static av_always_inline void rv40_adaptive_loop_filter(uint8_t *src, const int step,
                                             const int stride, const int dmode,
                                             const int lim_q1, const int lim_p1,
                                             const int alpha,
                                             const int beta, const int beta2,
                                             const int chroma, const int edge)
{
    int diff_p1p0[4], diff_q1q0[4], diff_p1p2[4], diff_q1q2[4];
    int sum_p1p0 = 0, sum_q1q0 = 0, sum_p1p2 = 0, sum_q1q2 = 0;
    uint8_t *ptr;
    int flag_strong0 = 1, flag_strong1 = 1;
    int filter_p1, filter_q1;
    int i;
    int lims;

    for(i = 0, ptr = src; i < 4; i++, ptr += stride){
        diff_p1p0[i] = ptr[-2*step] - ptr[-1*step];
        diff_q1q0[i] = ptr[ 1*step] - ptr[ 0*step];
        sum_p1p0 += diff_p1p0[i];
        sum_q1q0 += diff_q1q0[i];
    }
    filter_p1 = FFABS(sum_p1p0) < (beta<<2);
    filter_q1 = FFABS(sum_q1q0) < (beta<<2);
    if(!filter_p1 && !filter_q1)
        return;

    for(i = 0, ptr = src; i < 4; i++, ptr += stride){
        diff_p1p2[i] = ptr[-2*step] - ptr[-3*step];
        diff_q1q2[i] = ptr[ 1*step] - ptr[ 2*step];
        sum_p1p2 += diff_p1p2[i];
        sum_q1q2 += diff_q1q2[i];
    }

    if(edge){
        flag_strong0 = filter_p1 && (FFABS(sum_p1p2) < beta2);
        flag_strong1 = filter_q1 && (FFABS(sum_q1q2) < beta2);
    }else{
        flag_strong0 = flag_strong1 = 0;
    }

    lims = filter_p1 + filter_q1 + ((lim_q1 + lim_p1) >> 1) + 1;
    if(flag_strong0 && flag_strong1){ /* strong filtering */
        for(i = 0; i < 4; i++, src += stride){
            int sflag, p0, q0, p1, q1;
            int t = src[0*step] - src[-1*step];

            if(!t) continue;
            sflag = (alpha * FFABS(t)) >> 7;
            if(sflag > 1) continue;

            p0 = (25*src[-3*step] + 26*src[-2*step]
                + 26*src[-1*step]
                + 26*src[ 0*step] + 25*src[ 1*step] + rv40_dither_l[dmode + i]) >> 7;
            q0 = (25*src[-2*step] + 26*src[-1*step]
                + 26*src[ 0*step]
                + 26*src[ 1*step] + 25*src[ 2*step] + rv40_dither_r[dmode + i]) >> 7;
            if(sflag){
                p0 = av_clip(p0, src[-1*step] - lims, src[-1*step] + lims);
                q0 = av_clip(q0, src[ 0*step] - lims, src[ 0*step] + lims);
            }
            p1 = (25*src[-4*step] + 26*src[-3*step]
                + 26*src[-2*step]
                + 26*p0           + 25*src[ 0*step] + rv40_dither_l[dmode + i]) >> 7;
            q1 = (25*src[-1*step] + 26*q0
                + 26*src[ 1*step]
                + 26*src[ 2*step] + 25*src[ 3*step] + rv40_dither_r[dmode + i]) >> 7;
            if(sflag){
                p1 = av_clip(p1, src[-2*step] - lims, src[-2*step] + lims);
                q1 = av_clip(q1, src[ 1*step] - lims, src[ 1*step] + lims);
            }
            src[-2*step] = p1;
            src[-1*step] = p0;
            src[ 0*step] = q0;
            src[ 1*step] = q1;
            if(!chroma){
                src[-3*step] = (25*src[-1*step] + 26*src[-2*step] + 51*src[-3*step] + 26*src[-4*step] + 64) >> 7;
                src[ 2*step] = (25*src[ 0*step] + 26*src[ 1*step] + 51*src[ 2*step] + 26*src[ 3*step] + 64) >> 7;
            }
        }
    }else if(filter_p1 && filter_q1){
        for(i = 0; i < 4; i++, src += stride)
            rv40_weak_loop_filter(src, step, 1, 1, alpha, beta, lims, lim_q1, lim_p1,
                                  diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]);
    }else{
        for(i = 0; i < 4; i++, src += stride)
            rv40_weak_loop_filter(src, step, filter_p1, filter_q1,
                                  alpha, beta, lims>>1, lim_q1>>1, lim_p1>>1,
                                  diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]);
    }
}