avfilter: add maskedclamp filter

Changelog

@@ -18,6 +18,7 @@ version <next>:
 - bitplanenoise video filter
 - floating point support in als decoder
 - fifo muxer
+- maskedclamp filter
 
 
 version 3.1:

doc/filters.texi

@@ -9234,6 +9234,27 @@ lutyuv=u='(val-maxval/2)*2+maxval/2':v='(val-maxval/2)*2+maxval/2'
 @end example
 @end itemize
 
+@section maskedclamp
+
+Clamp the first input stream with the second input and third input stream.
+
+Returns the value of first stream to be between second input
+stream - @code{undershoot} and third input stream + @code{overshoot}.
+
+This filter accepts the following options:
+@table @option
+@item undershoot
+Default value is @code{0}.
+
+@item overshoot
+Default value is @code{0}.
+
+@item planes
+Set which planes will be processed as bitmap, unprocessed planes will be
+copied from first stream.
+By default value 0xf, all planes will be processed.
+@end table
+
 @section maskedmerge
 
 Merge the first input stream with the second input stream using per pixel

libavfilter/Makefile

@@ -207,6 +207,7 @@ OBJS-$(CONFIG_LUT_FILTER)                    += vf_lut.o
 OBJS-$(CONFIG_LUT3D_FILTER)                  += vf_lut3d.o
 OBJS-$(CONFIG_LUTRGB_FILTER)                 += vf_lut.o
 OBJS-$(CONFIG_LUTYUV_FILTER)                 += vf_lut.o
+OBJS-$(CONFIG_MASKEDCLAMP_FILTER)            += vf_maskedclamp.o framesync.o
 OBJS-$(CONFIG_MASKEDMERGE_FILTER)            += vf_maskedmerge.o framesync.o
 OBJS-$(CONFIG_MCDEINT_FILTER)                += vf_mcdeint.o
 OBJS-$(CONFIG_MERGEPLANES_FILTER)            += vf_mergeplanes.o framesync.o

libavfilter/allfilters.c

@@ -224,6 +224,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(LUT3D,          lut3d,          vf);
     REGISTER_FILTER(LUTRGB,         lutrgb,         vf);
     REGISTER_FILTER(LUTYUV,         lutyuv,         vf);
+    REGISTER_FILTER(MASKEDCLAMP,    maskedclamp,    vf);
     REGISTER_FILTER(MASKEDMERGE,    maskedmerge,    vf);
     REGISTER_FILTER(MCDEINT,        mcdeint,        vf);
     REGISTER_FILTER(MERGEPLANES,    mergeplanes,    vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  52
+#define LIBAVFILTER_VERSION_MINOR  53
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \