avfilter: add gblur filter

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

Changelog

@@ -25,6 +25,7 @@ version <next>:
 - vaguedenoiser filter
 - added threads option per filter instance
 - weave filter
+- gblur filter
 
 
 version 3.1:

doc/filters.texi

@@ -8251,6 +8251,23 @@ option may cause flicker since the B-Frames have often larger QP. Default is
 
 @end table
 
+@section gblur
+
+Apply Gaussian blur filter.
+
+The filter accepts the following options:
+
+@table @option
+@item sigma
+Set sigma, standard deviation of Gaussian blur. Default is @code{0.5}.
+
+@item steps
+Set number of steps for Gaussian approximation. Defauls is @code{1}.
+
+@item planes
+Set which planes to filter. By default all planes are filtered.
+@end table
+
 @section geq
 
 The filter accepts the following options:

libavfilter/Makefile

@@ -182,6 +182,7 @@ OBJS-$(CONFIG_FRAMERATE_FILTER)              += vf_framerate.o
 OBJS-$(CONFIG_FRAMESTEP_FILTER)              += vf_framestep.o
 OBJS-$(CONFIG_FREI0R_FILTER)                 += vf_frei0r.o
 OBJS-$(CONFIG_FSPP_FILTER)                   += vf_fspp.o
+OBJS-$(CONFIG_GBLUR_FILTER)                  += vf_gblur.o
 OBJS-$(CONFIG_GEQ_FILTER)                    += vf_geq.o
 OBJS-$(CONFIG_GRADFUN_FILTER)                += vf_gradfun.o
 OBJS-$(CONFIG_HALDCLUT_FILTER)               += vf_lut3d.o dualinput.o framesync.o

libavfilter/allfilters.c

@@ -199,6 +199,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(FRAMESTEP,      framestep,      vf);
     REGISTER_FILTER(FREI0R,         frei0r,         vf);
     REGISTER_FILTER(FSPP,           fspp,           vf);
+    REGISTER_FILTER(GBLUR,          gblur,          vf);
     REGISTER_FILTER(GEQ,            geq,            vf);
     REGISTER_FILTER(GRADFUN,        gradfun,        vf);
     REGISTER_FILTER(HALDCLUT,       haldclut,       vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  59
+#define LIBAVFILTER_VERSION_MINOR  60
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \