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https://github.com/jellyfin/jellyfin-ffmpeg.git
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486 lines
20 KiB
C
486 lines
20 KiB
C
/*
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* Copyright (c) 2016 Clément Bœsch <u pkh me>
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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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/**
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* @todo
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* - better automatic defaults? see "Parameters" @ http://www.ipol.im/pub/art/2011/bcm_nlm/
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* - temporal support (probably doesn't need any displacement according to
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* "Denoising image sequences does not require motion estimation")
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* - Bayer pixel format support for at least raw photos? (DNG support would be
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* handy here)
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* - FATE test (probably needs visual threshold test mechanism due to the use
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* of floats)
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*/
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#include "libavutil/avassert.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 "internal.h"
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#include "vf_nlmeans.h"
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#include "vf_nlmeans_init.h"
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#include "video.h"
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typedef struct NLMeansContext {
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const AVClass *class;
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int nb_planes;
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int chroma_w, chroma_h;
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double pdiff_scale; // invert of the filtering parameter (sigma*10) squared
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double sigma; // denoising strength
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int patch_size, patch_hsize; // patch size and half size
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int patch_size_uv, patch_hsize_uv; // patch size and half size for chroma planes
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int research_size, research_hsize; // research size and half size
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int research_size_uv, research_hsize_uv; // research size and half size for chroma planes
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uint32_t *ii_orig; // integral image
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uint32_t *ii; // integral image starting after the 0-line and 0-column
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int ii_w, ii_h; // width and height of the integral image
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ptrdiff_t ii_lz_32; // linesize in 32-bit units of the integral image
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float *total_weight; // total weight for every pixel
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float *sum; // weighted sum for every pixel
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int linesize; // sum and total_weight linesize
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float *weight_lut; // lookup table mapping (scaled) patch differences to their associated weights
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uint32_t max_meaningful_diff; // maximum difference considered (if the patch difference is too high we ignore the pixel)
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NLMeansDSPContext dsp;
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} NLMeansContext;
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#define OFFSET(x) offsetof(NLMeansContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption nlmeans_options[] = {
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{ "s", "denoising strength", OFFSET(sigma), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, 1.0, 30.0, FLAGS },
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{ "p", "patch size", OFFSET(patch_size), AV_OPT_TYPE_INT, { .i64 = 3*2+1 }, 0, 99, FLAGS },
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{ "pc", "patch size for chroma planes", OFFSET(patch_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 99, FLAGS },
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{ "r", "research window", OFFSET(research_size), AV_OPT_TYPE_INT, { .i64 = 7*2+1 }, 0, 99, FLAGS },
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{ "rc", "research window for chroma planes", OFFSET(research_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 99, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(nlmeans);
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUVJ411P,
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP,
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AV_PIX_FMT_NONE
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};
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/**
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* Compute squared difference of an unsafe area (the zone nor s1 nor s2 could
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* be readable).
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*
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* On the other hand, the line above dst and the column to its left are always
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* readable.
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*
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* There is little point in having this function SIMDified as it is likely too
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* complex and only handle small portions of the image.
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*
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* @param dst integral image
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* @param dst_linesize_32 integral image linesize (in 32-bit integers unit)
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* @param startx integral starting x position
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* @param starty integral starting y position
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* @param src source plane buffer
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* @param linesize source plane linesize
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* @param offx source offsetting in x
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* @param offy source offsetting in y
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* @paran r absolute maximum source offsetting
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* @param sw source width
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* @param sh source height
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* @param w width to compute
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* @param h height to compute
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*/
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static inline void compute_unsafe_ssd_integral_image(uint32_t *dst, ptrdiff_t dst_linesize_32,
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int startx, int starty,
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const uint8_t *src, ptrdiff_t linesize,
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int offx, int offy, int r, int sw, int sh,
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int w, int h)
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{
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for (int y = starty; y < starty + h; y++) {
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uint32_t acc = dst[y*dst_linesize_32 + startx - 1] - dst[(y-1)*dst_linesize_32 + startx - 1];
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const int s1y = av_clip(y - r, 0, sh - 1);
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const int s2y = av_clip(y - (r + offy), 0, sh - 1);
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for (int x = startx; x < startx + w; x++) {
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const int s1x = av_clip(x - r, 0, sw - 1);
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const int s2x = av_clip(x - (r + offx), 0, sw - 1);
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const uint8_t v1 = src[s1y*linesize + s1x];
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const uint8_t v2 = src[s2y*linesize + s2x];
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const int d = v1 - v2;
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acc += d * d;
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dst[y*dst_linesize_32 + x] = dst[(y-1)*dst_linesize_32 + x] + acc;
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}
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}
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}
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/*
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* Compute the sum of squared difference integral image
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* http://www.ipol.im/pub/art/2014/57/
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* Integral Images for Block Matching - Gabriele Facciolo, Nicolas Limare, Enric Meinhardt-Llopis
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*
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* @param ii integral image of dimension (w+e*2) x (h+e*2) with
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* an additional zeroed top line and column already
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* "applied" to the pointer value
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* @param ii_linesize_32 integral image linesize (in 32-bit integers unit)
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* @param src source plane buffer
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* @param linesize source plane linesize
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* @param offx x-offsetting ranging in [-e;e]
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* @param offy y-offsetting ranging in [-e;e]
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* @param w source width
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* @param h source height
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* @param e research padding edge
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*/
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static void compute_ssd_integral_image(const NLMeansDSPContext *dsp,
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uint32_t *ii, ptrdiff_t ii_linesize_32,
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const uint8_t *src, ptrdiff_t linesize, int offx, int offy,
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int e, int w, int h)
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{
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// ii has a surrounding padding of thickness "e"
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const int ii_w = w + e*2;
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const int ii_h = h + e*2;
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// we center the first source
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const int s1x = e;
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const int s1y = e;
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// 2nd source is the frame with offsetting
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const int s2x = e + offx;
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const int s2y = e + offy;
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// get the dimension of the overlapping rectangle where it is always safe
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// to compare the 2 sources pixels
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const int startx_safe = FFMAX(s1x, s2x);
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const int starty_safe = FFMAX(s1y, s2y);
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const int u_endx_safe = FFMIN(s1x + w, s2x + w); // unaligned
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const int endy_safe = FFMIN(s1y + h, s2y + h);
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// deduce the safe area width and height
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const int safe_pw = (u_endx_safe - startx_safe) & ~0xf;
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const int safe_ph = endy_safe - starty_safe;
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// adjusted end x position of the safe area after width of the safe area gets aligned
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const int endx_safe = startx_safe + safe_pw;
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// top part where only one of s1 and s2 is still readable, or none at all
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compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
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0, 0,
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src, linesize,
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offx, offy, e, w, h,
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ii_w, starty_safe);
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// fill the left column integral required to compute the central
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// overlapping one
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compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
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0, starty_safe,
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src, linesize,
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offx, offy, e, w, h,
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startx_safe, safe_ph);
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// main and safe part of the integral
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av_assert1(startx_safe - s1x >= 0); av_assert1(startx_safe - s1x < w);
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av_assert1(starty_safe - s1y >= 0); av_assert1(starty_safe - s1y < h);
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av_assert1(startx_safe - s2x >= 0); av_assert1(startx_safe - s2x < w);
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av_assert1(starty_safe - s2y >= 0); av_assert1(starty_safe - s2y < h);
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if (safe_pw && safe_ph)
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dsp->compute_safe_ssd_integral_image(ii + starty_safe*ii_linesize_32 + startx_safe, ii_linesize_32,
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src + (starty_safe - s1y) * linesize + (startx_safe - s1x), linesize,
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src + (starty_safe - s2y) * linesize + (startx_safe - s2x), linesize,
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safe_pw, safe_ph);
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// right part of the integral
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compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
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endx_safe, starty_safe,
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src, linesize,
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offx, offy, e, w, h,
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ii_w - endx_safe, safe_ph);
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// bottom part where only one of s1 and s2 is still readable, or none at all
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compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
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0, endy_safe,
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src, linesize,
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offx, offy, e, w, h,
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ii_w, ii_h - endy_safe);
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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NLMeansContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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const int e = FFMAX(s->research_hsize, s->research_hsize_uv)
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+ FFMAX(s->patch_hsize, s->patch_hsize_uv);
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s->chroma_w = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
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s->chroma_h = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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/* Allocate the integral image with extra edges of thickness "e"
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*
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* +_+-------------------------------+
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* |0|0000000000000000000000000000000|
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* +-x-------------------------------+
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* |0|\ ^ |
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* |0| ii | e |
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* |0| v |
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* |0| +-----------------------+ |
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* |0| | | |
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* |0|<->| | |
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* |0| e | | |
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* |0| | | |
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* |0| +-----------------------+ |
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* |0| |
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* |0| |
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* |0| |
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* +-+-------------------------------+
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*/
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s->ii_w = inlink->w + e*2;
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s->ii_h = inlink->h + e*2;
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// align to 4 the linesize, "+1" is for the space of the left 0-column
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s->ii_lz_32 = FFALIGN(s->ii_w + 1, 4);
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// "+1" is for the space of the top 0-line
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s->ii_orig = av_calloc(s->ii_h + 1, s->ii_lz_32 * sizeof(*s->ii_orig));
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if (!s->ii_orig)
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return AVERROR(ENOMEM);
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// skip top 0-line and left 0-column
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s->ii = s->ii_orig + s->ii_lz_32 + 1;
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// allocate weighted average for every pixel
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s->linesize = inlink->w + 100;
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s->total_weight = av_malloc_array(s->linesize, inlink->h * sizeof(*s->total_weight));
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s->sum = av_malloc_array(s->linesize, inlink->h * sizeof(*s->sum));
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if (!s->total_weight || !s->sum)
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return AVERROR(ENOMEM);
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return 0;
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}
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struct thread_data {
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const uint8_t *src;
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ptrdiff_t src_linesize;
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int startx, starty;
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int endx, endy;
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const uint32_t *ii_start;
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int p;
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};
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static int nlmeans_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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NLMeansContext *s = ctx->priv;
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const uint32_t max_meaningful_diff = s->max_meaningful_diff;
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const struct thread_data *td = arg;
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const ptrdiff_t src_linesize = td->src_linesize;
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const int process_h = td->endy - td->starty;
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const int slice_start = (process_h * jobnr ) / nb_jobs;
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const int slice_end = (process_h * (jobnr+1)) / nb_jobs;
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const int starty = td->starty + slice_start;
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const int endy = td->starty + slice_end;
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const int p = td->p;
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const uint32_t *ii = td->ii_start + (starty - p - 1) * s->ii_lz_32 - p - 1;
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const int dist_b = 2*p + 1;
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const int dist_d = dist_b * s->ii_lz_32;
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const int dist_e = dist_d + dist_b;
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const float *const weight_lut = s->weight_lut;
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NLMeansDSPContext *dsp = &s->dsp;
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for (int y = starty; y < endy; y++) {
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const uint8_t *const src = td->src + y*src_linesize;
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float *total_weight = s->total_weight + y*s->linesize;
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float *sum = s->sum + y*s->linesize;
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const uint32_t *const iia = ii;
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const uint32_t *const iib = ii + dist_b;
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const uint32_t *const iid = ii + dist_d;
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const uint32_t *const iie = ii + dist_e;
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dsp->compute_weights_line(iia, iib, iid, iie, src, total_weight, sum,
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weight_lut, max_meaningful_diff,
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td->startx, td->endx);
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ii += s->ii_lz_32;
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}
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return 0;
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}
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static void weight_averages(uint8_t *dst, ptrdiff_t dst_linesize,
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const uint8_t *src, ptrdiff_t src_linesize,
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float *total_weight, float *sum, ptrdiff_t linesize,
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int w, int h)
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{
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for (int y = 0; y < h; y++) {
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for (int x = 0; x < w; x++) {
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// Also weight the centered pixel
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total_weight[x] += 1.f;
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sum[x] += 1.f * src[x];
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dst[x] = av_clip_uint8(sum[x] / total_weight[x] + 0.5f);
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}
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dst += dst_linesize;
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src += src_linesize;
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total_weight += linesize;
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sum += linesize;
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}
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}
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static int nlmeans_plane(AVFilterContext *ctx, int w, int h, int p, int r,
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uint8_t *dst, ptrdiff_t dst_linesize,
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const uint8_t *src, ptrdiff_t src_linesize)
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{
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NLMeansContext *s = ctx->priv;
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/* patches center points cover the whole research window so the patches
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* themselves overflow the research window */
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const int e = r + p;
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/* focus an integral pointer on the centered image (s1) */
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const uint32_t *centered_ii = s->ii + e*s->ii_lz_32 + e;
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memset(s->total_weight, 0, s->linesize * h * sizeof(*s->total_weight));
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memset(s->sum, 0, s->linesize * h * sizeof(*s->sum));
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for (int offy = -r; offy <= r; offy++) {
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for (int offx = -r; offx <= r; offx++) {
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if (offx || offy) {
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struct thread_data td = {
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.src = src + offy*src_linesize + offx,
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.src_linesize = src_linesize,
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.startx = FFMAX(0, -offx),
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.starty = FFMAX(0, -offy),
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.endx = FFMIN(w, w - offx),
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.endy = FFMIN(h, h - offy),
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.ii_start = centered_ii + offy*s->ii_lz_32 + offx,
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.p = p,
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};
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compute_ssd_integral_image(&s->dsp, s->ii, s->ii_lz_32,
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src, src_linesize,
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offx, offy, e, w, h);
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ff_filter_execute(ctx, nlmeans_slice, &td, NULL,
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FFMIN(td.endy - td.starty, ff_filter_get_nb_threads(ctx)));
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}
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}
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}
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weight_averages(dst, dst_linesize, src, src_linesize,
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s->total_weight, s->sum, s->linesize, w, h);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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NLMeansContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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for (int i = 0; i < s->nb_planes; i++) {
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const int w = i ? s->chroma_w : inlink->w;
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const int h = i ? s->chroma_h : inlink->h;
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const int p = i ? s->patch_hsize_uv : s->patch_hsize;
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const int r = i ? s->research_hsize_uv : s->research_hsize;
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nlmeans_plane(ctx, w, h, p, r,
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out->data[i], out->linesize[i],
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in->data[i], in->linesize[i]);
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}
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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#define CHECK_ODD_FIELD(field, name) do { \
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if (!(s->field & 1)) { \
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s->field |= 1; \
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av_log(ctx, AV_LOG_WARNING, name " size must be odd, " \
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"setting it to %d\n", s->field); \
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} \
|
|
} while (0)
|
|
|
|
static av_cold int init(AVFilterContext *ctx)
|
|
{
|
|
NLMeansContext *s = ctx->priv;
|
|
const double h = s->sigma * 10.;
|
|
|
|
s->pdiff_scale = 1. / (h * h);
|
|
s->max_meaningful_diff = log(255.) / s->pdiff_scale;
|
|
s->weight_lut = av_calloc(s->max_meaningful_diff + 1, sizeof(*s->weight_lut));
|
|
if (!s->weight_lut)
|
|
return AVERROR(ENOMEM);
|
|
for (int i = 0; i < s->max_meaningful_diff; i++)
|
|
s->weight_lut[i] = exp(-i * s->pdiff_scale);
|
|
|
|
CHECK_ODD_FIELD(research_size, "Luma research window");
|
|
CHECK_ODD_FIELD(patch_size, "Luma patch");
|
|
|
|
if (!s->research_size_uv) s->research_size_uv = s->research_size;
|
|
if (!s->patch_size_uv) s->patch_size_uv = s->patch_size;
|
|
|
|
CHECK_ODD_FIELD(research_size_uv, "Chroma research window");
|
|
CHECK_ODD_FIELD(patch_size_uv, "Chroma patch");
|
|
|
|
s->research_hsize = s->research_size / 2;
|
|
s->research_hsize_uv = s->research_size_uv / 2;
|
|
s->patch_hsize = s->patch_size / 2;
|
|
s->patch_hsize_uv = s->patch_size_uv / 2;
|
|
|
|
av_log(ctx, AV_LOG_DEBUG, "Research window: %dx%d / %dx%d, patch size: %dx%d / %dx%d\n",
|
|
s->research_size, s->research_size, s->research_size_uv, s->research_size_uv,
|
|
s->patch_size, s->patch_size, s->patch_size_uv, s->patch_size_uv);
|
|
|
|
ff_nlmeans_init(&s->dsp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
NLMeansContext *s = ctx->priv;
|
|
av_freep(&s->weight_lut);
|
|
av_freep(&s->ii_orig);
|
|
av_freep(&s->total_weight);
|
|
av_freep(&s->sum);
|
|
}
|
|
|
|
static const AVFilterPad nlmeans_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
};
|
|
|
|
const AVFilter ff_vf_nlmeans = {
|
|
.name = "nlmeans",
|
|
.description = NULL_IF_CONFIG_SMALL("Non-local means denoiser."),
|
|
.priv_size = sizeof(NLMeansContext),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
FILTER_INPUTS(nlmeans_inputs),
|
|
FILTER_OUTPUTS(ff_video_default_filterpad),
|
|
FILTER_PIXFMTS_ARRAY(pix_fmts),
|
|
.priv_class = &nlmeans_class,
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
|
|
};
|