mp4.c

video linux conference

/*****************************************************************************
 * mp4.c : MP4 file input module for vlc
 *****************************************************************************
 * Copyright (C) 2001-2004 VideoLAN
 * $Id: mp4.c 11515 2005-06-24 20:39:26Z gbazin $
 * Authors: Laurent Aimar <[e-mail]>
 *
 * 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 <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc_playlist.h>
#include "iso_lang.h"
#include "vlc_meta.h"

#include "libmp4.h"
#include "drms.h"

#ifdef UNDER_CE
#define uint64_t int64_t
#endif

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

vlc_module_begin();
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_DEMUX );
    set_description( _("MP4 stream demuxer") );
    set_capability( "demux2", 242 );
    set_callbacks( Open, Close );
vlc_module_end();

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int   Demux   ( demux_t * );
static int   DemuxRef( demux_t *p_demux ){ return 0;}
static int   Seek    ( demux_t *, mtime_t );
static int   Control ( demux_t *, int, va_list );

/* 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 */

    uint32_t     *p_sample_count_pts;
    int32_t      *p_sample_offset_pts;  /* pts-dts */

    /* 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 */
};

/*****************************************************************************
 * Declaration of local function
 *****************************************************************************/
static void MP4_TrackCreate ( demux_t *, mp4_track_t *, MP4_Box_t  *);
static void MP4_TrackDestroy( demux_t *, mp4_track_t * );

static int  MP4_TrackSelect ( demux_t *, mp4_track_t *, mtime_t );
static void MP4_TrackUnselect(demux_t *, mp4_track_t * );

static int  MP4_TrackSeek   ( demux_t *, mp4_track_t *, mtime_t );

static uint64_t MP4_TrackGetPos    ( mp4_track_t * );
static int      MP4_TrackSampleSize( mp4_track_t * );
static int      MP4_TrackNextSample( demux_t *, mp4_track_t * );
static void     MP4_TrackSetELST( demux_t *, mp4_track_t *, int64_t );

/* Return time in 祍 of a track */
static inline int64_t MP4_TrackGetDTS( demux_t *p_demux, mp4_track_t *p_track )
{
#define chunk p_track->chunk[p_track->i_chunk]

    unsigned int i_index = 0;
    unsigned int i_sample = p_track->i_sample - chunk.i_sample_first;
    int64_t i_dts = chunk.i_first_dts;

    while( i_sample > 0 )
    {
        if( i_sample > chunk.p_sample_count_dts[i_index] )
        {
            i_dts += chunk.p_sample_count_dts[i_index] *
                chunk.p_sample_delta_dts[i_index];
            i_sample -= chunk.p_sample_count_dts[i_index];
            i_index++;
        }
        else
        {
            i_dts += i_sample * chunk.p_sample_delta_dts[i_index];
            i_sample = 0;
            break;
        }
    }

#undef chunk

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

    return I64C(1000000) * i_dts / p_track->i_timescale;
}

static inline int64_t MP4_TrackGetPTSDelta( demux_t *p_demux, mp4_track_t *p_track )
{
    mp4_chunk_t *ck = &p_track->chunk[p_track->i_chunk];
    unsigned int i_index = 0;
    unsigned int i_sample = p_track->i_sample - ck->i_sample_first;

    if( ck->p_sample_count_pts == NULL || ck->p_sample_offset_pts == NULL )
        return -1;

    for( i_index = 0;; i_index++ )
    {
        if( i_sample < ck->p_sample_count_pts[i_index] )
            return ck->p_sample_offset_pts[i_index] * I64C(1000000) /
                   (int64_t)p_track->i_timescale;

        i_sample -= ck->p_sample_count_pts[i_index];
    }
}

static inline int64_t MP4_GetMoviePTS(demux_sys_t *p_sys )
{
    return I64C(1000000) * p_sys->i_time / p_sys->i_timescale;
}

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

/*****************************************************************************
 * Open: check file and initializes MP4 structures
 *****************************************************************************/
static int Open( vlc_object_t * p_this )
{
    demux_t  *p_demux = (demux_t *)p_this;
    demux_sys_t     *p_sys;

    uint8_t         *p_peek;

    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_seekable;

    /* A little test to see if it could be a mp4 */
    if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 ) 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_foov:
        case FOURCC_moof:
        case FOURCC_mdat:
        case FOURCC_udta:
        case FOURCC_free:
        case FOURCC_skip:
        case FOURCC_wide:
        case VLC_FOURCC( 'p', 'n', 'o', 't' ):
            break;
         default:
            return VLC_EGENERIC;
    }

    /* I need to seek */
    stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_seekable );
    if( !b_seekable )
    {
        msg_Warn( p_demux, "MP4 plugin discarded (unseekable)" );
        return VLC_EGENERIC;
    }

    /*Set exported functions */
    p_demux->pf_demux = Demux;
    p_demux->pf_control = Control;

    /* create our structure that will contains all data */
    p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
    memset( p_sys, 0, sizeof( demux_sys_t ) );

    /* Now load all boxes ( except raw data ) */
    if( ( p_sys->p_root = MP4_BoxGetRoot( p_demux->s ) ) == NULL )
    {
        msg_Warn( p_demux, "MP4 plugin discarded (not a valid file)" );
        goto error;
    }

    MP4_BoxDumpStructure( p_demux->s, p_sys->p_root );

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

    /* the file need to have one moov box */
    if( MP4_BoxCount( p_sys->p_root, "/moov" ) <= 0 )
    {
        MP4_Box_t *p_foov = MP4_BoxGet( p_sys->p_root, "/foov" );

        if( !p_foov )
        {
            msg_Err( p_demux, "MP4 plugin discarded (no moov box)" );
            goto error;
        }
        /* we have a free box as a moov, rename it */
        p_foov->i_type = FOURCC_moov;
    }

    if( ( p_rmra = MP4_BoxGet( p_sys->p_root,  "/moov/rmra" ) ) )
    {
        playlist_t *p_playlist;
        playlist_item_t *p_item;
        int        i_count = MP4_BoxCount( p_rmra, "rmda" );
        int        i;
        vlc_bool_t b_play = VLC_FALSE;

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

        p_playlist =
            (playlist_t *)vlc_object_find( p_demux,
                                           VLC_OBJECT_PLAYLIST,
                                           FIND_ANYWHERE );
        if( p_playlist )
        {
            p_item = playlist_LockItemGetByInput( p_playlist,
                      ((input_thread_t *)p_demux->p_parent)->input.p_item );
            playlist_ItemToNode( p_playlist, p_item );

            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_demux, "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_demux, "ignoring pseudo ref =`%s'", psz_ref );