zvbi.c

VLC Player Source Code

    if( (pp_block == NULL) || (*pp_block == NULL) )
        return NULL;

    p_block = *pp_block;
    *pp_block = NULL;

    p_pos = p_block->p_buffer;
    i_left = p_block->i_buffer;

    while( i_left > 0 )
    {
        vbi_sliced      p_sliced[MAX_SLICES];
        unsigned int    i_lines = 0;
        int64_t         i_pts;

        i_lines = vbi_dvb_demux_cor( p_sys->p_dvb_demux, p_sliced,
                                     MAX_SLICES, &i_pts, &p_pos, &i_left );

        if( i_lines > 0 )
            vbi_decode( p_sys->p_vbi_dec, p_sliced, i_lines, i_pts / 90000.0 );
    }

    /* */
    vlc_mutex_lock( &p_sys->lock );
    const int i_align = p_sys->i_align;
    const unsigned int i_wanted_page = p_sys->i_wanted_page;
    const bool b_opaque = p_sys->b_opaque;
    vlc_mutex_unlock( &p_sys->lock );


    /* Try to see if the page we want is in the cache yet */
    b_cached = vbi_fetch_vt_page( p_sys->p_vbi_dec, &p_page,
                                  vbi_dec2bcd( i_wanted_page ),
                                  VBI_ANY_SUBNO, VBI_WST_LEVEL_3p5,
                                  25, FALSE );

    if( i_wanted_page == p_sys->i_last_page && !p_sys->b_update )
        goto error;

    if( !b_cached )
    {
        if( p_sys->i_last_page != i_wanted_page )
        {
            /* We need to reset the subtitle */
            p_spu = Subpicture( p_dec, &fmt, true,
                                p_page.columns, p_page.rows,
                                i_align, p_block->i_pts );
            if( !p_spu )
                goto error;
            p_spu->p_region->psz_text = strdup("");

            p_sys->b_update = true;
            p_sys->i_last_page = i_wanted_page;
            goto exit;
        }
        goto error;
    }

    p_sys->b_update = false;
    p_sys->i_last_page = i_wanted_page;
#ifdef ZVBI_DEBUG
    msg_Dbg( p_dec, "we now have page: %d ready for display",
             i_wanted_page );
#endif
    /* If there is a page or sub to render, then we do that here */
    /* Create the subpicture unit */
    p_spu = Subpicture( p_dec, &fmt, p_sys->b_text,
                        p_page.columns, p_page.rows,
                        i_align, p_block->i_pts );
    if( !p_spu )
        goto error;

    if( p_sys->b_text )
    {
        unsigned int i_textsize = 7000;
        int i_total;
        char p_text[i_textsize+1];

        i_total = vbi_print_page_region( &p_page, p_text, i_textsize,
                        "UTF-8", 0, 0, 0, 0, p_page.columns, p_page.rows );
        p_text[i_total] = '\0';
        /* Strip off the pagenumber */
        if( i_total <= 40 )
            goto error;
        p_spu->p_region->psz_text = strdup( &p_text[8] );

#ifdef ZVBI_DEBUG
        msg_Info( p_dec, "page %x-%x(%d)\n%s", p_page.pgno, p_page.subno, i_total, p_text );
#endif
    }
    else
    {
        picture_t *p_pic = &p_spu->p_region->picture;

        /* ZVBI is stupid enough to assume pitch == width */
        p_pic->p->i_pitch = 4 * fmt.i_width;
        vbi_draw_vt_page( &p_page, ZVBI_PIXFMT_RGBA32,
                          p_spu->p_region->picture.p->p_pixels, 1, 1 );

        OpaquePage( p_pic, p_page, fmt, b_opaque );
    }

exit:
    vbi_unref_page( &p_page );
    block_Release( p_block );
    return p_spu;

error:
    vbi_unref_page( &p_page );
    if( p_spu != NULL )
    {
        p_dec->pf_spu_buffer_del( p_dec, p_spu );
        p_spu = NULL;
    }

    block_Release( p_block );
    return NULL;
}

static subpicture_t *Subpicture( decoder_t *p_dec, video_format_t *p_fmt,
                                 bool b_text,
                                 int i_columns, int i_rows, int i_align,
                                 mtime_t i_pts )
{
    video_format_t fmt;
    subpicture_t *p_spu;

    /* If there is a page or sub to render, then we do that here */
    /* Create the subpicture unit */
    p_spu = p_dec->pf_spu_buffer_new( p_dec );
    if( !p_spu )
    {
        msg_Warn( p_dec, "can't get spu buffer" );
        return NULL;
    }

    memset( &fmt, 0, sizeof(video_format_t) );
    fmt.i_chroma = b_text ? VLC_FOURCC('T','E','X','T') :
                                   VLC_FOURCC('R','G','B','A');
    fmt.i_aspect = b_text ? 0 : VOUT_ASPECT_FACTOR;
    if( b_text )
    {
        fmt.i_bits_per_pixel = 0;
    }
    else
    {
        fmt.i_sar_num = fmt.i_sar_den = 1;
        fmt.i_width = fmt.i_visible_width = i_columns * 12;
        fmt.i_height = fmt.i_visible_height = i_rows * 10;
        fmt.i_bits_per_pixel = 32;
    }
    fmt.i_x_offset = fmt.i_y_offset = 0;

    p_spu->p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
    if( p_spu->p_region == NULL )
    {
        msg_Err( p_dec, "cannot allocate SPU region" );
        p_dec->pf_spu_buffer_del( p_dec, p_spu );
        return NULL;
    }

    p_spu->p_region->i_x = 0;
    p_spu->p_region->i_y = 0;
    p_spu->p_region->i_align = i_align;

    /* Normal text subs, easy markup */
    p_spu->i_flags = SUBPICTURE_ALIGN_BOTTOM;

    p_spu->i_start = i_pts;
    p_spu->i_stop = 0;
    p_spu->b_ephemer = true;
    p_spu->b_absolute = false;
    p_spu->b_pausable = true;


    if( !b_text )
    {
        p_spu->i_width =
        p_spu->i_original_picture_width = fmt.i_width;
        p_spu->i_height =
        p_spu->i_original_picture_height = fmt.i_height;
    }

    /* */
    *p_fmt = fmt;
    return p_spu;
}

static void EventHandler( vbi_event *ev, void *user_data )
{
    decoder_t *p_dec        = (decoder_t *)user_data;
    decoder_sys_t *p_sys    = p_dec->p_sys;

    if( ev->type == VBI_EVENT_TTX_PAGE )
    {
#ifdef ZVBI_DEBUG
        msg_Info( p_dec, "Page %03x.%02x ",
                    ev->ev.ttx_page.pgno,
                    ev->ev.ttx_page.subno & 0xFF);
#endif
        if( p_sys->i_last_page == vbi_bcd2dec( ev->ev.ttx_page.pgno ) )
            p_sys->b_update = true;

        if( ev->ev.ttx_page.clock_update )
            msg_Dbg( p_dec, "clock" );
#ifdef ZVBI_DEBUG
        if( ev->ev.ttx_page.header_update )
            msg_Dbg( p_dec, "header" );
#endif
    }
    else if( ev->type == VBI_EVENT_CAPTION )
        msg_Dbg( p_dec, "Caption line: %x", ev->ev.caption.pgno );
    else if( ev->type == VBI_EVENT_NETWORK )
        msg_Dbg( p_dec, "Network change" );
    else if( ev->type == VBI_EVENT_ASPECT )
        msg_Dbg( p_dec, "Aspect update" );
    else if( ev->type == VBI_EVENT_NETWORK )
        msg_Dbg( p_dec, "Program info received" );
}

static int OpaquePage( picture_t *p_src, const vbi_page p_page,
                       const video_format_t fmt, bool b_opaque )
{
    unsigned int    x, y;

    assert( fmt.i_chroma == VLC_FOURCC('R','G','B','A' ) );

    /* Kludge since zvbi doesn't provide an option to specify opacity. */
    for( y = 0; y < fmt.i_height; y++ )
    {
        for( x = 0; x < fmt.i_width; x++ )
        {
            const vbi_opacity opacity = p_page.text[ y/10 * p_page.columns + x/12 ].opacity;
            uint32_t *p_pixel = (uint32_t*)&p_src->p->p_pixels[y * p_src->p->i_pitch + 4*x];
            switch( opacity )
            {
            /* Show video instead of this character */
            case VBI_TRANSPARENT_SPACE:
                *p_pixel = 0;
                break;
            /* To make the boxed text "closed captioning" transparent
             * change true to false.
             */
            case VBI_OPAQUE:
                if( b_opaque )
                    break;
            /* Full text transparency. only foreground color is show */
            case VBI_TRANSPARENT_FULL:
                *p_pixel = 0;
                break;
            /* Transparency for boxed text */
            case VBI_SEMI_TRANSPARENT:
                if( (*p_pixel) == 0xff000000 && 0 ) /* Disabled until someone implement borders */
                    *p_pixel = 0;
                break;
            }
        }
    }
    /* end of kludge */
    return VLC_SUCCESS;
}

/* Callbacks */
static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    decoder_sys_t *p_sys = p_data;
    VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);

    vlc_mutex_lock( &p_sys->lock );
    if( newval.i_int > 0 && newval.i_int < 999 )
        p_sys->i_wanted_page = newval.i_int;
    vlc_mutex_unlock( &p_sys->lock );

    return VLC_SUCCESS;
}

static int Opaque( vlc_object_t *p_this, char const *psz_cmd,
                   vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    decoder_sys_t *p_sys = p_data;
    VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);

    vlc_mutex_lock( &p_sys->lock );
    p_sys->b_opaque = newval.b_bool;
    vlc_mutex_unlock( &p_sys->lock );

    return VLC_SUCCESS;
}

static int Position( vlc_object_t *p_this, char const *psz_cmd,
                     vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    decoder_sys_t *p_sys = p_data;
    VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);

    vlc_mutex_lock( &p_sys->lock );
    p_sys->i_align = newval.i_int;
    vlc_mutex_unlock( &p_sys->lock );

    return VLC_SUCCESS;
}