avfilter: add fillborders filter

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

Changelog

@@ -23,6 +23,7 @@ version <next>:
 - audio lv2 wrapper filter
 - VAAPI VP8 decoding
 - AMD AMF H.264 and HEVC encoders
+- video fillborders filter
 
 
 version 3.4:

doc/filters.texi

@@ -8610,6 +8610,48 @@ framework.
 
 It does not take parameters.
 
+@section fillborders
+
+Fill borders of the input video, without changing video stream dimensions.
+Sometimes video can have garbage at the four edges and you may not want to
+crop video input to keep size multiple of some number.
+
+This filter accepts the following options:
+
+@table @option
+@item left
+Number of pixels to fill from left border.
+
+@item right
+Number of pixels to fill from right border.
+
+@item top
+Number of pixels to fill from top border.
+
+@item bottom
+Number of pixels to fill from bottom border.
+
+@item mode
+Set fill mode.
+
+It accepts the following values:
+@table @samp
+@item smear
+fill pixels using outermost pixels
+
+@item mirror
+fill pixels using mirroring
+
+@item fixed
+fill pixels with constant value
+@end table
+
+Default is @var{smear}.
+
+@item color
+Set color for pixels in fixed mode. Default is @var{black}.
+@end table
+
 @section find_rect
 
 Find a rectangular object

libavfilter/Makefile

@@ -192,6 +192,7 @@ OBJS-$(CONFIG_FIELD_FILTER)                  += vf_field.o
 OBJS-$(CONFIG_FIELDHINT_FILTER)              += vf_fieldhint.o
 OBJS-$(CONFIG_FIELDMATCH_FILTER)             += vf_fieldmatch.o
 OBJS-$(CONFIG_FIELDORDER_FILTER)             += vf_fieldorder.o
+OBJS-$(CONFIG_FILLBORDERS_FILTER)            += vf_fillborders.o
 OBJS-$(CONFIG_FIND_RECT_FILTER)              += vf_find_rect.o lavfutils.o
 OBJS-$(CONFIG_FLOODFILL_FILTER)              += vf_floodfill.o
 OBJS-$(CONFIG_FORMAT_FILTER)                 += vf_format.o

libavfilter/allfilters.c

@@ -202,6 +202,7 @@ static void register_all(void)
     REGISTER_FILTER(FIELDHINT,      fieldhint,      vf);
     REGISTER_FILTER(FIELDMATCH,     fieldmatch,     vf);
     REGISTER_FILTER(FIELDORDER,     fieldorder,     vf);
+    REGISTER_FILTER(FILLBORDERS,    fillborders,    vf);
     REGISTER_FILTER(FIND_RECT,      find_rect,      vf);
     REGISTER_FILTER(FLOODFILL,      floodfill,      vf);
     REGISTER_FILTER(FORMAT,         format,         vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   7
-#define LIBAVFILTER_VERSION_MINOR   5
+#define LIBAVFILTER_VERSION_MINOR   6
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \