get_band_edge     841 libavfilter/af_afftdn.c     s->noise_band_edge[0] = FFMIN(s->fft_length2, s->fft_length * get_band_edge(s, 0) / s->sample_rate);
get_band_edge     844 libavfilter/af_afftdn.c         s->noise_band_edge[j] = FFMIN(s->fft_length2, s->fft_length * get_band_edge(s, j) / s->sample_rate);