514 lines
16 KiB
C
514 lines
16 KiB
C
/*
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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/avstring.h"
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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 "drawutils.h"
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#include "formats.h"
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#include "framesync2.h"
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#include "internal.h"
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#include "ssim.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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FFFrameSync fs;
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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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int max;
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uint64_t nb_frames;
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double ssim[4], ssim_total;
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char comps[4];
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float coefs[4];
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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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int is_rgb;
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float (*ssim_plane)(SSIMDSPContext *dsp,
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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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int max);
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SSIMDSPContext dsp;
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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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FRAMESYNC_DEFINE_CLASS(ssim, SSIMContext, fs);
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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_4x4xn_16bit(const uint8_t *main8, ptrdiff_t main_stride,
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const uint8_t *ref8, ptrdiff_t ref_stride,
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int64_t (*sums)[4], int width)
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{
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const uint16_t *main16 = (const uint16_t *)main8;
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const uint16_t *ref16 = (const uint16_t *)ref8;
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int x, y, z;
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main_stride >>= 1;
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ref_stride >>= 1;
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for (z = 0; z < width; z++) {
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uint64_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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unsigned a = main16[x + y * main_stride];
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unsigned b = ref16[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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main16 += 4;
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ref16 += 4;
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}
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}
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static void ssim_4x4xn_8bit(const uint8_t *main, ptrdiff_t main_stride,
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const uint8_t *ref, ptrdiff_t ref_stride,
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int (*sums)[4], int width)
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{
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int x, y, z;
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for (z = 0; z < width; 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_end1x(int64_t s1, int64_t s2, int64_t ss, int64_t s12, int max)
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{
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int64_t ssim_c1 = (int64_t)(.01*.01*max*max*64 + .5);
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int64_t ssim_c2 = (int64_t)(.03*.03*max*max*64*63 + .5);
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int64_t fs1 = s1;
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int64_t fs2 = s2;
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int64_t fss = ss;
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int64_t fs12 = s12;
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int64_t vars = fss * 64 - fs1 * fs1 - fs2 * fs2;
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int64_t 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_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_endn_16bit(const int64_t (*sum0)[4], const int64_t (*sum1)[4], int width, int max)
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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_end1x(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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max);
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return ssim;
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}
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static float ssim_endn_8bit(const int (*sum0)[4], const int (*sum1)[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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#define SUM_LEN(w) (((w) >> 2) + 3)
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static float ssim_plane_16bit(SSIMDSPContext *dsp,
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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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int max)
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{
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int z = 0, y;
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float ssim = 0.0;
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int64_t (*sum0)[4] = temp;
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int64_t (*sum1)[4] = sum0 + SUM_LEN(width);
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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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ssim_4x4xn_16bit(&main[4 * z * main_stride], main_stride,
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&ref[4 * z * ref_stride], ref_stride,
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sum0, width);
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}
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ssim += ssim_endn_16bit((const int64_t (*)[4])sum0, (const int64_t (*)[4])sum1, width - 1, max);
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}
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return ssim / ((height - 1) * (width - 1));
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}
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static float ssim_plane(SSIMDSPContext *dsp,
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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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int max)
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{
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int z = 0, 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 + SUM_LEN(width);
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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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dsp->ssim_4x4_line(&main[4 * z * main_stride], main_stride,
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&ref[4 * z * ref_stride], ref_stride,
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sum0, width);
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}
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ssim += dsp->ssim_end_line((const int (*)[4])sum0, (const int (*)[4])sum1, width - 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 * log10(weight / (weight - ssim));
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}
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static int do_ssim(FFFrameSync *fs)
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{
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AVFilterContext *ctx = fs->parent;
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SSIMContext *s = ctx->priv;
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AVFrame *main, *ref;
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AVDictionary **metadata;
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float c[4], ssimv = 0.0;
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int ret, i;
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ret = ff_framesync2_dualinput_get(fs, &main, &ref);
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if (ret < 0)
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return ret;
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if (!ref)
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return ff_filter_frame(ctx->outputs[0], main);
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metadata = &main->metadata;
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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] = s->ssim_plane(&s->dsp, 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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s->max);
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ssimv += s->coefs[i] * c[i];
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s->ssim[i] += c[i];
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}
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for (i = 0; i < s->nb_components; i++) {
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int cidx = s->is_rgb ? s->rgba_map[i] : i;
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set_meta(metadata, "lavfi.ssim.", s->comps[i], c[cidx]);
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}
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s->ssim_total += ssimv;
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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(ssimv, 1.0));
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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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int cidx = s->is_rgb ? s->rgba_map[i] : i;
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fprintf(s->stats_file, "%c:%f ", s->comps[i], c[cidx]);
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}
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fprintf(s->stats_file, "All:%f (%f)\n", ssimv, ssim_db(ssimv, 1.0));
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}
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return ff_filter_frame(ctx->outputs[0], 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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if (!strcmp(s->stats_file_str, "-")) {
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s->stats_file = stdout;
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} else {
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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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}
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s->fs.on_event = do_ssim;
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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, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10,
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AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY16,
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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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#define PF(suf) AV_PIX_FMT_YUV420##suf, AV_PIX_FMT_YUV422##suf, AV_PIX_FMT_YUV444##suf, AV_PIX_FMT_GBR##suf
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PF(P9), PF(P10), PF(P12), PF(P14), PF(P16),
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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 sum = 0, i;
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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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s->is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
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s->comps[0] = s->is_rgb ? 'R' : 'Y';
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s->comps[1] = s->is_rgb ? 'G' : 'U';
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s->comps[2] = s->is_rgb ? 'B' : 'V';
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s->comps[3] = 'A';
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s->planeheight[1] = s->planeheight[2] = AV_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] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
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s->planewidth[0] = s->planewidth[3] = inlink->w;
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for (i = 0; i < s->nb_components; i++)
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sum += s->planeheight[i] * s->planewidth[i];
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for (i = 0; i < s->nb_components; i++)
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s->coefs[i] = (double) s->planeheight[i] * s->planewidth[i] / sum;
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s->temp = av_mallocz_array(2 * SUM_LEN(inlink->w), (desc->comp[0].depth > 8) ? sizeof(int64_t[4]) : sizeof(int[4]));
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if (!s->temp)
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return AVERROR(ENOMEM);
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s->max = (1 << desc->comp[0].depth) - 1;
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s->ssim_plane = desc->comp[0].depth > 8 ? ssim_plane_16bit : ssim_plane;
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s->dsp.ssim_4x4_line = ssim_4x4xn_8bit;
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s->dsp.ssim_end_line = ssim_endn_8bit;
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if (ARCH_X86)
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ff_ssim_init_x86(&s->dsp);
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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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ret = ff_framesync2_init_dualinput(&s->fs, ctx);
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if (ret < 0)
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return 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_framesync2_configure(&s->fs)) < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int activate(AVFilterContext *ctx)
|
|
{
|
|
SSIMContext *s = ctx->priv;
|
|
return ff_framesync2_activate(&s->fs);
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
SSIMContext *s = ctx->priv;
|
|
|
|
if (s->nb_frames > 0) {
|
|
char buf[256];
|
|
int i;
|
|
buf[0] = 0;
|
|
for (i = 0; i < s->nb_components; i++) {
|
|
int c = s->is_rgb ? s->rgba_map[i] : i;
|
|
av_strlcatf(buf, sizeof(buf), " %c:%f (%f)", s->comps[i], s->ssim[c] / s->nb_frames,
|
|
ssim_db(s->ssim[c], s->nb_frames));
|
|
}
|
|
av_log(ctx, AV_LOG_INFO, "SSIM%s All:%f (%f)\n", buf,
|
|
s->ssim_total / s->nb_frames, ssim_db(s->ssim_total, s->nb_frames));
|
|
}
|
|
|
|
ff_framesync2_uninit(&s->fs);
|
|
|
|
if (s->stats_file && s->stats_file != stdout)
|
|
fclose(s->stats_file);
|
|
|
|
av_freep(&s->temp);
|
|
}
|
|
|
|
static const AVFilterPad ssim_inputs[] = {
|
|
{
|
|
.name = "main",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
},{
|
|
.name = "reference",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input_ref,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad ssim_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_vf_ssim = {
|
|
.name = "ssim",
|
|
.description = NULL_IF_CONFIG_SMALL("Calculate the SSIM between two video streams."),
|
|
.preinit = ssim_framesync_preinit,
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
.activate = activate,
|
|
.priv_size = sizeof(SSIMContext),
|
|
.priv_class = &ssim_class,
|
|
.inputs = ssim_inputs,
|
|
.outputs = ssim_outputs,
|
|
};
|