lavfi: USPP Filter

Previous version reviewed by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -2622,6 +2622,7 @@ vidstabtransform_filter_deps="libvidstab"
 pixfmts_super2xsai_test_deps="super2xsai_filter"
 tinterlace_merge_test_deps="tinterlace_filter"
 tinterlace_pad_test_deps="tinterlace_filter"
+uspp_filter_deps="gpl avcodec"
 zmq_filter_deps="libzmq"
 zoompan_filter_deps="swscale"
 

doc/filters.texi

@@ -8935,6 +8935,31 @@ unsharp=7:7:-2:7:7:-2
 @end example
 @end itemize
 
+@section uspp
+
+Apply ultra slow/simple postprocessing filter that compresses and decompresses
+the image at several (or - in the case of @option{quality} level @code{8} - all)
+shifts and average the results.
+
+The way this differs from the behavior of spp is that uspp actually encodes &
+decodes each case with libavcodec Snow, whereas spp uses a simplified intra only 8x8
+DCT similar to MJPEG.
+
+The filter accepts the following options:
+
+@table @option
+@item quality
+Set quality. This option defines the number of levels for averaging. It accepts
+an integer in the range 0-8. If set to @code{0}, the filter will have no
+effect. A value of @code{8} means the higher quality. For each increment of
+that value the speed drops by a factor of approximately 2.  Default value is
+@code{3}.
+
+@item qp
+Force a constant quantization parameter. If not set, the filter will use the QP
+from the video stream (if available).
+@end table
+
 @anchor{vidstabdetect}
 @section vidstabdetect
 

libavfilter/Makefile

@@ -193,6 +193,7 @@ OBJS-$(CONFIG_TINTERLACE_FILTER)             += vf_tinterlace.o
 OBJS-$(CONFIG_TRANSPOSE_FILTER)              += vf_transpose.o
 OBJS-$(CONFIG_TRIM_FILTER)                   += trim.o
 OBJS-$(CONFIG_UNSHARP_FILTER)                += vf_unsharp.o
+OBJS-$(CONFIG_USPP_FILTER)                   += vf_uspp.o
 OBJS-$(CONFIG_VFLIP_FILTER)                  += vf_vflip.o
 OBJS-$(CONFIG_VIDSTABDETECT_FILTER)          += vidstabutils.o vf_vidstabdetect.o
 OBJS-$(CONFIG_VIDSTABTRANSFORM_FILTER)       += vidstabutils.o vf_vidstabtransform.o

libavfilter/allfilters.c

@@ -208,6 +208,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(TRANSPOSE,      transpose,      vf);
     REGISTER_FILTER(TRIM,           trim,           vf);
     REGISTER_FILTER(UNSHARP,        unsharp,        vf);
+    REGISTER_FILTER(USPP,           uspp,           vf);
     REGISTER_FILTER(VFLIP,          vflip,          vf);
     REGISTER_FILTER(VIDSTABDETECT,  vidstabdetect,  vf);
     REGISTER_FILTER(VIDSTABTRANSFORM, vidstabtransform, vf);