From c7d8082357965bfd02bc3a8ba6867b36119d2895 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Wed, 22 Apr 2020 15:29:16 +0200
Subject: avfilter: add asubboost filter

---
 doc/filters.texi | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'doc')

diff --git a/doc/filters.texi b/doc/filters.texi
index f8dc02f00d..be224bd5b9 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2454,6 +2454,45 @@ Number of points where the waveform crosses the zero level axis.
 Rate of Zero crossings and number of audio samples.
 @end table
 
+@section asubboost
+Boost subwoofer frequencies.
+
+The filter accepts the following options:
+
+@table @option
+@item dry
+Set dry gain, how much of original signal is kept. Allowed range is from 0 to 1.
+Default value is 0.5.
+
+@item wet
+Set wet gain, how much of filtered signal is kept. Allowed range is from 0 to 1.
+Default value is 0.8.
+
+@item decay
+Set delay line decay gain value. Allowed range is from 0 to 1.
+Default value is 0.7.
+
+@item feedback
+Set delay line feedback gain value. Allowed range is from 0 to 1.
+Default value is 0.5.
+
+@item cutoff
+Set cutoff frequency in herz. Allowed range is 50 to 900.
+Default value is 100.
+
+@item slope
+Set slope amount for cutoff frequency. Allowed range is 0.0001 to 1.
+Default value is 0.5.
+
+@item delay
+Set delay. Allowed range is from 1 to 100.
+Default value is 20.
+@end table
+
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
 @section atempo
 
 Adjust audio tempo.
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