mp4.c

VLC Player Source Code

        {
            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 = strdup( 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 );
                    continue;
                }
                if( !strncmp( psz_ref, "http://", 7 ) ||
                    !strncmp( psz_ref, "rtsp://", 7 ) )
                {
                    ;
                }
                else
                {
                    char *psz_absolute;
                    char *psz_path = strdup( p_demux->psz_path );
                    char *end = strrchr( psz_path, '/' );
                    if( end ) end[1] = '\0';
                    else *psz_path = '\0';

                    if( asprintf( &psz_absolute, "%s://%s%s",
                                  p_demux->psz_access, psz_path, psz_ref ) < 0 )
                        return VLC_ENOMEM;

                    free( psz_ref );
                    psz_ref = psz_absolute;
                    free( psz_path );
                }
                input_item_t *p_input;
                msg_Dbg( p_demux, "adding ref = `%s'", psz_ref );
                p_input = input_item_NewExt( p_demux, psz_ref, NULL,
                                    0, NULL, -1 );
                input_item_CopyOptions( p_current, p_input );
                input_item_AddSubItem( p_current, p_input );
                vlc_gc_decref( p_input );
            }
            else
            {
                msg_Err( p_demux, "unknown ref type=%4.4s FIXME (send a bug report)",
                         (char*)&p_rdrf->data.p_rdrf->i_ref_type );
            }
            free( psz_ref );
        }
        vlc_object_release( p_input );
    }

    if( !(p_mvhd = MP4_BoxGet( p_sys->p_root, "/moov/mvhd" ) ) )
    {
        if( !p_rmra )
        {
            msg_Err( p_demux, "cannot find /moov/mvhd" );
            goto error;
        }
        else
        {
            msg_Warn( p_demux, "cannot find /moov/mvhd (pure ref file)" );
            p_demux->pf_demux = DemuxRef;
            return VLC_SUCCESS;
        }
    }
    else
    {
        p_sys->i_timescale = p_mvhd->data.p_mvhd->i_timescale;
        if( p_sys->i_timescale == 0 )
        {
            msg_Err( p_this, "bad timescale" );
            goto error;
        }
        p_sys->i_duration = p_mvhd->data.p_mvhd->i_duration;
    }

    if( !( p_sys->i_tracks = MP4_BoxCount( p_sys->p_root, "/moov/trak" ) ) )
    {
        msg_Err( p_demux, "cannot find any /moov/trak" );
        goto error;
    }
    msg_Dbg( p_demux, "found %d track%c",
                        p_sys->i_tracks,
                        p_sys->i_tracks ? 's':' ' );

    /* allocate memory */
    p_sys->track = calloc( p_sys->i_tracks, sizeof( mp4_track_t ) );
    if( p_sys->track == NULL )
        goto error;
    memset( p_sys->track, 0, p_sys->i_tracks * sizeof( mp4_track_t ) );

    /* Search the first chap reference (like quicktime) and
     * check that at least 1 stream is enabled */
    p_sys->p_tref_chap = NULL;
    b_enabled_es = false;
    for( i = 0; i < p_sys->i_tracks; i++ )
    {
        MP4_Box_t *p_trak = MP4_BoxGet( p_sys->p_root, "/moov/trak[%d]", i );


        MP4_Box_t *p_tkhd = MP4_BoxGet( p_trak, "tkhd" );
        if( p_tkhd && (p_tkhd->data.p_tkhd->i_flags&MP4_TRACK_ENABLED) )
            b_enabled_es = true;

        MP4_Box_t *p_chap = MP4_BoxGet( p_trak, "tref/chap", i );
        if( p_chap && p_chap->data.p_tref_generic->i_entry_count > 0 && !p_sys->p_tref_chap )
            p_sys->p_tref_chap = p_chap;
    }

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

        if( p_sys->track[i].b_ok && !p_sys->track[i].b_chapter )
        {
            const char *psz_cat;
            switch( p_sys->track[i].fmt.i_cat )
            {
                case( VIDEO_ES ):
                    psz_cat = "video";
                    break;
                case( AUDIO_ES ):
                    psz_cat = "audio";
                    break;
                case( SPU_ES ):
                    psz_cat = "subtitle";
                    break;

                default:
                    psz_cat = "unknown";
                    break;
            }

            msg_Dbg( p_demux, "adding track[Id 0x%x] %s (%s) language %s",
                     p_sys->track[i].i_track_ID, psz_cat,
                     p_sys->track[i].b_enable ? "enable":"disable",
                     p_sys->track[i].fmt.psz_language ?
                     p_sys->track[i].fmt.psz_language : "undef" );
        }
        else if( p_sys->track[i].b_ok && p_sys->track[i].b_chapter )
        {
            msg_Dbg( p_demux, "using track[Id 0x%x] for chapter language %s",
                     p_sys->track[i].i_track_ID,
                     p_sys->track[i].fmt.psz_language ?
                     p_sys->track[i].fmt.psz_language : "undef" );
        }
        else
        {
            msg_Dbg( p_demux, "ignoring track[Id 0x%x]",
                     p_sys->track[i].i_track_ID );
        }
    }

    /* */
    LoadChapter( p_demux );

    return VLC_SUCCESS;

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

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


    unsigned int i_track_selected;

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

        if( !tk->b_ok || tk->b_chapter ||
            ( tk->b_selected && tk->i_sample >= tk->i_sample_count ) )
        {
            continue;
        }

        es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE, tk->p_es, &b );

        if( tk->b_selected && !b )
        {
            MP4_TrackUnselect( p_demux, tk );
        }
        else if( !tk->b_selected && b)
        {
            MP4_TrackSelect( p_demux, tk, MP4_GetMoviePTS( p_sys ) );
        }

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

    if( i_track_selected <= 0 )
    {
        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;
        }

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

    /* */
    MP4_UpdateSeekpoint( p_demux );

    /* first wait for the good time to read a packet */
    es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr + 1 );

    p_sys->i_pcr = MP4_GetMoviePTS( p_sys );

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

    for( i_track = 0; i_track < p_sys->i_tracks; i_track++ )
    {
        mp4_track_t *tk = &p_sys->track[i_track];

        if( !tk->b_ok || tk->b_chapter || !tk->b_selected || tk->i_sample >= tk->i_sample_count )
            continue;

        while( MP4_TrackGetDTS( p_demux, tk ) < MP4_GetMoviePTS( p_sys ) )
        {
#if 0
            msg_Dbg( p_demux, "tk(%i)=%lld mv=%lld", i_track,
                     MP4_TrackGetDTS( p_demux, tk ),
                     MP4_GetMoviePTS( p_sys ) );
#endif

            if( MP4_TrackSampleSize( tk ) > 0 )
            {
                block_t *p_block;
                int64_t i_delta;

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

                /* now read pes */
                if( !(p_block =
                         stream_Block( p_demux->s, MP4_TrackSampleSize(tk) )) )
                {
                    msg_Warn( p_demux, "track[0x%x] will be disabled (eof?)",
                              tk->i_track_ID );
                    MP4_TrackUnselect( p_demux, tk );
                    break;
                }

                if( tk->b_drms && tk->p_drms )
                {
                    drms_decrypt( tk->p_drms, (uint32_t*)p_block->p_buffer,
                                  p_block->i_buffer );
                }
                else if( tk->fmt.i_cat == SPU_ES )
                {
                    if( tk->fmt.i_codec == VLC_FOURCC( 's', 'u', 'b', 't' ) &&
                        p_block->i_buffer >= 2 )
                    {
                        uint16_t i_size = GetWBE( p_block->p_buffer );

                        if( i_size + 2 <= p_block->i_buffer )
                        {
                            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((char *) p_block->p_buffer, '\r' ) ) )
                            {
                                *p = '\n';
                            }
                        }
                        else
                        {
                            /* Invalid */
                            p_block->i_buffer = 0;
                        }
                    }
                }
                /* dts */
                p_block->i_dts = MP4_TrackGetDTS( p_demux, tk ) + 1;
                /* pts */
                i_delta = MP4_TrackGetPTSDelta( tk );
                if( i_delta != -1 )
                    p_block->i_pts = p_block->i_dts + i_delta;
                else if( tk->fmt.i_cat != VIDEO_ES )
                    p_block->i_pts = p_block->i_dts;
                else
                    p_block->i_pts = 0;

                if( !tk->b_drms || ( tk->b_drms && tk->p_drms ) )
                    es_out_Send( p_demux->out, tk->p_es, p_block );
            }

            /* Next sample */
            if( MP4_TrackNextSample( p_demux, tk ) )
                break;
        }
    }

    return 1;
}

static void MP4_UpdateSeekpoint( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int64_t i_time;
    int i;
    if( !p_sys->p_title )
        return;
    i_time = MP4_GetMoviePTS( p_sys );
    for( i = 0; i < p_sys->p_title->i_seekpoint; i++ )
    {
        if( i_time < p_sys->p_title->seekpoint[i]->i_time_offset )
            break;
    }
    i--;

    if( i != p_demux->info.i_seekpoint && i >= 0 )
    {
        p_demux->info.i_seekpoint = i;
        p_demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
    }
}
/*****************************************************************************
 * Seek: Got to i_date
******************************************************************************/
static int Seek( demux_t *p_demux, mtime_t i_date )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    unsigned int i_track;