lavfi: add spp filter.

Changelog

@@ -67,6 +67,7 @@ version <next>:
 - ffprobe -show_chapters option
 - WavPack encoding through libwavpack
 - rotate filter
+- spp filter ported from libmpcodecs
 
 
 version 1.2:

LICENSE

@@ -42,6 +42,7 @@ Specifically, the GPL parts of FFmpeg are
     - vf_pp.c
     - vf_sab.c
     - vf_smartblur.c
+    - vf_spp.c
     - vf_stereo3d.c
     - vf_super2xsai.c
     - vf_tinterlace.c

configure

@@ -2175,6 +2175,7 @@ sab_filter_deps="gpl swscale"
 scale_filter_deps="swscale"
 smartblur_filter_deps="gpl swscale"
 showspectrum_filter_deps="avcodec rdft"
+spp_filter_deps="gpl avcodec fft"
 stereo3d_filter_deps="gpl"
 subtitles_filter_deps="avformat avcodec libass"
 super2xsai_filter_deps="gpl"

doc/filters.texi

@@ -6476,6 +6476,42 @@ stereo3d=abl:sbsr
 @end example
 @end itemize
 
+@section spp
+
+Apply a simple postprocessing filter that compresses and decompresses the image
+at several (or - in the case of @option{quality} level @code{6} - all) shifts
+and average the results.
+
+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 0-6. If set to @code{0}, the filter will have no
+effect. A value of @code{6} 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).
+
+@item mode
+Set thresholding mode. Available modes are:
+
+@table @samp
+@item hard
+Set hard thresholding (default).
+@item soft
+Set soft thresholding (better de-ringing effect, but likely blurrier).
+@end table
+
+@item use_bframe_qp
+Enable the use of the QP from the B-Frames if set to @code{1}. Using this
+option may cause flicker since the B-Frames have often larger QP. Default is
+@code{0} (not enabled).
+@end table
+
 @anchor{subtitles}
 @section subtitles
 

libavfilter/Makefile

@@ -182,6 +182,7 @@ OBJS-$(CONFIG_SETTB_FILTER)                  += f_settb.o
 OBJS-$(CONFIG_SHOWINFO_FILTER)               += vf_showinfo.o
 OBJS-$(CONFIG_SMARTBLUR_FILTER)              += vf_smartblur.o
 OBJS-$(CONFIG_SPLIT_FILTER)                  += split.o
+OBJS-$(CONFIG_SPP_FILTER)                    += vf_spp.o
 OBJS-$(CONFIG_STEREO3D_FILTER)               += vf_stereo3d.o
 OBJS-$(CONFIG_SUBTITLES_FILTER)              += vf_subtitles.o
 OBJS-$(CONFIG_SUPER2XSAI_FILTER)             += vf_super2xsai.o

libavfilter/allfilters.c

@@ -177,6 +177,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(SHOWINFO,       showinfo,       vf);
     REGISTER_FILTER(SMARTBLUR,      smartblur,      vf);
     REGISTER_FILTER(SPLIT,          split,          vf);
+    REGISTER_FILTER(SPP,            spp,            vf);
     REGISTER_FILTER(STEREO3D,       stereo3d,       vf);
     REGISTER_FILTER(SUBTITLES,      subtitles,      vf);
     REGISTER_FILTER(SUPER2XSAI,     super2xsai,     vf);

libavfilter/version.h

@@ -30,8 +30,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  76
-#define LIBAVFILTER_VERSION_MICRO 101
+#define LIBAVFILTER_VERSION_MINOR  77
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \

libavfilter/vf_spp.h

+/*
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2013 Clément Bœsch
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef AVFILTER_SPP_H
+#define AVFILTER_SPP_H
+
+#include "libavcodec/avcodec.h"
+#include "libavcodec/dsputil.h"
+#include "avfilter.h"
+
+#define MAX_LEVEL 6 /* quality levels */
+
+typedef struct {
+    const AVClass *av_class;
+
+    int log2_count;
+    int qp;
+    int mode;
+    int qscale_type;
+    int temp_linesize;
+    uint8_t *src;
+    int16_t *temp;
+    AVCodecContext *avctx;
+    DSPContext dsp;
+    int8_t *non_b_qp_table;
+    int non_b_qp_alloc_size;
+    int use_bframe_qp;
+    int hsub, vsub;
+
+    void (*store_slice)(uint8_t *dst, const int16_t *src,
+                        int dst_stride, int src_stride,
+                        int width, int height, int log2_scale,
+                        const uint8_t dither[8][8]);
+
+    void (*requantize)(int16_t dst[64], const int16_t src[64],
+                       int qp, const uint8_t *permutation);
+} SPPContext;
+
+void ff_spp_init_x86(SPPContext *s);
+
+#endif /* AVFILTER_SPP_H */

libavfilter/x86/Makefile

 OBJS-$(CONFIG_GRADFUN_FILTER)                += x86/vf_gradfun.o
 OBJS-$(CONFIG_HQDN3D_FILTER)                 += x86/vf_hqdn3d_init.o
+OBJS-$(CONFIG_SPP_FILTER)                    += x86/vf_spp.o
 OBJS-$(CONFIG_VOLUME_FILTER)                 += x86/af_volume_init.o
 OBJS-$(CONFIG_YADIF_FILTER)                  += x86/vf_yadif_init.o