avfilter/avf_showspectrum: improve dBFS scale legend
authorPaul B Mahol <onemda@gmail.com>
Fri, 6 Aug 2021 20:03:07 +0000 (22:03 +0200)
committerPaul B Mahol <onemda@gmail.com>
Sat, 7 Aug 2021 11:08:48 +0000 (13:08 +0200)
commit6b11c12cf33b9761c3ac460737728228e86e9f04
treefdbeda96f21d02d868093ff7ab2eedff34311ba3
parente01d306c647b5827102260b885faa223b646d2d1
avfilter/avf_showspectrum: improve dBFS scale legend

Make it more intuitive looking and correct for non-log scaling.
Add option to set upper limit of input audio value in dBFS.
doc/filters.texi
libavfilter/avf_showspectrum.c