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FFmpeg/libavfilter/vf_noise.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

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/*
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2013 Paul B Mahol
*
* 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
*/
/**
* @file
* noise generator
*/
#include "libavutil/emms.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/lfg.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "vf_noise.h"
#include "video.h"
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
#define OFFSET(x) offsetof(NoiseContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define NOISE_PARAMS(name, x, param) \
{#name"_seed", "set component #"#x" noise seed", OFFSET(param.seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS}, \
{#name"_strength", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
{#name"s", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
{#name"_flags", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, .unit = #name"_flags"}, \
{#name"f", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, .unit = #name"_flags"}, \
{"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, .unit = #name"_flags"}, \
{"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, .unit = #name"_flags"}, \
{"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, .unit = #name"_flags"}, \
{"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, .unit = #name"_flags"},
static const AVOption noise_options[] = {
NOISE_PARAMS(all, 0, all)
NOISE_PARAMS(c0, 0, param[0])
NOISE_PARAMS(c1, 1, param[1])
NOISE_PARAMS(c2, 2, param[2])
NOISE_PARAMS(c3, 3, param[3])
{NULL}
};
AVFILTER_DEFINE_CLASS(noise);
static const int8_t patt[4] = { -1, 0, 1, 0 };
#define RAND_N(range) ((int) ((double) range * av_lfg_get(lfg) / (UINT_MAX + 1.0)))
static av_cold int init_noise(NoiseContext *n, int comp)
{
int8_t *noise = av_malloc(MAX_NOISE * sizeof(int8_t));
FilterParams *fp = &n->param[comp];
AVLFG *lfg = &n->param[comp].lfg;
int strength = fp->strength;
int flags = fp->flags;
int i, j;
if (!noise)
return AVERROR(ENOMEM);
av_lfg_init(&fp->lfg, fp->seed + comp*31415U);
for (i = 0, j = 0; i < MAX_NOISE; i++, j++) {
if (flags & NOISE_UNIFORM) {
if (flags & NOISE_AVERAGED) {
if (flags & NOISE_PATTERN) {
noise[i] = (RAND_N(strength) - strength / 2) / 6
+ patt[j % 4] * strength * 0.25 / 3;
} else {
noise[i] = (RAND_N(strength) - strength / 2) / 3;
}
} else {
if (flags & NOISE_PATTERN) {
noise[i] = (RAND_N(strength) - strength / 2) / 2
+ patt[j % 4] * strength * 0.25;
} else {
noise[i] = RAND_N(strength) - strength / 2;
}
}
} else {
double x1, x2, w, y1;
do {
x1 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
x2 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
w = x1 * x1 + x2 * x2;
} while (w >= 1.0);
w = sqrt((-2.0 * log(w)) / w);
y1 = x1 * w;
y1 *= strength / sqrt(3.0);
if (flags & NOISE_PATTERN) {
y1 /= 2;
y1 += patt[j % 4] * strength * 0.35;
}
y1 = av_clipf(y1, -128, 127);
if (flags & NOISE_AVERAGED)
y1 /= 3.0;
noise[i] = (int)y1;
}
if (RAND_N(6) == 0)
j--;
}
for (i = 0; i < MAX_RES; i++)
for (j = 0; j < 3; j++)
fp->prev_shift[i][j] = noise + (av_lfg_get(lfg) & (MAX_SHIFT - 1));
fp->noise = noise;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats = NULL;
int fmt, ret;
for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
if (desc->flags & AV_PIX_FMT_FLAG_PLANAR && !(desc->comp[0].depth & 7)
&& (ret = ff_add_format(&formats, fmt)) < 0)
return ret;
}
return ff_set_common_formats(ctx, formats);
}
static int config_input(AVFilterLink *inlink)
{
NoiseContext *n = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int ret;
n->nb_planes = av_pix_fmt_count_planes(inlink->format);
if ((ret = av_image_fill_linesizes(n->bytewidth, inlink->format, inlink->w)) < 0)
return ret;
n->height[1] = n->height[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
n->height[0] = n->height[3] = inlink->h;
return 0;
}
void ff_line_noise_c(uint8_t *dst, const uint8_t *src, const int8_t *noise,
int len, int shift)
{
int i;
noise += shift;
for (i = 0; i < len; i++) {
int v = src[i] + noise[i];
dst[i] = av_clip_uint8(v);
}
}
void ff_line_noise_avg_c(uint8_t *dst, const uint8_t *src,
int len, const int8_t * const *shift)
{
int i;
const int8_t *src2 = (const int8_t*)src;
for (i = 0; i < len; i++) {
const int n = shift[0][i] + shift[1][i] + shift[2][i];
dst[i] = src2[i] + ((n * src2[i]) >> 7);
}
}
static void noise(uint8_t *dst, const uint8_t *src,
int dst_linesize, int src_linesize,
int width, int start, int end, NoiseContext *n, int comp)
{
FilterParams *p = &n->param[comp];
int8_t *noise = p->noise;
const int flags = p->flags;
int y;
if (!noise) {
if (dst != src)
av_image_copy_plane(dst, dst_linesize, src, src_linesize, width, end - start);
return;
}
for (y = start; y < end; y++) {
const int ix = y & (MAX_RES - 1);
int x;
for (x=0; x < width; x+= MAX_RES) {
int w = FFMIN(width - x, MAX_RES);
int shift = p->rand_shift[ix];
if (flags & NOISE_AVERAGED) {
n->line_noise_avg(dst + x, src + x, w, (const int8_t**)p->prev_shift[ix]);
p->prev_shift[ix][shift & 3] = noise + shift;
} else {
n->line_noise(dst + x, src + x, noise, w, shift);
}
}
dst += dst_linesize;
src += src_linesize;
}
}
static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
NoiseContext *s = ctx->priv;
ThreadData *td = arg;
int plane;
for (plane = 0; plane < s->nb_planes; plane++) {
const int height = s->height[plane];
const int start = (height * jobnr ) / nb_jobs;
const int end = (height * (jobnr+1)) / nb_jobs;
noise(td->out->data[plane] + start * td->out->linesize[plane],
td->in->data[plane] + start * td->in->linesize[plane],
td->out->linesize[plane], td->in->linesize[plane],
s->bytewidth[plane], start, end, s, plane);
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
NoiseContext *n = ctx->priv;
ThreadData td;
AVFrame *out;
int comp, i;
if (av_frame_is_writable(inpicref)) {
out = inpicref;
} else {
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&inpicref);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, inpicref);
}
for (comp = 0; comp < 4; comp++) {
FilterParams *fp = &n->param[comp];
if ((!fp->rand_shift_init || (fp->flags & NOISE_TEMPORAL)) && fp->strength) {
for (i = 0; i < MAX_RES; i++) {
fp->rand_shift[i] = av_lfg_get(&fp->lfg) & (MAX_SHIFT - 1);
}
fp->rand_shift_init = 1;
}
}
td.in = inpicref; td.out = out;
ff_filter_execute(ctx, filter_slice, &td, NULL,
FFMIN(n->height[0], ff_filter_get_nb_threads(ctx)));
emms_c();
if (inpicref != out)
av_frame_free(&inpicref);
return ff_filter_frame(outlink, out);
}
static av_cold int init(AVFilterContext *ctx)
{
NoiseContext *n = ctx->priv;
int ret, i;
for (i = 0; i < 4; i++) {
if (n->all.seed >= 0)
n->param[i].seed = n->all.seed;
else
n->param[i].seed = 123457;
if (n->all.strength)
n->param[i].strength = n->all.strength;
if (n->all.flags)
n->param[i].flags = n->all.flags;
}
for (i = 0; i < 4; i++) {
if (n->param[i].strength && ((ret = init_noise(n, i)) < 0))
return ret;
}
n->line_noise = ff_line_noise_c;
n->line_noise_avg = ff_line_noise_avg_c;
#if ARCH_X86
ff_noise_init_x86(n);
#endif
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
NoiseContext *n = ctx->priv;
int i;
for (i = 0; i < 4; i++)
av_freep(&n->param[i].noise);
}
static const AVFilterPad noise_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
const AVFilter ff_vf_noise = {
.name = "noise",
.description = NULL_IF_CONFIG_SMALL("Add noise."),
.priv_size = sizeof(NoiseContext),
.init = init,
.uninit = uninit,
FILTER_INPUTS(noise_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &noise_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};
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