FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_noise.c
Date: 2024-04-26 14:42:52
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1 /*
2 * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
3 * Copyright (c) 2013 Paul B Mahol
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * noise generator
25 */
26
27 #include "libavutil/emms.h"
28 #include "libavutil/mem.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/imgutils.h"
31 #include "libavutil/lfg.h"
32 #include "libavutil/pixdesc.h"
33 #include "avfilter.h"
34 #include "formats.h"
35 #include "internal.h"
36 #include "vf_noise.h"
37 #include "video.h"
38
39 typedef struct ThreadData {
40 AVFrame *in, *out;
41 } ThreadData;
42
43 #define OFFSET(x) offsetof(NoiseContext, x)
44 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
45
46 #define NOISE_PARAMS(name, x, param) \
47 {#name"_seed", "set component #"#x" noise seed", OFFSET(param.seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS}, \
48 {#name"_strength", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
49 {#name"s", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
50 {#name"_flags", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, .unit = #name"_flags"}, \
51 {#name"f", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, .unit = #name"_flags"}, \
52 {"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, .unit = #name"_flags"}, \
53 {"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, .unit = #name"_flags"}, \
54 {"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, .unit = #name"_flags"}, \
55 {"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, .unit = #name"_flags"},
56
57 static const AVOption noise_options[] = {
58 NOISE_PARAMS(all, 0, all)
59 NOISE_PARAMS(c0, 0, param[0])
60 NOISE_PARAMS(c1, 1, param[1])
61 NOISE_PARAMS(c2, 2, param[2])
62 NOISE_PARAMS(c3, 3, param[3])
63 {NULL}
64 };
65
66 AVFILTER_DEFINE_CLASS(noise);
67
68 static const int8_t patt[4] = { -1, 0, 1, 0 };
69
70 #define RAND_N(range) ((int) ((double) range * av_lfg_get(lfg) / (UINT_MAX + 1.0)))
71 ✗ static av_cold int init_noise(NoiseContext *n, int comp)
72 {
73 ✗ int8_t *noise = av_malloc(MAX_NOISE * sizeof(int8_t));
74 ✗ FilterParams *fp = &n->param[comp];
75 ✗ AVLFG *lfg = &n->param[comp].lfg;
76 ✗ int strength = fp->strength;
77 ✗ int flags = fp->flags;
78 int i, j;
79
80 ✗ if (!noise)
81 ✗ return AVERROR(ENOMEM);
82
83 ✗ av_lfg_init(&fp->lfg, fp->seed + comp*31415U);
84
85 ✗ for (i = 0, j = 0; i < MAX_NOISE; i++, j++) {
86 ✗ if (flags & NOISE_UNIFORM) {
87 ✗ if (flags & NOISE_AVERAGED) {
88 ✗ if (flags & NOISE_PATTERN) {
89 ✗ noise[i] = (RAND_N(strength) - strength / 2) / 6
90 ✗ + patt[j % 4] * strength * 0.25 / 3;
91 } else {
92 ✗ noise[i] = (RAND_N(strength) - strength / 2) / 3;
93 }
94 } else {
95 ✗ if (flags & NOISE_PATTERN) {
96 ✗ noise[i] = (RAND_N(strength) - strength / 2) / 2
97 ✗ + patt[j % 4] * strength * 0.25;
98 } else {
99 ✗ noise[i] = RAND_N(strength) - strength / 2;
100 }
101 }
102 } else {
103 double x1, x2, w, y1;
104 do {
105 ✗ x1 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
106 ✗ x2 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
107 ✗ w = x1 * x1 + x2 * x2;
108 ✗ } while (w >= 1.0);
109
110 ✗ w = sqrt((-2.0 * log(w)) / w);
111 ✗ y1 = x1 * w;
112 ✗ y1 *= strength / sqrt(3.0);
113 ✗ if (flags & NOISE_PATTERN) {
114 ✗ y1 /= 2;
115 ✗ y1 += patt[j % 4] * strength * 0.35;
116 }
117 ✗ y1 = av_clipf(y1, -128, 127);
118 ✗ if (flags & NOISE_AVERAGED)
119 ✗ y1 /= 3.0;
120 ✗ noise[i] = (int)y1;
121 }
122 ✗ if (RAND_N(6) == 0)
123 ✗ j--;
124 }
125
126 ✗ for (i = 0; i < MAX_RES; i++)
127 ✗ for (j = 0; j < 3; j++)
128 ✗ fp->prev_shift[i][j] = noise + (av_lfg_get(lfg) & (MAX_SHIFT - 1));
129
130 ✗ fp->noise = noise;
131 ✗ return 0;
132 }
133
134 ✗ static int query_formats(AVFilterContext *ctx)
135 {
136 ✗ AVFilterFormats *formats = NULL;
137 int fmt, ret;
138
139 ✗ for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
140 ✗ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
141 ✗ if (desc->flags & AV_PIX_FMT_FLAG_PLANAR && !(desc->comp[0].depth & 7)
142 ✗ && (ret = ff_add_format(&formats, fmt)) < 0)
143 ✗ return ret;
144 }
145
146 ✗ return ff_set_common_formats(ctx, formats);
147 }
148
149 ✗ static int config_input(AVFilterLink *inlink)
150 {
151 ✗ NoiseContext *n = inlink->dst->priv;
152 ✗ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
153 int ret;
154
155 ✗ n->nb_planes = av_pix_fmt_count_planes(inlink->format);
156
157 ✗ if ((ret = av_image_fill_linesizes(n->bytewidth, inlink->format, inlink->w)) < 0)
158 ✗ return ret;
159
160 ✗ n->height[1] = n->height[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
161 ✗ n->height[0] = n->height[3] = inlink->h;
162
163 ✗ return 0;
164 }
165
166 ✗ void ff_line_noise_c(uint8_t *dst, const uint8_t *src, const int8_t *noise,
167 int len, int shift)
168 {
169 int i;
170
171 ✗ noise += shift;
172 ✗ for (i = 0; i < len; i++) {
173 ✗ int v = src[i] + noise[i];
174
175 ✗ dst[i] = av_clip_uint8(v);
176 }
177 ✗ }
178
179 ✗ void ff_line_noise_avg_c(uint8_t *dst, const uint8_t *src,
180 int len, const int8_t * const *shift)
181 {
182 int i;
183 ✗ const int8_t *src2 = (const int8_t*)src;
184
185 ✗ for (i = 0; i < len; i++) {
186 ✗ const int n = shift[0][i] + shift[1][i] + shift[2][i];
187 ✗ dst[i] = src2[i] + ((n * src2[i]) >> 7);
188 }
189 ✗ }
190
191 ✗ static void noise(uint8_t *dst, const uint8_t *src,
192 int dst_linesize, int src_linesize,
193 int width, int start, int end, NoiseContext *n, int comp)
194 {
195 ✗ FilterParams *p = &n->param[comp];
196 ✗ int8_t *noise = p->noise;
197 ✗ const int flags = p->flags;
198 int y;
199
200 ✗ if (!noise) {
201 ✗ if (dst != src)
202 ✗ av_image_copy_plane(dst, dst_linesize, src, src_linesize, width, end - start);
203 ✗ return;
204 }
205
206 ✗ for (y = start; y < end; y++) {
207 ✗ const int ix = y & (MAX_RES - 1);
208 int x;
209 ✗ for (x=0; x < width; x+= MAX_RES) {
210 ✗ int w = FFMIN(width - x, MAX_RES);
211 ✗ int shift = p->rand_shift[ix];
212
213 ✗ if (flags & NOISE_AVERAGED) {
214 ✗ n->line_noise_avg(dst + x, src + x, w, (const int8_t**)p->prev_shift[ix]);
215 ✗ p->prev_shift[ix][shift & 3] = noise + shift;
216 } else {
217 ✗ n->line_noise(dst + x, src + x, noise, w, shift);
218 }
219 }
220 ✗ dst += dst_linesize;
221 ✗ src += src_linesize;
222 }
223 }
224
225 ✗ static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
226 {
227 ✗ NoiseContext *s = ctx->priv;
228 ✗ ThreadData *td = arg;
229 int plane;
230
231 ✗ for (plane = 0; plane < s->nb_planes; plane++) {
232 ✗ const int height = s->height[plane];
233 ✗ const int start = (height * jobnr ) / nb_jobs;
234 ✗ const int end = (height * (jobnr+1)) / nb_jobs;
235 ✗ noise(td->out->data[plane] + start * td->out->linesize[plane],
236 ✗ td->in->data[plane] + start * td->in->linesize[plane],
237 ✗ td->out->linesize[plane], td->in->linesize[plane],
238 s->bytewidth[plane], start, end, s, plane);
239 }
240 ✗ return 0;
241 }
242
243 ✗ static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
244 {
245 ✗ AVFilterContext *ctx = inlink->dst;
246 ✗ AVFilterLink *outlink = ctx->outputs[0];
247 ✗ NoiseContext *n = ctx->priv;
248 ThreadData td;
249 AVFrame *out;
250 int comp, i;
251
252 ✗ if (av_frame_is_writable(inpicref)) {
253 ✗ out = inpicref;
254 } else {
255 ✗ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
256 ✗ if (!out) {
257 ✗ av_frame_free(&inpicref);
258 ✗ return AVERROR(ENOMEM);
259 }
260 ✗ av_frame_copy_props(out, inpicref);
261 }
262
263 ✗ for (comp = 0; comp < 4; comp++) {
264 ✗ FilterParams *fp = &n->param[comp];
265
266 ✗ if ((!fp->rand_shift_init || (fp->flags & NOISE_TEMPORAL)) && fp->strength) {
267
268 ✗ for (i = 0; i < MAX_RES; i++) {
269 ✗ fp->rand_shift[i] = av_lfg_get(&fp->lfg) & (MAX_SHIFT - 1);
270 }
271 ✗ fp->rand_shift_init = 1;
272 }
273 }
274
275 ✗ td.in = inpicref; td.out = out;
276 ✗ ff_filter_execute(ctx, filter_slice, &td, NULL,
277 ✗ FFMIN(n->height[0], ff_filter_get_nb_threads(ctx)));
278 ✗ emms_c();
279
280 ✗ if (inpicref != out)
281 ✗ av_frame_free(&inpicref);
282 ✗ return ff_filter_frame(outlink, out);
283 }
284
285 ✗ static av_cold int init(AVFilterContext *ctx)
286 {
287 ✗ NoiseContext *n = ctx->priv;
288 int ret, i;
289
290 ✗ for (i = 0; i < 4; i++) {
291 ✗ if (n->all.seed >= 0)
292 ✗ n->param[i].seed = n->all.seed;
293 else
294 ✗ n->param[i].seed = 123457;
295 ✗ if (n->all.strength)
296 ✗ n->param[i].strength = n->all.strength;
297 ✗ if (n->all.flags)
298 ✗ n->param[i].flags = n->all.flags;
299 }
300
301 ✗ for (i = 0; i < 4; i++) {
302 ✗ if (n->param[i].strength && ((ret = init_noise(n, i)) < 0))
303 ✗ return ret;
304 }
305
306 ✗ n->line_noise = ff_line_noise_c;
307 ✗ n->line_noise_avg = ff_line_noise_avg_c;
308
309 #if ARCH_X86
310 ✗ ff_noise_init_x86(n);
311 #endif
312
313 ✗ return 0;
314 }
315
316 ✗ static av_cold void uninit(AVFilterContext *ctx)
317 {
318 ✗ NoiseContext *n = ctx->priv;
319 int i;
320
321 ✗ for (i = 0; i < 4; i++)
322 ✗ av_freep(&n->param[i].noise);
323 ✗ }
324
325 static const AVFilterPad noise_inputs[] = {
326 {
327 .name = "default",
328 .type = AVMEDIA_TYPE_VIDEO,
329 .filter_frame = filter_frame,
330 .config_props = config_input,
331 },
332 };
333
334 const AVFilter ff_vf_noise = {
335 .name = "noise",
336 .description = NULL_IF_CONFIG_SMALL("Add noise."),
337 .priv_size = sizeof(NoiseContext),
338 .init = init,
339 .uninit = uninit,
340 FILTER_INPUTS(noise_inputs),
341 FILTER_OUTPUTS(ff_video_default_filterpad),
342 FILTER_QUERY_FUNC(query_formats),
343 .priv_class = &noise_class,
344 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
345 };
346