avfilter: add avgblur filter

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

Changelog

@@ -26,6 +26,7 @@ version <next>:
 - added threads option per filter instance
 - weave filter
 - gblur filter
+- avgblur filter
 
 
 version 3.1:

doc/filters.texi

@@ -4402,6 +4402,24 @@ number in range [5, 129].
 Set what planes of frame filter will use for averaging. Default is all.
 @end table
 
+@section avgblur
+
+Apply average blur filter.
+
+The filter accepts the following options:
+
+@table @option
+@item sizeX
+Set horizontal kernel size.
+
+@item planes
+Set which planes to filter. By default all planes are filtered.
+
+@item sizeY
+Set vertical kernel size, if zero it will be same as @code{sizeX}.
+Default is @code{0}.
+@end table
+
 @section bbox
 
 Compute the bounding box for the non-black pixels in the input frame

libavfilter/Makefile

@@ -124,6 +124,7 @@ OBJS-$(CONFIG_ALPHAEXTRACT_FILTER)           += vf_extractplanes.o
 OBJS-$(CONFIG_ALPHAMERGE_FILTER)             += vf_alphamerge.o
 OBJS-$(CONFIG_ASS_FILTER)                    += vf_subtitles.o
 OBJS-$(CONFIG_ATADENOISE_FILTER)             += vf_atadenoise.o
+OBJS-$(CONFIG_AVGBLUR_FILTER)                += vf_avgblur.o
 OBJS-$(CONFIG_BBOX_FILTER)                   += bbox.o vf_bbox.o
 OBJS-$(CONFIG_BENCH_FILTER)                  += f_bench.o
 OBJS-$(CONFIG_BITPLANENOISE_FILTER)          += vf_bitplanenoise.o

libavfilter/allfilters.c

@@ -141,6 +141,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(ALPHAMERGE,     alphamerge,     vf);
     REGISTER_FILTER(ASS,            ass,            vf);
     REGISTER_FILTER(ATADENOISE,     atadenoise,     vf);
+    REGISTER_FILTER(AVGBLUR,        avgblur,        vf);
     REGISTER_FILTER(BBOX,           bbox,           vf);
     REGISTER_FILTER(BENCH,          bench,          vf);
     REGISTER_FILTER(BITPLANENOISE,  bitplanenoise,  vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  60
+#define LIBAVFILTER_VERSION_MINOR  61
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \