NB_ASCALES         32 libavfilter/avf_ahistogram.c enum AmplitudeScale { ALINEAR, ALOG, NB_ASCALES };
NB_ASCALES         42 libavfilter/avf_showfreqs.c enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES };