avfilter: add fftdnoiz filter

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

Changelog

@@ -5,6 +5,7 @@ version <next>:
 - deblock filter
 - tmix filter
 - amplify filter
+- fftdnoiz filter
 
 
 version 4.0:

configure

@@ -3325,6 +3325,8 @@ elbg_filter_deps="avcodec"
 eq_filter_deps="gpl"
 fftfilt_filter_deps="avcodec"
 fftfilt_filter_select="rdft"
+fftdnoiz_filter_deps="avcodec"
+fftdnoiz_filter_select="fft"
 find_rect_filter_deps="avcodec avformat gpl"
 firequalizer_filter_deps="avcodec"
 firequalizer_filter_select="rdft"

doc/filters.texi

@@ -8696,6 +8696,40 @@ fftfilt=dc_Y=0:weight_Y='exp(-4 * ((Y+X)/(W+H)))'
 
 @end itemize
 
+@section fftdnoiz
+Denoise frames using 3D FFT (frequency domain filtering).
+
+The filter accepts the following options:
+
+@table @option
+@item sigma
+Set the noise sigma constant. This sets denoising strength.
+Default value is 1. Allowed range is from 0 to 30.
+Using very high sigma with low overlap may give blocking artifacts.
+
+@item amount
+Set amount of denoising. By default all detected noise is reduced.
+Default value is 1. Allowed range is from 0 to 1.
+
+@item block
+Set size of block, Default is 4, can be 3, 4, 5 or 6.
+Actual size of block in pixels is 2 to power of @var{block}, so by default
+block size in pixels is 2^4 which is 16.
+
+@item overlap
+Set block overlap. Default is 0.5. Allowed range is from 0.2 to 0.8.
+
+@item prev
+Set number of previous frames to use for denoising. By default is set to 0.
+
+@item next
+Set number of next frames to to use for denoising. By default is set to 0.
+
+@item planes
+Set planes which will be filtered, by default are all available filtered
+except alpha.
+@end table
+
 @section field
 
 Extract a single field from an interlaced image using stride

libavfilter/Makefile

@@ -201,6 +201,7 @@ OBJS-$(CONFIG_EQ_FILTER)                     += vf_eq.o
 OBJS-$(CONFIG_EROSION_FILTER)                += vf_neighbor.o
 OBJS-$(CONFIG_EXTRACTPLANES_FILTER)          += vf_extractplanes.o
 OBJS-$(CONFIG_FADE_FILTER)                   += vf_fade.o
+OBJS-$(CONFIG_FFTDNOIZ_FILTER)               += vf_fftdnoiz.o
 OBJS-$(CONFIG_FFTFILT_FILTER)                += vf_fftfilt.o
 OBJS-$(CONFIG_FIELD_FILTER)                  += vf_field.o
 OBJS-$(CONFIG_FIELDHINT_FILTER)              += vf_fieldhint.o

libavfilter/allfilters.c

@@ -193,6 +193,7 @@ extern AVFilter ff_vf_eq;
 extern AVFilter ff_vf_erosion;
 extern AVFilter ff_vf_extractplanes;
 extern AVFilter ff_vf_fade;
+extern AVFilter ff_vf_fftdnoiz;
 extern AVFilter ff_vf_fftfilt;
 extern AVFilter ff_vf_field;
 extern AVFilter ff_vf_fieldhint;

libavfilter/version.h

@@ -30,8 +30,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   7
-#define LIBAVFILTER_VERSION_MINOR  21
-#define LIBAVFILTER_VERSION_MICRO 101
+#define LIBAVFILTER_VERSION_MINOR  22
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \