mp4.c 69.7 KB
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/*****************************************************************************
 * mp4.c : MP4 file input module for vlc
 *****************************************************************************
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 * Copyright (C) 2001-2004 VideoLAN
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 * $Id$
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 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
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 *
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 * 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.
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 *
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 * 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 <vlc/vlc.h>
#include <vlc/input.h>
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#include <vlc_playlist.h>
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#include "iso_lang.h"
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#include "vlc_meta.h"
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#include "libmp4.h"
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#include "drms.h"
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#ifdef UNDER_CE
#define uint64_t int64_t
#endif

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/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
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static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );
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vlc_module_begin();
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    set_description( _("MP4 stream demuxer") );
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    set_capability( "demux2", 242 );
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    set_callbacks( Open, Close );
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vlc_module_end();

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/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
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static int    Demux   ( demux_t * );
static int    DemuxRef( demux_t *p_demux )
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{
    return 0;
}
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static int   Seek     ( demux_t *, mtime_t );
static int   Control  ( demux_t *, int, va_list );
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/* Contain all information about a chunk */
typedef struct
{
    uint64_t     i_offset; /* absolute position of this chunk in the file */
    uint32_t     i_sample_description_index; /* index for SampleEntry to use */
    uint32_t     i_sample_count; /* how many samples in this chunk */
    uint32_t     i_sample_first; /* index of the first sample in this chunk */

    /* now provide way to calculate pts, dts, and offset without to
        much memory and with fast acces */

    /* with this we can calculate dts/pts without waste memory */
    uint64_t     i_first_dts;
    uint32_t     *p_sample_count_dts;
    uint32_t     *p_sample_delta_dts; /* dts delta */

    /* TODO if needed add pts
        but quickly *add* support for edts and seeking */

} mp4_chunk_t;


 /* Contain all needed information for read all track with vlc */
typedef struct
{
    int i_track_ID;     /* this should be unique */

    int b_ok;           /* The track is usable */
    int b_enable;       /* is the trak enable by default */
    vlc_bool_t b_selected;     /* is the trak being played */

    es_format_t fmt;
    es_out_id_t *p_es;

    /* display size only ! */
    int i_width;
    int i_height;

    /* more internal data */
    uint64_t        i_timescale;    /* time scale for this track only */

    /* elst */
    int             i_elst;         /* current elst */
    int64_t         i_elst_time;    /* current elst start time (in movie time scale)*/
    MP4_Box_t       *p_elst;        /* elst (could be NULL) */

    /* give the next sample to read, i_chunk is to find quickly where
      the sample is located */
    uint32_t         i_sample;       /* next sample to read */
    uint32_t         i_chunk;        /* chunk where next sample is stored */
    /* total count of chunk and sample */
    uint32_t         i_chunk_count;
    uint32_t         i_sample_count;

    mp4_chunk_t    *chunk; /* always defined  for each chunk */

    /* sample size, p_sample_size defined only if i_sample_size == 0
        else i_sample_size is size for all sample */
    uint32_t         i_sample_size;
    uint32_t         *p_sample_size; /* XXX perhaps add file offset if take
                                    too much time to do sumations each time*/

    MP4_Box_t *p_stbl;  /* will contain all timing information */
    MP4_Box_t *p_stsd;  /* will contain all data to initialize decoder */
    MP4_Box_t *p_sample;/* point on actual sdsd */

    vlc_bool_t b_drms;
    void      *p_drms;

} mp4_track_t;


struct demux_sys_t
{
    MP4_Box_t    *p_root;      /* container for the whole file */

    mtime_t      i_pcr;

    uint64_t     i_time;        /* time position of the presentation
                                 * in movie timescale */
    uint64_t     i_timescale;   /* movie time scale */
    uint64_t     i_duration;    /* movie duration */
    unsigned int i_tracks;      /* number of tracks */
    mp4_track_t *track;    /* array of track */
};


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/*****************************************************************************
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 * Declaration of local function
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 *****************************************************************************/
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static void MP4_TrackCreate ( demux_t *, mp4_track_t *, MP4_Box_t  *);
static void MP4_TrackDestroy( demux_t *, mp4_track_t * );
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static int  MP4_TrackSelect ( demux_t *, mp4_track_t *, mtime_t );
static void MP4_TrackUnselect(demux_t *, mp4_track_t * );
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static int  MP4_TrackSeek   ( demux_t *, mp4_track_t *, mtime_t );
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static uint64_t MP4_TrackGetPos    ( mp4_track_t * );
static int      MP4_TrackSampleSize( mp4_track_t * );
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static int      MP4_TrackNextSample( demux_t *, mp4_track_t * );
static void     MP4_TrackSetELST( demux_t *, mp4_track_t *, int64_t );
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/* Return time in s of a track */
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static inline int64_t MP4_TrackGetPTS( demux_t *p_demux, mp4_track_t *p_track )
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{
    unsigned int i_sample;
    unsigned int i_index;
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    int64_t i_dts;
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    i_sample = p_track->i_sample - p_track->chunk[p_track->i_chunk].i_sample_first;
    i_dts = p_track->chunk[p_track->i_chunk].i_first_dts;
    i_index = 0;
    while( i_sample > 0 )
    {
        if( i_sample > p_track->chunk[p_track->i_chunk].p_sample_count_dts[i_index] )
        {
            i_dts += p_track->chunk[p_track->i_chunk].p_sample_count_dts[i_index] *
                        p_track->chunk[p_track->i_chunk].p_sample_delta_dts[i_index];
            i_sample -= p_track->chunk[p_track->i_chunk].p_sample_count_dts[i_index];
            i_index++;
        }
        else
        {
            i_dts += i_sample *
                        p_track->chunk[p_track->i_chunk].p_sample_delta_dts[i_index];
            i_sample = 0;
            break;
        }
    }

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    /* now handle elst */
    if( p_track->p_elst )
    {
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        demux_sys_t         *p_sys = p_demux->p_sys;
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        MP4_Box_data_elst_t *elst = p_track->p_elst->data.p_elst;

        /* convert to offset */
        if( ( elst->i_media_rate_integer[p_track->i_elst] > 0 ||
              elst->i_media_rate_fraction[p_track->i_elst] > 0 ) &&
            elst->i_media_time[p_track->i_elst] > 0 )
        {
            i_dts -= elst->i_media_time[p_track->i_elst];
        }

        /* add i_elst_time */
        i_dts += p_track->i_elst_time * p_track->i_timescale / p_sys->i_timescale;

        if( i_dts < 0 ) i_dts = 0;
    }

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    return (int64_t)1000000 * i_dts / p_track->i_timescale;
}
static inline int64_t MP4_GetMoviePTS(demux_sys_t *p_sys )
{
    return (int64_t)1000000 * p_sys->i_time / p_sys->i_timescale;
}
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#define FREE( p ) if( p ) { free( p ); (p) = NULL;}
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/*****************************************************************************
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 * Open: check file and initializes MP4 structures
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 *****************************************************************************/
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static int Open( vlc_object_t * p_this )
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{
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    demux_t  *p_demux = (demux_t *)p_this;
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    demux_sys_t     *p_sys;
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    uint8_t         *p_peek;
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    MP4_Box_t       *p_ftyp;
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    MP4_Box_t       *p_rmra;
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    MP4_Box_t       *p_mvhd;
    MP4_Box_t       *p_trak;
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    unsigned int    i;
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    vlc_bool_t      b_seekable;
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    /* a little test to see if it could be a mp4 */
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    if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
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    {
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        msg_Warn( p_demux, "MP4 plugin discarded (cannot peek)" );
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        return VLC_EGENERIC;
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    }
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    switch( VLC_FOURCC( p_peek[4], p_peek[5], p_peek[6], p_peek[7] ) )
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    {
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        case FOURCC_ftyp:
        case FOURCC_moov:
        case FOURCC_foov:
        case FOURCC_moof:
        case FOURCC_mdat:
        case FOURCC_udta:
        case FOURCC_free:
        case FOURCC_skip:
        case FOURCC_wide:
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        case VLC_FOURCC( 'p', 'n', 'o', 't' ):
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            break;
         default:
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            msg_Warn( p_demux, "MP4 plugin discarded (not a valid file)" );
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            return VLC_EGENERIC;
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    }
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    /* I need to seek */
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    stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_seekable );
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    if( !b_seekable )
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    {
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        msg_Warn( p_demux, "MP4 plugin discarded (unseekable)" );
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        return VLC_EGENERIC;
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    }
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    /*Set exported functions */
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    p_demux->pf_demux = Demux;
    p_demux->pf_control = Control;
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    /* create our structure that will contains all data */
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    p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
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    memset( p_sys, 0, sizeof( demux_sys_t ) );
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    /* Now load all boxes ( except raw data ) */
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    if( ( p_sys->p_root = MP4_BoxGetRoot( p_demux->s ) ) == NULL )
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    {
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        msg_Warn( p_demux, "MP4 plugin discarded (not a valid file)" );
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        goto error;
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    }

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    MP4_BoxDumpStructure( p_demux->s, p_sys->p_root );
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    if( ( p_ftyp = MP4_BoxGet( p_sys->p_root, "/ftyp" ) ) )
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    {
        switch( p_ftyp->data.p_ftyp->i_major_brand )
        {
            case( FOURCC_isom ):
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                msg_Dbg( p_demux,
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                         "ISO Media file (isom) version %d.",
                         p_ftyp->data.p_ftyp->i_minor_version );
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                break;
            default:
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                msg_Dbg( p_demux,
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                         "unrecognized major file specification (%4.4s).",
                          (char*)&p_ftyp->data.p_ftyp->i_major_brand );
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                break;
        }
    }
    else
    {
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        msg_Dbg( p_demux, "file type box missing (assuming ISO Media file)" );
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    }

    /* the file need to have one moov box */
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    if( MP4_BoxCount( p_sys->p_root, "/moov" ) <= 0 )
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    {
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        MP4_Box_t *p_foov = MP4_BoxGet( p_sys->p_root, "/foov" );
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        if( !p_foov )
        {
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            msg_Err( p_demux, "MP4 plugin discarded (no moov box)" );
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            goto error;
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        }
        /* we have a free box as a moov, rename it */
        p_foov->i_type = FOURCC_moov;
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    }

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    if( ( p_rmra = MP4_BoxGet( p_sys->p_root,  "/moov/rmra" ) ) )
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    {
        playlist_t *p_playlist;
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        playlist_item_t *p_item;
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        int        i_count = MP4_BoxCount( p_rmra, "rmda" );
        int        i;
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        vlc_bool_t b_play = VLC_FALSE;
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        msg_Dbg( p_demux, "detected playlist mov file (%d ref)", i_count );
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        p_playlist =
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            (playlist_t *)vlc_object_find( p_demux,
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                                           VLC_OBJECT_PLAYLIST,
                                           FIND_ANYWHERE );
        if( p_playlist )
        {
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            p_item = playlist_ItemGetByInput( p_playlist,
                      ((input_thread_t *)p_demux->p_parent)->input.p_item );
            playlist_ItemToNode( p_playlist, p_item );

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            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;

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

                if( i_ref_type == VLC_FOURCC( 'u', 'r', 'l', ' ' ) )
                {
                    if( strstr( psz_ref, "qt5gateQT" ) )
                    {
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                        msg_Dbg( p_demux, "ignoring pseudo ref =`%s'", psz_ref );
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                        continue;
                    }
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                    if( !strncmp( psz_ref, "http://", 7 ) ||
                        !strncmp( psz_ref, "rtsp://", 7 ) )
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                    {
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                        msg_Dbg( p_demux, "adding ref = `%s'", psz_ref );
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                        if( p_item )
                        {
                            playlist_item_t *p_child =
                                        playlist_ItemNew( p_playlist,
                                                          psz_ref, psz_ref );
                            if( p_child )
                            {
                                playlist_NodeAddItem( p_playlist, p_child,
                                                 p_item->pp_parents[0]->i_view,
                                                 p_item, PLAYLIST_APPEND,
                                                 PLAYLIST_END );
                                playlist_CopyParents( p_item, p_child );
                                b_play = VLC_TRUE;
                            }
                        }
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                    }
                    else
                    {
                        /* msg dbg relative ? */
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                        char *psz_absolute = alloca( strlen( p_demux->psz_access ) + 3 + strlen( p_demux->psz_path ) + strlen( psz_ref ) + 1);
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                        char *end = strrchr( p_demux->psz_path, '/' );
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                        if( end )
                        {
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                            int i_len = end + 1 - p_demux->psz_path;
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                            strcpy( psz_absolute, p_demux->psz_access );
                            strcat( psz_absolute, "://" );
                            strncat( psz_absolute, p_demux->psz_path, i_len);
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                        }
                        else
                        {
                            strcpy( psz_absolute, "" );
                        }
                        strcat( psz_absolute, psz_ref );
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                        msg_Dbg( p_demux, "adding ref = `%s'", psz_absolute );
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                        if( p_item )
                        {
                            playlist_item_t *p_child =
                                        playlist_ItemNew( p_playlist,
                                                          psz_absolute,
                                                          psz_absolute );
                            if( p_child )
                            {
                                playlist_NodeAddItem( p_playlist, p_child,
                                                 p_item->pp_parents[0]->i_view,
                                                 p_item, PLAYLIST_APPEND,
                                                 PLAYLIST_END );
                                playlist_CopyParents( p_item, p_child );
                                b_play = VLC_TRUE;
                            }
                        }
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                    }
                }
                else
                {
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                    msg_Err( p_demux, "unknown ref type=%4.4s FIXME (send a bug report)",
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                             (char*)&p_rdrf->data.p_rdrf->i_ref_type );
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                }
            }
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            if( b_play == VLC_TRUE )
            {
                 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY,
                                   p_playlist->status.i_view,
                                   p_playlist->status.p_item, NULL );
            }
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            vlc_object_release( p_playlist );
        }
        else
        {
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            msg_Err( p_demux, "can't find playlist" );
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        }
    }

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    if( !(p_mvhd = MP4_BoxGet( p_sys->p_root, "/moov/mvhd" ) ) )
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    {
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        if( !p_rmra )
        {
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            msg_Err( p_demux, "cannot find /moov/mvhd" );
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            goto error;
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        }
        else
        {
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            msg_Warn( p_demux, "cannot find /moov/mvhd (pure ref file)" );
            p_demux->pf_demux = DemuxRef;
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            return VLC_SUCCESS;
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        }
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    }
    else
    {
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        p_sys->i_timescale = p_mvhd->data.p_mvhd->i_timescale;
        p_sys->i_duration = p_mvhd->data.p_mvhd->i_duration;
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    }
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    if( !( p_sys->i_tracks = MP4_BoxCount( p_sys->p_root, "/moov/trak" ) ) )
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    {
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        msg_Err( p_demux, "cannot find any /moov/trak" );
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        goto error;
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    }
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    msg_Dbg( p_demux, "find %d track%c",
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                        p_sys->i_tracks,
                        p_sys->i_tracks ? 's':' ' );
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    /* allocate memory */
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    p_sys->track = calloc( p_sys->i_tracks, sizeof( mp4_track_t ) );
    memset( p_sys->track, 0, p_sys->i_tracks * sizeof( mp4_track_t ) );
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    /* now process each track and extract all usefull information */
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    for( i = 0; i < p_sys->i_tracks; i++ )
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    {
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        p_trak = MP4_BoxGet( p_sys->p_root, "/moov/trak[%d]", i );
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        MP4_TrackCreate( p_demux, &p_sys->track[i], p_trak );
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        if( p_sys->track[i].b_ok )
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        {
            char *psz_cat;
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            switch( p_sys->track[i].fmt.i_cat )
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            {
                case( VIDEO_ES ):
                    psz_cat = "video";
                    break;
                case( AUDIO_ES ):
                    psz_cat = "audio";
                    break;
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                case( SPU_ES ):
                    psz_cat = "subtitle";
                    break;

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                default:
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                    psz_cat = "unknown";
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                    break;
            }
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            msg_Dbg( p_demux, "adding track[Id 0x%x] %s (%s) language %s",
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                            p_sys->track[i].i_track_ID,
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                            psz_cat,
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                            p_sys->track[i].b_enable ? "enable":"disable",
                            p_sys->track[i].fmt.psz_language ? p_sys->track[i].fmt.psz_language : "undef" );
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        }
        else
        {
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            msg_Dbg( p_demux, "ignoring track[Id 0x%x]", p_sys->track[i].i_track_ID );
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        }

    }
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    return VLC_SUCCESS;

error:
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    if( p_sys->p_root )
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    {
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        MP4_BoxFree( p_demux->s, p_sys->p_root );
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    }
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    free( p_sys );
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    return VLC_EGENERIC;
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}

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

    /* check for newly selected/unselected track */
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    for( i_track = 0, i_track_selected = 0; i_track < p_sys->i_tracks;
         i_track++ )
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    {
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        mp4_track_t *tk = &p_sys->track[i_track];

        if( tk->b_selected && tk->i_sample >= tk->i_sample_count )
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        {
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            msg_Warn( p_demux, "track[0x%x] will be disabled", tk->i_track_ID );
            MP4_TrackUnselect( p_demux, tk);
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        }
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        else if( tk->b_ok )
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        {
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            vlc_bool_t b;
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            es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE, tk->p_es, &b );
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            if( tk->b_selected && !b )
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            {
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                MP4_TrackUnselect( p_demux, tk );
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            }
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            else if( !tk->b_selected && b)
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            {
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                MP4_TrackSelect( p_demux, tk, MP4_GetMoviePTS( p_sys ) );
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            }

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            if( tk->b_selected )
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            {
                i_track_selected++;
            }
        }
    }

    if( i_track_selected <= 0 )
    {
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        p_sys->i_time += __MAX( p_sys->i_timescale / 10 , 1 );
        if( p_sys->i_timescale > 0 )
        {
            int64_t i_length = (mtime_t)1000000 *
                               (mtime_t)p_sys->i_duration /
                               (mtime_t)p_sys->i_timescale;
            if( MP4_GetMoviePTS( p_sys ) >= i_length )
                return 0;
            return 1;
        }

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        msg_Warn( p_demux, "no track selected, exiting..." );
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        return 0;
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    }

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    /* first wait for the good time to read a packet */
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    es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr + 1 );
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    p_sys->i_pcr = MP4_GetMoviePTS( p_sys );
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    /* we will read 100ms for each stream so ...*/
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    p_sys->i_time += __MAX( p_sys->i_timescale / 10 , 1 );
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    for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
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    {
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        mp4_track_t *tk = &p_sys->track[i_track];

        if( !tk->b_ok || !tk->b_selected )
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        {
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            continue;
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        }
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        while( MP4_TrackGetPTS( p_demux, tk ) < MP4_GetMoviePTS( p_sys ) )
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        {
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#if 0
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            msg_Dbg( p_demux, "tk=%lld mv=%lld",
                     MP4_TrackGetPTS( p_demux, tk ),
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                     MP4_GetMoviePTS( p_sys ) );
#endif

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            if( MP4_TrackSampleSize( tk ) > 0 )
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            {
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                block_t *p_block;
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                /* go,go go ! */
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                if( stream_Seek( p_demux->s, MP4_TrackGetPos( tk ) ) )
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                {
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                    msg_Warn( p_demux, "track[0x%x] will be disabled (eof?)", tk->i_track_ID );
                    MP4_TrackUnselect( p_demux, tk );
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                    break;
                }

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                /* now read pes */
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                if( ( p_block = stream_Block( p_demux->s,
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                                              MP4_TrackSampleSize( tk ) ) ) == NULL )
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                {
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                    msg_Warn( p_demux, "track[0x%x] will be disabled (eof?)", tk->i_track_ID );
                    MP4_TrackUnselect( p_demux, tk );
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                    break;
                }
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                if( tk->b_drms && tk->p_drms )
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                {
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                    drms_decrypt( tk->p_drms,
                                  (uint32_t*)p_block->p_buffer,
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                                  p_block->i_buffer );
                }
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                else if( tk->fmt.i_cat == SPU_ES )
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                {
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                    if( tk->fmt.i_codec == VLC_FOURCC( 's', 'u', 'b', 't' ) && p_block->i_buffer >= 2 )
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                    {
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                        uint16_t i_size = GetWBE( p_block->p_buffer );

                        if( i_size + 2 <= p_block->i_buffer )
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                        {
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                            char *p;
                            /* remove the length field, and append a '\0' */
                            memmove( &p_block->p_buffer[0], &p_block->p_buffer[2], i_size );
                            p_block->p_buffer[i_size] = '\0';
                            p_block->i_buffer = i_size + 1;

                            /* convert \r -> \n */
                            while( ( p = strchr( p_block->p_buffer, '\r' ) ) )
                            {
                                *p = '\n';
                            }
                        }
                        else
                        {
                            /* Invalid */
                            p_block->i_buffer = 0;
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                        }
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                    }
                }
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                p_block->i_dts = MP4_TrackGetPTS( p_demux, tk ) + 1;
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                p_block->i_pts = tk->fmt.i_cat == VIDEO_ES ? 0 : p_block->i_dts + 1;
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                if( !tk->b_drms || ( tk->b_drms && tk->p_drms ) )
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                {
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                    es_out_Send( p_demux->out, tk->p_es, p_block );
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                }
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            }
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            /* Next sample */
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            if( MP4_TrackNextSample( p_demux, tk ) )
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            {
                break;
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            }
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        }
    }

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    return 1;
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}
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/*****************************************************************************
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 * Seek: Got to i_date
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******************************************************************************/
static int Seek( demux_t *p_demux, mtime_t i_date )
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{
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    demux_sys_t *p_sys = p_demux->p_sys;
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    unsigned int i_track;
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    /* First update update global time */
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    p_sys->i_time = i_date * p_sys->i_timescale / 1000000;
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    p_sys->i_pcr  = i_date;
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    /* Now for each stream try to go to this time */
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    for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
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    {
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        mp4_track_t *tk = &p_sys->track[i_track];
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        MP4_TrackSeek( p_demux, tk, i_date );
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    }
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    return VLC_SUCCESS;
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}
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/*****************************************************************************
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 * Control:
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 *****************************************************************************/
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static int Control( demux_t *p_demux, int i_query, va_list args )
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{
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    demux_sys_t *p_sys = p_demux->p_sys;
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    double f, *pf;
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    int64_t i64, *pi64;

    switch( i_query )
    {
        case DEMUX_GET_POSITION:
            pf = (double*)va_arg( args, double * );
            if( p_sys->i_duration > 0 )
            {
                *pf = (double)p_sys->i_time / (double)p_sys->i_duration;
            }
            else
            {
                *pf = 0.0;
            }
            return VLC_SUCCESS;

        case DEMUX_SET_POSITION:
            f = (double)va_arg( args, double );
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            if( p_sys->i_timescale > 0 )
            {
                i64 = (int64_t)( f * (double)1000000 *
                                 (double)p_sys->i_duration /
                                 (double)p_sys->i_timescale );
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                return Seek( p_demux, i64 );
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            }
            else return VLC_SUCCESS;
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        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg( args, int64_t * );
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            if( p_sys->i_timescale > 0 )
            {
                *pi64 = (mtime_t)1000000 *
                        (mtime_t)p_sys->i_time /
                        (mtime_t)p_sys->i_timescale;
            }
            else *pi64 = 0;
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            return VLC_SUCCESS;

        case DEMUX_SET_TIME:
            i64 = (int64_t)va_arg( args, int64_t );
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            return Seek( p_demux, i64 );
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        case DEMUX_GET_LENGTH:
            pi64 = (int64_t*)va_arg( args, int64_t * );
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            if( p_sys->i_timescale > 0 )
            {
                *pi64 = (mtime_t)1000000 *
                        (mtime_t)p_sys->i_duration /
                        (mtime_t)p_sys->i_timescale;
            }
            else *pi64 = 0;
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            return VLC_SUCCESS;
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        case DEMUX_GET_FPS:
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            msg_Warn( p_demux, "DEMUX_GET_FPS unimplemented !!" );
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            return VLC_EGENERIC;
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        case DEMUX_GET_META:
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        {
            vlc_meta_t **pp_meta = (vlc_meta_t**)va_arg( args, vlc_meta_t** );
            vlc_meta_t *meta;
            MP4_Box_t  *p_udta   = MP4_BoxGet( p_sys->p_root, "/moov/udta" );
            MP4_Box_t  *p_0xa9xxx;
            if( p_udta == NULL )
            {
                return VLC_EGENERIC;
            }
            *pp_meta = meta = vlc_meta_New();
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            for( p_0xa9xxx = p_udta->p_first; p_0xa9xxx != NULL;
                 p_0xa9xxx = p_0xa9xxx->p_next )
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            {
                switch( p_0xa9xxx->i_type )
                {
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                case FOURCC_0xa9nam: /* Full name */
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                    vlc_meta_Add( meta, VLC_META_TITLE,
                                  p_0xa9xxx->data.p_0xa9xxx->psz_text );
                    break;
                case FOURCC_0xa9aut:
                    vlc_meta_Add( meta, VLC_META_AUTHOR,
                                  p_0xa9xxx->data.p_0xa9xxx->psz_text );
                    break;
                case FOURCC_0xa9ART:
                    vlc_meta_Add( meta, VLC_META_ARTIST,
                                  p_0xa9xxx->data.p_0xa9xxx->psz_text );
                    break;
                case FOURCC_0xa9cpy:
                    vlc_meta_Add( meta, VLC_META_COPYRIGHT,
                                  p_0xa9xxx->data.p_0xa9xxx->psz_text );
                    break;
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                case FOURCC_0xa9day: /* Creation Date */
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                    vlc_meta_Add( meta, VLC_META_DATE,
                                  p_0xa9xxx->data.p_0xa9xxx->psz_text );
                    break;
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                case FOURCC_0xa9des: /* Description */
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                    vlc_meta_Add( meta, VLC_META_DESCRIPTION,
                                  p_0xa9xxx->data.p_0xa9xxx->psz_text );
                    break;
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                case FOURCC_0xa9gen: /* Genre */
                    vlc_meta_Add( meta, VLC_META_GENRE,
                                  p_0xa9xxx->data.p_0xa9xxx->psz_text );
                    break;
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                case FOURCC_0xa9swr:
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                case FOURCC_0xa9inf: /* Information */
                case FOURCC_0xa9alb: /* Album */
                case FOURCC_0xa9dir: /* Director */
                case FOURCC_0xa9dis: /* Disclaimer */
                case FOURCC_0xa9enc: /* Encoded By */
                case FOURCC_0xa9trk: /* Track */
                case FOURCC_0xa9cmt: /* Commment */
                case FOURCC_0xa9url: /* URL */
                case FOURCC_0xa9req: /* Requirements */
                case FOURCC_0xa9fmt: /* Original Format */
                case FOURCC_0xa9dsa: /* Display Source As */
                case FOURCC_0xa9hst: /* Host Computer */
                case FOURCC_0xa9prd: /* Producer */
                case FOURCC_0xa9prf: /* Performers */
                case FOURCC_0xa9ope: /* Original Performer */
                case FOURCC_0xa9src: /* Providers Source Content */
                case FOURCC_0xa9wrt: /* Writer */
                case FOURCC_0xa9com: /* Composer */
                case FOURCC_WLOC:    /* Window Location */
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                    /* TODO one day, but they aren't really meaningfull */
                    break;

                default:
                    break;
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                }
            }
            return VLC_SUCCESS;
        }
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        case DEMUX_GET_TITLE_INFO:
        case DEMUX_SET_NEXT_DEMUX_TIME:
        case DEMUX_SET_GROUP:
            return VLC_EGENERIC;

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        default:
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            msg_Warn( p_demux, "control query unimplemented !!!" );
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            return VLC_EGENERIC;
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    }
}

/*****************************************************************************
 * Close: frees unused data
 *****************************************************************************/
static void Close ( vlc_object_t * p_this )
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{
    unsigned int i_track;
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    demux_t *  p_demux = (demux_t *)p_this;
    demux_sys_t *p_sys = p_demux->p_sys;
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    msg_Dbg( p_demux, "freeing all memory" );
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    MP4_BoxFree( p_demux->s, p_sys->p_root );
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    for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
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    {
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        MP4_TrackDestroy( p_demux, &p_sys->track[i_track] );
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    }
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    FREE( p_sys->track );
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    free( p_sys );
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}


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

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/* now create basic chunk data, the rest will be filled by MP4_CreateSamplesIndex */
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static int TrackCreateChunksIndex( demux_t *p_demux,
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                                   mp4_track_t *p_demux_track )
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{
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    MP4_Box_t *p_co64; /* give offset for each chunk, same for stco and co64 */
    MP4_Box_t *p_stsc;
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    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" ) ) ))
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    {
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        return( VLC_EGENERIC );
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    }
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    p_demux_track->i_chunk_count = p_co64->data.p_co64->i_entry_count;
    if( !p_demux_track->i_chunk_count )
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    {
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        msg_Warn( p_demux, "no chunk defined" );
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        return( VLC_EGENERIC );
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    }
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    p_demux_track->chunk = calloc( p_demux_track->i_chunk_count,
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                                   sizeof( mp4_chunk_t ) );
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    /* first we read chunk offset */
    for( i_chunk = 0; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
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    {
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        p_demux_track->chunk[i_chunk].i_offset =
                p_co64->data.p_co64->i_chunk_offset[i_chunk];
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    }

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    /* 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 )
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    {
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        msg_Warn( p_demux, "cannot read chunk table or table empty" );
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        return( VLC_EGENERIC );