lavfi: port sab filter from libmpcodecs

LICENSE

@@ -40,6 +40,7 @@ Specifically, the GPL parts of FFmpeg are
     - vf_noise.c
     - vf_owdenoise.c
     - vf_pp.c
+    - vf_sab.c
     - vf_smartblur.c
     - vf_stereo3d.c
     - vf_super2xsai.c

configure

@@ -2168,6 +2168,7 @@ owdenoise_filter_deps="gpl"
 pan_filter_deps="swresample"
 pp_filter_deps="gpl postproc"
 removelogo_filter_deps="avcodec avformat swscale"
+sab_filter_deps="gpl swscale"
 scale_filter_deps="swscale"
 smartblur_filter_deps="gpl swscale"
 showspectrum_filter_deps="avcodec rdft"

doc/filters.texi

@@ -5772,6 +5772,42 @@ much, but it will increase the amount of blurring needed to cover over
 the image and will destroy more information than necessary, and extra
 pixels will slow things down on a large logo.
 
+@section sab
+
+Apply Shape Adaptive Blur.
+
+The filter accepts the following options:
+
+@table @option
+@item luma_radius, lr
+Set luma blur filter strength, must be a value in range 0.1-4.0, default
+value is 1.0. A greater value will result in a more blurred image, and
+in slower processing.
+
+@item luma_pre_filter_radius, lpfr
+Set luma pre-filter radius, must be a value in the 0.1-2.0 range, default
+value is 1.0.
+
+@item luma_strength, ls
+Set luma maximum difference between pixels to still be considered, must
+be a value in the 0.1-100.0 range, default value is 1.0.
+
+@item chroma_radius, cr
+Set chroma blur filter strength, must be a value in range 0.1-4.0. A
+greater value will result in a more blurred image, and in slower
+processing.
+
+@item chroma_pre_filter_radius, cpfr
+Set chroma pre-filter radius, must be a value in the 0.1-2.0 range.
+
+@item chroma_strength, cs
+Set chroma maximum difference between pixels to still be considered,
+must be a value in the 0.1-100.0 range.
+@end table
+
+Each chroma option value, if not explicitly specified, is set to the
+corresponding luma option value.
+
 @section scale
 
 Scale (resize) the input video, using the libswscale library.

libavfilter/Makefile

@@ -16,6 +16,7 @@ FFLIBS-$(CONFIG_PAN_FILTER)                  += swresample
 FFLIBS-$(CONFIG_PP_FILTER)                   += postproc
 FFLIBS-$(CONFIG_REMOVELOGO_FILTER)           += avformat avcodec swscale
 FFLIBS-$(CONFIG_RESAMPLE_FILTER)             += avresample
+FFLIBS-$(CONFIG_SAB_FILTER)                  += swscale
 FFLIBS-$(CONFIG_SCALE_FILTER)                += swscale
 FFLIBS-$(CONFIG_SHOWSPECTRUM_FILTER)         += avcodec
 FFLIBS-$(CONFIG_SMARTBLUR_FILTER)            += swscale
@@ -168,6 +169,7 @@ OBJS-$(CONFIG_PIXDESCTEST_FILTER)            += vf_pixdesctest.o
 OBJS-$(CONFIG_PP_FILTER)                     += vf_pp.o
 OBJS-$(CONFIG_REMOVELOGO_FILTER)             += bbox.o lswsutils.o lavfutils.o vf_removelogo.o
 OBJS-$(CONFIG_SEPARATEFIELDS_FILTER)         += vf_separatefields.o
+OBJS-$(CONFIG_SAB_FILTER)                    += vf_sab.o
 OBJS-$(CONFIG_SCALE_FILTER)                  += vf_scale.o
 OBJS-$(CONFIG_SELECT_FILTER)                 += f_select.o
 OBJS-$(CONFIG_SENDCMD_FILTER)                += f_sendcmd.o

libavfilter/allfilters.c

@@ -163,6 +163,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(PIXDESCTEST,    pixdesctest,    vf);
     REGISTER_FILTER(PP,             pp,             vf);
     REGISTER_FILTER(REMOVELOGO,     removelogo,     vf);
+    REGISTER_FILTER(SAB,            sab,            vf);
     REGISTER_FILTER(SCALE,          scale,          vf);
     REGISTER_FILTER(SELECT,         select,         vf);
     REGISTER_FILTER(SENDCMD,        sendcmd,        vf);

libavfilter/version.h

@@ -30,8 +30,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  74
-#define LIBAVFILTER_VERSION_MICRO 101
+#define LIBAVFILTER_VERSION_MINOR  75
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \