lavfi: add kerndeint filter

This is a port of the kerndeint filter (libmpcodecs/vf_kerndeint) by
Donal A. Graft (original avisynth plugin author), and is based on the
work by Jérémy Tran <tran.jeremy.av@gmail.com> done for SOCIS 2012.

Changelog

@@ -55,6 +55,7 @@ version <next>:
 - adobe and limelight publisher authentication in RTMP
 - data: URI scheme
 - support building on the Plan 9 operating system
+- kerndeint filter ported from MPlayer
 
 
 version 1.0:

LICENSE

@@ -33,6 +33,7 @@ Specifically, the GPL parts of FFmpeg are
     - vf_geq.c
     - vf_hqdn3d.c
     - vf_hue.c
+    - vf_kerndeint.c
     - vf_mp.c
     - vf_pp.c
     - vf_smartblur.c

configure

@@ -1987,6 +1987,7 @@ frei0r_src_filter_extralibs='$ldl'
 geq_filter_deps="gpl"
 hqdn3d_filter_deps="gpl"
 hue_filter_deps="gpl"
+kerndeint_filter_deps="gpl"
 movie_filter_deps="avcodec avformat"
 mp_filter_deps="gpl avcodec swscale inline_asm"
 mptestsrc_filter_deps="gpl"

doc/filters.texi

@@ -2810,6 +2810,63 @@ If a parameter is omitted, it is kept at its current value.
 Interlaceing detect filter. This filter tries to detect if the input is
 interlaced or progressive. Top or bottom field first.
 
+@section kerndeint
+
+Deinterlace input video by applying Donald Graft's adaptive kernel
+deinterling. Work on interlaced parts of a video to produce
+progressive frames.
+
+This filter accepts parameters as a list of @var{key}=@var{value}
+pairs, separated by ":". If the key of the first options is omitted,
+the arguments are interpreted according to the following syntax:
+@var{thresh}:@var{map}:@var{order}:@var{sharp}:@var{twoway}.
+
+The description of the accepted parameters follows.
+
+@table @option
+@item thresh
+Set the threshold which affects the filter's tolerance when
+determining if a pixel line must be processed. It must be an integer
+in the range [0,255] and defaults to 10. A value of 0 will result in
+applying the process on every pixels.
+
+@item map
+Paint pixels exceeding the threshold value to white if set to 1.
+Default is 0.
+
+@item order
+Set the fields order. Swap fields if set to 1, leave fields alone if
+0. Default is 0.
+
+@item sharp
+Enable additional sharpening if set to 1. Default is 0.
+
+@item twoway
+Enable twoway sharpening if set to 1. Default is 0.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Apply default values:
+@example
+kerndeint=thresh=10:map=0:order=0:sharp=0:twoway=0
+@end example
+
+@item
+Enable additional sharpening:
+@example
+kerndeint=sharp=1
+@end example
+
+@item
+Paint processed pixels in white:
+@example
+kerndeint=map=1
+@end example
+@end itemize
+
 @section lut, lutrgb, lutyuv
 
 Compute a look-up table for binding each pixel component input value

libavfilter/Makefile

@@ -114,6 +114,7 @@ OBJS-$(CONFIG_HFLIP_FILTER)                  += vf_hflip.o
 OBJS-$(CONFIG_HQDN3D_FILTER)                 += vf_hqdn3d.o
 OBJS-$(CONFIG_HUE_FILTER)                    += vf_hue.o
 OBJS-$(CONFIG_IDET_FILTER)                   += vf_idet.o
+OBJS-$(CONFIG_KERNDEINT_FILTER)              += vf_kerndeint.o
 OBJS-$(CONFIG_LUT_FILTER)                    += vf_lut.o
 OBJS-$(CONFIG_LUTRGB_FILTER)                 += vf_lut.o
 OBJS-$(CONFIG_LUTYUV_FILTER)                 += vf_lut.o

libavfilter/allfilters.c

@@ -108,6 +108,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(HQDN3D,         hqdn3d,         vf);
     REGISTER_FILTER(HUE,            hue,            vf);
     REGISTER_FILTER(IDET,           idet,           vf);
+    REGISTER_FILTER(KERNDEINT,      kerndeint,      vf);
     REGISTER_FILTER(LUT,            lut,            vf);
     REGISTER_FILTER(LUTRGB,         lutrgb,         vf);
     REGISTER_FILTER(LUTYUV,         lutyuv,         vf);

libavfilter/version.h

@@ -29,8 +29,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  30
-#define LIBAVFILTER_VERSION_MICRO 104
+#define LIBAVFILTER_VERSION_MINOR  31
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \

tests/fate/avfilter.mak

@@ -11,6 +11,7 @@ FATE_LAVFI = fate-lavfi-alphaextract_rgb                                \
              fate-lavfi-fade                                            \
              fate-lavfi-field                                           \
              fate-lavfi-idet                                            \
+             fate-lavfi-kerndeint                                       \
              fate-lavfi-life                                            \
              fate-lavfi-null                                            \
              fate-lavfi-overlay                                         \

tests/lavfi-regression.sh

@@ -80,6 +80,7 @@ do_lavfi_pixfmts(){
     test ${test%_[bl]e} = $testname || return 0
     filter=$2
     filter_args=$3
+    prefilter_chain=$4
 
     showfiltfmts="$target_exec $target_path/libavfilter/filtfmts-test"
     scale_exclude_fmts=${outfile}${testname}_scale_exclude_fmts
@@ -96,7 +97,7 @@ do_lavfi_pixfmts(){
     pix_fmts=$(comm -12 $scale_exclude_fmts $in_fmts)
 
     for pix_fmt in $pix_fmts; do
-        do_video_filter $pix_fmt "format=$pix_fmt,$filter=$filter_args" -pix_fmt $pix_fmt
+        do_video_filter $pix_fmt "${prefilter_chain}format=$pix_fmt,$filter=$filter_args" -pix_fmt $pix_fmt
     done
 
     rm $in_fmts $scale_in_fmts $scale_out_fmts $scale_exclude_fmts
@@ -104,6 +105,7 @@ do_lavfi_pixfmts(){
 
 # all these filters have exactly one input and exactly one output
 do_lavfi_pixfmts "field"               "field"   "bottom"
+do_lavfi_pixfmts "kerndeint"           "kerndeint" "" "tinterlace=interleave_top,"
 do_lavfi_pixfmts "pixfmts_copy"        "copy"    ""
 do_lavfi_pixfmts "pixfmts_crop"        "crop"    "100:100:100:100"
 do_lavfi_pixfmts "pixfmts_hflip"       "hflip"   ""

tests/ref/lavfi/kerndeint

+argb                484893f83e13c937328f13a7c84d2f50
+yuv420p             a935cce07c5287b92c6d5220361866ed
+yuyv422             f549c98059ba9ce50e28204256d13b5d