WFUNC_BLACKMAN     89 libavfilter/avf_showspectrum.c         { "blackman", "Blackman window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
WFUNC_BLACKMAN    229 libavfilter/avf_showspectrum.c         case WFUNC_BLACKMAN: {