if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){
int64_t index2= (1LL<<32)*c->frac/c->src_incr + (1LL<<32)*index;
int64_t incr= (1LL<<32) * c->dst_incr / c->src_incr;
if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){
int64_t index2= (1LL<<32)*c->frac/c->src_incr + (1LL<<32)*index;
int64_t incr= (1LL<<32) * c->dst_incr / c->src_incr;