avfilter: add pixscope filter

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

doc/filters.texi

@@ -10925,6 +10925,29 @@ format=monow, pixdesctest
 
 can be used to test the monowhite pixel format descriptor definition.
 
+@section pixscope
+
+Display sample values of color channels. Mainly useful for checking color and levels.
+
+The filters accept the following options:
+
+@table @option
+@item x
+Set scope X position, offset on X axis.
+
+@item y
+Set scope Y position, offset on Y axis.
+
+@item w
+Set scope width.
+
+@item h
+Set scope height.
+
+@item o
+Set window opacity. This window also holds statistics about pixel area.
+@end table
+
 @section pp
 
 Enable the specified chain of postprocessing subfilters using libpostproc. This

libavfilter/Makefile

@@ -245,6 +245,7 @@ OBJS-$(CONFIG_PERMS_FILTER)                  += f_perms.o
 OBJS-$(CONFIG_PERSPECTIVE_FILTER)            += vf_perspective.o
 OBJS-$(CONFIG_PHASE_FILTER)                  += vf_phase.o
 OBJS-$(CONFIG_PIXDESCTEST_FILTER)            += vf_pixdesctest.o
+OBJS-$(CONFIG_PIXSCOPE_FILTER)               += vf_datascope.o
 OBJS-$(CONFIG_PP_FILTER)                     += vf_pp.o
 OBJS-$(CONFIG_PP7_FILTER)                    += vf_pp7.o
 OBJS-$(CONFIG_PREMULTIPLY_FILTER)            += vf_premultiply.o framesync.o

libavfilter/allfilters.c

@@ -255,6 +255,7 @@ static void register_all(void)
     REGISTER_FILTER(PERSPECTIVE,    perspective,    vf);
     REGISTER_FILTER(PHASE,          phase,          vf);
     REGISTER_FILTER(PIXDESCTEST,    pixdesctest,    vf);
+    REGISTER_FILTER(PIXSCOPE,       pixscope,       vf);
     REGISTER_FILTER(PP,             pp,             vf);
     REGISTER_FILTER(PP7,            pp7,            vf);
     REGISTER_FILTER(PREMULTIPLY,    premultiply,    vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  87
+#define LIBAVFILTER_VERSION_MINOR  88
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \