avfilter: add afwtdn filter

Changelog

@@ -8,6 +8,7 @@ version <next>:
 - Argonaut Games CVG demuxer
 - Argonaut Games CVG muxer
 - Concatf protocol
+- afwtdn audio filter
 
 
 version 4.4:

doc/filters.texi

@@ -1493,6 +1493,66 @@ Default value is 1.0.
 
 This filter supports the all above options as @ref{commands}.
 
+@section afwtdn
+Reduce broadband noise from input samples using Wavelets.
+
+A description of the accepted options follows.
+
+@table @option
+@item sigma
+Set the noise sigma, allowed range is from 0 to 1.
+Default value is 0.
+This option controls strength of denoising applied to input samples.
+Most useful way to set this option is via decibels, eg. -45dB.
+
+@item levels
+Set the number of wavelet levels of decomposition.
+Allowed range is from 1 to 12.
+Default value is 10.
+Setting this too low make denoising performance very poor.
+
+@item wavet
+Set wavelet type for decomposition of input frame.
+They are sorted by number of coefficients, from lowest to highest.
+More coefficients means worse filtering speed, but overall better quality.
+Available wavelets are:
+
+@table @samp
+@item sym2
+@item sym4
+@item rbior68
+@item deb10
+@item sym10
+@item coif5
+@item bl3
+@end table
+
+@item percent
+Set percent of full denoising. Allowed range is from 0 to 100 percent.
+Default value is 85 percent or partial denoising.
+
+@item profile
+If enabled, first input frame will be used as noise profile.
+If first frame samples contain non-noise performance will be very poor.
+
+@item adaptive
+If enabled, input frames are analyzed for presence of noise.
+If noise is detected with high possibility then input frame profile will be
+used for processing following frames, until new noise frame is detected.
+
+@item samples
+Set size of single frame in number of samples. Allowed range is from 512 to
+65536. Default frame size is 8192 samples.
+
+@item softness
+Set softness applied inside thresholding function. Allowed range is from 0 to
+10. Default softness is 1.
+@end table
+
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
 @section agate
 
 A gate is mainly used to reduce lower parts of a signal. This kind of signal

libavfilter/Makefile

@@ -53,6 +53,7 @@ OBJS-$(CONFIG_AFFTFILT_FILTER)               += af_afftfilt.o
 OBJS-$(CONFIG_AFIR_FILTER)                   += af_afir.o
 OBJS-$(CONFIG_AFORMAT_FILTER)                += af_aformat.o
 OBJS-$(CONFIG_AFREQSHIFT_FILTER)             += af_afreqshift.o
+OBJS-$(CONFIG_AFWTDN_FILTER)                 += af_afwtdn.o
 OBJS-$(CONFIG_AGATE_FILTER)                  += af_agate.o
 OBJS-$(CONFIG_AIIR_FILTER)                   += af_aiir.o
 OBJS-$(CONFIG_AINTEGRAL_FILTER)              += af_aderivative.o

libavfilter/allfilters.c

@@ -46,6 +46,7 @@ extern const AVFilter ff_af_afftfilt;
 extern const AVFilter ff_af_afir;
 extern const AVFilter ff_af_aformat;
 extern const AVFilter ff_af_afreqshift;
+extern const AVFilter ff_af_afwtdn;
 extern const AVFilter ff_af_agate;
 extern const AVFilter ff_af_aiir;
 extern const AVFilter ff_af_aintegral;

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   8
-#define LIBAVFILTER_VERSION_MINOR   0
+#define LIBAVFILTER_VERSION_MINOR   1
 #define LIBAVFILTER_VERSION_MICRO 103