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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavfilter / vf_dctdnoiz.c
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2ba45a60
DM		 1/*
2 * Copyright (c) 2013-2014 Clément Bœsch
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * A simple, relatively efficient and slow DCT image denoiser.
23 *
24 * @see http://www.ipol.im/pub/art/2011/ys-dct/
25 *
26 * The DCT factorization used is based on "Fast and numerically stable
27 * algorithms for discrete cosine transforms" from Gerlind Plonkaa & Manfred
28 * Tasche (DOI: 10.1016/j.laa.2004.07.015).
29 */
30
31#include "libavutil/avassert.h"
32#include "libavutil/eval.h"
33#include "libavutil/opt.h"
34#include "internal.h"
35
36static const char *const var_names[] = { "c", NULL };
37enum { VAR_C, VAR_VARS_NB };
38
39#define MAX_THREADS 8
40
41typedef struct DCTdnoizContext {
42 const AVClass *class;
43
44 /* coefficient factor expression */
45 char *expr_str;
46 AVExpr *expr[MAX_THREADS];
47 double var_values[MAX_THREADS][VAR_VARS_NB];
48
49 int nb_threads;
50 int pr_width, pr_height; // width and height to process
51 float sigma; // used when no expression are st
52 float th; // threshold (3*sigma)
53 float *cbuf[2][3]; // two planar rgb color buffers
54 float *slices[MAX_THREADS]; // slices buffers (1 slice buffer per thread)
55 float *weights; // dct coeff are cumulated with overlapping; these values are used for averaging
56 int p_linesize; // line sizes for color and weights
57 int overlap; // number of block overlapping pixels
58 int step; // block step increment (blocksize - overlap)
59 int n; // 1<<n is the block size
60 int bsize; // block size, 1<<n
61 void (*filter_freq_func)(struct DCTdnoizContext *s,
62 const float *src, int src_linesize,
63 float *dst, int dst_linesize,
64 int thread_id);
65 void (*color_decorrelation)(float **dst, int dst_linesize,
66 const uint8_t *src, int src_linesize,
67 int w, int h);
68 void (*color_correlation)(uint8_t *dst, int dst_linesize,
69 float **src, int src_linesize,
70 int w, int h);
71} DCTdnoizContext;
72
73#define MIN_NBITS 3 /* blocksize = 1<<3 = 8 */
74#define MAX_NBITS 4 /* blocksize = 1<<4 = 16 */
75#define DEFAULT_NBITS 3
76
77#define OFFSET(x) offsetof(DCTdnoizContext, x)
78#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
79static const AVOption dctdnoiz_options[] = {
80 { "sigma", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS },
81 { "s", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS },
82 { "overlap", "set number of block overlapping pixels", OFFSET(overlap), AV_OPT_TYPE_INT, {.i64=-1}, -1, (1<<MAX_NBITS)-1, .flags = FLAGS },
83 { "expr", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
84 { "e", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
85 { "n", "set the block size, expressed in bits", OFFSET(n), AV_OPT_TYPE_INT, {.i64=DEFAULT_NBITS}, MIN_NBITS, MAX_NBITS, .flags = FLAGS },
86 { NULL }
87};
88
89AVFILTER_DEFINE_CLASS(dctdnoiz);
90
91static void av_always_inline fdct8_1d(float *dst, const float *src,
92 int dst_stridea, int dst_strideb,
93 int src_stridea, int src_strideb)
94{
95 int i;
96
97 for (i = 0; i < 8; i++) {
98 const float x00 = src[0*src_stridea] + src[7*src_stridea];
99 const float x01 = src[1*src_stridea] + src[6*src_stridea];
100 const float x02 = src[2*src_stridea] + src[5*src_stridea];
101 const float x03 = src[3*src_stridea] + src[4*src_stridea];
102 const float x04 = src[0*src_stridea] - src[7*src_stridea];
103 const float x05 = src[1*src_stridea] - src[6*src_stridea];
104 const float x06 = src[2*src_stridea] - src[5*src_stridea];
105 const float x07 = src[3*src_stridea] - src[4*src_stridea];
106 const float x08 = x00 + x03;
107 const float x09 = x01 + x02;
108 const float x0a = x00 - x03;
109 const float x0b = x01 - x02;
110 const float x0c = 1.38703984532215f*x04 + 0.275899379282943f*x07;
111 const float x0d = 1.17587560241936f*x05 + 0.785694958387102f*x06;
112 const float x0e = -0.785694958387102f*x05 + 1.17587560241936f*x06;
113 const float x0f = 0.275899379282943f*x04 - 1.38703984532215f*x07;
114 const float x10 = 0.353553390593274f * (x0c - x0d);
115 const float x11 = 0.353553390593274f * (x0e - x0f);
116 dst[0*dst_stridea] = 0.353553390593274f * (x08 + x09);
117 dst[1*dst_stridea] = 0.353553390593274f * (x0c + x0d);
118 dst[2*dst_stridea] = 0.461939766255643f*x0a + 0.191341716182545f*x0b;
119 dst[3*dst_stridea] = 0.707106781186547f * (x10 - x11);
120 dst[4*dst_stridea] = 0.353553390593274f * (x08 - x09);
121 dst[5*dst_stridea] = 0.707106781186547f * (x10 + x11);
122 dst[6*dst_stridea] = 0.191341716182545f*x0a - 0.461939766255643f*x0b;
123 dst[7*dst_stridea] = 0.353553390593274f * (x0e + x0f);
124 dst += dst_strideb;
125 src += src_strideb;
126 }
127}
128
129static void av_always_inline idct8_1d(float *dst, const float *src,
130 int dst_stridea, int dst_strideb,
131 int src_stridea, int src_strideb,
132 int add)
133{
134 int i;
135
136 for (i = 0; i < 8; i++) {
137 const float x00 = 1.4142135623731f *src[0*src_stridea];
138 const float x01 = 1.38703984532215f *src[1*src_stridea] + 0.275899379282943f*src[7*src_stridea];
139 const float x02 = 1.30656296487638f *src[2*src_stridea] + 0.541196100146197f*src[6*src_stridea];
140 const float x03 = 1.17587560241936f *src[3*src_stridea] + 0.785694958387102f*src[5*src_stridea];
141 const float x04 = 1.4142135623731f *src[4*src_stridea];
142 const float x05 = -0.785694958387102f*src[3*src_stridea] + 1.17587560241936f*src[5*src_stridea];
143 const float x06 = 0.541196100146197f*src[2*src_stridea] - 1.30656296487638f*src[6*src_stridea];
144 const float x07 = -0.275899379282943f*src[1*src_stridea] + 1.38703984532215f*src[7*src_stridea];
145 const float x09 = x00 + x04;
146 const float x0a = x01 + x03;
147 const float x0b = 1.4142135623731f*x02;
148 const float x0c = x00 - x04;
149 const float x0d = x01 - x03;
150 const float x0e = 0.353553390593274f * (x09 - x0b);
151 const float x0f = 0.353553390593274f * (x0c + x0d);
152 const float x10 = 0.353553390593274f * (x0c - x0d);
153 const float x11 = 1.4142135623731f*x06;
154 const float x12 = x05 + x07;
155 const float x13 = x05 - x07;
156 const float x14 = 0.353553390593274f * (x11 + x12);
157 const float x15 = 0.353553390593274f * (x11 - x12);
158 const float x16 = 0.5f*x13;
159 dst[0*dst_stridea] = (add ? dst[ 0*dst_stridea] : 0) + 0.25f * (x09 + x0b) + 0.353553390593274f*x0a;
160 dst[1*dst_stridea] = (add ? dst[ 1*dst_stridea] : 0) + 0.707106781186547f * (x0f + x15);
161 dst[2*dst_stridea] = (add ? dst[ 2*dst_stridea] : 0) + 0.707106781186547f * (x0f - x15);
162 dst[3*dst_stridea] = (add ? dst[ 3*dst_stridea] : 0) + 0.707106781186547f * (x0e + x16);
163 dst[4*dst_stridea] = (add ? dst[ 4*dst_stridea] : 0) + 0.707106781186547f * (x0e - x16);
164 dst[5*dst_stridea] = (add ? dst[ 5*dst_stridea] : 0) + 0.707106781186547f * (x10 - x14);
165 dst[6*dst_stridea] = (add ? dst[ 6*dst_stridea] : 0) + 0.707106781186547f * (x10 + x14);
166 dst[7*dst_stridea] = (add ? dst[ 7*dst_stridea] : 0) + 0.25f * (x09 + x0b) - 0.353553390593274f*x0a;
167 dst += dst_strideb;
168 src += src_strideb;
169 }
170}
171
172
173static void av_always_inline fdct16_1d(float *dst, const float *src,
174 int dst_stridea, int dst_strideb,
175 int src_stridea, int src_strideb)
176{
177 int i;
178
179 for (i = 0; i < 16; i++) {
180 const float x00 = src[ 0*src_stridea] + src[15*src_stridea];
181 const float x01 = src[ 1*src_stridea] + src[14*src_stridea];
182 const float x02 = src[ 2*src_stridea] + src[13*src_stridea];
183 const float x03 = src[ 3*src_stridea] + src[12*src_stridea];
184 const float x04 = src[ 4*src_stridea] + src[11*src_stridea];
185 const float x05 = src[ 5*src_stridea] + src[10*src_stridea];
186 const float x06 = src[ 6*src_stridea] + src[ 9*src_stridea];
187 const float x07 = src[ 7*src_stridea] + src[ 8*src_stridea];
188 const float x08 = src[ 0*src_stridea] - src[15*src_stridea];
189 const float x09 = src[ 1*src_stridea] - src[14*src_stridea];
190 const float x0a = src[ 2*src_stridea] - src[13*src_stridea];
191 const float x0b = src[ 3*src_stridea] - src[12*src_stridea];
192 const float x0c = src[ 4*src_stridea] - src[11*src_stridea];
193 const float x0d = src[ 5*src_stridea] - src[10*src_stridea];
194 const float x0e = src[ 6*src_stridea] - src[ 9*src_stridea];
195 const float x0f = src[ 7*src_stridea] - src[ 8*src_stridea];
196 const float x10 = x00 + x07;
197 const float x11 = x01 + x06;
198 const float x12 = x02 + x05;
199 const float x13 = x03 + x04;
200 const float x14 = x00 - x07;
201 const float x15 = x01 - x06;
202 const float x16 = x02 - x05;
203 const float x17 = x03 - x04;
204 const float x18 = x10 + x13;
205 const float x19 = x11 + x12;
206 const float x1a = x10 - x13;
207 const float x1b = x11 - x12;
208 const float x1c = 1.38703984532215f*x14 + 0.275899379282943f*x17;
209 const float x1d = 1.17587560241936f*x15 + 0.785694958387102f*x16;
210 const float x1e = -0.785694958387102f*x15 + 1.17587560241936f *x16;
211 const float x1f = 0.275899379282943f*x14 - 1.38703984532215f *x17;
212 const float x20 = 0.25f * (x1c - x1d);
213 const float x21 = 0.25f * (x1e - x1f);
214 const float x22 = 1.40740373752638f *x08 + 0.138617169199091f*x0f;
215 const float x23 = 1.35331800117435f *x09 + 0.410524527522357f*x0e;
216 const float x24 = 1.24722501298667f *x0a + 0.666655658477747f*x0d;
217 const float x25 = 1.09320186700176f *x0b + 0.897167586342636f*x0c;
218 const float x26 = -0.897167586342636f*x0b + 1.09320186700176f *x0c;
219 const float x27 = 0.666655658477747f*x0a - 1.24722501298667f *x0d;
220 const float x28 = -0.410524527522357f*x09 + 1.35331800117435f *x0e;
221 const float x29 = 0.138617169199091f*x08 - 1.40740373752638f *x0f;
222 const float x2a = x22 + x25;
223 const float x2b = x23 + x24;
224 const float x2c = x22 - x25;
225 const float x2d = x23 - x24;
226 const float x2e = 0.25f * (x2a - x2b);
227 const float x2f = 0.326640741219094f*x2c + 0.135299025036549f*x2d;
228 const float x30 = 0.135299025036549f*x2c - 0.326640741219094f*x2d;
229 const float x31 = x26 + x29;
230 const float x32 = x27 + x28;
231 const float x33 = x26 - x29;
232 const float x34 = x27 - x28;
233 const float x35 = 0.25f * (x31 - x32);
234 const float x36 = 0.326640741219094f*x33 + 0.135299025036549f*x34;
235 const float x37 = 0.135299025036549f*x33 - 0.326640741219094f*x34;
236 dst[ 0*dst_stridea] = 0.25f * (x18 + x19);
237 dst[ 1*dst_stridea] = 0.25f * (x2a + x2b);
238 dst[ 2*dst_stridea] = 0.25f * (x1c + x1d);
239 dst[ 3*dst_stridea] = 0.707106781186547f * (x2f - x37);
240 dst[ 4*dst_stridea] = 0.326640741219094f*x1a + 0.135299025036549f*x1b;
241 dst[ 5*dst_stridea] = 0.707106781186547f * (x2f + x37);
242 dst[ 6*dst_stridea] = 0.707106781186547f * (x20 - x21);
243 dst[ 7*dst_stridea] = 0.707106781186547f * (x2e + x35);
244 dst[ 8*dst_stridea] = 0.25f * (x18 - x19);
245 dst[ 9*dst_stridea] = 0.707106781186547f * (x2e - x35);
246 dst[10*dst_stridea] = 0.707106781186547f * (x20 + x21);
247 dst[11*dst_stridea] = 0.707106781186547f * (x30 - x36);
248 dst[12*dst_stridea] = 0.135299025036549f*x1a - 0.326640741219094f*x1b;
249 dst[13*dst_stridea] = 0.707106781186547f * (x30 + x36);
250 dst[14*dst_stridea] = 0.25f * (x1e + x1f);
251 dst[15*dst_stridea] = 0.25f * (x31 + x32);
252 dst += dst_strideb;
253 src += src_strideb;
254 }
255}
256
257static void av_always_inline idct16_1d(float *dst, const float *src,
258 int dst_stridea, int dst_strideb,
259 int src_stridea, int src_strideb,
260 int add)
261{
262 int i;
263
264 for (i = 0; i < 16; i++) {
265 const float x00 = 1.4142135623731f *src[ 0*src_stridea];
266 const float x01 = 1.40740373752638f *src[ 1*src_stridea] + 0.138617169199091f*src[15*src_stridea];
267 const float x02 = 1.38703984532215f *src[ 2*src_stridea] + 0.275899379282943f*src[14*src_stridea];
268 const float x03 = 1.35331800117435f *src[ 3*src_stridea] + 0.410524527522357f*src[13*src_stridea];
269 const float x04 = 1.30656296487638f *src[ 4*src_stridea] + 0.541196100146197f*src[12*src_stridea];
270 const float x05 = 1.24722501298667f *src[ 5*src_stridea] + 0.666655658477747f*src[11*src_stridea];
271 const float x06 = 1.17587560241936f *src[ 6*src_stridea] + 0.785694958387102f*src[10*src_stridea];
272 const float x07 = 1.09320186700176f *src[ 7*src_stridea] + 0.897167586342636f*src[ 9*src_stridea];
273 const float x08 = 1.4142135623731f *src[ 8*src_stridea];
274 const float x09 = -0.897167586342636f*src[ 7*src_stridea] + 1.09320186700176f*src[ 9*src_stridea];
275 const float x0a = 0.785694958387102f*src[ 6*src_stridea] - 1.17587560241936f*src[10*src_stridea];
276 const float x0b = -0.666655658477747f*src[ 5*src_stridea] + 1.24722501298667f*src[11*src_stridea];
277 const float x0c = 0.541196100146197f*src[ 4*src_stridea] - 1.30656296487638f*src[12*src_stridea];
278 const float x0d = -0.410524527522357f*src[ 3*src_stridea] + 1.35331800117435f*src[13*src_stridea];
279 const float x0e = 0.275899379282943f*src[ 2*src_stridea] - 1.38703984532215f*src[14*src_stridea];
280 const float x0f = -0.138617169199091f*src[ 1*src_stridea] + 1.40740373752638f*src[15*src_stridea];
281 const float x12 = x00 + x08;
282 const float x13 = x01 + x07;
283 const float x14 = x02 + x06;
284 const float x15 = x03 + x05;
285 const float x16 = 1.4142135623731f*x04;
286 const float x17 = x00 - x08;
287 const float x18 = x01 - x07;
288 const float x19 = x02 - x06;
289 const float x1a = x03 - x05;
290 const float x1d = x12 + x16;
291 const float x1e = x13 + x15;
292 const float x1f = 1.4142135623731f*x14;
293 const float x20 = x12 - x16;
294 const float x21 = x13 - x15;
295 const float x22 = 0.25f * (x1d - x1f);
296 const float x23 = 0.25f * (x20 + x21);
297 const float x24 = 0.25f * (x20 - x21);
298 const float x25 = 1.4142135623731f*x17;
299 const float x26 = 1.30656296487638f*x18 + 0.541196100146197f*x1a;
300 const float x27 = 1.4142135623731f*x19;
301 const float x28 = -0.541196100146197f*x18 + 1.30656296487638f*x1a;
302 const float x29 = 0.176776695296637f * (x25 + x27) + 0.25f*x26;
303 const float x2a = 0.25f * (x25 - x27);
304 const float x2b = 0.176776695296637f * (x25 + x27) - 0.25f*x26;
305 const float x2c = 0.353553390593274f*x28;
306 const float x1b = 0.707106781186547f * (x2a - x2c);
307 const float x1c = 0.707106781186547f * (x2a + x2c);
308 const float x2d = 1.4142135623731f*x0c;
309 const float x2e = x0b + x0d;
310 const float x2f = x0a + x0e;
311 const float x30 = x09 + x0f;
312 const float x31 = x09 - x0f;
313 const float x32 = x0a - x0e;
314 const float x33 = x0b - x0d;
315 const float x37 = 1.4142135623731f*x2d;
316 const float x38 = 1.30656296487638f*x2e + 0.541196100146197f*x30;
317 const float x39 = 1.4142135623731f*x2f;
318 const float x3a = -0.541196100146197f*x2e + 1.30656296487638f*x30;
319 const float x3b = 0.176776695296637f * (x37 + x39) + 0.25f*x38;
320 const float x3c = 0.25f * (x37 - x39);
321 const float x3d = 0.176776695296637f * (x37 + x39) - 0.25f*x38;
322 const float x3e = 0.353553390593274f*x3a;
323 const float x34 = 0.707106781186547f * (x3c - x3e);
324 const float x35 = 0.707106781186547f * (x3c + x3e);
325 const float x3f = 1.4142135623731f*x32;
326 const float x40 = x31 + x33;
327 const float x41 = x31 - x33;
328 const float x42 = 0.25f * (x3f + x40);
329 const float x43 = 0.25f * (x3f - x40);
330 const float x44 = 0.353553390593274f*x41;
331 dst[ 0*dst_stridea] = (add ? dst[ 0*dst_stridea] : 0) + 0.176776695296637f * (x1d + x1f) + 0.25f*x1e;
332 dst[ 1*dst_stridea] = (add ? dst[ 1*dst_stridea] : 0) + 0.707106781186547f * (x29 + x3d);
333 dst[ 2*dst_stridea] = (add ? dst[ 2*dst_stridea] : 0) + 0.707106781186547f * (x29 - x3d);
334 dst[ 3*dst_stridea] = (add ? dst[ 3*dst_stridea] : 0) + 0.707106781186547f * (x23 - x43);
335 dst[ 4*dst_stridea] = (add ? dst[ 4*dst_stridea] : 0) + 0.707106781186547f * (x23 + x43);
336 dst[ 5*dst_stridea] = (add ? dst[ 5*dst_stridea] : 0) + 0.707106781186547f * (x1b - x35);
337 dst[ 6*dst_stridea] = (add ? dst[ 6*dst_stridea] : 0) + 0.707106781186547f * (x1b + x35);
338 dst[ 7*dst_stridea] = (add ? dst[ 7*dst_stridea] : 0) + 0.707106781186547f * (x22 + x44);
339 dst[ 8*dst_stridea] = (add ? dst[ 8*dst_stridea] : 0) + 0.707106781186547f * (x22 - x44);
340 dst[ 9*dst_stridea] = (add ? dst[ 9*dst_stridea] : 0) + 0.707106781186547f * (x1c + x34);
341 dst[10*dst_stridea] = (add ? dst[10*dst_stridea] : 0) + 0.707106781186547f * (x1c - x34);
342 dst[11*dst_stridea] = (add ? dst[11*dst_stridea] : 0) + 0.707106781186547f * (x24 + x42);
343 dst[12*dst_stridea] = (add ? dst[12*dst_stridea] : 0) + 0.707106781186547f * (x24 - x42);
344 dst[13*dst_stridea] = (add ? dst[13*dst_stridea] : 0) + 0.707106781186547f * (x2b - x3b);
345 dst[14*dst_stridea] = (add ? dst[14*dst_stridea] : 0) + 0.707106781186547f * (x2b + x3b);
346 dst[15*dst_stridea] = (add ? dst[15*dst_stridea] : 0) + 0.176776695296637f * (x1d + x1f) - 0.25f*x1e;
347 dst += dst_strideb;
348 src += src_strideb;
349 }
350}
351
352#define DEF_FILTER_FREQ_FUNCS(bsize) \
353static av_always_inline void filter_freq_##bsize(const float *src, int src_linesize, \
354 float *dst, int dst_linesize, \
355 AVExpr *expr, double *var_values, \
356 int sigma_th) \
357{ \
358 unsigned i; \
359 DECLARE_ALIGNED(32, float, tmp_block1)[bsize * bsize]; \
360 DECLARE_ALIGNED(32, float, tmp_block2)[bsize * bsize]; \
361 \
362 /* forward DCT */ \
363 fdct##bsize##_1d(tmp_block1, src, 1, bsize, 1, src_linesize); \
364 fdct##bsize##_1d(tmp_block2, tmp_block1, bsize, 1, bsize, 1); \
365 \
366 for (i = 0; i < bsize*bsize; i++) { \
367 float *b = &tmp_block2[i]; \
368 /* frequency filtering */ \
369 if (expr) { \
370 var_values[VAR_C] = FFABS(*b); \
371 *b *= av_expr_eval(expr, var_values, NULL); \
372 } else { \
373 if (FFABS(*b) < sigma_th) \
374 *b = 0; \
375 } \
376 } \
377 \
378 /* inverse DCT */ \
379 idct##bsize##_1d(tmp_block1, tmp_block2, 1, bsize, 1, bsize, 0); \
380 idct##bsize##_1d(dst, tmp_block1, dst_linesize, 1, bsize, 1, 1); \
381} \
382 \
383static void filter_freq_sigma_##bsize(DCTdnoizContext *s, \
384 const float *src, int src_linesize, \
385 float *dst, int dst_linesize, int thread_id) \
386{ \
387 filter_freq_##bsize(src, src_linesize, dst, dst_linesize, NULL, NULL, s->th); \
388} \
389 \
390static void filter_freq_expr_##bsize(DCTdnoizContext *s, \
391 const float *src, int src_linesize, \
392 float *dst, int dst_linesize, int thread_id) \
393{ \
394 filter_freq_##bsize(src, src_linesize, dst, dst_linesize, \
395 s->expr[thread_id], s->var_values[thread_id], 0); \
396}
397
398DEF_FILTER_FREQ_FUNCS(8)
399DEF_FILTER_FREQ_FUNCS(16)
400
401#define DCT3X3_0_0 0.5773502691896258f /* 1/sqrt(3) */
402#define DCT3X3_0_1 0.5773502691896258f /* 1/sqrt(3) */
403#define DCT3X3_0_2 0.5773502691896258f /* 1/sqrt(3) */
404#define DCT3X3_1_0 0.7071067811865475f /* 1/sqrt(2) */
405#define DCT3X3_1_2 -0.7071067811865475f /* -1/sqrt(2) */
406#define DCT3X3_2_0 0.4082482904638631f /* 1/sqrt(6) */
407#define DCT3X3_2_1 -0.8164965809277261f /* -2/sqrt(6) */
408#define DCT3X3_2_2 0.4082482904638631f /* 1/sqrt(6) */
409
410static av_always_inline void color_decorrelation(float **dst, int dst_linesize,
411 const uint8_t *src, int src_linesize,
412 int w, int h,
413 int r, int g, int b)
414{
415 int x, y;
416 float *dstp_r = dst[0];
417 float *dstp_g = dst[1];
418 float *dstp_b = dst[2];
419
420 for (y = 0; y < h; y++) {
421 const uint8_t *srcp = src;
422
423 for (x = 0; x < w; x++) {
424 dstp_r[x] = srcp[r] * DCT3X3_0_0 + srcp[g] * DCT3X3_0_1 + srcp[b] * DCT3X3_0_2;
425 dstp_g[x] = srcp[r] * DCT3X3_1_0 + srcp[b] * DCT3X3_1_2;
426 dstp_b[x] = srcp[r] * DCT3X3_2_0 + srcp[g] * DCT3X3_2_1 + srcp[b] * DCT3X3_2_2;
427 srcp += 3;
428 }
429 src += src_linesize;
430 dstp_r += dst_linesize;
431 dstp_g += dst_linesize;
432 dstp_b += dst_linesize;
433 }
434}
435
436static av_always_inline void color_correlation(uint8_t *dst, int dst_linesize,
437 float **src, int src_linesize,
438 int w, int h,
439 int r, int g, int b)
440{
441 int x, y;
442 const float *src_r = src[0];
443 const float *src_g = src[1];
444 const float *src_b = src[2];
445
446 for (y = 0; y < h; y++) {
447 uint8_t *dstp = dst;
448
449 for (x = 0; x < w; x++) {
450 dstp[r] = av_clip_uint8(src_r[x] * DCT3X3_0_0 + src_g[x] * DCT3X3_1_0 + src_b[x] * DCT3X3_2_0);
451 dstp[g] = av_clip_uint8(src_r[x] * DCT3X3_0_1 + src_b[x] * DCT3X3_2_1);
452 dstp[b] = av_clip_uint8(src_r[x] * DCT3X3_0_2 + src_g[x] * DCT3X3_1_2 + src_b[x] * DCT3X3_2_2);
453 dstp += 3;
454 }
455 dst += dst_linesize;
456 src_r += src_linesize;
457 src_g += src_linesize;
458 src_b += src_linesize;
459 }
460}
461
462#define DECLARE_COLOR_FUNCS(name, r, g, b) \
463static void color_decorrelation_##name(float **dst, int dst_linesize, \
464 const uint8_t *src, int src_linesize, \
465 int w, int h) \
466{ \
467 color_decorrelation(dst, dst_linesize, src, src_linesize, w, h, r, g, b); \
468} \
469 \
470static void color_correlation_##name(uint8_t *dst, int dst_linesize, \
471 float **src, int src_linesize, \
472 int w, int h) \
473{ \
474 color_correlation(dst, dst_linesize, src, src_linesize, w, h, r, g, b); \
475}
476
477DECLARE_COLOR_FUNCS(rgb, 0, 1, 2)
478DECLARE_COLOR_FUNCS(bgr, 2, 1, 0)
479
480static int config_input(AVFilterLink *inlink)
481{
482 AVFilterContext *ctx = inlink->dst;
483 DCTdnoizContext *s = ctx->priv;
484 int i, x, y, bx, by, linesize, *iweights, max_slice_h, slice_h;
485 const int bsize = 1 << s->n;
486
487 switch (inlink->format) {
488 case AV_PIX_FMT_BGR24:
489 s->color_decorrelation = color_decorrelation_bgr;
490 s->color_correlation = color_correlation_bgr;
491 break;
492 case AV_PIX_FMT_RGB24:
493 s->color_decorrelation = color_decorrelation_rgb;
494 s->color_correlation = color_correlation_rgb;
495 break;
496 default:
497 av_assert0(0);
498 }
499
500 s->pr_width = inlink->w - (inlink->w - bsize) % s->step;
501 s->pr_height = inlink->h - (inlink->h - bsize) % s->step;
502 if (s->pr_width != inlink->w)
503 av_log(ctx, AV_LOG_WARNING, "The last %d horizontal pixels won't be denoised\n",
504 inlink->w - s->pr_width);
505 if (s->pr_height != inlink->h)
506 av_log(ctx, AV_LOG_WARNING, "The last %d vertical pixels won't be denoised\n",
507 inlink->h - s->pr_height);
508
509 max_slice_h = s->pr_height / ((s->bsize - 1) * 2);
510 s->nb_threads = FFMIN3(MAX_THREADS, ctx->graph->nb_threads, max_slice_h);
511 av_log(ctx, AV_LOG_DEBUG, "threads: [max=%d hmax=%d user=%d] => %d\n",
512 MAX_THREADS, max_slice_h, ctx->graph->nb_threads, s->nb_threads);
513
514 s->p_linesize = linesize = FFALIGN(s->pr_width, 32);
515 for (i = 0; i < 2; i++) {
516 s->cbuf[i][0] = av_malloc(linesize * s->pr_height * sizeof(*s->cbuf[i][0]));
517 s->cbuf[i][1] = av_malloc(linesize * s->pr_height * sizeof(*s->cbuf[i][1]));
518 s->cbuf[i][2] = av_malloc(linesize * s->pr_height * sizeof(*s->cbuf[i][2]));
519 if (!s->cbuf[i][0] || !s->cbuf[i][1] || !s->cbuf[i][2])
520 return AVERROR(ENOMEM);
521 }
522
523 /* eval expressions are probably not thread safe when the eval internal
524 * state can be changed (typically through load & store operations) */
525 if (s->expr_str) {
526 for (i = 0; i < s->nb_threads; i++) {
527 int ret = av_expr_parse(&s->expr[i], s->expr_str, var_names,
528 NULL, NULL, NULL, NULL, 0, ctx);
529 if (ret < 0)
530 return ret;
531 }
532 }
533
534 /* each slice will need to (pre & re)process the top and bottom block of
535 * the previous one in in addition to its processing area. This is because
536 * each pixel is averaged by all the surrounding blocks */
537 slice_h = (int)ceilf(s->pr_height / s->nb_threads) + (s->bsize - 1) * 2;
538 for (i = 0; i < s->nb_threads; i++) {
539 s->slices[i] = av_malloc_array(linesize, slice_h * sizeof(*s->slices[i]));
540 if (!s->slices[i])
541 return AVERROR(ENOMEM);
542 }
543
544 s->weights = av_malloc(s->pr_height * linesize * sizeof(*s->weights));
545 if (!s->weights)
546 return AVERROR(ENOMEM);
547 iweights = av_calloc(s->pr_height, linesize * sizeof(*iweights));
548 if (!iweights)
549 return AVERROR(ENOMEM);
550 for (y = 0; y < s->pr_height - bsize + 1; y += s->step)
551 for (x = 0; x < s->pr_width - bsize + 1; x += s->step)
552 for (by = 0; by < bsize; by++)
553 for (bx = 0; bx < bsize; bx++)
554 iweights[(y + by)*linesize + x + bx]++;
555 for (y = 0; y < s->pr_height; y++)
556 for (x = 0; x < s->pr_width; x++)
557 s->weights[y*linesize + x] = 1. / iweights[y*linesize + x];
558 av_free(iweights);
559
560 return 0;
561}
562
563static av_cold int init(AVFilterContext *ctx)
564{
565 DCTdnoizContext *s = ctx->priv;
566
567 s->bsize = 1 << s->n;
568 if (s->overlap == -1)
569 s->overlap = s->bsize - 1;
570
571 if (s->overlap > s->bsize - 1) {
572 av_log(s, AV_LOG_ERROR, "Overlap value can not except %d "
573 "with a block size of %dx%d\n",
574 s->bsize - 1, s->bsize, s->bsize);
575 return AVERROR(EINVAL);
576 }
577
578 if (s->expr_str) {
579 switch (s->n) {
580 case 3: s->filter_freq_func = filter_freq_expr_8; break;
581 case 4: s->filter_freq_func = filter_freq_expr_16; break;
582 default: av_assert0(0);
583 }
584 } else {
585 switch (s->n) {
586 case 3: s->filter_freq_func = filter_freq_sigma_8; break;
587 case 4: s->filter_freq_func = filter_freq_sigma_16; break;
588 default: av_assert0(0);
589 }
590 }
591
592 s->th = s->sigma * 3.;
593 s->step = s->bsize - s->overlap;
594 return 0;
595}
596
597static int query_formats(AVFilterContext *ctx)
598{
599 static const enum AVPixelFormat pix_fmts[] = {
600 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
601 AV_PIX_FMT_NONE
602 };
603 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
604 return 0;
605}
606
607typedef struct ThreadData {
608 float *src, *dst;
609} ThreadData;
610
611static int filter_slice(AVFilterContext *ctx,
612 void *arg, int jobnr, int nb_jobs)
613{
614 int x, y;
615 DCTdnoizContext *s = ctx->priv;
616 const ThreadData *td = arg;
617 const int w = s->pr_width;
618 const int h = s->pr_height;
619 const int slice_start = (h * jobnr ) / nb_jobs;
620 const int slice_end = (h * (jobnr+1)) / nb_jobs;
621 const int slice_start_ctx = FFMAX(slice_start - s->bsize + 1, 0);
622 const int slice_end_ctx = FFMIN(slice_end, h - s->bsize + 1);
623 const int slice_h = slice_end_ctx - slice_start_ctx;
624 const int src_linesize = s->p_linesize;
625 const int dst_linesize = s->p_linesize;
626 const int slice_linesize = s->p_linesize;
627 float *dst;
628 const float *src = td->src + slice_start_ctx * src_linesize;
629 const float *weights = s->weights + slice_start * dst_linesize;
630 float *slice = s->slices[jobnr];
631
632 // reset block sums
633 memset(slice, 0, (slice_h + s->bsize - 1) * dst_linesize * sizeof(*slice));
634
635 // block dct sums
636 for (y = 0; y < slice_h; y += s->step) {
637 for (x = 0; x < w - s->bsize + 1; x += s->step)
638 s->filter_freq_func(s, src + x, src_linesize,
639 slice + x, slice_linesize,
640 jobnr);
641 src += s->step * src_linesize;
642 slice += s->step * slice_linesize;
643 }
644
645 // average blocks
646 slice = s->slices[jobnr] + (slice_start - slice_start_ctx) * slice_linesize;
647 dst = td->dst + slice_start * dst_linesize;
648 for (y = slice_start; y < slice_end; y++) {
649 for (x = 0; x < w; x++)
650 dst[x] = slice[x] * weights[x];
651 slice += slice_linesize;
652 dst += dst_linesize;
653 weights += dst_linesize;
654 }
655
656 return 0;
657}
658
659static int filter_frame(AVFilterLink *inlink, AVFrame *in)
660{
661 AVFilterContext *ctx = inlink->dst;
662 DCTdnoizContext *s = ctx->priv;
663 AVFilterLink *outlink = inlink->dst->outputs[0];
664 int direct, plane;
665 AVFrame *out;
666
667 if (av_frame_is_writable(in)) {
668 direct = 1;
669 out = in;
670 } else {
671 direct = 0;
672 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
673 if (!out) {
674 av_frame_free(&in);
675 return AVERROR(ENOMEM);
676 }
677 av_frame_copy_props(out, in);
678 }
679
680 s->color_decorrelation(s->cbuf[0], s->p_linesize,
681 in->data[0], in->linesize[0],
682 s->pr_width, s->pr_height);
683 for (plane = 0; plane < 3; plane++) {
684 ThreadData td = {
685 .src = s->cbuf[0][plane],
686 .dst = s->cbuf[1][plane],
687 };
688 ctx->internal->execute(ctx, filter_slice, &td, NULL, s->nb_threads);
689 }
690 s->color_correlation(out->data[0], out->linesize[0],
691 s->cbuf[1], s->p_linesize,
692 s->pr_width, s->pr_height);
693
694 if (!direct) {
695 int y;
696 uint8_t *dst = out->data[0];
697 const uint8_t *src = in->data[0];
698 const int dst_linesize = out->linesize[0];
699 const int src_linesize = in->linesize[0];
700 const int hpad = (inlink->w - s->pr_width) * 3;
701 const int vpad = (inlink->h - s->pr_height);
702
703 if (hpad) {
704 uint8_t *dstp = dst + s->pr_width * 3;
705 const uint8_t *srcp = src + s->pr_width * 3;
706
707 for (y = 0; y < s->pr_height; y++) {
708 memcpy(dstp, srcp, hpad);
709 dstp += dst_linesize;
710 srcp += src_linesize;
711 }
712 }
713 if (vpad) {
714 uint8_t *dstp = dst + s->pr_height * dst_linesize;
715 const uint8_t *srcp = src + s->pr_height * src_linesize;
716
717 for (y = 0; y < vpad; y++) {
718 memcpy(dstp, srcp, inlink->w * 3);
719 dstp += dst_linesize;
720 srcp += src_linesize;
721 }
722 }
723
724 av_frame_free(&in);
725 }
726
727 return ff_filter_frame(outlink, out);
728}
729
730static av_cold void uninit(AVFilterContext *ctx)
731{
732 int i;
733 DCTdnoizContext *s = ctx->priv;
734
735 av_free(s->weights);
736 for (i = 0; i < 2; i++) {
737 av_free(s->cbuf[i][0]);
738 av_free(s->cbuf[i][1]);
739 av_free(s->cbuf[i][2]);
740 }
741 for (i = 0; i < s->nb_threads; i++) {
742 av_free(s->slices[i]);
743 av_expr_free(s->expr[i]);
744 }
745}
746
747static const AVFilterPad dctdnoiz_inputs[] = {
748 {
749 .name = "default",
750 .type = AVMEDIA_TYPE_VIDEO,
751 .filter_frame = filter_frame,
752 .config_props = config_input,
753 },
754 { NULL }
755};
756
757static const AVFilterPad dctdnoiz_outputs[] = {
758 {
759 .name = "default",
760 .type = AVMEDIA_TYPE_VIDEO,
761 },
762 { NULL }
763};
764
765AVFilter ff_vf_dctdnoiz = {
766 .name = "dctdnoiz",
767 .description = NULL_IF_CONFIG_SMALL("Denoise frames using 2D DCT."),
768 .priv_size = sizeof(DCTdnoizContext),
769 .init = init,
770 .uninit = uninit,
771 .query_formats = query_formats,
772 .inputs = dctdnoiz_inputs,
773 .outputs = dctdnoiz_outputs,
774 .priv_class = &dctdnoiz_class,
775 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
776};
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