static inline void backup_mb_border(H264Context *h, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr, int linesize, int uvlinesize, int simple){
    MpegEncContext * const s = &h->s;
    int i;
    int step    = 1;
    int offset  = 1;
    int uvoffset= 1;
    int top_idx = 1;
    int skiplast= 0;

    src_y  -=   linesize;
    src_cb -= uvlinesize;
    src_cr -= uvlinesize;

    if(!simple && FRAME_MBAFF){
        if(s->mb_y&1){
            offset  = MB_MBAFF ? 1 : 17;
            uvoffset= MB_MBAFF ? 1 : 9;
            if(!MB_MBAFF){
                *(uint64_t*)(h->top_borders[0][s->mb_x]+ 0)= *(uint64_t*)(src_y +  15*linesize);
                *(uint64_t*)(h->top_borders[0][s->mb_x]+ 8)= *(uint64_t*)(src_y +8+15*linesize);
                if(simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){
                    *(uint64_t*)(h->top_borders[0][s->mb_x]+16)= *(uint64_t*)(src_cb+7*uvlinesize);
                    *(uint64_t*)(h->top_borders[0][s->mb_x]+24)= *(uint64_t*)(src_cr+7*uvlinesize);
                }
            }
        }else{
            if(!MB_MBAFF){
                h->left_border[0]= h->top_borders[0][s->mb_x][15];
                if(simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){
                    h->left_border[34   ]= h->top_borders[0][s->mb_x][16+7  ];
                    h->left_border[34+18]= h->top_borders[0][s->mb_x][16+8+7];
                }
                skiplast= 1;
            }
            offset  =
            uvoffset=
            top_idx = MB_MBAFF ? 0 : 1;
        }
        step= MB_MBAFF ? 2 : 1;
    }

    // There are two lines saved, the line above the the top macroblock of a pair,
    // and the line above the bottom macroblock
    h->left_border[offset]= h->top_borders[top_idx][s->mb_x][15];
    for(i=1; i<17 - skiplast; i++){
        h->left_border[offset+i*step]= src_y[15+i*  linesize];
    }

    *(uint64_t*)(h->top_borders[top_idx][s->mb_x]+0)= *(uint64_t*)(src_y +  16*linesize);
    *(uint64_t*)(h->top_borders[top_idx][s->mb_x]+8)= *(uint64_t*)(src_y +8+16*linesize);

    if(simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){
        h->left_border[uvoffset+34   ]= h->top_borders[top_idx][s->mb_x][16+7];
        h->left_border[uvoffset+34+18]= h->top_borders[top_idx][s->mb_x][24+7];
        for(i=1; i<9 - skiplast; i++){
            h->left_border[uvoffset+34   +i*step]= src_cb[7+i*uvlinesize];
            h->left_border[uvoffset+34+18+i*step]= src_cr[7+i*uvlinesize];
        }
        *(uint64_t*)(h->top_borders[top_idx][s->mb_x]+16)= *(uint64_t*)(src_cb+8*uvlinesize);
        *(uint64_t*)(h->top_borders[top_idx][s->mb_x]+24)= *(uint64_t*)(src_cr+8*uvlinesize);
    }
}