LCOV - code coverage report
Current view: top level - libavfilter - vf_ssim.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 152 232 65.5 %
Date: 2017-12-17 04:34:43 Functions: 14 20 70.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2003-2013 Loren Merritt
       3             :  * Copyright (c) 2015 Paul B Mahol
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /* Computes the Structural Similarity Metric between two video streams.
      23             :  * original algorithm:
      24             :  * Z. Wang, A. C. Bovik, H. R. Sheikh and E. P. Simoncelli,
      25             :  *   "Image quality assessment: From error visibility to structural similarity,"
      26             :  *   IEEE Transactions on Image Processing, vol. 13, no. 4, pp. 600-612, Apr. 2004.
      27             :  *
      28             :  * To improve speed, this implementation uses the standard approximation of
      29             :  * overlapped 8x8 block sums, rather than the original gaussian weights.
      30             :  */
      31             : 
      32             : /*
      33             :  * @file
      34             :  * Caculate the SSIM between two input videos.
      35             :  */
      36             : 
      37             : #include "libavutil/avstring.h"
      38             : #include "libavutil/opt.h"
      39             : #include "libavutil/pixdesc.h"
      40             : #include "avfilter.h"
      41             : #include "drawutils.h"
      42             : #include "formats.h"
      43             : #include "framesync.h"
      44             : #include "internal.h"
      45             : #include "ssim.h"
      46             : #include "video.h"
      47             : 
      48             : typedef struct SSIMContext {
      49             :     const AVClass *class;
      50             :     FFFrameSync fs;
      51             :     FILE *stats_file;
      52             :     char *stats_file_str;
      53             :     int nb_components;
      54             :     int max;
      55             :     uint64_t nb_frames;
      56             :     double ssim[4], ssim_total;
      57             :     char comps[4];
      58             :     float coefs[4];
      59             :     uint8_t rgba_map[4];
      60             :     int planewidth[4];
      61             :     int planeheight[4];
      62             :     int *temp;
      63             :     int is_rgb;
      64             :     float (*ssim_plane)(SSIMDSPContext *dsp,
      65             :                         uint8_t *main, int main_stride,
      66             :                         uint8_t *ref, int ref_stride,
      67             :                         int width, int height, void *temp,
      68             :                         int max);
      69             :     SSIMDSPContext dsp;
      70             : } SSIMContext;
      71             : 
      72             : #define OFFSET(x) offsetof(SSIMContext, x)
      73             : #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
      74             : 
      75             : static const AVOption ssim_options[] = {
      76             :     {"stats_file", "Set file where to store per-frame difference information", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
      77             :     {"f",          "Set file where to store per-frame difference information", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
      78             :     { NULL }
      79             : };
      80             : 
      81           4 : FRAMESYNC_DEFINE_CLASS(ssim, SSIMContext, fs);
      82             : 
      83          50 : static void set_meta(AVDictionary **metadata, const char *key, char comp, float d)
      84             : {
      85             :     char value[128];
      86          50 :     snprintf(value, sizeof(value), "%0.2f", d);
      87          50 :     if (comp) {
      88             :         char key2[128];
      89          30 :         snprintf(key2, sizeof(key2), "%s%c", key, comp);
      90          30 :         av_dict_set(metadata, key2, value, 0);
      91             :     } else {
      92          20 :         av_dict_set(metadata, key, value, 0);
      93             :     }
      94          50 : }
      95             : 
      96           0 : static void ssim_4x4xn_16bit(const uint8_t *main8, ptrdiff_t main_stride,
      97             :                              const uint8_t *ref8, ptrdiff_t ref_stride,
      98             :                              int64_t (*sums)[4], int width)
      99             : {
     100           0 :     const uint16_t *main16 = (const uint16_t *)main8;
     101           0 :     const uint16_t *ref16  = (const uint16_t *)ref8;
     102             :     int x, y, z;
     103             : 
     104           0 :     main_stride >>= 1;
     105           0 :     ref_stride >>= 1;
     106             : 
     107           0 :     for (z = 0; z < width; z++) {
     108           0 :         uint64_t s1 = 0, s2 = 0, ss = 0, s12 = 0;
     109             : 
     110           0 :         for (y = 0; y < 4; y++) {
     111           0 :             for (x = 0; x < 4; x++) {
     112           0 :                 unsigned a = main16[x + y * main_stride];
     113           0 :                 unsigned b = ref16[x + y * ref_stride];
     114             : 
     115           0 :                 s1  += a;
     116           0 :                 s2  += b;
     117           0 :                 ss  += a*a;
     118           0 :                 ss  += b*b;
     119           0 :                 s12 += a*b;
     120             :             }
     121             :         }
     122             : 
     123           0 :         sums[z][0] = s1;
     124           0 :         sums[z][1] = s2;
     125           0 :         sums[z][2] = ss;
     126           0 :         sums[z][3] = s12;
     127           0 :         main16 += 4;
     128           0 :         ref16 += 4;
     129             :     }
     130           0 : }
     131             : 
     132        1500 : static void ssim_4x4xn_8bit(const uint8_t *main, ptrdiff_t main_stride,
     133             :                             const uint8_t *ref, ptrdiff_t ref_stride,
     134             :                             int (*sums)[4], int width)
     135             : {
     136             :     int x, y, z;
     137             : 
     138       95000 :     for (z = 0; z < width; z++) {
     139       93500 :         uint32_t s1 = 0, s2 = 0, ss = 0, s12 = 0;
     140             : 
     141      467500 :         for (y = 0; y < 4; y++) {
     142     1870000 :             for (x = 0; x < 4; x++) {
     143     1496000 :                 int a = main[x + y * main_stride];
     144     1496000 :                 int b = ref[x + y * ref_stride];
     145             : 
     146     1496000 :                 s1  += a;
     147     1496000 :                 s2  += b;
     148     1496000 :                 ss  += a*a;
     149     1496000 :                 ss  += b*b;
     150     1496000 :                 s12 += a*b;
     151             :             }
     152             :         }
     153             : 
     154       93500 :         sums[z][0] = s1;
     155       93500 :         sums[z][1] = s2;
     156       93500 :         sums[z][2] = ss;
     157       93500 :         sums[z][3] = s12;
     158       93500 :         main += 4;
     159       93500 :         ref += 4;
     160             :     }
     161        1500 : }
     162             : 
     163           0 : static float ssim_end1x(int64_t s1, int64_t s2, int64_t ss, int64_t s12, int max)
     164             : {
     165           0 :     int64_t ssim_c1 = (int64_t)(.01*.01*max*max*64 + .5);
     166           0 :     int64_t ssim_c2 = (int64_t)(.03*.03*max*max*64*63 + .5);
     167             : 
     168           0 :     int64_t fs1 = s1;
     169           0 :     int64_t fs2 = s2;
     170           0 :     int64_t fss = ss;
     171           0 :     int64_t fs12 = s12;
     172           0 :     int64_t vars = fss * 64 - fs1 * fs1 - fs2 * fs2;
     173           0 :     int64_t covar = fs12 * 64 - fs1 * fs2;
     174             : 
     175           0 :     return (float)(2 * fs1 * fs2 + ssim_c1) * (float)(2 * covar + ssim_c2)
     176           0 :          / ((float)(fs1 * fs1 + fs2 * fs2 + ssim_c1) * (float)(vars + ssim_c2));
     177             : }
     178             : 
     179       90160 : static float ssim_end1(int s1, int s2, int ss, int s12)
     180             : {
     181             :     static const int ssim_c1 = (int)(.01*.01*255*255*64 + .5);
     182             :     static const int ssim_c2 = (int)(.03*.03*255*255*64*63 + .5);
     183             : 
     184       90160 :     int fs1 = s1;
     185       90160 :     int fs2 = s2;
     186       90160 :     int fss = ss;
     187       90160 :     int fs12 = s12;
     188       90160 :     int vars = fss * 64 - fs1 * fs1 - fs2 * fs2;
     189       90160 :     int covar = fs12 * 64 - fs1 * fs2;
     190             : 
     191       90160 :     return (float)(2 * fs1 * fs2 + ssim_c1) * (float)(2 * covar + ssim_c2)
     192       90160 :          / ((float)(fs1 * fs1 + fs2 * fs2 + ssim_c1) * (float)(vars + ssim_c2));
     193             : }
     194             : 
     195           0 : static float ssim_endn_16bit(const int64_t (*sum0)[4], const int64_t (*sum1)[4], int width, int max)
     196             : {
     197           0 :     float ssim = 0.0;
     198             :     int i;
     199             : 
     200           0 :     for (i = 0; i < width; i++)
     201           0 :         ssim += ssim_end1x(sum0[i][0] + sum0[i + 1][0] + sum1[i][0] + sum1[i + 1][0],
     202           0 :                            sum0[i][1] + sum0[i + 1][1] + sum1[i][1] + sum1[i + 1][1],
     203           0 :                            sum0[i][2] + sum0[i + 1][2] + sum1[i][2] + sum1[i + 1][2],
     204           0 :                            sum0[i][3] + sum0[i + 1][3] + sum1[i][3] + sum1[i + 1][3],
     205             :                            max);
     206           0 :     return ssim;
     207             : }
     208             : 
     209        1470 : static float ssim_endn_8bit(const int (*sum0)[4], const int (*sum1)[4], int width)
     210             : {
     211        1470 :     float ssim = 0.0;
     212             :     int i;
     213             : 
     214       91630 :     for (i = 0; i < width; i++)
     215      270480 :         ssim += ssim_end1(sum0[i][0] + sum0[i + 1][0] + sum1[i][0] + sum1[i + 1][0],
     216       90160 :                           sum0[i][1] + sum0[i + 1][1] + sum1[i][1] + sum1[i + 1][1],
     217       90160 :                           sum0[i][2] + sum0[i + 1][2] + sum1[i][2] + sum1[i + 1][2],
     218       90160 :                           sum0[i][3] + sum0[i + 1][3] + sum1[i][3] + sum1[i + 1][3]);
     219        1470 :     return ssim;
     220             : }
     221             : 
     222             : #define SUM_LEN(w) (((w) >> 2) + 3)
     223             : 
     224           0 : static float ssim_plane_16bit(SSIMDSPContext *dsp,
     225             :                               uint8_t *main, int main_stride,
     226             :                               uint8_t *ref, int ref_stride,
     227             :                               int width, int height, void *temp,
     228             :                               int max)
     229             : {
     230           0 :     int z = 0, y;
     231           0 :     float ssim = 0.0;
     232           0 :     int64_t (*sum0)[4] = temp;
     233           0 :     int64_t (*sum1)[4] = sum0 + SUM_LEN(width);
     234             : 
     235           0 :     width >>= 2;
     236           0 :     height >>= 2;
     237             : 
     238           0 :     for (y = 1; y < height; y++) {
     239           0 :         for (; z <= y; z++) {
     240           0 :             FFSWAP(void*, sum0, sum1);
     241           0 :             ssim_4x4xn_16bit(&main[4 * z * main_stride], main_stride,
     242           0 :                              &ref[4 * z * ref_stride], ref_stride,
     243             :                              sum0, width);
     244             :         }
     245             : 
     246           0 :         ssim += ssim_endn_16bit((const int64_t (*)[4])sum0, (const int64_t (*)[4])sum1, width - 1, max);
     247             :     }
     248             : 
     249           0 :     return ssim / ((height - 1) * (width - 1));
     250             : }
     251             : 
     252          30 : static float ssim_plane(SSIMDSPContext *dsp,
     253             :                         uint8_t *main, int main_stride,
     254             :                         uint8_t *ref, int ref_stride,
     255             :                         int width, int height, void *temp,
     256             :                         int max)
     257             : {
     258          30 :     int z = 0, y;
     259          30 :     float ssim = 0.0;
     260          30 :     int (*sum0)[4] = temp;
     261          30 :     int (*sum1)[4] = sum0 + SUM_LEN(width);
     262             : 
     263          30 :     width >>= 2;
     264          30 :     height >>= 2;
     265             : 
     266        1500 :     for (y = 1; y < height; y++) {
     267        2970 :         for (; z <= y; z++) {
     268        1500 :             FFSWAP(void*, sum0, sum1);
     269        3000 :             dsp->ssim_4x4_line(&main[4 * z * main_stride], main_stride,
     270        1500 :                                &ref[4 * z * ref_stride], ref_stride,
     271             :                                sum0, width);
     272             :         }
     273             : 
     274        1470 :         ssim += dsp->ssim_end_line((const int (*)[4])sum0, (const int (*)[4])sum1, width - 1);
     275             :     }
     276             : 
     277          30 :     return ssim / ((height - 1) * (width - 1));
     278             : }
     279             : 
     280          18 : static double ssim_db(double ssim, double weight)
     281             : {
     282          18 :     return 10 * log10(weight / (weight - ssim));
     283             : }
     284             : 
     285          10 : static int do_ssim(FFFrameSync *fs)
     286             : {
     287          10 :     AVFilterContext *ctx = fs->parent;
     288          10 :     SSIMContext *s = ctx->priv;
     289             :     AVFrame *master, *ref;
     290             :     AVDictionary **metadata;
     291          10 :     float c[4], ssimv = 0.0;
     292             :     int ret, i;
     293             : 
     294          10 :     ret = ff_framesync_dualinput_get(fs, &master, &ref);
     295          10 :     if (ret < 0)
     296           0 :         return ret;
     297          10 :     if (!ref)
     298           0 :         return ff_filter_frame(ctx->outputs[0], master);
     299          10 :     metadata = &master->metadata;
     300             : 
     301          10 :     s->nb_frames++;
     302             : 
     303          40 :     for (i = 0; i < s->nb_components; i++) {
     304         120 :         c[i] = s->ssim_plane(&s->dsp, master->data[i], master->linesize[i],
     305          60 :                              ref->data[i], ref->linesize[i],
     306          30 :                              s->planewidth[i], s->planeheight[i], s->temp,
     307             :                              s->max);
     308          30 :         ssimv += s->coefs[i] * c[i];
     309          30 :         s->ssim[i] += c[i];
     310             :     }
     311          40 :     for (i = 0; i < s->nb_components; i++) {
     312          30 :         int cidx = s->is_rgb ? s->rgba_map[i] : i;
     313          30 :         set_meta(metadata, "lavfi.ssim.", s->comps[i], c[cidx]);
     314             :     }
     315          10 :     s->ssim_total += ssimv;
     316             : 
     317          10 :     set_meta(metadata, "lavfi.ssim.All", 0, ssimv);
     318          10 :     set_meta(metadata, "lavfi.ssim.dB", 0, ssim_db(ssimv, 1.0));
     319             : 
     320          10 :     if (s->stats_file) {
     321           0 :         fprintf(s->stats_file, "n:%"PRId64" ", s->nb_frames);
     322             : 
     323           0 :         for (i = 0; i < s->nb_components; i++) {
     324           0 :             int cidx = s->is_rgb ? s->rgba_map[i] : i;
     325           0 :             fprintf(s->stats_file, "%c:%f ", s->comps[i], c[cidx]);
     326             :         }
     327             : 
     328           0 :         fprintf(s->stats_file, "All:%f (%f)\n", ssimv, ssim_db(ssimv, 1.0));
     329             :     }
     330             : 
     331          10 :     return ff_filter_frame(ctx->outputs[0], master);
     332             : }
     333             : 
     334           4 : static av_cold int init(AVFilterContext *ctx)
     335             : {
     336           4 :     SSIMContext *s = ctx->priv;
     337             : 
     338           4 :     if (s->stats_file_str) {
     339           0 :         if (!strcmp(s->stats_file_str, "-")) {
     340           0 :             s->stats_file = stdout;
     341             :         } else {
     342           0 :             s->stats_file = fopen(s->stats_file_str, "w");
     343           0 :             if (!s->stats_file) {
     344           0 :                 int err = AVERROR(errno);
     345             :                 char buf[128];
     346           0 :                 av_strerror(err, buf, sizeof(buf));
     347           0 :                 av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s: %s\n",
     348             :                        s->stats_file_str, buf);
     349           0 :                 return err;
     350             :             }
     351             :         }
     352             :     }
     353             : 
     354           4 :     s->fs.on_event = do_ssim;
     355           4 :     return 0;
     356             : }
     357             : 
     358           2 : static int query_formats(AVFilterContext *ctx)
     359             : {
     360             :     static const enum AVPixelFormat pix_fmts[] = {
     361             :         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10,
     362             :         AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY16,
     363             :         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
     364             :         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
     365             :         AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
     366             :         AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
     367             :         AV_PIX_FMT_GBRP,
     368             : #define PF(suf) AV_PIX_FMT_YUV420##suf,  AV_PIX_FMT_YUV422##suf,  AV_PIX_FMT_YUV444##suf, AV_PIX_FMT_GBR##suf
     369             :         PF(P9), PF(P10), PF(P12), PF(P14), PF(P16),
     370             :         AV_PIX_FMT_NONE
     371             :     };
     372             : 
     373           2 :     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
     374           2 :     if (!fmts_list)
     375           0 :         return AVERROR(ENOMEM);
     376           2 :     return ff_set_common_formats(ctx, fmts_list);
     377             : }
     378             : 
     379           2 : static int config_input_ref(AVFilterLink *inlink)
     380             : {
     381           2 :     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     382           2 :     AVFilterContext *ctx  = inlink->dst;
     383           2 :     SSIMContext *s = ctx->priv;
     384           2 :     int sum = 0, i;
     385             : 
     386           2 :     s->nb_components = desc->nb_components;
     387             : 
     388           4 :     if (ctx->inputs[0]->w != ctx->inputs[1]->w ||
     389           2 :         ctx->inputs[0]->h != ctx->inputs[1]->h) {
     390           0 :         av_log(ctx, AV_LOG_ERROR, "Width and height of input videos must be same.\n");
     391           0 :         return AVERROR(EINVAL);
     392             :     }
     393           2 :     if (ctx->inputs[0]->format != ctx->inputs[1]->format) {
     394           0 :         av_log(ctx, AV_LOG_ERROR, "Inputs must be of same pixel format.\n");
     395           0 :         return AVERROR(EINVAL);
     396             :     }
     397             : 
     398           2 :     s->is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
     399           2 :     s->comps[0] = s->is_rgb ? 'R' : 'Y';
     400           2 :     s->comps[1] = s->is_rgb ? 'G' : 'U';
     401           2 :     s->comps[2] = s->is_rgb ? 'B' : 'V';
     402           2 :     s->comps[3] = 'A';
     403             : 
     404           2 :     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
     405           2 :     s->planeheight[0] = s->planeheight[3] = inlink->h;
     406           2 :     s->planewidth[1]  = s->planewidth[2]  = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
     407           2 :     s->planewidth[0]  = s->planewidth[3]  = inlink->w;
     408           8 :     for (i = 0; i < s->nb_components; i++)
     409           6 :         sum += s->planeheight[i] * s->planewidth[i];
     410           8 :     for (i = 0; i < s->nb_components; i++)
     411           6 :         s->coefs[i] = (double) s->planeheight[i] * s->planewidth[i] / sum;
     412             : 
     413           2 :     s->temp = av_mallocz_array(2 * SUM_LEN(inlink->w), (desc->comp[0].depth > 8) ? sizeof(int64_t[4]) : sizeof(int[4]));
     414           2 :     if (!s->temp)
     415           0 :         return AVERROR(ENOMEM);
     416           2 :     s->max = (1 << desc->comp[0].depth) - 1;
     417             : 
     418           2 :     s->ssim_plane = desc->comp[0].depth > 8 ? ssim_plane_16bit : ssim_plane;
     419           2 :     s->dsp.ssim_4x4_line = ssim_4x4xn_8bit;
     420           2 :     s->dsp.ssim_end_line = ssim_endn_8bit;
     421             :     if (ARCH_X86)
     422           2 :         ff_ssim_init_x86(&s->dsp);
     423             : 
     424           2 :     return 0;
     425             : }
     426             : 
     427           2 : static int config_output(AVFilterLink *outlink)
     428             : {
     429           2 :     AVFilterContext *ctx = outlink->src;
     430           2 :     SSIMContext *s = ctx->priv;
     431           2 :     AVFilterLink *mainlink = ctx->inputs[0];
     432             :     int ret;
     433             : 
     434           2 :     ret = ff_framesync_init_dualinput(&s->fs, ctx);
     435           2 :     if (ret < 0)
     436           0 :         return ret;
     437           2 :     outlink->w = mainlink->w;
     438           2 :     outlink->h = mainlink->h;
     439           2 :     outlink->time_base = mainlink->time_base;
     440           2 :     outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
     441           2 :     outlink->frame_rate = mainlink->frame_rate;
     442             : 
     443           2 :     if ((ret = ff_framesync_configure(&s->fs)) < 0)
     444           0 :         return ret;
     445             : 
     446           2 :     return 0;
     447             : }
     448             : 
     449          31 : static int activate(AVFilterContext *ctx)
     450             : {
     451          31 :     SSIMContext *s = ctx->priv;
     452          31 :     return ff_framesync_activate(&s->fs);
     453             : }
     454             : 
     455           4 : static av_cold void uninit(AVFilterContext *ctx)
     456             : {
     457           4 :     SSIMContext *s = ctx->priv;
     458             : 
     459           4 :     if (s->nb_frames > 0) {
     460             :         char buf[256];
     461             :         int i;
     462           2 :         buf[0] = 0;
     463           8 :         for (i = 0; i < s->nb_components; i++) {
     464           6 :             int c = s->is_rgb ? s->rgba_map[i] : i;
     465           6 :             av_strlcatf(buf, sizeof(buf), " %c:%f (%f)", s->comps[i], s->ssim[c] / s->nb_frames,
     466           6 :                         ssim_db(s->ssim[c], s->nb_frames));
     467             :         }
     468           4 :         av_log(ctx, AV_LOG_INFO, "SSIM%s All:%f (%f)\n", buf,
     469           4 :                s->ssim_total / s->nb_frames, ssim_db(s->ssim_total, s->nb_frames));
     470             :     }
     471             : 
     472           4 :     ff_framesync_uninit(&s->fs);
     473             : 
     474           4 :     if (s->stats_file && s->stats_file != stdout)
     475           0 :         fclose(s->stats_file);
     476             : 
     477           4 :     av_freep(&s->temp);
     478           4 : }
     479             : 
     480             : static const AVFilterPad ssim_inputs[] = {
     481             :     {
     482             :         .name         = "main",
     483             :         .type         = AVMEDIA_TYPE_VIDEO,
     484             :     },{
     485             :         .name         = "reference",
     486             :         .type         = AVMEDIA_TYPE_VIDEO,
     487             :         .config_props = config_input_ref,
     488             :     },
     489             :     { NULL }
     490             : };
     491             : 
     492             : static const AVFilterPad ssim_outputs[] = {
     493             :     {
     494             :         .name          = "default",
     495             :         .type          = AVMEDIA_TYPE_VIDEO,
     496             :         .config_props  = config_output,
     497             :     },
     498             :     { NULL }
     499             : };
     500             : 
     501             : AVFilter ff_vf_ssim = {
     502             :     .name          = "ssim",
     503             :     .description   = NULL_IF_CONFIG_SMALL("Calculate the SSIM between two video streams."),
     504             :     .preinit       = ssim_framesync_preinit,
     505             :     .init          = init,
     506             :     .uninit        = uninit,
     507             :     .query_formats = query_formats,
     508             :     .activate      = activate,
     509             :     .priv_size     = sizeof(SSIMContext),
     510             :     .priv_class    = &ssim_class,
     511             :     .inputs        = ssim_inputs,
     512             :     .outputs       = ssim_outputs,
     513             : };

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