int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd); 

 int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){

     int64_t r=;

     av_assert2(c > );

     av_assert2(b >=);

     av_assert2((unsigned)(rnd&~AV_ROUND_PASS_MINMAX)<= && (rnd&~AV_ROUND_PASS_MINMAX)!=);

     if (c <=  || b <  || !((unsigned)(rnd&~AV_ROUND_PASS_MINMAX)<= && (rnd&~AV_ROUND_PASS_MINMAX)!=))

         return INT64_MIN;

     if (rnd & AV_ROUND_PASS_MINMAX) {

         if (a == INT64_MIN || a == INT64_MAX)

             return a;

         rnd -= AV_ROUND_PASS_MINMAX;

     }

     if(a< && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>)&));

     if(rnd==AV_ROUND_NEAR_INF) r= c/;

     else if(rnd&)             r= c-;

     if(b<=INT_MAX && c<=INT_MAX){

         if(a<=INT_MAX)

             return (a * b + r)/c;

         else

             return a/c*b + (a%c*b + r)/c;

     }else{

 #if 1

         uint64_t a0= a&0xFFFFFFFF;

         uint64_t a1= a>>;

         uint64_t b0= b&0xFFFFFFFF;

         uint64_t b1= b>>;

         uint64_t t1= a0*b1 + a1*b0;

         uint64_t t1a= t1<<;

         int i;

         a0 = a0*b0 + t1a;

         a1 = a1*b1 + (t1>>) + (a0<t1a);

         a0 += r;

         a1 += a0<r;

         for(i=; i>=; i--){

 //            int o= a1 & 0x8000000000000000ULL;

             a1+= a1 + ((a0>>i)&);

             t1+=t1;

             if(/*o || */c <= a1){

                 a1 -= c;

                 t1++;

             }

         }

         return t1;

     }

 #else

         AVInteger ai;

         ai= av_mul_i(av_int2i(a), av_int2i(b));

         ai= av_add_i(ai, av_int2i(r));

         return av_i2int(av_div_i(ai, av_int2i(c)));

     }

 #endif

 }

 av_rescale_q(a=-,

              bq={num=, den=},

              cq={num=, den=))

 {

   int64_t b= bq.num * (int64_t)cq.den; // = 1 * 90000   = 90000;

   int64_t c= cq.num * (int64_t)bq.den; // = 1 * 1000000 = 1000000

   return av_rescale_rnd(a, b, c, );

 }

 av_rescale_rnd(a=, b=, c=, rnd=)

 {

   if (rnd==)

     r = c / ;                          // r =500000;

   if (b<=INT_MAX && c<=INT_MAX)

   {

     if (a<=INT_MAX)

       return (a * b + r)/c;

     else

       return a/c*b + (a%c*b + r)/c;    // =  10949117256 / 1000000 * 90000 +

                                        //   (10949117256 % 1000000 * 90000 + 500000) / 1000000

                                        // =  985420553

   }

   else

   {

     ...

   }

 }