avfilter: add varblur video filter

Changelog

@@ -28,6 +28,7 @@ version <next>:
 - speex decoder
 - limitdiff video filter
 - xcorrelate video filter
+- varblur video filter
 
 
 version 4.4:

doc/filters.texi

@@ -21704,6 +21704,22 @@ Threshold used depends also on each decomposition coefficients.
 Default is universal.
 @end table
 
+@section varblur
+Apply variable blur filter by using 2nd video stream to set blur radius.
+
+This filter accepts the following options:
+
+@table @option
+@item min_r
+Set min allowed radius. By default is 0. Allowed range is from 0 to 254.
+@item max_r
+Set max allowed radius. By default is 8. Allowed range is from 1 to 255.
+@item planes
+Set which planes to process. By default all are used.
+@end table
+
+The @code{varblur} filter also supports the @ref{framesync} options.
+
 @section vectorscope
 
 Display 2 color component values in the two dimensional graph (which is called

libavfilter/Makefile

@@ -485,6 +485,7 @@ OBJS-$(CONFIG_UNTILE_FILTER)                 += vf_untile.o
 OBJS-$(CONFIG_USPP_FILTER)                   += vf_uspp.o qp_table.o
 OBJS-$(CONFIG_V360_FILTER)                   += vf_v360.o
 OBJS-$(CONFIG_VAGUEDENOISER_FILTER)          += vf_vaguedenoiser.o
+OBJS-$(CONFIG_VARBLUR_FILTER)                += vf_varblur.o framesync.o
 OBJS-$(CONFIG_VECTORSCOPE_FILTER)            += vf_vectorscope.o
 OBJS-$(CONFIG_VFLIP_FILTER)                  += vf_vflip.o
 OBJS-$(CONFIG_VFRDET_FILTER)                 += vf_vfrdet.o

libavfilter/allfilters.c

@@ -462,6 +462,7 @@ extern const AVFilter ff_vf_untile;
 extern const AVFilter ff_vf_uspp;
 extern const AVFilter ff_vf_v360;
 extern const AVFilter ff_vf_vaguedenoiser;
+extern const AVFilter ff_vf_varblur;
 extern const AVFilter ff_vf_vectorscope;
 extern const AVFilter ff_vf_vflip;
 extern const AVFilter ff_vf_vfrdet;

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   8
-#define LIBAVFILTER_VERSION_MINOR  14
+#define LIBAVFILTER_VERSION_MINOR  15
 #define LIBAVFILTER_VERSION_MICRO 100