avfilter: add multiband compand filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 4a35c44c7b..5d99437871 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3270,6 +3270,22 @@ lowpass=c=LFE
 @end example
 @end itemize
 
+@section mcompand
+Multiband Compress or expand the audio's dynamic range.
+
+The input audio is divided into bands using 4th order Linkwitz-Riley IIRs.
+This is akin to the crossover of a loudspeaker, and results in flat frequency
+response when absent compander action.
+
+It accepts the following parameters:
+
+@table @option
+@item args
+This option syntax is:
+attack,decay,[attack,decay..] soft-knee points crossover_frequency [delay [initial_volume [gain]]] | attack,decay ...
+For explanation of each item refer to compand filter documentation.
+@end table
+
 @anchor{pan}
 @section pan