BIQUAD_FILTER 257 libavfilter/af_biquads.c BIQUAD_FILTER(s32, int32_t, INT32_MIN, INT32_MAX, 1) BIQUAD_FILTER 258 libavfilter/af_biquads.c BIQUAD_FILTER(flt, float, -1., 1., 0) BIQUAD_FILTER 259 libavfilter/af_biquads.c BIQUAD_FILTER(dbl, double, -1., 1., 0)