static int find_optimal_param(uint32_t sum, int n)

{

    int k;

    uint32_t sum2;



    if (sum <= n >> 1)

        return 0;

    sum2 = sum - (n >> 1);

    k    = av_log2(n < 256 ? FASTDIV(sum2, n) : sum2 / n);

    return FFMIN(k, MAX_RICE_PARAM);

}
