Function swr_get_delay

libswresample/swresample.c:879–885

}

int64_t swr_get_delay(struct SwrContext *s, int64_t base){
    if (s->resampler && s->resample){
        return s->resampler->get_delay(s, base);
    }else{
        return (s->in_buffer_count*base + (s->in_sample_rate>>1))/ s->in_sample_rate;
    }
}

int swr_get_out_samples(struct SwrContext *s, int in_samples)
{