avfilter: add lowshelf and highshelf filters
These are old bass and treble filters.
Make bass and treble filters better at boosting.
Signed-off-by: NPaul B Mahol <onemda@gmail.com>
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These are old bass and treble filters.
Make bass and treble filters better at boosting.
Signed-off-by: NPaul B Mahol <onemda@gmail.com>