avfilter: add xcorrelate video filter

Changelog

@@ -27,6 +27,7 @@ version <next>:
 - asdr audio filter
 - speex decoder
 - limitdiff video filter
+- xcorrelate video filter
 
 
 version 4.4:

doc/filters.texi

@@ -22563,6 +22563,24 @@ Set the scaling dimension: @code{2} for @code{2xBR}, @code{3} for
 Default is @code{3}.
 @end table
 
+@section xcorrelate
+Apply normalized cross-correlation between first and second input video stream.
+
+Second input video stream dimensions must be lower than first input video stream.
+
+The filter accepts the following options:
+
+@table @option
+@item planes
+Set which planes to process.
+
+@item secondary
+Set which secondary video frames will be processed from second input video stream,
+can be @var{first} or @var{all}. Default is @var{all}.
+@end table
+
+The @code{xcorrelate} filter also supports the @ref{framesync} options.
+
 @section xfade
 
 Apply cross fade from one input video stream to another input video stream.

libavfilter/Makefile

@@ -500,6 +500,7 @@ OBJS-$(CONFIG_W3FDIF_FILTER)                 += vf_w3fdif.o
 OBJS-$(CONFIG_WAVEFORM_FILTER)               += vf_waveform.o
 OBJS-$(CONFIG_WEAVE_FILTER)                  += vf_weave.o
 OBJS-$(CONFIG_XBR_FILTER)                    += vf_xbr.o
+OBJS-$(CONFIG_XCORRELATE_FILTER)             += vf_convolve.o framesync.o
 OBJS-$(CONFIG_XFADE_FILTER)                  += vf_xfade.o
 OBJS-$(CONFIG_XFADE_OPENCL_FILTER)           += vf_xfade_opencl.o opencl.o opencl/xfade.o
 OBJS-$(CONFIG_XMEDIAN_FILTER)                += vf_xmedian.o framesync.o

libavfilter/allfilters.c

@@ -477,6 +477,7 @@ extern const AVFilter ff_vf_w3fdif;
 extern const AVFilter ff_vf_waveform;
 extern const AVFilter ff_vf_weave;
 extern const AVFilter ff_vf_xbr;
+extern const AVFilter ff_vf_xcorrelate;
 extern const AVFilter ff_vf_xfade;
 extern const AVFilter ff_vf_xfade_opencl;
 extern const AVFilter ff_vf_xmedian;

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   8
-#define LIBAVFILTER_VERSION_MINOR  13
+#define LIBAVFILTER_VERSION_MINOR  14
 #define LIBAVFILTER_VERSION_MICRO 100