avfilter: add chromashift filter

doc/filters.texi

@@ -6253,6 +6253,23 @@ ffmpeg -f lavfi -i color=c=black:s=1280x720 -i video.mp4 -shortest -filter_compl
 @end example
 @end itemize
 
+@section chromashift
+Shift chroma pixels horizontally and/or vertically.
+
+The filter accepts the following options:
+@table @option
+@item cbh
+Set amount to shift chroma-blue horizontally.
+@item cbv
+Set amount to shift chroma-blue vertically.
+@item crh
+Set amount to shift chroma-red horizontally.
+@item crv
+Set amount to shift chroma-red vertically.
+@item edge
+Set edge mode, can be @var{smear}, default, or @var{warp}.
+@end table
+
 @section ciescope
 
 Display CIE color diagram with pixels overlaid onto it.

libavfilter/Makefile

@@ -169,6 +169,7 @@ OBJS-$(CONFIG_BOXBLUR_OPENCL_FILTER)         += vf_avgblur_opencl.o opencl.o \
 OBJS-$(CONFIG_BWDIF_FILTER)                  += vf_bwdif.o
 OBJS-$(CONFIG_CHROMAHOLD_FILTER)             += vf_chromakey.o
 OBJS-$(CONFIG_CHROMAKEY_FILTER)              += vf_chromakey.o
+OBJS-$(CONFIG_CHROMASHIFT_FILTER)            += vf_chromashift.o
 OBJS-$(CONFIG_CIESCOPE_FILTER)               += vf_ciescope.o
 OBJS-$(CONFIG_CODECVIEW_FILTER)              += vf_codecview.o
 OBJS-$(CONFIG_COLORBALANCE_FILTER)           += vf_colorbalance.o

libavfilter/allfilters.c

@@ -158,6 +158,7 @@ extern AVFilter ff_vf_boxblur_opencl;
 extern AVFilter ff_vf_bwdif;
 extern AVFilter ff_vf_chromahold;
 extern AVFilter ff_vf_chromakey;
+extern AVFilter ff_vf_chromashift;
 extern AVFilter ff_vf_ciescope;
 extern AVFilter ff_vf_codecview;
 extern AVFilter ff_vf_colorbalance;