modules/demux/ps.h

   1 /*****************************************************************************
   2  * ps.h: Program Stream demuxer helper
   3  *****************************************************************************
   4  * Copyright (C) 2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #include <vlc_demux.h>
  25
  26 /* 256-0xC0 for normal stream, 256 for 0xbd stream, 256 for 0xfd stream */
  27 #define PS_TK_COUNT (768 - 0xc0)
  28 #define PS_ID_TO_TK( id ) ((id) <= 0xff ? (id) - 0xc0 : \
  29             ((id)&0xff) + (((id)&0xff00) == 0xbd00 ? 256-0xC0 : 512-0xc0) )
  30
  31 typedef struct ps_psm_t ps_psm_t;
  32 static inline int ps_id_to_type( const ps_psm_t *, int );
  33 static inline const uint8_t *ps_id_to_lang( const ps_psm_t *, int );
  34
  35 typedef struct
  36 {
  37     vlc_bool_t  b_seen;
  38     int         i_skip;
  39     int         i_id;
  40     es_out_id_t *es;
  41     es_format_t fmt;
  42     mtime_t     i_first_pts;
  43     mtime_t     i_last_pts;
  44
  45 } ps_track_t;
  46
  47 /* Init a set of track */
  48 static inline void ps_track_init( ps_track_t tk[PS_TK_COUNT] )
  49 {
  50     int i;
  51     for( i = 0; i < PS_TK_COUNT; i++ )
  52     {
  53         tk[i].b_seen = VLC_FALSE;
  54         tk[i].i_skip = 0;
  55         tk[i].i_id   = 0;
  56         tk[i].es     = NULL;
  57         tk[i].i_first_pts = -1;
  58         tk[i].i_last_pts = -1;
  59         es_format_Init( &tk[i].fmt, UNKNOWN_ES, 0 );
  60     }
  61 }
  62
  63 /* From id fill i_skip and es_format_t */
  64 static inline int ps_track_fill( ps_track_t *tk, ps_psm_t *p_psm, int i_id )
  65 {
  66     tk->i_skip = 0;
  67     tk->i_id = i_id;
  68     if( ( i_id&0xff00 ) == 0xbd00 )
  69     {
  70         if( ( i_id&0xf8 ) == 0x88 || (i_id&0xf8) == 0x98 )
  71         {
  72             es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('d','t','s',' ') );
  73             tk->i_skip = 4;
  74         }
  75         else if( ( i_id&0xf0 ) == 0x80
  76                ||  (i_id&0xf0) == 0xc0 ) /* AC-3, Can also be used for DD+/E-AC-3 */
  77         {
  78             es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('a','5','2',' ') );
  79             tk->i_skip = 4;
  80         }
  81         else if( (i_id&0xf0) == 0xb0 )
  82         {
  83             es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','l','p',' ') );
  84             /* FIXME / untested ... no known decoder (at least not in VLC/ffmpeg) */
  85         }
  86         else if( ( i_id&0xe0 ) == 0x20 )
  87         {
  88             es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('s','p','u',' ') );
  89             tk->i_skip = 1;
  90         }
  91         else if( ( i_id&0xf0 ) == 0xa0 )
  92         {
  93             es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('l','p','c','m') );
  94             tk->i_skip = 1;
  95         }
  96         else if( ( i_id&0xff ) == 0x70 )
  97         {
  98             es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('o','g','t',' ') );
  99         }
 100         else if( ( i_id&0xfc ) == 0x00 )
 101         {
 102             es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('c','v','d',' ') );
 103         }
 104         else
 105         {
 106             es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
 107             return VLC_EGENERIC;
 108         }
 109     }
 110     else if( (i_id&0xff00) == 0xfd00 )
 111     {
 112         uint8_t i_sub_id = i_id & 0xff;
 113         if( i_sub_id >= 0x55 && i_sub_id <= 0x5f )
 114         {
 115             es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('W','V','C','1') );
 116         }
 117         else
 118         {
 119             es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
 120             return VLC_EGENERIC;
 121         }
 122     }
 123     else
 124     {
 125         int i_type = ps_id_to_type( p_psm , i_id );
 126
 127         es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
 128
 129         if( (i_id&0xf0) == 0xe0 && i_type == 0x1b )
 130         {
 131             es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('h','2','6','4') );
 132         }
 133         else if( (i_id&0xf0) == 0xe0 && i_type == 0x10 )
 134         {
 135             es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','4','v') );
 136         }
 137         else if( (i_id&0xf0) == 0xe0 && i_type == 0x02 )
 138         {
 139             es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
 140         }
 141         else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x0f )
 142         {
 143             es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','4','a') );
 144         }
 145         else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x03 )
 146         {
 147             es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
 148         }
 149
 150         if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xf0 ) == 0xe0 )
 151         {
 152             es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
 153         }
 154         else if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xe0 ) == 0xc0 )
 155         {
 156             es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
 157         }
 158         else if( tk->fmt.i_cat == UNKNOWN_ES ) return VLC_EGENERIC;
 159     }
 160
 161     /* PES packets usually contain truncated frames */
 162     tk->fmt.b_packetized = VLC_FALSE;
 163
 164     if( ps_id_to_lang( p_psm , i_id ) )
 165     {
 166         tk->fmt.psz_language = malloc( 4 );
 167         memcpy( tk->fmt.psz_language, ps_id_to_lang( p_psm , i_id ), 3 );
 168         tk->fmt.psz_language[3] = 0;
 169     }
 170
 171     return VLC_SUCCESS;
 172 }
 173
 174 /* return the id of a PES (should be valid) */
 175 static inline int ps_pkt_id( block_t *p_pkt )
 176 {
 177     if( p_pkt->p_buffer[3] == 0xbd &&
 178         p_pkt->i_buffer >= 9 &&
 179         p_pkt->i_buffer >= 9 + p_pkt->p_buffer[8] )
 180     {
 181         /* VOB extension */
 182         return 0xbd00 | p_pkt->p_buffer[9+p_pkt->p_buffer[8]];
 183     }
 184     else if( p_pkt->p_buffer[3] == 0xfd &&
 185              p_pkt->i_buffer >= 9 &&
 186              (p_pkt->p_buffer[6]&0xC0) == 0x80 &&   /* mpeg2 */
 187              (p_pkt->p_buffer[7]&0x01) == 0x01 )    /* extension_flag */
 188     {
 189         /* ISO 13818 amendment 2 and SMPTE RP 227 */
 190         const uint8_t i_flags = p_pkt->p_buffer[7];
 191         int i_skip = 9;
 192
 193
 194         /* Find PES extension */
 195         if( (i_flags & 0x80 ) )
 196         {
 197             i_skip += 5;        /* pts */
 198             if( (i_flags & 0x40) )
 199                 i_skip += 5;    /* dts */
 200         }
 201         if( (i_flags & 0x20 ) )
 202             i_skip += 6;
 203         if( (i_flags & 0x10 ) )
 204             i_skip += 3;
 205         if( (i_flags & 0x08 ) )
 206             i_skip += 1;
 207         if( (i_flags & 0x04 ) )
 208             i_skip += 1;
 209         if( (i_flags & 0x02 ) )
 210             i_skip += 2;
 211
 212         if( i_skip < p_pkt->i_buffer && (p_pkt->p_buffer[i_skip]&0x01) )
 213         {
 214             const uint8_t i_flags2 = p_pkt->p_buffer[i_skip];
 215
 216             /* Find PES extension 2 */
 217             i_skip += 1;
 218             if( i_flags2 & 0x80 )
 219                 i_skip += 16;
 220             if( (i_flags2 & 0x40) && i_skip < p_pkt->i_buffer )
 221                 i_skip += 1 + p_pkt->p_buffer[i_skip];
 222             if( i_flags2 & 0x20 )
 223                 i_skip += 2;
 224             if( i_flags2 & 0x10 )
 225                 i_skip += 2;
 226
 227             if( i_skip + 1 < p_pkt->i_buffer )
 228             {
 229                 const int i_extension_field_length = p_pkt->p_buffer[i_skip]&0x7f;
 230                 if( i_extension_field_length >=1 )
 231                 {
 232                     int i_stream_id_extension_flag = (p_pkt->p_buffer[i_skip+1] >> 7)&0x1;
 233                     if( i_stream_id_extension_flag == 0 )
 234                         return 0xfd00 | (p_pkt->p_buffer[i_skip+1]&0x7f);
 235                 }
 236             }
 237         }
 238     }
 239     return p_pkt->p_buffer[3];
 240 }
 241
 242 /* return the size of the next packet
 243  * XXX you need to give him at least 14 bytes (and it need to start as a
 244  * valid packet) */
 245 static inline int ps_pkt_size( uint8_t *p, int i_peek )
 246 {
 247     if( p[3] == 0xb9 && i_peek >= 4 )
 248     {
 249         return 4;
 250     }
 251     else if( p[3] == 0xba )
 252     {
 253         if( (p[4] >> 6) == 0x01 && i_peek >= 14 )
 254         {
 255             return 14 + (p[13]&0x07);
 256         }
 257         else if( (p[4] >> 4) == 0x02 && i_peek >= 12 )
 258         {
 259             return 12;
 260         }
 261         return -1;
 262     }
 263     else if( i_peek >= 6 )
 264     {
 265         return 6 + ((p[4]<<8) | p[5] );
 266     }
 267     return -1;
 268 }
 269
 270 /* parse a PACK PES */
 271 static inline int ps_pkt_parse_pack( block_t *p_pkt, int64_t *pi_scr,
 272                                      int *pi_mux_rate )
 273 {
 274     uint8_t *p = p_pkt->p_buffer;
 275     if( p_pkt->i_buffer >= 14 && (p[4] >> 6) == 0x01 )
 276     {
 277         *pi_scr =((((int64_t)p[4]&0x38) << 27 )|
 278                   (((int64_t)p[4]&0x03) << 28 )|
 279                    ((int64_t)p[5] << 20 )|
 280                   (((int64_t)p[6]&0xf8) << 12 )|
 281                   (((int64_t)p[6]&0x03) << 13 )|
 282                    ((int64_t)p[7] << 5 )|
 283                    ((int64_t)p[8] >> 3 )) * 100 / 9;
 284
 285         *pi_mux_rate = ( p[10] << 14 )|( p[11] << 6 )|( p[12] >> 2);
 286     }
 287     else if( p_pkt->i_buffer >= 12 && (p[4] >> 4) == 0x02 )
 288     {
 289         *pi_scr =((((int64_t)p[4]&0x0e) << 29 )|
 290                    ((int64_t)p[5] << 22 )|
 291                   (((int64_t)p[6]&0xfe) << 14 )|
 292                    ((int64_t)p[7] <<  7 )|
 293                    ((int64_t)p[8] >> 1 )) * 100 / 9;
 294
 295         *pi_mux_rate = ( ( p[9]&0x7f )<< 15 )|( p[10] << 7 )|( p[11] >> 1);
 296     }
 297     else
 298     {
 299         return VLC_EGENERIC;
 300     }
 301     return VLC_SUCCESS;
 302 }
 303
 304 /* Parse a SYSTEM PES */
 305 static inline int ps_pkt_parse_system( block_t *p_pkt, ps_psm_t *p_psm,
 306                                        ps_track_t tk[PS_TK_COUNT] )
 307 {
 308     uint8_t *p = &p_pkt->p_buffer[6 + 3 + 1 + 1 + 1];
 309
 310     /* System header is not useable if it references private streams (0xBD)
 311      * or 'all audio streams' (0xB8) or 'all video streams' (0xB9) */
 312     while( p < &p_pkt->p_buffer[p_pkt->i_buffer] )
 313     {
 314         int i_id = p[0];
 315
 316         /* fprintf( stderr, "   SYSTEM_START_CODEEE: id=0x%x\n", p[0] ); */
 317         if( p[0] >= 0xBC || p[0] == 0xB8 || p[0] == 0xB9 ) p += 2;
 318         p++;
 319
 320         if( i_id >= 0xc0 )
 321         {
 322             int i_tk = PS_ID_TO_TK( i_id );
 323
 324             if( !tk[i_tk].b_seen )
 325             {
 326                 if( !ps_track_fill( &tk[i_tk], p_psm, i_id ) )
 327                 {
 328                     tk[i_tk].b_seen = VLC_TRUE;
 329                 }
 330             }
 331         }
 332     }
 333     return VLC_SUCCESS;
 334 }
 335
 336 /* Parse a PES (and skip i_skip_extra in the payload) */
 337 static inline int ps_pkt_parse_pes( block_t *p_pes, int i_skip_extra )
 338 {
 339     uint8_t header[30];
 340     int     i_skip  = 0;
 341
 342     memcpy( header, p_pes->p_buffer, __MIN( p_pes->i_buffer, 30 ) );
 343
 344     switch( header[3] )
 345     {
 346         case 0xBC:  /* Program stream map */
 347         case 0xBE:  /* Padding */
 348         case 0xBF:  /* Private stream 2 */
 349         case 0xB0:  /* ECM */
 350         case 0xB1:  /* EMM */
 351         case 0xFF:  /* Program stream directory */
 352         case 0xF2:  /* DSMCC stream */
 353         case 0xF8:  /* ITU-T H.222.1 type E stream */
 354             i_skip = 6;
 355             break;
 356
 357         default:
 358             if( ( header[6]&0xC0 ) == 0x80 )
 359             {
 360                 /* mpeg2 PES */
 361                 i_skip = header[8] + 9;
 362
 363                 if( header[7]&0x80 )    /* has pts */
 364                 {
 365                     p_pes->i_pts = ((mtime_t)(header[ 9]&0x0e ) << 29)|
 366                                     (mtime_t)(header[10] << 22)|
 367                                    ((mtime_t)(header[11]&0xfe) << 14)|
 368                                     (mtime_t)(header[12] << 7)|
 369                                     (mtime_t)(header[13] >> 1);
 370
 371                     if( header[7]&0x40 )    /* has dts */
 372                     {
 373                          p_pes->i_dts = ((mtime_t)(header[14]&0x0e ) << 29)|
 374                                          (mtime_t)(header[15] << 22)|
 375                                         ((mtime_t)(header[16]&0xfe) << 14)|
 376                                          (mtime_t)(header[17] << 7)|
 377                                          (mtime_t)(header[18] >> 1);
 378                     }
 379                 }
 380             }
 381             else
 382             {
 383                 i_skip = 6;
 384                 while( i_skip < 23 && header[i_skip] == 0xff )
 385                 {
 386                     i_skip++;
 387                 }
 388                 if( i_skip == 23 )
 389                 {
 390                     /* msg_Err( p_demux, "too much MPEG-1 stuffing" ); */
 391                     return VLC_EGENERIC;
 392                 }
 393                 if( ( header[i_skip] & 0xC0 ) == 0x40 )
 394                 {
 395                     i_skip += 2;
 396                 }
 397
 398                 if(  header[i_skip]&0x20 )
 399                 {
 400                      p_pes->i_pts = ((mtime_t)(header[i_skip]&0x0e ) << 29)|
 401                                      (mtime_t)(header[i_skip+1] << 22)|
 402                                     ((mtime_t)(header[i_skip+2]&0xfe) << 14)|
 403                                      (mtime_t)(header[i_skip+3] << 7)|
 404                                      (mtime_t)(header[i_skip+4] >> 1);
 405
 406                     if( header[i_skip]&0x10 )    /* has dts */
 407                     {
 408                          p_pes->i_dts = ((mtime_t)(header[i_skip+5]&0x0e ) << 29)|
 409                                          (mtime_t)(header[i_skip+6] << 22)|
 410                                         ((mtime_t)(header[i_skip+7]&0xfe) << 14)|
 411                                          (mtime_t)(header[i_skip+8] << 7)|
 412                                          (mtime_t)(header[i_skip+9] >> 1);
 413                          i_skip += 10;
 414                     }
 415                     else
 416                     {
 417                         i_skip += 5;
 418                     }
 419                 }
 420                 else
 421                 {
 422                     i_skip += 1;
 423                 }
 424             }
 425     }
 426
 427     i_skip += i_skip_extra;
 428
 429     if( p_pes->i_buffer <= i_skip )
 430     {
 431         return VLC_EGENERIC;
 432     }
 433
 434     p_pes->p_buffer += i_skip;
 435     p_pes->i_buffer -= i_skip;
 436
 437     p_pes->i_dts = 100 * p_pes->i_dts / 9;
 438     p_pes->i_pts = 100 * p_pes->i_pts / 9;
 439
 440     return VLC_SUCCESS;
 441 }
 442
 443 /* Program stream map handling */
 444 typedef struct ps_es_t
 445 {
 446     int i_type;
 447     int i_id;
 448
 449     int i_descriptor;
 450     uint8_t *p_descriptor;
 451
 452     /* Language is iso639-2T */
 453     uint8_t lang[3];
 454
 455 } ps_es_t;
 456
 457 struct ps_psm_t
 458 {
 459     int i_version;
 460
 461     int     i_es;
 462     ps_es_t **es;
 463 };
 464
 465 static inline int ps_id_to_type( const ps_psm_t *p_psm, int i_id )
 466 {
 467     int i;
 468     for( i = 0; p_psm && i < p_psm->i_es; i++ )
 469     {
 470         if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->i_type;
 471     }
 472     return 0;
 473 }
 474
 475 static inline const uint8_t *ps_id_to_lang( const ps_psm_t *p_psm, int i_id )
 476 {
 477     int i;
 478     for( i = 0; p_psm && i < p_psm->i_es; i++ )
 479     {
 480         if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->lang;
 481     }
 482     return 0;
 483 }
 484
 485 static inline void ps_psm_init( ps_psm_t *p_psm )
 486 {
 487     p_psm->i_version = 0xFFFF;
 488     p_psm->i_es = 0;
 489     p_psm->es = 0;
 490 }
 491
 492 static inline void ps_psm_destroy( ps_psm_t *p_psm )
 493 {
 494     while( p_psm->i_es-- )
 495     {
 496         if( p_psm->es[p_psm->i_es]->i_descriptor )
 497             free( p_psm->es[p_psm->i_es]->p_descriptor );
 498         free( p_psm->es[p_psm->i_es] );
 499     }
 500     if( p_psm->es ) free( p_psm->es );
 501
 502     p_psm->es = 0;
 503     p_psm->i_es = 0;
 504 }
 505
 506 static inline int ps_psm_fill( ps_psm_t *p_psm, block_t *p_pkt,
 507                                ps_track_t tk[PS_TK_COUNT], es_out_t *out )
 508 {
 509     int i_buffer = p_pkt->i_buffer;
 510     uint8_t *p_buffer = p_pkt->p_buffer;
 511     int i_length, i_version, i_info_length, i_esm_length, i_es_base, i;
 512
 513     if( !p_psm || p_buffer[3] != 0xbc ) return VLC_EGENERIC;
 514
 515     i_length = (uint16_t)(p_buffer[4] << 8) + p_buffer[5] + 6;
 516     if( i_length > i_buffer ) return VLC_EGENERIC;
 517
 518     //i_current_next_indicator = (p_buffer[6] && 0x01);
 519     i_version = (p_buffer[6] && 0xf8);
 520
 521     if( p_psm->i_version == i_version ) return VLC_EGENERIC;
 522
 523     ps_psm_destroy( p_psm );
 524
 525     i_info_length = (uint16_t)(p_buffer[8] << 8) + p_buffer[9];
 526     if( i_info_length + 10 > i_length ) return VLC_EGENERIC;
 527
 528     /* Elementary stream map */
 529     i_esm_length = (uint16_t)(p_buffer[ 10 + i_info_length ] << 8) +
 530         p_buffer[ 11 + i_info_length];
 531     i_es_base = 12 + i_info_length;
 532
 533     while( i_es_base + 4 < i_length )
 534     {
 535         ps_es_t es;
 536         es.lang[0] = es.lang[1] = es.lang[2] = 0;
 537
 538         es.i_type = p_buffer[ i_es_base  ];
 539         es.i_id = p_buffer[ i_es_base + 1 ];
 540         i_info_length = (uint16_t)(p_buffer[ i_es_base + 2 ] << 8) +
 541             p_buffer[ i_es_base + 3 ];
 542
 543         if( i_es_base + 4 + i_info_length > i_length ) break;
 544
 545         /* TODO Add support for VC-1 stream:
 546          *      stream_type=0xea, stream_id=0xfd AND registration
 547          *      descriptor 0x5 with format_identifier == 0x56432D31 (VC-1)
 548          *      (I need a sample that use PSM with VC-1) */
 549
 550         es.p_descriptor = 0;
 551         es.i_descriptor = i_info_length;
 552         if( i_info_length > 0 )
 553         {
 554             int i = 0;
 555
 556             es.p_descriptor = malloc( i_info_length );
 557             memcpy( es.p_descriptor, p_buffer + i_es_base + 4, i_info_length);
 558
 559             while( i <= es.i_descriptor - 2 )
 560             {
 561                 /* Look for the ISO639 language descriptor */
 562                 if( es.p_descriptor[i] != 0x0a )
 563                 {
 564                     i += es.p_descriptor[i+1] + 2;
 565                     continue;
 566                 }
 567
 568                 if( i <= es.i_descriptor - 6 )
 569                 {
 570                     es.lang[0] = es.p_descriptor[i+2];
 571                     es.lang[1] = es.p_descriptor[i+3];
 572                     es.lang[2] = es.p_descriptor[i+4];
 573                 }
 574                 break;
 575             }
 576         }
 577
 578         p_psm->es = realloc( p_psm->es, sizeof(ps_es_t *) * (p_psm->i_es+1) );
 579         p_psm->es[p_psm->i_es] = malloc( sizeof(ps_es_t) );
 580         *p_psm->es[p_psm->i_es++] = es;
 581         i_es_base += 4 + i_info_length;
 582     }
 583
 584     /* TODO: CRC */
 585
 586     p_psm->i_version = i_version;
 587
 588     /* Check/Modify our existing tracks */
 589     for( i = 0; i < PS_TK_COUNT; i++ )
 590     {
 591         ps_track_t tk_tmp;
 592
 593         if( !tk[i].b_seen || !tk[i].es ) continue;
 594
 595         if( ps_track_fill( &tk_tmp, p_psm, tk[i].i_id ) != VLC_SUCCESS )
 596             continue;
 597
 598         if( tk_tmp.fmt.i_codec == tk[i].fmt.i_codec ) continue;
 599
 600         es_out_Del( out, tk[i].es );
 601         tk[i] = tk_tmp;
 602         tk[i].b_seen = VLC_TRUE;
 603         tk[i].es = es_out_Add( out, &tk[i].fmt );
 604     }
 605
 606     return VLC_SUCCESS;
 607 }