avfilter: add generic FFT video convolve filter

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

Changelog

@@ -45,6 +45,7 @@ version <next>:
 - despill video filter
 - haas audio filter
 - SUP/PGS subtitle muxer
+- convolve video filter
 
 version 3.3:
 - CrystalHD decoder moved to new decode API

doc/filters.texi

@@ -6005,6 +6005,24 @@ convolution="-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -
 @end example
 @end itemize
 
+@section convolve
+
+Apply 2D convolution of video stream in frequency domain using second stream
+as impulse.
+
+The filter accepts the following options:
+
+@table @option
+@item planes
+Set which planes to process.
+
+@item impulse
+Set which impulse video frames will be processed, can be @var{first}
+or @var{all}. Default is @var{all}.
+@end table
+
+The @code{convolve} filter also supports the @ref{framesync} options.
+
 @section copy
 
 Copy the input video source unchanged to the output. This is mainly useful for

libavfilter/Makefile

@@ -150,6 +150,7 @@ OBJS-$(CONFIG_COLORLEVELS_FILTER)            += vf_colorlevels.o
 OBJS-$(CONFIG_COLORMATRIX_FILTER)            += vf_colormatrix.o
 OBJS-$(CONFIG_COLORSPACE_FILTER)             += vf_colorspace.o colorspacedsp.o
 OBJS-$(CONFIG_CONVOLUTION_FILTER)            += vf_convolution.o
+OBJS-$(CONFIG_CONVOLVE_FILTER)               += vf_convolve.o framesync2.o
 OBJS-$(CONFIG_COPY_FILTER)                   += vf_copy.o
 OBJS-$(CONFIG_COREIMAGE_FILTER)              += vf_coreimage.o
 OBJS-$(CONFIG_COVER_RECT_FILTER)             += vf_cover_rect.o lavfutils.o

libavfilter/allfilters.c

@@ -162,6 +162,7 @@ static void register_all(void)
     REGISTER_FILTER(COLORMATRIX,    colormatrix,    vf);
     REGISTER_FILTER(COLORSPACE,     colorspace,     vf);
     REGISTER_FILTER(CONVOLUTION,    convolution,    vf);
+    REGISTER_FILTER(CONVOLVE,       convolve,       vf);
     REGISTER_FILTER(COPY,           copy,           vf);
     REGISTER_FILTER(COREIMAGE,      coreimage,      vf);
     REGISTER_FILTER(COVER_RECT,     cover_rect,     vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR 104
+#define LIBAVFILTER_VERSION_MINOR 105
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \