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avfilter/vf_nlmeans: refactor line processing in preparation for x86 SIMD assembly

This commit is contained in:
Paul B Mahol 2021-10-24 14:53:28 +02:00
parent 38c86e7a02
commit eaca36d495
2 changed files with 76 additions and 45 deletions
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107
libavfilter/vf_nlmeans.c
View File

@ -38,11 +38,6 @@
#include "vf_nlmeans.h"
#include "video.h"
struct weighted_avg {
float total_weight;
float sum;
};
typedef struct NLMeansContext {
const AVClass *class;
int nb_planes;
@ -329,6 +324,58 @@ struct thread_data {
int p;
};
static void compute_weights_line_c(const uint32_t *const iia,
const uint32_t *const iib,
const uint32_t *const iid,
const uint32_t *const iie,
const uint8_t *const src,
struct weighted_avg *wa,
const float *const weight_lut,
int max_meaningful_diff,
int startx, int endx)
{
for (int x = startx; x < endx; x++) {
/*
* M is a discrete map where every entry contains the sum of all the entries
* in the rectangle from the top-left origin of M to its coordinate. In the
* following schema, "i" contains the sum of the whole map:
*
* M = +----------+-----------------+----+
* | | | |
* | | | |
* | a| b| c|
* +----------+-----------------+----+
* | | | |
* | | | |
* | | X | |
* | | | |
* | d| e| f|
* +----------+-----------------+----+
* | | | |
* | g| h| i|
* +----------+-----------------+----+
*
* The sum of the X box can be calculated with:
* X = e-d-b+a
*
* See https://en.wikipedia.org/wiki/Summed_area_table
*
* The compute*_ssd functions compute the integral image M where every entry
* contains the sum of the squared difference of every corresponding pixels of
* two input planes of the same size as M.
*/
const uint32_t a = iia[x];
const uint32_t b = iib[x];
const uint32_t d = iid[x];
const uint32_t e = iie[x];
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];
}
}
static int nlmeans_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
NLMeansContext *s = ctx->priv;
@ -346,50 +393,19 @@ static int nlmeans_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs
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 *src = td->src + y*src_linesize;
const uint8_t *const src = td->src + y*src_linesize;
struct weighted_avg *wa = s->wa + y*s->wa_linesize;
for (int x = td->startx; x < td->endx; x++) {
/*
* M is a discrete map where every entry contains the sum of all the entries
* in the rectangle from the top-left origin of M to its coordinate. In the
* following schema, "i" contains the sum of the whole map:
*
* M = +----------+-----------------+----+
* | | | |
* | | | |
* | a| b| c|
* +----------+-----------------+----+
* | | | |
* | | | |
* | | X | |
* | | | |
* | d| e| f|
* +----------+-----------------+----+
* | | | |
* | g| h| i|
* +----------+-----------------+----+
*
* The sum of the X box can be calculated with:
* X = e-d-b+a
*
* See https://en.wikipedia.org/wiki/Summed_area_table
*
* The compute*_ssd functions compute the integral image M where every entry
* contains the sum of the squared difference of every corresponding pixels of
* two input planes of the same size as M.
*/
const uint32_t a = ii[x];
const uint32_t b = ii[x + dist_b];
const uint32_t d = ii[x + dist_d];
const uint32_t e = ii[x + dist_e];
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)
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;
wa[x].total_weight += weight;
wa[x].sum += weight * src[x];
}
dsp->compute_weights_line(iia, iib, iid, iie, src, wa,
weight_lut, max_meaningful_diff,
td->startx, td->endx);
ii += s->ii_lz_32;
}
return 0;
@ -493,6 +509,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
void ff_nlmeans_init(NLMeansDSPContext *dsp)
{
dsp->compute_safe_ssd_integral_image = compute_safe_ssd_integral_image_c;
dsp->compute_weights_line = compute_weights_line_c;
if (ARCH_AARCH64)
ff_nlmeans_init_aarch64(dsp);

14
libavfilter/vf_nlmeans.h
View File

@ -22,11 +22,25 @@
#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,
const uint8_t *s2, ptrdiff_t linesize2,
int w, int h);
void (*compute_weights_line)(const uint32_t *const iia,
const uint32_t *const iib,
const uint32_t *const iid,
const uint32_t *const iie,
const uint8_t *const src,
struct weighted_avg *wa,
const float *const weight_lut,
int max_meaningful_diff,
int startx, int endx);
} NLMeansDSPContext;
void ff_nlmeans_init(NLMeansDSPContext *dsp);