avfilter: add lowshelf and highshelf filters

Multimedia / FFmpeg - Paul B Mahol [gmail.com] - 17 April 2018 10:40 EDT

These are old bass and treble filters. Make bass and treble filters better at boosting.

2fc12f4971 avfilter: add lowshelf and highshelf filters
doc/filters.texi | 4 +--
libavfilter/Makefile | 2 ++
libavfilter/af_biquads.c | 78 ++++++++++++++++++++++++++++++++++++++++++------
libavfilter/allfilters.c | 2 ++
libavfilter/version.h | 2 +-
5 files changed, 76 insertions(+), 12 deletions(-)

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