mp4.c

/*****************************************************************************
 * mp4.c : MP4 file input module for vlc
 *****************************************************************************
 * Copyright (C) 2001 VideoLAN
 * $Id: mp4.c,v 1.29 2003/05/06 16:05:10 fenrir Exp $
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>                                      /* malloc(), free() */
#include <string.h>                                              /* strdup() */
#include <errno.h>
#include <sys/types.h>

#include <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc_playlist.h>
#include "codecs.h"
#include "libmp4.h"
#include "mp4.h"

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int    MP4Init    ( vlc_object_t * );
static void __MP4End     ( vlc_object_t * );
static int    MP4Demux   ( input_thread_t * );

static int    MP4DemuxRef( input_thread_t *p_input )
{
    return 0;
}

/* New input could have something like that... */
static int   MP4Seek     ( input_thread_t *, mtime_t );

#define MP4End(a) __MP4End(VLC_OBJECT(a))

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
vlc_module_begin();
    set_description( _("MP4 demuxer") );
    set_capability( "demux", 242 );
    set_callbacks( MP4Init, __MP4End );
vlc_module_end();

/*****************************************************************************
 * Declaration of local function
 *****************************************************************************/

static void MP4_TrackCreate ( input_thread_t *,
                              track_data_mp4_t *,
                              MP4_Box_t  * );
static void MP4_TrackDestroy( input_thread_t *,
                              track_data_mp4_t * );

static int  MP4_TrackSelect ( input_thread_t *,
                              track_data_mp4_t *,
                              mtime_t );
static void MP4_TrackUnselect(input_thread_t *,
                              track_data_mp4_t * );

static int  MP4_TrackSeek   ( input_thread_t *,
                              track_data_mp4_t *,
                              mtime_t );

static uint64_t MP4_GetTrackPos( track_data_mp4_t * );
static int  MP4_TrackSampleSize( track_data_mp4_t * );
static int  MP4_TrackNextSample( input_thread_t *,
                                 track_data_mp4_t * );

#define MP4_Set4BytesLE( p, dw ) \
    *((uint8_t*)p)   = ( (dw)&0xff ); \
    *((uint8_t*)p+1) = ( ((dw)>> 8)&0xff ); \
    *((uint8_t*)p+2) = ( ((dw)>>16)&0xff ); \
    *((uint8_t*)p+3) = ( ((dw)>>24)&0xff )

#define MP4_Set2BytesLE( p, dw ) \
    *((uint8_t*)p) = ( (dw)&0xff ); \
    *((uint8_t*)p+1) = ( ((dw)>> 8)&0xff )

#define FREE( p ) \
    if( p ) { free( p ); (p) = NULL;}

/*****************************************************************************
 * MP4Init: check file and initializes MP4 structures
 *****************************************************************************/
static int MP4Init( vlc_object_t * p_this )
{
    input_thread_t  *p_input = (input_thread_t *)p_this;
    uint8_t         *p_peek;

    demux_sys_t     *p_demux;

    MP4_Box_t       *p_ftyp;

    MP4_Box_t       *p_rmra;

    MP4_Box_t       *p_mvhd;
    MP4_Box_t       *p_trak;

    unsigned int    i;
    vlc_bool_t      b_audio;

    /* I need to seek */
    if( !p_input->stream.b_seekable )
    {
        msg_Warn( p_input, "MP4 plugin discarded (unseekable)" );
        return( VLC_EGENERIC );

    }
    /* Initialize access plug-in structures. */
    if( p_input->i_mtu == 0 )
    {
        /* Improve speed. */
        p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE ;
    }

    p_input->pf_demux = MP4Demux;

    /* a little test to see if it could be a mp4 */
    if( input_Peek( p_input, &p_peek, 8 ) < 8 )
    {
        msg_Warn( p_input, "MP4 plugin discarded (cannot peek)" );
        return( VLC_EGENERIC );
    }


    switch( VLC_FOURCC( p_peek[4], p_peek[5], p_peek[6], p_peek[7] ) )
    {
        case( FOURCC_ftyp ):
        case( FOURCC_moov ):
        case( FOURCC_moof ):
        case( FOURCC_mdat ):
        case( FOURCC_udta ):
        case( FOURCC_free ):
        case( FOURCC_skip ):
        case( FOURCC_wide ):
            break;
         default:
            msg_Warn( p_input, "MP4 plugin discarded (not a valid file)" );
            return( VLC_EGENERIC );
    }

    /* create our structure that will contains all data */
    if( !( p_input->p_demux_data =
                p_demux = malloc( sizeof( demux_sys_t ) ) ) )
    {
        msg_Err( p_input, "out of memory" );
        return( VLC_EGENERIC );
    }
    memset( p_demux, 0, sizeof( demux_sys_t ) );
    p_input->p_demux_data = p_demux;


    /* Now load all boxes ( except raw data ) */
    if( !MP4_BoxGetRoot( p_input, &p_demux->box_root ) )
    {
        msg_Warn( p_input, "MP4 plugin discarded (not a valid file)" );
        return( VLC_EGENERIC );
    }

    MP4_BoxDumpStructure( p_input, &p_demux->box_root );

    if( ( p_ftyp = MP4_BoxGet( &p_demux->box_root, "/ftyp" ) ) )
    {
        switch( p_ftyp->data.p_ftyp->i_major_brand )
        {
            case( FOURCC_isom ):
                msg_Dbg( p_input,
                         "ISO Media file (isom) version %d.",
                         p_ftyp->data.p_ftyp->i_minor_version );
                break;
            default:
                msg_Dbg( p_input,
                         "unrecognized major file specification (%4.4s).",
                          (char*)&p_ftyp->data.p_ftyp->i_major_brand );
                break;
        }
    }
    else
    {
        msg_Dbg( p_input, "file type box missing (assuming ISO Media file)" );
    }

    /* the file need to have one moov box */
    if( MP4_BoxCount( &p_demux->box_root, "/moov" ) != 1 )
    {
        msg_Err( p_input,
                 "MP4 plugin discarded (%d moov boxes)",
                 MP4_BoxCount( &p_demux->box_root, "/moov" ) );
//        MP4End( p_input );
//        return( -1 );
    }

    if( ( p_rmra = MP4_BoxGet( &p_demux->box_root,  "/moov/rmra" ) ) )
    {
        playlist_t *p_playlist;
        int        i_count = MP4_BoxCount( p_rmra, "rmda" );
        int        i;

        msg_Dbg( p_input, "detected playlist mov file (%d ref)", i_count );

        p_playlist =
            (playlist_t *)vlc_object_find( p_input,
                                           VLC_OBJECT_PLAYLIST,
                                           FIND_ANYWHERE );
        if( p_playlist )
        {
            //p_playlist->pp_items[p_playlist->i_index]->b_autodeletion = VLC_TRUE;
            for( i = 0; i < i_count; i++ )
            {
                MP4_Box_t *p_rdrf = MP4_BoxGet( p_rmra, "rmda[%d]/rdrf", i );
                char      *psz_ref;
                uint32_t  i_ref_type;

                if( !p_rdrf || !( psz_ref = p_rdrf->data.p_rdrf->psz_ref ) )
                {
                    continue;
                }
                i_ref_type = p_rdrf->data.p_rdrf->i_ref_type;

                msg_Dbg( p_input, "new ref=`%s' type=%4.4s",
                         psz_ref, (char*)&i_ref_type );

                if( i_ref_type == VLC_FOURCC( 'u', 'r', 'l', ' ' ) )
                {
                    if( strstr( psz_ref, "qt5gateQT" ) )
                    {
                        msg_Dbg( p_input, "ignoring pseudo ref =`%s'", psz_ref );
                        continue;
                    }
                    if( !strncmp( psz_ref, "http://", 7 ) ||
                        !strncmp( psz_ref, "rtsp://", 7 ) )
                    {
                        msg_Dbg( p_input, "adding ref = `%s'", psz_ref );
                        playlist_Add( p_playlist, psz_ref, PLAYLIST_APPEND, PLAYLIST_END );
                    }
                    else
                    {
                        /* msg dbg relative ? */
                        char *psz_absolute = alloca( strlen( p_input->psz_source ) + strlen( psz_ref ) + 1);
                        char *end = strrchr( p_input->psz_source, '/' );

                        if( end )
                        {
                            int i_len = end + 1 - p_input->psz_source;

                            strncpy( psz_absolute, p_input->psz_source, i_len);
                            psz_absolute[i_len] = '\0';
                        }
                        else
                        {
                            strcpy( psz_absolute, "" );
                        }
                        strcat( psz_absolute, psz_ref );
                        msg_Dbg( p_input, "adding ref = `%s'", psz_absolute );
                        playlist_Add( p_playlist, psz_absolute, PLAYLIST_APPEND, PLAYLIST_END );
                    }
                }
                else
                {
                    msg_Err( p_input, "unknown ref type=%4.4s FIXME (send a bug report)", (char*)&p_rdrf->data.p_rdrf->i_ref_type );
                }
            }
            vlc_object_release( p_playlist );
        }
        else
        {
            msg_Err( p_input, "can't find playlist" );
        }
    }

    if( !(p_mvhd = MP4_BoxGet( &p_demux->box_root, "/moov/mvhd" ) ) )
    {
        if( !p_rmra )
        {
            msg_Err( p_input, "cannot find /moov/mvhd" );
            MP4End( p_input );
            return VLC_EGENERIC;
        }
        else
        {
            msg_Warn( p_input, "cannot find /moov/mvhd (pure ref file)" );
            p_input->pf_demux = MP4DemuxRef;
            return VLC_SUCCESS;
        }
    }
    else
    {
        p_demux->i_timescale = p_mvhd->data.p_mvhd->i_timescale;
        p_demux->i_duration = p_mvhd->data.p_mvhd->i_duration;
    }

    if( !( p_demux->i_tracks =
                MP4_BoxCount( &p_demux->box_root, "/moov/trak" ) ) )
    {
        msg_Err( p_input, "cannot find any /moov/trak" );
        MP4End( p_input );
        return( VLC_EGENERIC );
    }
    msg_Dbg( p_input, "find %d track%c",
                        p_demux->i_tracks,
                        p_demux->i_tracks ? 's':' ' );

    /*  create one program */
    vlc_mutex_lock( &p_input->stream.stream_lock );
    if( input_InitStream( p_input, 0 ) == -1)
    {
        vlc_mutex_unlock( &p_input->stream.stream_lock );
        msg_Err( p_input, "cannot init stream" );
        MP4End( p_input );
        return( VLC_EGENERIC );
    }
    /* Needed to create program _before_ MP4_TrackCreate */
    if( input_AddProgram( p_input, 0, 0) == NULL )
    {
        vlc_mutex_unlock( &p_input->stream.stream_lock );
        msg_Err( p_input, "cannot add program" );
        MP4End( p_input );
        return( VLC_EGENERIC );
    }
    p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
    /* XXX beurk and beurk, see MP4Demux and MP4Seek */
    if( p_demux->i_duration/p_demux->i_timescale > 0 )
    {
        p_input->stream.i_mux_rate =
            p_input->stream.p_selected_area->i_size / 50 /
            ( p_demux->i_duration / p_demux->i_timescale );
    }
    else
    {
        p_input->stream.i_mux_rate = 0;
    }
    vlc_mutex_unlock( &p_input->stream.stream_lock );


    /* allocate memory */
    p_demux->track = calloc( p_demux->i_tracks, sizeof( track_data_mp4_t ) );

    /* now process each track and extract all usefull informations */
    for( i = 0; i < p_demux->i_tracks; i++ )
    {
        p_trak = MP4_BoxGet( &p_demux->box_root, "/moov/trak[%d]", i );
        MP4_TrackCreate( p_input, &p_demux->track[i], p_trak );

        if( p_demux->track[i].b_ok )
        {
            char *psz_cat;
            switch( p_demux->track[i].i_cat )
            {
                case( VIDEO_ES ):
                    psz_cat = "video";
                    break;
                case( AUDIO_ES ):
                    psz_cat = "audio";
                    break;
                default:
                    psz_cat = "unknown";
                    break;
            }

            msg_Dbg( p_input, "adding track[Id 0x%x] %s (%s) language %c%c%c",
                            p_demux->track[i].i_track_ID,
                            psz_cat,
                            p_demux->track[i].b_enable ? "enable":"disable",
                            p_demux->track[i].i_language[0],
                            p_demux->track[i].i_language[1],
                            p_demux->track[i].i_language[2] );
        }
        else
        {
            msg_Dbg( p_input, "ignoring track[Id 0x%x]", p_demux->track[i].i_track_ID );
        }

    }

    for( i = 0, b_audio = VLC_FALSE; i < p_demux->i_tracks; i++ )
    {
#define track p_demux->track[i]
        /* start decoder for this track if enable by default*/
        if( track.b_ok && track.b_enable &&
            ( track.i_cat != AUDIO_ES || !b_audio ) )
        {
            if( !MP4_TrackSelect( p_input, &track, 0 ) )
            {
                if(track.i_cat == AUDIO_ES )
                {
                    b_audio = VLC_TRUE;
                }
            }
        }
#undef track
    }

    vlc_mutex_lock( &p_input->stream.stream_lock );
    p_input->stream.p_selected_program->b_is_ok = 1;
    vlc_mutex_unlock( &p_input->stream.stream_lock );

    return( VLC_SUCCESS );
}

/*****************************************************************************
 * MP4Demux: read packet and send them to decoders
 *****************************************************************************
 * TODO check for newly selected track (ie audio upt to now )
 *****************************************************************************/
static int MP4Demux( input_thread_t *p_input )
{
    demux_sys_t *p_demux = p_input->p_demux_data;
    unsigned int i_track;


    unsigned int i_track_selected;
    vlc_bool_t   b_video;
    vlc_bool_t   b_play_audio;

    /* check for newly selected/unselected track */
    for( i_track = 0, i_track_selected = 0, b_video = VLC_FALSE;
            i_track <  p_demux->i_tracks; i_track++ )
    {
#define track   p_demux->track[i_track]
        if( track.b_selected && track.i_sample >= track.i_sample_count )
        {
            msg_Warn( p_input, "track[0x%x] will be disabled", track.i_track_ID );
            MP4_TrackUnselect( p_input, &track );
        }
        else if( track.b_ok )
        {
            if( track.b_selected && track.p_es->p_decoder_fifo == NULL )
            {
                MP4_TrackUnselect( p_input, &track );
            }
            else if( !track.b_selected && track.p_es->p_decoder_fifo != NULL )
            {
                MP4_TrackSelect( p_input, &track, MP4_GetMoviePTS( p_demux ) );
            }

            if( track.b_selected )
            {
                i_track_selected++;

                if( track.i_cat == VIDEO_ES )
                {
                    b_video = VLC_TRUE;
                }
            }
        }
#undef  track
    }

    if( i_track_selected <= 0 )
    {
        msg_Warn( p_input, "no track selected, exiting..." );
        return( 0 );
    }


    /* XXX beurk, beuRK and BEURK,
       but only way I've found to detect seek from interface */
    if( p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT )
    {
        mtime_t i_date;

        /* first wait for empty buffer, arbitrary time FIXME */
        msleep( DEFAULT_PTS_DELAY );
        /* *** calculate new date *** */

        i_date = (mtime_t)1000000 *
                 (mtime_t)p_demux->i_duration /
                 (mtime_t)p_demux->i_timescale *
                 (mtime_t)MP4_TellAbsolute( p_input ) /
                 (mtime_t)p_input->stream.p_selected_area->i_size;
        MP4Seek( p_input, i_date );
    }

    /* first wait for the good time to read a packet */
    input_ClockManageRef( p_input,
                          p_input->stream.p_selected_program,
                          p_demux->i_pcr );


    /* update pcr XXX in mpeg scale so in 90000 unit/s */
    p_demux->i_pcr = MP4_GetMoviePTS( p_demux ) * 9 / 100;


    /* we will read 100ms for each stream so ...*/
    p_demux->i_time += __MAX( p_demux->i_timescale / 10 , 1 );


    /* *** send audio data to decoder if rate == DEFAULT_RATE or no video *** */
    vlc_mutex_lock( &p_input->stream.stream_lock );
    if( p_input->stream.control.i_rate == DEFAULT_RATE || !b_video )
    {
        b_play_audio = VLC_TRUE;
    }
    else
    {
        b_play_audio = VLC_FALSE;
    }
    vlc_mutex_unlock( &p_input->stream.stream_lock );

    for( i_track = 0; i_track < p_demux->i_tracks; i_track++ )
    {
#define track p_demux->track[i_track]
        if( !track.b_ok ||
            !track.b_selected ||
            MP4_GetTrackPTS( &track ) >= MP4_GetMoviePTS( p_demux ) )
        {
            continue;
        }
        while( MP4_GetTrackPTS( &track ) < MP4_GetMoviePTS( p_demux ) )
        {

            if( !b_play_audio && track.i_cat == AUDIO_ES )
            {
                if( MP4_TrackNextSample( p_input, &track ) )
                {
                    break;
                }
            }
            else
            {
                size_t i_size;
                off_t i_pos;

                data_packet_t *p_data;
                pes_packet_t *p_pes;

                /* caculate size and position for this sample */
                i_size = MP4_TrackSampleSize( &track );

                i_pos  = MP4_GetTrackPos( &track );

                //msg_Dbg( p_input, "stream %d size=%6d pos=%8lld",  i_track, i_size, i_pos );

                /* go,go go ! */
                if( MP4_SeekAbsolute( p_input, i_pos ) )
                {
                    msg_Warn( p_input, "track[0x%x] will be disabled (eof?)", track.i_track_ID );
                    MP4_TrackUnselect( p_input, &track );
                    break;
                }


                /* now create a pes */
                if( !(p_pes = input_NewPES( p_input->p_method_data ) ) )
                {
                    break;
                }
                /* and a data packet for the data */
                if( !(p_data = input_NewPacket( p_input->p_method_data, i_size ) ) )
                {
                    input_DeletePES( p_input->p_method_data, p_pes );
                    break;
                }
                p_data->p_payload_end = p_data->p_payload_start + i_size;

                /* initialisation of all the field */
                p_pes->i_dts = p_pes->i_pts = 0;
                p_pes->p_first = p_pes->p_last  = p_data;
                p_pes->i_nb_data = 1;
                p_pes->i_pes_size = i_size;
                if( i_size > 0 )
                {
                    if( MP4_ReadData( p_input, p_data->p_payload_start, i_size ) )
                    {
                        input_DeletePES( p_input->p_method_data, p_pes );

                        msg_Warn( p_input, "track[0x%x] will be disabled (eof?)", track.i_track_ID );
                        MP4_TrackUnselect( p_input, &track );
                        break;
                    }
                }

                p_pes->i_dts =
                    p_pes->i_pts = input_ClockGetTS( p_input,
                                                     p_input->stream.p_selected_program,
                                                     MP4_GetTrackPTS( &track ) * 9/100);

                if( track.p_es->p_decoder_fifo )
                {
                    input_DecodePES( track.p_es->p_decoder_fifo, p_pes );
                }
                else
                {
                    input_DeletePES( p_input->p_method_data, p_pes );
                }

                if( MP4_TrackNextSample( p_input, &track ) )
                {
                    break;
                }
            }
        }
#undef track
    }

    return( 1 );
}
/*****************************************************************************
 * MP4Seek: Got to i_date
 ******************************************************************************/
static int   MP4Seek     ( input_thread_t *p_input, mtime_t i_date )
{
    demux_sys_t *p_demux = p_input->p_demux_data;
    unsigned int i_track;
    /* First update update global time */
    p_demux->i_time = i_date * p_demux->i_timescale / 1000000;
    p_demux->i_pcr  = i_date* 9 / 100;

    /* Now for each stream try to go to this time */
    for( i_track = 0; i_track < p_demux->i_tracks; i_track++ )
    {
#define track p_demux->track[i_track]
        if( track.b_ok && track.b_selected )
        {
            MP4_TrackSeek( p_input, &track, i_date );
        }
#undef  track
    }
    return( 1 );
}

/*****************************************************************************
 * MP4End: frees unused data
 *****************************************************************************/
static void __MP4End ( vlc_object_t * p_this )
{
    unsigned int i_track;
    input_thread_t *  p_input = (input_thread_t *)p_this;
    demux_sys_t *p_demux = p_input->p_demux_data;

    msg_Dbg( p_input, "freeing all memory" );
    MP4_BoxFree( p_input, &p_demux->box_root );
    for( i_track = 0; i_track < p_demux->i_tracks; i_track++ )
    {
        MP4_TrackDestroy( p_input, &p_demux->track[i_track] );
    }
    FREE( p_demux->track );

    FREE( p_input->p_demux_data );
}


/****************************************************************************
 * Local functions, specific to vlc
 ****************************************************************************/

/* now create basic chunk data, the rest will be filled by MP4_CreateSamplesIndex */
static int TrackCreateChunksIndex( input_thread_t *p_input,
                                   track_data_mp4_t *p_demux_track )
{
    MP4_Box_t *p_co64; /* give offset for each chunk, same for stco and co64 */
    MP4_Box_t *p_stsc;

    unsigned int i_chunk;
    unsigned int i_index, i_last;

    if( ( !(p_co64 = MP4_BoxGet( p_demux_track->p_stbl, "stco" ) )&&
          !(p_co64 = MP4_BoxGet( p_demux_track->p_stbl, "co64" ) ) )||
        ( !(p_stsc = MP4_BoxGet( p_demux_track->p_stbl, "stsc" ) ) ))
    {
        return( VLC_EGENERIC );
    }

    p_demux_track->i_chunk_count = p_co64->data.p_co64->i_entry_count;
    if( !p_demux_track->i_chunk_count )
    {
        msg_Warn( p_input, "no chunk defined" );
        return( VLC_EGENERIC );
    }
    p_demux_track->chunk = calloc( p_demux_track->i_chunk_count,
                                   sizeof( chunk_data_mp4_t ) );

    /* first we read chunk offset */
    for( i_chunk = 0; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
    {
        p_demux_track->chunk[i_chunk].i_offset =
                p_co64->data.p_co64->i_chunk_offset[i_chunk];
    }

    /* now we read index for SampleEntry( soun vide mp4a mp4v ...)
        to be used for the sample XXX begin to 1
        We construct it begining at the end */
    i_last = p_demux_track->i_chunk_count; /* last chunk proceded */
    i_index = p_stsc->data.p_stsc->i_entry_count;
    if( !i_index )
    {
        msg_Warn( p_input, "cannot read chunk table or table empty" );
        return( VLC_EGENERIC );
    }

    while( i_index )
    {
        i_index--;
        for( i_chunk = p_stsc->data.p_stsc->i_first_chunk[i_index] - 1;
                i_chunk < i_last; i_chunk++ )
        {
            p_demux_track->chunk[i_chunk].i_sample_description_index =
                    p_stsc->data.p_stsc->i_sample_description_index[i_index];
            p_demux_track->chunk[i_chunk].i_sample_count =
                    p_stsc->data.p_stsc->i_samples_per_chunk[i_index];
        }
        i_last = p_stsc->data.p_stsc->i_first_chunk[i_index] - 1;
    }

    p_demux_track->chunk[0].i_sample_first = 0;
    for( i_chunk = 1; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
    {
        p_demux_track->chunk[i_chunk].i_sample_first =
            p_demux_track->chunk[i_chunk-1].i_sample_first +
                p_demux_track->chunk[i_chunk-1].i_sample_count;
    }

    msg_Dbg( p_input,
             "track[Id 0x%x] read %d chunk",
             p_demux_track->i_track_ID,
            p_demux_track->i_chunk_count );

    return( VLC_SUCCESS );
}
static int TrackCreateSamplesIndex( input_thread_t *p_input,
                                    track_data_mp4_t *p_demux_track )
{
    MP4_Box_t *p_stts; /* makes mapping between sample and decoding time,
                          ctts make same mapping but for composition time,
                          not yet used and probably not usefull */
    MP4_Box_t *p_stsz; /* gives sample size of each samples, there is also stz2
                          that uses a compressed form FIXME make them in libmp4
                          as a unique type */
    /* TODO use also stss and stsh table for seeking */
    /* FIXME use edit table */
    int64_t i_sample;
    int64_t i_chunk;

    int64_t i_index;
    int64_t i_index_sample_used;

    int64_t i_last_dts;

    p_stts = MP4_BoxGet( p_demux_track->p_stbl, "stts" );
    p_stsz = MP4_BoxGet( p_demux_track->p_stbl, "stsz" ); /* FIXME and stz2 */

    if( ( !p_stts )||( !p_stsz ) )
    {
        msg_Warn( p_input, "cannot read sample table" );
        return( VLC_EGENERIC );
    }

    p_demux_track->i_sample_count = p_stsz->data.p_stsz->i_sample_count;


    /* for sample size, there are 2 case */
    if( p_stsz->data.p_stsz->i_sample_size )
    {
        /* 1: all sample have the same size, so no need to construct a table */
        p_demux_track->i_sample_size = p_stsz->data.p_stsz->i_sample_size;
        p_demux_track->p_sample_size = NULL;
    }
    else
    {
        /* 2: each sample can have a different size */
        p_demux_track->i_sample_size = 0;
        p_demux_track->p_sample_size =
            calloc( p_demux_track->i_sample_count, sizeof( uint32_t ) );

        for( i_sample = 0; i_sample < p_demux_track->i_sample_count; i_sample++ )
        {
            p_demux_track->p_sample_size[i_sample] =
                    p_stsz->data.p_stsz->i_entry_size[i_sample];
        }
    }
    /* we have extract all information from stsz,
        now use stts */

    /* if we don't want to waste too much memory, we can't expand
       the box !, so each chunk will contain an "extract" of this table
       for fast research */

    i_last_dts = 0;
    i_index = 0; i_index_sample_used =0;

    /* create and init last data for each chunk */
    for(i_chunk = 0 ; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
    {

        int64_t i_entry, i_sample_count, i;
        /* save last dts */
        p_demux_track->chunk[i_chunk].i_first_dts = i_last_dts;
    /* count how many entries needed for this chunk
       for p_sample_delta_dts and p_sample_count_dts */

        i_sample_count = p_demux_track->chunk[i_chunk].i_sample_count;

        i_entry = 0;
        while( i_sample_count > 0 )
        {
            i_sample_count -= p_stts->data.p_stts->i_sample_count[i_index+i_entry];
            if( i_entry == 0 )
            {
                i_sample_count += i_index_sample_used; /* don't count already used sample
                                                   int this entry */
            }
            i_entry++;
        }

        /* allocate them */
        p_demux_track->chunk[i_chunk].p_sample_count_dts =
            calloc( i_entry, sizeof( uint32_t ) );
        p_demux_track->chunk[i_chunk].p_sample_delta_dts =
            calloc( i_entry, sizeof( uint32_t ) );

        /* now copy */
        i_sample_count = p_demux_track->chunk[i_chunk].i_sample_count;
        for( i = 0; i < i_entry; i++ )
        {
            int64_t i_used;
            int64_t i_rest;

            i_rest = p_stts->data.p_stts->i_sample_count[i_index] - i_index_sample_used;

            i_used = __MIN( i_rest, i_sample_count );

            i_index_sample_used += i_used;
            i_sample_count -= i_used;

            p_demux_track->chunk[i_chunk].p_sample_count_dts[i] = i_used;

            p_demux_track->chunk[i_chunk].p_sample_delta_dts[i] =
                        p_stts->data.p_stts->i_sample_delta[i_index];

            i_last_dts += i_used *
                    p_demux_track->chunk[i_chunk].p_sample_delta_dts[i];

            if( i_index_sample_used >=
                             p_stts->data.p_stts->i_sample_count[i_index] )
            {

                i_index++;
                i_index_sample_used = 0;
            }
        }

    }

    msg_Dbg( p_input,
             "track[Id 0x%x] read %d samples length:"I64Fd"s",
             p_demux_track->i_track_ID,
             p_demux_track->i_sample_count,
             i_last_dts / p_demux_track->i_timescale );

    return( VLC_SUCCESS );
}

/*
 * TrackCreateES:
 *  Create ES and PES to init decoder if needed, for a track starting at i_chunk
 */
static int  TrackCreateES   ( input_thread_t   *p_input,
                              track_data_mp4_t *p_track,
                              unsigned int     i_chunk,
                              es_descriptor_t  **pp_es,
                              pes_packet_t     **pp_pes )
{
    MP4_Box_t *  p_sample;
    unsigned int i;
    char psz_lang[4];

    unsigned int i_decoder_specific_info_len;
    uint8_t *    p_decoder_specific_info;

    es_descriptor_t *p_es;
    pes_packet_t    *p_pes_init;

    uint8_t             *p_init;
    BITMAPINFOHEADER    *p_bih;
    WAVEFORMATEX        *p_wf;

    MP4_Box_t   *p_esds;

    if( !p_track->chunk[i_chunk].i_sample_description_index )
    {
        msg_Warn( p_input,
                  "invalid SampleEntry index (track[Id 0x%x])",
                  p_track->i_track_ID );
        return( VLC_EGENERIC );
    }

    p_sample = MP4_BoxGet(  p_track->p_stsd,
                            "[%d]",
                p_track->chunk[i_chunk].i_sample_description_index - 1 );

    if( !p_sample || !p_sample->data.p_data )
    {
        msg_Warn( p_input,
                  "cannot find SampleEntry (track[Id 0x%x])",
                  p_track->i_track_ID );
        return( VLC_EGENERIC );
    }

    p_track->p_sample = p_sample;

    if( p_track->i_sample_size == 1 )
    {
        MP4_Box_data_sample_soun_t *p_soun;

        p_soun = p_sample->data.p_sample_soun;

        if( p_soun->i_qt_version == 0 )
        {
            switch( p_sample->i_type )
            {
                case VLC_FOURCC( 'i', 'm', 'a', '4' ):
                    p_soun->i_qt_version = 1;
                    p_soun->i_sample_per_packet = 64;
                    p_soun->i_bytes_per_packet  = 34;
                    p_soun->i_bytes_per_frame   = 34 * p_soun->i_channelcount;
                    p_soun->i_bytes_per_sample  = 2;
                    break;
                default:
                    break;
            }
        }
    }

    /* Initialise ES, first language as description */
    for( i = 0; i < 3; i++ )
    {
        psz_lang[i] = p_track->i_language[i];
    }
    psz_lang[3] = '\0';

    vlc_mutex_lock( &p_input->stream.stream_lock );
    p_es = input_AddES( p_input, p_input->stream.p_selected_program,
                        p_track->i_track_ID, p_track->i_cat, psz_lang, 0 );
    vlc_mutex_unlock( &p_input->stream.stream_lock );

    p_es->i_stream_id = p_track->i_track_ID;

    /* It's a little ugly but .. there are special cases */
    switch( p_sample->i_type )
    {
        case( VLC_FOURCC( '.', 'm', 'p', '3' ) ):
        case( VLC_FOURCC( 'm', 's', 0x00, 0x55 ) ):
            p_es->i_fourcc = VLC_FOURCC( 'm', 'p', 'g', 'a' );
            break;
        case( VLC_FOURCC( 'r', 'a', 'w', ' ' ) ):
            p_es->i_fourcc = VLC_FOURCC( 'a', 'r', 'a', 'w' );
            break;
        case( VLC_FOURCC( 's', '2', '6', '3' ) ):
            p_es->i_fourcc = VLC_FOURCC( 'h', '2', '6', '3' );
            break;
        default:
            p_es->i_fourcc = p_sample->i_type;
            break;
    }

    i_decoder_specific_info_len = 0;
    p_decoder_specific_info = NULL;
    p_pes_init = NULL;

    /* now see if esds is present and if so create a data packet
        with decoder_specific_info  */
#define p_decconfig p_esds->data.p_esds->es_descriptor.p_decConfigDescr
    if( ( p_esds = MP4_BoxGet( p_sample, "esds" ) )&&