const int uvstride= c->uvstride;
static inline int h263_mv4_search(MpegEncContext *s, int mx, int my, int shift){    MotionEstContext * const c= &s->me;    const int size= 1;    const int h=8;    int block;    int P[10][2];    int dmin_sum=0, mx4_sum=0, my4_sum=0;    int same=1;    const int stride= c->stride;    const int uvstride= c->uvstride;    uint8_t *mv_penalty= c->current_mv_penalty;    init_mv4_ref(c);        for(block=0; block<4; block++){        int mx4, my4;        int pred_x4, pred_y4;        int dmin4;        static const int off[4]= {2, 1, 1, -1};        const int mot_stride = s->b8_stride;        const int mot_xy = s->block_index[block];        P_LEFT[0] = s->current_picture.motion_val[0][mot_xy - 1][0];        P_LEFT[1] = s->current_picture.motion_val[0][mot_xy - 1][1];        if(P_LEFT[0]       > (c->xmax<<shift)) P_LEFT[0]       = (c->xmax<<shift);        /* special case for first line */        if (s->first_slice_line && block<2) {            c->pred_x= pred_x4= P_LEFT[0];            c->pred_y= pred_y4= P_LEFT[1];        } else {            P_TOP[0]      = s->current_picture.motion_val[0][mot_xy - mot_stride             ][0];            P_TOP[1]      = s->current_picture.motion_val[0][mot_xy - mot_stride             ][1];            P_TOPRIGHT[0] = s->current_picture.motion_val[0][mot_xy - mot_stride + off[block]][0];            P_TOPRIGHT[1] = s->current_picture.motion_val[0][mot_xy - mot_stride + off[block]][1];            if(P_TOP[1]      > (c->ymax<<shift)) P_TOP[1]     = (c->ymax<<shift);            if(P_TOPRIGHT[0] < (c->xmin<<shift)) P_TOPRIGHT[0]= (c->xmin<<shift);            if(P_TOPRIGHT[0] > (c->xmax<<shift)) P_TOPRIGHT[0]= (c->xmax<<shift);            if(P_TOPRIGHT[1] > (c->ymax<<shift)) P_TOPRIGHT[1]= (c->ymax<<shift);                P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);            P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);            c->pred_x= pred_x4 = P_MEDIAN[0];            c->pred_y= pred_y4 = P_MEDIAN[1];        }        P_MV1[0]= mx;        P_MV1[1]= my;        dmin4 = epzs_motion_search4(s, &mx4, &my4, P, block, block, s->p_mv_table, (1<<16)>>shift);        dmin4= c->sub_motion_search(s, &mx4, &my4, dmin4, block, block, size, h);                if(s->dsp.me_sub_cmp[0] != s->dsp.mb_cmp[0]){            int dxy;            const int offset= ((block&1) + (block>>1)*stride)*8;            uint8_t *dest_y = c->scratchpad + offset;            if(s->quarter_sample){                uint8_t *ref= c->ref[block][0] + (mx4>>2) + (my4>>2)*stride;                dxy = ((my4 & 3) << 2) | (mx4 & 3);                if(s->no_rounding)                    s->dsp.put_no_rnd_qpel_pixels_tab[1][dxy](dest_y   , ref    , stride);                else                    s->dsp.put_qpel_pixels_tab       [1][dxy](dest_y   , ref    , stride);            }else{                uint8_t *ref= c->ref[block][0] + (mx4>>1) + (my4>>1)*stride;                dxy = ((my4 & 1) << 1) | (mx4 & 1);                if(s->no_rounding)                    s->dsp.put_no_rnd_pixels_tab[1][dxy](dest_y    , ref    , stride, h);                else                    s->dsp.put_pixels_tab       [1][dxy](dest_y    , ref    , stride, h);            }            dmin_sum+= (mv_penalty[mx4-pred_x4] + mv_penalty[my4-pred_y4])*c->mb_penalty_factor;        }else            dmin_sum+= dmin4;        if(s->quarter_sample){            mx4_sum+= mx4/2;            my4_sum+= my4/2;        }else{            mx4_sum+= mx4;            my4_sum+= my4;        }                    s->current_picture.motion_val[0][ s->block_index[block] ][0]= mx4;        s->current_picture.motion_val[0][ s->block_index[block] ][1]= my4;        if(mx4 != mx || my4 != my) same=0;    }        if(same)        return INT_MAX;        if(s->dsp.me_sub_cmp[0] != s->dsp.mb_cmp[0]){        dmin_sum += s->dsp.mb_cmp[0](s, s->new_picture.data[0] + s->mb_x*16 + s->mb_y*16*stride, c->scratchpad, stride, 16);    }        if(c->avctx->mb_cmp&FF_CMP_CHROMA){        int dxy;        int mx, my;        int offset;        mx= ff_h263_round_chroma(mx4_sum);        my= ff_h263_round_chroma(my4_sum);        dxy = ((my & 1) << 1) | (mx & 1);                offset= (s->mb_x*8 + (mx>>1)) + (s->mb_y*8 + (my>>1))*s->uvlinesize;               if(s->no_rounding){            s->dsp.put_no_rnd_pixels_tab[1][dxy](c->scratchpad    , s->last_picture.data[1] + offset, s->uvlinesize, 8);            s->dsp.put_no_rnd_pixels_tab[1][dxy](c->scratchpad+8  , s->last_picture.data[2] + offset, s->uvlinesize, 8);        }else{            s->dsp.put_pixels_tab       [1][dxy](c->scratchpad    , s->last_picture.data[1] + offset, s->uvlinesize, 8);            s->dsp.put_pixels_tab       [1][dxy](c->scratchpad+8  , s->last_picture.data[2] + offset, s->uvlinesize, 8);        }        dmin_sum += s->dsp.mb_cmp[1](s, s->new_picture.data[1] + s->mb_x*8 + s->mb_y*8*s->uvlinesize, c->scratchpad  , s->uvlinesize, 8);        dmin_sum += s->dsp.mb_cmp[1](s, s->new_picture.data[2] + s->mb_x*8 + s->mb_y*8*s->uvlinesize, c->scratchpad+8, s->uvlinesize, 8);    }        c->pred_x= mx;    c->pred_y= my;    switch(c->avctx->mb_cmp&0xFF){    /*case FF_CMP_SSE:        return dmin_sum+ 32*s->qscale*s->qscale;*/    case FF_CMP_RD:        return dmin_sum;    default:        return dmin_sum+ 11*c->mb_penalty_factor;    }}