modules/demux/ps.h

   1 /*****************************************************************************
   2  * ps.h: Program Stream demuxer helper
   3  *****************************************************************************
   4  * Copyright (C) 2004-2009 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 <assert.h>
  25 #include <vlc_demux.h>
  26 #include <vlc_memory.h>
  27
  28 /* 256-0xC0 for normal stream, 256 for 0xbd stream, 256 for 0xfd stream, 8 for 0xa0 AOB stream */
  29 #define PS_TK_COUNT (256+256+256+8 - 0xc0)
  30 #if 0
  31 #define PS_ID_TO_TK( id ) ((id) <= 0xff ? (id) - 0xc0 : \
  32             ((id)&0xff) + (((id)&0xff00) == 0xbd00 ? 256-0xC0 : 512-0xc0) )
  33 #else
  34 static inline int ps_id_to_tk( unsigned i_id )
  35 {
  36     if( i_id <= 0xff )
  37         return i_id - 0xc0;
  38     else if( (i_id & 0xff00) == 0xbd00 )
  39         return 256-0xC0 + (i_id & 0xff);
  40     else if( (i_id & 0xff00) == 0xfd00 )
  41         return 512-0xc0 + (i_id & 0xff);
  42     else
  43         return 768-0xc0 + (i_id & 0x07);
  44 }
  45 #define PS_ID_TO_TK( id ) ps_id_to_tk( id )
  46 #endif
  47
  48 typedef struct ps_psm_t ps_psm_t;
  49 static inline int ps_id_to_type( const ps_psm_t *, int );
  50 static inline const uint8_t *ps_id_to_lang( const ps_psm_t *, int );
  51
  52 typedef struct
  53 {
  54     bool  b_seen;
  55     int         i_skip;
  56     int         i_id;
  57     es_out_id_t *es;
  58     es_format_t fmt;
  59     mtime_t     i_first_pts;
  60     mtime_t     i_last_pts;
  61
  62 } ps_track_t;
  63
  64 /* Init a set of track */
  65 static inline void ps_track_init( ps_track_t tk[PS_TK_COUNT] )
  66 {
  67     int i;
  68     for( i = 0; i < PS_TK_COUNT; i++ )
  69     {
  70         tk[i].b_seen = false;
  71         tk[i].i_skip = 0;
  72         tk[i].i_id   = 0;
  73         tk[i].es     = NULL;
  74         tk[i].i_first_pts = -1;
  75         tk[i].i_last_pts = -1;
  76         es_format_Init( &tk[i].fmt, UNKNOWN_ES, 0 );
  77     }
  78 }
  79
  80 /* From id fill i_skip and es_format_t */
  81 static inline int ps_track_fill( ps_track_t *tk, ps_psm_t *p_psm, int i_id )
  82 {
  83     tk->i_skip = 0;
  84     tk->i_id = i_id;
  85     if( ( i_id&0xff00 ) == 0xbd00 )
  86     {
  87         if( ( i_id&0xf8 ) == 0x88 || (i_id&0xf8) == 0x98 )
  88         {
  89             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_DTS );
  90             tk->i_skip = 4;
  91         }
  92         else if( ( i_id&0xf0 ) == 0x80
  93                ||  (i_id&0xf0) == 0xc0 ) /* AC-3, Can also be used for DD+/E-AC-3 */
  94         {
  95             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_A52 );
  96             tk->i_skip = 4;
  97         }
  98         else if( (i_id&0xf0) == 0xb0 )
  99         {
 100             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_MLP );
 101             /* FIXME / untested ... no known decoder (at least not in VLC/ffmpeg) */
 102         }
 103         else if( ( i_id&0xe0 ) == 0x20 )
 104         {
 105             es_format_Init( &tk->fmt, SPU_ES, VLC_CODEC_SPU );
 106             tk->i_skip = 1;
 107         }
 108         else if( ( i_id&0xf0 ) == 0xa0 )
 109         {
 110             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_DVD_LPCM );
 111             tk->i_skip = 1;
 112         }
 113         else if( ( i_id&0xff ) == 0x70 )
 114         {
 115             es_format_Init( &tk->fmt, SPU_ES, VLC_CODEC_OGT );
 116         }
 117         else if( ( i_id&0xfc ) == 0x00 )
 118         {
 119             es_format_Init( &tk->fmt, SPU_ES, VLC_CODEC_CVD );
 120         }
 121         else if( ( i_id&0xff ) == 0x10 )
 122         {
 123             es_format_Init( &tk->fmt, SPU_ES, VLC_CODEC_TELETEXT );
 124         }
 125         else
 126         {
 127             es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
 128             return VLC_EGENERIC;
 129         }
 130     }
 131     else if( (i_id&0xff00) == 0xfd00 )
 132     {
 133         uint8_t i_sub_id = i_id & 0xff;
 134         if( i_sub_id >= 0x55 && i_sub_id <= 0x5f )
 135         {
 136             es_format_Init( &tk->fmt, VIDEO_ES, VLC_CODEC_VC1 );
 137         }
 138         else
 139         {
 140             es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
 141             return VLC_EGENERIC;
 142         }
 143     }
 144     else if( (i_id&0xff00) == 0xa000 )
 145     {
 146         uint8_t i_sub_id = i_id & 0x07;
 147         if( i_sub_id == 0 )
 148         {
 149             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_DVDA_LPCM );
 150             tk->i_skip = 1;
 151         }
 152         else if( i_sub_id == 1 )
 153         {
 154             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_MLP );
 155             tk->i_skip = -1; /* It's a hack for variable skip value */
 156         }
 157         else
 158         {
 159             es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
 160             return VLC_EGENERIC;
 161         }
 162     }
 163     else
 164     {
 165         int i_type = ps_id_to_type( p_psm , i_id );
 166
 167         es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
 168
 169         if( (i_id&0xf0) == 0xe0 && i_type == 0x1b )
 170         {
 171             es_format_Init( &tk->fmt, VIDEO_ES, VLC_CODEC_H264 );
 172         }
 173         else if( (i_id&0xf0) == 0xe0 && i_type == 0x10 )
 174         {
 175             es_format_Init( &tk->fmt, VIDEO_ES, VLC_CODEC_MP4V );
 176         }
 177         else if( (i_id&0xf0) == 0xe0 && i_type == 0x02 )
 178         {
 179             es_format_Init( &tk->fmt, VIDEO_ES, VLC_CODEC_MPGV );
 180         }
 181         else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x0f )
 182         {
 183             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_MP4A );
 184         }
 185         else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x11 )
 186         {
 187             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_MP4A );
 188         }
 189         else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x03 )
 190         {
 191             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_MPGA );
 192         }
 193
 194         if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xf0 ) == 0xe0 )
 195         {
 196             es_format_Init( &tk->fmt, VIDEO_ES, VLC_CODEC_MPGV );
 197         }
 198         else if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xe0 ) == 0xc0 )
 199         {
 200             es_format_Init( &tk->fmt, AUDIO_ES, VLC_CODEC_MPGA );
 201         }
 202         else if( tk->fmt.i_cat == UNKNOWN_ES ) return VLC_EGENERIC;
 203     }
 204
 205     /* PES packets usually contain truncated frames */
 206     tk->fmt.b_packetized = false;
 207
 208     if( ps_id_to_lang( p_psm, i_id ) )
 209     {
 210         tk->fmt.psz_language = malloc( 4 );
 211         if( tk->fmt.psz_language )
 212         {
 213             memcpy( tk->fmt.psz_language, ps_id_to_lang( p_psm , i_id ), 3 );
 214             tk->fmt.psz_language[3] = 0;
 215         }
 216     }
 217
 218     return VLC_SUCCESS;
 219 }
 220
 221 /* return the id of a PES (should be valid) */
 222 static inline int ps_pkt_id( block_t *p_pkt )
 223 {
 224     if( p_pkt->p_buffer[3] == 0xbd &&
 225         p_pkt->i_buffer >= 9 &&
 226         p_pkt->i_buffer >= 9 + (size_t)p_pkt->p_buffer[8] )
 227     {
 228         const unsigned i_start = 9 + p_pkt->p_buffer[8];
 229         const uint8_t i_sub_id = p_pkt->p_buffer[i_start];
 230
 231         if( (i_sub_id & 0xfe) == 0xa0 &&
 232             p_pkt->i_buffer >= i_start + 7 &&
 233             ( p_pkt->p_buffer[i_start + 5] >=  0xc0 ||
 234               p_pkt->p_buffer[i_start + 6] != 0x80 ) )
 235         {
 236             /* AOB LPCM/MLP extension
 237              * XXX for MLP I think that the !=0x80 test is not good and
 238              * will fail for some valid files */
 239             return 0xa000 | (i_sub_id & 0x01);
 240         }
 241
 242         /* VOB extension */
 243         return 0xbd00 | i_sub_id;
 244     }
 245     else if( p_pkt->p_buffer[3] == 0xfd &&
 246              p_pkt->i_buffer >= 9 &&
 247              (p_pkt->p_buffer[6]&0xC0) == 0x80 &&   /* mpeg2 */
 248              (p_pkt->p_buffer[7]&0x01) == 0x01 )    /* extension_flag */
 249     {
 250         /* ISO 13818 amendment 2 and SMPTE RP 227 */
 251         const uint8_t i_flags = p_pkt->p_buffer[7];
 252         unsigned int i_skip = 9;
 253
 254         /* Find PES extension */
 255         if( (i_flags & 0x80 ) )
 256         {
 257             i_skip += 5;        /* pts */
 258             if( (i_flags & 0x40) )
 259                 i_skip += 5;    /* dts */
 260         }
 261         if( (i_flags & 0x20 ) )
 262             i_skip += 6;
 263         if( (i_flags & 0x10 ) )
 264             i_skip += 3;
 265         if( (i_flags & 0x08 ) )
 266             i_skip += 1;
 267         if( (i_flags & 0x04 ) )
 268             i_skip += 1;
 269         if( (i_flags & 0x02 ) )
 270             i_skip += 2;
 271
 272         if( i_skip < p_pkt->i_buffer && (p_pkt->p_buffer[i_skip]&0x01) )
 273         {
 274             const uint8_t i_flags2 = p_pkt->p_buffer[i_skip];
 275
 276             /* Find PES extension 2 */
 277             i_skip += 1;
 278             if( i_flags2 & 0x80 )
 279                 i_skip += 16;
 280             if( (i_flags2 & 0x40) && i_skip < p_pkt->i_buffer )
 281                 i_skip += 1 + p_pkt->p_buffer[i_skip];
 282             if( i_flags2 & 0x20 )
 283                 i_skip += 2;
 284             if( i_flags2 & 0x10 )
 285                 i_skip += 2;
 286
 287             if( i_skip + 1 < p_pkt->i_buffer )
 288             {
 289                 const int i_extension_field_length = p_pkt->p_buffer[i_skip]&0x7f;
 290                 if( i_extension_field_length >=1 )
 291                 {
 292                     int i_stream_id_extension_flag = (p_pkt->p_buffer[i_skip+1] >> 7)&0x1;
 293                     if( i_stream_id_extension_flag == 0 )
 294                         return 0xfd00 | (p_pkt->p_buffer[i_skip+1]&0x7f);
 295                 }
 296             }
 297         }
 298     }
 299     return p_pkt->p_buffer[3];
 300 }
 301
 302 /* return the size of the next packet */
 303 static inline int ps_pkt_size( const uint8_t *p, int i_peek )
 304 {
 305     if( unlikely(i_peek < 4) )
 306     {
 307         return -1;
 308     }
 309     else if( p[3] == 0xb9 )
 310     {
 311         return 4;
 312     }
 313     else if( p[3] == 0xba )
 314     {
 315         if( i_peek >= 14 && (p[4] >> 6) == 0x01 )
 316         {
 317             return 14 + (p[13]&0x07);
 318         }
 319         else if( i_peek >= 12 && (p[4] >> 4) == 0x02 )
 320         {
 321             return 12;
 322         }
 323         return -1;
 324     }
 325     else if( i_peek >= 6 )
 326     {
 327         return 6 + ((p[4]<<8) | p[5] );
 328     }
 329     return -1;
 330 }
 331
 332 /* parse a PACK PES */
 333 static inline int ps_pkt_parse_pack( block_t *p_pkt, int64_t *pi_scr,
 334                                      int *pi_mux_rate )
 335 {
 336     uint8_t *p = p_pkt->p_buffer;
 337     if( p_pkt->i_buffer >= 14 && (p[4] >> 6) == 0x01 )
 338     {
 339         *pi_scr =((((int64_t)p[4]&0x38) << 27 )|
 340                   (((int64_t)p[4]&0x03) << 28 )|
 341                    ((int64_t)p[5] << 20 )|
 342                   (((int64_t)p[6]&0xf8) << 12 )|
 343                   (((int64_t)p[6]&0x03) << 13 )|
 344                    ((int64_t)p[7] << 5 )|
 345                    ((int64_t)p[8] >> 3 )) * 100 / 9;
 346
 347         *pi_mux_rate = ( p[10] << 14 )|( p[11] << 6 )|( p[12] >> 2);
 348     }
 349     else if( p_pkt->i_buffer >= 12 && (p[4] >> 4) == 0x02 )
 350     {
 351         *pi_scr =((((int64_t)p[4]&0x0e) << 29 )|
 352                    ((int64_t)p[5] << 22 )|
 353                   (((int64_t)p[6]&0xfe) << 14 )|
 354                    ((int64_t)p[7] <<  7 )|
 355                    ((int64_t)p[8] >> 1 )) * 100 / 9;
 356
 357         *pi_mux_rate = ( ( p[9]&0x7f )<< 15 )|( p[10] << 7 )|( p[11] >> 1);
 358     }
 359     else
 360     {
 361         return VLC_EGENERIC;
 362     }
 363     return VLC_SUCCESS;
 364 }
 365
 366 /* Parse a SYSTEM PES */
 367 static inline int ps_pkt_parse_system( block_t *p_pkt, ps_psm_t *p_psm,
 368                                        ps_track_t tk[PS_TK_COUNT] )
 369 {
 370     uint8_t *p = &p_pkt->p_buffer[6 + 3 + 1 + 1 + 1];
 371
 372     /* System header is not useable if it references private streams (0xBD)
 373      * or 'all audio streams' (0xB8) or 'all video streams' (0xB9) */
 374     while( p < &p_pkt->p_buffer[p_pkt->i_buffer] )
 375     {
 376         int i_id = p[0];
 377
 378         /* fprintf( stderr, "   SYSTEM_START_CODEEE: id=0x%x\n", p[0] ); */
 379         if( p[0] >= 0xBC || p[0] == 0xB8 || p[0] == 0xB9 ) p += 2;
 380         p++;
 381
 382         if( i_id >= 0xc0 )
 383         {
 384             int i_tk = PS_ID_TO_TK( i_id );
 385
 386             if( !tk[i_tk].b_seen )
 387             {
 388                 if( !ps_track_fill( &tk[i_tk], p_psm, i_id ) )
 389                 {
 390                     tk[i_tk].b_seen = true;
 391                 }
 392             }
 393         }
 394     }
 395     return VLC_SUCCESS;
 396 }
 397
 398 /* Parse a PES (and skip i_skip_extra in the payload) */
 399 static inline int ps_pkt_parse_pes( block_t *p_pes, int i_skip_extra )
 400 {
 401     uint8_t header[34];
 402     unsigned int i_skip  = 0;
 403     int64_t i_pts = -1;
 404     int64_t i_dts = -1;
 405
 406     memcpy( header, p_pes->p_buffer, __MIN( p_pes->i_buffer, 34 ) );
 407
 408     switch( header[3] )
 409     {
 410         case 0xBC:  /* Program stream map */
 411         case 0xBE:  /* Padding */
 412         case 0xBF:  /* Private stream 2 */
 413         case 0xB0:  /* ECM */
 414         case 0xB1:  /* EMM */
 415         case 0xFF:  /* Program stream directory */
 416         case 0xF2:  /* DSMCC stream */
 417         case 0xF8:  /* ITU-T H.222.1 type E stream */
 418             i_skip = 6;
 419             break;
 420
 421         default:
 422             if( ( header[6]&0xC0 ) == 0x80 )
 423             {
 424                 /* mpeg2 PES */
 425                 i_skip = header[8] + 9;
 426
 427                 if( header[7]&0x80 )    /* has pts */
 428                 {
 429                     i_pts = ((mtime_t)(header[ 9]&0x0e ) << 29)|
 430                              (mtime_t)(header[10] << 22)|
 431                             ((mtime_t)(header[11]&0xfe) << 14)|
 432                              (mtime_t)(header[12] << 7)|
 433                              (mtime_t)(header[13] >> 1);
 434
 435                     if( header[7]&0x40 )    /* has dts */
 436                     {
 437                          i_dts = ((mtime_t)(header[14]&0x0e ) << 29)|
 438                                   (mtime_t)(header[15] << 22)|
 439                                  ((mtime_t)(header[16]&0xfe) << 14)|
 440                                   (mtime_t)(header[17] << 7)|
 441                                   (mtime_t)(header[18] >> 1);
 442                     }
 443                 }
 444             }
 445             else
 446             {
 447                 i_skip = 6;
 448                 while( i_skip < 23 && header[i_skip] == 0xff )
 449                 {
 450                     i_skip++;
 451                 }
 452                 if( i_skip == 23 )
 453                 {
 454                     /* msg_Err( p_demux, "too much MPEG-1 stuffing" ); */
 455                     return VLC_EGENERIC;
 456                 }
 457                 if( ( header[i_skip] & 0xC0 ) == 0x40 )
 458                 {
 459                     i_skip += 2;
 460                 }
 461
 462                 if(  header[i_skip]&0x20 )
 463                 {
 464                      i_pts = ((mtime_t)(header[i_skip]&0x0e ) << 29)|
 465                               (mtime_t)(header[i_skip+1] << 22)|
 466                              ((mtime_t)(header[i_skip+2]&0xfe) << 14)|
 467                               (mtime_t)(header[i_skip+3] << 7)|
 468                               (mtime_t)(header[i_skip+4] >> 1);
 469
 470                     if( header[i_skip]&0x10 )    /* has dts */
 471                     {
 472                          i_dts = ((mtime_t)(header[i_skip+5]&0x0e ) << 29)|
 473                                   (mtime_t)(header[i_skip+6] << 22)|
 474                                  ((mtime_t)(header[i_skip+7]&0xfe) << 14)|
 475                                   (mtime_t)(header[i_skip+8] << 7)|
 476                                   (mtime_t)(header[i_skip+9] >> 1);
 477                          i_skip += 10;
 478                     }
 479                     else
 480                     {
 481                         i_skip += 5;
 482                     }
 483                 }
 484                 else
 485                 {
 486                     i_skip += 1;
 487                 }
 488             }
 489     }
 490
 491     if( i_skip_extra >= 0 )
 492         i_skip += i_skip_extra;
 493     else if( p_pes->i_buffer > i_skip + 3 &&
 494              ( ps_pkt_id( p_pes ) == 0xa001 || ps_pkt_id( p_pes ) == 0xbda1 ) )
 495         i_skip += 4 + p_pes->p_buffer[i_skip+3];
 496
 497     if( p_pes->i_buffer <= i_skip )
 498     {
 499         return VLC_EGENERIC;
 500     }
 501
 502     p_pes->p_buffer += i_skip;
 503     p_pes->i_buffer -= i_skip;
 504
 505     if( i_dts >= 0 )
 506         p_pes->i_dts = VLC_TS_0 + 100 * i_dts / 9;
 507     if( i_pts >= 0 )
 508         p_pes->i_pts = VLC_TS_0 + 100 * i_pts / 9;
 509
 510     return VLC_SUCCESS;
 511 }
 512
 513 /* Program stream map handling */
 514 typedef struct ps_es_t
 515 {
 516     int i_type;
 517     int i_id;
 518
 519     int i_descriptor;
 520     uint8_t *p_descriptor;
 521
 522     /* Language is iso639-2T */
 523     uint8_t lang[3];
 524
 525 } ps_es_t;
 526
 527 struct ps_psm_t
 528 {
 529     int i_version;
 530
 531     int     i_es;
 532     ps_es_t **es;
 533 };
 534
 535 static inline int ps_id_to_type( const ps_psm_t *p_psm, int i_id )
 536 {
 537     int i;
 538     for( i = 0; p_psm && i < p_psm->i_es; i++ )
 539     {
 540         if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->i_type;
 541     }
 542     return 0;
 543 }
 544
 545 static inline const uint8_t *ps_id_to_lang( const ps_psm_t *p_psm, int i_id )
 546 {
 547     int i;
 548     for( i = 0; p_psm && i < p_psm->i_es; i++ )
 549     {
 550         if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->lang;
 551     }
 552     return 0;
 553 }
 554
 555 static inline void ps_psm_init( ps_psm_t *p_psm )
 556 {
 557     p_psm->i_version = 0xFFFF;
 558     p_psm->i_es = 0;
 559     p_psm->es = 0;
 560 }
 561
 562 static inline void ps_psm_destroy( ps_psm_t *p_psm )
 563 {
 564     while( p_psm->i_es-- )
 565     {
 566         free( p_psm->es[p_psm->i_es]->p_descriptor );
 567         free( p_psm->es[p_psm->i_es] );
 568     }
 569     free( p_psm->es );
 570
 571     p_psm->es = 0;
 572     p_psm->i_es = 0;
 573 }
 574
 575 static inline int ps_psm_fill( ps_psm_t *p_psm, block_t *p_pkt,
 576                                ps_track_t tk[PS_TK_COUNT], es_out_t *out )
 577 {
 578     int i_buffer = p_pkt->i_buffer;
 579     uint8_t *p_buffer = p_pkt->p_buffer;
 580     int i_length, i_version, i_info_length, i_es_base;
 581
 582     if( !p_psm || p_buffer[3] != 0xbc ) return VLC_EGENERIC;
 583
 584     i_length = (uint16_t)(p_buffer[4] << 8) + p_buffer[5] + 6;
 585     if( i_length > i_buffer ) return VLC_EGENERIC;
 586
 587     //i_current_next_indicator = (p_buffer[6] && 0x01);
 588     i_version = (p_buffer[6] && 0xf8);
 589
 590     if( p_psm->i_version == i_version ) return VLC_EGENERIC;
 591
 592     ps_psm_destroy( p_psm );
 593
 594     i_info_length = (uint16_t)(p_buffer[8] << 8) + p_buffer[9];
 595     if( i_info_length + 10 > i_length ) return VLC_EGENERIC;
 596
 597     /* Elementary stream map */
 598     /* int i_esm_length = (uint16_t)(p_buffer[ 10 + i_info_length ] << 8) +
 599         p_buffer[ 11 + i_info_length]; */
 600     i_es_base = 12 + i_info_length;
 601
 602     while( i_es_base + 4 < i_length )
 603     {
 604         ps_es_t **tmp_es;
 605         ps_es_t es;
 606         es.lang[0] = es.lang[1] = es.lang[2] = 0;
 607
 608         es.i_type = p_buffer[ i_es_base  ];
 609         es.i_id = p_buffer[ i_es_base + 1 ];
 610         i_info_length = (uint16_t)(p_buffer[ i_es_base + 2 ] << 8) +
 611             p_buffer[ i_es_base + 3 ];
 612
 613         if( i_es_base + 4 + i_info_length > i_length ) break;
 614
 615         /* TODO Add support for VC-1 stream:
 616          *      stream_type=0xea, stream_id=0xfd AND registration
 617          *      descriptor 0x5 with format_identifier == 0x56432D31 (VC-1)
 618          *      (I need a sample that use PSM with VC-1) */
 619
 620         es.p_descriptor = 0;
 621         es.i_descriptor = i_info_length;
 622         if( i_info_length > 0 )
 623         {
 624             int i = 0;
 625
 626             es.p_descriptor = malloc( i_info_length );
 627             if( es.p_descriptor )
 628             {
 629                 memcpy( es.p_descriptor, p_buffer + i_es_base + 4, i_info_length);
 630
 631                 while( i <= es.i_descriptor - 2 )
 632                 {
 633                     /* Look for the ISO639 language descriptor */
 634                     if( es.p_descriptor[i] != 0x0a )
 635                     {
 636                         i += es.p_descriptor[i+1] + 2;
 637                         continue;
 638                     }
 639
 640                     if( i <= es.i_descriptor - 6 )
 641                     {
 642                         es.lang[0] = es.p_descriptor[i+2];
 643                         es.lang[1] = es.p_descriptor[i+3];
 644                         es.lang[2] = es.p_descriptor[i+4];
 645                     }
 646                     break;
 647                 }
 648             }
 649         }
 650
 651         tmp_es = realloc_or_free( p_psm->es, sizeof(ps_es_t *) * (p_psm->i_es+1) );
 652         if( tmp_es )
 653         {
 654             p_psm->es = tmp_es;
 655             p_psm->es[p_psm->i_es] = malloc( sizeof(ps_es_t) );
 656             if( p_psm->es[p_psm->i_es] )
 657             {
 658                 *p_psm->es[p_psm->i_es++] = es;
 659                 i_es_base += 4 + i_info_length;
 660             }
 661         }
 662     }
 663
 664     /* TODO: CRC */
 665
 666     p_psm->i_version = i_version;
 667
 668     /* Check/Modify our existing tracks */
 669     for( int i = 0; i < PS_TK_COUNT; i++ )
 670     {
 671         ps_track_t tk_tmp;
 672
 673         if( !tk[i].b_seen || !tk[i].es ) continue;
 674
 675         if( ps_track_fill( &tk_tmp, p_psm, tk[i].i_id ) != VLC_SUCCESS )
 676             continue;
 677
 678         if( tk_tmp.fmt.i_codec == tk[i].fmt.i_codec )
 679         {
 680             es_format_Clean( &tk_tmp.fmt );
 681             continue;
 682         }
 683
 684         es_out_Del( out, tk[i].es );
 685         es_format_Clean( &tk[i].fmt );
 686
 687         tk[i] = tk_tmp;
 688         tk[i].b_seen = true;
 689         tk[i].es = es_out_Add( out, &tk[i].fmt );
 690     }
 691
 692     return VLC_SUCCESS;
 693 }