subtitle_asa.c

VLC Player Source Code

    {
        es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','u','b','t' ) );
    }
    p_sys->es = es_out_Add( p_demux->out, &fmt );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * ProcessLine: Callback for asa_import, fed one line
 * (note: return values are not kept. nonzero signals abort to asa_import)
 *****************************************************************************/
static int ProcessLine( demux_t *p_demux, void *p_arg,
                         int64_t i_start, int64_t i_stop,
                         const char *p_buffer, size_t i_buffer_length )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    subtitle_t *p_subtitle;
    char *psz_text;

    VLC_UNUSED(p_arg);

    if( p_sys->i_subtitles >= p_sys->i_subs_alloc )
    {
        p_sys->i_subs_alloc += 500;
        if( !( p_sys->subtitle = realloc( p_sys->subtitle, sizeof(subtitle_t)
                                          * p_sys->i_subs_alloc ) ) )
        {
            return VLC_ENOMEM;
        }
    }
    p_subtitle = &p_sys->subtitle[p_sys->i_subtitles];

    psz_text = malloc( i_buffer_length + 1 );
    if( !psz_text )
        return VLC_ENOMEM;
    memcpy( psz_text, p_buffer, i_buffer_length );
    psz_text[i_buffer_length] = '\0';

    p_subtitle->i_start = i_start;
    p_subtitle->i_stop  = i_stop;
    p_subtitle->psz_text = psz_text;

    p_sys->i_subtitles++;
    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: Close subtitle demux
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    demux_t *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys = p_demux->p_sys;
    int i;

    for( i = 0; i < p_sys->i_subtitles; i++ )
        free( p_sys->subtitle[i].psz_text );
    free( p_sys->subtitle );

    free( p_sys );
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int64_t *pi64, i64;
    double *pf, f;

    switch( i_query )
    {
        case DEMUX_GET_LENGTH:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            *pi64 = p_sys->i_length;
            return VLC_SUCCESS;

        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            if( p_sys->i_subtitle < p_sys->i_subtitles )
            {
                *pi64 = p_sys->subtitle[p_sys->i_subtitle].i_start;
                return VLC_SUCCESS;
            }
            return VLC_EGENERIC;

        case DEMUX_SET_TIME:
            i64 = (int64_t)va_arg( args, int64_t );
            p_sys->i_subtitle = 0;
            while( p_sys->i_subtitle < p_sys->i_subtitles &&
                   p_sys->subtitle[p_sys->i_subtitle].i_start < i64 )
            {
                p_sys->i_subtitle++;
            }

            if( p_sys->i_subtitle >= p_sys->i_subtitles )
                return VLC_EGENERIC;
            return VLC_SUCCESS;

        case DEMUX_GET_POSITION:
            pf = (double*)va_arg( args, double * );
            if( p_sys->i_subtitle >= p_sys->i_subtitles )
            {
                *pf = 1.0;
            }
            else if( p_sys->i_subtitles > 0 )
            {
                *pf = (double)p_sys->subtitle[p_sys->i_subtitle].i_start /
                      (double)p_sys->i_length;
            }
            else
            {
                *pf = 0.0;
            }
            return VLC_SUCCESS;

        case DEMUX_SET_POSITION:
            f = (double)va_arg( args, double );
            i64 = f * p_sys->i_length;

            p_sys->i_subtitle = 0;
            while( p_sys->i_subtitle < p_sys->i_subtitles &&
                   p_sys->subtitle[p_sys->i_subtitle].i_start < i64 )
            {
                p_sys->i_subtitle++;
            }
            if( p_sys->i_subtitle >= p_sys->i_subtitles )
                return VLC_EGENERIC;
            return VLC_SUCCESS;

        case DEMUX_SET_NEXT_DEMUX_TIME:
            p_sys->i_next_demux_date = (int64_t)va_arg( args, int64_t );
            return VLC_SUCCESS;

        case DEMUX_GET_FPS:
        case DEMUX_GET_META:
        case DEMUX_GET_ATTACHMENTS:
        case DEMUX_GET_TITLE_INFO:
            return VLC_EGENERIC;

        default:
            msg_Err( p_demux, "unknown query in subtitle control" );
            return VLC_EGENERIC;
    }
}

/*****************************************************************************
 * Demux: Send subtitle to decoder
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int64_t i_maxdate;

    if( p_sys->i_subtitle >= p_sys->i_subtitles )
        return 0;

    i_maxdate = p_sys->i_next_demux_date - var_GetTime( p_demux->p_parent, "spu-delay" );;
    if( i_maxdate <= 0 && p_sys->i_subtitle < p_sys->i_subtitles )
    {
        /* Should not happen */
        i_maxdate = p_sys->subtitle[p_sys->i_subtitle].i_start + 1;
    }

    while( p_sys->i_subtitle < p_sys->i_subtitles &&
           p_sys->subtitle[p_sys->i_subtitle].i_start < i_maxdate )
    {
        block_t *p_block;
        int i_len = strlen( p_sys->subtitle[p_sys->i_subtitle].psz_text ) + 1;

        if( i_len <= 1 )
        {
            /* empty subtitle */
            p_sys->i_subtitle++;
            continue;
        }

        if( ( p_block = block_New( p_demux, i_len ) ) == NULL )
        {
            p_sys->i_subtitle++;
            continue;
        }

        if( p_sys->subtitle[p_sys->i_subtitle].i_start < 0 )
        {
            p_sys->i_subtitle++;
            continue;
        }

        p_block->i_pts = p_sys->subtitle[p_sys->i_subtitle].i_start;
        p_block->i_dts = p_block->i_pts;
        if( p_sys->subtitle[p_sys->i_subtitle].i_stop > 0 )
        {
            p_block->i_length =
                p_sys->subtitle[p_sys->i_subtitle].i_stop - p_block->i_pts;
        }

        memcpy( p_block->p_buffer,
                p_sys->subtitle[p_sys->i_subtitle].psz_text, i_len );
        if( p_block->i_pts > 0 )
        {
            es_out_Send( p_demux->out, p_sys->es, p_block );
        }
        else
        {
            block_Release( p_block );
        }
        p_sys->i_subtitle++;
    }

    /* */
    p_sys->i_next_demux_date = 0;

    return 1;
}

/*****************************************************************************
 * Fix: fix time stamp and order of subtitle
 *****************************************************************************/
static void Fix( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    bool b_done;
    int     i_index;

    /* *** fix order (to be sure...) *** */
    /* We suppose that there are near in order and this durty bubble sort
     * wont take too much time
     */
    do
    {
        b_done = true;
        for( i_index = 1; i_index < p_sys->i_subtitles; i_index++ )
        {
            if( p_sys->subtitle[i_index].i_start <
                    p_sys->subtitle[i_index - 1].i_start )
            {
                subtitle_t sub_xch;
                memcpy( &sub_xch,
                        p_sys->subtitle + i_index - 1,
                        sizeof( subtitle_t ) );
                memcpy( p_sys->subtitle + i_index - 1,
                        p_sys->subtitle + i_index,
                        sizeof( subtitle_t ) );
                memcpy( p_sys->subtitle + i_index,
                        &sub_xch,
                        sizeof( subtitle_t ) );
                b_done = false;
            }
        }
    } while( !b_done );
}