static int64_t get_delay(struct SwrContext *s, int64_t base){
ResampleContext *c = s->resample;
int64_t num = s->in_buffer_count - (c->filter_length-1)/2;
- num <<= c->phase_shift;
+ num *= 1 << c->phase_shift;
num -= c->index;
num *= c->src_incr;
num -= c->frac;