static void vc1_inv_trans_4x8_dc_c(uint8_t *dest, int linesize, DCTELEM *block)
{
    int i;
    int dc = block[0];
    dc = (17 * dc +  4) >> 3;
    dc = (12 * dc + 64) >> 7;
    for(i = 0; i < 8; i++){
        dest[0] = av_clip_uint8(dest[0] + dc);
        dest[1] = av_clip_uint8(dest[1] + dc);
        dest[2] = av_clip_uint8(dest[2] + dc);
        dest[3] = av_clip_uint8(dest[3] + dc);
        dest += linesize;
    }
}