git.sesse.net Git - vlc/blob - modules/demux/mp4/mp4.c

   1 /*****************************************************************************
   2  * mp4.c : MP4 file input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001-2004 VideoLAN
   5  * $Id$
   6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26 #include <stdlib.h>                                      /* malloc(), free() */
  27
  28 #include <vlc/vlc.h>
  29 #include <vlc/input.h>
  30 #include <vlc_playlist.h>
  31 #include "iso_lang.h"
  32 #include "vlc_meta.h"
  33
  34 #include "libmp4.h"
  35 #include "mp4.h"
  36 #include "drms.h"
  37
  38 /*****************************************************************************
  39  * Module descriptor
  40  *****************************************************************************/
  41 static int  Open ( vlc_object_t * );
  42 static void Close( vlc_object_t * );
  43
  44 vlc_module_begin();
  45     set_description( _("MP4 stream demuxer") );
  46     set_capability( "demux", 242 );
  47     set_callbacks( Open, Close );
  48 vlc_module_end();
  49
  50 /* TODO:
  51  *  - DEMUX_GET_META and meta parsing
  52  */
  53
  54 /*****************************************************************************
  55  * Local prototypes
  56  *****************************************************************************/
  57 static int    Demux   ( input_thread_t * );
  58 static int    DemuxRef( input_thread_t *p_input )
  59 {
  60     return 0;
  61 }
  62 static int   Seek     ( input_thread_t *, mtime_t );
  63 static int   Control  ( input_thread_t *, int, va_list );
  64
  65 /*****************************************************************************
  66  * Declaration of local function
  67  *****************************************************************************/
  68 static void MP4_TrackCreate ( input_thread_t *, mp4_track_t *, MP4_Box_t  *);
  69 static void MP4_TrackDestroy( input_thread_t *, mp4_track_t * );
  70
  71 static int  MP4_TrackSelect ( input_thread_t *, mp4_track_t *, mtime_t );
  72 static void MP4_TrackUnselect(input_thread_t *, mp4_track_t * );
  73
  74 static int  MP4_TrackSeek   ( input_thread_t *, mp4_track_t *, mtime_t );
  75
  76 static uint64_t MP4_TrackGetPos    ( mp4_track_t * );
  77 static int      MP4_TrackSampleSize( mp4_track_t * );
  78 static int      MP4_TrackNextSample( input_thread_t *, mp4_track_t * );
  79 static void     MP4_TrackSetELST( input_thread_t *, mp4_track_t *, int64_t );
  80
  81 /* Return time in µs of a track */
  82 static inline int64_t MP4_TrackGetPTS( input_thread_t *p_input, mp4_track_t *p_track )
  83 {
  84     unsigned int i_sample;
  85     unsigned int i_index;
  86     int64_t i_dts;
  87
  88     i_sample = p_track->i_sample - p_track->chunk[p_track->i_chunk].i_sample_first;
  89     i_dts = p_track->chunk[p_track->i_chunk].i_first_dts;
  90     i_index = 0;
  91     while( i_sample > 0 )
  92     {
  93         if( i_sample > p_track->chunk[p_track->i_chunk].p_sample_count_dts[i_index] )
  94         {
  95             i_dts += p_track->chunk[p_track->i_chunk].p_sample_count_dts[i_index] *
  96                         p_track->chunk[p_track->i_chunk].p_sample_delta_dts[i_index];
  97             i_sample -= p_track->chunk[p_track->i_chunk].p_sample_count_dts[i_index];
  98             i_index++;
  99         }
 100         else
 101         {
 102             i_dts += i_sample *
 103                         p_track->chunk[p_track->i_chunk].p_sample_delta_dts[i_index];
 104             i_sample = 0;
 105             break;
 106         }
 107     }
 108
 109     /* now handle elst */
 110     if( p_track->p_elst )
 111     {
 112         demux_sys_t         *p_sys = p_input->p_demux_data;
 113         MP4_Box_data_elst_t *elst = p_track->p_elst->data.p_elst;
 114
 115         /* convert to offset */
 116         if( ( elst->i_media_rate_integer[p_track->i_elst] > 0 ||
 117               elst->i_media_rate_fraction[p_track->i_elst] > 0 ) &&
 118             elst->i_media_time[p_track->i_elst] > 0 )
 119         {
 120             i_dts -= elst->i_media_time[p_track->i_elst];
 121         }
 122
 123         /* add i_elst_time */
 124         i_dts += p_track->i_elst_time * p_track->i_timescale / p_sys->i_timescale;
 125
 126         if( i_dts < 0 ) i_dts = 0;
 127     }
 128
 129     return (int64_t)1000000 * i_dts / p_track->i_timescale;
 130 }
 131 static inline int64_t MP4_GetMoviePTS(demux_sys_t *p_sys )
 132 {
 133     return (int64_t)1000000 * p_sys->i_time / p_sys->i_timescale;
 134 }
 135
 136 #define FREE( p ) if( p ) { free( p ); (p) = NULL;}
 137
 138 /*****************************************************************************
 139  * Open: check file and initializes MP4 structures
 140  *****************************************************************************/
 141 static int Open( vlc_object_t * p_this )
 142 {
 143     input_thread_t  *p_input = (input_thread_t *)p_this;
 144     demux_sys_t     *p_sys;
 145
 146     uint8_t         *p_peek;
 147
 148     MP4_Box_t       *p_ftyp;
 149     MP4_Box_t       *p_rmra;
 150     MP4_Box_t       *p_mvhd;
 151     MP4_Box_t       *p_trak;
 152
 153     unsigned int    i;
 154     vlc_bool_t      b_seekable;
 155
 156     /* a little test to see if it could be a mp4 */
 157     if( stream_Peek( p_input->s, &p_peek, 8 ) < 8 )
 158     {
 159         msg_Warn( p_input, "MP4 plugin discarded (cannot peek)" );
 160         return VLC_EGENERIC;
 161     }
 162     switch( VLC_FOURCC( p_peek[4], p_peek[5], p_peek[6], p_peek[7] ) )
 163     {
 164         case FOURCC_ftyp:
 165         case FOURCC_moov:
 166         case FOURCC_foov:
 167         case FOURCC_moof:
 168         case FOURCC_mdat:
 169         case FOURCC_udta:
 170         case FOURCC_free:
 171         case FOURCC_skip:
 172         case FOURCC_wide:
 173         case VLC_FOURCC( 'p', 'n', 'o', 't' ):
 174             break;
 175          default:
 176             msg_Warn( p_input, "MP4 plugin discarded (not a valid file)" );
 177             return VLC_EGENERIC;
 178     }
 179
 180     /* I need to seek */
 181     stream_Control( p_input->s, STREAM_CAN_SEEK, &b_seekable );
 182     if( !b_seekable )
 183     {
 184         msg_Warn( p_input, "MP4 plugin discarded (unseekable)" );
 185         return VLC_EGENERIC;
 186     }
 187
 188     /*Set exported functions */
 189     p_input->pf_demux = Demux;
 190     p_input->pf_demux_control = Control;
 191
 192     /* create our structure that will contains all data */
 193     p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
 194     memset( p_sys, 0, sizeof( demux_sys_t ) );
 195
 196     /* Now load all boxes ( except raw data ) */
 197     if( ( p_sys->p_root = MP4_BoxGetRoot( p_input ) ) == NULL )
 198     {
 199         msg_Warn( p_input, "MP4 plugin discarded (not a valid file)" );
 200         goto error;
 201     }
 202
 203     MP4_BoxDumpStructure( p_input, p_sys->p_root );
 204
 205     if( ( p_ftyp = MP4_BoxGet( p_sys->p_root, "/ftyp" ) ) )
 206     {
 207         switch( p_ftyp->data.p_ftyp->i_major_brand )
 208         {
 209             case( FOURCC_isom ):
 210                 msg_Dbg( p_input,
 211                          "ISO Media file (isom) version %d.",
 212                          p_ftyp->data.p_ftyp->i_minor_version );
 213                 break;
 214             default:
 215                 msg_Dbg( p_input,
 216                          "unrecognized major file specification (%4.4s).",
 217                           (char*)&p_ftyp->data.p_ftyp->i_major_brand );
 218                 break;
 219         }
 220     }
 221     else
 222     {
 223         msg_Dbg( p_input, "file type box missing (assuming ISO Media file)" );
 224     }
 225
 226     /* the file need to have one moov box */
 227     if( MP4_BoxCount( p_sys->p_root, "/moov" ) <= 0 )
 228     {
 229         MP4_Box_t *p_foov = MP4_BoxGet( p_sys->p_root, "/foov" );
 230
 231         if( !p_foov )
 232         {
 233             msg_Err( p_input, "MP4 plugin discarded (no moov box)" );
 234             goto error;
 235         }
 236         /* we have a free box as a moov, rename it */
 237         p_foov->i_type = FOURCC_moov;
 238     }
 239
 240     if( ( p_rmra = MP4_BoxGet( p_sys->p_root,  "/moov/rmra" ) ) )
 241     {
 242         playlist_t *p_playlist;
 243         int        i_count = MP4_BoxCount( p_rmra, "rmda" );
 244         int        i;
 245
 246         msg_Dbg( p_input, "detected playlist mov file (%d ref)", i_count );
 247
 248         p_playlist =
 249             (playlist_t *)vlc_object_find( p_input,
 250                                            VLC_OBJECT_PLAYLIST,
 251                                            FIND_ANYWHERE );
 252         if( p_playlist )
 253         {
 254             //p_playlist->pp_items[p_playlist->i_index]->b_autodeletion = VLC_TRUE;
 255             for( i = 0; i < i_count; i++ )
 256             {
 257                 MP4_Box_t *p_rdrf = MP4_BoxGet( p_rmra, "rmda[%d]/rdrf", i );
 258                 char      *psz_ref;
 259                 uint32_t  i_ref_type;
 260
 261                 if( !p_rdrf || !( psz_ref = p_rdrf->data.p_rdrf->psz_ref ) )
 262                 {
 263                     continue;
 264                 }
 265                 i_ref_type = p_rdrf->data.p_rdrf->i_ref_type;
 266
 267                 msg_Dbg( p_input, "new ref=`%s' type=%4.4s",
 268                          psz_ref, (char*)&i_ref_type );
 269
 270                 if( i_ref_type == VLC_FOURCC( 'u', 'r', 'l', ' ' ) )
 271                 {
 272                     if( strstr( psz_ref, "qt5gateQT" ) )
 273                     {
 274                         msg_Dbg( p_input, "ignoring pseudo ref =`%s'", psz_ref );
 275                         continue;
 276                     }
 277                     if( !strncmp( psz_ref, "http://", 7 ) ||
 278                         !strncmp( psz_ref, "rtsp://", 7 ) )
 279                     {
 280                         msg_Dbg( p_input, "adding ref = `%s'", psz_ref );
 281                         playlist_Add( p_playlist, psz_ref, psz_ref,
 282                                       PLAYLIST_APPEND, PLAYLIST_END );
 283                     }
 284                     else
 285                     {
 286                         /* msg dbg relative ? */
 287                         char *psz_absolute = alloca( strlen( p_input->psz_source ) + strlen( psz_ref ) + 1);
 288                         char *end = strrchr( p_input->psz_source, '/' );
 289
 290                         if( end )
 291                         {
 292                             int i_len = end + 1 - p_input->psz_source;
 293
 294                             strncpy( psz_absolute, p_input->psz_source, i_len);
 295                             psz_absolute[i_len] = '\0';
 296                         }
 297                         else
 298                         {
 299                             strcpy( psz_absolute, "" );
 300                         }
 301                         strcat( psz_absolute, psz_ref );
 302                         msg_Dbg( p_input, "adding ref = `%s'", psz_absolute );
 303                         playlist_Add( p_playlist, psz_absolute, psz_absolute,
 304                                       PLAYLIST_APPEND, PLAYLIST_END );
 305                     }
 306                 }
 307                 else
 308                 {
 309                     msg_Err( p_input, "unknown ref type=%4.4s FIXME (send a bug report)",
 310                              (char*)&p_rdrf->data.p_rdrf->i_ref_type );
 311                 }
 312             }
 313             vlc_object_release( p_playlist );
 314         }
 315         else
 316         {
 317             msg_Err( p_input, "can't find playlist" );
 318         }
 319     }
 320
 321     if( !(p_mvhd = MP4_BoxGet( p_sys->p_root, "/moov/mvhd" ) ) )
 322     {
 323         if( !p_rmra )
 324         {
 325             msg_Err( p_input, "cannot find /moov/mvhd" );
 326             goto error;
 327         }
 328         else
 329         {
 330             msg_Warn( p_input, "cannot find /moov/mvhd (pure ref file)" );
 331             p_input->pf_demux = DemuxRef;
 332             return VLC_SUCCESS;
 333         }
 334     }
 335     else
 336     {
 337         p_sys->i_timescale = p_mvhd->data.p_mvhd->i_timescale;
 338         p_sys->i_duration = p_mvhd->data.p_mvhd->i_duration;
 339     }
 340
 341     if( !( p_sys->i_tracks = MP4_BoxCount( p_sys->p_root, "/moov/trak" ) ) )
 342     {
 343         msg_Err( p_input, "cannot find any /moov/trak" );
 344         goto error;
 345     }
 346     msg_Dbg( p_input, "find %d track%c",
 347                         p_sys->i_tracks,
 348                         p_sys->i_tracks ? 's':' ' );
 349
 350     /*  create one program */
 351     vlc_mutex_lock( &p_input->stream.stream_lock );
 352     if( input_InitStream( p_input, 0 ) == -1)
 353     {
 354         vlc_mutex_unlock( &p_input->stream.stream_lock );
 355         msg_Err( p_input, "cannot init stream" );
 356         goto error;
 357     }
 358     if( p_sys->i_duration/p_sys->i_timescale > 0 )
 359     {
 360         p_input->stream.i_mux_rate =
 361             p_input->stream.p_selected_area->i_size / 50 /
 362             ( p_sys->i_duration / p_sys->i_timescale );
 363     }
 364     else
 365     {
 366         p_input->stream.i_mux_rate = 0;
 367     }
 368     vlc_mutex_unlock( &p_input->stream.stream_lock );
 369
 370
 371     /* allocate memory */
 372     p_sys->track = calloc( p_sys->i_tracks, sizeof( mp4_track_t ) );
 373     memset( p_sys->track, 0, p_sys->i_tracks * sizeof( mp4_track_t ) );
 374
 375     /* now process each track and extract all usefull informations */
 376     for( i = 0; i < p_sys->i_tracks; i++ )
 377     {
 378         p_trak = MP4_BoxGet( p_sys->p_root, "/moov/trak[%d]", i );
 379         MP4_TrackCreate( p_input, &p_sys->track[i], p_trak );
 380
 381         if( p_sys->track[i].b_ok )
 382         {
 383             char *psz_cat;
 384             switch( p_sys->track[i].fmt.i_cat )
 385             {
 386                 case( VIDEO_ES ):
 387                     psz_cat = "video";
 388                     break;
 389                 case( AUDIO_ES ):
 390                     psz_cat = "audio";
 391                     break;
 392                 default:
 393                     psz_cat = "unknown";
 394                     break;
 395             }
 396
 397             msg_Dbg( p_input, "adding track[Id 0x%x] %s (%s) language %s",
 398                             p_sys->track[i].i_track_ID,
 399                             psz_cat,
 400                             p_sys->track[i].b_enable ? "enable":"disable",
 401                             p_sys->track[i].fmt.psz_language ? p_sys->track[i].fmt.psz_language : "undef" );
 402         }
 403         else
 404         {
 405             msg_Dbg( p_input, "ignoring track[Id 0x%x]", p_sys->track[i].i_track_ID );
 406         }
 407
 408     }
 409     return VLC_SUCCESS;
 410
 411 error:
 412     if( p_sys->p_root )
 413     {
 414         MP4_BoxFree( p_input, p_sys->p_root );
 415     }
 416     free( p_sys );
 417     return VLC_EGENERIC;
 418 }
 419
 420 /*****************************************************************************
 421  * Demux: read packet and send them to decoders
 422  *****************************************************************************
 423  * TODO check for newly selected track (ie audio upt to now )
 424  *****************************************************************************/
 425 static int Demux( input_thread_t *p_input )
 426 {
 427     demux_sys_t *p_sys = p_input->p_demux_data;
 428     unsigned int i_track;
 429
 430
 431     unsigned int i_track_selected;
 432     vlc_bool_t   b_play_audio;
 433
 434     /* check for newly selected/unselected track */
 435     for( i_track = 0, i_track_selected = 0; i_track <  p_sys->i_tracks; i_track++ )
 436     {
 437         mp4_track_t *tk = &p_sys->track[i_track];
 438
 439         if( tk->b_selected && tk->i_sample >= tk->i_sample_count )
 440         {
 441             msg_Warn( p_input, "track[0x%x] will be disabled", tk->i_track_ID );
 442             MP4_TrackUnselect( p_input, tk);
 443         }
 444         else if( tk->b_ok )
 445         {
 446             vlc_bool_t b;
 447             es_out_Control( p_input->p_es_out, ES_OUT_GET_ES_STATE, tk->p_es, &b );
 448
 449             if( tk->b_selected && !b )
 450             {
 451                 MP4_TrackUnselect( p_input, tk );
 452             }
 453             else if( !tk->b_selected && b)
 454             {
 455                 MP4_TrackSelect( p_input, tk, MP4_GetMoviePTS( p_sys ) );
 456             }
 457
 458             if( tk->b_selected )
 459             {
 460                 i_track_selected++;
 461             }
 462         }
 463     }
 464
 465     if( i_track_selected <= 0 )
 466     {
 467         msg_Warn( p_input, "no track selected, exiting..." );
 468         return 0;
 469     }
 470
 471     /* first wait for the good time to read a packet */
 472     input_ClockManageRef( p_input,
 473                           p_input->stream.p_selected_program,
 474                           p_sys->i_pcr );
 475
 476     /* update pcr XXX in mpeg scale so in 90000 unit/s */
 477     p_sys->i_pcr = MP4_GetMoviePTS( p_sys ) * 9 / 100;
 478
 479     /* we will read 100ms for each stream so ...*/
 480     p_sys->i_time += __MAX( p_sys->i_timescale / 10 , 1 );
 481
 482     /* Check if we need to send the audio data to decoder */
 483     b_play_audio = !p_input->stream.control.b_mute;
 484
 485     for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
 486     {
 487         mp4_track_t *tk = &p_sys->track[i_track];
 488
 489         if( !tk->b_ok || !tk->b_selected )
 490         {
 491             continue;
 492         }
 493
 494         while( MP4_TrackGetPTS( p_input, tk ) < MP4_GetMoviePTS( p_sys ) )
 495         {
 496 #if 0
 497             msg_Dbg( p_input, "tk=%lld mv=%lld",
 498                      MP4_TrackGetPTS( p_input, tk ),
 499                      MP4_GetMoviePTS( p_sys ) );
 500 #endif
 501
 502             if( MP4_TrackSampleSize( tk ) > 0 &&
 503                 ( b_play_audio || tk->fmt.i_cat != AUDIO_ES ) )
 504             {
 505                 block_t *p_block;
 506
 507                 /* go,go go ! */
 508                 if( stream_Seek( p_input->s, MP4_TrackGetPos( tk ) ) )
 509                 {
 510                     msg_Warn( p_input, "track[0x%x] will be disabled (eof?)", tk->i_track_ID );
 511                     MP4_TrackUnselect( p_input, tk );
 512                     break;
 513                 }
 514
 515                 /* now read pes */
 516                 if( ( p_block = stream_Block( p_input->s,
 517                                               MP4_TrackSampleSize( tk ) ) ) == NULL )
 518                 {
 519                     msg_Warn( p_input, "track[0x%x] will be disabled (eof?)", tk->i_track_ID );
 520                     MP4_TrackUnselect( p_input, tk );
 521                     break;
 522                 }
 523
 524                 if( tk->b_drms && tk->p_drms )
 525                 {
 526                     drms_decrypt( tk->p_drms,
 527                                   (uint32_t*)p_block->p_buffer,
 528                                   p_block->i_buffer );
 529                 }
 530                 p_block->i_dts =
 531                     input_ClockGetTS( p_input,
 532                                       p_input->stream.p_selected_program,
 533                                       MP4_TrackGetPTS( p_input, tk ) * 9/100 );
 534
 535                 p_block->i_pts = tk->fmt.i_cat == VIDEO_ES ? 0 : p_block->i_dts;
 536
 537                 if( !tk->b_drms || ( tk->b_drms && tk->p_drms ) )
 538                 {
 539                     es_out_Send( p_input->p_es_out, tk->p_es, p_block );
 540                 }
 541             }
 542
 543             /* Next sample */
 544             if( MP4_TrackNextSample( p_input, tk ) )
 545             {
 546                 break;
 547             }
 548         }
 549     }
 550
 551     return 1;
 552 }
 553 /*****************************************************************************
 554  * Seek: Got to i_date
 555  ******************************************************************************/
 556 static int   Seek     ( input_thread_t *p_input, mtime_t i_date )
 557 {
 558     demux_sys_t *p_sys = p_input->p_demux_data;
 559     unsigned int i_track;
 560
 561     /* First update update global time */
 562     p_sys->i_time = i_date * p_sys->i_timescale / 1000000;
 563     p_sys->i_pcr  = i_date* 9 / 100;
 564
 565     /* Now for each stream try to go to this time */
 566     for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
 567     {
 568         mp4_track_t *tk = &p_sys->track[i_track];
 569
 570         if( tk->b_ok && tk->b_selected )
 571         {
 572             MP4_TrackSeek( p_input, tk, i_date );
 573         }
 574     }
 575     return( 1 );
 576 }
 577
 578 /*****************************************************************************
 579  * Control:
 580  *****************************************************************************/
 581 static int Control( input_thread_t *p_input, int i_query, va_list args )
 582 {
 583     demux_sys_t *p_sys = p_input->p_demux_data;
 584
 585     double f, *pf;
 586     int64_t i64, *pi64;
 587
 588     switch( i_query )
 589     {
 590         case DEMUX_GET_POSITION:
 591             pf = (double*)va_arg( args, double * );
 592             if( p_sys->i_duration > 0 )
 593             {
 594                 *pf = (double)p_sys->i_time / (double)p_sys->i_duration;
 595             }
 596             else
 597             {
 598                 *pf = 0.0;
 599             }
 600             return VLC_SUCCESS;
 601
 602         case DEMUX_SET_POSITION:
 603             f = (double)va_arg( args, double );
 604             if( p_sys->i_timescale > 0 )
 605             {
 606                 i64 = (int64_t)( f * (double)1000000 *
 607                                  (double)p_sys->i_duration /
 608                                  (double)p_sys->i_timescale );
 609                 return Seek( p_input, i64 );
 610             }
 611             else return VLC_SUCCESS;
 612
 613         case DEMUX_GET_TIME:
 614             pi64 = (int64_t*)va_arg( args, int64_t * );
 615             if( p_sys->i_timescale > 0 )
 616             {
 617                 *pi64 = (mtime_t)1000000 *
 618                         (mtime_t)p_sys->i_time /
 619                         (mtime_t)p_sys->i_timescale;
 620             }
 621             else *pi64 = 0;
 622             return VLC_SUCCESS;
 623
 624         case DEMUX_SET_TIME:
 625             i64 = (int64_t)va_arg( args, int64_t );
 626             return Seek( p_input, i64 );
 627
 628         case DEMUX_GET_LENGTH:
 629             pi64 = (int64_t*)va_arg( args, int64_t * );
 630             if( p_sys->i_timescale > 0 )
 631             {
 632                 *pi64 = (mtime_t)1000000 *
 633                         (mtime_t)p_sys->i_duration /
 634                         (mtime_t)p_sys->i_timescale;
 635             }
 636             else *pi64 = 0;
 637             return VLC_SUCCESS;
 638
 639         case DEMUX_GET_FPS:
 640             msg_Warn( p_input, "DEMUX_GET_FPS unimplemented !!" );
 641             return VLC_EGENERIC;
 642
 643         case DEMUX_GET_META:
 644         {
 645             vlc_meta_t **pp_meta = (vlc_meta_t**)va_arg( args, vlc_meta_t** );
 646             vlc_meta_t *meta;
 647             MP4_Box_t  *p_udta   = MP4_BoxGet( p_sys->p_root, "/moov/udta" );
 648             MP4_Box_t  *p_0xa9xxx;
 649             if( p_udta == NULL )
 650             {
 651                 return VLC_EGENERIC;
 652             }
 653             *pp_meta = meta = vlc_meta_New();
 654             for( p_0xa9xxx = p_udta->p_first; p_0xa9xxx != NULL; p_0xa9xxx = p_0xa9xxx->p_next )
 655             {
 656                 switch( p_0xa9xxx->i_type )
 657                 {
 658                     case FOURCC_0xa9nam:
 659                         vlc_meta_Add( meta, VLC_META_TITLE, p_0xa9xxx->data.p_0xa9xxx->psz_text );
 660                         break;
 661                     case FOURCC_0xa9aut:
 662                         vlc_meta_Add( meta, VLC_META_AUTHOR, p_0xa9xxx->data.p_0xa9xxx->psz_text );
 663                         break;
 664                     case FOURCC_0xa9ART:
 665                         vlc_meta_Add( meta, VLC_META_ARTIST, p_0xa9xxx->data.p_0xa9xxx->psz_text );
 666                         break;
 667                     case FOURCC_0xa9cpy:
 668                         vlc_meta_Add( meta, VLC_META_COPYRIGHT, p_0xa9xxx->data.p_0xa9xxx->psz_text );
 669                         break;
 670                     case FOURCC_0xa9day:
 671                         vlc_meta_Add( meta, VLC_META_DATE, p_0xa9xxx->data.p_0xa9xxx->psz_text );
 672                         break;
 673
 674                     case FOURCC_0xa9swr:
 675                     case FOURCC_0xa9inf:
 676                     case FOURCC_0xa9dir:
 677                     case FOURCC_0xa9cmt:
 678                     case FOURCC_0xa9req:
 679                     case FOURCC_0xa9fmt:
 680                     case FOURCC_0xa9prd:
 681                     case FOURCC_0xa9prf:
 682                     case FOURCC_0xa9src:
 683                         /* TODO one day, but they aren't really meaningfull */
 684                         break;
 685
 686                     default:
 687                         break;
 688                 }
 689             }
 690             return VLC_SUCCESS;
 691         }
 692
 693         default:
 694             msg_Err( p_input, "control query unimplemented !!!" );
 695             return demux_vaControlDefault( p_input, i_query, args );
 696     }
 697 }
 698
 699 /*****************************************************************************
 700  * Close: frees unused data
 701  *****************************************************************************/
 702 static void Close ( vlc_object_t * p_this )
 703 {
 704     unsigned int i_track;
 705     input_thread_t *  p_input = (input_thread_t *)p_this;
 706     demux_sys_t *p_sys = p_input->p_demux_data;
 707
 708     msg_Dbg( p_input, "freeing all memory" );
 709
 710     MP4_BoxFree( p_input, p_sys->p_root );
 711     for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
 712     {
 713         MP4_TrackDestroy( p_input, &p_sys->track[i_track] );
 714     }
 715     FREE( p_sys->track );
 716
 717     free( p_sys );
 718 }
 719
 720
 721
 722 /****************************************************************************
 723  * Local functions, specific to vlc
 724  ****************************************************************************/
 725
 726 /* now create basic chunk data, the rest will be filled by MP4_CreateSamplesIndex */
 727 static int TrackCreateChunksIndex( input_thread_t *p_input,
 728                                    mp4_track_t *p_demux_track )
 729 {
 730     MP4_Box_t *p_co64; /* give offset for each chunk, same for stco and co64 */
 731     MP4_Box_t *p_stsc;
 732
 733     unsigned int i_chunk;
 734     unsigned int i_index, i_last;
 735
 736     if( ( !(p_co64 = MP4_BoxGet( p_demux_track->p_stbl, "stco" ) )&&
 737           !(p_co64 = MP4_BoxGet( p_demux_track->p_stbl, "co64" ) ) )||
 738         ( !(p_stsc = MP4_BoxGet( p_demux_track->p_stbl, "stsc" ) ) ))
 739     {
 740         return( VLC_EGENERIC );
 741     }
 742
 743     p_demux_track->i_chunk_count = p_co64->data.p_co64->i_entry_count;
 744     if( !p_demux_track->i_chunk_count )
 745     {
 746         msg_Warn( p_input, "no chunk defined" );
 747         return( VLC_EGENERIC );
 748     }
 749     p_demux_track->chunk = calloc( p_demux_track->i_chunk_count,
 750                                    sizeof( mp4_chunk_t ) );
 751
 752     /* first we read chunk offset */
 753     for( i_chunk = 0; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
 754     {
 755         p_demux_track->chunk[i_chunk].i_offset =
 756                 p_co64->data.p_co64->i_chunk_offset[i_chunk];
 757     }
 758
 759     /* now we read index for SampleEntry( soun vide mp4a mp4v ...)
 760         to be used for the sample XXX begin to 1
 761         We construct it begining at the end */
 762     i_last = p_demux_track->i_chunk_count; /* last chunk proceded */
 763     i_index = p_stsc->data.p_stsc->i_entry_count;
 764     if( !i_index )
 765     {
 766         msg_Warn( p_input, "cannot read chunk table or table empty" );
 767         return( VLC_EGENERIC );
 768     }
 769
 770     while( i_index )
 771     {
 772         i_index--;
 773         for( i_chunk = p_stsc->data.p_stsc->i_first_chunk[i_index] - 1;
 774                 i_chunk < i_last; i_chunk++ )
 775         {
 776             p_demux_track->chunk[i_chunk].i_sample_description_index =
 777                     p_stsc->data.p_stsc->i_sample_description_index[i_index];
 778             p_demux_track->chunk[i_chunk].i_sample_count =
 779                     p_stsc->data.p_stsc->i_samples_per_chunk[i_index];
 780         }
 781         i_last = p_stsc->data.p_stsc->i_first_chunk[i_index] - 1;
 782     }
 783
 784     p_demux_track->chunk[0].i_sample_first = 0;
 785     for( i_chunk = 1; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
 786     {
 787         p_demux_track->chunk[i_chunk].i_sample_first =
 788             p_demux_track->chunk[i_chunk-1].i_sample_first +
 789                 p_demux_track->chunk[i_chunk-1].i_sample_count;
 790     }
 791
 792     msg_Dbg( p_input,
 793              "track[Id 0x%x] read %d chunk",
 794              p_demux_track->i_track_ID,
 795              p_demux_track->i_chunk_count );
 796
 797     return( VLC_SUCCESS );
 798 }
 799 static int TrackCreateSamplesIndex( input_thread_t *p_input,
 800                                     mp4_track_t *p_demux_track )
 801 {
 802     MP4_Box_t *p_stts; /* makes mapping between sample and decoding time,
 803                           ctts make same mapping but for composition time,
 804                           not yet used and probably not usefull */
 805     MP4_Box_t *p_stsz; /* gives sample size of each samples, there is also stz2
 806                           that uses a compressed form FIXME make them in libmp4
 807                           as a unique type */
 808     /* TODO use also stss and stsh table for seeking */
 809     /* FIXME use edit table */
 810     int64_t i_sample;
 811     int64_t i_chunk;
 812
 813     int64_t i_index;
 814     int64_t i_index_sample_used;
 815
 816     int64_t i_last_dts;
 817
 818     p_stts = MP4_BoxGet( p_demux_track->p_stbl, "stts" );
 819     p_stsz = MP4_BoxGet( p_demux_track->p_stbl, "stsz" ); /* FIXME and stz2 */
 820
 821     if( ( !p_stts )||( !p_stsz ) )
 822     {
 823         msg_Warn( p_input, "cannot read sample table" );
 824         return( VLC_EGENERIC );
 825     }
 826
 827     p_demux_track->i_sample_count = p_stsz->data.p_stsz->i_sample_count;
 828
 829
 830     /* for sample size, there are 2 case */
 831     if( p_stsz->data.p_stsz->i_sample_size )
 832     {
 833         /* 1: all sample have the same size, so no need to construct a table */
 834         p_demux_track->i_sample_size = p_stsz->data.p_stsz->i_sample_size;
 835         p_demux_track->p_sample_size = NULL;
 836     }
 837     else
 838     {
 839         /* 2: each sample can have a different size */
 840         p_demux_track->i_sample_size = 0;
 841         p_demux_track->p_sample_size =
 842             calloc( p_demux_track->i_sample_count, sizeof( uint32_t ) );
 843
 844         for( i_sample = 0; i_sample < p_demux_track->i_sample_count; i_sample++ )
 845         {
 846             p_demux_track->p_sample_size[i_sample] =
 847                     p_stsz->data.p_stsz->i_entry_size[i_sample];
 848         }
 849     }
 850     /* we have extract all information from stsz,
 851         now use stts */
 852
 853     /* if we don't want to waste too much memory, we can't expand
 854        the box !, so each chunk will contain an "extract" of this table
 855        for fast research */
 856
 857     i_last_dts = 0;
 858     i_index = 0; i_index_sample_used =0;
 859
 860     /* create and init last data for each chunk */
 861     for(i_chunk = 0 ; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
 862     {
 863
 864         int64_t i_entry, i_sample_count, i;
 865         /* save last dts */
 866         p_demux_track->chunk[i_chunk].i_first_dts = i_last_dts;
 867     /* count how many entries needed for this chunk
 868        for p_sample_delta_dts and p_sample_count_dts */
 869
 870         i_sample_count = p_demux_track->chunk[i_chunk].i_sample_count;
 871
 872         i_entry = 0;
 873         while( i_sample_count > 0 )
 874         {
 875             i_sample_count -= p_stts->data.p_stts->i_sample_count[i_index+i_entry];
 876             if( i_entry == 0 )
 877             {
 878                 i_sample_count += i_index_sample_used; /* don't count already used sample
 879                                                    int this entry */
 880             }
 881             i_entry++;
 882         }
 883
 884         /* allocate them */
 885         p_demux_track->chunk[i_chunk].p_sample_count_dts =
 886             calloc( i_entry, sizeof( uint32_t ) );
 887         p_demux_track->chunk[i_chunk].p_sample_delta_dts =
 888             calloc( i_entry, sizeof( uint32_t ) );
 889
 890         /* now copy */
 891         i_sample_count = p_demux_track->chunk[i_chunk].i_sample_count;
 892         for( i = 0; i < i_entry; i++ )
 893         {
 894             int64_t i_used;
 895             int64_t i_rest;
 896
 897             i_rest = p_stts->data.p_stts->i_sample_count[i_index] - i_index_sample_used;
 898
 899             i_used = __MIN( i_rest, i_sample_count );
 900
 901             i_index_sample_used += i_used;
 902             i_sample_count -= i_used;
 903
 904             p_demux_track->chunk[i_chunk].p_sample_count_dts[i] = i_used;
 905
 906             p_demux_track->chunk[i_chunk].p_sample_delta_dts[i] =
 907                         p_stts->data.p_stts->i_sample_delta[i_index];
 908
 909             i_last_dts += i_used *
 910                     p_demux_track->chunk[i_chunk].p_sample_delta_dts[i];
 911
 912             if( i_index_sample_used >=
 913                              p_stts->data.p_stts->i_sample_count[i_index] )
 914             {
 915
 916                 i_index++;
 917                 i_index_sample_used = 0;
 918             }
 919         }
 920
 921     }
 922
 923     msg_Dbg( p_input,
 924              "track[Id 0x%x] read %d samples length:"I64Fd"s",
 925              p_demux_track->i_track_ID,
 926              p_demux_track->i_sample_count,
 927              i_last_dts / p_demux_track->i_timescale );
 928
 929     return( VLC_SUCCESS );
 930 }
 931
 932 /*
 933  * TrackCreateES:
 934  *  Create ES and PES to init decoder if needed, for a track starting at i_chunk
 935  */
 936 static int  TrackCreateES   ( input_thread_t   *p_input,
 937                               mp4_track_t *p_track,
 938                               unsigned int     i_chunk,
 939                               es_out_id_t      **pp_es )
 940 {
 941     MP4_Box_t   *p_sample;
 942     MP4_Box_t   *p_esds;
 943
 944     *pp_es = NULL;
 945
 946     if( !p_track->chunk[i_chunk].i_sample_description_index )
 947     {
 948         msg_Warn( p_input,
 949                   "invalid SampleEntry index (track[Id 0x%x])",
 950                   p_track->i_track_ID );
 951         return VLC_EGENERIC;
 952     }
 953
 954     p_sample = MP4_BoxGet(  p_track->p_stsd, "[%d]",
 955                 p_track->chunk[i_chunk].i_sample_description_index - 1 );
 956
 957     if( !p_sample || !p_sample->data.p_data )
 958     {
 959         msg_Warn( p_input,
 960                   "cannot find SampleEntry (track[Id 0x%x])",
 961                   p_track->i_track_ID );
 962         return( VLC_EGENERIC );
 963     }
 964
 965     p_track->p_sample = p_sample;
 966
 967     if( p_track->i_sample_size == 1 )
 968     {
 969         MP4_Box_data_sample_soun_t *p_soun;
 970
 971         p_soun = p_sample->data.p_sample_soun;
 972
 973         if( p_soun->i_qt_version == 0 )
 974         {
 975             switch( p_sample->i_type )
 976             {
 977                 case VLC_FOURCC( 'i', 'm', 'a', '4' ):
 978                     p_soun->i_qt_version = 1;
 979                     p_soun->i_sample_per_packet = 64;
 980                     p_soun->i_bytes_per_packet  = 34;
 981                     p_soun->i_bytes_per_frame   = 34 * p_soun->i_channelcount;
 982                     p_soun->i_bytes_per_sample  = 2;
 983                     break;
 984                 case VLC_FOURCC( 'M', 'A', 'C', '3' ):
 985                     p_soun->i_qt_version = 1;
 986                     p_soun->i_sample_per_packet = 6;
 987                     p_soun->i_bytes_per_packet  = 2;
 988                     p_soun->i_bytes_per_frame   = 2 * p_soun->i_channelcount;
 989                     p_soun->i_bytes_per_sample  = 2;
 990                     break;
 991                 case VLC_FOURCC( 'M', 'A', 'C', '6' ):
 992                     p_soun->i_qt_version = 1;
 993                     p_soun->i_sample_per_packet = 12;
 994                     p_soun->i_bytes_per_packet  = 2;
 995                     p_soun->i_bytes_per_frame   = 2 * p_soun->i_channelcount;
 996                     p_soun->i_bytes_per_sample  = 2;
 997                     break;
 998                 default:
 999                     break;
1000             }
1001
1002         }
1003         else if( p_soun->i_qt_version == 1 && p_soun->i_sample_per_packet <= 0 )
1004         {
1005             p_soun->i_qt_version = 0;
1006         }
1007     }
1008
1009
1010     /* It's a little ugly but .. there are special cases */
1011     switch( p_sample->i_type )
1012     {
1013         case( VLC_FOURCC( '.', 'm', 'p', '3' ) ):
1014         case( VLC_FOURCC( 'm', 's', 0x00, 0x55 ) ):
1015             p_track->fmt.i_codec = VLC_FOURCC( 'm', 'p', 'g', 'a' );
1016             break;
1017         case( VLC_FOURCC( 'r', 'a', 'w', ' ' ) ):
1018             p_track->fmt.i_codec = VLC_FOURCC( 'a', 'r', 'a', 'w' );
1019             break;
1020         case( VLC_FOURCC( 's', '2', '6', '3' ) ):
1021             p_track->fmt.i_codec = VLC_FOURCC( 'h', '2', '6', '3' );
1022             break;
1023         default:
1024             p_track->fmt.i_codec = p_sample->i_type;
1025             break;
1026     }
1027
1028     /* now see if esds is present and if so create a data packet
1029         with decoder_specific_info  */
1030 #define p_decconfig p_esds->data.p_esds->es_descriptor.p_decConfigDescr
1031     if( ( ( p_esds = MP4_BoxGet( p_sample, "esds" ) ) ||
1032           ( p_esds = MP4_BoxGet( p_sample, "wave/esds" ) ) )&&
1033         ( p_esds->data.p_esds )&&
1034         ( p_decconfig ) )
1035     {
1036         /* First update information based on i_objectTypeIndication */
1037         switch( p_decconfig->i_objectTypeIndication )
1038         {
1039             case( 0x20 ): /* MPEG4 VIDEO */
1040                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','4','v' );
1041                 break;
1042             case( 0x40):
1043                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','4','a' );
1044                 break;
1045             case( 0x60):
1046             case( 0x61):
1047             case( 0x62):
1048             case( 0x63):
1049             case( 0x64):
1050             case( 0x65): /* MPEG2 video */
1051                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
1052                 break;
1053             /* Theses are MPEG2-AAC */
1054             case( 0x66): /* main profile */
1055             case( 0x67): /* Low complexity profile */
1056             case( 0x68): /* Scaleable Sampling rate profile */
1057                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','4','a' );
1058                 break;
1059             /* true MPEG 2 audio */
1060             case( 0x69):
1061                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','a' );
1062                 break;
1063             case( 0x6a): /* MPEG1 video */
1064                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
1065                 break;
1066             case( 0x6b): /* MPEG1 audio */
1067                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','a' );
1068                 break;
1069             case( 0x6c ): /* jpeg */
1070                 p_track->fmt.i_codec = VLC_FOURCC( 'j','p','e','g' );
1071                 break;
1072             default:
1073                 /* Unknown entry, but don't touch i_fourcc */
1074                 msg_Warn( p_input,
1075                           "unknown objectTypeIndication(0x%x) (Track[ID 0x%x])",
1076                           p_decconfig->i_objectTypeIndication,
1077                           p_track->i_track_ID );
1078                 break;
1079         }
1080         p_track->fmt.i_extra = p_decconfig->i_decoder_specific_info_len;
1081         if( p_track->fmt.i_extra > 0 )
1082         {
1083             p_track->fmt.p_extra = malloc( p_track->fmt.i_extra );
1084             memcpy( p_track->fmt.p_extra, p_decconfig->p_decoder_specific_info,
1085                     p_track->fmt.i_extra );
1086         }
1087     }
1088     else
1089     {
1090         switch( p_sample->i_type )
1091         {
1092             /* qt decoder, send the complete chunk */
1093             case VLC_FOURCC( 'S', 'V', 'Q', '3' ):
1094             case VLC_FOURCC( 'S', 'V', 'Q', '1' ):
1095             case VLC_FOURCC( 'V', 'P', '3', '1' ):
1096             case VLC_FOURCC( '3', 'I', 'V', '1' ):
1097             case VLC_FOURCC( 'Z', 'y', 'G', 'o' ):
1098                 p_track->fmt.i_extra =
1099                     p_sample->data.p_sample_vide->i_qt_image_description;
1100                 if( p_track->fmt.i_extra > 0 )
1101                 {
1102                     p_track->fmt.p_extra = malloc( p_track->fmt.i_extra );
1103                     memcpy( p_track->fmt.p_extra,
1104                             p_sample->data.p_sample_vide->p_qt_image_description,
1105                             p_track->fmt.i_extra);
1106                 }
1107                 break;
1108             case VLC_FOURCC( 'Q', 'D', 'M', 'C' ):
1109             case VLC_FOURCC( 'Q', 'D', 'M', '2' ):
1110             case VLC_FOURCC( 'Q', 'c', 'l', 'p' ):
1111             case VLC_FOURCC( 's', 'a', 'm', 'r' ):
1112                 p_track->fmt.i_extra =
1113                     p_sample->data.p_sample_soun->i_qt_description;
1114                 if( p_track->fmt.i_extra > 0 )
1115                 {
1116                     p_track->fmt.p_extra = malloc( p_track->fmt.i_extra );
1117                     memcpy( p_track->fmt.p_extra,
1118                             p_sample->data.p_sample_soun->p_qt_description,
1119                             p_track->fmt.i_extra);
1120                 }
1121                 break;
1122             default:
1123                 break;
1124         }
1125     }
1126
1127 #undef p_decconfig
1128
1129     /* some last initialisation */
1130     switch( p_track->fmt.i_cat )
1131     {
1132     case( VIDEO_ES ):
1133         p_track->fmt.video.i_width = p_sample->data.p_sample_vide->i_width;
1134         p_track->fmt.video.i_height = p_sample->data.p_sample_vide->i_height;
1135
1136         /* fall on display size */
1137         if( p_track->fmt.video.i_width <= 0 )
1138             p_track->fmt.video.i_width = p_track->i_width;
1139         if( p_track->fmt.video.i_height <= 0 )
1140             p_track->fmt.video.i_height = p_track->i_height;
1141
1142         /* Find out apect ratio from display size */
1143         if( p_track->i_width > 0 && p_track->i_height > 0 )
1144             p_track->fmt.video.i_aspect =
1145                 VOUT_ASPECT_FACTOR * p_track->i_width / p_track->i_height;
1146
1147         break;
1148
1149     case( AUDIO_ES ):
1150         p_track->fmt.audio.i_channels =
1151             p_sample->data.p_sample_soun->i_channelcount;
1152         p_track->fmt.audio.i_rate =
1153             p_sample->data.p_sample_soun->i_sampleratehi;
1154         p_track->fmt.i_bitrate = p_sample->data.p_sample_soun->i_channelcount *
1155             p_sample->data.p_sample_soun->i_sampleratehi *
1156                 p_sample->data.p_sample_soun->i_samplesize;
1157         p_track->fmt.audio.i_bitspersample =
1158             p_sample->data.p_sample_soun->i_samplesize;
1159         break;
1160
1161     default:
1162         break;
1163     }
1164
1165     *pp_es = es_out_Add( p_input->p_es_out, &p_track->fmt );
1166
1167     return VLC_SUCCESS;
1168 }
1169
1170 /* given a time it return sample/chunk
1171  * it also update elst field of the track
1172  */
1173 static int  TrackTimeToSampleChunk( input_thread_t *p_input,
1174                                     mp4_track_t *p_track,
1175                                     int64_t i_start,
1176                                     uint32_t *pi_chunk,
1177                                     uint32_t *pi_sample )
1178 {
1179     demux_sys_t *p_sys = p_input->p_demux_data;
1180     MP4_Box_t   *p_stss;
1181     uint64_t     i_dts;
1182     unsigned int i_sample;
1183     unsigned int i_chunk;
1184     int          i_index;
1185
1186     /* FIXME see if it's needed to check p_track->i_chunk_count */
1187     if( !p_track->b_ok || p_track->i_chunk_count == 0 )
1188     {
1189         return( VLC_EGENERIC );
1190     }
1191
1192     /* handle elst (find the correct one) */
1193     MP4_TrackSetELST( p_input, p_track, i_start );
1194     if( p_track->p_elst && p_track->p_elst->data.p_elst->i_entry_count > 0 )
1195     {
1196         MP4_Box_data_elst_t *elst = p_track->p_elst->data.p_elst;
1197         int64_t i_mvt= i_start * p_sys->i_timescale / (int64_t)1000000;
1198
1199         /* now calculate i_start for this elst */
1200         /* offset */
1201         i_start -= p_track->i_elst_time * (int64_t)1000000 / p_sys->i_timescale;
1202         if( i_start < 0 )
1203         {
1204             *pi_chunk = 0;
1205             *pi_sample= 0;
1206
1207             return VLC_SUCCESS;
1208         }
1209         /* to track time scale */
1210         i_start  = i_start * p_track->i_timescale / (int64_t)1000000;
1211         /* add elst offset */
1212         if( ( elst->i_media_rate_integer[p_track->i_elst] > 0 ||
1213              elst->i_media_rate_fraction[p_track->i_elst] > 0 ) &&
1214             elst->i_media_time[p_track->i_elst] > 0 )
1215         {
1216             i_start += elst->i_media_time[p_track->i_elst];
1217         }
1218
1219         msg_Dbg( p_input, "elst (%d) gives "I64Fd"ms (movie)-> "I64Fd"ms (track)",
1220                  p_track->i_elst,
1221                  i_mvt * 1000 / p_sys->i_timescale,
1222                  i_start * 1000 / p_track->i_timescale );
1223     }
1224     else
1225     {
1226         /* convert absolute time to in timescale unit */
1227         i_start = i_start * p_track->i_timescale / (int64_t)1000000;
1228     }
1229
1230     /* we start from sample 0/chunk 0, hope it won't take too much time */
1231     /* *** find good chunk *** */
1232     for( i_chunk = 0; ; i_chunk++ )
1233     {
1234         if( i_chunk + 1 >= p_track->i_chunk_count )
1235         {
1236             /* at the end and can't check if i_start in this chunk,
1237                it will be check while searching i_sample */
1238             i_chunk = p_track->i_chunk_count - 1;
1239             break;
1240         }
1241
1242         if( i_start >= p_track->chunk[i_chunk].i_first_dts &&
1243             i_start <  p_track->chunk[i_chunk + 1].i_first_dts )
1244         {
1245             break;
1246         }
1247     }
1248
1249     /* *** find sample in the chunk *** */
1250     i_sample = p_track->chunk[i_chunk].i_sample_first;
1251     i_dts    = p_track->chunk[i_chunk].i_first_dts;
1252     for( i_index = 0; i_sample < p_track->chunk[i_chunk].i_sample_count; )
1253     {
1254         if( i_dts +
1255             p_track->chunk[i_chunk].p_sample_count_dts[i_index] *
1256             p_track->chunk[i_chunk].p_sample_delta_dts[i_index] < i_start )
1257         {
1258             i_dts    +=
1259                 p_track->chunk[i_chunk].p_sample_count_dts[i_index] *
1260                 p_track->chunk[i_chunk].p_sample_delta_dts[i_index];
1261
1262             i_sample += p_track->chunk[i_chunk].p_sample_count_dts[i_index];
1263             i_index++;
1264         }
1265         else
1266         {
1267             if( p_track->chunk[i_chunk].p_sample_delta_dts[i_index] <= 0 )
1268             {
1269                 break;
1270             }
1271             i_sample += ( i_start - i_dts ) / p_track->chunk[i_chunk].p_sample_delta_dts[i_index];
1272             break;
1273         }
1274     }
1275
1276     if( i_sample >= p_track->i_sample_count )
1277     {
1278         msg_Warn( p_input,
1279                   "track[Id 0x%x] will be disabled (seeking too far) chunk=%d sample=%d",
1280                   p_track->i_track_ID, i_chunk, i_sample );
1281         return( VLC_EGENERIC );
1282     }
1283
1284
1285     /* *** Try to find nearest sync points *** */
1286     if( ( p_stss = MP4_BoxGet( p_track->p_stbl, "stss" ) ) )
1287     {
1288         unsigned int i_index;
1289         msg_Dbg( p_input,
1290                     "track[Id 0x%x] using Sync Sample Box (stss)",
1291                     p_track->i_track_ID );
1292         for( i_index = 0; i_index < p_stss->data.p_stss->i_entry_count; i_index++ )
1293         {
1294             if( p_stss->data.p_stss->i_sample_number[i_index] >= i_sample )
1295             {
1296                 if( i_index > 0 )
1297                 {
1298                     msg_Dbg( p_input, "stts gives %d --> %d (sample number)",
1299                             i_sample,
1300                             p_stss->data.p_stss->i_sample_number[i_index-1] );
1301                     i_sample = p_stss->data.p_stss->i_sample_number[i_index-1];
1302                     /* new i_sample is less than old so i_chunk can only decreased */
1303                     while( i_chunk > 0 &&
1304                             i_sample < p_track->chunk[i_chunk].i_sample_first )
1305                     {
1306                         i_chunk--;
1307                     }
1308                 }
1309                 else
1310                 {
1311                     msg_Dbg( p_input, "stts gives %d --> %d (sample number)",
1312                             i_sample,
1313                             p_stss->data.p_stss->i_sample_number[i_index] );
1314                     i_sample = p_stss->data.p_stss->i_sample_number[i_index];
1315                     /* new i_sample is more than old so i_chunk can only increased */
1316                     while( i_chunk < p_track->i_chunk_count - 1 &&
1317                            i_sample >= p_track->chunk[i_chunk].i_sample_first +
1318                                                 p_track->chunk[i_chunk].i_sample_count )
1319                     {
1320                         i_chunk++;
1321                     }
1322                 }
1323                 break;
1324             }
1325         }
1326     }
1327     else
1328     {
1329         msg_Dbg( p_input,
1330                     "track[Id 0x%x] does not provide Sync Sample Box (stss)",
1331                     p_track->i_track_ID );
1332     }
1333
1334     *pi_chunk  = i_chunk;
1335     *pi_sample = i_sample;
1336
1337     return VLC_SUCCESS;
1338 }
1339
1340 static int  TrackGotoChunkSample( input_thread_t   *p_input,
1341                                   mp4_track_t *p_track,
1342                                   unsigned int     i_chunk,
1343                                   unsigned int     i_sample )
1344 {
1345     vlc_bool_t b_reselect = VLC_FALSE;
1346
1347     /* now see if actual es is ok */
1348     if( p_track->i_chunk < 0 ||
1349         p_track->i_chunk >= p_track->i_chunk_count ||
1350         p_track->chunk[p_track->i_chunk].i_sample_description_index !=
1351             p_track->chunk[i_chunk].i_sample_description_index )
1352     {
1353         msg_Warn( p_input, "recreate ES" );
1354
1355         es_out_Control( p_input->p_es_out, ES_OUT_GET_ES_STATE, p_track->p_es, &b_reselect );
1356
1357         es_out_Del( p_input->p_es_out, p_track->p_es );
1358
1359         p_track->p_es = NULL;
1360
1361         if( TrackCreateES( p_input,
1362                            p_track, i_chunk,
1363                            &p_track->p_es ) )
1364         {
1365             msg_Err( p_input, "cannot create es for track[Id 0x%x]",
1366                      p_track->i_track_ID );
1367
1368             p_track->b_ok       = VLC_FALSE;
1369             p_track->b_selected = VLC_FALSE;
1370             return VLC_EGENERIC;
1371         }
1372     }
1373
1374     /* select again the new decoder */
1375     if( b_reselect )
1376     {
1377         es_out_Control( p_input->p_es_out, ES_OUT_SET_ES, p_track->p_es );
1378     }
1379
1380     p_track->i_chunk    = i_chunk;
1381     p_track->i_sample   = i_sample;
1382
1383     return p_track->b_selected ? VLC_SUCCESS : VLC_EGENERIC;
1384 }
1385
1386 /****************************************************************************
1387  * MP4_TrackCreate:
1388  ****************************************************************************
1389  * Parse track information and create all needed data to run a track
1390  * If it succeed b_ok is set to 1 else to 0
1391  ****************************************************************************/
1392 static void MP4_TrackCreate( input_thread_t *p_input,
1393                              mp4_track_t *p_track,
1394                              MP4_Box_t  * p_box_trak )
1395 {
1396     demux_sys_t *p_sys = p_input->p_demux_data;
1397
1398     MP4_Box_t *p_tkhd = MP4_BoxGet( p_box_trak, "tkhd" );
1399     MP4_Box_t *p_tref = MP4_BoxGet( p_box_trak, "tref" );
1400     MP4_Box_t *p_elst;
1401
1402     MP4_Box_t *p_mdhd;
1403     MP4_Box_t *p_hdlr;
1404
1405     MP4_Box_t *p_vmhd;
1406     MP4_Box_t *p_smhd;
1407
1408     MP4_Box_t *p_drms;
1409
1410     unsigned int i;
1411     char language[4];
1412
1413     /* hint track unsuported */
1414
1415     /* set default value (-> track unusable) */
1416     p_track->b_ok       = VLC_FALSE;
1417     p_track->b_enable   = VLC_FALSE;
1418     p_track->b_selected = VLC_FALSE;
1419
1420     es_format_Init( &p_track->fmt, UNKNOWN_ES, 0 );
1421
1422     if( !p_tkhd )
1423     {
1424         return;
1425     }
1426
1427     /* do we launch this track by default ? */
1428     p_track->b_enable =
1429         ( ( p_tkhd->data.p_tkhd->i_flags&MP4_TRACK_ENABLED ) != 0 );
1430
1431     p_track->i_track_ID = p_tkhd->data.p_tkhd->i_track_ID;
1432     p_track->i_width = p_tkhd->data.p_tkhd->i_width / 65536;
1433     p_track->i_height = p_tkhd->data.p_tkhd->i_height / 65536;
1434
1435     if( p_tref )
1436     {
1437 /*        msg_Warn( p_input, "unhandled box: tref --> FIXME" ); */
1438     }
1439
1440     p_mdhd = MP4_BoxGet( p_box_trak, "mdia/mdhd" );
1441     p_hdlr = MP4_BoxGet( p_box_trak, "mdia/hdlr" );
1442
1443     if( ( !p_mdhd )||( !p_hdlr ) )
1444     {
1445         return;
1446     }
1447
1448     p_track->i_timescale = p_mdhd->data.p_mdhd->i_timescale;
1449
1450     for( i = 0; i < 3; i++ )
1451     {
1452         language[i] = p_mdhd->data.p_mdhd->i_language[i];
1453     }
1454     language[3] = '\0';
1455
1456     switch( p_hdlr->data.p_hdlr->i_handler_type )
1457     {
1458         case( FOURCC_soun ):
1459             if( !( p_smhd = MP4_BoxGet( p_box_trak, "mdia/minf/smhd" ) ) )
1460             {
1461                 return;
1462             }
1463             p_track->fmt.i_cat = AUDIO_ES;
1464             break;
1465
1466         case( FOURCC_vide ):
1467             if( !( p_vmhd = MP4_BoxGet( p_box_trak, "mdia/minf/vmhd" ) ) )
1468             {
1469                 return;
1470             }
1471             p_track->fmt.i_cat = VIDEO_ES;
1472             break;
1473
1474         default:
1475             return;
1476     }
1477
1478     p_track->i_elst = 0;
1479     p_track->i_elst_time = 0;
1480     if( ( p_track->p_elst = p_elst = MP4_BoxGet( p_box_trak, "edts/elst" ) ) )
1481     {
1482         MP4_Box_data_elst_t *elst = p_elst->data.p_elst;
1483         int i;
1484
1485         msg_Warn( p_input, "elst box found" );
1486         for( i = 0; i < elst->i_entry_count; i++ )
1487         {
1488             msg_Dbg( p_input, "   - [%d] duration="I64Fd"ms media time="I64Fd"ms) rate=%d.%d",
1489                      i,
1490                      elst->i_segment_duration[i] * 1000 / p_sys->i_timescale,
1491                      elst->i_media_time[i] >= 0 ?
1492                         elst->i_media_time[i] * 1000 / p_track->i_timescale : -1,
1493                      elst->i_media_rate_integer[i],
1494                      elst->i_media_rate_fraction[i] );
1495         }
1496     }
1497
1498
1499 /*  TODO
1500     add support for:
1501     p_dinf = MP4_BoxGet( p_minf, "dinf" );
1502 */
1503     if( !( p_track->p_stbl = MP4_BoxGet( p_box_trak,"mdia/minf/stbl" ) ) ||
1504         !( p_track->p_stsd = MP4_BoxGet( p_box_trak,"mdia/minf/stbl/stsd") ) )
1505     {
1506         return;
1507     }
1508
1509     p_drms = MP4_BoxGet( p_track->p_stsd, "drms" );
1510     p_track->b_drms = p_drms != NULL;
1511     p_track->p_drms = p_track->b_drms ?
1512         p_drms->data.p_sample_soun->p_drms : NULL;
1513
1514     /* Set language */
1515     if( strcmp( language, "```" ) && strcmp( language, "und" ) )
1516     {
1517         p_track->fmt.psz_language = strdup( language );
1518     }
1519
1520     /* fxi i_timescale for AUDIO_ES with i_qt_version == 0 */
1521     if( p_track->fmt.i_cat == AUDIO_ES ) //&& p_track->i_sample_size == 1 )
1522     {
1523         MP4_Box_t *p_sample;
1524
1525         p_sample = MP4_BoxGet(  p_track->p_stsd, "[0]" );
1526         if( p_sample && p_sample->data.p_sample_soun)
1527         {
1528             MP4_Box_data_sample_soun_t *p_soun = p_sample->data.p_sample_soun;
1529             if( p_soun->i_qt_version == 0 &&
1530                 p_track->i_timescale != p_soun->i_sampleratehi )
1531             {
1532                 msg_Warn( p_input,
1533                           "i_timescale ("I64Fu") != i_sampleratehi (%u) with "
1534                           "qt_version == 0\n"
1535                           "Making both equal. (report any problem)",
1536                           p_track->i_timescale, p_soun->i_sampleratehi );
1537
1538                 if( p_soun->i_sampleratehi )
1539                     p_track->i_timescale = p_soun->i_sampleratehi;
1540                 else
1541                     p_soun->i_sampleratehi = p_track->i_timescale;
1542             }
1543         }
1544     }
1545
1546     /* Create chunk index table and sample index table */
1547     if( TrackCreateChunksIndex( p_input,p_track  ) ||
1548         TrackCreateSamplesIndex( p_input, p_track ) )
1549     {
1550         return; /* cannot create chunks index */
1551     }
1552
1553     p_track->i_chunk  = 0;
1554     p_track->i_sample = 0;
1555
1556     /* now create es */
1557     if( TrackCreateES( p_input,
1558                        p_track, p_track->i_chunk,
1559                        &p_track->p_es ) )
1560     {
1561         msg_Err( p_input, "cannot create es for track[Id 0x%x]",
1562                  p_track->i_track_ID );
1563         return;
1564     }
1565
1566 #if 0
1567     {
1568         int i;
1569         for( i = 0; i < p_track->i_chunk_count; i++ )
1570         {
1571             fprintf( stderr, "%-5d sample_count=%d pts=%lld\n", i, p_track->chunk[i].i_sample_count, p_track->chunk[i].i_first_dts );
1572
1573         }
1574     }
1575 #endif
1576     p_track->b_ok = VLC_TRUE;
1577 }
1578
1579 /****************************************************************************
1580  * MP4_TrackDestroy:
1581  ****************************************************************************
1582  * Destroy a track created by MP4_TrackCreate.
1583  ****************************************************************************/
1584 static void MP4_TrackDestroy( input_thread_t *p_input,
1585                               mp4_track_t *p_track )
1586 {
1587     unsigned int i_chunk;
1588
1589     p_track->b_ok = VLC_FALSE;
1590     p_track->b_enable   = VLC_FALSE;
1591     p_track->b_selected = VLC_FALSE;
1592
1593     es_format_Init( &p_track->fmt, UNKNOWN_ES, 0 );
1594
1595     for( i_chunk = 0; i_chunk < p_track->i_chunk_count; i_chunk++ )
1596     {
1597         if( p_track->chunk )
1598         {
1599            FREE(p_track->chunk[i_chunk].p_sample_count_dts);
1600            FREE(p_track->chunk[i_chunk].p_sample_delta_dts );
1601         }
1602     }
1603     FREE( p_track->chunk );
1604
1605     if( !p_track->i_sample_size )
1606     {
1607         FREE( p_track->p_sample_size );
1608     }
1609 }
1610
1611 static int  MP4_TrackSelect ( input_thread_t    *p_input,
1612                               mp4_track_t  *p_track,
1613                               mtime_t           i_start )
1614 {
1615     if( !p_track->b_ok )
1616     {
1617         return VLC_EGENERIC;
1618     }
1619
1620     if( p_track->b_selected )
1621     {
1622         msg_Warn( p_input,
1623                   "track[Id 0x%x] already selected",
1624                   p_track->i_track_ID );
1625         return VLC_SUCCESS;
1626     }
1627
1628     return MP4_TrackSeek( p_input, p_track, i_start );
1629 }
1630
1631 static void MP4_TrackUnselect(input_thread_t    *p_input,
1632                               mp4_track_t  *p_track )
1633 {
1634     if( !p_track->b_ok )
1635     {
1636         return;
1637     }
1638
1639     if( !p_track->b_selected )
1640     {
1641         msg_Warn( p_input,
1642                   "track[Id 0x%x] already unselected",
1643                   p_track->i_track_ID );
1644         return;
1645     }
1646     if( p_track->p_es )
1647     {
1648         es_out_Control( p_input->p_es_out, ES_OUT_SET_ES_STATE, p_track->p_es, VLC_FALSE );
1649     }
1650
1651     p_track->b_selected = VLC_FALSE;
1652 }
1653
1654 static int  MP4_TrackSeek   ( input_thread_t    *p_input,
1655                               mp4_track_t  *p_track,
1656                               mtime_t           i_start )
1657 {
1658     uint32_t i_chunk;
1659     uint32_t i_sample;
1660
1661     if( !p_track->b_ok )
1662     {
1663         return( VLC_EGENERIC );
1664     }
1665
1666     if( TrackTimeToSampleChunk( p_input,
1667                                 p_track, i_start,
1668                                 &i_chunk, &i_sample ) )
1669     {
1670         msg_Warn( p_input,
1671                   "cannot select track[Id 0x%x]",
1672                   p_track->i_track_ID );
1673         return( VLC_EGENERIC );
1674     }
1675
1676     p_track->b_selected = VLC_TRUE;
1677
1678     if( TrackGotoChunkSample( p_input, p_track, i_chunk, i_sample ) )
1679     {
1680         p_track->b_selected = VLC_FALSE;
1681     }
1682     return( p_track->b_selected ? VLC_SUCCESS : VLC_EGENERIC );
1683 }
1684
1685
1686 /*
1687  * 3 types: for audio
1688  *
1689  */
1690 #define QT_V0_MAX_SAMPLES    1500
1691 static int  MP4_TrackSampleSize( mp4_track_t   *p_track )
1692 {
1693     int i_size;
1694     MP4_Box_data_sample_soun_t *p_soun;
1695
1696     if( p_track->i_sample_size == 0 )
1697     {
1698         /* most simple case */
1699         return( p_track->p_sample_size[p_track->i_sample] );
1700     }
1701     if( p_track->fmt.i_cat != AUDIO_ES )
1702     {
1703         return( p_track->i_sample_size );
1704     }
1705
1706     if( p_track->i_sample_size != 1 )
1707     {
1708         //msg_Warn( p_input, "SampleSize != 1" );
1709         return( p_track->i_sample_size );
1710     }
1711
1712     p_soun = p_track->p_sample->data.p_sample_soun;
1713
1714     if( p_soun->i_qt_version == 1 )
1715     {
1716         i_size = p_track->chunk[p_track->i_chunk].i_sample_count / p_soun->i_sample_per_packet * p_soun->i_bytes_per_frame;
1717     }
1718     else
1719     {
1720         /* FIXME */
1721         int i_samples = p_track->chunk[p_track->i_chunk].i_sample_count -
1722                 ( p_track->i_sample - p_track->chunk[p_track->i_chunk].i_sample_first );
1723         if( i_samples > QT_V0_MAX_SAMPLES )
1724         {
1725             i_samples = QT_V0_MAX_SAMPLES;
1726         }
1727         i_size = i_samples * p_soun->i_channelcount * p_soun->i_samplesize / 8;
1728     }
1729
1730     //fprintf( stderr, "size=%d\n", i_size );
1731     return( i_size );
1732 }
1733
1734
1735 static uint64_t MP4_TrackGetPos( mp4_track_t *p_track )
1736 {
1737     unsigned int i_sample;
1738     uint64_t i_pos;
1739
1740
1741     i_pos = p_track->chunk[p_track->i_chunk].i_offset;
1742
1743     if( p_track->i_sample_size )
1744     {
1745         MP4_Box_data_sample_soun_t *p_soun = p_track->p_sample->data.p_sample_soun;
1746
1747         if( p_soun->i_qt_version == 0 )
1748         {
1749             i_pos += ( p_track->i_sample - p_track->chunk[p_track->i_chunk].i_sample_first ) *
1750                         p_soun->i_channelcount * p_soun->i_samplesize / 8;
1751         }
1752         else
1753         {
1754             /* we read chunk by chunk */
1755             i_pos += 0;
1756         }
1757     }
1758     else
1759     {
1760         for( i_sample = p_track->chunk[p_track->i_chunk].i_sample_first;
1761                 i_sample < p_track->i_sample; i_sample++ )
1762         {
1763             i_pos += p_track->p_sample_size[i_sample];
1764         }
1765
1766     }
1767     return( i_pos );
1768 }
1769
1770 static int  MP4_TrackNextSample( input_thread_t     *p_input,
1771                                  mp4_track_t   *p_track )
1772 {
1773
1774     if( p_track->fmt.i_cat == AUDIO_ES &&
1775         p_track->i_sample_size != 0 )
1776     {
1777         MP4_Box_data_sample_soun_t *p_soun;
1778
1779         p_soun = p_track->p_sample->data.p_sample_soun;
1780
1781         if( p_soun->i_qt_version == 1 )
1782         {
1783             /* chunk by chunk */
1784             p_track->i_sample =
1785                 p_track->chunk[p_track->i_chunk].i_sample_first +
1786                 p_track->chunk[p_track->i_chunk].i_sample_count;
1787         }
1788         else
1789         {
1790             /* FIXME */
1791             p_track->i_sample += QT_V0_MAX_SAMPLES;
1792             if( p_track->i_sample > p_track->chunk[p_track->i_chunk].i_sample_first + p_track->chunk[p_track->i_chunk].i_sample_count )
1793             {
1794                 p_track->i_sample =
1795                     p_track->chunk[p_track->i_chunk].i_sample_first +
1796                     p_track->chunk[p_track->i_chunk].i_sample_count;
1797             }
1798         }
1799     }
1800     else
1801     {
1802         p_track->i_sample++;
1803     }
1804
1805     if( p_track->i_sample >= p_track->i_sample_count )
1806     {
1807         /* we have reach end of the track so free decoder stuff */
1808         msg_Warn( p_input, "track[0x%x] will be disabled", p_track->i_track_ID );
1809         MP4_TrackUnselect( p_input, p_track );
1810         return VLC_EGENERIC;
1811     }
1812
1813     /* Have we changed chunk ? */
1814     if( p_track->i_sample >=
1815             p_track->chunk[p_track->i_chunk].i_sample_first +
1816             p_track->chunk[p_track->i_chunk].i_sample_count )
1817     {
1818         if( TrackGotoChunkSample( p_input,
1819                                   p_track,
1820                                   p_track->i_chunk + 1,
1821                                   p_track->i_sample ) )
1822         {
1823             msg_Warn( p_input, "track[0x%x] will be disabled (cannot restart decoder)", p_track->i_track_ID );
1824             MP4_TrackUnselect( p_input, p_track );
1825             return VLC_EGENERIC;
1826         }
1827     }
1828
1829     /* Have we changed elst */
1830     if( p_track->p_elst && p_track->p_elst->data.p_elst->i_entry_count > 0 )
1831     {
1832         demux_sys_t *p_sys = p_input->p_demux_data;
1833         MP4_Box_data_elst_t *elst = p_track->p_elst->data.p_elst;
1834         int64_t i_mvt = MP4_TrackGetPTS( p_input, p_track ) * p_sys->i_timescale / (int64_t)1000000;
1835
1836         if( p_track->i_elst < elst->i_entry_count &&
1837             i_mvt >= p_track->i_elst_time + elst->i_segment_duration[p_track->i_elst] )
1838         {
1839             MP4_TrackSetELST( p_input, p_track, MP4_TrackGetPTS( p_input, p_track ) );
1840         }
1841     }
1842
1843     return VLC_SUCCESS;
1844 }
1845
1846 static void MP4_TrackSetELST( input_thread_t *p_input, mp4_track_t *tk, int64_t i_time )
1847 {
1848     demux_sys_t *p_sys = p_input->p_demux_data;
1849     int         i_elst_last = tk->i_elst;
1850
1851     /* handle elst (find the correct one) */
1852     tk->i_elst      = 0;
1853     tk->i_elst_time = 0;
1854     if( tk->p_elst && tk->p_elst->data.p_elst->i_entry_count > 0 )
1855     {
1856         MP4_Box_data_elst_t *elst = tk->p_elst->data.p_elst;
1857         int64_t i_mvt= i_time * p_sys->i_timescale / (int64_t)1000000;
1858
1859         for( tk->i_elst = 0; tk->i_elst < elst->i_entry_count; tk->i_elst++ )
1860         {
1861             mtime_t i_dur = elst->i_segment_duration[tk->i_elst];
1862
1863             if( tk->i_elst_time <= i_mvt && i_mvt < tk->i_elst_time + i_dur )
1864             {
1865                 break;
1866             }
1867             tk->i_elst_time += i_dur;
1868         }
1869
1870         if( tk->i_elst >= elst->i_entry_count )
1871         {
1872             /* msg_Dbg( p_input, "invalid number of entry in elst" ); */
1873             tk->i_elst = elst->i_entry_count - 1;
1874             tk->i_elst_time -= elst->i_segment_duration[tk->i_elst];
1875         }
1876
1877         if( elst->i_media_time[tk->i_elst] < 0 )
1878         {
1879             /* track offset */
1880             tk->i_elst_time += elst->i_segment_duration[tk->i_elst];
1881         }
1882     }
1883     if( i_elst_last != tk->i_elst )
1884     {
1885         msg_Warn( p_input, "elst old=%d new=%d", i_elst_last, tk->i_elst );
1886     }
1887 }
1888