biquad             72 libavfilter/af_aemphasis.c static inline double biquad(BiquadD2 *bq, double in)
biquad            378 libavfilter/af_arnndn.c static void biquad(float *y, float mem[2], const float *x,
biquad             73 libavfilter/af_biquads.c     biquad,