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FFmpeg/libavfilter/vf_nlmeans.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

487 lines
20 KiB
C

/*
* Copyright (c) 2016 Clément Bœsch <u pkh me>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @todo
* - better automatic defaults? see "Parameters" @ http://www.ipol.im/pub/art/2011/bcm_nlm/
* - temporal support (probably doesn't need any displacement according to
* "Denoising image sequences does not require motion estimation")
* - Bayer pixel format support for at least raw photos? (DNG support would be
* handy here)
* - FATE test (probably needs visual threshold test mechanism due to the use
* of floats)
*/
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
#include "vf_nlmeans.h"
#include "vf_nlmeans_init.h"
#include "video.h"
typedef struct NLMeansContext {
const AVClass *class;
int nb_planes;
int chroma_w, chroma_h;
double pdiff_scale; // invert of the filtering parameter (sigma*10) squared
double sigma; // denoising strength
int patch_size, patch_hsize; // patch size and half size
int patch_size_uv, patch_hsize_uv; // patch size and half size for chroma planes
int research_size, research_hsize; // research size and half size
int research_size_uv, research_hsize_uv; // research size and half size for chroma planes
uint32_t *ii_orig; // integral image
uint32_t *ii; // integral image starting after the 0-line and 0-column
int ii_w, ii_h; // width and height of the integral image
ptrdiff_t ii_lz_32; // linesize in 32-bit units of the integral image
float *total_weight; // total weight for every pixel
float *sum; // weighted sum for every pixel
int linesize; // sum and total_weight linesize
float *weight_lut; // lookup table mapping (scaled) patch differences to their associated weights
uint32_t max_meaningful_diff; // maximum difference considered (if the patch difference is too high we ignore the pixel)
NLMeansDSPContext dsp;
} NLMeansContext;
#define OFFSET(x) offsetof(NLMeansContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption nlmeans_options[] = {
{ "s", "denoising strength", OFFSET(sigma), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, 1.0, 30.0, FLAGS },
{ "p", "patch size", OFFSET(patch_size), AV_OPT_TYPE_INT, { .i64 = 3*2+1 }, 0, 99, FLAGS },
{ "pc", "patch size for chroma planes", OFFSET(patch_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 99, FLAGS },
{ "r", "research window", OFFSET(research_size), AV_OPT_TYPE_INT, { .i64 = 7*2+1 }, 0, 99, FLAGS },
{ "rc", "research window for chroma planes", OFFSET(research_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 99, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(nlmeans);
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP,
AV_PIX_FMT_NONE
};
/**
* Compute squared difference of an unsafe area (the zone nor s1 nor s2 could
* be readable).
*
* On the other hand, the line above dst and the column to its left are always
* readable.
*
* There is little point in having this function SIMDified as it is likely too
* complex and only handle small portions of the image.
*
* @param dst integral image
* @param dst_linesize_32 integral image linesize (in 32-bit integers unit)
* @param startx integral starting x position
* @param starty integral starting y position
* @param src source plane buffer
* @param linesize source plane linesize
* @param offx source offsetting in x
* @param offy source offsetting in y
* @paran r absolute maximum source offsetting
* @param sw source width
* @param sh source height
* @param w width to compute
* @param h height to compute
*/
static inline void compute_unsafe_ssd_integral_image(uint32_t *dst, ptrdiff_t dst_linesize_32,
int startx, int starty,
const uint8_t *src, ptrdiff_t linesize,
int offx, int offy, int r, int sw, int sh,
int w, int h)
{
for (int y = starty; y < starty + h; y++) {
uint32_t acc = dst[y*dst_linesize_32 + startx - 1] - dst[(y-1)*dst_linesize_32 + startx - 1];
const int s1y = av_clip(y - r, 0, sh - 1);
const int s2y = av_clip(y - (r + offy), 0, sh - 1);
for (int x = startx; x < startx + w; x++) {
const int s1x = av_clip(x - r, 0, sw - 1);
const int s2x = av_clip(x - (r + offx), 0, sw - 1);
const uint8_t v1 = src[s1y*linesize + s1x];
const uint8_t v2 = src[s2y*linesize + s2x];
const int d = v1 - v2;
acc += d * d;
dst[y*dst_linesize_32 + x] = dst[(y-1)*dst_linesize_32 + x] + acc;
}
}
}
/*
* Compute the sum of squared difference integral image
* http://www.ipol.im/pub/art/2014/57/
* Integral Images for Block Matching - Gabriele Facciolo, Nicolas Limare, Enric Meinhardt-Llopis
*
* @param ii integral image of dimension (w+e*2) x (h+e*2) with
* an additional zeroed top line and column already
* "applied" to the pointer value
* @param ii_linesize_32 integral image linesize (in 32-bit integers unit)
* @param src source plane buffer
* @param linesize source plane linesize
* @param offx x-offsetting ranging in [-e;e]
* @param offy y-offsetting ranging in [-e;e]
* @param w source width
* @param h source height
* @param e research padding edge
*/
static void compute_ssd_integral_image(const NLMeansDSPContext *dsp,
uint32_t *ii, ptrdiff_t ii_linesize_32,
const uint8_t *src, ptrdiff_t linesize, int offx, int offy,
int e, int w, int h)
{
// ii has a surrounding padding of thickness "e"
const int ii_w = w + e*2;
const int ii_h = h + e*2;
// we center the first source
const int s1x = e;
const int s1y = e;
// 2nd source is the frame with offsetting
const int s2x = e + offx;
const int s2y = e + offy;
// get the dimension of the overlapping rectangle where it is always safe
// to compare the 2 sources pixels
const int startx_safe = FFMAX(s1x, s2x);
const int starty_safe = FFMAX(s1y, s2y);
const int u_endx_safe = FFMIN(s1x + w, s2x + w); // unaligned
const int endy_safe = FFMIN(s1y + h, s2y + h);
// deduce the safe area width and height
const int safe_pw = (u_endx_safe - startx_safe) & ~0xf;
const int safe_ph = endy_safe - starty_safe;
// adjusted end x position of the safe area after width of the safe area gets aligned
const int endx_safe = startx_safe + safe_pw;
// top part where only one of s1 and s2 is still readable, or none at all
compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
0, 0,
src, linesize,
offx, offy, e, w, h,
ii_w, starty_safe);
// fill the left column integral required to compute the central
// overlapping one
compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
0, starty_safe,
src, linesize,
offx, offy, e, w, h,
startx_safe, safe_ph);
// main and safe part of the integral
av_assert1(startx_safe - s1x >= 0); av_assert1(startx_safe - s1x < w);
av_assert1(starty_safe - s1y >= 0); av_assert1(starty_safe - s1y < h);
av_assert1(startx_safe - s2x >= 0); av_assert1(startx_safe - s2x < w);
av_assert1(starty_safe - s2y >= 0); av_assert1(starty_safe - s2y < h);
if (safe_pw && safe_ph)
dsp->compute_safe_ssd_integral_image(ii + starty_safe*ii_linesize_32 + startx_safe, ii_linesize_32,
src + (starty_safe - s1y) * linesize + (startx_safe - s1x), linesize,
src + (starty_safe - s2y) * linesize + (startx_safe - s2x), linesize,
safe_pw, safe_ph);
// right part of the integral
compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
endx_safe, starty_safe,
src, linesize,
offx, offy, e, w, h,
ii_w - endx_safe, safe_ph);
// bottom part where only one of s1 and s2 is still readable, or none at all
compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
0, endy_safe,
src, linesize,
offx, offy, e, w, h,
ii_w, ii_h - endy_safe);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
NLMeansContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const int e = FFMAX(s->research_hsize, s->research_hsize_uv)
+ FFMAX(s->patch_hsize, s->patch_hsize_uv);
s->chroma_w = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
s->chroma_h = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
/* Allocate the integral image with extra edges of thickness "e"
*
* +_+-------------------------------+
* |0|0000000000000000000000000000000|
* +-x-------------------------------+
* |0|\ ^ |
* |0| ii | e |
* |0| v |
* |0| +-----------------------+ |
* |0| | | |
* |0|<->| | |
* |0| e | | |
* |0| | | |
* |0| +-----------------------+ |
* |0| |
* |0| |
* |0| |
* +-+-------------------------------+
*/
s->ii_w = inlink->w + e*2;
s->ii_h = inlink->h + e*2;
// align to 4 the linesize, "+1" is for the space of the left 0-column
s->ii_lz_32 = FFALIGN(s->ii_w + 1, 4);
// "+1" is for the space of the top 0-line
s->ii_orig = av_calloc(s->ii_h + 1, s->ii_lz_32 * sizeof(*s->ii_orig));
if (!s->ii_orig)
return AVERROR(ENOMEM);
// skip top 0-line and left 0-column
s->ii = s->ii_orig + s->ii_lz_32 + 1;
// allocate weighted average for every pixel
s->linesize = inlink->w + 100;
s->total_weight = av_malloc_array(s->linesize, inlink->h * sizeof(*s->total_weight));
s->sum = av_malloc_array(s->linesize, inlink->h * sizeof(*s->sum));
if (!s->total_weight || !s->sum)
return AVERROR(ENOMEM);
return 0;
}
struct thread_data {
const uint8_t *src;
ptrdiff_t src_linesize;
int startx, starty;
int endx, endy;
const uint32_t *ii_start;
int p;
};
static int nlmeans_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
NLMeansContext *s = ctx->priv;
const uint32_t max_meaningful_diff = s->max_meaningful_diff;
const struct thread_data *td = arg;
const ptrdiff_t src_linesize = td->src_linesize;
const int process_h = td->endy - td->starty;
const int slice_start = (process_h * jobnr ) / nb_jobs;
const int slice_end = (process_h * (jobnr+1)) / nb_jobs;
const int starty = td->starty + slice_start;
const int endy = td->starty + slice_end;
const int p = td->p;
const uint32_t *ii = td->ii_start + (starty - p - 1) * s->ii_lz_32 - p - 1;
const int dist_b = 2*p + 1;
const int dist_d = dist_b * s->ii_lz_32;
const int dist_e = dist_d + dist_b;
const float *const weight_lut = s->weight_lut;
NLMeansDSPContext *dsp = &s->dsp;
for (int y = starty; y < endy; y++) {
const uint8_t *const src = td->src + y*src_linesize;
float *total_weight = s->total_weight + y*s->linesize;
float *sum = s->sum + y*s->linesize;
const uint32_t *const iia = ii;
const uint32_t *const iib = ii + dist_b;
const uint32_t *const iid = ii + dist_d;
const uint32_t *const iie = ii + dist_e;
dsp->compute_weights_line(iia, iib, iid, iie, src, total_weight, sum,
weight_lut, max_meaningful_diff,
td->startx, td->endx);
ii += s->ii_lz_32;
}
return 0;
}
static void weight_averages(uint8_t *dst, ptrdiff_t dst_linesize,
const uint8_t *src, ptrdiff_t src_linesize,
float *total_weight, float *sum, ptrdiff_t linesize,
int w, int h)
{
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
// Also weight the centered pixel
total_weight[x] += 1.f;
sum[x] += 1.f * src[x];
dst[x] = av_clip_uint8(sum[x] / total_weight[x] + 0.5f);
}
dst += dst_linesize;
src += src_linesize;
total_weight += linesize;
sum += linesize;
}
}
static int nlmeans_plane(AVFilterContext *ctx, int w, int h, int p, int r,
uint8_t *dst, ptrdiff_t dst_linesize,
const uint8_t *src, ptrdiff_t src_linesize)
{
NLMeansContext *s = ctx->priv;
/* patches center points cover the whole research window so the patches
* themselves overflow the research window */
const int e = r + p;
/* focus an integral pointer on the centered image (s1) */
const uint32_t *centered_ii = s->ii + e*s->ii_lz_32 + e;
memset(s->total_weight, 0, s->linesize * h * sizeof(*s->total_weight));
memset(s->sum, 0, s->linesize * h * sizeof(*s->sum));
for (int offy = -r; offy <= r; offy++) {
for (int offx = -r; offx <= r; offx++) {
if (offx || offy) {
struct thread_data td = {
.src = src + offy*src_linesize + offx,
.src_linesize = src_linesize,
.startx = FFMAX(0, -offx),
.starty = FFMAX(0, -offy),
.endx = FFMIN(w, w - offx),
.endy = FFMIN(h, h - offy),
.ii_start = centered_ii + offy*s->ii_lz_32 + offx,
.p = p,
};
compute_ssd_integral_image(&s->dsp, s->ii, s->ii_lz_32,
src, src_linesize,
offx, offy, e, w, h);
ff_filter_execute(ctx, nlmeans_slice, &td, NULL,
FFMIN(td.endy - td.starty, ff_filter_get_nb_threads(ctx)));
}
}
}
weight_averages(dst, dst_linesize, src, src_linesize,
s->total_weight, s->sum, s->linesize, w, h);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
NLMeansContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
for (int i = 0; i < s->nb_planes; i++) {
const int w = i ? s->chroma_w : inlink->w;
const int h = i ? s->chroma_h : inlink->h;
const int p = i ? s->patch_hsize_uv : s->patch_hsize;
const int r = i ? s->research_hsize_uv : s->research_hsize;
nlmeans_plane(ctx, w, h, p, r,
out->data[i], out->linesize[i],
in->data[i], in->linesize[i]);
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
#define CHECK_ODD_FIELD(field, name) do { \
if (!(s->field & 1)) { \
s->field |= 1; \
av_log(ctx, AV_LOG_WARNING, name " size must be odd, " \
"setting it to %d\n", s->field); \
} \
} 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,
};