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avfilter: add ssim filter
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
parent
346624be4a
commit
5a1f785249
@ -7,6 +7,7 @@ version <next>:
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- little-endian ADPCM_THP decoder
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- Hap decoder and encoder
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- DirectDraw Surface image/texture decoder
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- ssim filter
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version 2.7:
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@ -8834,6 +8834,64 @@ in [-30,0] will filter edges. Default value is 0.
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If a chroma option is not explicitly set, the corresponding luma value
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is set.
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@section ssim
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Obtain the SSIM (Structural SImilarity Metric) between two input videos.
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This filter takes in input two input videos, the first input is
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considered the "main" source and is passed unchanged to the
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output. The second input is used as a "reference" video for computing
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the SSIM.
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Both video inputs must have the same resolution and pixel format for
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this filter to work correctly. Also it assumes that both inputs
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have the same number of frames, which are compared one by one.
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The filter stores the calculated SSIM of each frame.
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The description of the accepted parameters follows.
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@table @option
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@item stats_file, f
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If specified the filter will use the named file to save the PSNR of
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each individual frame.
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@end table
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The file printed if @var{stats_file} is selected, contains a sequence of
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key/value pairs of the form @var{key}:@var{value} for each compared
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couple of frames.
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A description of each shown parameter follows:
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@table @option
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@item n
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sequential number of the input frame, starting from 1
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@item Y, U, V, R, G, B
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SSIM of the compared frames for the component specified by the suffix.
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@item All
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SSIM of the compared frames for the whole frame.
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@item dB
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Same as above but in dB representation.
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@end table
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For example:
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@example
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movie=ref_movie.mpg, setpts=PTS-STARTPTS [main];
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[main][ref] ssim="stats_file=stats.log" [out]
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@end example
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On this example the input file being processed is compared with the
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reference file @file{ref_movie.mpg}. The SSIM of each individual frame
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is stored in @file{stats.log}.
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Another example with both psnr and ssim at same time:
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@example
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ffmpeg -i main.mpg -i ref.mpg -lavfi "ssim;[0:v][1:v]psnr" -f null -
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@end example
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@section stereo3d
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Convert between different stereoscopic image formats.
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@ -197,6 +197,7 @@ OBJS-$(CONFIG_SIGNALSTATS_FILTER) += vf_signalstats.o
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OBJS-$(CONFIG_SMARTBLUR_FILTER) += vf_smartblur.o
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OBJS-$(CONFIG_SPLIT_FILTER) += split.o
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OBJS-$(CONFIG_SPP_FILTER) += vf_spp.o
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OBJS-$(CONFIG_SSIM_FILTER) += vf_ssim.o dualinput.o framesync.o
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OBJS-$(CONFIG_STEREO3D_FILTER) += vf_stereo3d.o
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OBJS-$(CONFIG_SUBTITLES_FILTER) += vf_subtitles.o
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OBJS-$(CONFIG_SUPER2XSAI_FILTER) += vf_super2xsai.o
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@ -212,6 +212,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER(SMARTBLUR, smartblur, vf);
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REGISTER_FILTER(SPLIT, split, vf);
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REGISTER_FILTER(SPP, spp, vf);
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REGISTER_FILTER(SSIM, ssim, vf);
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REGISTER_FILTER(STEREO3D, stereo3d, vf);
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REGISTER_FILTER(SUBTITLES, subtitles, vf);
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REGISTER_FILTER(SUPER2XSAI, super2xsai, vf);
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@ -30,7 +30,7 @@
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#include "libavutil/version.h"
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#define LIBAVFILTER_VERSION_MAJOR 5
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#define LIBAVFILTER_VERSION_MINOR 17
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#define LIBAVFILTER_VERSION_MINOR 18
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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399
libavfilter/vf_ssim.c
Normal file
399
libavfilter/vf_ssim.c
Normal file
@ -0,0 +1,399 @@
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/*
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* Copyright (c) 2003-2013 Loren Merritt
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* Copyright (c) 2015 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/* Computes the Structural Similarity Metric between two video streams.
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* original algorithm:
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* Z. Wang, A. C. Bovik, H. R. Sheikh and E. P. Simoncelli,
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* "Image quality assessment: From error visibility to structural similarity,"
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* IEEE Transactions on Image Processing, vol. 13, no. 4, pp. 600-612, Apr. 2004.
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*
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* To improve speed, this implementation uses the standard approximation of
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* overlapped 8x8 block sums, rather than the original gaussian weights.
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*/
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/*
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* @file
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* Caculate the SSIM between two input videos.
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*/
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "dualinput.h"
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#include "drawutils.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct SSIMContext {
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const AVClass *class;
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FFDualInputContext dinput;
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FILE *stats_file;
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char *stats_file_str;
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int nb_components;
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uint64_t nb_frames;
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double ssim[4];
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char comps[4];
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int *coefs;
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uint8_t rgba_map[4];
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int planewidth[4];
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int planeheight[4];
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int *temp;
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} SSIMContext;
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#define OFFSET(x) offsetof(SSIMContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption ssim_options[] = {
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{"stats_file", "Set file where to store per-frame difference information", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
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{"f", "Set file where to store per-frame difference information", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(ssim);
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static int rgb_coefs[4] = { 1, 1, 1, 3};
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static int yuv_coefs[4] = { 4, 1, 1, 6};
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static int gray_coefs[4] = { 1, 0, 0, 1};
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static void set_meta(AVDictionary **metadata, const char *key, char comp, float d)
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{
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char value[128];
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snprintf(value, sizeof(value), "%0.2f", d);
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if (comp) {
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char key2[128];
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snprintf(key2, sizeof(key2), "%s%c", key, comp);
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av_dict_set(metadata, key2, value, 0);
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} else {
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av_dict_set(metadata, key, value, 0);
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}
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}
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static void ssim_4x4x2_core(const uint8_t *main, int main_stride,
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const uint8_t *ref, int ref_stride,
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int sums[2][4])
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{
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int x, y, z;
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for (z = 0; z < 2; z++) {
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uint32_t s1 = 0, s2 = 0, ss = 0, s12 = 0;
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for (y = 0; y < 4; y++) {
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for (x = 0; x < 4; x++) {
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int a = main[x + y * main_stride];
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int b = ref[x + y * ref_stride];
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s1 += a;
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s2 += b;
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ss += a*a;
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ss += b*b;
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s12 += a*b;
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}
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}
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sums[z][0] = s1;
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sums[z][1] = s2;
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sums[z][2] = ss;
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sums[z][3] = s12;
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main += 4;
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ref += 4;
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}
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}
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static float ssim_end1(int s1, int s2, int ss, int s12)
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{
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static const int ssim_c1 = (int)(.01*.01*255*255*64 + .5);
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static const int ssim_c2 = (int)(.03*.03*255*255*64*63 + .5);
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int fs1 = s1;
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int fs2 = s2;
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int fss = ss;
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int fs12 = s12;
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int vars = fss * 64 - fs1 * fs1 - fs2 * fs2;
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int covar = fs12 * 64 - fs1 * fs2;
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return (float)(2 * fs1 * fs2 + ssim_c1) * (float)(2 * covar + ssim_c2)
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/ ((float)(fs1 * fs1 + fs2 * fs2 + ssim_c1) * (float)(vars + ssim_c2));
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}
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static float ssim_end4(int sum0[5][4], int sum1[5][4], int width)
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{
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float ssim = 0.0;
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int i;
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for( i = 0; i < width; i++ )
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ssim += ssim_end1(sum0[i][0] + sum0[i + 1][0] + sum1[i][0] + sum1[i + 1][0],
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sum0[i][1] + sum0[i + 1][1] + sum1[i][1] + sum1[i + 1][1],
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sum0[i][2] + sum0[i + 1][2] + sum1[i][2] + sum1[i + 1][2],
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sum0[i][3] + sum0[i + 1][3] + sum1[i][3] + sum1[i + 1][3]);
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return ssim;
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}
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static float ssim_plane(uint8_t *main, int main_stride,
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uint8_t *ref, int ref_stride,
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int width, int height, void *temp)
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{
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int z = 0;
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int x, y;
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float ssim = 0.0;
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int (*sum0)[4] = temp;
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int (*sum1)[4] = sum0 + (width >> 2) + 3;
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width >>= 2;
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height >>= 2;
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for (y = 1; y < height; y++) {
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for (; z <= y; z++) {
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FFSWAP(void*, sum0, sum1);
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for (x = 0; x < width; x+=2)
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ssim_4x4x2_core(&main[4 * (x + z * main_stride)], main_stride,
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&ref[4 * (x + z * ref_stride)], ref_stride,
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&sum0[x]);
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}
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for (x = 0; x < width - 1; x += 4)
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ssim += ssim_end4(sum0 + x, sum1 + x, FFMIN(4, width - x - 1));
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}
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return ssim / ((height - 1) * (width - 1));
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}
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static double ssim_db(double ssim, double weight)
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{
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return 10 * (log(weight) / log(10) - log(weight - ssim) / log(10));
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}
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static AVFrame *do_ssim(AVFilterContext *ctx, AVFrame *main,
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const AVFrame *ref)
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{
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AVDictionary **metadata = avpriv_frame_get_metadatap(main);
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SSIMContext *s = ctx->priv;
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float c[4], ssimv;
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int i;
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s->nb_frames++;
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for (i = 0; i < s->nb_components; i++)
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c[i] = ssim_plane(main->data[i], main->linesize[i],
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ref->data[i], ref->linesize[i],
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s->planewidth[i], s->planeheight[i], s->temp);
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ssimv = (c[0] * s->coefs[0] + c[1] * s->coefs[1] + c[2] * s->coefs[2]) / s->coefs[3];
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for (i = 0; i < s->nb_components; i++)
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set_meta(metadata, "lavfi.ssim.", s->comps[i], c[i]);
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set_meta(metadata, "lavfi.ssim.All", 0, ssimv);
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set_meta(metadata, "lavfi.ssim.dB", 0, ssim_db(c[0] * s->coefs[0] + c[1] * s->coefs[1] + c[2] * s->coefs[2], s->coefs[3]));
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if (s->stats_file) {
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fprintf(s->stats_file, "n:%"PRId64" ", s->nb_frames);
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for (i = 0; i < s->nb_components; i++)
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fprintf(s->stats_file, "%c:%f ", s->comps[i], c[i]);
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fprintf(s->stats_file, "All:%f (%f)\n", ssimv, ssim_db(c[0] * s->coefs[0] + c[1] * s->coefs[1] + c[2] * s->coefs[2], s->coefs[3]));
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}
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s->ssim[0] += c[0];
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s->ssim[1] += c[1];
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s->ssim[2] += c[2];
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return main;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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SSIMContext *s = ctx->priv;
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if (s->stats_file_str) {
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s->stats_file = fopen(s->stats_file_str, "w");
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if (!s->stats_file) {
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int err = AVERROR(errno);
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char buf[128];
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av_strerror(err, buf, sizeof(buf));
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av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s: %s\n",
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s->stats_file_str, buf);
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return err;
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}
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}
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s->dinput.process = do_ssim;
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s->dinput.shortest = 1;
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s->dinput.repeatlast = 0;
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_GBRP,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static int config_input_ref(AVFilterLink *inlink)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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AVFilterContext *ctx = inlink->dst;
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SSIMContext *s = ctx->priv;
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int is_rgb;
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s->nb_components = desc->nb_components;
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if (ctx->inputs[0]->w != ctx->inputs[1]->w ||
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ctx->inputs[0]->h != ctx->inputs[1]->h) {
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av_log(ctx, AV_LOG_ERROR, "Width and height of input videos must be same.\n");
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return AVERROR(EINVAL);
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}
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if (ctx->inputs[0]->format != ctx->inputs[1]->format) {
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av_log(ctx, AV_LOG_ERROR, "Inputs must be of same pixel format.\n");
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return AVERROR(EINVAL);
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}
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is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
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s->comps[0] = is_rgb ? 'R' : 'Y';
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s->comps[1] = is_rgb ? 'G' : 'U';
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s->comps[2] = is_rgb ? 'B' : 'V';
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s->comps[3] = 'A';
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if (is_rgb) {
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s->coefs = rgb_coefs;
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} else if (s->nb_components == 1) {
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s->coefs = gray_coefs;
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} else {
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s->coefs = yuv_coefs;
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}
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s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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s->planeheight[0] = s->planeheight[3] = inlink->h;
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s->planewidth[1] = s->planewidth[2] = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
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s->planewidth[0] = s->planewidth[3] = inlink->w;
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s->temp = av_malloc((2 * inlink->w + 12) * sizeof(*s->temp));
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if (!s->temp)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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SSIMContext *s = ctx->priv;
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AVFilterLink *mainlink = ctx->inputs[0];
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int ret;
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outlink->w = mainlink->w;
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outlink->h = mainlink->h;
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outlink->time_base = mainlink->time_base;
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outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
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outlink->frame_rate = mainlink->frame_rate;
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if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
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return ret;
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return 0;
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}
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||||
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
|
||||
{
|
||||
SSIMContext *s = inlink->dst->priv;
|
||||
return ff_dualinput_filter_frame(&s->dinput, inlink, buf);
|
||||
}
|
||||
|
||||
static int request_frame(AVFilterLink *outlink)
|
||||
{
|
||||
SSIMContext *s = outlink->src->priv;
|
||||
return ff_dualinput_request_frame(&s->dinput, outlink);
|
||||
}
|
||||
|
||||
static av_cold void uninit(AVFilterContext *ctx)
|
||||
{
|
||||
SSIMContext *s = ctx->priv;
|
||||
|
||||
if (s->nb_frames > 0) {
|
||||
if (s->nb_components == 3) {
|
||||
av_log(ctx, AV_LOG_INFO, "SSIM %c:%f %c:%f %c:%f All:%f (%f)\n",
|
||||
s->comps[0], s->ssim[0] / s->nb_frames,
|
||||
s->comps[1], s->ssim[1] / s->nb_frames,
|
||||
s->comps[2], s->ssim[2] / s->nb_frames,
|
||||
(s->ssim[0] * 4 + s->ssim[1] + s->ssim[2]) / (s->nb_frames * 6),
|
||||
ssim_db(s->ssim[0] * 4 + s->ssim[1] + s->ssim[2], s->nb_frames * 6));
|
||||
} else if (s->nb_components == 1) {
|
||||
av_log(ctx, AV_LOG_INFO, "SSIM All:%f (%f)\n",
|
||||
s->ssim[0] / s->nb_frames, ssim_db(s->ssim[0], s->nb_frames));
|
||||
}
|
||||
}
|
||||
|
||||
ff_dualinput_uninit(&s->dinput);
|
||||
|
||||
if (s->stats_file)
|
||||
fclose(s->stats_file);
|
||||
|
||||
av_freep(&s->temp);
|
||||
}
|
||||
|
||||
static const AVFilterPad ssim_inputs[] = {
|
||||
{
|
||||
.name = "main",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.filter_frame = filter_frame,
|
||||
},{
|
||||
.name = "reference",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.filter_frame = filter_frame,
|
||||
.config_props = config_input_ref,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
static const AVFilterPad ssim_outputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.config_props = config_output,
|
||||
.request_frame = request_frame,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
AVFilter ff_vf_ssim = {
|
||||
.name = "ssim",
|
||||
.description = NULL_IF_CONFIG_SMALL("Calculate the SSIM between two video streams."),
|
||||
.init = init,
|
||||
.uninit = uninit,
|
||||
.query_formats = query_formats,
|
||||
.priv_size = sizeof(SSIMContext),
|
||||
.priv_class = &ssim_class,
|
||||
.inputs = ssim_inputs,
|
||||
.outputs = ssim_outputs,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user