avfilter: add ciescope filter

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

Changelog

@@ -9,6 +9,7 @@ version <next>:
 - firequalizer filter
 - datascope filter
 - bench and abench filters
+- ciescope filter
 
 
 version 3.0:

doc/filters.texi

@@ -4553,6 +4553,61 @@ ffmpeg -f lavfi -i color=c=black:s=1280x720 -i video.mp4 -shortest -filter_compl
 @end example
 @end itemize
 
+@section ciescope
+
+Display CIE color diagram with pixels overlaid onto it.
+
+The filter acccepts the following options:
+
+@table @option
+@item system
+Set color system.
+
+@table @samp
+@item ntsc, 470m
+@item ebu, 470bg
+@item smpte
+@item 240m
+@item apple
+@item widergb
+@item cie1931
+@item rec709, hdtv
+@item uhdtv, rec2020
+@end table
+
+@item cie
+Set CIE system.
+
+@table @samp
+@item xyy
+@item ucs
+@item luv
+@end table
+
+@item gamuts
+Set what gamuts to draw.
+
+See @code{system} option for avaiable values.
+
+@item size, s
+Set ciescope size, by default set to 512.
+
+@item intensity, i
+Set intensity used to map input pixel values to CIE diagram.
+
+@item contrast
+Set contrast used to draw tongue colors that are out of active color system gamut.
+
+@item corrgamma
+Correct gamma displayed on scope, by default enabled.
+
+@item showwhite
+Show white point on CIE diagram, by default disabled.
+
+@item gamma
+Set input gamma. Used only with XYZ input color space.
+@end table
+
 @section codecview
 
 Visualize information exported by some codecs.

libavfilter/Makefile

@@ -124,6 +124,7 @@ OBJS-$(CONFIG_BLEND_FILTER)                  += vf_blend.o dualinput.o framesync
 OBJS-$(CONFIG_BOXBLUR_FILTER)                += vf_boxblur.o
 OBJS-$(CONFIG_BWDIF_FILTER)                  += vf_bwdif.o
 OBJS-$(CONFIG_CHROMAKEY_FILTER)              += vf_chromakey.o
+OBJS-$(CONFIG_CIESCOPE_FILTER)               += vf_ciescope.o
 OBJS-$(CONFIG_CODECVIEW_FILTER)              += vf_codecview.o
 OBJS-$(CONFIG_COLORBALANCE_FILTER)           += vf_colorbalance.o
 OBJS-$(CONFIG_COLORCHANNELMIXER_FILTER)      += vf_colorchannelmixer.o

libavfilter/allfilters.c

@@ -145,6 +145,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(BOXBLUR,        boxblur,        vf);
     REGISTER_FILTER(BWDIF,          bwdif,          vf);
     REGISTER_FILTER(CHROMAKEY,      chromakey,      vf);
+    REGISTER_FILTER(CIESCOPE,       ciescope,       vf);
     REGISTER_FILTER(CODECVIEW,      codecview,      vf);
     REGISTER_FILTER(COLORBALANCE,   colorbalance,   vf);
     REGISTER_FILTER(COLORCHANNELMIXER, colorchannelmixer, vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  38
+#define LIBAVFILTER_VERSION_MINOR  39
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \