LCOV - code coverage report
Current view: top level - libavfilter - vf_nlmeans.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 165 0.0 %
Date: 2017-12-14 08:27:08 Functions: 0 11 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2016 Clément Bœsch <u pkh me>
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @todo
      23             :  * - SIMD for compute_safe_ssd_integral_image
      24             :  * - SIMD for final weighted averaging
      25             :  * - better automatic defaults? see "Parameters" @ http://www.ipol.im/pub/art/2011/bcm_nlm/
      26             :  * - temporal support (probably doesn't need any displacement according to
      27             :  *   "Denoising image sequences does not require motion estimation")
      28             :  * - Bayer pixel format support for at least raw photos? (DNG support would be
      29             :  *   handy here)
      30             :  * - FATE test (probably needs visual threshold test mechanism due to the use
      31             :  *   of floats)
      32             :  */
      33             : 
      34             : #include "libavutil/avassert.h"
      35             : #include "libavutil/opt.h"
      36             : #include "libavutil/pixdesc.h"
      37             : #include "avfilter.h"
      38             : #include "formats.h"
      39             : #include "internal.h"
      40             : #include "video.h"
      41             : 
      42             : struct weighted_avg {
      43             :     double total_weight;
      44             :     double sum;
      45             : };
      46             : 
      47             : #define WEIGHT_LUT_NBITS 9
      48             : #define WEIGHT_LUT_SIZE  (1<<WEIGHT_LUT_NBITS)
      49             : 
      50             : typedef struct NLMeansContext {
      51             :     const AVClass *class;
      52             :     int nb_planes;
      53             :     int chroma_w, chroma_h;
      54             :     double pdiff_scale;                         // invert of the filtering parameter (sigma*10) squared
      55             :     double sigma;                               // denoising strength
      56             :     int patch_size,    patch_hsize;             // patch size and half size
      57             :     int patch_size_uv, patch_hsize_uv;          // patch size and half size for chroma planes
      58             :     int research_size,    research_hsize;       // research size and half size
      59             :     int research_size_uv, research_hsize_uv;    // research size and half size for chroma planes
      60             :     uint32_t *ii_orig;                          // integral image
      61             :     uint32_t *ii;                               // integral image starting after the 0-line and 0-column
      62             :     int ii_w, ii_h;                             // width and height of the integral image
      63             :     int ii_lz_32;                               // linesize in 32-bit units of the integral image
      64             :     struct weighted_avg *wa;                    // weighted average of every pixel
      65             :     int wa_linesize;                            // linesize for wa in struct size unit
      66             :     double weight_lut[WEIGHT_LUT_SIZE];         // lookup table mapping (scaled) patch differences to their associated weights
      67             :     double pdiff_lut_scale;                     // scale factor for patch differences before looking into the LUT
      68             :     int max_meaningful_diff;                    // maximum difference considered (if the patch difference is too high we ignore the pixel)
      69             : } NLMeansContext;
      70             : 
      71             : #define OFFSET(x) offsetof(NLMeansContext, x)
      72             : #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
      73             : static const AVOption nlmeans_options[] = {
      74             :     { "s",  "denoising strength", OFFSET(sigma), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, 1.0, 30.0, FLAGS },
      75             :     { "p",  "patch size",                   OFFSET(patch_size),    AV_OPT_TYPE_INT, { .i64 = 3*2+1 }, 0, 99, FLAGS },
      76             :     { "pc", "patch size for chroma planes", OFFSET(patch_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 },     0, 99, FLAGS },
      77             :     { "r",  "research window",                   OFFSET(research_size),    AV_OPT_TYPE_INT, { .i64 = 7*2+1 }, 0, 99, FLAGS },
      78             :     { "rc", "research window for chroma planes", OFFSET(research_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 },     0, 99, FLAGS },
      79             :     { NULL }
      80             : };
      81             : 
      82             : AVFILTER_DEFINE_CLASS(nlmeans);
      83             : 
      84           0 : static int query_formats(AVFilterContext *ctx)
      85             : {
      86             :     static const enum AVPixelFormat pix_fmts[] = {
      87             :         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
      88             :         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
      89             :         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
      90             :         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
      91             :         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
      92             :         AV_PIX_FMT_YUVJ411P,
      93             :         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP,
      94             :         AV_PIX_FMT_NONE
      95             :     };
      96             : 
      97           0 :     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
      98           0 :     if (!fmts_list)
      99           0 :         return AVERROR(ENOMEM);
     100           0 :     return ff_set_common_formats(ctx, fmts_list);
     101             : }
     102             : 
     103             : /*
     104             :  * M is a discrete map where every entry contains the sum of all the entries
     105             :  * in the rectangle from the top-left origin of M to its coordinate. In the
     106             :  * following schema, "i" contains the sum of the whole map:
     107             :  *
     108             :  * M = +----------+-----------------+----+
     109             :  *     |          |                 |    |
     110             :  *     |          |                 |    |
     111             :  *     |         a|                b|   c|
     112             :  *     +----------+-----------------+----+
     113             :  *     |          |                 |    |
     114             :  *     |          |                 |    |
     115             :  *     |          |        X        |    |
     116             :  *     |          |                 |    |
     117             :  *     |         d|                e|   f|
     118             :  *     +----------+-----------------+----+
     119             :  *     |          |                 |    |
     120             :  *     |         g|                h|   i|
     121             :  *     +----------+-----------------+----+
     122             :  *
     123             :  * The sum of the X box can be calculated with:
     124             :  *    X = e-d-b+a
     125             :  *
     126             :  * See https://en.wikipedia.org/wiki/Summed_area_table
     127             :  *
     128             :  * The compute*_ssd functions compute the integral image M where every entry
     129             :  * contains the sum of the squared difference of every corresponding pixels of
     130             :  * two input planes of the same size as M.
     131             :  */
     132           0 : static inline int get_integral_patch_value(const uint32_t *ii, int ii_lz_32, int x, int y, int p)
     133             : {
     134           0 :     const int e = ii[(y + p    ) * ii_lz_32 + (x + p    )];
     135           0 :     const int d = ii[(y + p    ) * ii_lz_32 + (x - p - 1)];
     136           0 :     const int b = ii[(y - p - 1) * ii_lz_32 + (x + p    )];
     137           0 :     const int a = ii[(y - p - 1) * ii_lz_32 + (x - p - 1)];
     138           0 :     return e - d - b + a;
     139             : }
     140             : 
     141             : /**
     142             :  * Compute squared difference of the safe area (the zone where s1 and s2
     143             :  * overlap). It is likely the largest integral zone, so it is interesting to do
     144             :  * as little checks as possible; contrary to the unsafe version of this
     145             :  * function, we do not need any clipping here.
     146             :  *
     147             :  * The line above dst and the column to its left are always readable.
     148             :  *
     149             :  * This C version computes the SSD integral image using a scalar accumulator,
     150             :  * while for SIMD implementation it is likely more interesting to use the
     151             :  * two-loops algorithm variant.
     152             :  */
     153           0 : static void compute_safe_ssd_integral_image_c(uint32_t *dst, int dst_linesize_32,
     154             :                                               const uint8_t *s1, int linesize1,
     155             :                                               const uint8_t *s2, int linesize2,
     156             :                                               int w, int h)
     157             : {
     158             :     int x, y;
     159             : 
     160           0 :     for (y = 0; y < h; y++) {
     161           0 :         uint32_t acc = dst[-1] - dst[-dst_linesize_32 - 1];
     162             : 
     163           0 :         for (x = 0; x < w; x++) {
     164           0 :             const int d  = s1[x] - s2[x];
     165           0 :             acc += d * d;
     166           0 :             dst[x] = dst[-dst_linesize_32 + x] + acc;
     167             :         }
     168           0 :         s1  += linesize1;
     169           0 :         s2  += linesize2;
     170           0 :         dst += dst_linesize_32;
     171             :     }
     172           0 : }
     173             : 
     174             : /**
     175             :  * Compute squared difference of an unsafe area (the zone nor s1 nor s2 could
     176             :  * be readable).
     177             :  *
     178             :  * On the other hand, the line above dst and the column to its left are always
     179             :  * readable.
     180             :  *
     181             :  * There is little point in having this function SIMDified as it is likely too
     182             :  * complex and only handle small portions of the image.
     183             :  *
     184             :  * @param dst               integral image
     185             :  * @param dst_linesize_32   integral image linesize (in 32-bit integers unit)
     186             :  * @param startx            integral starting x position
     187             :  * @param starty            integral starting y position
     188             :  * @param src               source plane buffer
     189             :  * @param linesize          source plane linesize
     190             :  * @param offx              source offsetting in x
     191             :  * @param offy              source offsetting in y
     192             :  * @paran r                 absolute maximum source offsetting
     193             :  * @param sw                source width
     194             :  * @param sh                source height
     195             :  * @param w                 width to compute
     196             :  * @param h                 height to compute
     197             :  */
     198           0 : static inline void compute_unsafe_ssd_integral_image(uint32_t *dst, int dst_linesize_32,
     199             :                                                      int startx, int starty,
     200             :                                                      const uint8_t *src, int linesize,
     201             :                                                      int offx, int offy, int r, int sw, int sh,
     202             :                                                      int w, int h)
     203             : {
     204             :     int x, y;
     205             : 
     206           0 :     for (y = starty; y < starty + h; y++) {
     207           0 :         uint32_t acc = dst[y*dst_linesize_32 + startx - 1] - dst[(y-1)*dst_linesize_32 + startx - 1];
     208           0 :         const int s1y = av_clip(y -  r,         0, sh - 1);
     209           0 :         const int s2y = av_clip(y - (r + offy), 0, sh - 1);
     210             : 
     211           0 :         for (x = startx; x < startx + w; x++) {
     212           0 :             const int s1x = av_clip(x -  r,         0, sw - 1);
     213           0 :             const int s2x = av_clip(x - (r + offx), 0, sw - 1);
     214           0 :             const uint8_t v1 = src[s1y*linesize + s1x];
     215           0 :             const uint8_t v2 = src[s2y*linesize + s2x];
     216           0 :             const int d = v1 - v2;
     217           0 :             acc += d * d;
     218           0 :             dst[y*dst_linesize_32 + x] = dst[(y-1)*dst_linesize_32 + x] + acc;
     219             :         }
     220             :     }
     221           0 : }
     222             : 
     223             : /*
     224             :  * Compute the sum of squared difference integral image
     225             :  * http://www.ipol.im/pub/art/2014/57/
     226             :  * Integral Images for Block Matching - Gabriele Facciolo, Nicolas Limare, Enric Meinhardt-Llopis
     227             :  *
     228             :  * @param ii                integral image of dimension (w+e*2) x (h+e*2) with
     229             :  *                          an additional zeroed top line and column already
     230             :  *                          "applied" to the pointer value
     231             :  * @param ii_linesize_32    integral image linesize (in 32-bit integers unit)
     232             :  * @param src               source plane buffer
     233             :  * @param linesize          source plane linesize
     234             :  * @param offx              x-offsetting ranging in [-e;e]
     235             :  * @param offy              y-offsetting ranging in [-e;e]
     236             :  * @param w                 source width
     237             :  * @param h                 source height
     238             :  * @param e                 research padding edge
     239             :  */
     240           0 : static void compute_ssd_integral_image(uint32_t *ii, int ii_linesize_32,
     241             :                                        const uint8_t *src, int linesize, int offx, int offy,
     242             :                                        int e, int w, int h)
     243             : {
     244             :     // ii has a surrounding padding of thickness "e"
     245           0 :     const int ii_w = w + e*2;
     246           0 :     const int ii_h = h + e*2;
     247             : 
     248             :     // we center the first source
     249           0 :     const int s1x = e;
     250           0 :     const int s1y = e;
     251             : 
     252             :     // 2nd source is the frame with offsetting
     253           0 :     const int s2x = e + offx;
     254           0 :     const int s2y = e + offy;
     255             : 
     256             :     // get the dimension of the overlapping rectangle where it is always safe
     257             :     // to compare the 2 sources pixels
     258           0 :     const int startx_safe = FFMAX(s1x, s2x);
     259           0 :     const int starty_safe = FFMAX(s1y, s2y);
     260           0 :     const int endx_safe   = FFMIN(s1x + w, s2x + w);
     261           0 :     const int endy_safe   = FFMIN(s1y + h, s2y + h);
     262             : 
     263             :     // top part where only one of s1 and s2 is still readable, or none at all
     264           0 :     compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
     265             :                                       0, 0,
     266             :                                       src, linesize,
     267             :                                       offx, offy, e, w, h,
     268             :                                       ii_w, starty_safe);
     269             : 
     270             :     // fill the left column integral required to compute the central
     271             :     // overlapping one
     272           0 :     compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
     273             :                                       0, starty_safe,
     274             :                                       src, linesize,
     275             :                                       offx, offy, e, w, h,
     276             :                                       startx_safe, endy_safe - starty_safe);
     277             : 
     278             :     // main and safe part of the integral
     279             :     av_assert1(startx_safe - s1x >= 0); av_assert1(startx_safe - s1x < w);
     280             :     av_assert1(starty_safe - s1y >= 0); av_assert1(starty_safe - s1y < h);
     281             :     av_assert1(startx_safe - s2x >= 0); av_assert1(startx_safe - s2x < w);
     282             :     av_assert1(starty_safe - s2y >= 0); av_assert1(starty_safe - s2y < h);
     283           0 :     compute_safe_ssd_integral_image_c(ii + starty_safe*ii_linesize_32 + startx_safe, ii_linesize_32,
     284           0 :                                       src + (starty_safe - s1y) * linesize + (startx_safe - s1x), linesize,
     285           0 :                                       src + (starty_safe - s2y) * linesize + (startx_safe - s2x), linesize,
     286             :                                       endx_safe - startx_safe, endy_safe - starty_safe);
     287             : 
     288             :     // right part of the integral
     289           0 :     compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
     290             :                                       endx_safe, starty_safe,
     291             :                                       src, linesize,
     292             :                                       offx, offy, e, w, h,
     293             :                                       ii_w - endx_safe, endy_safe - starty_safe);
     294             : 
     295             :     // bottom part where only one of s1 and s2 is still readable, or none at all
     296           0 :     compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
     297             :                                       0, endy_safe,
     298             :                                       src, linesize,
     299             :                                       offx, offy, e, w, h,
     300             :                                       ii_w, ii_h - endy_safe);
     301           0 : }
     302             : 
     303           0 : static int config_input(AVFilterLink *inlink)
     304             : {
     305           0 :     AVFilterContext *ctx = inlink->dst;
     306           0 :     NLMeansContext *s = ctx->priv;
     307           0 :     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     308           0 :     const int e = FFMAX(s->research_hsize, s->research_hsize_uv)
     309           0 :                 + FFMAX(s->patch_hsize,    s->patch_hsize_uv);
     310             : 
     311           0 :     s->chroma_w = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
     312           0 :     s->chroma_h = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
     313           0 :     s->nb_planes = av_pix_fmt_count_planes(inlink->format);
     314             : 
     315             :     /* Allocate the integral image with extra edges of thickness "e"
     316             :      *
     317             :      *   +_+-------------------------------+
     318             :      *   |0|0000000000000000000000000000000|
     319             :      *   +-x-------------------------------+
     320             :      *   |0|\    ^                         |
     321             :      *   |0| ii  | e                       |
     322             :      *   |0|     v                         |
     323             :      *   |0|   +-----------------------+   |
     324             :      *   |0|   |                       |   |
     325             :      *   |0|<->|                       |   |
     326             :      *   |0| e |                       |   |
     327             :      *   |0|   |                       |   |
     328             :      *   |0|   +-----------------------+   |
     329             :      *   |0|                               |
     330             :      *   |0|                               |
     331             :      *   |0|                               |
     332             :      *   +-+-------------------------------+
     333             :      */
     334           0 :     s->ii_w = inlink->w + e*2;
     335           0 :     s->ii_h = inlink->h + e*2;
     336             : 
     337             :     // align to 4 the linesize, "+1" is for the space of the left 0-column
     338           0 :     s->ii_lz_32 = FFALIGN(s->ii_w + 1, 4);
     339             : 
     340             :     // "+1" is for the space of the top 0-line
     341           0 :     s->ii_orig = av_mallocz_array(s->ii_h + 1, s->ii_lz_32 * sizeof(*s->ii_orig));
     342           0 :     if (!s->ii_orig)
     343           0 :         return AVERROR(ENOMEM);
     344             : 
     345             :     // skip top 0-line and left 0-column
     346           0 :     s->ii = s->ii_orig + s->ii_lz_32 + 1;
     347             : 
     348             :     // allocate weighted average for every pixel
     349           0 :     s->wa_linesize = inlink->w;
     350           0 :     s->wa = av_malloc_array(s->wa_linesize, inlink->h * sizeof(*s->wa));
     351           0 :     if (!s->wa)
     352           0 :         return AVERROR(ENOMEM);
     353             : 
     354           0 :     return 0;
     355             : }
     356             : 
     357             : struct thread_data {
     358             :     const uint8_t *src;
     359             :     int src_linesize;
     360             :     int startx, starty;
     361             :     int endx, endy;
     362             :     const uint32_t *ii_start;
     363             :     int p;
     364             : };
     365             : 
     366           0 : static int nlmeans_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
     367             : {
     368             :     int x, y;
     369           0 :     NLMeansContext *s = ctx->priv;
     370           0 :     const struct thread_data *td = arg;
     371           0 :     const uint8_t *src = td->src;
     372           0 :     const int src_linesize = td->src_linesize;
     373           0 :     const int process_h = td->endy - td->starty;
     374           0 :     const int slice_start = (process_h *  jobnr   ) / nb_jobs;
     375           0 :     const int slice_end   = (process_h * (jobnr+1)) / nb_jobs;
     376           0 :     const int starty = td->starty + slice_start;
     377           0 :     const int endy   = td->starty + slice_end;
     378             : 
     379           0 :     for (y = starty; y < endy; y++) {
     380           0 :         for (x = td->startx; x < td->endx; x++) {
     381           0 :             const int patch_diff_sq = get_integral_patch_value(td->ii_start, s->ii_lz_32, x, y, td->p);
     382           0 :             if (patch_diff_sq < s->max_meaningful_diff) {
     383           0 :                 struct weighted_avg *wa = &s->wa[y*s->wa_linesize + x];
     384           0 :                 const int weight_lut_idx = patch_diff_sq * s->pdiff_lut_scale;
     385           0 :                 const double weight = s->weight_lut[weight_lut_idx]; // exp(-patch_diff_sq * s->pdiff_scale)
     386           0 :                 wa->total_weight += weight;
     387           0 :                 wa->sum += weight * src[y*src_linesize + x];
     388             :             }
     389             :         }
     390             :     }
     391           0 :     return 0;
     392             : }
     393             : 
     394           0 : static int nlmeans_plane(AVFilterContext *ctx, int w, int h, int p, int r,
     395             :                          uint8_t *dst, int dst_linesize,
     396             :                          const uint8_t *src, int src_linesize)
     397             : {
     398             :     int x, y;
     399             :     int offx, offy;
     400           0 :     NLMeansContext *s = ctx->priv;
     401             :     /* patches center points cover the whole research window so the patches
     402             :      * themselves overflow the research window */
     403           0 :     const int e = r + p;
     404             :     /* focus an integral pointer on the centered image (s1) */
     405           0 :     const uint32_t *centered_ii = s->ii + e*s->ii_lz_32 + e;
     406             : 
     407           0 :     memset(s->wa, 0, s->wa_linesize * h * sizeof(*s->wa));
     408             : 
     409           0 :     for (offy = -r; offy <= r; offy++) {
     410           0 :         for (offx = -r; offx <= r; offx++) {
     411           0 :             if (offx || offy) {
     412           0 :                 struct thread_data td = {
     413           0 :                     .src          = src + offy*src_linesize + offx,
     414             :                     .src_linesize = src_linesize,
     415           0 :                     .startx       = FFMAX(0, -offx),
     416           0 :                     .starty       = FFMAX(0, -offy),
     417           0 :                     .endx         = FFMIN(w, w - offx),
     418           0 :                     .endy         = FFMIN(h, h - offy),
     419           0 :                     .ii_start     = centered_ii + offy*s->ii_lz_32 + offx,
     420             :                     .p            = p,
     421             :                 };
     422             : 
     423           0 :                 compute_ssd_integral_image(s->ii, s->ii_lz_32,
     424             :                                            src, src_linesize,
     425             :                                            offx, offy, e, w, h);
     426           0 :                 ctx->internal->execute(ctx, nlmeans_slice, &td, NULL,
     427           0 :                                        FFMIN(td.endy - td.starty, ff_filter_get_nb_threads(ctx)));
     428             :             }
     429             :         }
     430             :     }
     431           0 :     for (y = 0; y < h; y++) {
     432           0 :         for (x = 0; x < w; x++) {
     433           0 :             struct weighted_avg *wa = &s->wa[y*s->wa_linesize + x];
     434             : 
     435             :             // Also weight the centered pixel
     436           0 :             wa->total_weight += 1.0;
     437           0 :             wa->sum += 1.0 * src[y*src_linesize + x];
     438             : 
     439           0 :             dst[y*dst_linesize + x] = av_clip_uint8(wa->sum / wa->total_weight);
     440             :         }
     441             :     }
     442           0 :     return 0;
     443             : }
     444             : 
     445           0 : static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     446             : {
     447             :     int i;
     448           0 :     AVFilterContext *ctx = inlink->dst;
     449           0 :     NLMeansContext *s = ctx->priv;
     450           0 :     AVFilterLink *outlink = ctx->outputs[0];
     451             : 
     452           0 :     AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     453           0 :     if (!out) {
     454           0 :         av_frame_free(&in);
     455           0 :         return AVERROR(ENOMEM);
     456             :     }
     457           0 :     av_frame_copy_props(out, in);
     458             : 
     459           0 :     for (i = 0; i < s->nb_planes; i++) {
     460           0 :         const int w = i ? s->chroma_w          : inlink->w;
     461           0 :         const int h = i ? s->chroma_h          : inlink->h;
     462           0 :         const int p = i ? s->patch_hsize_uv    : s->patch_hsize;
     463           0 :         const int r = i ? s->research_hsize_uv : s->research_hsize;
     464           0 :         nlmeans_plane(ctx, w, h, p, r,
     465             :                       out->data[i], out->linesize[i],
     466           0 :                       in->data[i],  in->linesize[i]);
     467             :     }
     468             : 
     469           0 :     av_frame_free(&in);
     470           0 :     return ff_filter_frame(outlink, out);
     471             : }
     472             : 
     473             : #define CHECK_ODD_FIELD(field, name) do {                       \
     474             :     if (!(s->field & 1)) {                                      \
     475             :         s->field |= 1;                                          \
     476             :         av_log(ctx, AV_LOG_WARNING, name " size must be odd, "  \
     477             :                "setting it to %d\n", s->field);                 \
     478             :     }                                                           \
     479             : } while (0)
     480             : 
     481           0 : static av_cold int init(AVFilterContext *ctx)
     482             : {
     483             :     int i;
     484           0 :     NLMeansContext *s = ctx->priv;
     485           0 :     const double h = s->sigma * 10.;
     486             : 
     487           0 :     s->pdiff_scale = 1. / (h * h);
     488           0 :     s->max_meaningful_diff = -log(1/255.) / s->pdiff_scale;
     489           0 :     s->pdiff_lut_scale = 1./s->max_meaningful_diff * WEIGHT_LUT_SIZE;
     490           0 :     av_assert0((s->max_meaningful_diff - 1) * s->pdiff_lut_scale < FF_ARRAY_ELEMS(s->weight_lut));
     491           0 :     for (i = 0; i < WEIGHT_LUT_SIZE; i++)
     492           0 :         s->weight_lut[i] = exp(-i / s->pdiff_lut_scale * s->pdiff_scale);
     493             : 
     494           0 :     CHECK_ODD_FIELD(research_size,   "Luma research window");
     495           0 :     CHECK_ODD_FIELD(patch_size,      "Luma patch");
     496             : 
     497           0 :     if (!s->research_size_uv) s->research_size_uv = s->research_size;
     498           0 :     if (!s->patch_size_uv)    s->patch_size_uv    = s->patch_size;
     499             : 
     500           0 :     CHECK_ODD_FIELD(research_size_uv, "Chroma research window");
     501           0 :     CHECK_ODD_FIELD(patch_size_uv,    "Chroma patch");
     502             : 
     503           0 :     s->research_hsize    = s->research_size    / 2;
     504           0 :     s->research_hsize_uv = s->research_size_uv / 2;
     505           0 :     s->patch_hsize       = s->patch_size       / 2;
     506           0 :     s->patch_hsize_uv    = s->patch_size_uv    / 2;
     507             : 
     508           0 :     av_log(ctx, AV_LOG_INFO, "Research window: %dx%d / %dx%d, patch size: %dx%d / %dx%d\n",
     509             :            s->research_size, s->research_size, s->research_size_uv, s->research_size_uv,
     510             :            s->patch_size,    s->patch_size,    s->patch_size_uv,    s->patch_size_uv);
     511             : 
     512           0 :     return 0;
     513             : }
     514             : 
     515           0 : static av_cold void uninit(AVFilterContext *ctx)
     516             : {
     517           0 :     NLMeansContext *s = ctx->priv;
     518           0 :     av_freep(&s->ii_orig);
     519           0 :     av_freep(&s->wa);
     520           0 : }
     521             : 
     522             : static const AVFilterPad nlmeans_inputs[] = {
     523             :     {
     524             :         .name         = "default",
     525             :         .type         = AVMEDIA_TYPE_VIDEO,
     526             :         .config_props = config_input,
     527             :         .filter_frame = filter_frame,
     528             :     },
     529             :     { NULL }
     530             : };
     531             : 
     532             : static const AVFilterPad nlmeans_outputs[] = {
     533             :     {
     534             :         .name = "default",
     535             :         .type = AVMEDIA_TYPE_VIDEO,
     536             :     },
     537             :     { NULL }
     538             : };
     539             : 
     540             : AVFilter ff_vf_nlmeans = {
     541             :     .name          = "nlmeans",
     542             :     .description   = NULL_IF_CONFIG_SMALL("Non-local means denoiser."),
     543             :     .priv_size     = sizeof(NLMeansContext),
     544             :     .init          = init,
     545             :     .uninit        = uninit,
     546             :     .query_formats = query_formats,
     547             :     .inputs        = nlmeans_inputs,
     548             :     .outputs       = nlmeans_outputs,
     549             :     .priv_class    = &nlmeans_class,
     550             :     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
     551             : };

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