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 VideoLAN
   5  * $Id: mp4.c,v 1.8 2002/11/28 16:32:29 fenrir Exp $
   6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26 #include <stdlib.h>                                      /* malloc(), free() */
  27 #include <string.h>                                              /* strdup() */
  28 #include <errno.h>
  29 #include <sys/types.h>
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc/input.h>
  33 #include "codecs.h"
  34 #include "libmp4.h"
  35 #include "mp4.h"
  36
  37 /*****************************************************************************
  38  * Local prototypes
  39  *****************************************************************************/
  40 static int    MP4Init    ( vlc_object_t * );
  41 static void __MP4End     ( vlc_object_t * );
  42 static int    MP4Demux   ( input_thread_t * );
  43
  44 /* New input could have something like that... */
  45 static int   MP4Seek     ( input_thread_t *, mtime_t );
  46
  47 #define MP4End(a) __MP4End(VLC_OBJECT(a))
  48
  49 /*****************************************************************************
  50  * Module descriptor
  51  *****************************************************************************/
  52 vlc_module_begin();
  53     set_description( "MP4 demuxer" );
  54     set_capability( "demux", 242 );
  55     set_callbacks( MP4Init, __MP4End );
  56 vlc_module_end();
  57
  58 /*****************************************************************************
  59  * Declaration of local function
  60  *****************************************************************************/
  61
  62 static int MP4_TrackSynchro( input_thread_t *p_input, track_data_mp4_t *p_track );
  63
  64 static void MP4_ParseTrack();
  65
  66 static int MP4_CreateChunksIndex();
  67 static int MP4_CreateSamplesIndex();
  68
  69 static void MP4_StartDecoder();
  70 static void MP4_StopDecoder();
  71
  72 static int  MP4_ReadSample();
  73 static int  MP4_DecodeSample();
  74
  75 #define MP4_Set4BytesLE( p, dw ) \
  76     *((uint8_t*)p)   = ( (dw)&0xff ); \
  77     *((uint8_t*)p+1) = ( ((dw)>> 8)&0xff ); \
  78     *((uint8_t*)p+2) = ( ((dw)>>16)&0xff ); \
  79     *((uint8_t*)p+3) = ( ((dw)>>24)&0xff )
  80
  81 #define MP4_Set2BytesLE( p, dw ) \
  82     *((uint8_t*)p) = ( (dw)&0xff ); \
  83     *((uint8_t*)p+1) = ( ((dw)>> 8)&0xff )
  84
  85
  86 /*****************************************************************************
  87  * MP4Init: check file and initializes MP4 structures
  88  *****************************************************************************/
  89 static int MP4Init( vlc_object_t * p_this )
  90 {
  91     input_thread_t  *p_input = (input_thread_t *)p_this;
  92     uint8_t         *p_peek;
  93
  94     demux_sys_t     *p_demux;
  95
  96     MP4_Box_t       *p_ftyp;
  97
  98
  99     MP4_Box_t       *p_mvhd;
 100     MP4_Box_t       *p_trak;
 101
 102     int             i;
 103     /* I need to seek */
 104     if( !p_input->stream.b_seekable )
 105     {
 106         msg_Warn( p_input, "MP4 plugin discarded (unseekable)" );
 107         return( -1 );
 108
 109     }
 110     /* Initialize access plug-in structures. */
 111     if( p_input->i_mtu == 0 )
 112     {
 113         /* Improve speed. */
 114         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE ;
 115     }
 116
 117     p_input->pf_demux = MP4Demux;
 118
 119     /* a little test to see if it could be a mp4 */
 120     if( input_Peek( p_input, &p_peek, 8 ) < 8 )
 121     {
 122         msg_Warn( p_input, "MP4 plugin discarded (cannot peek)" );
 123         return( -1 );
 124     }
 125
 126
 127     switch( VLC_FOURCC( p_peek[4], p_peek[5], p_peek[6], p_peek[7] ) )
 128     {
 129         case( FOURCC_ftyp ):
 130         case( FOURCC_moov ):
 131         case( FOURCC_moof ):
 132         case( FOURCC_mdat ):
 133         case( FOURCC_udta ):
 134         case( FOURCC_free ):
 135         case( FOURCC_skip ):
 136         case( FOURCC_wide ):
 137             break;
 138          default:
 139             msg_Warn( p_input, "MP4 plugin discarded (not a valid file)" );
 140             return( -1 );
 141     }
 142
 143     /* create our structure that will contains all data */
 144     if( !( p_input->p_demux_data =
 145                 p_demux = malloc( sizeof( demux_sys_t ) ) ) )
 146     {
 147         msg_Err( p_input, "out of memory" );
 148         return( -1 );
 149     }
 150     memset( p_demux, 0, sizeof( demux_sys_t ) );
 151     p_input->p_demux_data = p_demux;
 152
 153
 154     /* Now load all boxes ( except raw data ) */
 155     if( !MP4_BoxGetRoot( p_input, &p_demux->box_root ) )
 156     {
 157         msg_Warn( p_input, "MP4 plugin discarded (not a valid file)" );
 158         return( -1 );
 159     }
 160
 161     MP4_BoxDumpStructure( p_input, &p_demux->box_root );
 162
 163     if( ( p_ftyp = MP4_BoxGet( &p_demux->box_root, "/ftyp" ) ) )
 164     {
 165         switch( p_ftyp->data.p_ftyp->i_major_brand )
 166         {
 167             case( FOURCC_isom ):
 168                 msg_Info( p_input,
 169                           "ISO Media file (isom) version %d.",
 170                           p_ftyp->data.p_ftyp->i_minor_version );
 171                 break;
 172             default:
 173                 msg_Info( p_input,
 174                           "Unrecognize major file specification (%c%c%c%c).",
 175                            p_ftyp->data.p_ftyp->i_major_brand&0xff,
 176                            ( p_ftyp->data.p_ftyp->i_major_brand >>  8)&0xff,
 177                            ( p_ftyp->data.p_ftyp->i_major_brand >> 16 )&0xff,
 178                            ( p_ftyp->data.p_ftyp->i_major_brand >> 24 )&0xff );
 179                 break;
 180         }
 181     }
 182     else
 183     {
 184         msg_Info( p_input, "File Type box missing(assume ISO Media file)" );
 185     }
 186
 187     /* the file need to have one moov box */
 188     if( MP4_BoxCount( &p_demux->box_root, "/moov" ) != 1 )
 189     {
 190         msg_Err( p_input,
 191                  "MP4 plugin discarded (%d moov box)",
 192                  MP4_BoxCount( &p_demux->box_root, "/moov" ) );
 193         MP4End( p_input );
 194         return( -1 );
 195     }
 196
 197     if( !(p_mvhd = MP4_BoxGet( &p_demux->box_root, "/moov/mvhd" ) ) )
 198     {
 199         msg_Err( p_input, "cannot find /moov/mvhd !" );
 200         MP4End( p_input );
 201         return( -1 );
 202     }
 203     else
 204     {
 205         p_demux->i_timescale = p_mvhd->data.p_mvhd->i_timescale;
 206         p_demux->i_duration = p_mvhd->data.p_mvhd->i_duration;
 207     }
 208
 209     if( !( p_demux->i_tracks =
 210                 MP4_BoxCount( &p_demux->box_root, "/moov/trak" ) ) )
 211     {
 212         msg_Err( p_input, "cannot find any /moov/trak !" );
 213         MP4End( p_input );
 214         return( -1 );
 215     }
 216     msg_Dbg( p_input, "find %d track%c",
 217                         p_demux->i_tracks,
 218                         p_demux->i_tracks ? 's':' ' );
 219
 220     /* allocate memory */
 221     p_demux->track = calloc( p_demux->i_tracks, sizeof( track_data_mp4_t ) );
 222
 223     /* now process each track and extract all usefull informations */
 224     for( i = 0; i < p_demux->i_tracks; i++ )
 225     {
 226         p_trak = MP4_BoxGet( &p_demux->box_root, "/moov/trak[%d]", i );
 227         MP4_ParseTrack( p_input, &p_demux->track[i], p_trak );
 228
 229         if( p_demux->track[i].b_ok )
 230         {
 231             char *psz_cat;
 232             switch( p_demux->track[i].i_cat )
 233             {
 234                 case( VIDEO_ES ):
 235                     psz_cat = "video";
 236                     break;
 237                 case( AUDIO_ES ):
 238                     psz_cat = "audio";
 239                     break;
 240                 default:
 241                     psz_cat = "unknown";
 242                     break;
 243             }
 244
 245             msg_Dbg( p_input, "adding track[Id 0x%x] %s (%s) language %c%c%c",
 246                             p_demux->track[i].i_track_ID,
 247                             psz_cat,
 248                             p_demux->track[i].b_enable ? "enable":"disable",
 249                             p_demux->track[i].i_language[0],
 250                             p_demux->track[i].i_language[1],
 251                             p_demux->track[i].i_language[2] );
 252         }
 253         else
 254         {
 255             msg_Dbg( p_input, "ignoring track[Id 0x%x]", p_demux->track[i].i_track_ID );
 256         }
 257
 258     }
 259
 260     /*  create one program */
 261     vlc_mutex_lock( &p_input->stream.stream_lock );
 262     if( input_InitStream( p_input, 0 ) == -1)
 263     {
 264         vlc_mutex_unlock( &p_input->stream.stream_lock );
 265         msg_Err( p_input, "cannot init stream" );
 266         MP4End( p_input );
 267         return( -1 );
 268     }
 269     if( input_AddProgram( p_input, 0, 0) == NULL )
 270     {
 271         vlc_mutex_unlock( &p_input->stream.stream_lock );
 272         msg_Err( p_input, "cannot add program" );
 273         MP4End( p_input );
 274         return( -1 );
 275     }
 276     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 277     /* XXX beurk and beurk, see MP4Demux and MP4Seek */
 278     if( p_demux->i_duration/p_demux->i_timescale > 0 )
 279     {
 280         p_input->stream.i_mux_rate =
 281             p_input->stream.p_selected_area->i_size / 50 /
 282             ( p_demux->i_duration / p_demux->i_timescale );
 283     }
 284     else
 285     {
 286         p_input->stream.i_mux_rate = 0;
 287     }
 288     vlc_mutex_unlock( &p_input->stream.stream_lock );
 289
 290
 291     for( i = 0; i < p_demux->i_tracks; i++ )
 292     {
 293         /* start decoder for this track if enable by default*/
 294         if( p_demux->track[i].b_enable )
 295         {
 296             MP4_StartDecoder( p_input, &p_demux->track[i] );
 297         }
 298     }
 299
 300     vlc_mutex_lock( &p_input->stream.stream_lock );
 301     p_input->stream.p_selected_program->b_is_ok = 1;
 302     vlc_mutex_unlock( &p_input->stream.stream_lock );
 303
 304     return( 0 );
 305
 306 }
 307
 308 /*****************************************************************************
 309  * MP4Demux: read packet and send them to decoders
 310  *****************************************************************************
 311  * TODO check for newly selected track (ie audio upt to now )
 312  *****************************************************************************/
 313 static int MP4Demux( input_thread_t *p_input )
 314 {
 315     demux_sys_t *p_demux = p_input->p_demux_data;
 316     int i_track;
 317
 318     /* XXX beurk, beuRK and BEURK,
 319        but only way I've found to detect seek from interface */
 320     if( p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT )
 321     {
 322         mtime_t i_date;
 323
 324         /* first wait for empty buffer, arbitrary time FIXME */
 325         msleep( DEFAULT_PTS_DELAY );
 326         /* *** calculate new date *** */
 327
 328         i_date = (mtime_t)1000000 *
 329                  (mtime_t)p_demux->i_duration /
 330                  (mtime_t)p_demux->i_timescale *
 331                  (mtime_t)MP4_TellAbsolute( p_input ) /
 332                  (mtime_t)p_input->stream.p_selected_area->i_size;
 333         MP4Seek( p_input, i_date );
 334     }
 335
 336     /* first wait for the good time to read a packet */
 337     input_ClockManageRef( p_input,
 338                           p_input->stream.p_selected_program,
 339                           p_demux->i_pcr );
 340
 341
 342     /* update pcr XXX in mpeg scale so in 90000 unit/s */
 343     p_demux->i_pcr = MP4_GetMoviePTS( p_demux ) * 9 / 100;
 344
 345
 346     /* we will read 100ms for each stream so ...*/
 347     p_demux->i_time += __MAX( p_demux->i_timescale / 10 , 1 );
 348
 349
 350     for( i_track = 0; i_track < p_demux->i_tracks; i_track++ )
 351     {
 352         if( ( !p_demux->track[i_track].b_ok )||
 353             ( !p_demux->track[i_track].p_es )||
 354             ( !p_demux->track[i_track].p_es->p_decoder_fifo )||
 355             ( MP4_GetTrackPTS( &p_demux->track[i_track] ) >=
 356                         MP4_GetMoviePTS( p_demux ) ) )
 357         {
 358             continue; /* no need to read something */
 359         }
 360         while( MP4_GetTrackPTS( &p_demux->track[i_track] ) <
 361                         MP4_GetMoviePTS( p_demux ) )
 362         {
 363
 364             pes_packet_t *p_pes;
 365
 366             /* read a sample */
 367             if( !MP4_ReadSample( p_input ,
 368                                  &p_demux->track[i_track],
 369                                  &p_pes ) )
 370             {
 371                 break;
 372             }
 373
 374             /* send it to decoder and update time of this track
 375                  it also launch a new decoder if needed */
 376             MP4_DecodeSample( p_input ,
 377                               &p_demux->track[i_track],
 378                               p_pes );
 379         }
 380
 381     }
 382
 383     /* now check if all tracks are finished or unhandled*/
 384
 385     for( i_track = 0; i_track < p_demux->i_tracks; i_track++ )
 386     {
 387         if( ( p_demux->track[i_track].b_ok )&&
 388             ( p_demux->track[i_track].i_sample < p_demux->track[i_track].i_sample_count )&&
 389             ( p_demux->track[i_track].p_es )&&
 390             ( p_demux->track[i_track].p_es->p_decoder_fifo ) )
 391         {
 392             return( 1 );
 393         }
 394     }
 395
 396     return( 0 ); /* EOF */
 397 }
 398 /*****************************************************************************
 399  * MP4Seek: Got to i_date
 400  ******************************************************************************/
 401 static int   MP4Seek     ( input_thread_t *p_input, mtime_t i_date )
 402 {
 403     demux_sys_t *p_demux = p_input->p_demux_data;
 404     int i_track;
 405
 406     /* First update update global time */
 407     p_demux->i_time = i_date * p_demux->i_timescale / 1000000;
 408     p_demux->i_pcr = __MAX( MP4_GetMoviePTS( p_demux ) - DEFAULT_PTS_DELAY,
 409                             0 ) * 9 / 100;
 410
 411     /* Now for each stream try to go to this time */
 412     for( i_track = 0; i_track < p_demux->i_tracks; i_track++ )
 413     {
 414         MP4_TrackSynchro( p_input, &p_demux->track[i_track] );
 415     }
 416     return( 1 );
 417 }
 418
 419 /*****************************************************************************
 420  * MP4End: frees unused data
 421  *****************************************************************************/
 422 static void __MP4End ( vlc_object_t * p_this )
 423 {
 424 #define FREE( p ) \
 425     if( p ) { free( p ); }
 426     int i_track;
 427     input_thread_t *  p_input = (input_thread_t *)p_this;
 428     demux_sys_t *p_demux = p_input->p_demux_data;
 429
 430     msg_Dbg( p_input, "Freeing all memory" );
 431     MP4_BoxFree( p_input, &p_demux->box_root );
 432     for( i_track = 0; i_track < p_demux->i_tracks; i_track++ )
 433     {
 434         int i_chunk;
 435         for( i_chunk = 0;
 436                 i_chunk < p_demux->track[i_track].i_chunk_count; i_chunk++ )
 437         {
 438             if( p_demux->track[i_track].chunk )
 439             {
 440                FREE(p_demux->track[i_track].chunk[i_chunk].p_sample_count_dts);
 441                FREE(p_demux->track[i_track].chunk[i_chunk].p_sample_delta_dts );
 442             }
 443         }
 444
 445         if( !p_demux->track[i_track].i_sample_size )
 446         {
 447             FREE( p_demux->track[i_track].p_sample_size );
 448         }
 449     }
 450     FREE( p_demux->track );
 451 #undef FREE
 452 }
 453
 454
 455 /****************************************************************************
 456  * Local functions, specific to vlc
 457  ****************************************************************************/
 458
 459 /****************************************************************************
 460  * MP4_TrackSynchro : synchronize a track with movie time after seek or
 461  *                    for newly selected track
 462  *****************************************************************************
 463  * TODO add support of Edit List (edts/elts) and Shadow Sync Sample(stsh)
 464  ****************************************************************************/
 465 static int MP4_TrackSynchro( input_thread_t *p_input, track_data_mp4_t *p_track )
 466 {
 467     demux_sys_t *p_demux = p_input->p_demux_data;
 468     int i_chunk_last;
 469     MP4_Box_t   *p_stss;
 470
 471     if( !p_track->b_ok ||
 472         !p_track->p_es ||
 473         !p_track->p_es->p_decoder_fifo )
 474     {
 475         return( 0 );
 476     }
 477     p_track->i_sample = 0;
 478     i_chunk_last = p_track->i_chunk;
 479     p_track->i_chunk = 0;
 480     for( ;; )
 481     {
 482         if( p_track->i_sample >= p_track->i_sample_count )
 483         {
 484             msg_Warn( p_input,
 485                         "track[Id 0x%x] will be disabled (seeking too far)",
 486                         p_track->i_track_ID );
 487             MP4_StopDecoder( p_input, p_track );
 488             break;
 489         }
 490         if( MP4_GetTrackPTS( p_track ) >= MP4_GetMoviePTS( p_demux ) )
 491         {
 492             break;
 493         }
 494         /* go one sample after */
 495         p_track->i_sample++;
 496         if( p_track->i_sample >= p_track->chunk[p_track->i_chunk].i_sample_first +
 497                 p_track->chunk[p_track->i_chunk].i_sample_count )
 498         {
 499             p_track->i_chunk++;
 500         }
 501
 502     }
 503     if( p_track->i_sample >= p_track->i_sample_count )
 504     {
 505         return( 0 );
 506     }
 507
 508     /* *** Try to find nearest sync points *** */
 509     if( ( p_stss = MP4_BoxGet( p_track->p_stbl, "stss" ) ) )
 510     {
 511         int i_index;
 512         msg_Dbg( p_input,
 513                     "track[Id 0x%x] using Sync Sample Box (stss)",
 514                     p_track->i_track_ID );
 515         for( i_index = 0; i_index < p_stss->data.p_stss->i_entry_count; i_index++ )
 516         {
 517             if( p_stss->data.p_stss->i_sample_number[i_index] >= p_track->i_sample )
 518             {
 519                 if( i_index > 0 )
 520                 {
 521                     msg_Dbg( p_input, "stts gives %d --> %d (sample number)",
 522                             p_track->i_sample,
 523                             p_stss->data.p_stss->i_sample_number[i_index-1] );
 524                     p_track->i_sample = p_stss->data.p_stss->i_sample_number[i_index-1];
 525                     /* new track.i_sample is less than old so i_chunk can only decreased */
 526                     while( p_track->i_chunk > 0 &&
 527                             p_track->i_sample < p_track->chunk[p_track->i_chunk].i_sample_first )
 528                     {
 529                         p_track->i_chunk--;
 530                     }
 531                 }
 532                 else
 533                 {
 534                     msg_Dbg( p_input, "stts gives %d --> %d (sample number)",
 535                             p_track->i_sample,
 536                             p_stss->data.p_stss->i_sample_number[i_index-1] );
 537                     p_track->i_sample = p_stss->data.p_stss->i_sample_number[i_index];
 538                     /* new track.i_sample is more than old so i_chunk can only increased */
 539                     while( p_track->i_chunk < p_track->i_chunk_count - 1 &&
 540                            p_track->i_sample >= p_track->chunk[p_track->i_chunk].i_sample_first +
 541                                                 p_track->chunk[p_track->i_chunk].i_sample_count )
 542                     {
 543                         p_track->i_chunk++;
 544                     }
 545                 }
 546                 break;
 547             }
 548         }
 549     }
 550     else
 551     {
 552         msg_Dbg( p_input,
 553                     "track[Id 0x%x] doesn't provided Sync Sample Box (stss)",
 554                     p_track->i_track_ID );
 555     }
 556
 557     /* *** If i_sample_description_index has changed restart decoder *** */
 558     if( p_track->chunk[i_chunk_last].i_sample_description_index !=
 559             p_track->chunk[p_track->i_chunk].i_sample_description_index )
 560     {
 561         msg_Warn( p_input,
 562                 "SampleEntry has changed, restarting decoder" );
 563         MP4_StopDecoder( p_input, p_track );
 564         MP4_StartDecoder( p_input, p_track );
 565     }
 566     return( 1 );
 567 }
 568
 569 /****************************************************************************
 570  * Parse track information and create all needed data to run a track
 571  * If it succeed b_ok is set to 1 else to 0
 572  ****************************************************************************/
 573 static void MP4_ParseTrack( input_thread_t *p_input,
 574                      track_data_mp4_t *p_demux_track,
 575                      MP4_Box_t  * p_trak )
 576 {
 577     int i;
 578
 579     MP4_Box_t *p_tkhd = MP4_BoxGet( p_trak, "tkhd" );
 580     MP4_Box_t *p_tref = MP4_BoxGet( p_trak, "tref" );
 581     MP4_Box_t *p_elst;
 582
 583     MP4_Box_t *p_mdhd;
 584     MP4_Box_t *p_hdlr;
 585
 586     MP4_Box_t *p_vmhd;
 587     MP4_Box_t *p_smhd;
 588
 589     /* hint track unsuported */
 590
 591     /* by default, track isn't usable */
 592     p_demux_track->b_ok = 0;
 593
 594     /* by default, we don't known the categorie */
 595     p_demux_track->i_cat = UNKNOWN_ES;
 596
 597     if( !p_tkhd )
 598     {
 599         return;
 600     }
 601
 602     /* do we launch this track by default ? */
 603     p_demux_track->b_enable =
 604         ( ( p_tkhd->data.p_tkhd->i_flags&MP4_TRACK_ENABLED ) != 0 );
 605
 606     p_demux_track->i_track_ID = p_tkhd->data.p_tkhd->i_track_ID;
 607     p_demux_track->i_width = p_tkhd->data.p_tkhd->i_width / 65536;
 608     p_demux_track->i_height = p_tkhd->data.p_tkhd->i_height / 65536;
 609
 610     if( ( p_elst = MP4_BoxGet( p_trak, "edts/elst" ) ) )
 611     {
 612 /*        msg_Warn( p_input, "Unhandled box: edts --> FIXME" ); */
 613     }
 614
 615     if( p_tref )
 616     {
 617 /*        msg_Warn( p_input, "Unhandled box: tref --> FIXME" ); */
 618     }
 619
 620     p_mdhd = MP4_BoxGet( p_trak, "mdia/mdhd" );
 621     p_hdlr = MP4_BoxGet( p_trak, "mdia/hdlr" );
 622
 623     if( ( !p_mdhd )||( !p_hdlr ) )
 624     {
 625         return;
 626     }
 627
 628     p_demux_track->i_timescale = p_mdhd->data.p_mdhd->i_timescale;
 629
 630     for( i = 0; i < 3; i++ )
 631     {
 632         p_demux_track->i_language[i] = p_mdhd->data.p_mdhd->i_language[i];
 633     }
 634     p_mdhd->data.p_mdhd->i_language[3] = 0;
 635
 636     switch( p_hdlr->data.p_hdlr->i_handler_type )
 637     {
 638         case( FOURCC_soun ):
 639             if( !( p_smhd = MP4_BoxGet( p_trak, "mdia/minf/smhd" ) ) )
 640             {
 641                 return;
 642             }
 643             p_demux_track->i_cat = AUDIO_ES;
 644             break;
 645
 646         case( FOURCC_vide ):
 647             if( !( p_vmhd = MP4_BoxGet( p_trak, "mdia/minf/vmhd" ) ) )
 648             {
 649                 return;
 650             }
 651             p_demux_track->i_cat = VIDEO_ES;
 652             break;
 653
 654         default:
 655             return;
 656     }
 657 /*  TODO
 658     add support for:
 659     p_dinf = MP4_BoxGet( p_minf, "dinf" );
 660 */
 661     if( !( p_demux_track->p_stbl = MP4_BoxGet( p_trak,"mdia/minf/stbl" ) ) )
 662     {
 663         return;
 664     }
 665
 666     if( !( p_demux_track->p_stsd = MP4_BoxGet( p_trak,"mdia/minf/stbl/stsd") ) )
 667     {
 668         return;
 669     }
 670
 671     /* Create chunk  index table */
 672     if( !MP4_CreateChunksIndex( p_input,p_demux_track  ) )
 673     {
 674         return; /* cannot create chunks index */
 675     }
 676
 677     /* create sample index table needed for reading and seeking */
 678     if( !MP4_CreateSamplesIndex( p_input, p_demux_track ) )
 679     {
 680         return; /* cannot create samples index */
 681     }
 682
 683     p_demux_track->b_ok = 1;
 684 }
 685
 686
 687
 688 /* now create basic chunk data, the rest will be filled by MP4_CreateSamplesIndex */
 689 static int MP4_CreateChunksIndex( input_thread_t *p_input,
 690                                    track_data_mp4_t *p_demux_track )
 691 {
 692     MP4_Box_t *p_co64; /* give offset for each chunk, same for stco and co64 */
 693     MP4_Box_t *p_stsc;
 694
 695     int i_chunk;
 696     int i_index, i_last;
 697
 698
 699     if( ( !(p_co64 = MP4_BoxGet( p_demux_track->p_stbl, "stco" ) )&&
 700           !(p_co64 = MP4_BoxGet( p_demux_track->p_stbl, "co64" ) ) )||
 701         ( !(p_stsc = MP4_BoxGet( p_demux_track->p_stbl, "stsc" ) ) ))
 702     {
 703         return( 0 );
 704     }
 705
 706     p_demux_track->i_chunk_count = p_co64->data.p_co64->i_entry_count;
 707     if( !p_demux_track->i_chunk_count )
 708     {
 709         msg_Warn( p_input, "No chunk defined" );
 710         return( 0 );
 711     }
 712     p_demux_track->chunk = calloc( p_demux_track->i_chunk_count,
 713                                    sizeof( chunk_data_mp4_t ) );
 714
 715     /* first we read chunk offset */
 716     for( i_chunk = 0; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
 717     {
 718         p_demux_track->chunk[i_chunk].i_offset =
 719                 p_co64->data.p_co64->i_chunk_offset[i_chunk];
 720     }
 721
 722     /* now we read index for SampleEntry( soun vide mp4a mp4v ...)
 723         to be used for the sample XXX begin to 1
 724         We construct it begining at the end */
 725     i_last = p_demux_track->i_chunk_count; /* last chunk proceded */
 726     i_index = p_stsc->data.p_stsc->i_entry_count;
 727     if( !i_index )
 728     {
 729         msg_Warn( p_input, "cannot read chunk table or table empty" );
 730         return( 0 );
 731     }
 732
 733     while( i_index )
 734     {
 735         i_index--;
 736         for( i_chunk = p_stsc->data.p_stsc->i_first_chunk[i_index] - 1;
 737                 i_chunk < i_last; i_chunk++ )
 738         {
 739             p_demux_track->chunk[i_chunk].i_sample_description_index =
 740                     p_stsc->data.p_stsc->i_sample_description_index[i_index];
 741             p_demux_track->chunk[i_chunk].i_sample_count =
 742                     p_stsc->data.p_stsc->i_samples_per_chunk[i_index];
 743         }
 744         i_last = p_stsc->data.p_stsc->i_first_chunk[i_index] - 1;
 745     }
 746
 747     p_demux_track->chunk[i_chunk].i_sample_first = 0;
 748     for( i_chunk = 1; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
 749     {
 750         p_demux_track->chunk[i_chunk].i_sample_first =
 751             p_demux_track->chunk[i_chunk-1].i_sample_first +
 752                 p_demux_track->chunk[i_chunk-1].i_sample_count;
 753
 754     }
 755
 756     msg_Dbg( p_input,
 757              "track[Id 0x%x] read %d chunk",
 758              p_demux_track->i_track_ID,
 759             p_demux_track->i_chunk_count );
 760     return( 1 );
 761
 762 }
 763
 764
 765
 766 static int MP4_CreateSamplesIndex( input_thread_t *p_input,
 767                                    track_data_mp4_t *p_demux_track )
 768 {
 769     MP4_Box_t *p_stts; /* makes mapping between sample and decoding time,
 770                           ctts make same mapping but for composition time,
 771                           not yet used and probably not usefull */
 772     MP4_Box_t *p_stsz; /* gives sample size of each samples, there is also stz2
 773                           that uses a compressed form FIXME make them in libmp4
 774                           as a unique type */
 775     /* TODO use also stss and stsh table for seeking */
 776     /* FIXME use edit table */
 777     int64_t i_sample;
 778     int64_t i_chunk;
 779
 780     int64_t i_index;
 781     int64_t i_index_sample_used;
 782
 783     int64_t i_last_dts;
 784
 785     p_stts = MP4_BoxGet( p_demux_track->p_stbl, "stts" );
 786     p_stsz = MP4_BoxGet( p_demux_track->p_stbl, "stsz" ); /* FIXME and stz2 */
 787
 788
 789     if( ( !p_stts )||( !p_stsz ) )
 790     {
 791         msg_Warn( p_input, "cannot read sample table" );
 792         return( 0 );
 793     }
 794
 795     p_demux_track->i_sample_count = p_stsz->data.p_stsz->i_sample_count;
 796
 797
 798     /* for sample size, there are 2 case */
 799     if( p_stsz->data.p_stsz->i_sample_size )
 800     {
 801         /* 1: all sample have the same size, so no need to construct a table */
 802         p_demux_track->i_sample_size = p_stsz->data.p_stsz->i_sample_size;
 803         p_demux_track->p_sample_size = NULL;
 804     }
 805     else
 806     {
 807         /* 2: each sample can have a different size */
 808         p_demux_track->i_sample_size = 0;
 809         p_demux_track->p_sample_size =
 810             calloc( p_demux_track->i_sample_count, sizeof( uint32_t ) );
 811
 812         for( i_sample = 0; i_sample < p_demux_track->i_sample_count; i_sample++ )
 813         {
 814             p_demux_track->p_sample_size[i_sample] =
 815                     p_stsz->data.p_stsz->i_entry_size[i_sample];
 816         }
 817     }
 818     /* we have extract all information from stsz,
 819         now use stts */
 820
 821     /* if we don't want to waste too much memory, we can't expand
 822        the box !, so each chunk will contain an "extract" of this table
 823        for fast research */
 824
 825     i_last_dts = 0;
 826     i_index = 0; i_index_sample_used =0;
 827
 828     /* create and init last data for each chunk */
 829     for(i_chunk = 0 ; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
 830     {
 831
 832         int64_t i_entry, i_sample_count, i;
 833         /* save last dts */
 834         p_demux_track->chunk[i_chunk].i_first_dts = i_last_dts;
 835     /* count how many entries needed for this chunk
 836        for p_sample_delta_dts and p_sample_count_dts */
 837
 838         i_sample_count = p_demux_track->chunk[i_chunk].i_sample_count;
 839
 840         i_entry = 0;
 841         while( i_sample_count > 0 )
 842         {
 843             i_sample_count -= p_stts->data.p_stts->i_sample_count[i_index+i_entry];
 844             if( i_entry == 0 )
 845             {
 846                 i_sample_count += i_index_sample_used; /* don't count already used sample
 847                                                    int this entry */
 848             }
 849             i_entry++;
 850         }
 851
 852         /* allocate them */
 853         p_demux_track->chunk[i_chunk].p_sample_count_dts =
 854             calloc( i_entry, sizeof( uint32_t ) );
 855         p_demux_track->chunk[i_chunk].p_sample_delta_dts =
 856             calloc( i_entry, sizeof( uint32_t ) );
 857
 858         /* now copy */
 859         i_sample_count = p_demux_track->chunk[i_chunk].i_sample_count;
 860         for( i = 0; i < i_entry; i++ )
 861         {
 862             int64_t i_used;
 863             int64_t i_rest;
 864
 865             i_rest = p_stts->data.p_stts->i_sample_count[i_index] - i_index_sample_used;
 866
 867             i_used = __MIN( i_rest, i_sample_count );
 868
 869             i_index_sample_used += i_used;
 870             i_sample_count -= i_used;
 871
 872             p_demux_track->chunk[i_chunk].p_sample_count_dts[i] = i_used;
 873
 874             p_demux_track->chunk[i_chunk].p_sample_delta_dts[i] =
 875                         p_stts->data.p_stts->i_sample_delta[i_index];
 876
 877             i_last_dts += i_used *
 878                     p_demux_track->chunk[i_chunk].p_sample_delta_dts[i];
 879
 880             if( i_index_sample_used >=
 881                              p_stts->data.p_stts->i_sample_count[i_index] )
 882             {
 883
 884                 i_index++;
 885                 i_index_sample_used = 0;
 886             }
 887         }
 888
 889     }
 890
 891     msg_Dbg( p_input,
 892              "track[Id 0x%x] read %d samples length:"I64Fd"s",
 893              p_demux_track->i_track_ID,
 894              p_demux_track->i_sample_count,
 895              i_last_dts / p_demux_track->i_timescale );
 896
 897     return( 1 );
 898 }
 899
 900 static void MP4_StartDecoder( input_thread_t *p_input,
 901                                  track_data_mp4_t *p_demux_track )
 902 {
 903     MP4_Box_t   *p_sample;
 904     int         i;
 905     int         i_chunk;
 906
 907     int         i_decoder_specific_info_len;
 908     uint8_t     *p_decoder_specific_info;
 909
 910     uint8_t             *p_init;
 911     BITMAPINFOHEADER    *p_bih;
 912     WAVEFORMATEX        *p_wf;
 913
 914     MP4_Box_t   *p_esds;
 915
 916
 917     if( (!p_demux_track->b_ok )||( p_demux_track->i_cat == UNKNOWN_ES ) )
 918     {
 919         return;
 920     }
 921
 922     msg_Dbg( p_input, "Starting decoder for track[Id 0x%x]",
 923                       p_demux_track->i_track_ID );
 924
 925     /* launch decoder according in chunk we are */
 926     i_chunk = p_demux_track->i_chunk;
 927
 928     if( !p_demux_track->chunk[i_chunk].i_sample_description_index )
 929     {
 930         msg_Warn( p_input,
 931                   "invalid SampleEntry index (track[Id 0x%x])",
 932                   p_demux_track->i_track_ID );
 933         return;
 934     }
 935     p_sample = MP4_BoxGet(  p_demux_track->p_stsd,
 936                             "[%d]",
 937                 p_demux_track->chunk[i_chunk].i_sample_description_index - 1 );
 938
 939     if( ( !p_sample )||( !p_sample->data.p_data ) )
 940     {
 941         msg_Warn( p_input,
 942                   "cannot find SampleEntry (track[Id 0x%x])",
 943                   p_demux_track->i_track_ID );
 944         return;
 945     }
 946
 947     vlc_mutex_lock( &p_input->stream.stream_lock );
 948     p_demux_track->p_es = input_AddES( p_input,
 949                                        p_input->stream.p_selected_program,
 950                                        p_demux_track->i_track_ID,
 951                                        0 );
 952     vlc_mutex_unlock( &p_input->stream.stream_lock );
 953     /* Initialise ES, first language as description */
 954     for( i = 0; i < 3; i++ )
 955     {
 956         p_demux_track->p_es->psz_desc[i] = p_demux_track->i_language[i];
 957     }
 958     p_demux_track->p_es->psz_desc[3] = '\0';
 959
 960     p_demux_track->p_es->i_stream_id = p_demux_track->i_track_ID;
 961
 962     /* It's a little ugly but .. there are special cases */
 963     switch( p_sample->i_type )
 964     {
 965         case( VLC_FOURCC( '.', 'm', 'p', '3' ) ):
 966         case( VLC_FOURCC( 'm', 's', 0x00, 0x55 ) ):
 967             p_demux_track->p_es->i_fourcc = VLC_FOURCC( 'm', 'p', 'g', 'a' );
 968             break;
 969         default:
 970             p_demux_track->p_es->i_fourcc = p_sample->i_type;
 971             break;
 972     }
 973
 974     p_demux_track->p_es->i_cat = p_demux_track->i_cat;
 975
 976     i_decoder_specific_info_len = 0;
 977     p_decoder_specific_info = NULL;
 978
 979     /* now see if esds is present and if so create a data packet
 980         with decoder_specific_info  */
 981 #define p_decconfig p_esds->data.p_esds->es_descriptor.p_decConfigDescr
 982     if( ( p_esds = MP4_BoxGet( p_sample, "esds" ) )&&
 983         ( p_esds->data.p_esds )&&
 984         ( p_decconfig ) )
 985     {
 986         /* First update information based on i_objectTypeIndication */
 987         switch( p_decconfig->i_objectTypeIndication )
 988         {
 989             case( 0x20 ): /* MPEG4 VIDEO */
 990                 p_demux_track->p_es->i_fourcc = VLC_FOURCC( 'm','p','4','v' );
 991                 break;
 992             case( 0x40):
 993                 p_demux_track->p_es->i_fourcc = VLC_FOURCC( 'm','p','4','a' );
 994                 break;
 995             case( 0x60):
 996             case( 0x61):
 997             case( 0x62):
 998             case( 0x63):
 999             case( 0x64):
1000             case( 0x65): /* MPEG2 video */
1001                 p_demux_track->p_es->i_fourcc = VLC_FOURCC( 'm','p','g','v' );
1002                 break;
1003             /* Theses are MPEG2-AAC */
1004             case( 0x66): /* main profile */
1005             case( 0x67): /* Low complexity profile */
1006             case( 0x68): /* Scaleable Sampling rate profile */
1007                 p_demux_track->p_es->i_fourcc = VLC_FOURCC( 'm','p','4','a' );
1008                 break;
1009             /* true MPEG 2 audio */
1010             case( 0x69):
1011                 p_demux_track->p_es->i_fourcc = VLC_FOURCC( 'm','p','g','a' );
1012                 break;
1013             case( 0x6a): /* MPEG1 video */
1014                 p_demux_track->p_es->i_fourcc = VLC_FOURCC( 'm','p','g','v' );
1015                 break;
1016             case( 0x6b): /* MPEG1 audio */
1017                 p_demux_track->p_es->i_fourcc = VLC_FOURCC( 'm','p','g','a' );
1018                 break;
1019             case( 0x6c ): /* jpeg */
1020                 p_demux_track->p_es->i_fourcc = VLC_FOURCC( 'j','p','e','g' );
1021                 break;
1022             default:
1023                 /* Unknown entry, but don't touch i_fourcc */
1024                 msg_Warn( p_input,
1025                           "objectTypeIndication(0x%x) unknow (Track[ID 0x%x])",
1026                           p_decconfig->i_objectTypeIndication,
1027                           p_demux_track->i_track_ID );
1028                 break;
1029         }
1030         i_decoder_specific_info_len =
1031                 p_decconfig->i_decoder_specific_info_len;
1032         p_decoder_specific_info =
1033                 p_decconfig->p_decoder_specific_info;
1034     }
1035
1036 #undef p_decconfig
1037
1038     /* some last initialisation */
1039     /* XXX I create a bitmapinfoheader_t or
1040        waveformatex_t for each stream, up to now it's the best thing
1041        I've found but it could exist a better solution :) as something
1042        like adding some new fields in p_es ...
1043
1044        XXX I don't set all values, only thoses that are interesting or known
1045         --> bitmapinfoheader_t : width and height
1046         --> waveformatex_t : channels, samplerate, bitspersample
1047         and at the end I add p_decoder_specific_info
1048
1049         TODO set more values
1050
1051      */
1052
1053     switch( p_demux_track->i_cat )
1054     {
1055         case( VIDEO_ES ):
1056             /* now create a bitmapinfoheader_t for decoder and
1057                add information found in p_esds */
1058             p_init = malloc( sizeof( BITMAPINFOHEADER ) + i_decoder_specific_info_len );
1059             p_bih = (BITMAPINFOHEADER*)p_init;
1060
1061             p_bih->biSize     = sizeof( BITMAPINFOHEADER ) + i_decoder_specific_info_len;
1062             p_bih->biWidth    = p_sample->data.p_sample_vide->i_width;
1063             p_bih->biHeight   = p_sample->data.p_sample_vide->i_height;
1064             p_bih->biPlanes   = 1;      // FIXME
1065             p_bih->biBitCount = 0;      // FIXME
1066             p_bih->biCompression   = 0; // FIXME
1067             p_bih->biSizeImage     = 0; // FIXME
1068             p_bih->biXPelsPerMeter = 0; // FIXME
1069             p_bih->biYPelsPerMeter = 0; // FIXME
1070             p_bih->biClrUsed       = 0; // FIXME
1071             p_bih->biClrImportant  = 0; // FIXME
1072
1073             if( p_bih->biWidth == 0 )
1074             {
1075                 // fall on display size
1076                 p_bih->biWidth = p_demux_track->i_width;
1077             }
1078             if( p_bih->biHeight == 0 )
1079             {
1080                 // fall on display size
1081                 p_bih->biHeight = p_demux_track->i_height;
1082             }
1083
1084             if( i_decoder_specific_info_len )
1085             {
1086                 memcpy( p_init + sizeof( BITMAPINFOHEADER ),
1087                         p_decoder_specific_info,
1088                         i_decoder_specific_info_len);
1089             }
1090             break;
1091
1092         case( AUDIO_ES ):
1093             p_init = malloc( sizeof( WAVEFORMATEX ) + i_decoder_specific_info_len);
1094             p_wf = (WAVEFORMATEX*)p_init;
1095
1096             p_wf->wFormatTag = 0;
1097             p_wf->nChannels = p_sample->data.p_sample_soun->i_channelcount;
1098             p_wf->nSamplesPerSec = p_sample->data.p_sample_soun->i_sampleratehi;
1099             p_wf->nAvgBytesPerSec = p_sample->data.p_sample_soun->i_channelcount *
1100                                     p_sample->data.p_sample_soun->i_sampleratehi *
1101                                     p_sample->data.p_sample_soun->i_samplesize / 8;
1102             p_wf->nBlockAlign = 0;
1103             p_wf->wBitsPerSample = p_sample->data.p_sample_soun->i_samplesize;
1104             p_wf->cbSize = i_decoder_specific_info_len;
1105
1106             if( i_decoder_specific_info_len )
1107             {
1108                 memcpy( p_init + sizeof( WAVEFORMATEX ),
1109                         p_decoder_specific_info,
1110                         i_decoder_specific_info_len);
1111             }
1112             break;
1113
1114         default:
1115             p_init = NULL;
1116             break;
1117     }
1118
1119     p_demux_track->p_es->p_demux_data = (es_sys_t *)p_init;
1120     vlc_mutex_lock( &p_input->stream.stream_lock );
1121     input_SelectES( p_input, p_demux_track->p_es );
1122     vlc_mutex_unlock( &p_input->stream.stream_lock );
1123
1124     p_demux_track->b_ok = 1;
1125     p_demux_track->b_selected = 1;
1126 }
1127
1128 static void MP4_StopDecoder( input_thread_t *p_input,
1129                              track_data_mp4_t *p_demux_track )
1130 {
1131     msg_Dbg( p_input, "Stopping decoder (track[Id 0x%x])",
1132                       p_demux_track->i_track_ID );
1133
1134     input_UnselectES( p_input, p_demux_track->p_es );
1135     p_demux_track->p_es = NULL;
1136
1137     p_demux_track->b_selected = 0;
1138 }
1139
1140 static int  MP4_ReadSample( input_thread_t *p_input,
1141                             track_data_mp4_t *p_demux_track,
1142                             pes_packet_t **pp_pes )
1143 {
1144     int i_size;
1145     off_t i_pos;
1146
1147     data_packet_t *p_data;
1148
1149
1150     /* this track have already reach the end */
1151     if( p_demux_track->i_sample >= p_demux_track->i_sample_count )
1152     {
1153         *pp_pes = NULL;
1154         return( 0 );
1155     }
1156     /* caculate size and position for this sample */
1157     i_size = p_demux_track->i_sample_size ?
1158                     p_demux_track->i_sample_size :
1159                     p_demux_track->p_sample_size[p_demux_track->i_sample];
1160
1161     i_pos  = MP4_GetTrackPos( p_demux_track );
1162
1163     /* go,go go ! */
1164     if( ! MP4_SeekAbsolute( p_input, i_pos ) )
1165     {
1166         return( 0 );
1167     }
1168
1169     /* now create a pes */
1170     if( !(*pp_pes = input_NewPES( p_input->p_method_data ) ) )
1171     {
1172         return( 0 );
1173     }
1174     /* and a data packet for the data */
1175     if( !(p_data = input_NewPacket( p_input->p_method_data, i_size ) ) )
1176     {
1177         input_DeletePES( p_input->p_method_data, *pp_pes );
1178         *pp_pes = NULL;
1179         return( 0 );
1180     }
1181
1182     /* initialisation of all the field */
1183     (*pp_pes)->i_dts =
1184         (*pp_pes)->i_pts = MP4_GetTrackPTS( p_demux_track );
1185     (*pp_pes)->p_first = (*pp_pes)->p_last  = p_data;
1186     (*pp_pes)->i_nb_data = 1;
1187     (*pp_pes)->i_pes_size = i_size;
1188
1189     if( !i_size )
1190     {
1191         return( 1 );
1192     }
1193
1194 /*    msg_Dbg( p_input, "will read %d bytes", i_size ); */
1195     if( !MP4_ReadData( p_input, p_data->p_payload_start, i_size ) )
1196     {
1197         input_DeletePES( p_input->p_method_data, *pp_pes );
1198         input_DeletePacket( p_input->p_method_data, p_data );
1199         return( 0 );
1200     }
1201
1202         return( 1 );
1203 }
1204
1205
1206 static int  MP4_DecodeSample( input_thread_t *p_input,
1207                               track_data_mp4_t *p_demux_track,
1208                               pes_packet_t *p_pes )
1209 {
1210
1211     if( !p_pes )
1212     {
1213         return( 0 );
1214     }
1215
1216     /* don't forget to convert in mpeg clock */
1217     /* FIXME correct ffmpeg to use dts instead of pts that it incorrect
1218        and, set it here ( and correct avi demux ) */
1219     p_pes->i_dts =
1220         p_pes->i_pts = input_ClockGetTS( p_input,
1221                                          p_input->stream.p_selected_program,
1222                                          p_pes->i_pts * 9/100);
1223
1224
1225     input_DecodePES( p_demux_track->p_es->p_decoder_fifo, p_pes );
1226
1227     /* now update sample position */
1228     p_demux_track->i_sample++; /* easy ;) */
1229     if( p_demux_track->i_sample >= p_demux_track->i_sample_count )
1230     {
1231         /* we have reach end of the track so free decoder stuff */
1232         MP4_StopDecoder( p_input, p_demux_track );
1233         return( 1 );
1234     }
1235     /* Have we changed chunk ? */
1236     if( p_demux_track->i_sample >=
1237             p_demux_track->chunk[p_demux_track->i_chunk].i_sample_first +
1238                 p_demux_track->chunk[p_demux_track->i_chunk].i_sample_count )
1239     {
1240         /* we haven't reached the end of the track, so see if we
1241            have to change the decoder for the next frame because
1242            i_sample_description_index has changed */
1243
1244         p_demux_track->i_chunk++;
1245         if( p_demux_track->chunk[p_demux_track->i_chunk-1].i_sample_description_index
1246               != p_demux_track->chunk[p_demux_track->i_chunk].i_sample_description_index  )
1247         {
1248             /* FIXME */
1249             msg_Warn( p_input,
1250                       "SampleEntry has changed, starting a new decoder" );
1251             MP4_StopDecoder( p_input, p_demux_track );
1252             MP4_StartDecoder( p_input, p_demux_track );
1253         }
1254     }
1255
1256
1257     return( 1 );
1258 }
1259
1260
1261