libavfilter: add photosensitivity filter

Changelog

@@ -13,6 +13,7 @@ version <next>:
 - streamhash muxer
 - sierpinski video source
 - scroll video filter
+- photosensitivity filter
 
 
 version 4.2:

doc/filters.texi

@@ -14040,6 +14040,26 @@ Filter selects among @samp{t}, @samp{b} and @samp{p} using image analysis only.
 @end table
 @end table
 
+@section photosensitivity
+Reduce various flashes in video, so to help users with epilepsy.
+
+It accepts the following options:
+@table @option
+@item frames, f
+Set how many frames to use when filtering. Default is 30.
+
+@item threshold, t
+Set detection threshold factor. Default is 1.
+Lower is stricter.
+
+@item skip
+Set how many pixels to skip when sampling frames. Defalt is 1.
+Allowed range is from 1 to 1024.
+
+@item bypass
+Leave frames unchanged. Default is disabled.
+@end table
+
 @section pixdesctest
 
 Pixel format descriptor test filter, mainly useful for internal

libavfilter/Makefile

@@ -321,6 +321,7 @@ OBJS-$(CONFIG_PALETTEUSE_FILTER)             += vf_paletteuse.o framesync.o
 OBJS-$(CONFIG_PERMS_FILTER)                  += f_perms.o
 OBJS-$(CONFIG_PERSPECTIVE_FILTER)            += vf_perspective.o
 OBJS-$(CONFIG_PHASE_FILTER)                  += vf_phase.o
+OBJS-$(CONFIG_PHOTOSENSITIVITY_FILTER)       += vf_photosensitivity.o
 OBJS-$(CONFIG_PIXDESCTEST_FILTER)            += vf_pixdesctest.o
 OBJS-$(CONFIG_PIXSCOPE_FILTER)               += vf_datascope.o
 OBJS-$(CONFIG_PP_FILTER)                     += vf_pp.o

libavfilter/allfilters.c

@@ -305,6 +305,7 @@ extern AVFilter ff_vf_paletteuse;
 extern AVFilter ff_vf_perms;
 extern AVFilter ff_vf_perspective;
 extern AVFilter ff_vf_phase;
+extern AVFilter ff_vf_photosensitivity;
 extern AVFilter ff_vf_pixdesctest;
 extern AVFilter ff_vf_pixscope;
 extern AVFilter ff_vf_pp;

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   7
-#define LIBAVFILTER_VERSION_MINOR  60
+#define LIBAVFILTER_VERSION_MINOR  61
 #define LIBAVFILTER_VERSION_MICRO 100