FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_noise.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 0 143 0.0%
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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/opt.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/lfg.h"
30 #include "libavutil/parseutils.h"
31 #include "libavutil/pixdesc.h"
32 #include "avfilter.h"
33 #include "formats.h"
34 #include "internal.h"
35 #include "vf_noise.h"
36 #include "video.h"
37
38 typedef struct ThreadData {
39 AVFrame *in, *out;
40 } ThreadData;
41
42 #define OFFSET(x) offsetof(NoiseContext, x)
43 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
44
45 #define NOISE_PARAMS(name, x, param) \
46 {#name"_seed", "set component #"#x" noise seed", OFFSET(param.seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS}, \
47 {#name"_strength", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
48 {#name"s", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
49 {#name"_flags", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
50 {#name"f", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
51 {"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, #name"_flags"}, \
52 {"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, #name"_flags"}, \
53 {"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, #name"_flags"}, \
54 {"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, #name"_flags"},
55
56 static const AVOption noise_options[] = {
57 NOISE_PARAMS(all, 0, all)
58 NOISE_PARAMS(c0, 0, param[0])
59 NOISE_PARAMS(c1, 1, param[1])
60 NOISE_PARAMS(c2, 2, param[2])
61 NOISE_PARAMS(c3, 3, param[3])
62 {NULL}
63 };
64
65 AVFILTER_DEFINE_CLASS(noise);
66
67 static const int8_t patt[4] = { -1, 0, 1, 0 };
68
69 #define RAND_N(range) ((int) ((double) range * av_lfg_get(lfg) / (UINT_MAX + 1.0)))
70 static av_cold int init_noise(NoiseContext *n, int comp)
71 {
72 int8_t *noise = av_malloc(MAX_NOISE * sizeof(int8_t));
73 FilterParams *fp = &n->param[comp];
74 AVLFG *lfg = &n->param[comp].lfg;
75 int strength = fp->strength;
76 int flags = fp->flags;
77 int i, j;
78
79 if (!noise)
80 return AVERROR(ENOMEM);
81
82 av_lfg_init(&fp->lfg, fp->seed + comp*31415U);
83
84 for (i = 0, j = 0; i < MAX_NOISE; i++, j++) {
85 if (flags & NOISE_UNIFORM) {
86 if (flags & NOISE_AVERAGED) {
87 if (flags & NOISE_PATTERN) {
88 noise[i] = (RAND_N(strength) - strength / 2) / 6
89 + patt[j % 4] * strength * 0.25 / 3;
90 } else {
91 noise[i] = (RAND_N(strength) - strength / 2) / 3;
92 }
93 } else {
94 if (flags & NOISE_PATTERN) {
95 noise[i] = (RAND_N(strength) - strength / 2) / 2
96 + patt[j % 4] * strength * 0.25;
97 } else {
98 noise[i] = RAND_N(strength) - strength / 2;
99 }
100 }
101 } else {
102 double x1, x2, w, y1;
103 do {
104 x1 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
105 x2 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0;
106 w = x1 * x1 + x2 * x2;
107 } while (w >= 1.0);
108
109 w = sqrt((-2.0 * log(w)) / w);
110 y1 = x1 * w;
111 y1 *= strength / sqrt(3.0);
112 if (flags & NOISE_PATTERN) {
113 y1 /= 2;
114 y1 += patt[j % 4] * strength * 0.35;
115 }
116 y1 = av_clipf(y1, -128, 127);
117 if (flags & NOISE_AVERAGED)
118 y1 /= 3.0;
119 noise[i] = (int)y1;
120 }
121 if (RAND_N(6) == 0)
122 j--;
123 }
124
125 for (i = 0; i < MAX_RES; i++)
126 for (j = 0; j < 3; j++)
127 fp->prev_shift[i][j] = noise + (av_lfg_get(lfg) & (MAX_SHIFT - 1));
128
129 fp->noise = noise;
130 return 0;
131 }
132
133 static int query_formats(AVFilterContext *ctx)
134 {
135 AVFilterFormats *formats = NULL;
136 int fmt, ret;
137
138 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
139 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
140 if (desc->flags & AV_PIX_FMT_FLAG_PLANAR && !(desc->comp[0].depth & 7)
141 && (ret = ff_add_format(&formats, fmt)) < 0)
142 return ret;
143 }
144
145 return ff_set_common_formats(ctx, formats);
146 }
147
148 static int config_input(AVFilterLink *inlink)
149 {
150 NoiseContext *n = inlink->dst->priv;
151 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
152 int ret;
153
154 n->nb_planes = av_pix_fmt_count_planes(inlink->format);
155
156 if ((ret = av_image_fill_linesizes(n->bytewidth, inlink->format, inlink->w)) < 0)
157 return ret;
158
159 n->height[1] = n->height[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
160 n->height[0] = n->height[3] = inlink->h;
161
162 return 0;
163 }
164
165 void ff_line_noise_c(uint8_t *dst, const uint8_t *src, const int8_t *noise,
166 int len, int shift)
167 {
168 int i;
169
170 noise += shift;
171 for (i = 0; i < len; i++) {
172 int v = src[i] + noise[i];
173
174 dst[i] = av_clip_uint8(v);
175 }
176 }
177
178 void ff_line_noise_avg_c(uint8_t *dst, const uint8_t *src,
179 int len, const int8_t * const *shift)
180 {
181 int i;
182 const int8_t *src2 = (const int8_t*)src;
183
184 for (i = 0; i < len; i++) {
185 const int n = shift[0][i] + shift[1][i] + shift[2][i];
186 dst[i] = src2[i] + ((n * src2[i]) >> 7);
187 }
188 }
189
190 static void noise(uint8_t *dst, const uint8_t *src,
191 int dst_linesize, int src_linesize,
192 int width, int start, int end, NoiseContext *n, int comp)
193 {
194 FilterParams *p = &n->param[comp];
195 int8_t *noise = p->noise;
196 const int flags = p->flags;
197 int y;
198
199 if (!noise) {
200 if (dst != src)
201 av_image_copy_plane(dst, dst_linesize, src, src_linesize, width, end - start);
202 return;
203 }
204
205 for (y = start; y < end; y++) {
206 const int ix = y & (MAX_RES - 1);
207 int x;
208 for (x=0; x < width; x+= MAX_RES) {
209 int w = FFMIN(width - x, MAX_RES);
210 int shift = p->rand_shift[ix];
211
212 if (flags & NOISE_AVERAGED) {
213 n->line_noise_avg(dst + x, src + x, w, (const int8_t**)p->prev_shift[ix]);
214 p->prev_shift[ix][shift & 3] = noise + shift;
215 } else {
216 n->line_noise(dst + x, src + x, noise, w, shift);
217 }
218 }
219 dst += dst_linesize;
220 src += src_linesize;
221 }
222 }
223
224 static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
225 {
226 NoiseContext *s = ctx->priv;
227 ThreadData *td = arg;
228 int plane;
229
230 for (plane = 0; plane < s->nb_planes; plane++) {
231 const int height = s->height[plane];
232 const int start = (height * jobnr ) / nb_jobs;
233 const int end = (height * (jobnr+1)) / nb_jobs;
234 noise(td->out->data[plane] + start * td->out->linesize[plane],
235 td->in->data[plane] + start * td->in->linesize[plane],
236 td->out->linesize[plane], td->in->linesize[plane],
237 s->bytewidth[plane], start, end, s, plane);
238 }
239 return 0;
240 }
241
242 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
243 {
244 AVFilterContext *ctx = inlink->dst;
245 AVFilterLink *outlink = ctx->outputs[0];
246 NoiseContext *n = ctx->priv;
247 ThreadData td;
248 AVFrame *out;
249 int comp, i;
250
251 if (av_frame_is_writable(inpicref)) {
252 out = inpicref;
253 } else {
254 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
255 if (!out) {
256 av_frame_free(&inpicref);
257 return AVERROR(ENOMEM);
258 }
259 av_frame_copy_props(out, inpicref);
260 }
261
262 for (comp = 0; comp < 4; comp++) {
263 FilterParams *fp = &n->param[comp];
264
265 if ((!fp->rand_shift_init || (fp->flags & NOISE_TEMPORAL)) && fp->strength) {
266
267 for (i = 0; i < MAX_RES; i++) {
268 fp->rand_shift[i] = av_lfg_get(&fp->lfg) & (MAX_SHIFT - 1);
269 }
270 fp->rand_shift_init = 1;
271 }
272 }
273
274 td.in = inpicref; td.out = out;
275 ff_filter_execute(ctx, filter_slice, &td, NULL,
276 FFMIN(n->height[0], ff_filter_get_nb_threads(ctx)));
277 emms_c();
278
279 if (inpicref != out)
280 av_frame_free(&inpicref);
281 return ff_filter_frame(outlink, out);
282 }
283
284 static av_cold int init(AVFilterContext *ctx)
285 {
286 NoiseContext *n = ctx->priv;
287 int ret, i;
288
289 for (i = 0; i < 4; i++) {
290 if (n->all.seed >= 0)
291 n->param[i].seed = n->all.seed;
292 else
293 n->param[i].seed = 123457;
294 if (n->all.strength)
295 n->param[i].strength = n->all.strength;
296 if (n->all.flags)
297 n->param[i].flags = n->all.flags;
298 }
299
300 for (i = 0; i < 4; i++) {
301 if (n->param[i].strength && ((ret = init_noise(n, i)) < 0))
302 return ret;
303 }
304
305 n->line_noise = ff_line_noise_c;
306 n->line_noise_avg = ff_line_noise_avg_c;
307
308 #if ARCH_X86
309 ff_noise_init_x86(n);
310 #endif
311
312 return 0;
313 }
314
315 static av_cold void uninit(AVFilterContext *ctx)
316 {
317 NoiseContext *n = ctx->priv;
318 int i;
319
320 for (i = 0; i < 4; i++)
321 av_freep(&n->param[i].noise);
322 }
323
324 static const AVFilterPad noise_inputs[] = {
325 {
326 .name = "default",
327 .type = AVMEDIA_TYPE_VIDEO,
328 .filter_frame = filter_frame,
329 .config_props = config_input,
330 },
331 };
332
333 static const AVFilterPad noise_outputs[] = {
334 {
335 .name = "default",
336 .type = AVMEDIA_TYPE_VIDEO,
337 },
338 };
339
340 const AVFilter ff_vf_noise = {
341 .name = "noise",
342 .description = NULL_IF_CONFIG_SMALL("Add noise."),
343 .priv_size = sizeof(NoiseContext),
344 .init = init,
345 .uninit = uninit,
346 FILTER_INPUTS(noise_inputs),
347 FILTER_OUTPUTS(noise_outputs),
348 FILTER_QUERY_FUNC(query_formats),
349 .priv_class = &noise_class,
350 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
351 };
352