avfilter: add maskedthreshold filter

Changelog

@@ -60,6 +60,7 @@ version <next>:
 - Expanded styling support for 3GPP Timed Text Subtitles (movtext)
 - WebP parser
 - tmedian filter
+- maskedthreshold filter
 
 
 version 4.2:

doc/filters.texi

@@ -13258,6 +13258,27 @@ copied from first stream.
 By default value 0xf, all planes will be processed.
 @end table
 
+@section maskedthreshold
+Pick pixels comparing absolute difference of two video streams with fixed
+threshold.
+
+If absolute difference between pixel component of first and second video
+stream is equal or lower than user supplied threshold than pixel component
+from first video stream is picked, otherwise pixel component from second
+video stream is picked.
+
+This filter accepts the following options:
+@table @option
+@item threshold
+Set threshold used when picking pixels from absolute difference from two input
+video streams.
+
+@item planes
+Set which planes will be processed as bitmap, unprocessed planes will be
+copied from second stream.
+By default value 0xf, all planes will be processed.
+@end table
+
 @section maskfun
 Create mask from input video.
 

libavfilter/Makefile

@@ -302,6 +302,7 @@ OBJS-$(CONFIG_MASKEDCLAMP_FILTER)            += vf_maskedclamp.o framesync.o
 OBJS-$(CONFIG_MASKEDMAX_FILTER)              += vf_maskedminmax.o framesync.o
 OBJS-$(CONFIG_MASKEDMERGE_FILTER)            += vf_maskedmerge.o framesync.o
 OBJS-$(CONFIG_MASKEDMIN_FILTER)              += vf_maskedminmax.o framesync.o
+OBJS-$(CONFIG_MASKEDTHRESHOLD_FILTER)        += vf_maskedthreshold.o framesync.o
 OBJS-$(CONFIG_MASKFUN_FILTER)                += vf_maskfun.o
 OBJS-$(CONFIG_MCDEINT_FILTER)                += vf_mcdeint.o
 OBJS-$(CONFIG_MEDIAN_FILTER)                 += vf_median.o

libavfilter/allfilters.c

@@ -287,6 +287,7 @@ extern AVFilter ff_vf_maskedclamp;
 extern AVFilter ff_vf_maskedmax;
 extern AVFilter ff_vf_maskedmerge;
 extern AVFilter ff_vf_maskedmin;
+extern AVFilter ff_vf_maskedthreshold;
 extern AVFilter ff_vf_maskfun;
 extern AVFilter ff_vf_mcdeint;
 extern AVFilter ff_vf_median;

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   7
-#define LIBAVFILTER_VERSION_MINOR  78
+#define LIBAVFILTER_VERSION_MINOR  79
 #define LIBAVFILTER_VERSION_MICRO 100