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     i_len = strlen( p_demux->psz_path );
 181     psz_vobname = strdup( p_demux->psz_path );
 182
 183     strcpy( psz_vobname + i_len - 4, ".sub" );
 184
 185     /* open file */
 186     if( !( p_sys->p_vobsub_file = fopen( psz_vobname, "rb" ) ) )
 187     {
 188         msg_Err( p_demux, "couldn't open .sub Vobsub file: %s",
 189                  psz_vobname );
 190         free( p_sys );
 191         free( psz_vobname );
 192         return VLC_EGENERIC;
 193     }
 194     free( psz_vobname );
 195
 196     return VLC_SUCCESS;
 197 }
 198
 199 /*****************************************************************************
 200  * Close: Close subtitle demux
 201  *****************************************************************************/
 202 static void Close( vlc_object_t *p_this )
 203 {
 204     int i;
 205     demux_t *p_demux = (demux_t*)p_this;
 206     demux_sys_t *p_sys = p_demux->p_sys;
 207
 208     /* Clean all subs from all tracks */
 209     for( i = 0; i < p_sys->i_tracks; i++ )
 210     {
 211         if( p_sys->track[i].p_subtitles ) free( p_sys->track[i].p_subtitles );
 212     }
 213     if( p_sys->track ) free( p_sys->track );
 214
 215     if( p_sys->p_vobsub_file )
 216         fclose( p_sys->p_vobsub_file );
 217
 218     free( p_sys );
 219 }
 220
 221 /*****************************************************************************
 222  * Control:
 223  *****************************************************************************/
 224 static int Control( demux_t *p_demux, int i_query, va_list args )
 225 {
 226     demux_sys_t *p_sys = p_demux->p_sys;
 227     int64_t *pi64, i64;
 228     int i;
 229     double *pf, f;
 230
 231     switch( i_query )
 232     {
 233         case DEMUX_GET_LENGTH:
 234             pi64 = (int64_t*)va_arg( args, int64_t * );
 235             *pi64 = (int64_t) p_sys->i_length;
 236             return VLC_SUCCESS;
 237
 238         case DEMUX_GET_TIME:
 239             pi64 = (int64_t*)va_arg( args, int64_t * );
 240             for( i = 0; i < p_sys->i_tracks; i++ )
 241             {
 242                 vlc_bool_t b_selected;
 243                 /* Check the ES is selected */
 244                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 245                                 p_sys->track[i].p_es, &b_selected );
 246                 if( b_selected ) break;
 247             }
 248             if( i < p_sys->i_tracks && p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles )
 249             {
 250                 *pi64 = p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start;
 251                 return VLC_SUCCESS;
 252             }
 253             return VLC_EGENERIC;
 254
 255         case DEMUX_SET_TIME:
 256             i64 = (int64_t)va_arg( args, int64_t );
 257             for( i = 0; i < p_sys->i_tracks; i++ )
 258             {
 259                 p_sys->track[i].i_current_subtitle = 0;
 260                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 261                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 262                 {
 263                     p_sys->track[i].i_current_subtitle++;
 264                 }
 265
 266                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 267                     return VLC_EGENERIC;
 268             }
 269             return VLC_SUCCESS;
 270
 271         case DEMUX_GET_POSITION:
 272             pf = (double*)va_arg( args, double * );
 273             for( i = 0; i < p_sys->i_tracks; i++ )
 274             {
 275                 vlc_bool_t b_selected;
 276                 /* Check the ES is selected */
 277                 es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 278                                 p_sys->track[i].p_es, &b_selected );
 279                 if( b_selected ) break;
 280             }
 281             if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 282             {
 283                 *pf = 1.0;
 284             }
 285             else if( p_sys->track[i].i_subtitles > 0 )
 286             {
 287                 *pf = (double)p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start /
 288                       (double)p_sys->i_length;
 289             }
 290             else
 291             {
 292                 *pf = 0.0;
 293             }
 294             return VLC_SUCCESS;
 295
 296         case DEMUX_SET_POSITION:
 297             f = (double)va_arg( args, double );
 298             i64 = (int64_t) f * p_sys->i_length;
 299
 300             for( i = 0; i < p_sys->i_tracks; i++ )
 301             {
 302                 p_sys->track[i].i_current_subtitle = 0;
 303                 while( p_sys->track[i].i_current_subtitle < p_sys->track[i].i_subtitles &&
 304                        p_sys->track[i].p_subtitles[p_sys->track[i].i_current_subtitle].i_start < i64 )
 305                 {
 306                     p_sys->track[i].i_current_subtitle++;
 307                 }
 308                 if( p_sys->track[i].i_current_subtitle >= p_sys->track[i].i_subtitles )
 309                     return VLC_EGENERIC;
 310             }
 311             return VLC_SUCCESS;
 312
 313         case DEMUX_SET_NEXT_DEMUX_TIME:
 314             p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
 315             return VLC_SUCCESS;
 316
 317         case DEMUX_GET_FPS:
 318         case DEMUX_GET_META:
 319         case DEMUX_GET_TITLE_INFO:
 320             return VLC_EGENERIC;
 321
 322         default:
 323             msg_Err( p_demux, "unknown query in subtitle control" );
 324             return VLC_EGENERIC;
 325     }
 326 }
 327
 328 /*****************************************************************************
 329  * Demux: Send subtitle to decoder
 330  *****************************************************************************/
 331 static int Demux( demux_t *p_demux )
 332 {
 333     demux_sys_t *p_sys = p_demux->p_sys;
 334     int64_t i_maxdate;
 335     int i;
 336
 337     for( i = 0; i < p_sys->i_tracks; i++ )
 338     {
 339 #define tk p_sys->track[i]
 340         if( tk.i_current_subtitle >= tk.i_subtitles )
 341             continue;
 342
 343         i_maxdate = (int64_t) p_sys->i_next_demux_date;
 344         if( i_maxdate <= 0 && tk.i_current_subtitle < tk.i_subtitles )
 345         {
 346             /* Should not happen */
 347             i_maxdate = (int64_t) tk.p_subtitles[tk.i_current_subtitle].i_start + 1;
 348         }
 349
 350         while( tk.i_current_subtitle < tk.i_subtitles &&
 351                tk.p_subtitles[tk.i_current_subtitle].i_start < i_maxdate )
 352         {
 353             int i_pos = tk.p_subtitles[tk.i_current_subtitle].i_vobsub_location;
 354             block_t *p_block;
 355             int i_size = 0;
 356
 357             /* first compute SPU size */
 358             if( tk.i_current_subtitle + 1 < tk.i_subtitles )
 359             {
 360                 i_size = tk.p_subtitles[tk.i_current_subtitle+1].i_vobsub_location - i_pos;
 361             }
 362             if( i_size <= 0 ) i_size = 65535;   /* Invalid or EOF */
 363
 364             /* Seek at the right place */
 365             if( fseek( p_sys->p_vobsub_file, i_pos, SEEK_SET ) )
 366             {
 367                 msg_Warn( p_demux,
 368                           "cannot seek at right vobsub location %d", i_pos );
 369                 tk.i_current_subtitle++;
 370                 continue;
 371             }
 372
 373             /* allocate a packet */
 374             if( ( p_block = block_New( p_demux, i_size ) ) == NULL )
 375             {
 376                 tk.i_current_subtitle++;
 377                 continue;
 378             }
 379
 380             /* read data */
 381             p_block->i_buffer = fread( p_block->p_buffer, 1, i_size,
 382                                        p_sys->p_vobsub_file );
 383             if( p_block->i_buffer <= 6 )
 384             {
 385                 block_Release( p_block );
 386                 tk.i_current_subtitle++;
 387                 continue;
 388             }
 389
 390             /* pts */
 391             p_block->i_pts = tk.p_subtitles[tk.i_current_subtitle].i_start;
 392
 393             /* demux this block */
 394             DemuxVobSub( p_demux, p_block );
 395
 396             tk.i_current_subtitle++;
 397         }
 398 #undef tk
 399     }
 400
 401     /* */
 402     p_sys->i_next_demux_date = 0;
 403
 404     return 1;
 405 }
 406
 407 static int TextLoad( text_t *txt, stream_t *s )
 408 {
 409     int   i_line_max;
 410
 411     /* init txt */
 412     i_line_max          = 500;
 413     txt->i_line_count   = 0;
 414     txt->i_line         = 0;
 415     txt->line           = calloc( i_line_max, sizeof( char * ) );
 416
 417     /* load the complete file */
 418     for( ;; )
 419     {
 420         char *psz = stream_ReadLine( s );
 421
 422         if( psz == NULL )
 423             break;
 424
 425         txt->line[txt->i_line_count++] = psz;
 426         if( txt->i_line_count >= i_line_max )
 427         {
 428             i_line_max += 100;
 429             txt->line = realloc( txt->line, i_line_max * sizeof( char*) );
 430         }
 431     }
 432
 433     if( txt->i_line_count <= 0 )
 434     {
 435         if( txt->line ) free( txt->line );
 436         return VLC_EGENERIC;
 437     }
 438
 439     return VLC_SUCCESS;
 440 }
 441 static void TextUnload( text_t *txt )
 442 {
 443     int i;
 444
 445     for( i = 0; i < txt->i_line_count; i++ )
 446     {
 447         if( txt->line[i] ) free( txt->line[i] );
 448     }
 449     if( txt->line ) free( txt->line );
 450     txt->i_line       = 0;
 451     txt->i_line_count = 0;
 452 }
 453
 454 static char *TextGetLine( text_t *txt )
 455 {
 456     if( txt->i_line >= txt->i_line_count )
 457         return( NULL );
 458
 459     return txt->line[txt->i_line++];
 460 }
 461
 462 static int ParseVobSubIDX( demux_t *p_demux )
 463 {
 464     demux_sys_t *p_sys = p_demux->p_sys;
 465     text_t      *txt = &p_sys->txt;
 466     char        *line;
 467     vobsub_track_t *current_tk;
 468
 469     for( ;; )
 470     {
 471         if( ( line = TextGetLine( txt ) ) == NULL )
 472         {
 473             return( VLC_EGENERIC );
 474         }
 475
 476         if( *line == 0 || *line == '\r' || *line == '\n' || *line == '#' )
 477             continue;
 478         else if( !strncmp( "size:", line, 5 ) )
 479         {
 480             /* Store the original size of the video */
 481             if( sscanf( line, "size: %dx%d",
 482                         &p_sys->i_original_frame_width, &p_sys->i_original_frame_height ) == 2 )
 483             {
 484                 msg_Dbg( p_demux, "original frame size: %dx%d", p_sys->i_original_frame_width, p_sys->i_original_frame_height );
 485             }
 486             else
 487             {
 488                 msg_Warn( p_demux, "reading original frame size failed" );
 489             }
 490         }
 491         else if( !strncmp( "palette:", line, 8 ) )
 492         {
 493             int i;
 494
 495             /* Store the palette of the subs */
 496             if( sscanf( line, "palette: %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x, %x",
 497                         &p_sys->palette[0], &p_sys->palette[1], &p_sys->palette[2], &p_sys->palette[3],
 498                         &p_sys->palette[4], &p_sys->palette[5], &p_sys->palette[6], &p_sys->palette[7],
 499                         &p_sys->palette[8], &p_sys->palette[9], &p_sys->palette[10], &p_sys->palette[11],
 500                         &p_sys->palette[12], &p_sys->palette[13], &p_sys->palette[14], &p_sys->palette[15] ) == 16 )
 501             {
 502                 for( i = 0; i < 16; i++ )
 503                 {
 504                     uint8_t r = 0, g = 0, b = 0;
 505                     uint8_t y = 0, u = 0, v = 0;
 506                     r = (p_sys->palette[i] >> 16) & 0xff;
 507                     g = (p_sys->palette[i] >> 8) & 0xff;
 508                     b = (p_sys->palette[i] >> 0) & 0xff;
 509                     /* msg_Dbg( p_demux, "palette %d: R=%x, G=%x, B=%x", i, r, g, b ); */
 510                     y = (uint8_t) __MIN(abs(r * 2104 + g * 4130 + b * 802 + 4096 + 131072) >> 13, 235);
 511                     u = (uint8_t) __MIN(abs(r * -1214 + g * -2384 + b * 3598 + 4096 + 1048576) >> 13, 240);
 512                     v = (uint8_t) __MIN(abs(r * 3598 + g * -3013 + b * -585 + 4096 + 1048576) >> 13, 240);
 513                     p_sys->palette[i] = 0;
 514                     p_sys->palette[i] |= (y&0xff)<<16;
 515                     p_sys->palette[i] |= (u&0xff);
 516                     p_sys->palette[i] |= (v&0xff)<<8;
 517                     /* msg_Dbg( p_demux, "palette %d: y=%x, u=%x, v=%x", i, y, u, v ); */
 518
 519                 }
 520                 p_sys->b_palette = VLC_TRUE;
 521                 msg_Dbg( p_demux, "vobsub palette read" );
 522             }
 523             else
 524             {
 525                 msg_Warn( p_demux, "reading original palette failed" );
 526             }
 527         }
 528         else if( !strncmp( "id:", line, 3 ) )
 529         {
 530             char language[20];
 531             int i_track_id;
 532             es_format_t fmt;
 533
 534             /* Lets start a new track */
 535             if( sscanf( line, "id: %2s, index: %d",
 536                         language, &i_track_id ) == 2 )
 537             {
 538                 p_sys->i_tracks++;
 539                 p_sys->track = (vobsub_track_t*)realloc( p_sys->track, sizeof( vobsub_track_t ) * (p_sys->i_tracks + 1 ) );
 540
 541                 /* Init the track */
 542                 current_tk = &p_sys->track[p_sys->i_tracks - 1];
 543                 memset( current_tk, 0, sizeof( vobsub_track_t ) );
 544                 current_tk->i_current_subtitle = 0;
 545                 current_tk->i_subtitles = 0;
 546                 current_tk->p_subtitles = (subtitle_t*)malloc( sizeof( subtitle_t ) );;
 547                 current_tk->i_track_id = i_track_id;
 548                 current_tk->i_delay = (int64_t)0;
 549
 550                 es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
 551                 fmt.subs.spu.i_original_frame_width = p_sys->i_original_frame_width;
 552                 fmt.subs.spu.i_original_frame_height = p_sys->i_original_frame_height;
 553                 fmt.psz_language = strdup( language );
 554                 if( p_sys->b_palette )
 555                 {
 556                     fmt.subs.spu.palette[0] = 0xBeef;
 557                     memcpy( &fmt.subs.spu.palette[1], p_sys->palette, 16 * sizeof( uint32_t ) );
 558                 }
 559
 560                 current_tk->p_es = es_out_Add( p_demux->out, &fmt );
 561                 msg_Dbg( p_demux, "new vobsub track detected" );
 562             }
 563             else
 564             {
 565                 msg_Warn( p_demux, "reading new track failed" );
 566             }
 567         }
 568         else if( !strncmp( line, "timestamp:", 10 ) )
 569         {
 570             /*
 571              * timestamp: [sign]hh:mm:ss:mss, filepos: loc
 572              * loc is the hex location of the spu in the .sub file
 573              */
 574             int h, m, s, ms, count, loc = 0;
 575             int i_sign = 1;
 576             int64_t i_start, i_location = 0;
 577
 578             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 579
 580             if( sscanf( line, "timestamp: %d%n:%d:%d:%d, filepos: %x",
 581                         &h, &count, &m, &s, &ms, &loc ) >= 5  )
 582             {
 583                 subtitle_t *current_sub;
 584
 585                 if( line[count-3] == '-' )
 586                 {
 587                     i_sign = -1;
 588                     h = -h;
 589                 }
 590                 i_start = (int64_t) ( h * 3600*1000 +
 591                             m * 60*1000 +
 592                             s * 1000 +
 593                             ms ) * 1000;
 594                 i_location = loc;
 595
 596                 current_tk->i_subtitles++;
 597                 current_tk->p_subtitles = (subtitle_t*)realloc( current_tk->p_subtitles, sizeof( subtitle_t ) * (current_tk->i_subtitles + 1 ) );
 598                 current_sub = &current_tk->p_subtitles[current_tk->i_subtitles - 1];
 599
 600                 current_sub->i_start = (int64_t) i_start * i_sign;
 601                 current_sub->i_start += current_tk->i_delay;
 602                 current_sub->i_vobsub_location = i_location;
 603             }
 604         }
 605         else if( !strncmp( line, "delay:", 6 ) )
 606         {
 607             /*
 608              * delay: [sign]hh:mm:ss:mss
 609              */
 610             int h, m, s, ms, count = 0;
 611             int i_sign = 1;
 612             int64_t i_gap = 0;
 613
 614             vobsub_track_t *current_tk = &p_sys->track[p_sys->i_tracks - 1];
 615
 616             if( sscanf( line, "delay: %d%n:%d:%d:%d",
 617                         &h, &count, &m, &s, &ms ) >= 4 )
 618             {
 619                 if( line[count-3] == '-' )
 620                 {
 621                     i_sign = -1;
 622                     h = -h;
 623                 }
 624                 i_gap = (int64_t) ( h * 3600*1000 +
 625                             m * 60*1000 +
 626                             s * 1000 +
 627                             ms ) * 1000;
 628
 629                 current_tk->i_delay = current_tk->i_delay + (i_gap * i_sign);
 630                 msg_Dbg( p_demux, "sign: %+d gap: %+lld global delay: %+lld", i_sign, i_gap, current_tk->i_delay  );
 631             }
 632         }
 633     }
 634     return( 0 );
 635 }
 636
 637 static int DemuxVobSub( demux_t *p_demux, block_t *p_bk )
 638 {
 639     demux_sys_t *p_sys = p_demux->p_sys;
 640     uint8_t     *p = p_bk->p_buffer;
 641     uint8_t     *p_end = &p_bk->p_buffer[p_bk->i_buffer];
 642     int i;
 643
 644     while( p < p_end )
 645     {
 646         int i_size = ps_pkt_size( p, p_end - p );
 647         block_t *p_pkt;
 648         int      i_id;
 649         int      i_spu;
 650
 651         if( i_size <= 0 )
 652         {
 653             break;
 654         }
 655         if( p[0] != 0 || p[1] != 0 || p[2] != 0x01 )
 656         {
 657             msg_Warn( p_demux, "invalid PES" );
 658             break;
 659         }
 660
 661         if( p[3] != 0xbd )
 662         {
 663             /* msg_Dbg( p_demux, "we don't need these ps packets (id=0x1%2.2x)", p[3] ); */
 664             p += i_size;
 665             continue;
 666         }
 667
 668         /* Create a block */
 669         p_pkt = block_New( p_demux, i_size );
 670         memcpy( p_pkt->p_buffer, p, i_size);
 671         p += i_size;
 672
 673         i_id = ps_pkt_id( p_pkt );
 674         if( (i_id&0xffe0) != 0xbd20 ||
 675             ps_pkt_parse_pes( p_pkt, 1 ) )
 676         {
 677             block_Release( p_pkt );
 678             continue;
 679         }
 680         i_spu = i_id&0x1f;
 681         /* msg_Dbg( p_demux, "SPU track %d size %d", i_spu, i_size ); */
 682
 683         for( i = 0; i < p_sys->i_tracks; i++ )
 684         {
 685 #define tk p_sys->track[i]
 686             p_pkt->i_dts = p_pkt->i_pts = p_bk->i_pts;
 687             p_pkt->i_length = 0;
 688
 689             if( tk.p_es && tk.i_track_id == i_spu )
 690             {
 691                 es_out_Send( p_demux->out, tk.p_es, p_pkt );
 692                 p_bk->i_pts = 0;     /*only first packet has a pts */
 693                 break;
 694             }
 695             else if( i == p_sys->i_tracks - 1 )
 696             {
 697                 block_Release( p_pkt );
 698             }
 699 #undef tk
 700         }
 701     }
 702
 703     return VLC_SUCCESS;
 704 }