avfilter: add Contrast Adaptive Sharpen video filter

Changelog

@@ -42,6 +42,7 @@ version <next>:
 - siren audio decoder
 - Rayman 2 ADPCM decoder
 - Rayman 2 APM demuxer
+- cas video filter
 
 
 version 4.2:

doc/filters.texi

@@ -6996,6 +6996,21 @@ Only deinterlace frames marked as interlaced.
 The default value is @code{all}.
 @end table
 
+@section cas
+
+Apply Contrast Adaptive Sharpen filter to video stream.
+
+The filter accepts the following options:
+
+@table @option
+@item strength
+Set the sharpening strength. Default value is 0.
+
+@item planes
+Set planes to filter. Default value is to filter all
+planes except alpha plane.
+@end table
+
 @section chromahold
 Remove all color information for all colors except for certain one.
 

libavfilter/Makefile

@@ -177,6 +177,7 @@ OBJS-$(CONFIG_BOXBLUR_FILTER)                += vf_boxblur.o boxblur.o
 OBJS-$(CONFIG_BOXBLUR_OPENCL_FILTER)         += vf_avgblur_opencl.o opencl.o \
                                                 opencl/avgblur.o boxblur.o
 OBJS-$(CONFIG_BWDIF_FILTER)                  += vf_bwdif.o yadif_common.o
+OBJS-$(CONFIG_CAS_FILTER)                    += vf_cas.o
 OBJS-$(CONFIG_CHROMABER_VULKAN_FILTER)       += vf_chromaber_vulkan.o vulkan.o
 OBJS-$(CONFIG_CHROMAHOLD_FILTER)             += vf_chromakey.o
 OBJS-$(CONFIG_CHROMAKEY_FILTER)              += vf_chromakey.o

libavfilter/allfilters.c

@@ -168,6 +168,7 @@ extern AVFilter ff_vf_bm3d;
 extern AVFilter ff_vf_boxblur;
 extern AVFilter ff_vf_boxblur_opencl;
 extern AVFilter ff_vf_bwdif;
+extern AVFilter ff_vf_cas;
 extern AVFilter ff_vf_chromahold;
 extern AVFilter ff_vf_chromakey;
 extern AVFilter ff_vf_chromashift;

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   7
-#define LIBAVFILTER_VERSION_MINOR  76
+#define LIBAVFILTER_VERSION_MINOR  77
 #define LIBAVFILTER_VERSION_MICRO 100