lavfi: Weston 3 Field Deinterlacing Filter

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

Changelog

@@ -17,6 +17,7 @@ version <next>
 - read EXIF metadata from JPEG
 - DVB teletext decoder
 - phase filter ported from libmpcodecs
+- w3fdif filter
 
 
 version 2.0:

doc/filters.texi

@@ -7830,6 +7830,45 @@ vignette='PI/4+random(1)*PI/50':eval=frame
 
 @end itemize
 
+@section w3fdif
+
+Deinterlace the input video ("w3fdif" stands for "Weston 3 Field
+Deinterlacing Filter").
+
+Based on the process described by Martin Weston for BBC R&D, and
+implemented based on the de-interlace algorithm written by Jim
+Easterbrook for BBC R&D, the Weston 3 field deinterlacing filter
+uses filter coefficients calculated by BBC R&D.
+
+There are two sets of filter coefficients, so called "simple":
+and "complex". Which set of filter coefficients is used can
+be set by passing an optional parameter:
+
+@table @option
+@item filter
+Set the interlacing filter coefficients. Accepts one of the following values:
+
+@table @samp
+@item simple
+Simple filter coefficient set.
+@item complex
+More-complex filter coefficient set.
+@end table
+Default value is @samp{complex}.
+
+@item deint
+Specify which frames to deinterlace. Accept one of the following values:
+
+@table @samp
+@item all
+Deinterlace all frames,
+@item interlaced
+Only deinterlace frames marked as interlaced.
+@end table
+
+Default value is @samp{all}.
+@end table
+
 @anchor{yadif}
 @section yadif
 

libavfilter/Makefile

@@ -203,6 +203,7 @@ OBJS-$(CONFIG_VFLIP_FILTER)                  += vf_vflip.o
 OBJS-$(CONFIG_VIDSTABDETECT_FILTER)          += vidstabutils.o vf_vidstabdetect.o
 OBJS-$(CONFIG_VIDSTABTRANSFORM_FILTER)       += vidstabutils.o vf_vidstabtransform.o
 OBJS-$(CONFIG_VIGNETTE_FILTER)               += vf_vignette.o
+OBJS-$(CONFIG_W3FDIF_FILTER)                 += vf_w3fdif.o
 OBJS-$(CONFIG_YADIF_FILTER)                  += vf_yadif.o
 OBJS-$(CONFIG_ZMQ_FILTER)                    += f_zmq.o
 

libavfilter/allfilters.c

@@ -198,6 +198,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(VIDSTABDETECT,  vidstabdetect,  vf);
     REGISTER_FILTER(VIDSTABTRANSFORM, vidstabtransform, vf);
     REGISTER_FILTER(VIGNETTE,       vignette,       vf);
+    REGISTER_FILTER(W3FDIF,         w3fdif,         vf);
     REGISTER_FILTER(YADIF,          yadif,          vf);
     REGISTER_FILTER(ZMQ,            zmq,            vf);
 

libavfilter/version.h

@@ -30,8 +30,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  83
-#define LIBAVFILTER_VERSION_MICRO 104
+#define LIBAVFILTER_VERSION_MINOR  84
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \