mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-25 19:01:51 +02:00
352 lines
11 KiB
C
352 lines
11 KiB
C
/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2013 Paul B Mahol
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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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* @file
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* noise generator
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*/
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/lfg.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "vf_noise.h"
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#include "video.h"
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typedef struct ThreadData {
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AVFrame *in, *out;
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} ThreadData;
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#define OFFSET(x) offsetof(NoiseContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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#define NOISE_PARAMS(name, x, param) \
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{#name"_seed", "set component #"#x" noise seed", OFFSET(param.seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS}, \
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{#name"_strength", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
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{#name"s", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
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{#name"_flags", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
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{#name"f", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
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{"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, #name"_flags"}, \
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{"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, #name"_flags"}, \
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{"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, #name"_flags"}, \
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{"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, #name"_flags"},
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static const AVOption noise_options[] = {
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NOISE_PARAMS(all, 0, all)
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NOISE_PARAMS(c0, 0, param[0])
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NOISE_PARAMS(c1, 1, param[1])
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NOISE_PARAMS(c2, 2, param[2])
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NOISE_PARAMS(c3, 3, param[3])
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(noise);
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static const int8_t patt[4] = { -1, 0, 1, 0 };
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#define RAND_N(range) ((int) ((double) range * av_lfg_get(lfg) / (UINT_MAX + 1.0)))
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static av_cold int init_noise(NoiseContext *n, int comp)
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{
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int8_t *noise = av_malloc(MAX_NOISE * sizeof(int8_t));
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FilterParams *fp = &n->param[comp];
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AVLFG *lfg = &n->param[comp].lfg;
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int strength = fp->strength;
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int flags = fp->flags;
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int i, j;
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if (!noise)
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return AVERROR(ENOMEM);
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av_lfg_init(&fp->lfg, fp->seed + comp*31415U);
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for (i = 0, j = 0; i < MAX_NOISE; i++, j++) {
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if (flags & NOISE_UNIFORM) {
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if (flags & NOISE_AVERAGED) {
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if (flags & NOISE_PATTERN) {
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noise[i] = (RAND_N(strength) - strength / 2) / 6
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+ patt[j % 4] * strength * 0.25 / 3;
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} else {
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noise[i] = (RAND_N(strength) - strength / 2) / 3;
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}
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} else {
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if (flags & NOISE_PATTERN) {
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noise[i] = (RAND_N(strength) - strength / 2) / 2
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+ patt[j % 4] * strength * 0.25;
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} else {
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noise[i] = RAND_N(strength) - strength / 2;
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}
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}
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} else {
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double x1, x2, w, y1;
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do {
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x1 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
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x2 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
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w = x1 * x1 + x2 * x2;
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} while (w >= 1.0);
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w = sqrt((-2.0 * log(w)) / w);
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y1 = x1 * w;
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y1 *= strength / sqrt(3.0);
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if (flags & NOISE_PATTERN) {
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y1 /= 2;
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y1 += patt[j % 4] * strength * 0.35;
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}
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y1 = av_clipf(y1, -128, 127);
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if (flags & NOISE_AVERAGED)
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y1 /= 3.0;
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noise[i] = (int)y1;
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}
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if (RAND_N(6) == 0)
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j--;
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}
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for (i = 0; i < MAX_RES; i++)
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for (j = 0; j < 3; j++)
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fp->prev_shift[i][j] = noise + (av_lfg_get(lfg) & (MAX_SHIFT - 1));
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fp->noise = noise;
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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int fmt, ret;
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for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
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if (desc->flags & AV_PIX_FMT_FLAG_PLANAR && !(desc->comp[0].depth & 7)
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&& (ret = ff_add_format(&formats, fmt)) < 0)
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return ret;
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}
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return ff_set_common_formats(ctx, formats);
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}
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static int config_input(AVFilterLink *inlink)
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{
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NoiseContext *n = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int ret;
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n->nb_planes = av_pix_fmt_count_planes(inlink->format);
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if ((ret = av_image_fill_linesizes(n->bytewidth, inlink->format, inlink->w)) < 0)
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return ret;
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n->height[1] = n->height[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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n->height[0] = n->height[3] = inlink->h;
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return 0;
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}
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void ff_line_noise_c(uint8_t *dst, const uint8_t *src, const int8_t *noise,
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int len, int shift)
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{
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int i;
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noise += shift;
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for (i = 0; i < len; i++) {
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int v = src[i] + noise[i];
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dst[i] = av_clip_uint8(v);
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}
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}
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void ff_line_noise_avg_c(uint8_t *dst, const uint8_t *src,
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int len, const int8_t * const *shift)
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{
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int i;
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const int8_t *src2 = (const int8_t*)src;
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for (i = 0; i < len; i++) {
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const int n = shift[0][i] + shift[1][i] + shift[2][i];
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dst[i] = src2[i] + ((n * src2[i]) >> 7);
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}
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}
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static void noise(uint8_t *dst, const uint8_t *src,
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int dst_linesize, int src_linesize,
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int width, int start, int end, NoiseContext *n, int comp)
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{
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FilterParams *p = &n->param[comp];
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int8_t *noise = p->noise;
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const int flags = p->flags;
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int y;
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if (!noise) {
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if (dst != src)
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av_image_copy_plane(dst, dst_linesize, src, src_linesize, width, end - start);
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return;
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}
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for (y = start; y < end; y++) {
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const int ix = y & (MAX_RES - 1);
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int x;
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for (x=0; x < width; x+= MAX_RES) {
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int w = FFMIN(width - x, MAX_RES);
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int shift = p->rand_shift[ix];
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if (flags & NOISE_AVERAGED) {
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n->line_noise_avg(dst + x, src + x, w, (const int8_t**)p->prev_shift[ix]);
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p->prev_shift[ix][shift & 3] = noise + shift;
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} else {
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n->line_noise(dst + x, src + x, noise, w, shift);
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}
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}
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dst += dst_linesize;
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src += src_linesize;
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}
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}
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static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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NoiseContext *s = ctx->priv;
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ThreadData *td = arg;
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int plane;
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for (plane = 0; plane < s->nb_planes; plane++) {
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const int height = s->height[plane];
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const int start = (height * jobnr ) / nb_jobs;
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const int end = (height * (jobnr+1)) / nb_jobs;
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noise(td->out->data[plane] + start * td->out->linesize[plane],
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td->in->data[plane] + start * td->in->linesize[plane],
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td->out->linesize[plane], td->in->linesize[plane],
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s->bytewidth[plane], start, end, s, plane);
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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NoiseContext *n = ctx->priv;
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ThreadData td;
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AVFrame *out;
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int comp, i;
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if (av_frame_is_writable(inpicref)) {
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out = inpicref;
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} else {
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&inpicref);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, inpicref);
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}
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for (comp = 0; comp < 4; comp++) {
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FilterParams *fp = &n->param[comp];
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if ((!fp->rand_shift_init || (fp->flags & NOISE_TEMPORAL)) && fp->strength) {
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for (i = 0; i < MAX_RES; i++) {
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fp->rand_shift[i] = av_lfg_get(&fp->lfg) & (MAX_SHIFT - 1);
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}
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fp->rand_shift_init = 1;
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}
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}
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td.in = inpicref; td.out = out;
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ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(n->height[0], ff_filter_get_nb_threads(ctx)));
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emms_c();
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if (inpicref != out)
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av_frame_free(&inpicref);
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return ff_filter_frame(outlink, out);
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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NoiseContext *n = ctx->priv;
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int ret, i;
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for (i = 0; i < 4; i++) {
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if (n->all.seed >= 0)
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n->param[i].seed = n->all.seed;
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else
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n->param[i].seed = 123457;
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if (n->all.strength)
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n->param[i].strength = n->all.strength;
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if (n->all.flags)
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n->param[i].flags = n->all.flags;
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}
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for (i = 0; i < 4; i++) {
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if (n->param[i].strength && ((ret = init_noise(n, i)) < 0))
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return ret;
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}
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n->line_noise = ff_line_noise_c;
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n->line_noise_avg = ff_line_noise_avg_c;
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if (ARCH_X86)
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ff_noise_init_x86(n);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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NoiseContext *n = ctx->priv;
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int i;
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for (i = 0; i < 4; i++)
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av_freep(&n->param[i].noise);
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}
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static const AVFilterPad noise_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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{ NULL }
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};
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static const AVFilterPad noise_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_noise = {
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.name = "noise",
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.description = NULL_IF_CONFIG_SMALL("Add noise."),
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.priv_size = sizeof(NoiseContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = noise_inputs,
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.outputs = noise_outputs,
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.priv_class = &noise_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
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};
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