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avfilter/vf_nlmeans: split wa struct 

This will make x86 SIMD simpler and faster.
This commit is contained in:
Paul B Mahol 2021-10-29 16:56:35 +02:00
parent eaca36d495
commit 2b6d290fbf
2 changed files with 27 additions and 24 deletions
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43
libavfilter/vf_nlmeans.c
View File

@ -52,8 +52,9 @@ typedef struct NLMeansContext {
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
struct weighted_avg *wa; // weighted average of every pixel
ptrdiff_t wa_linesize; // linesize for wa in struct size unit
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;
@ -307,9 +308,10 @@ static int config_input(AVFilterLink *inlink)
s->ii = s->ii_orig + s->ii_lz_32 + 1;
// allocate weighted average for every pixel
s->wa_linesize = inlink->w;
s->wa = av_malloc_array(s->wa_linesize, inlink->h * sizeof(*s->wa));
if (!s->wa)
s->linesize = inlink->w;
s->total_weight = av_malloc_array(inlink->w, inlink->h * sizeof(*s->total_weight));
s->sum = av_malloc_array(inlink->w, inlink->h * sizeof(*s->sum));
if (!s->total_weight || !s->sum)
return AVERROR(ENOMEM);
return 0;
@ -329,7 +331,8 @@ static void compute_weights_line_c(const uint32_t *const iia,
const uint32_t *const iid,
const uint32_t *const iie,
const uint8_t *const src,
struct weighted_avg *wa,
float *total_weight,
float *sum,
const float *const weight_lut,
int max_meaningful_diff,
int startx, int endx)
@ -371,8 +374,8 @@ static void compute_weights_line_c(const uint32_t *const iia,
const uint32_t patch_diff_sq = FFMIN(e - d - b + a, max_meaningful_diff);
const float weight = weight_lut[patch_diff_sq]; // exp(-patch_diff_sq * s->pdiff_scale)
wa[x].total_weight += weight;
wa[x].sum += weight * src[x];
total_weight[x] += weight;
sum[x] += weight * src[x];
}
}
@ -397,13 +400,14 @@ static int nlmeans_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs
for (int y = starty; y < endy; y++) {
const uint8_t *const src = td->src + y*src_linesize;
struct weighted_avg *wa = s->wa + y*s->wa_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, wa,
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;
@ -413,19 +417,20 @@ static int nlmeans_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs
static void weight_averages(uint8_t *dst, ptrdiff_t dst_linesize,
const uint8_t *src, ptrdiff_t src_linesize,
struct weighted_avg *wa, ptrdiff_t wa_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
wa[x].total_weight += 1.f;
wa[x].sum += 1.f * src[x];
dst[x] = av_clip_uint8(wa[x].sum / wa[x].total_weight + 0.5f);
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;
wa += wa_linesize;
total_weight += linesize;
sum += linesize;
}
}
@ -440,7 +445,8 @@ static int nlmeans_plane(AVFilterContext *ctx, int w, int h, int p, int r,
/* focus an integral pointer on the centered image (s1) */
const uint32_t *centered_ii = s->ii + e*s->ii_lz_32 + e;
memset(s->wa, 0, s->wa_linesize * h * sizeof(*s->wa));
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++) {
@ -466,7 +472,7 @@ static int nlmeans_plane(AVFilterContext *ctx, int w, int h, int p, int r,
}
weight_averages(dst, dst_linesize, src, src_linesize,
s->wa, s->wa_linesize, w, h);
s->total_weight, s->sum, s->linesize, w, h);
return 0;
}
@ -556,7 +562,8 @@ static av_cold void uninit(AVFilterContext *ctx)
NLMeansContext *s = ctx->priv;
av_freep(&s->weight_lut);
av_freep(&s->ii_orig);
av_freep(&s->wa);
av_freep(&s->total_weight);
av_freep(&s->sum);
}
static const AVFilterPad nlmeans_inputs[] = {

8
libavfilter/vf_nlmeans.h
View File

@ -22,11 +22,6 @@
#include <stddef.h>
#include <stdint.h>
struct weighted_avg {
float total_weight;
float sum;
};
typedef struct NLMeansDSPContext {
void (*compute_safe_ssd_integral_image)(uint32_t *dst, ptrdiff_t dst_linesize_32,
const uint8_t *s1, ptrdiff_t linesize1,
@ -37,7 +32,8 @@ typedef struct NLMeansDSPContext {
const uint32_t *const iid,
const uint32_t *const iie,
const uint8_t *const src,
struct weighted_avg *wa,
float *total_weight,
float *sum,
const float *const weight_lut,
int max_meaningful_diff,
int startx, int endx);