FFmpeg
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vf_noise.c
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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 
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)))
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 
134 {
136  int fmt;
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_minus1 + 1) & 7))
141  ff_add_format(&formats, fmt);
142  }
143 
144  return ff_set_common_formats(ctx, formats);
145 }
146 
147 static int config_input(AVFilterLink *inlink)
148 {
149  NoiseContext *n = inlink->dst->priv;
150  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
151  int ret;
152 
154 
155  if ((ret = av_image_fill_linesizes(n->bytewidth, inlink->format, inlink->w)) < 0)
156  return ret;
157 
158  n->height[1] = n->height[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
159  n->height[0] = n->height[3] = inlink->h;
160 
161  return 0;
162 }
163 
164 void ff_line_noise_c(uint8_t *dst, const uint8_t *src, const int8_t *noise,
165  int len, int shift)
166 {
167  int i;
168 
169  noise += shift;
170  for (i = 0; i < len; i++) {
171  int v = src[i] + noise[i];
172 
173  dst[i] = av_clip_uint8(v);
174  }
175 }
176 
178  int len, const int8_t * const *shift)
179 {
180  int i;
181  const int8_t *src2 = (const int8_t*)src;
182 
183  for (i = 0; i < len; i++) {
184  const int n = shift[0][i] + shift[1][i] + shift[2][i];
185  dst[i] = src2[i] + ((n * src2[i]) >> 7);
186  }
187 }
188 
189 static void noise(uint8_t *dst, const uint8_t *src,
190  int dst_linesize, int src_linesize,
191  int width, int start, int end, NoiseContext *n, int comp)
192 {
193  FilterParams *p = &n->param[comp];
194  int8_t *noise = p->noise;
195  const int flags = p->flags;
196  int y;
197 
198  if (!noise) {
199  if (dst != src)
200  av_image_copy_plane(dst, dst_linesize, src, src_linesize, width, end - start);
201  return;
202  }
203 
204  for (y = start; y < end; y++) {
205  const int ix = y & (MAX_RES - 1);
206  int x;
207  for (x=0; x < width; x+= MAX_RES) {
208  int w = FFMIN(width - x, MAX_RES);
209  int shift = p->rand_shift[ix];
210 
211  if (flags & NOISE_AVERAGED) {
212  n->line_noise_avg(dst + x, src + x, w, (const int8_t**)p->prev_shift[ix]);
213  p->prev_shift[ix][shift & 3] = noise + shift;
214  } else {
215  n->line_noise(dst + x, src + x, noise, w, shift);
216  }
217  }
218  dst += dst_linesize;
219  src += src_linesize;
220  }
221 }
222 
223 static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
224 {
225  NoiseContext *s = ctx->priv;
226  ThreadData *td = arg;
227  int plane;
228 
229  for (plane = 0; plane < s->nb_planes; plane++) {
230  const int height = s->height[plane];
231  const int start = (height * jobnr ) / nb_jobs;
232  const int end = (height * (jobnr+1)) / nb_jobs;
233  noise(td->out->data[plane] + start * td->out->linesize[plane],
234  td->in->data[plane] + start * td->in->linesize[plane],
235  td->out->linesize[plane], td->in->linesize[plane],
236  s->bytewidth[plane], start, end, s, plane);
237  }
238  return 0;
239 }
240 
241 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
242 {
243  AVFilterContext *ctx = inlink->dst;
244  AVFilterLink *outlink = ctx->outputs[0];
245  NoiseContext *n = ctx->priv;
246  ThreadData td;
247  AVFrame *out;
248  int comp, i;
249 
250  if (av_frame_is_writable(inpicref)) {
251  out = inpicref;
252  } else {
253  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
254  if (!out) {
255  av_frame_free(&inpicref);
256  return AVERROR(ENOMEM);
257  }
258  av_frame_copy_props(out, inpicref);
259  }
260 
261  for (comp = 0; comp < 4; comp++) {
262  FilterParams *fp = &n->param[comp];
263 
264  if ((!fp->rand_shift_init || (fp->flags & NOISE_TEMPORAL)) && fp->strength) {
265 
266  for (i = 0; i < MAX_RES; i++) {
267  fp->rand_shift[i] = av_lfg_get(&fp->lfg) & (MAX_SHIFT - 1);
268  }
269  fp->rand_shift_init = 1;
270  }
271  }
272 
273  td.in = inpicref; td.out = out;
274  ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(n->height[0], ctx->graph->nb_threads));
275  emms_c();
276 
277  if (inpicref != out)
278  av_frame_free(&inpicref);
279  return ff_filter_frame(outlink, out);
280 }
281 
282 static av_cold int init(AVFilterContext *ctx)
283 {
284  NoiseContext *n = ctx->priv;
285  int ret, i;
286 
287  for (i = 0; i < 4; i++) {
288  if (n->all.seed >= 0)
289  n->param[i].seed = n->all.seed;
290  else
291  n->param[i].seed = 123457;
292  if (n->all.strength)
293  n->param[i].strength = n->all.strength;
294  if (n->all.flags)
295  n->param[i].flags = n->all.flags;
296  }
297 
298  for (i = 0; i < 4; i++) {
299  if (n->param[i].strength && ((ret = init_noise(n, i)) < 0))
300  return ret;
301  }
302 
305 
306  if (ARCH_X86)
308 
309  return 0;
310 }
311 
312 static av_cold void uninit(AVFilterContext *ctx)
313 {
314  NoiseContext *n = ctx->priv;
315  int i;
316 
317  for (i = 0; i < 4; i++)
318  av_freep(&n->param[i].noise);
319 }
320 
321 static const AVFilterPad noise_inputs[] = {
322  {
323  .name = "default",
324  .type = AVMEDIA_TYPE_VIDEO,
325  .filter_frame = filter_frame,
326  .config_props = config_input,
327  },
328  { NULL }
329 };
330 
331 static const AVFilterPad noise_outputs[] = {
332  {
333  .name = "default",
334  .type = AVMEDIA_TYPE_VIDEO,
335  },
336  { NULL }
337 };
338 
340  .name = "noise",
341  .description = NULL_IF_CONFIG_SMALL("Add noise."),
342  .priv_size = sizeof(NoiseContext),
343  .init = init,
344  .uninit = uninit,
346  .inputs = noise_inputs,
347  .outputs = noise_outputs,
348  .priv_class = &noise_class,
350 };