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 the VideoLAN team
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33
  34
  35 #include <vlc_demux.h>
  36 #include <vlc_md5.h>
  37 #include <vlc_charset.h>
  38 #include <vlc_iso_lang.h>
  39 #include <vlc_meta.h>
  40 #include <vlc_input.h>
  41
  42 #include "libmp4.h"
  43 #include "drms.h"
  44
  45 #ifdef UNDER_CE
  46 #define uint64_t int64_t
  47 #endif
  48
  49 /*****************************************************************************
  50  * Module descriptor
  51  *****************************************************************************/
  52 static int  Open ( vlc_object_t * );
  53 static void Close( vlc_object_t * );
  54
  55 vlc_module_begin();
  56     set_category( CAT_INPUT );
  57     set_subcategory( SUBCAT_INPUT_DEMUX );
  58     set_description( N_("MP4 stream demuxer") );
  59     set_capability( "demux", 242 );
  60     set_callbacks( Open, Close );
  61 vlc_module_end();
  62
  63 /*****************************************************************************
  64  * Local prototypes
  65  *****************************************************************************/
  66 static int   Demux   ( demux_t * );
  67 static int   DemuxRef( demux_t *p_demux ){ (void)p_demux; return 0;}
  68 static int   Seek    ( demux_t *, mtime_t );
  69 static int   Control ( demux_t *, int, va_list );
  70
  71 /* Contain all information about a chunk */
  72 typedef struct
  73 {
  74     uint64_t     i_offset; /* absolute position of this chunk in the file */
  75     uint32_t     i_sample_description_index; /* index for SampleEntry to use */
  76     uint32_t     i_sample_count; /* how many samples in this chunk */
  77     uint32_t     i_sample_first; /* index of the first sample in this chunk */
  78
  79     /* now provide way to calculate pts, dts, and offset without to
  80         much memory and with fast acces */
  81
  82     /* with this we can calculate dts/pts without waste memory */
  83     uint64_t     i_first_dts;
  84     uint32_t     *p_sample_count_dts;
  85     uint32_t     *p_sample_delta_dts;   /* dts delta */
  86
  87     uint32_t     *p_sample_count_pts;
  88     int32_t      *p_sample_offset_pts;  /* pts-dts */
  89
  90     /* TODO if needed add pts
  91         but quickly *add* support for edts and seeking */
  92
  93 } mp4_chunk_t;
  94
  95  /* Contain all needed information for read all track with vlc */
  96 typedef struct
  97 {
  98     unsigned int i_track_ID;/* this should be unique */
  99
 100     int b_ok;               /* The track is usable */
 101     int b_enable;           /* is the trak enable by default */
 102     bool b_selected;  /* is the trak being played */
 103     bool b_chapter;   /* True when used for chapter only */
 104
 105     es_format_t fmt;
 106     es_out_id_t *p_es;
 107
 108     /* display size only ! */
 109     int i_width;
 110     int i_height;
 111
 112     /* more internal data */
 113     uint64_t        i_timescale;    /* time scale for this track only */
 114
 115     /* elst */
 116     int             i_elst;         /* current elst */
 117     int64_t         i_elst_time;    /* current elst start time (in movie time scale)*/
 118     MP4_Box_t       *p_elst;        /* elst (could be NULL) */
 119
 120     /* give the next sample to read, i_chunk is to find quickly where
 121       the sample is located */
 122     uint32_t         i_sample;       /* next sample to read */
 123     uint32_t         i_chunk;        /* chunk where next sample is stored */
 124     /* total count of chunk and sample */
 125     uint32_t         i_chunk_count;
 126     uint32_t         i_sample_count;
 127
 128     mp4_chunk_t    *chunk; /* always defined  for each chunk */
 129
 130     /* sample size, p_sample_size defined only if i_sample_size == 0
 131         else i_sample_size is size for all sample */
 132     uint32_t         i_sample_size;
 133     uint32_t         *p_sample_size; /* XXX perhaps add file offset if take
 134                                     too much time to do sumations each time*/
 135
 136     MP4_Box_t *p_stbl;  /* will contain all timing information */
 137     MP4_Box_t *p_stsd;  /* will contain all data to initialize decoder */
 138     MP4_Box_t *p_sample;/* point on actual sdsd */
 139
 140     bool b_drms;
 141     void      *p_drms;
 142
 143 } mp4_track_t;
 144
 145
 146 struct demux_sys_t
 147 {
 148     MP4_Box_t    *p_root;      /* container for the whole file */
 149
 150     mtime_t      i_pcr;
 151
 152     uint64_t     i_time;         /* time position of the presentation
 153                                   * in movie timescale */
 154     uint64_t     i_timescale;    /* movie time scale */
 155     uint64_t     i_duration;     /* movie duration */
 156     unsigned int i_tracks;       /* number of tracks */
 157     mp4_track_t  *track;         /* array of track */
 158
 159     /* */
 160     MP4_Box_t    *p_tref_chap;
 161
 162     /* */
 163     input_title_t *p_title;
 164 };
 165
 166 /*****************************************************************************
 167  * Declaration of local function
 168  *****************************************************************************/
 169 static void MP4_TrackCreate ( demux_t *, mp4_track_t *, MP4_Box_t  *);
 170 static void MP4_TrackDestroy(  mp4_track_t * );
 171
 172 static int  MP4_TrackSelect ( demux_t *, mp4_track_t *, mtime_t );
 173 static void MP4_TrackUnselect(demux_t *, mp4_track_t * );
 174
 175 static int  MP4_TrackSeek   ( demux_t *, mp4_track_t *, mtime_t );
 176
 177 static uint64_t MP4_TrackGetPos    ( mp4_track_t * );
 178 static int      MP4_TrackSampleSize( mp4_track_t * );
 179 static int      MP4_TrackNextSample( demux_t *, mp4_track_t * );
 180 static void     MP4_TrackSetELST( demux_t *, mp4_track_t *, int64_t );
 181
 182 static void     MP4_UpdateSeekpoint( demux_t * );
 183
 184 /* Return time in s of a track */
 185 static inline int64_t MP4_TrackGetDTS( demux_t *p_demux, mp4_track_t *p_track )
 186 {
 187 #define chunk p_track->chunk[p_track->i_chunk]
 188
 189     unsigned int i_index = 0;
 190     unsigned int i_sample = p_track->i_sample - chunk.i_sample_first;
 191     int64_t i_dts = chunk.i_first_dts;
 192
 193     while( i_sample > 0 )
 194     {
 195         if( i_sample > chunk.p_sample_count_dts[i_index] )
 196         {
 197             i_dts += chunk.p_sample_count_dts[i_index] *
 198                 chunk.p_sample_delta_dts[i_index];
 199             i_sample -= chunk.p_sample_count_dts[i_index];
 200             i_index++;
 201         }
 202         else
 203         {
 204             i_dts += i_sample * chunk.p_sample_delta_dts[i_index];
 205             i_sample = 0;
 206             break;
 207         }
 208     }
 209
 210 #undef chunk
 211
 212     /* now handle elst */
 213     if( p_track->p_elst )
 214     {
 215         demux_sys_t         *p_sys = p_demux->p_sys;
 216         MP4_Box_data_elst_t *elst = p_track->p_elst->data.p_elst;
 217
 218         /* convert to offset */
 219         if( ( elst->i_media_rate_integer[p_track->i_elst] > 0 ||
 220               elst->i_media_rate_fraction[p_track->i_elst] > 0 ) &&
 221             elst->i_media_time[p_track->i_elst] > 0 )
 222         {
 223             i_dts -= elst->i_media_time[p_track->i_elst];
 224         }
 225
 226         /* add i_elst_time */
 227         i_dts += p_track->i_elst_time * p_track->i_timescale /
 228             p_sys->i_timescale;
 229
 230         if( i_dts < 0 ) i_dts = 0;
 231     }
 232
 233     return INT64_C(1000000) * i_dts / p_track->i_timescale;
 234 }
 235
 236 static inline int64_t MP4_TrackGetPTSDelta( mp4_track_t *p_track )
 237 {
 238     mp4_chunk_t *ck = &p_track->chunk[p_track->i_chunk];
 239     unsigned int i_index = 0;
 240     unsigned int i_sample = p_track->i_sample - ck->i_sample_first;
 241
 242     if( ck->p_sample_count_pts == NULL || ck->p_sample_offset_pts == NULL )
 243         return -1;
 244
 245     for( i_index = 0;; i_index++ )
 246     {
 247         if( i_sample < ck->p_sample_count_pts[i_index] )
 248             return ck->p_sample_offset_pts[i_index] * INT64_C(1000000) /
 249                    (int64_t)p_track->i_timescale;
 250
 251         i_sample -= ck->p_sample_count_pts[i_index];
 252     }
 253 }
 254
 255 static inline int64_t MP4_GetMoviePTS(demux_sys_t *p_sys )
 256 {
 257     return INT64_C(1000000) * p_sys->i_time / p_sys->i_timescale;
 258 }
 259
 260 static void LoadChapter( demux_t  *p_demux );
 261
 262 /*****************************************************************************
 263  * Open: check file and initializes MP4 structures
 264  *****************************************************************************/
 265 static int Open( vlc_object_t * p_this )
 266 {
 267     demux_t  *p_demux = (demux_t *)p_this;
 268     demux_sys_t     *p_sys;
 269
 270     const uint8_t   *p_peek;
 271
 272     MP4_Box_t       *p_ftyp;
 273     MP4_Box_t       *p_rmra;
 274     MP4_Box_t       *p_mvhd;
 275     MP4_Box_t       *p_trak;
 276
 277     unsigned int    i;
 278     bool      b_seekable;
 279
 280     /* A little test to see if it could be a mp4 */
 281     if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 ) return VLC_EGENERIC;
 282
 283     switch( VLC_FOURCC( p_peek[4], p_peek[5], p_peek[6], p_peek[7] ) )
 284     {
 285         case FOURCC_ftyp:
 286         case FOURCC_moov:
 287         case FOURCC_foov:
 288         case FOURCC_moof:
 289         case FOURCC_mdat:
 290         case FOURCC_udta:
 291         case FOURCC_free:
 292         case FOURCC_skip:
 293         case FOURCC_wide:
 294         case VLC_FOURCC( 'p', 'n', 'o', 't' ):
 295             break;
 296          default:
 297             return VLC_EGENERIC;
 298     }
 299
 300     /* I need to seek */
 301     stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_seekable );
 302     if( !b_seekable )
 303     {
 304         msg_Warn( p_demux, "MP4 plugin discarded (unseekable)" );
 305         return VLC_EGENERIC;
 306     }
 307
 308     /*Set exported functions */
 309     p_demux->pf_demux = Demux;
 310     p_demux->pf_control = Control;
 311
 312     /* create our structure that will contains all data */
 313     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 314     memset( p_sys, 0, sizeof( demux_sys_t ) );
 315
 316     /* Now load all boxes ( except raw data ) */
 317     if( ( p_sys->p_root = MP4_BoxGetRoot( p_demux->s ) ) == NULL )
 318     {
 319         msg_Warn( p_demux, "MP4 plugin discarded (not a valid file)" );
 320         goto error;
 321     }
 322
 323     MP4_BoxDumpStructure( p_demux->s, p_sys->p_root );
 324
 325     if( ( p_ftyp = MP4_BoxGet( p_sys->p_root, "/ftyp" ) ) )
 326     {
 327         switch( p_ftyp->data.p_ftyp->i_major_brand )
 328         {
 329             case( FOURCC_isom ):
 330                 msg_Dbg( p_demux,
 331                          "ISO Media file (isom) version %d.",
 332                          p_ftyp->data.p_ftyp->i_minor_version );
 333                 break;
 334             default:
 335                 msg_Dbg( p_demux,
 336                          "unrecognized major file specification (%4.4s).",
 337                           (char*)&p_ftyp->data.p_ftyp->i_major_brand );
 338                 break;
 339         }
 340     }
 341     else
 342     {
 343         msg_Dbg( p_demux, "file type box missing (assuming ISO Media file)" );
 344     }
 345
 346     /* the file need to have one moov box */
 347     if( MP4_BoxCount( p_sys->p_root, "/moov" ) <= 0 )
 348     {
 349         MP4_Box_t *p_foov = MP4_BoxGet( p_sys->p_root, "/foov" );
 350
 351         if( !p_foov )
 352         {
 353             msg_Err( p_demux, "MP4 plugin discarded (no moov box)" );
 354             goto error;
 355         }
 356         /* we have a free box as a moov, rename it */
 357         p_foov->i_type = FOURCC_moov;
 358     }
 359
 360     if( ( p_rmra = MP4_BoxGet( p_sys->p_root,  "/moov/rmra" ) ) )
 361     {
 362         int        i_count = MP4_BoxCount( p_rmra, "rmda" );
 363         int        i;
 364
 365         msg_Dbg( p_demux, "detected playlist mov file (%d ref)", i_count );
 366
 367         input_thread_t * p_input = vlc_object_find( p_demux, VLC_OBJECT_INPUT, FIND_PARENT );
 368         input_item_t * p_current = input_GetItem( p_input );
 369         p_current->i_type = ITEM_TYPE_PLAYLIST;
 370
 371         for( i = 0; i < i_count; i++ )
 372         {
 373             MP4_Box_t *p_rdrf = MP4_BoxGet( p_rmra, "rmda[%d]/rdrf", i );
 374             char      *psz_ref;
 375             uint32_t  i_ref_type;
 376
 377             if( !p_rdrf || !( psz_ref = strdup( p_rdrf->data.p_rdrf->psz_ref ) ) )
 378             {
 379                 continue;
 380             }
 381             i_ref_type = p_rdrf->data.p_rdrf->i_ref_type;
 382
 383             msg_Dbg( p_demux, "new ref=`%s' type=%4.4s",
 384                      psz_ref, (char*)&i_ref_type );
 385
 386             if( i_ref_type == VLC_FOURCC( 'u', 'r', 'l', ' ' ) )
 387             {
 388                 if( strstr( psz_ref, "qt5gateQT" ) )
 389                 {
 390                     msg_Dbg( p_demux, "ignoring pseudo ref =`%s'", psz_ref );
 391                     continue;
 392                 }
 393                 if( !strncmp( psz_ref, "http://", 7 ) ||
 394                     !strncmp( psz_ref, "rtsp://", 7 ) )
 395                 {
 396                     ;
 397                 }
 398                 else
 399                 {
 400                     char *psz_absolute;
 401                     char *psz_path = strdup( p_demux->psz_path );
 402                     char *end = strrchr( psz_path, '/' );
 403                     if( end ) end[1] = '\0';
 404                     else *psz_path = '\0';
 405
 406                     if( asprintf( &psz_absolute, "%s://%s%s",
 407                                   p_demux->psz_access, psz_path, psz_ref ) < 0 )
 408                         return VLC_ENOMEM;
 409
 410                     free( psz_ref );
 411                     psz_ref = psz_absolute;
 412                     free( psz_path );
 413                 }
 414                 input_item_t *p_input;
 415                 msg_Dbg( p_demux, "adding ref = `%s'", psz_ref );
 416                 p_input = input_ItemNewExt( p_demux, psz_ref, NULL,
 417                                     0, NULL, -1 );
 418                 input_ItemCopyOptions( p_current, p_input );
 419                 input_ItemAddSubItem( p_current, p_input );
 420                 vlc_gc_decref( p_input );
 421             }
 422             else
 423             {
 424                 msg_Err( p_demux, "unknown ref type=%4.4s FIXME (send a bug report)",
 425                          (char*)&p_rdrf->data.p_rdrf->i_ref_type );
 426             }
 427             free( psz_ref );
 428         }
 429         vlc_object_release( p_input );
 430     }
 431
 432     if( !(p_mvhd = MP4_BoxGet( p_sys->p_root, "/moov/mvhd" ) ) )
 433     {
 434         if( !p_rmra )
 435         {
 436             msg_Err( p_demux, "cannot find /moov/mvhd" );
 437             goto error;
 438         }
 439         else
 440         {
 441             msg_Warn( p_demux, "cannot find /moov/mvhd (pure ref file)" );
 442             p_demux->pf_demux = DemuxRef;
 443             return VLC_SUCCESS;
 444         }
 445     }
 446     else
 447     {
 448         p_sys->i_timescale = p_mvhd->data.p_mvhd->i_timescale;
 449         if( p_sys->i_timescale == 0 )
 450         {
 451             msg_Err( p_this, "bad timescale" );
 452             goto error;
 453         }
 454         p_sys->i_duration = p_mvhd->data.p_mvhd->i_duration;
 455     }
 456
 457     if( !( p_sys->i_tracks = MP4_BoxCount( p_sys->p_root, "/moov/trak" ) ) )
 458     {
 459         msg_Err( p_demux, "cannot find any /moov/trak" );
 460         goto error;
 461     }
 462     msg_Dbg( p_demux, "found %d track%c",
 463                         p_sys->i_tracks,
 464                         p_sys->i_tracks ? 's':' ' );
 465
 466     /* allocate memory */
 467     p_sys->track = calloc( p_sys->i_tracks, sizeof( mp4_track_t ) );
 468     if( p_sys->track == NULL )
 469         goto error;
 470     memset( p_sys->track, 0, p_sys->i_tracks * sizeof( mp4_track_t ) );
 471
 472     /* Search the first chap reference (like quicktime) */
 473     p_sys->p_tref_chap = NULL;
 474     for( i = 0; i < p_sys->i_tracks; i++ )
 475     {
 476         MP4_Box_t *p_trak = MP4_BoxGet( p_sys->p_root, "/moov/trak[%d]", i );
 477         MP4_Box_t *p_chap = MP4_BoxGet( p_trak, "tref/chap", i );
 478         if( !p_chap || p_chap->data.p_tref_generic->i_entry_count <= 0 )
 479             continue;
 480
 481         p_sys->p_tref_chap = p_chap;
 482         break;
 483     }
 484
 485     /* now process each track and extract all usefull information */
 486     for( i = 0; i < p_sys->i_tracks; i++ )
 487     {
 488         p_trak = MP4_BoxGet( p_sys->p_root, "/moov/trak[%d]", i );
 489         MP4_TrackCreate( p_demux, &p_sys->track[i], p_trak );
 490
 491         if( p_sys->track[i].b_ok && !p_sys->track[i].b_chapter )
 492         {
 493             const char *psz_cat;
 494             switch( p_sys->track[i].fmt.i_cat )
 495             {
 496                 case( VIDEO_ES ):
 497                     psz_cat = "video";
 498                     break;
 499                 case( AUDIO_ES ):
 500                     psz_cat = "audio";
 501                     break;
 502                 case( SPU_ES ):
 503                     psz_cat = "subtitle";
 504                     break;
 505
 506                 default:
 507                     psz_cat = "unknown";
 508                     break;
 509             }
 510
 511             msg_Dbg( p_demux, "adding track[Id 0x%x] %s (%s) language %s",
 512                      p_sys->track[i].i_track_ID, psz_cat,
 513                      p_sys->track[i].b_enable ? "enable":"disable",
 514                      p_sys->track[i].fmt.psz_language ?
 515                      p_sys->track[i].fmt.psz_language : "undef" );
 516         }
 517         else if( p_sys->track[i].b_ok && p_sys->track[i].b_chapter )
 518         {
 519             msg_Dbg( p_demux, "using track[Id 0x%x] for chapter language %s",
 520                      p_sys->track[i].i_track_ID,
 521                      p_sys->track[i].fmt.psz_language ?
 522                      p_sys->track[i].fmt.psz_language : "undef" );
 523         }
 524         else
 525         {
 526             msg_Dbg( p_demux, "ignoring track[Id 0x%x]",
 527                      p_sys->track[i].i_track_ID );
 528         }
 529     }
 530
 531     /* */
 532     LoadChapter( p_demux );
 533
 534     return VLC_SUCCESS;
 535
 536 error:
 537     if( p_sys->p_root )
 538     {
 539         MP4_BoxFree( p_demux->s, p_sys->p_root );
 540     }
 541     free( p_sys );
 542     return VLC_EGENERIC;
 543 }
 544
 545 /*****************************************************************************
 546  * Demux: read packet and send them to decoders
 547  *****************************************************************************
 548  * TODO check for newly selected track (ie audio upt to now )
 549  *****************************************************************************/
 550 static int Demux( demux_t *p_demux )
 551 {
 552     demux_sys_t *p_sys = p_demux->p_sys;
 553     unsigned int i_track;
 554
 555
 556     unsigned int i_track_selected;
 557
 558     /* check for newly selected/unselected track */
 559     for( i_track = 0, i_track_selected = 0; i_track < p_sys->i_tracks;
 560          i_track++ )
 561     {
 562         mp4_track_t *tk = &p_sys->track[i_track];
 563         bool b;
 564
 565         if( !tk->b_ok || tk->b_chapter ||
 566             ( tk->b_selected && tk->i_sample >= tk->i_sample_count ) )
 567         {
 568             continue;
 569         }
 570
 571         es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE, tk->p_es, &b );
 572
 573         if( tk->b_selected && !b )
 574         {
 575             MP4_TrackUnselect( p_demux, tk );
 576         }
 577         else if( !tk->b_selected && b)
 578         {
 579             MP4_TrackSelect( p_demux, tk, MP4_GetMoviePTS( p_sys ) );
 580         }
 581
 582         if( tk->b_selected )
 583         {
 584             i_track_selected++;
 585         }
 586     }
 587
 588     if( i_track_selected <= 0 )
 589     {
 590         p_sys->i_time += __MAX( p_sys->i_timescale / 10 , 1 );
 591         if( p_sys->i_timescale > 0 )
 592         {
 593             int64_t i_length = (mtime_t)1000000 *
 594                                (mtime_t)p_sys->i_duration /
 595                                (mtime_t)p_sys->i_timescale;
 596             if( MP4_GetMoviePTS( p_sys ) >= i_length )
 597                 return 0;
 598             return 1;
 599         }
 600
 601         msg_Warn( p_demux, "no track selected, exiting..." );
 602         return 0;
 603     }
 604
 605     /* */
 606     MP4_UpdateSeekpoint( p_demux );
 607
 608     /* first wait for the good time to read a packet */
 609     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr + 1 );
 610
 611     p_sys->i_pcr = MP4_GetMoviePTS( p_sys );
 612
 613     /* we will read 100ms for each stream so ...*/
 614     p_sys->i_time += __MAX( p_sys->i_timescale / 10 , 1 );
 615
 616     for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
 617     {
 618         mp4_track_t *tk = &p_sys->track[i_track];
 619
 620         if( !tk->b_ok || tk->b_chapter || !tk->b_selected || tk->i_sample >= tk->i_sample_count )
 621             continue;
 622
 623         while( MP4_TrackGetDTS( p_demux, tk ) < MP4_GetMoviePTS( p_sys ) )
 624         {
 625 #if 0
 626             msg_Dbg( p_demux, "tk(%i)=%lld mv=%lld", i_track,
 627                      MP4_TrackGetDTS( p_demux, tk ),
 628                      MP4_GetMoviePTS( p_sys ) );
 629 #endif
 630
 631             if( MP4_TrackSampleSize( tk ) > 0 )
 632             {
 633                 block_t *p_block;
 634                 int64_t i_delta;
 635
 636                 /* go,go go ! */
 637                 if( stream_Seek( p_demux->s, MP4_TrackGetPos( tk ) ) )
 638                 {
 639                     msg_Warn( p_demux, "track[0x%x] will be disabled (eof?)",
 640                               tk->i_track_ID );
 641                     MP4_TrackUnselect( p_demux, tk );
 642                     break;
 643                 }
 644
 645                 /* now read pes */
 646                 if( !(p_block =
 647                          stream_Block( p_demux->s, MP4_TrackSampleSize(tk) )) )
 648                 {
 649                     msg_Warn( p_demux, "track[0x%x] will be disabled (eof?)",
 650                               tk->i_track_ID );
 651                     MP4_TrackUnselect( p_demux, tk );
 652                     break;
 653                 }
 654
 655                 if( tk->b_drms && tk->p_drms )
 656                 {
 657                     drms_decrypt( tk->p_drms, (uint32_t*)p_block->p_buffer,
 658                                   p_block->i_buffer );
 659                 }
 660                 else if( tk->fmt.i_cat == SPU_ES )
 661                 {
 662                     if( tk->fmt.i_codec == VLC_FOURCC( 's', 'u', 'b', 't' ) &&
 663                         p_block->i_buffer >= 2 )
 664                     {
 665                         uint16_t i_size = GetWBE( p_block->p_buffer );
 666
 667                         if( i_size + 2 <= p_block->i_buffer )
 668                         {
 669                             char *p;
 670                             /* remove the length field, and append a '\0' */
 671                             memmove( &p_block->p_buffer[0],
 672                                      &p_block->p_buffer[2], i_size );
 673                             p_block->p_buffer[i_size] = '\0';
 674                             p_block->i_buffer = i_size + 1;
 675
 676                             /* convert \r -> \n */
 677                             while( ( p = strchr((char *) p_block->p_buffer, '\r' ) ) )
 678                             {
 679                                 *p = '\n';
 680                             }
 681                         }
 682                         else
 683                         {
 684                             /* Invalid */
 685                             p_block->i_buffer = 0;
 686                         }
 687                     }
 688                 }
 689                 /* dts */
 690                 p_block->i_dts = MP4_TrackGetDTS( p_demux, tk ) + 1;
 691                 /* pts */
 692                 i_delta = MP4_TrackGetPTSDelta( tk );
 693                 if( i_delta != -1 )
 694                     p_block->i_pts = p_block->i_dts + i_delta;
 695                 else if( tk->fmt.i_cat != VIDEO_ES )
 696                     p_block->i_pts = p_block->i_dts;
 697                 else
 698                     p_block->i_pts = 0;
 699
 700                 if( !tk->b_drms || ( tk->b_drms && tk->p_drms ) )
 701                     es_out_Send( p_demux->out, tk->p_es, p_block );
 702             }
 703
 704             /* Next sample */
 705             if( MP4_TrackNextSample( p_demux, tk ) )
 706                 break;
 707         }
 708     }
 709
 710     return 1;
 711 }
 712
 713 static void MP4_UpdateSeekpoint( demux_t *p_demux )
 714 {
 715     demux_sys_t *p_sys = p_demux->p_sys;
 716     int64_t i_time;
 717     int i;
 718     if( !p_sys->p_title )
 719         return;
 720     i_time = MP4_GetMoviePTS( p_sys );
 721     for( i = 0; i < p_sys->p_title->i_seekpoint; i++ )
 722     {
 723         if( i_time < p_sys->p_title->seekpoint[i]->i_time_offset )
 724             break;
 725     }
 726     i--;
 727
 728     if( i != p_demux->info.i_seekpoint && i >= 0 )
 729     {
 730         p_demux->info.i_seekpoint = i;
 731         p_demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
 732     }
 733 }
 734 /*****************************************************************************
 735  * Seek: Got to i_date
 736 ******************************************************************************/
 737 static int Seek( demux_t *p_demux, mtime_t i_date )
 738 {
 739     demux_sys_t *p_sys = p_demux->p_sys;
 740     unsigned int i_track;
 741
 742     /* First update update global time */
 743     p_sys->i_time = i_date * p_sys->i_timescale / 1000000;
 744     p_sys->i_pcr  = i_date;
 745
 746     /* Now for each stream try to go to this time */
 747     for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
 748     {
 749         mp4_track_t *tk = &p_sys->track[i_track];
 750         MP4_TrackSeek( p_demux, tk, i_date );
 751     }
 752     MP4_UpdateSeekpoint( p_demux );
 753     return VLC_SUCCESS;
 754 }
 755
 756 /*****************************************************************************
 757  * Control:
 758  *****************************************************************************/
 759 static int Control( demux_t *p_demux, int i_query, va_list args )
 760 {
 761     demux_sys_t *p_sys = p_demux->p_sys;
 762
 763     double f, *pf;
 764     int64_t i64, *pi64;
 765
 766     switch( i_query )
 767     {
 768         case DEMUX_GET_POSITION:
 769             pf = (double*)va_arg( args, double * );
 770             if( p_sys->i_duration > 0 )
 771             {
 772                 *pf = (double)p_sys->i_time / (double)p_sys->i_duration;
 773             }
 774             else
 775             {
 776                 *pf = 0.0;
 777             }
 778             return VLC_SUCCESS;
 779
 780         case DEMUX_SET_POSITION:
 781             f = (double)va_arg( args, double );
 782             if( p_sys->i_timescale > 0 )
 783             {
 784                 i64 = (int64_t)( f * (double)1000000 *
 785                                  (double)p_sys->i_duration /
 786                                  (double)p_sys->i_timescale );
 787                 return Seek( p_demux, i64 );
 788             }
 789             else return VLC_SUCCESS;
 790
 791         case DEMUX_GET_TIME:
 792             pi64 = (int64_t*)va_arg( args, int64_t * );
 793             if( p_sys->i_timescale > 0 )
 794             {
 795                 *pi64 = (mtime_t)1000000 *
 796                         (mtime_t)p_sys->i_time /
 797                         (mtime_t)p_sys->i_timescale;
 798             }
 799             else *pi64 = 0;
 800             return VLC_SUCCESS;
 801
 802         case DEMUX_SET_TIME:
 803             i64 = (int64_t)va_arg( args, int64_t );
 804             return Seek( p_demux, i64 );
 805
 806         case DEMUX_GET_LENGTH:
 807             pi64 = (int64_t*)va_arg( args, int64_t * );
 808             if( p_sys->i_timescale > 0 )
 809             {
 810                 *pi64 = (mtime_t)1000000 *
 811                         (mtime_t)p_sys->i_duration /
 812                         (mtime_t)p_sys->i_timescale;
 813             }
 814             else *pi64 = 0;
 815             return VLC_SUCCESS;
 816
 817         case DEMUX_GET_FPS:
 818             msg_Warn( p_demux, "DEMUX_GET_FPS unimplemented !!" );
 819             return VLC_EGENERIC;
 820
 821         case DEMUX_GET_META:
 822         {
 823             vlc_meta_t *p_meta = (vlc_meta_t *)va_arg( args, vlc_meta_t*);
 824             MP4_Box_t  *p_0xa9xxx;
 825
 826             MP4_Box_t  *p_udta = MP4_BoxGet( p_sys->p_root, "/moov/udta/meta/ilst" );
 827             if( p_udta == NULL )
 828             {
 829                 p_udta = MP4_BoxGet( p_sys->p_root, "/moov/udta" );
 830                 if( p_udta == NULL )
 831                 {
 832                     return VLC_EGENERIC;
 833                 }
 834             }
 835
 836             for( p_0xa9xxx = p_udta->p_first; p_0xa9xxx != NULL;
 837                  p_0xa9xxx = p_0xa9xxx->p_next )
 838             {
 839
 840                 if( !p_0xa9xxx || !p_0xa9xxx->data.p_0xa9xxx )
 841                     continue;
 842
 843                 /* FIXME FIXME: should convert from whatever the character
 844                  * encoding of MP4 meta data is to UTF-8. */
 845 #define SET(fct) do { char *psz_utf = strdup( p_0xa9xxx->data.p_0xa9xxx->psz_text ? p_0xa9xxx->data.p_0xa9xxx->psz_text : "" ); \
 846     if( psz_utf ) { EnsureUTF8( psz_utf );  \
 847                     fct( p_meta, psz_utf ); free( psz_utf ); } } while(0)
 848
 849                 /* XXX Becarefull p_udta can have box that are not 0xa9xx */
 850                 switch( p_0xa9xxx->i_type )
 851                 {
 852                 case FOURCC_0xa9nam: /* Full name */
 853                     SET( vlc_meta_SetTitle );
 854                     break;
 855                 case FOURCC_0xa9aut:
 856                     SET( vlc_meta_SetArtist );
 857                     break;
 858                 case FOURCC_0xa9ART:
 859                     SET( vlc_meta_SetArtist );
 860                     break;
 861                 case FOURCC_0xa9cpy:
 862                     SET( vlc_meta_SetCopyright );
 863                     break;
 864                 case FOURCC_0xa9day: /* Creation Date */
 865                     SET( vlc_meta_SetDate );
 866                     break;
 867                 case FOURCC_0xa9des: /* Description */
 868                     SET( vlc_meta_SetDescription );
 869                     break;
 870                 case FOURCC_0xa9gen: /* Genre */
 871                     SET( vlc_meta_SetGenre );
 872                     break;
 873
 874                 case FOURCC_0xa9alb: /* Album */
 875                     SET( vlc_meta_SetAlbum );
 876                     break;
 877
 878                 case FOURCC_0xa9trk: /* Track */
 879                     SET( vlc_meta_SetTracknum );
 880                     break;
 881
 882                 case FOURCC_0xa9cmt: /* Commment */
 883                     SET( vlc_meta_SetDescription );
 884                     break;
 885
 886                 case FOURCC_0xa9url: /* URL */
 887                     SET( vlc_meta_SetURL );
 888                     break;
 889
 890                 case FOURCC_0xa9enc: /* Encoded By */
 891                     SET( vlc_meta_SetEncodedBy );
 892                     break;
 893
 894                 case FOURCC_0xa9swr:
 895                 case FOURCC_0xa9inf: /* Information */
 896                 case FOURCC_0xa9dir: /* Director */
 897                 case FOURCC_0xa9dis: /* Disclaimer */
 898                 case FOURCC_0xa9req: /* Requirements */
 899                 case FOURCC_0xa9fmt: /* Original Format */
 900                 case FOURCC_0xa9dsa: /* Display Source As */
 901                 case FOURCC_0xa9hst: /* Host Computer */
 902                 case FOURCC_0xa9prd: /* Producer */
 903                 case FOURCC_0xa9prf: /* Performers */
 904                 case FOURCC_0xa9ope: /* Original Performer */
 905                 case FOURCC_0xa9src: /* Providers Source Content */
 906                 case FOURCC_0xa9wrt: /* Writer */
 907                 case FOURCC_0xa9com: /* Composer */
 908                 case FOURCC_WLOC:    /* Window Location */
 909                     /* TODO one day, but they aren't really meaningfull */
 910                     break;
 911 #undef SET
 912
 913                 default:
 914                     break;
 915                 }
 916             }
 917             return VLC_SUCCESS;
 918         }
 919
 920         case DEMUX_GET_TITLE_INFO:
 921         {
 922             input_title_t ***ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
 923             int *pi_int    = (int*)va_arg( args, int* );
 924             int *pi_title_offset = (int*)va_arg( args, int* );
 925             int *pi_seekpoint_offset = (int*)va_arg( args, int* );
 926
 927             if( !p_sys->p_title )
 928                 return VLC_EGENERIC;
 929
 930             *pi_int = 1;
 931             *ppp_title = malloc( sizeof( input_title_t**) );
 932             (*ppp_title)[0] = vlc_input_title_Duplicate( p_sys->p_title );
 933             *pi_title_offset = 0;
 934             *pi_seekpoint_offset = 0;
 935             return VLC_SUCCESS;
 936         }
 937         case DEMUX_SET_TITLE:
 938         {
 939             const int i_title = (int)va_arg( args, int );
 940             if( !p_sys->p_title || i_title != 0 )
 941                 return VLC_EGENERIC;
 942             return VLC_SUCCESS;
 943         }
 944         case DEMUX_SET_SEEKPOINT:
 945         {
 946             const int i_seekpoint = (int)va_arg( args, int );
 947             if( !p_sys->p_title )
 948                 return VLC_EGENERIC;
 949             return Seek( p_demux, p_sys->p_title->seekpoint[i_seekpoint]->i_time_offset );
 950         }
 951
 952         case DEMUX_SET_NEXT_DEMUX_TIME:
 953         case DEMUX_SET_GROUP:
 954         case DEMUX_HAS_UNSUPPORTED_META:
 955         case DEMUX_GET_ATTACHMENTS:
 956             return VLC_EGENERIC;
 957
 958         default:
 959             msg_Warn( p_demux, "control query %u unimplemented", i_query );
 960             return VLC_EGENERIC;
 961     }
 962 }
 963
 964 /*****************************************************************************
 965  * Close: frees unused data
 966  *****************************************************************************/
 967 static void Close ( vlc_object_t * p_this )
 968 {
 969     demux_t *  p_demux = (demux_t *)p_this;
 970     demux_sys_t *p_sys = p_demux->p_sys;
 971     unsigned int i_track;
 972
 973     msg_Dbg( p_demux, "freeing all memory" );
 974
 975     MP4_BoxFree( p_demux->s, p_sys->p_root );
 976     for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
 977     {
 978         MP4_TrackDestroy(  &p_sys->track[i_track] );
 979     }
 980     FREENULL( p_sys->track );
 981
 982     if( p_sys->p_title )
 983         vlc_input_title_Delete( p_sys->p_title );
 984
 985     free( p_sys );
 986 }
 987
 988
 989
 990 /****************************************************************************
 991  * Local functions, specific to vlc
 992  ****************************************************************************/
 993 /* Chapters */
 994 static void LoadChapterGpac( demux_t  *p_demux, MP4_Box_t *p_chpl )
 995 {
 996     demux_sys_t *p_sys = p_demux->p_sys;
 997     int i;
 998
 999     p_sys->p_title = vlc_input_title_New();
1000     for( i = 0; i < p_chpl->data.p_chpl->i_chapter; i++ )
1001     {
1002         seekpoint_t *s = vlc_seekpoint_New();
1003
1004         s->psz_name = strdup( p_chpl->data.p_chpl->chapter[i].psz_name );
1005         EnsureUTF8( s->psz_name );
1006         s->i_time_offset = p_chpl->data.p_chpl->chapter[i].i_start / 10;
1007         TAB_APPEND( p_sys->p_title->i_seekpoint, p_sys->p_title->seekpoint, s );
1008     }
1009 }
1010 static void LoadChapterApple( demux_t  *p_demux, mp4_track_t *tk )
1011 {
1012     demux_sys_t *p_sys = p_demux->p_sys;
1013
1014     for( tk->i_sample = 0; tk->i_sample < tk->i_sample_count; tk->i_sample++ )
1015     {
1016         const int64_t i_dts = MP4_TrackGetDTS( p_demux, tk );
1017         const int64_t i_pts_delta = MP4_TrackGetPTSDelta( tk );
1018         const unsigned int i_size = MP4_TrackSampleSize( tk );
1019
1020         if( i_size > 0 && !stream_Seek( p_demux->s, MP4_TrackGetPos( tk ) ) )
1021         {
1022             char p_buffer[256];
1023             const int i_read = stream_Read( p_demux->s, p_buffer, __MIN( sizeof(p_buffer), i_size ) );
1024             const int i_len = __MIN( GetWBE(p_buffer), i_read-2 );
1025
1026             if( i_len > 0 )
1027             {
1028                 seekpoint_t *s = vlc_seekpoint_New();
1029
1030                 s->psz_name = strndup( &p_buffer[2], i_len );
1031                 EnsureUTF8( s->psz_name );
1032
1033                 s->i_time_offset = i_dts + __MAX( i_pts_delta, 0 );
1034
1035                 if( !p_sys->p_title )
1036                     p_sys->p_title = vlc_input_title_New();
1037                 TAB_APPEND( p_sys->p_title->i_seekpoint, p_sys->p_title->seekpoint, s );
1038             }
1039         }
1040         if( tk->i_sample+1 >= tk->chunk[tk->i_chunk].i_sample_first +
1041                               tk->chunk[tk->i_chunk].i_sample_count )
1042             tk->i_chunk++;
1043     }
1044 }
1045 static void LoadChapter( demux_t  *p_demux )
1046 {
1047     demux_sys_t *p_sys = p_demux->p_sys;
1048     MP4_Box_t *p_chpl;
1049
1050     if( ( p_chpl = MP4_BoxGet( p_sys->p_root, "/moov/udta/chpl" ) ) && p_chpl->data.p_chpl->i_chapter > 0 )
1051     {
1052         LoadChapterGpac( p_demux, p_chpl );
1053     }
1054     else if( p_sys->p_tref_chap )
1055     {
1056         MP4_Box_data_tref_generic_t *p_chap = p_sys->p_tref_chap->data.p_tref_generic;
1057         unsigned int i, j;
1058
1059         /* Load the first subtitle track like quicktime */
1060         for( i = 0; i < p_chap->i_entry_count; i++ )
1061         {
1062             for( j = 0; j < p_sys->i_tracks; j++ )
1063             {
1064                 mp4_track_t *tk = &p_sys->track[j];
1065                 if( tk->b_ok && tk->i_track_ID == p_chap->i_track_ID[i] &&
1066                     tk->fmt.i_cat == SPU_ES && tk->fmt.i_codec == VLC_FOURCC( 's', 'u', 'b', 't' ) )
1067                     break;
1068             }
1069             if( j < p_sys->i_tracks )
1070             {
1071                 LoadChapterApple( p_demux, &p_sys->track[i] );
1072                 break;
1073             }
1074         }
1075     }
1076 }
1077
1078 /* now create basic chunk data, the rest will be filled by MP4_CreateSamplesIndex */
1079 static int TrackCreateChunksIndex( demux_t *p_demux,
1080                                    mp4_track_t *p_demux_track )
1081 {
1082     MP4_Box_t *p_co64; /* give offset for each chunk, same for stco and co64 */
1083     MP4_Box_t *p_stsc;
1084
1085     unsigned int i_chunk;
1086     unsigned int i_index, i_last;
1087
1088     if( ( !(p_co64 = MP4_BoxGet( p_demux_track->p_stbl, "stco" ) )&&
1089           !(p_co64 = MP4_BoxGet( p_demux_track->p_stbl, "co64" ) ) )||
1090         ( !(p_stsc = MP4_BoxGet( p_demux_track->p_stbl, "stsc" ) ) ))
1091     {
1092         return( VLC_EGENERIC );
1093     }
1094
1095     p_demux_track->i_chunk_count = p_co64->data.p_co64->i_entry_count;
1096     if( !p_demux_track->i_chunk_count )
1097     {
1098         msg_Warn( p_demux, "no chunk defined" );
1099         return( VLC_EGENERIC );
1100     }
1101     p_demux_track->chunk = calloc( p_demux_track->i_chunk_count,
1102                                    sizeof( mp4_chunk_t ) );
1103     if( p_demux_track->chunk == NULL )
1104     {
1105         return VLC_ENOMEM;
1106     }
1107
1108     /* first we read chunk offset */
1109     for( i_chunk = 0; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
1110     {
1111         mp4_chunk_t *ck = &p_demux_track->chunk[i_chunk];
1112
1113         ck->i_offset = p_co64->data.p_co64->i_chunk_offset[i_chunk];
1114
1115         ck->i_first_dts = 0;
1116         ck->p_sample_count_dts = NULL;
1117         ck->p_sample_delta_dts = NULL;
1118         ck->p_sample_count_pts = NULL;
1119         ck->p_sample_offset_pts = NULL;
1120     }
1121
1122     /* now we read index for SampleEntry( soun vide mp4a mp4v ...)
1123         to be used for the sample XXX begin to 1
1124         We construct it begining at the end */
1125     i_last = p_demux_track->i_chunk_count; /* last chunk proceded */
1126     i_index = p_stsc->data.p_stsc->i_entry_count;
1127     if( !i_index )
1128     {
1129         msg_Warn( p_demux, "cannot read chunk table or table empty" );
1130         return( VLC_EGENERIC );
1131     }
1132
1133     while( i_index-- )
1134     {
1135         for( i_chunk = p_stsc->data.p_stsc->i_first_chunk[i_index] - 1;
1136              i_chunk < i_last; i_chunk++ )
1137         {
1138             if( i_chunk >= p_demux_track->i_chunk_count )
1139             {
1140                 msg_Warn( p_demux, "corrupted chunk table" );
1141                 return VLC_EGENERIC;
1142             }
1143
1144             p_demux_track->chunk[i_chunk].i_sample_description_index =
1145                     p_stsc->data.p_stsc->i_sample_description_index[i_index];
1146             p_demux_track->chunk[i_chunk].i_sample_count =
1147                     p_stsc->data.p_stsc->i_samples_per_chunk[i_index];
1148         }
1149         i_last = p_stsc->data.p_stsc->i_first_chunk[i_index] - 1;
1150     }
1151
1152     p_demux_track->chunk[0].i_sample_first = 0;
1153     for( i_chunk = 1; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
1154     {
1155         p_demux_track->chunk[i_chunk].i_sample_first =
1156             p_demux_track->chunk[i_chunk-1].i_sample_first +
1157                 p_demux_track->chunk[i_chunk-1].i_sample_count;
1158     }
1159
1160     msg_Dbg( p_demux, "track[Id 0x%x] read %d chunk",
1161              p_demux_track->i_track_ID, p_demux_track->i_chunk_count );
1162
1163     return VLC_SUCCESS;
1164 }
1165
1166 static int TrackCreateSamplesIndex( demux_t *p_demux,
1167                                     mp4_track_t *p_demux_track )
1168 {
1169     MP4_Box_t *p_box;
1170     MP4_Box_data_stsz_t *stsz;
1171     MP4_Box_data_stts_t *stts;
1172     /* TODO use also stss and stsh table for seeking */
1173     /* FIXME use edit table */
1174     int64_t i_sample;
1175     int64_t i_chunk;
1176
1177     int64_t i_index;
1178     int64_t i_index_sample_used;
1179
1180     int64_t i_last_dts;
1181
1182     /* Find stsz
1183      *  Gives the sample size for each samples. There is also a stz2 table
1184      *  (compressed form) that we need to implement TODO */
1185     p_box = MP4_BoxGet( p_demux_track->p_stbl, "stsz" );
1186     if( !p_box )
1187     {
1188         /* FIXME and stz2 */
1189         msg_Warn( p_demux, "cannot find STSZ box" );
1190         return VLC_EGENERIC;
1191     }
1192     stsz = p_box->data.p_stsz;
1193
1194     /* Find stts
1195      *  Gives mapping between sample and decoding time
1196      */
1197     p_box = MP4_BoxGet( p_demux_track->p_stbl, "stts" );
1198     if( !p_box )
1199     {
1200         msg_Warn( p_demux, "cannot find STTS box" );
1201         return VLC_EGENERIC;
1202     }
1203     stts = p_box->data.p_stts;
1204
1205     /* Use stsz table to create a sample number -> sample size table */
1206     p_demux_track->i_sample_count = stsz->i_sample_count;
1207     if( stsz->i_sample_size )
1208     {
1209         /* 1: all sample have the same size, so no need to construct a table */
1210         p_demux_track->i_sample_size = stsz->i_sample_size;
1211         p_demux_track->p_sample_size = NULL;
1212     }
1213     else
1214     {
1215         /* 2: each sample can have a different size */
1216         p_demux_track->i_sample_size = 0;
1217         p_demux_track->p_sample_size =
1218             calloc( p_demux_track->i_sample_count, sizeof( uint32_t ) );
1219         if( p_demux_track->p_sample_size == NULL )
1220             return VLC_ENOMEM;
1221
1222         for( i_sample = 0; i_sample < p_demux_track->i_sample_count; i_sample++ )
1223         {
1224             p_demux_track->p_sample_size[i_sample] =
1225                     stsz->i_entry_size[i_sample];
1226         }
1227     }
1228
1229     /* Use stts table to create a sample number -> dts table.
1230      * XXX: if we don't want to waste too much memory, we can't expand
1231      *  the box! so each chunk will contain an "extract" of this table
1232      *  for fast research (problem with raw stream where a sample is sometime
1233      *  just channels*bits_per_sample/8 */
1234
1235     i_last_dts = 0;
1236     i_index = 0; i_index_sample_used = 0;
1237     for( i_chunk = 0; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
1238     {
1239         mp4_chunk_t *ck = &p_demux_track->chunk[i_chunk];
1240         int64_t i_entry, i_sample_count, i;
1241
1242         /* save last dts */
1243         ck->i_first_dts = i_last_dts;
1244
1245         /* count how many entries are needed for this chunk
1246          * for p_sample_delta_dts and p_sample_count_dts */
1247         i_sample_count = ck->i_sample_count;
1248
1249         i_entry = 0;
1250         while( i_sample_count > 0 )
1251         {
1252             i_sample_count -= stts->i_sample_count[i_index+i_entry];
1253             /* don't count already used sample in this entry */
1254             if( i_entry == 0 )
1255                 i_sample_count += i_index_sample_used;
1256
1257             i_entry++;
1258         }
1259
1260         /* allocate them */
1261         ck->p_sample_count_dts = calloc( i_entry, sizeof( uint32_t ) );
1262         ck->p_sample_delta_dts = calloc( i_entry, sizeof( uint32_t ) );
1263
1264         /* now copy */
1265         i_sample_count = ck->i_sample_count;
1266         for( i = 0; i < i_entry; i++ )
1267         {
1268             int64_t i_used;
1269             int64_t i_rest;
1270
1271             i_rest = stts->i_sample_count[i_index] - i_index_sample_used;
1272
1273             i_used = __MIN( i_rest, i_sample_count );
1274
1275             i_index_sample_used += i_used;
1276             i_sample_count -= i_used;
1277
1278             ck->p_sample_count_dts[i] = i_used;
1279             ck->p_sample_delta_dts[i] = stts->i_sample_delta[i_index];
1280
1281             i_last_dts += i_used * ck->p_sample_delta_dts[i];
1282
1283             if( i_index_sample_used >= stts->i_sample_count[i_index] )
1284             {
1285                 i_index++;
1286                 i_index_sample_used = 0;
1287             }
1288         }
1289     }
1290
1291     /* Find ctts
1292      *  Gives the delta between decoding time (dts) and composition table (pts)
1293      */
1294     p_box = MP4_BoxGet( p_demux_track->p_stbl, "ctts" );
1295     if( p_box )
1296     {
1297         MP4_Box_data_ctts_t *ctts = p_box->data.p_ctts;
1298
1299         msg_Warn( p_demux, "CTTS table" );
1300
1301         /* Create pts-dts table per chunk */
1302         i_index = 0; i_index_sample_used = 0;
1303         for( i_chunk = 0; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
1304         {
1305             mp4_chunk_t *ck = &p_demux_track->chunk[i_chunk];
1306             int64_t i_entry, i_sample_count, i;
1307
1308             /* count how many entries are needed for this chunk
1309              * for p_sample_delta_dts and p_sample_count_dts */
1310             i_sample_count = ck->i_sample_count;
1311
1312             i_entry = 0;
1313             while( i_sample_count > 0 )
1314             {
1315                 i_sample_count -= ctts->i_sample_count[i_index+i_entry];
1316
1317                 /* don't count already used sample in this entry */
1318                 if( i_entry == 0 )
1319                     i_sample_count += i_index_sample_used;
1320
1321                 i_entry++;
1322             }
1323
1324             /* allocate them */
1325             ck->p_sample_count_pts = calloc( i_entry, sizeof( uint32_t ) );
1326             ck->p_sample_offset_pts = calloc( i_entry, sizeof( int32_t ) );
1327
1328             /* now copy */
1329             i_sample_count = ck->i_sample_count;
1330             for( i = 0; i < i_entry; i++ )
1331             {
1332                 int64_t i_used;
1333                 int64_t i_rest;
1334
1335                 i_rest = ctts->i_sample_count[i_index] -
1336                     i_index_sample_used;
1337
1338                 i_used = __MIN( i_rest, i_sample_count );
1339
1340                 i_index_sample_used += i_used;
1341                 i_sample_count -= i_used;
1342
1343                 ck->p_sample_count_pts[i] = i_used;
1344                 ck->p_sample_offset_pts[i] = ctts->i_sample_offset[i_index];
1345
1346                 if( i_index_sample_used >= ctts->i_sample_count[i_index] )
1347                 {
1348                     i_index++;
1349                     i_index_sample_used = 0;
1350                 }
1351             }
1352         }
1353     }
1354
1355     msg_Dbg( p_demux, "track[Id 0x%x] read %d samples length:%"PRId64"s",
1356              p_demux_track->i_track_ID, p_demux_track->i_sample_count,
1357              i_last_dts / p_demux_track->i_timescale );
1358
1359     return VLC_SUCCESS;
1360 }
1361
1362 /*
1363  * TrackCreateES:
1364  * Create ES and PES to init decoder if needed, for a track starting at i_chunk
1365  */
1366 static int TrackCreateES( demux_t *p_demux, mp4_track_t *p_track,
1367                           unsigned int i_chunk, es_out_id_t **pp_es )
1368 {
1369     MP4_Box_t   *p_sample;
1370     MP4_Box_t   *p_esds;
1371     MP4_Box_t   *p_box;
1372
1373     if( pp_es )
1374         *pp_es = NULL;
1375
1376     if( !p_track->chunk[i_chunk].i_sample_description_index )
1377     {
1378         msg_Warn( p_demux, "invalid SampleEntry index (track[Id 0x%x])",
1379                   p_track->i_track_ID );
1380         return VLC_EGENERIC;
1381     }
1382
1383     p_sample = MP4_BoxGet(  p_track->p_stsd, "[%d]",
1384                 p_track->chunk[i_chunk].i_sample_description_index - 1 );
1385
1386     if( !p_sample ||
1387         ( !p_sample->data.p_data && p_track->fmt.i_cat != SPU_ES ) )
1388     {
1389         msg_Warn( p_demux, "cannot find SampleEntry (track[Id 0x%x])",
1390                   p_track->i_track_ID );
1391         return VLC_EGENERIC;
1392     }
1393
1394     p_track->p_sample = p_sample;
1395
1396     if( p_track->fmt.i_cat == AUDIO_ES && ( p_track->i_sample_size == 1 || p_track->i_sample_size == 2 ) )
1397     {
1398         MP4_Box_data_sample_soun_t *p_soun;
1399
1400         p_soun = p_sample->data.p_sample_soun;
1401
1402         if( p_soun->i_qt_version == 0 )
1403         {
1404             switch( p_sample->i_type )
1405             {
1406                 case VLC_FOURCC( 'i', 'm', 'a', '4' ):
1407                     p_soun->i_qt_version = 1;
1408                     p_soun->i_sample_per_packet = 64;
1409                     p_soun->i_bytes_per_packet  = 34;
1410                     p_soun->i_bytes_per_frame   = 34 * p_soun->i_channelcount;
1411                     p_soun->i_bytes_per_sample  = 2;
1412                     break;
1413                 case VLC_FOURCC( 'M', 'A', 'C', '3' ):
1414                     p_soun->i_qt_version = 1;
1415                     p_soun->i_sample_per_packet = 6;
1416                     p_soun->i_bytes_per_packet  = 2;
1417                     p_soun->i_bytes_per_frame   = 2 * p_soun->i_channelcount;
1418                     p_soun->i_bytes_per_sample  = 2;
1419                     break;
1420                 case VLC_FOURCC( 'M', 'A', 'C', '6' ):
1421                     p_soun->i_qt_version = 1;
1422                     p_soun->i_sample_per_packet = 12;
1423                     p_soun->i_bytes_per_packet  = 2;
1424                     p_soun->i_bytes_per_frame   = 2 * p_soun->i_channelcount;
1425                     p_soun->i_bytes_per_sample  = 2;
1426                     break;
1427                 case VLC_FOURCC( 'a', 'l', 'a', 'w' ):
1428                 case VLC_FOURCC( 'u', 'l', 'a', 'w' ):
1429                     p_soun->i_samplesize = 8;
1430                     break;
1431                 case VLC_FOURCC( 'N', 'O', 'N', 'E' ):
1432                 case VLC_FOURCC( 'r', 'a', 'w', ' ' ):
1433                 case VLC_FOURCC( 't', 'w', 'o', 's' ):
1434                 case VLC_FOURCC( 's', 'o', 'w', 't' ):
1435                     /* What would be the fun if you could trust the .mov */
1436                     p_track->i_sample_size = ((p_soun->i_samplesize+7)/8) * p_soun->i_channelcount;
1437                     break;
1438                 default:
1439                     break;
1440             }
1441
1442         }
1443         else if( p_soun->i_qt_version == 1 && p_soun->i_sample_per_packet <= 0 )
1444         {
1445             p_soun->i_qt_version = 0;
1446         }
1447     }
1448
1449     /* It's a little ugly but .. there are special cases */
1450     switch( p_sample->i_type )
1451     {
1452         case( VLC_FOURCC( '.', 'm', 'p', '3' ) ):
1453         case( VLC_FOURCC( 'm', 's', 0x00, 0x55 ) ):
1454             p_track->fmt.i_codec = VLC_FOURCC( 'm', 'p', 'g', 'a' );
1455             break;
1456
1457         case( VLC_FOURCC( 'r', 'a', 'w', ' ' ) ):
1458         case( VLC_FOURCC( 'N', 'O', 'N', 'E' ) ):
1459         {
1460             MP4_Box_data_sample_soun_t *p_soun = p_sample->data.p_sample_soun;
1461
1462             if(p_soun && (p_soun->i_samplesize+7)/8 == 1 )
1463                 p_track->fmt.i_codec = VLC_FOURCC( 'u', '8', ' ', ' ' );
1464             else
1465                 p_track->fmt.i_codec = VLC_FOURCC( 't', 'w', 'o', 's' );
1466
1467             /* Buggy files workaround */
1468             if( p_sample->data.p_sample_soun && (p_track->i_timescale !=
1469                 p_sample->data.p_sample_soun->i_sampleratehi) )
1470             {
1471                 MP4_Box_data_sample_soun_t *p_soun =
1472                     p_sample->data.p_sample_soun;
1473
1474                 msg_Warn( p_demux, "i_timescale (%"PRIu64") != i_sampleratehi "
1475                           "(%u), making both equal (report any problem).",
1476                           p_track->i_timescale, p_soun->i_sampleratehi );
1477
1478                 if( p_soun->i_sampleratehi )
1479                     p_track->i_timescale = p_soun->i_sampleratehi;
1480                 else
1481                     p_soun->i_sampleratehi = p_track->i_timescale;
1482             }
1483             break;
1484         }
1485
1486         case( VLC_FOURCC( 's', '2', '6', '3' ) ):
1487             p_track->fmt.i_codec = VLC_FOURCC( 'h', '2', '6', '3' );
1488             break;
1489
1490         case( VLC_FOURCC( 't', 'e', 'x', 't' ) ):
1491         case( VLC_FOURCC( 't', 'x', '3', 'g' ) ):
1492             p_track->fmt.i_codec = VLC_FOURCC( 's', 'u', 'b', 't' );
1493             /* FIXME: Not true, could be UTF-16 with a Byte Order Mark (0xfeff) */
1494             /* FIXME UTF-8 doesn't work here ? */
1495             p_track->fmt.subs.psz_encoding = strdup( "UTF-8" );
1496             break;
1497
1498         case VLC_FOURCC('y','v','1','2'):
1499             p_track->fmt.i_codec = VLC_FOURCC('Y','V','1','2');
1500             break;
1501         case VLC_FOURCC('y','u','v','2'):
1502             p_track->fmt.i_codec = VLC_FOURCC('Y','U','Y','2');
1503             break;
1504
1505         case VLC_FOURCC('i','n','2','4'):
1506             /* in in24/in32 there's enda-atom to tell it's little-endian (if present) */
1507             if( ( MP4_BoxGet( p_sample, "wave/enda" ) ) ||
1508                 ( MP4_BoxGet( p_sample, "enda" ) ) )
1509             {
1510                 p_track->fmt.i_codec = VLC_FOURCC('4','2','n','i');
1511             } else {
1512                 p_track->fmt.i_codec = p_sample->i_type;
1513             }
1514             break;
1515
1516         default:
1517             p_track->fmt.i_codec = p_sample->i_type;
1518             break;
1519     }
1520
1521     /* now see if esds is present and if so create a data packet
1522         with decoder_specific_info  */
1523 #define p_decconfig p_esds->data.p_esds->es_descriptor.p_decConfigDescr
1524     if( ( ( p_esds = MP4_BoxGet( p_sample, "esds" ) ) ||
1525           ( p_esds = MP4_BoxGet( p_sample, "wave/esds" ) ) )&&
1526         ( p_esds->data.p_esds )&&
1527         ( p_decconfig ) )
1528     {
1529         /* First update information based on i_objectTypeIndication */
1530         switch( p_decconfig->i_objectTypeIndication )
1531         {
1532             case( 0x20 ): /* MPEG4 VIDEO */
1533                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','4','v' );
1534                 break;
1535             case( 0x40):
1536                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','4','a' );
1537                 break;
1538             case( 0x60):
1539             case( 0x61):
1540             case( 0x62):
1541             case( 0x63):
1542             case( 0x64):
1543             case( 0x65): /* MPEG2 video */
1544                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
1545                 break;
1546             /* Theses are MPEG2-AAC */
1547             case( 0x66): /* main profile */
1548             case( 0x67): /* Low complexity profile */
1549             case( 0x68): /* Scaleable Sampling rate profile */
1550                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','4','a' );
1551                 break;
1552             /* true MPEG 2 audio */
1553             case( 0x69):
1554                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','a' );
1555                 break;
1556             case( 0x6a): /* MPEG1 video */
1557                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
1558                 break;
1559             case( 0x6b): /* MPEG1 audio */
1560                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','a' );
1561                 break;
1562             case( 0x6c ): /* jpeg */
1563                 p_track->fmt.i_codec = VLC_FOURCC( 'j','p','e','g' );
1564                 break;
1565
1566             /* Private ID */
1567             case( 0xe0 ): /* NeroDigital: dvd subs */
1568                 if( p_track->fmt.i_cat == SPU_ES )
1569                 {
1570                     p_track->fmt.i_codec = VLC_FOURCC( 's','p','u',' ' );
1571                     if( p_track->i_width > 0 )
1572                         p_track->fmt.subs.spu.i_original_frame_width = p_track->i_width;
1573                     if( p_track->i_height > 0 )
1574                         p_track->fmt.subs.spu.i_original_frame_height = p_track->i_height;
1575                     break;
1576                 }
1577             /* Fallback */
1578             default:
1579                 /* Unknown entry, but don't touch i_fourcc */
1580                 msg_Warn( p_demux,
1581                           "unknown objectTypeIndication(0x%x) (Track[ID 0x%x])",
1582                           p_decconfig->i_objectTypeIndication,
1583                           p_track->i_track_ID );
1584                 break;
1585         }
1586         p_track->fmt.i_extra = p_decconfig->i_decoder_specific_info_len;
1587         if( p_track->fmt.i_extra > 0 )
1588         {
1589             p_track->fmt.p_extra = malloc( p_track->fmt.i_extra );
1590             memcpy( p_track->fmt.p_extra, p_decconfig->p_decoder_specific_info,
1591                     p_track->fmt.i_extra );
1592         }
1593     }
1594     else
1595     {
1596         switch( p_sample->i_type )
1597         {
1598             /* qt decoder, send the complete chunk */
1599             case VLC_FOURCC ('h', 'd', 'v', '1'): // HDV 720p30
1600             case VLC_FOURCC ('h', 'd', 'v', '2'): // HDV 1080i60
1601             case VLC_FOURCC ('h', 'd', 'v', '3'): // HDV 1080i50
1602             case VLC_FOURCC ('h', 'd', 'v', '5'): // HDV 720p25
1603             case VLC_FOURCC ('m', 'x', '5', 'n'): // MPEG2 IMX NTSC 525/60 50mb/s produced by FCP
1604             case VLC_FOURCC ('m', 'x', '5', 'p'): // MPEG2 IMX PAL 625/60 50mb/s produced by FCP
1605             case VLC_FOURCC ('m', 'x', '4', 'n'): // MPEG2 IMX NTSC 525/60 40mb/s produced by FCP
1606             case VLC_FOURCC ('m', 'x', '4', 'p'): // MPEG2 IMX PAL 625/60 40mb/s produced by FCP
1607             case VLC_FOURCC ('m', 'x', '3', 'n'): // MPEG2 IMX NTSC 525/60 30mb/s produced by FCP
1608             case VLC_FOURCC ('m', 'x', '3', 'p'): // MPEG2 IMX PAL 625/50 30mb/s produced by FCP
1609             case VLC_FOURCC ('x', 'd', 'v', '2'): // XDCAM HD 1080i60
1610             case VLC_FOURCC ('A', 'V', 'm', 'p'): // AVID IMX PAL
1611                 p_track->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
1612                 break;
1613             /* qt decoder, send the complete chunk */
1614             case VLC_FOURCC( 'S', 'V', 'Q', '3' ):
1615             case VLC_FOURCC( 'S', 'V', 'Q', '1' ):
1616             case VLC_FOURCC( 'V', 'P', '3', '1' ):
1617             case VLC_FOURCC( '3', 'I', 'V', '1' ):
1618             case VLC_FOURCC( 'Z', 'y', 'G', 'o' ):
1619                 p_track->fmt.i_extra =
1620                     p_sample->data.p_sample_vide->i_qt_image_description;
1621                 if( p_track->fmt.i_extra > 0 )
1622                 {
1623                     p_track->fmt.p_extra = malloc( p_track->fmt.i_extra );
1624                     memcpy( p_track->fmt.p_extra,
1625                             p_sample->data.p_sample_vide->p_qt_image_description,
1626                             p_track->fmt.i_extra);
1627                 }
1628                 break;
1629             case VLC_FOURCC( 'Q', 'D', 'M', 'C' ):
1630             case VLC_FOURCC( 'Q', 'D', 'M', '2' ):
1631             case VLC_FOURCC( 'Q', 'c', 'l', 'p' ):
1632             case VLC_FOURCC( 's', 'a', 'm', 'r' ):
1633             case VLC_FOURCC( 'a', 'l', 'a', 'c' ):
1634                 p_track->fmt.i_extra =
1635                     p_sample->data.p_sample_soun->i_qt_description;
1636                 if( p_track->fmt.i_extra > 0 )
1637                 {
1638                     p_track->fmt.p_extra = malloc( p_track->fmt.i_extra );
1639                     memcpy( p_track->fmt.p_extra,
1640                             p_sample->data.p_sample_soun->p_qt_description,
1641                             p_track->fmt.i_extra);
1642                 }
1643                 break;
1644
1645             /* avc1: send avcC (h264 without annexe B, ie without start code)*/
1646             case VLC_FOURCC( 'a', 'v', 'c', '1' ):
1647             {
1648                 MP4_Box_t *p_avcC = MP4_BoxGet( p_sample, "avcC" );
1649
1650                 if( p_avcC )
1651                 {
1652                     p_track->fmt.i_extra = p_avcC->data.p_avcC->i_avcC;
1653                     p_track->fmt.p_extra = malloc( p_avcC->data.p_avcC->i_avcC );
1654                     memcpy( p_track->fmt.p_extra, p_avcC->data.p_avcC->p_avcC,
1655                             p_track->fmt.i_extra );
1656                 }
1657                 else
1658                 {
1659                     msg_Err( p_demux, "missing avcC" );
1660                 }
1661                 break;
1662             }
1663
1664             case VLC_FOURCC('m','s',0x00,0x02):
1665             case VLC_FOURCC('m','s',0x00,0x11):
1666                 p_track->fmt.audio.i_blockalign = p_sample->data.p_sample_soun->i_bytes_per_frame;
1667                 break;
1668
1669             default:
1670                 break;
1671         }
1672     }
1673
1674 #undef p_decconfig
1675
1676     /* some last initialisation */
1677     switch( p_track->fmt.i_cat )
1678     {
1679     case( VIDEO_ES ):
1680         p_track->fmt.video.i_width = p_sample->data.p_sample_vide->i_width;
1681         p_track->fmt.video.i_height = p_sample->data.p_sample_vide->i_height;
1682         p_track->fmt.video.i_bits_per_pixel =
1683             p_sample->data.p_sample_vide->i_depth;
1684
1685         /* fall on display size */
1686         if( p_track->fmt.video.i_width <= 0 )
1687             p_track->fmt.video.i_width = p_track->i_width;
1688         if( p_track->fmt.video.i_height <= 0 )
1689             p_track->fmt.video.i_height = p_track->i_height;
1690
1691         /* Find out apect ratio from display size */
1692         if( p_track->i_width > 0 && p_track->i_height > 0 &&
1693             /* Work-around buggy muxed files */
1694             p_sample->data.p_sample_vide->i_width != p_track->i_width )
1695             p_track->fmt.video.i_aspect =
1696                 VOUT_ASPECT_FACTOR * p_track->i_width / p_track->i_height;
1697
1698         /* Support for cropping (eg. in H263 files) */
1699         p_track->fmt.video.i_visible_width = p_track->fmt.video.i_width;
1700         p_track->fmt.video.i_visible_height = p_track->fmt.video.i_height;
1701
1702         /* Frame rate */
1703         p_track->fmt.video.i_frame_rate = p_track->i_timescale;
1704         p_track->fmt.video.i_frame_rate_base = 1;
1705
1706         if( p_track->fmt.video.i_frame_rate &&
1707             (p_box = MP4_BoxGet( p_track->p_stbl, "stts" )) &&
1708             p_box->data.p_stts->i_entry_count >= 1 )
1709         {
1710             p_track->fmt.video.i_frame_rate_base =
1711                 p_box->data.p_stts->i_sample_delta[0];
1712         }
1713
1714         break;
1715
1716     case( AUDIO_ES ):
1717         p_track->fmt.audio.i_channels =
1718             p_sample->data.p_sample_soun->i_channelcount;
1719         p_track->fmt.audio.i_rate =
1720             p_sample->data.p_sample_soun->i_sampleratehi;
1721         p_track->fmt.i_bitrate = p_sample->data.p_sample_soun->i_channelcount *
1722             p_sample->data.p_sample_soun->i_sampleratehi *
1723                 p_sample->data.p_sample_soun->i_samplesize;
1724         p_track->fmt.audio.i_bitspersample =
1725             p_sample->data.p_sample_soun->i_samplesize;
1726         break;
1727
1728     default:
1729         break;
1730     }
1731
1732     if( pp_es )
1733         *pp_es = es_out_Add( p_demux->out, &p_track->fmt );
1734
1735     return VLC_SUCCESS;
1736 }
1737
1738 /* given a time it return sample/chunk
1739  * it also update elst field of the track
1740  */
1741 static int TrackTimeToSampleChunk( demux_t *p_demux, mp4_track_t *p_track,
1742                                    int64_t i_start, uint32_t *pi_chunk,
1743                                    uint32_t *pi_sample )
1744 {
1745     demux_sys_t *p_sys = p_demux->p_sys;
1746     MP4_Box_t   *p_stss;
1747     uint64_t     i_dts;
1748     unsigned int i_sample;
1749     unsigned int i_chunk;
1750     int          i_index;
1751
1752     /* FIXME see if it's needed to check p_track->i_chunk_count */
1753     if( p_track->i_chunk_count == 0 )
1754         return( VLC_EGENERIC );
1755
1756     /* handle elst (find the correct one) */
1757     MP4_TrackSetELST( p_demux, p_track, i_start );
1758     if( p_track->p_elst && p_track->p_elst->data.p_elst->i_entry_count > 0 )
1759     {
1760         MP4_Box_data_elst_t *elst = p_track->p_elst->data.p_elst;
1761         int64_t i_mvt= i_start * p_sys->i_timescale / (int64_t)1000000;
1762
1763         /* now calculate i_start for this elst */
1764         /* offset */
1765         i_start -= p_track->i_elst_time * INT64_C(1000000) / p_sys->i_timescale;
1766         if( i_start < 0 )
1767         {
1768             *pi_chunk = 0;
1769             *pi_sample= 0;
1770
1771             return VLC_SUCCESS;
1772         }
1773         /* to track time scale */
1774         i_start  = i_start * p_track->i_timescale / (int64_t)1000000;
1775         /* add elst offset */
1776         if( ( elst->i_media_rate_integer[p_track->i_elst] > 0 ||
1777              elst->i_media_rate_fraction[p_track->i_elst] > 0 ) &&
1778             elst->i_media_time[p_track->i_elst] > 0 )
1779         {
1780             i_start += elst->i_media_time[p_track->i_elst];
1781         }
1782
1783         msg_Dbg( p_demux, "elst (%d) gives %"PRId64"ms (movie)-> %"PRId64
1784                  "ms (track)", p_track->i_elst,
1785                  i_mvt * 1000 / p_sys->i_timescale,
1786                  i_start * 1000 / p_track->i_timescale );
1787     }
1788     else
1789     {
1790         /* convert absolute time to in timescale unit */
1791         i_start = i_start * p_track->i_timescale / (int64_t)1000000;
1792     }
1793
1794     /* we start from sample 0/chunk 0, hope it won't take too much time */
1795     /* *** find good chunk *** */
1796     for( i_chunk = 0; ; i_chunk++ )
1797     {
1798         if( i_chunk + 1 >= p_track->i_chunk_count )
1799         {
1800             /* at the end and can't check if i_start in this chunk,
1801                it will be check while searching i_sample */
1802             i_chunk = p_track->i_chunk_count - 1;
1803             break;
1804         }
1805
1806         if( (uint64_t)i_start >= p_track->chunk[i_chunk].i_first_dts &&
1807             (uint64_t)i_start <  p_track->chunk[i_chunk + 1].i_first_dts )
1808         {
1809             break;
1810         }
1811     }
1812
1813     /* *** find sample in the chunk *** */
1814     i_sample = p_track->chunk[i_chunk].i_sample_first;
1815     i_dts    = p_track->chunk[i_chunk].i_first_dts;
1816     for( i_index = 0; i_sample < p_track->chunk[i_chunk].i_sample_count; )
1817     {
1818         if( i_dts +
1819             p_track->chunk[i_chunk].p_sample_count_dts[i_index] *
1820             p_track->chunk[i_chunk].p_sample_delta_dts[i_index] < (uint64_t)i_start )
1821         {
1822             i_dts    +=
1823                 p_track->chunk[i_chunk].p_sample_count_dts[i_index] *
1824                 p_track->chunk[i_chunk].p_sample_delta_dts[i_index];
1825
1826             i_sample += p_track->chunk[i_chunk].p_sample_count_dts[i_index];
1827             i_index++;
1828         }
1829         else
1830         {
1831             if( p_track->chunk[i_chunk].p_sample_delta_dts[i_index] <= 0 )
1832             {
1833                 break;
1834             }
1835             i_sample += ( i_start - i_dts ) /
1836                 p_track->chunk[i_chunk].p_sample_delta_dts[i_index];
1837             break;
1838         }
1839     }
1840
1841     if( i_sample >= p_track->i_sample_count )
1842     {
1843         msg_Warn( p_demux, "track[Id 0x%x] will be disabled "
1844                   "(seeking too far) chunk=%d sample=%d",
1845                   p_track->i_track_ID, i_chunk, i_sample );
1846         return( VLC_EGENERIC );
1847     }
1848
1849
1850     /* *** Try to find nearest sync points *** */
1851     if( ( p_stss = MP4_BoxGet( p_track->p_stbl, "stss" ) ) )
1852     {
1853         unsigned int i_index;
1854         msg_Dbg( p_demux,
1855                     "track[Id 0x%x] using Sync Sample Box (stss)",
1856                     p_track->i_track_ID );
1857         for( i_index = 0; i_index < p_stss->data.p_stss->i_entry_count; i_index++ )
1858         {
1859             if( p_stss->data.p_stss->i_sample_number[i_index] >= i_sample )
1860             {
1861                 if( i_index > 0 )
1862                 {
1863                     msg_Dbg( p_demux, "stts gives %d --> %d (sample number)",
1864                             i_sample,
1865                             p_stss->data.p_stss->i_sample_number[i_index-1] );
1866                     i_sample = p_stss->data.p_stss->i_sample_number[i_index-1];
1867                     /* new i_sample is less than old so i_chunk can only decreased */
1868                     while( i_chunk > 0 &&
1869                             i_sample < p_track->chunk[i_chunk].i_sample_first )
1870                     {
1871                         i_chunk--;
1872                     }
1873                 }
1874                 else
1875                 {
1876                     msg_Dbg( p_demux, "stts gives %d --> %d (sample number)",
1877                             i_sample,
1878                             p_stss->data.p_stss->i_sample_number[i_index] );
1879                     i_sample = p_stss->data.p_stss->i_sample_number[i_index];
1880                     /* new i_sample is more than old so i_chunk can only increased */
1881                     while( i_chunk < p_track->i_chunk_count - 1 &&
1882                            i_sample >= p_track->chunk[i_chunk].i_sample_first +
1883                              p_track->chunk[i_chunk].i_sample_count )
1884                     {
1885                         i_chunk++;
1886                     }
1887                 }
1888                 break;
1889             }
1890         }
1891     }
1892     else
1893     {
1894         msg_Dbg( p_demux, "track[Id 0x%x] does not provide Sync "
1895                  "Sample Box (stss)", p_track->i_track_ID );
1896     }
1897
1898     *pi_chunk  = i_chunk;
1899     *pi_sample = i_sample;
1900
1901     return VLC_SUCCESS;
1902 }
1903
1904 static int TrackGotoChunkSample( demux_t *p_demux, mp4_track_t *p_track,
1905                                  unsigned int i_chunk, unsigned int i_sample )
1906 {
1907     bool b_reselect = false;
1908
1909     /* now see if actual es is ok */
1910     if( (p_track->i_chunk >= p_track->i_chunk_count - 1) ||
1911         (p_track->chunk[p_track->i_chunk].i_sample_description_index !=
1912             p_track->chunk[i_chunk].i_sample_description_index) )
1913     {
1914         msg_Warn( p_demux, "recreate ES for track[Id 0x%x]",
1915                   p_track->i_track_ID );
1916
1917         es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
1918                         p_track->p_es, &b_reselect );
1919
1920         es_out_Del( p_demux->out, p_track->p_es );
1921
1922         p_track->p_es = NULL;
1923
1924         if( TrackCreateES( p_demux, p_track, i_chunk, &p_track->p_es ) )
1925         {
1926             msg_Err( p_demux, "cannot create es for track[Id 0x%x]",
1927                      p_track->i_track_ID );
1928
1929             p_track->b_ok       = false;
1930             p_track->b_selected = false;
1931             return VLC_EGENERIC;
1932         }
1933     }
1934
1935     /* select again the new decoder */
1936     if( b_reselect )
1937     {
1938         es_out_Control( p_demux->out, ES_OUT_SET_ES, p_track->p_es );
1939     }
1940
1941     p_track->i_chunk    = i_chunk;
1942     p_track->i_sample   = i_sample;
1943
1944     return p_track->b_selected ? VLC_SUCCESS : VLC_EGENERIC;
1945 }
1946
1947 /****************************************************************************
1948  * MP4_TrackCreate:
1949  ****************************************************************************
1950  * Parse track information and create all needed data to run a track
1951  * If it succeed b_ok is set to 1 else to 0
1952  ****************************************************************************/
1953 static void MP4_TrackCreate( demux_t *p_demux, mp4_track_t *p_track,
1954                              MP4_Box_t *p_box_trak )
1955 {
1956     demux_sys_t *p_sys = p_demux->p_sys;
1957
1958     MP4_Box_t *p_tkhd = MP4_BoxGet( p_box_trak, "tkhd" );
1959     MP4_Box_t *p_tref = MP4_BoxGet( p_box_trak, "tref" );
1960     MP4_Box_t *p_elst;
1961
1962     MP4_Box_t *p_mdhd;
1963     MP4_Box_t *p_udta;
1964     MP4_Box_t *p_hdlr;
1965
1966     MP4_Box_t *p_vmhd;
1967     MP4_Box_t *p_smhd;
1968
1969     MP4_Box_t *p_drms;
1970
1971     unsigned int i;
1972     char language[4];
1973
1974     /* hint track unsupported */
1975
1976     /* set default value (-> track unusable) */
1977     p_track->b_ok       = false;
1978     p_track->b_enable   = false;
1979     p_track->b_selected = false;
1980     p_track->b_chapter  = false;
1981
1982     es_format_Init( &p_track->fmt, UNKNOWN_ES, 0 );
1983
1984     if( !p_tkhd )
1985     {
1986         return;
1987     }
1988
1989     /* do we launch this track by default ? */
1990     p_track->b_enable =
1991         ( ( p_tkhd->data.p_tkhd->i_flags&MP4_TRACK_ENABLED ) != 0 );
1992     if( !p_track->b_enable )
1993         p_track->fmt.i_priority = -1;
1994
1995     p_track->i_track_ID = p_tkhd->data.p_tkhd->i_track_ID;
1996     p_track->i_width = p_tkhd->data.p_tkhd->i_width / 65536;
1997     p_track->i_height = p_tkhd->data.p_tkhd->i_height / 65536;
1998
1999     if( p_tref )
2000     {
2001 /*        msg_Warn( p_demux, "unhandled box: tref --> FIXME" ); */
2002     }
2003
2004     p_mdhd = MP4_BoxGet( p_box_trak, "mdia/mdhd" );
2005     p_hdlr = MP4_BoxGet( p_box_trak, "mdia/hdlr" );
2006
2007     if( ( !p_mdhd )||( !p_hdlr ) )
2008     {
2009         return;
2010     }
2011
2012     p_track->i_timescale = p_mdhd->data.p_mdhd->i_timescale;
2013     if( !p_track->i_timescale )
2014         return;
2015
2016     for( i = 0; i < 3; i++ )
2017     {
2018         language[i] = p_mdhd->data.p_mdhd->i_language[i];
2019     }
2020     language[3] = '\0';
2021
2022     switch( p_hdlr->data.p_hdlr->i_handler_type )
2023     {
2024         case( FOURCC_soun ):
2025             if( !( p_smhd = MP4_BoxGet( p_box_trak, "mdia/minf/smhd" ) ) )
2026             {
2027                 return;
2028             }
2029             p_track->fmt.i_cat = AUDIO_ES;
2030             break;
2031
2032         case( FOURCC_vide ):
2033             if( !( p_vmhd = MP4_BoxGet( p_box_trak, "mdia/minf/vmhd" ) ) )
2034             {
2035                 return;
2036             }
2037             p_track->fmt.i_cat = VIDEO_ES;
2038             break;
2039
2040         case( FOURCC_text ):
2041         case( FOURCC_subp ):
2042         case( FOURCC_tx3g ):
2043             p_track->fmt.i_cat = SPU_ES;
2044             break;
2045
2046         default:
2047             return;
2048     }
2049
2050     p_track->i_elst = 0;
2051     p_track->i_elst_time = 0;
2052     if( ( p_track->p_elst = p_elst = MP4_BoxGet( p_box_trak, "edts/elst" ) ) )
2053     {
2054         MP4_Box_data_elst_t *elst = p_elst->data.p_elst;
2055         unsigned int i;
2056
2057         msg_Warn( p_demux, "elst box found" );
2058         for( i = 0; i < elst->i_entry_count; i++ )
2059         {
2060             msg_Dbg( p_demux, "   - [%d] duration=%"PRId64"ms media time=%"PRId64
2061                      "ms) rate=%d.%d", i,
2062                      elst->i_segment_duration[i] * 1000 / p_sys->i_timescale,
2063                      elst->i_media_time[i] >= 0 ?
2064                      (int64_t)(elst->i_media_time[i] * 1000 / p_track->i_timescale) :
2065                      INT64_C(-1),
2066                      elst->i_media_rate_integer[i],
2067                      elst->i_media_rate_fraction[i] );
2068         }
2069     }
2070
2071
2072 /*  TODO
2073     add support for:
2074     p_dinf = MP4_BoxGet( p_minf, "dinf" );
2075 */
2076     if( !( p_track->p_stbl = MP4_BoxGet( p_box_trak,"mdia/minf/stbl" ) ) ||
2077         !( p_track->p_stsd = MP4_BoxGet( p_box_trak,"mdia/minf/stbl/stsd") ) )
2078     {
2079         return;
2080     }
2081
2082     p_drms = MP4_BoxGet( p_track->p_stsd, "drms" );
2083     p_track->b_drms = p_drms != NULL;
2084     p_track->p_drms = p_track->b_drms ?
2085         p_drms->data.p_sample_soun->p_drms : NULL;
2086
2087     /* Set language */
2088     if( strcmp( language, "```" ) && strcmp( language, "und" ) )
2089     {
2090         p_track->fmt.psz_language = strdup( language );
2091     }
2092
2093     p_udta = MP4_BoxGet( p_box_trak, "udta" );
2094     if( p_udta )
2095     {
2096         MP4_Box_t *p_0xa9xxx;
2097         for( p_0xa9xxx = p_udta->p_first; p_0xa9xxx != NULL;
2098                  p_0xa9xxx = p_0xa9xxx->p_next )
2099         {
2100             switch( p_0xa9xxx->i_type )
2101             {
2102                 case FOURCC_0xa9nam:
2103                     p_track->fmt.psz_description =
2104                         strdup( p_0xa9xxx->data.p_0xa9xxx->psz_text );
2105                     break;
2106             }
2107         }
2108     }
2109
2110     /* Create chunk index table and sample index table */
2111     if( TrackCreateChunksIndex( p_demux,p_track  ) ||
2112         TrackCreateSamplesIndex( p_demux, p_track ) )
2113     {
2114         return; /* cannot create chunks index */
2115     }
2116
2117     p_track->i_chunk  = 0;
2118     p_track->i_sample = 0;
2119
2120     /* Mark chapter only track */
2121     if( !p_track->b_enable && p_sys->p_tref_chap )
2122     {
2123         MP4_Box_data_tref_generic_t *p_chap = p_sys->p_tref_chap->data.p_tref_generic;
2124         unsigned int i;
2125
2126         for( i = 0; i < p_chap->i_entry_count; i++ )
2127         {
2128             if( p_track->i_track_ID == p_chap->i_track_ID[i] )
2129             {
2130                 p_track->b_chapter = true;
2131                 break;
2132             }
2133         }
2134     }
2135
2136     /* now create es */
2137     p_track->p_es = NULL;
2138     if( TrackCreateES( p_demux,
2139                        p_track, p_track->i_chunk,
2140                        p_track->b_chapter ? NULL : &p_track->p_es ) )
2141     {
2142         msg_Err( p_demux, "cannot create es for track[Id 0x%x]",
2143                  p_track->i_track_ID );
2144         return;
2145     }
2146     p_track->b_ok = true;
2147 #if 0
2148     {
2149         int i;
2150         for( i = 0; i < p_track->i_chunk_count; i++ )
2151         {
2152             fprintf( stderr, "%-5d sample_count=%d pts=%lld\n",
2153                      i, p_track->chunk[i].i_sample_count,
2154                      p_track->chunk[i].i_first_dts );
2155
2156         }
2157     }
2158 #endif
2159 }
2160
2161 /****************************************************************************
2162  * MP4_TrackDestroy:
2163  ****************************************************************************
2164  * Destroy a track created by MP4_TrackCreate.
2165  ****************************************************************************/
2166 static void MP4_TrackDestroy( mp4_track_t *p_track )
2167 {
2168     unsigned int i_chunk;
2169
2170     p_track->b_ok = false;
2171     p_track->b_enable   = false;
2172     p_track->b_selected = false;
2173
2174     es_format_Clean( &p_track->fmt );
2175
2176     for( i_chunk = 0; i_chunk < p_track->i_chunk_count; i_chunk++ )
2177     {
2178         if( p_track->chunk )
2179         {
2180            FREENULL(p_track->chunk[i_chunk].p_sample_count_dts);
2181            FREENULL(p_track->chunk[i_chunk].p_sample_delta_dts );
2182
2183            FREENULL(p_track->chunk[i_chunk].p_sample_count_pts);
2184            FREENULL(p_track->chunk[i_chunk].p_sample_offset_pts );
2185         }
2186     }
2187     FREENULL( p_track->chunk );
2188
2189     if( !p_track->i_sample_size )
2190     {
2191         FREENULL( p_track->p_sample_size );
2192     }
2193 }
2194
2195 static int MP4_TrackSelect( demux_t *p_demux, mp4_track_t *p_track,
2196                             mtime_t i_start )
2197 {
2198     if( !p_track->b_ok || p_track->b_chapter )
2199     {
2200         return VLC_EGENERIC;
2201     }
2202
2203     if( p_track->b_selected )
2204     {
2205         msg_Warn( p_demux, "track[Id 0x%x] already selected",
2206                   p_track->i_track_ID );
2207         return VLC_SUCCESS;
2208     }
2209
2210     return MP4_TrackSeek( p_demux, p_track, i_start );
2211 }
2212
2213 static void MP4_TrackUnselect( demux_t *p_demux, mp4_track_t *p_track )
2214 {
2215     if( !p_track->b_ok || p_track->b_chapter )
2216     {
2217         return;
2218     }
2219
2220     if( !p_track->b_selected )
2221     {
2222         msg_Warn( p_demux, "track[Id 0x%x] already unselected",
2223                   p_track->i_track_ID );
2224         return;
2225     }
2226     if( p_track->p_es )
2227     {
2228         es_out_Control( p_demux->out, ES_OUT_SET_ES_STATE,
2229                         p_track->p_es, false );
2230     }
2231
2232     p_track->b_selected = false;
2233 }
2234
2235 static int MP4_TrackSeek( demux_t *p_demux, mp4_track_t *p_track,
2236                           mtime_t i_start )
2237 {
2238     uint32_t i_chunk;
2239     uint32_t i_sample;
2240
2241     if( !p_track->b_ok || p_track->b_chapter )
2242         return VLC_EGENERIC;
2243
2244     p_track->b_selected = false;
2245
2246     if( TrackTimeToSampleChunk( p_demux, p_track, i_start,
2247                                 &i_chunk, &i_sample ) )
2248     {
2249         msg_Warn( p_demux, "cannot select track[Id 0x%x]",
2250                   p_track->i_track_ID );
2251         return VLC_EGENERIC;
2252     }
2253
2254     p_track->b_selected = true;
2255
2256     if( TrackGotoChunkSample( p_demux, p_track, i_chunk, i_sample ) ==
2257         VLC_SUCCESS )
2258     {
2259         p_track->b_selected = true;
2260
2261         es_out_Control( p_demux->out, ES_OUT_SET_NEXT_DISPLAY_TIME,
2262                         p_track->p_es, i_start );
2263     }
2264
2265     return p_track->b_selected ? VLC_SUCCESS : VLC_EGENERIC;
2266 }
2267
2268
2269 /*
2270  * 3 types: for audio
2271  *
2272  */
2273 #define QT_V0_MAX_SAMPLES 1024
2274 static int MP4_TrackSampleSize( mp4_track_t *p_track )
2275 {
2276     int i_size;
2277     MP4_Box_data_sample_soun_t *p_soun;
2278
2279     if( p_track->i_sample_size == 0 )
2280     {
2281         /* most simple case */
2282         return p_track->p_sample_size[p_track->i_sample];
2283     }
2284     if( p_track->fmt.i_cat != AUDIO_ES )
2285     {
2286         return p_track->i_sample_size;
2287     }
2288
2289     p_soun = p_track->p_sample->data.p_sample_soun;
2290
2291     if( p_soun->i_qt_version == 1 )
2292     {
2293         i_size = p_track->chunk[p_track->i_chunk].i_sample_count /
2294             p_soun->i_sample_per_packet * p_soun->i_bytes_per_frame;
2295     }
2296     else if( p_track->i_sample_size > 256 )
2297     {
2298         /* We do that so we don't read too much data
2299          * (in this case we are likely dealing with compressed data) */
2300         i_size = p_track->i_sample_size;
2301     }
2302     else
2303     {
2304         /* Read a bunch of samples at once */
2305         int i_samples = p_track->chunk[p_track->i_chunk].i_sample_count -
2306             ( p_track->i_sample -
2307               p_track->chunk[p_track->i_chunk].i_sample_first );
2308
2309         i_samples = __MIN( QT_V0_MAX_SAMPLES, i_samples );
2310         i_size = i_samples * p_track->i_sample_size;
2311     }
2312
2313     //fprintf( stderr, "size=%d\n", i_size );
2314     return i_size;
2315 }
2316
2317 static uint64_t MP4_TrackGetPos( mp4_track_t *p_track )
2318 {
2319     unsigned int i_sample;
2320     uint64_t i_pos;
2321
2322     i_pos = p_track->chunk[p_track->i_chunk].i_offset;
2323
2324     if( p_track->i_sample_size )
2325     {
2326         MP4_Box_data_sample_soun_t *p_soun =
2327             p_track->p_sample->data.p_sample_soun;
2328
2329         if( p_soun->i_qt_version == 0 )
2330         {
2331             i_pos += ( p_track->i_sample -
2332                        p_track->chunk[p_track->i_chunk].i_sample_first ) *
2333                      p_track->i_sample_size;
2334         }
2335         else
2336         {
2337             /* we read chunk by chunk */
2338             i_pos += 0;
2339         }
2340     }
2341     else
2342     {
2343         for( i_sample = p_track->chunk[p_track->i_chunk].i_sample_first;
2344              i_sample < p_track->i_sample; i_sample++ )
2345         {
2346             i_pos += p_track->p_sample_size[i_sample];
2347         }
2348     }
2349
2350     return i_pos;
2351 }
2352
2353 static int MP4_TrackNextSample( demux_t *p_demux, mp4_track_t *p_track )
2354 {
2355     if( p_track->fmt.i_cat == AUDIO_ES && p_track->i_sample_size != 0 )
2356     {
2357         MP4_Box_data_sample_soun_t *p_soun;
2358
2359         p_soun = p_track->p_sample->data.p_sample_soun;
2360
2361         if( p_soun->i_qt_version == 1 )
2362         {
2363             /* chunk by chunk */
2364             p_track->i_sample =
2365                 p_track->chunk[p_track->i_chunk].i_sample_first +
2366                 p_track->chunk[p_track->i_chunk].i_sample_count;
2367         }
2368         else if( p_track->i_sample_size > 256 )
2369         {
2370             /* We do that so we don't read too much data
2371              * (in this case we are likely dealing with compressed data) */
2372             p_track->i_sample += 1;
2373         }
2374         else
2375         {
2376             /* FIXME */
2377             p_track->i_sample += QT_V0_MAX_SAMPLES;
2378             if( p_track->i_sample >
2379                 p_track->chunk[p_track->i_chunk].i_sample_first +
2380                 p_track->chunk[p_track->i_chunk].i_sample_count )
2381             {
2382                 p_track->i_sample =
2383                     p_track->chunk[p_track->i_chunk].i_sample_first +
2384                     p_track->chunk[p_track->i_chunk].i_sample_count;
2385             }
2386         }
2387     }
2388     else
2389     {
2390         p_track->i_sample++;
2391     }
2392
2393     if( p_track->i_sample >= p_track->i_sample_count )
2394         return VLC_EGENERIC;
2395
2396     /* Have we changed chunk ? */
2397     if( p_track->i_sample >=
2398             p_track->chunk[p_track->i_chunk].i_sample_first +
2399             p_track->chunk[p_track->i_chunk].i_sample_count )
2400     {
2401         if( TrackGotoChunkSample( p_demux, p_track, p_track->i_chunk + 1,
2402                                   p_track->i_sample ) )
2403         {
2404             msg_Warn( p_demux, "track[0x%x] will be disabled "
2405                       "(cannot restart decoder)", p_track->i_track_ID );
2406             MP4_TrackUnselect( p_demux, p_track );
2407             return VLC_EGENERIC;
2408         }
2409     }
2410
2411     /* Have we changed elst */
2412     if( p_track->p_elst && p_track->p_elst->data.p_elst->i_entry_count > 0 )
2413     {
2414         demux_sys_t *p_sys = p_demux->p_sys;
2415         MP4_Box_data_elst_t *elst = p_track->p_elst->data.p_elst;
2416         uint64_t i_mvt = MP4_TrackGetDTS( p_demux, p_track ) *
2417                         p_sys->i_timescale / (int64_t)1000000;
2418
2419         if( (unsigned int)p_track->i_elst < elst->i_entry_count &&
2420             i_mvt >= p_track->i_elst_time +
2421                      elst->i_segment_duration[p_track->i_elst] )
2422         {
2423             MP4_TrackSetELST( p_demux, p_track,
2424                               MP4_TrackGetDTS( p_demux, p_track ) );
2425         }
2426     }
2427
2428     return VLC_SUCCESS;
2429 }
2430
2431 static void MP4_TrackSetELST( demux_t *p_demux, mp4_track_t *tk,
2432                               int64_t i_time )
2433 {
2434     demux_sys_t *p_sys = p_demux->p_sys;
2435     int         i_elst_last = tk->i_elst;
2436
2437     /* handle elst (find the correct one) */
2438     tk->i_elst      = 0;
2439     tk->i_elst_time = 0;
2440     if( tk->p_elst && tk->p_elst->data.p_elst->i_entry_count > 0 )
2441     {
2442         MP4_Box_data_elst_t *elst = tk->p_elst->data.p_elst;
2443         int64_t i_mvt= i_time * p_sys->i_timescale / (int64_t)1000000;
2444
2445         for( tk->i_elst = 0; (unsigned int)tk->i_elst < elst->i_entry_count; tk->i_elst++ )
2446         {
2447             mtime_t i_dur = elst->i_segment_duration[tk->i_elst];
2448
2449             if( tk->i_elst_time <= i_mvt && i_mvt < tk->i_elst_time + i_dur )
2450             {
2451                 break;
2452             }
2453             tk->i_elst_time += i_dur;
2454         }
2455
2456         if( (unsigned int)tk->i_elst >= elst->i_entry_count )
2457         {
2458             /* msg_Dbg( p_demux, "invalid number of entry in elst" ); */
2459             tk->i_elst = elst->i_entry_count - 1;
2460             tk->i_elst_time -= elst->i_segment_duration[tk->i_elst];
2461         }
2462
2463         if( elst->i_media_time[tk->i_elst] < 0 )
2464         {
2465             /* track offset */
2466             tk->i_elst_time += elst->i_segment_duration[tk->i_elst];
2467         }
2468     }
2469     if( i_elst_last != tk->i_elst )
2470     {
2471         msg_Warn( p_demux, "elst old=%d new=%d", i_elst_last, tk->i_elst );
2472     }
2473 }