85
  86     int         i_current_subtitle;
  87     int         i_subtitles;
  88     subtitle_t  *p_subtitles;
  89
  90     int64_t     i_delay;
  91 } vobsub_track_t;
  92
  93 struct demux_sys_t
  94 {
  95     int64_t     i_next_demux_date;
  96     int64_t     i_length;
  97
  98     text_t      txt;
  99     stream_t    *p_vobsub_stream;
 100
 101     /* all tracks */
 102     int            i_tracks;
 103     vobsub_track_t *track;
 104
 105     int         i_original_frame_width;
 106     int         i_original_frame_height;
 107     vlc_bool_t  b_palette;
 108     uint32_t    palette[16];
 109 };
 110
 111 static int Demux( demux_t * );
 112 static int Control( demux_t *, int, va_list );
 113
 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
 127     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 128     {
 129         if( !strcasestr( s, "# VobSub index file" ) )
 130         {
 131             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 132             free( s );
 133             if( stream_Seek( p_demux->s, 0 ) )
 134             {
 135                 msg_Warn( p_demux, "failed to rewind" );
 136             }
 137             return VLC_EGENERIC;
 138         }
 139         free( s );
 140
 141     }
 142     else
 143     {
 144         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 145         return VLC_EGENERIC;
 146     }
 147
 148     p_demux->pf_demux = Demux;
 149     p_demux->pf_control = Control;
 150     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 151     p_sys->i_length = 0;
 152     p_sys->p_vobsub_stream = NULL;
 153     p_sys->i_tracks = 0;
 154     p_sys->track = (vobsub_track_t *)malloc( sizeof( vobsub_track_t ) );
 155     p_sys->i_original_frame_width = -1;
 156     p_sys->i_original_frame_height = -1;
 157     p_sys->b_palette = VLC_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         int i;
 173         for( i = 0; i < p_sys->i_tracks; i++ )
 174         {
 175             if( p_sys->track[i].i_subtitles > 1 )
 176             {
 177                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 178                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 179             }
 180         }
 181     }
 182
 183     psz_vobname = strdup( p_demux->psz_path );
 184     i_len = strlen( psz_vobname );
 185     memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 186
 187     /* open file */
 188     p_sys->p_vobsub_stream = stream_UrlNew( p_demux, psz_vobname );
 189     if( p_sys->p_vobsub_stream == NULL )
 190     {
 191         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 192                  psz_vobname );
 193         free( psz_vobname );
 194         free( p_sys );
 195         return VLC_EGENERIC;
 196     }
 197     free( psz_vobname );
 198
 199     return VLC_SUCCESS;
 200 }
 201
 202 /*****************************************************************************
 203  * Close: Close subtitle demux
 204  *****************************************************************************/
 205 static void Close( vlc_object_t *p_this )
 206 {
 207     int i;
 208     demux_t *p_demux = (demux_t*)p_this;
 209     demux_sys_t *p_sys = p_demux->p_sys;
 210
 211     /* Clean all subs from all tracks */
 212     for( i = 0; i < p_sys->i_tracks; i++ )
 213     {
 214         if( p_sys->track[i].p_subtitles ) free( p_sys->track[i].p_subtitles );
 215     }
 216     if( p_sys->track ) 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                 vlc_bool_t 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                 vlc_bool_t 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         if( txt->line ) 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     {
 449         if( txt->line[i] ) free( txt->line[i] );
 450     }
 451     if( txt->line ) free( txt->line );
 452     txt->i_line       = 0;
 453     txt->i_line_count = 0;
 454 }
 455
 456 static char *TextGetLine( text_t *txt )
 457 {
 458     if( txt->i_line >= txt->i_line_count )
 459         return( NULL );
 460
 461     return txt->line[txt->i_line++];
 462 }
 463
 464 static int ParseVobSubIDX( demux_t *p_demux )
 465 {
 466     demux_sys_t *p_sys = p_demux->p_sys;
 467     text_t      *txt = &p_sys->txt;
 468     char        *line;
 469     vobsub_track_t *current_tk;
 470
 471     for( ;; )
 472     {
 473         if( ( line = TextGetLine( txt ) ) == NULL )
 474         {
 475             return( VLC_EGENERIC );
 476         }
 477
 478         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 479             continue;
 480         else if( !strncmp( "size:", line, 5 ) )
 481         {
 482             /* Store the original size of the video */
 483             if( sscanf( line, "size: %dx%d",
 484                         &p_sys->i_original_frame_width, &p_sys->i_original_frame_height ) == 2 )
 485             {
 486                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 487             }
 488             else
 489             {
 490                 msg_Warn( p_demux, "reading original frame size failed" );
 491             }
 492         }
 493         else if( !strncmp( "palette:", line, 8 ) )
 494         {
 495             int i;
 496
 497             /* Store the palette of the subs */
 498             if( sscanf( line, "palette: %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x",
 499                         &p_sys->palette[0], &p_sys->palette[1], &p_sys->palette[2], &p_sys->palette[3],
 500                         &p_sys->palette[4], &p_sys->palette[5], &p_sys->palette[6], &p_sys->palette[7],
 501                         &p_sys->palette[8], &p_sys->palette[9], &p_sys->palette[10], &p_sys->palette[11],
 502                         &p_sys->palette[12], &p_sys->palette[13], &p_sys->palette[14], &p_sys->palette[15] ) == 16 )
 503             {
 504                 for( i = 0; i < 16; i++ )
 505                 {
 506                     uint8_t r = 0, g = 0, b = 0;
 507                     uint8_t y = 0, u = 0, v = 0;
 508                     r = (p_sys->palette[i] >> 16) & 0xff;
 509                     g = (p_sys->palette[i] >> 8) & 0xff;
 510                     b = (p_sys->palette[i] >> 0) & 0xff;
 511                     /* msg_Dbg( p_demux, "palette %d: R=%x, G=%x, B=%x", i, r, g, b ); */
 512                     y = (uint8_t) __MIN(abs(r * 2104 + g * 4130 + b * 802 + 4096 + 131072) >> 13, 235);
 513                     u = (uint8_t) __MIN(abs(r * -1214 + g * -2384 + b * 3598 + 4096 + 1048576) >> 13, 240);
 514                     v = (uint8_t) __MIN(abs(r * 3598 + g * -3013 + b * -585 + 4096 + 1048576) >> 13, 240);
 515                     p_sys->palette[i] = 0;
 516                     p_sys->palette[i] |= (y&0xff)<<16;
 517                     p_sys->palette[i] |= (u&0xff);
 518                     p_sys->palette[i] |= (v&0xff)<<8;
 519                     /* msg_Dbg( p_demux, "palette %d: y=%x, u=%x, v=%x", i, y, u, v ); */
 520
 521                 }
 522                 p_sys->b_palette = VLC_TRUE;
 523                 msg_Dbg( p_demux, "vobsub palette read" );
 524             }
 525             else
 526             {
 527                 msg_Warn( p_demux, "reading original palette failed" );
 528             }
 529         }
 530         else if( !strncmp( "id:", line, 3 ) )
 531         {
 532             char language[20];
 533             int i_track_id;
 534             es_format_t fmt;
 535
 536             /* Lets start a new track */
 537             if( sscanf( line, "id: %2s, index: %d",
 538                         language, &i_track_id ) == 2 )
 539             {
 540                 p_sys->i_tracks++;
 541                 p_sys->track = (vobsub_track_t*)realloc( p_sys->track, sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 542
 543                 /* Init the track */
 544                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
 545                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
 546                 current_tk->i_current_subtitle = 0;
 547                 current_tk->i_subtitles = 0;
 548                 current_tk->p_subtitles = (subtitle_t*)malloc( sizeof( subtitle_t ) );;
 549                 current_tk->i_track_id = i_track_id;
 550                 current_tk->i_delay = (int64_t)0;
 551
 552                 es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
 553                 fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 554                 fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 555                 fmt.psz_language = strdup( language );
 556                 if( p_sys->b_palette )
 557                 {
 558                     fmt.subs.spu.palette[0] = 0xBeef;
 559                     memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 560                 }
 561
 562                 current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 563                 msg_Dbg( p_demux, "new vobsub track detected" );
 564             }
 565             else
 566             {
 567                 msg_Warn( p_demux, "reading new track failed" );
 568             }
 569         }
 570         else if( !strncmp( line, "timestamp:", 10 ) )
 571         {
 572             /*
 573              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 574              * loc is the hex location of the spu in the .sub file
 575              */
 576             int h, m, s, ms, count, loc = 0;
 577             int i_sign = 1;
 578             int64_t i_start, i_location = 0;
 579
 580             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 581
 582             if( sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 583                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 584             {
 585                 subtitle_t *current_sub;
 586
 587                 if( line[count-3] == '-' )
 588                 {
 589                     i_sign = -1;
 590                     h = -h;
 591                 }
 592                 i_start = (int64_t) ( h * 3600*1000 +
 593                             m * 60*1000 +
 594                             s * 1000 +
 595                             ms ) * 1000;
 596                 i_location = loc;
 597
 598                 current_tk->i_subtitles++;
 599                 current_tk->p_subtitles = (subtitle_t*)realloc( current_tk->p_subtitles, sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 600                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 601
 602                 current_sub->i_start = (int64_t) i_start * i_sign;
 603                 current_sub->i_start += current_tk->i_delay;
 604                 current_sub->i_vobsub_location = i_location;
 605             }
 606         }
 607         else if( !strncasecmp( line, "delay:", 6 ) )
 608         {
 609             /*
 610              * delay: [sign]hh:mm:ss:mss
 611              */
 612             int h, m, s, ms, count = 0;
 613             int i_sign = 1;
 614             int64_t i_gap = 0;
 615
 616             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 617
 618             if( sscanf( line, "%*celay: %d%n:%d:%d:%d",
 619                         &h, &count, &m, &s, &ms ) >= 4 )
 620             {
 621                 if( line[count-3] == '-' )
 622                 {
 623                     i_sign = -1;
 624                     h = -h;
 625                 }
 626                 i_gap = (int64_t) ( h * 3600*1000 +
 627                             m * 60*1000 +
 628                             s * 1000 +
 629                             ms ) * 1000;
 630
 631                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 632                 msg_Dbg( p_demux, "sign: %+d gap: %+lld global delay: %+lld", i_sign, i_gap, current_tk->i_delay  );
 633             }
 634         }
 635     }
 636     return( 0 );
 637 }
 638
 639 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 640 {
 641     demux_sys_t *p_sys = p_demux->p_sys;
 642     uint8_t     *p = p_bk->p_buffer;
 643     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 644     int i;
 645
 646     while( p < p_end )
 647     {
 648         int i_size = ps_pkt_size( p, p_end - p );
 649         block_t *p_pkt;
 650         int      i_id;
 651         int      i_spu;
 652
 653         if( i_size <= 0 )
 654         {
 655             break;
 656         }
 657         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 658         {
 659             msg_Warn( p_demux, "invalid PES" );
 660             break;
 661         }
 662
 663         if( p[3] != 0xbd )
 664         {
 665             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 666             p += i_size;
 667             continue;
 668         }
 669
 670         /* Create a block */
 671         p_pkt = block_New( p_demux, i_size );
 672         memcpy( p_pkt->p_buffer, p, i_size);
 673         p += i_size;
 674
 675         i_id = ps_pkt_id( p_pkt );
 676         if( (i_id&0xffe0) != 0xbd20 ||
 677             ps_pkt_parse_pes( p_pkt, 1 ) )
 678         {
 679             block_Release( p_pkt );
 680             continue;
 681         }
 682         i_spu = i_id&0x1f;
 683         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 684
 685         for( i = 0; i < p_sys->i_tracks; i++ )
 686         {
 687 #define tk p_sys->track[i]
 688             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 689             p_pkt->i_length = 0;
 690
 691             if( tk.p_es && tk.i_track_id == i_spu )
 692             {
 693                 es_out_Send( p_demux->out, tk.p_es, p_pkt );
 694                 p_bk->i_pts = 0;     /*only first packet has a pts */
 695                 break;
 696             }
 697             else if( i == p_sys->i_tracks - 1 )
 698             {
 699                 block_Release( p_pkt );
 700             }
 701 #undef tk
 702         }
 703     }
 704
 705     return VLC_SUCCESS;
 706 }