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_common.h>
  33 #include <vlc_plugin.h>
  34
  35 #include <errno.h>
  36 #include <sys/types.h>
  37
  38 #include <vlc_demux.h>
  39 #include <vlc_charset.h>
  40
  41 #include "ps.h"
  42
  43 #define MAX_LINE 8192
  44
  45 /*****************************************************************************
  46  * Module descriptor
  47  *****************************************************************************/
  48 static int  Open ( vlc_object_t *p_this );
  49 static void Close( vlc_object_t *p_this );
  50
  51 vlc_module_begin();
  52     set_description( N_("Vobsub subtitles parser") );
  53     set_category( CAT_INPUT );
  54     set_subcategory( SUBCAT_INPUT_DEMUX );
  55     set_capability( "demux", 1 );
  56
  57     set_callbacks( Open, Close );
  58
  59     add_shortcut( "vobsub" );
  60     add_shortcut( "subtitle" );
  61 vlc_module_end();
  62
  63 /*****************************************************************************
  64  * Prototypes:
  65  *****************************************************************************/
  66
  67 typedef struct
  68 {
  69     int     i_line_count;
  70     int     i_line;
  71     char    **line;
  72 } text_t;
  73 static int  TextLoad( text_t *, stream_t *s );
  74 static void TextUnload( text_t * );
  75
  76 typedef struct
  77 {
  78     int64_t i_start;
  79     int     i_vobsub_location;
  80 } subtitle_t;
  81
  82 typedef struct
  83 {
  84     es_format_t fmt;
  85     es_out_id_t *p_es;
  86     int         i_track_id;
  87
  88     int         i_current_subtitle;
  89     int         i_subtitles;
  90     subtitle_t  *p_subtitles;
  91
  92     int64_t     i_delay;
  93 } vobsub_track_t;
  94
  95 struct demux_sys_t
  96 {
  97     int64_t     i_next_demux_date;
  98     int64_t     i_length;
  99
 100     text_t      txt;
 101     stream_t    *p_vobsub_stream;
 102
 103     /* all tracks */
 104     int            i_tracks;
 105     vobsub_track_t *track;
 106
 107     int         i_original_frame_width;
 108     int         i_original_frame_height;
 109     bool  b_palette;
 110     uint32_t    palette[16];
 111 };
 112
 113 static int Demux( demux_t * );
 114 static int Control( demux_t *, int, va_list );
 115
 116 static int ParseVobSubIDX( demux_t * );
 117 static int DemuxVobSub( demux_t *, block_t *);
 118
 119 /*****************************************************************************
 120  * Module initializer
 121  *****************************************************************************/
 122 static int Open ( vlc_object_t *p_this )
 123 {
 124     demux_t     *p_demux = (demux_t*)p_this;
 125     demux_sys_t *p_sys;
 126     char *psz_vobname, *s;
 127     int i_len;
 128
 129     if( ( s = stream_ReadLine( p_demux->s ) ) != NULL )
 130     {
 131         if( !strcasestr( s, "# VobSub index file" ) )
 132         {
 133             msg_Dbg( p_demux, "this doesn't seem to be a vobsub file" );
 134             free( s );
 135             if( stream_Seek( p_demux->s, 0 ) )
 136             {
 137                 msg_Warn( p_demux, "failed to rewind" );
 138             }
 139             return VLC_EGENERIC;
 140         }
 141         free( s );
 142
 143     }
 144     else
 145     {
 146         msg_Dbg( p_demux, "could not read vobsub IDX file" );
 147         return VLC_EGENERIC;
 148     }
 149
 150     p_demux->pf_demux = Demux;
 151     p_demux->pf_control = Control;
 152     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 153     p_sys->i_length = 0;
 154     p_sys->p_vobsub_stream = NULL;
 155     p_sys->i_tracks = 0;
 156     p_sys->track = (vobsub_track_t *)malloc( sizeof( vobsub_track_t ) );
 157     p_sys->i_original_frame_width = -1;
 158     p_sys->i_original_frame_height = -1;
 159     p_sys->b_palette = false;
 160     memset( p_sys->palette, 0, 16 * sizeof( uint32_t ) );
 161
 162     /* Load the whole file */
 163     TextLoad( &p_sys->txt, p_demux->s );
 164
 165     /* Parse it */
 166     ParseVobSubIDX( p_demux );
 167
 168     /* Unload */
 169     TextUnload( &p_sys->txt );
 170
 171     /* Find the total length of the vobsubs */
 172     if( p_sys->i_tracks > 0 )
 173     {
 174         int i;
 175         for( i = 0; i < p_sys->i_tracks; i++ )
 176         {
 177             if( p_sys->track[i].i_subtitles > 1 )
 178             {
 179                 if( p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start > p_sys->i_length )
 180                     p_sys->i_length = (int64_t) p_sys->track[i].p_subtitles[p_sys->track[i].i_subtitles-1].i_start + ( 1 *1000 *1000 );
 181             }
 182         }
 183     }
 184
 185     asprintf( &psz_vobname, "%s://%s", p_demux->psz_access, p_demux->psz_path );
 186     i_len = strlen( psz_vobname );
 187     if( i_len >= 4 ) memcpy( psz_vobname + i_len - 4, ".sub", 4 );
 188
 189     /* open file */
 190     p_sys->p_vobsub_stream = stream_UrlNew( p_demux, psz_vobname );
 191     if( p_sys->p_vobsub_stream == NULL )
 192     {
 193         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 194                  psz_vobname );
 195         free( psz_vobname );
 196         free( p_sys );
 197         return VLC_EGENERIC;
 198     }
 199     free( psz_vobname );
 200
 201     return VLC_SUCCESS;
 202 }
 203
 204 /*****************************************************************************
 205  * Close: Close subtitle demux
 206  *****************************************************************************/
 207 static void Close( vlc_object_t *p_this )
 208 {
 209     int i;
 210     demux_t *p_demux = (demux_t*)p_this;
 211     demux_sys_t *p_sys = p_demux->p_sys;
 212
 213     /* Clean all subs from all tracks */
 214     for( i = 0; i < p_sys->i_tracks; i++ )
 215         free( p_sys->track[i].p_subtitles );
 216
 217     free( p_sys->track );
 218
 219     if( p_sys->p_vobsub_stream )
 220         stream_Delete( p_sys->p_vobsub_stream );
 221
 222     free( p_sys );
 223 }
 224
 225 /*****************************************************************************
 226  * Control:
 227  *****************************************************************************/
 228 static int Control( demux_t *p_demux, int i_query, va_list args )
 229 {
 230     demux_sys_t *p_sys = p_demux->p_sys;
 231     int64_t *pi64, i64;
 232     int i;
 233     double *pf, f;
 234
 235     switch( i_query )
 236     {
 237         case DEMUX_GET_LENGTH:
 238             pi64 = (int64_t*)va_arg( args, int64_t * );
 239             *pi64 = (int64_t) p_sys->i_length;
 240             return VLC_SUCCESS;
 241
 242         case DEMUX_GET_TIME:
 243             pi64 = (int64_t*)va_arg( args, int64_t * );
 244             for( i = 0; i < p_sys->i_tracks; i++ )
 245             {
 246                 bool b_selected;
 247                 /* Check the ES is selected */
 248                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 249                                 p_sys->track[i].p_es, &b_selected );
 250                 if( b_selected ) break;
 251             }
 252             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 253             {
 254                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 255                 return VLC_SUCCESS;
 256             }
 257             return VLC_EGENERIC;
 258
 259         case DEMUX_SET_TIME:
 260             i64 = (int64_t)va_arg( args, int64_t );
 261             for( i = 0; i < p_sys->i_tracks; i++ )
 262             {
 263                 p_sys->track[i].i_current_subtitle = 0;
 264                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 265                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 266                 {
 267                     p_sys->track[i].i_current_subtitle++;
 268                 }
 269
 270                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 271                     return VLC_EGENERIC;
 272             }
 273             return VLC_SUCCESS;
 274
 275         case DEMUX_GET_POSITION:
 276             pf = (double*)va_arg( args, double * );
 277             for( i = 0; i < p_sys->i_tracks; i++ )
 278             {
 279                 bool b_selected;
 280                 /* Check the ES is selected */
 281                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 282                                 p_sys->track[i].p_es, &b_selected );
 283                 if( b_selected ) break;
 284             }
 285             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 286             {
 287                 *pf = 1.0;
 288             }
 289             else if( p_sys->track[i].i_subtitles > 0 )
 290             {
 291                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 292                       (double)p_sys->i_length;
 293             }
 294             else
 295             {
 296                 *pf = 0.0;
 297             }
 298             return VLC_SUCCESS;
 299
 300         case DEMUX_SET_POSITION:
 301             f = (double)va_arg( args, double );
 302             i64 = (int64_t) f * p_sys->i_length;
 303
 304             for( i = 0; i < p_sys->i_tracks; i++ )
 305             {
 306                 p_sys->track[i].i_current_subtitle = 0;
 307                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 308                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 309                 {
 310                     p_sys->track[i].i_current_subtitle++;
 311                 }
 312                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 313                     return VLC_EGENERIC;
 314             }
 315             return VLC_SUCCESS;
 316
 317         case DEMUX_SET_NEXT_DEMUX_TIME:
 318             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 319             return VLC_SUCCESS;
 320
 321         case DEMUX_GET_FPS:
 322         case DEMUX_GET_META:
 323         case DEMUX_GET_TITLE_INFO:
 324             return VLC_EGENERIC;
 325
 326         default:
 327             msg_Err( p_demux, "unknown query in subtitle control" );
 328             return VLC_EGENERIC;
 329     }
 330 }
 331
 332 /*****************************************************************************
 333  * Demux: Send subtitle to decoder
 334  *****************************************************************************/
 335 static int Demux( demux_t *p_demux )
 336 {
 337     demux_sys_t *p_sys = p_demux->p_sys;
 338     int64_t i_maxdate;
 339     int i;
 340
 341     for( i = 0; i < p_sys->i_tracks; i++ )
 342     {
 343 #define tk p_sys->track[i]
 344         if( tk.i_current_subtitle >= tk.i_subtitles )
 345             continue;
 346
 347         i_maxdate = (int64_t) p_sys->i_next_demux_date;
 348         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 349         {
 350             /* Should not happen */
 351             i_maxdate = (int64_t) tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 352         }
 353
 354         while( tk.i_current_subtitle < tk.i_subtitles &&
 355                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 356         {
 357             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 358             block_t *p_block;
 359             int i_size = 0;
 360
 361             /* first compute SPU size */
 362             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 363             {
 364                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 365             }
 366             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 367
 368             /* Seek at the right place */
 369             if( stream_Seek( p_sys->p_vobsub_stream, i_pos ) )
 370             {
 371                 msg_Warn( p_demux,
 372                           "cannot seek in the VobSub to the correct time %d", i_pos );
 373                 tk.i_current_subtitle++;
 374                 continue;
 375             }
 376
 377             /* allocate a packet */
 378             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 379             {
 380                 tk.i_current_subtitle++;
 381                 continue;
 382             }
 383
 384             /* read data */
 385             p_block->i_buffer = stream_Read( p_sys->p_vobsub_stream, p_block->p_buffer, i_size );
 386             if( p_block->i_buffer <= 6 )
 387             {
 388                 block_Release( p_block );
 389                 tk.i_current_subtitle++;
 390                 continue;
 391             }
 392
 393             /* pts */
 394             p_block->i_pts = tk.p_subtitles[tk.i_current_subtitle].i_start;
 395
 396             /* demux this block */
 397             DemuxVobSub( p_demux, p_block );
 398
 399             tk.i_current_subtitle++;
 400         }
 401 #undef tk
 402     }
 403
 404     /* */
 405     p_sys->i_next_demux_date = 0;
 406
 407     return 1;
 408 }
 409
 410 static int TextLoad( text_t *txt, stream_t *s )
 411 {
 412     int   i_line_max;
 413
 414     /* init txt */
 415     i_line_max          = 500;
 416     txt->i_line_count   = 0;
 417     txt->i_line         = 0;
 418     txt->line           = calloc( i_line_max, sizeof( char * ) );
 419
 420     /* load the complete file */
 421     for( ;; )
 422     {
 423         char *psz = stream_ReadLine( s );
 424
 425         if( psz == NULL )
 426             break;
 427
 428         txt->line[txt->i_line_count++] = psz;
 429         if( txt->i_line_count >= i_line_max )
 430         {
 431             i_line_max += 100;
 432             txt->line = realloc( txt->line, i_line_max * sizeof( char*) );
 433         }
 434     }
 435
 436     if( txt->i_line_count <= 0 )
 437     {
 438         free( txt->line );
 439         return VLC_EGENERIC;
 440     }
 441
 442     return VLC_SUCCESS;
 443 }
 444 static void TextUnload( text_t *txt )
 445 {
 446     int i;
 447
 448     for( i = 0; i < txt->i_line_count; i++ )
 449         free( txt->line[i] );
 450
 451     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 = 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",
 633                          i_sign, (long long)i_gap,
 634                          (long long)current_tk->i_delay  );
 635             }
 636         }
 637     }
 638     return( 0 );
 639 }
 640
 641 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 642 {
 643     demux_sys_t *p_sys = p_demux->p_sys;
 644     uint8_t     *p = p_bk->p_buffer;
 645     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 646     int i;
 647
 648     while( p < p_end )
 649     {
 650         int i_size = ps_pkt_size( p, p_end - p );
 651         block_t *p_pkt;
 652         int      i_id;
 653         int      i_spu;
 654
 655         if( i_size <= 0 )
 656         {
 657             break;
 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_New( p_demux, i_size );
 674         memcpy( p_pkt->p_buffer, p, i_size);
 675         p += i_size;
 676
 677         i_id = ps_pkt_id( p_pkt );
 678         if( (i_id&0xffe0) != 0xbd20 ||
 679             ps_pkt_parse_pes( p_pkt, 1 ) )
 680         {
 681             block_Release( p_pkt );
 682             continue;
 683         }
 684         i_spu = i_id&0x1f;
 685         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 686
 687         for( i = 0; i < p_sys->i_tracks; i++ )
 688         {
 689 #define tk p_sys->track[i]
 690             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 691             p_pkt->i_length = 0;
 692
 693             if( tk.p_es && tk.i_track_id == i_spu )
 694             {
 695                 es_out_Send( p_demux->out, tk.p_es, p_pkt );
 696                 p_bk->i_pts = 0;     /*only first packet has a pts */
 697                 break;
 698             }
 699             else if( i == p_sys->i_tracks - 1 )
 700             {
 701                 block_Release( p_pkt );
 702             }
 703 #undef tk
 704         }
 705     }
 706
 707     return VLC_SUCCESS;
 708 }