1 /*
2 * Copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at>
3 * Copyright (c) 2013 Clément Bœsch <u pkh me>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (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
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 */
21
22 /**
23 * @todo try to change to int
24 * @todo try lifting based implementation
25 * @todo optimize optimize optimize
26 * @todo hard thresholding
27 * @todo use QP to decide filter strength
28 * @todo wavelet normalization / least squares optimal signal vs. noise thresholds
29 */
30
31 #include "libavutil/imgutils.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/pixdesc.h"
34 #include "avfilter.h"
35 #include "internal.h"
36
37 typedef struct {
38 const AVClass *class;
39 double luma_strength;
40 double chroma_strength;
41 int depth;
42 float *plane[16+1][4];
43 int linesize;
44 int hsub, vsub;
45 } OWDenoiseContext;
46
47 #define OFFSET(x) offsetof(OWDenoiseContext, x)
48 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
49 static const AVOption owdenoise_options[] = {
50 { "depth", "set depth", OFFSET(depth), AV_OPT_TYPE_INT, {.i64 = 8}, 8, 16, FLAGS },
51 { "luma_strength", "set luma strength", OFFSET(luma_strength), AV_OPT_TYPE_DOUBLE, {.dbl = 1.0}, 0, 1000, FLAGS },
52 { "ls", "set luma strength", OFFSET(luma_strength), AV_OPT_TYPE_DOUBLE, {.dbl = 1.0}, 0, 1000, FLAGS },
53 { "chroma_strength", "set chroma strength", OFFSET(chroma_strength), AV_OPT_TYPE_DOUBLE, {.dbl = 1.0}, 0, 1000, FLAGS },
54 { "cs", "set chroma strength", OFFSET(chroma_strength), AV_OPT_TYPE_DOUBLE, {.dbl = 1.0}, 0, 1000, FLAGS },
55 { NULL }
56 };
57
58 AVFILTER_DEFINE_CLASS(owdenoise);
59
60 DECLARE_ALIGNED(8, static const uint8_t, dither)[8][8] = {
61 { 0, 48, 12, 60, 3, 51, 15, 63 },
62 { 32, 16, 44, 28, 35, 19, 47, 31 },
63 { 8, 56, 4, 52, 11, 59, 7, 55 },
64 { 40, 24, 36, 20, 43, 27, 39, 23 },
65 { 2, 50, 14, 62, 1, 49, 13, 61 },
66 { 34, 18, 46, 30, 33, 17, 45, 29 },
67 { 10, 58, 6, 54, 9, 57, 5, 53 },
68 { 42, 26, 38, 22, 41, 25, 37, 21 },
69 };
70
71 static const double coeff[2][5] = {
72 {
73 0.6029490182363579 * M_SQRT2,
74 0.2668641184428723 * M_SQRT2,
75 -0.07822326652898785 * M_SQRT2,
76 -0.01686411844287495 * M_SQRT2,
77 0.02674875741080976 * M_SQRT2,
78 },{
79 1.115087052456994 / M_SQRT2,
80 -0.5912717631142470 / M_SQRT2,
81 -0.05754352622849957 / M_SQRT2,
82 0.09127176311424948 / M_SQRT2,
83 }
84 };
85
86 static const double icoeff[2][5] = {
87 {
88 1.115087052456994 / M_SQRT2,
89 0.5912717631142470 / M_SQRT2,
90 -0.05754352622849957 / M_SQRT2,
91 -0.09127176311424948 / M_SQRT2,
92 },{
93 0.6029490182363579 * M_SQRT2,
94 -0.2668641184428723 * M_SQRT2,
95 -0.07822326652898785 * M_SQRT2,
96 0.01686411844287495 * M_SQRT2,
97 0.02674875741080976 * M_SQRT2,
98 }
99 };
100
mirror(int x,int w)101 static inline int mirror(int x, int w)
102 {
103 while ((unsigned)x > (unsigned)w) {
104 x = -x;
105 if (x < 0)
106 x += 2 * w;
107 }
108 return x;
109 }
110
decompose(float * dst_l,float * dst_h,const float * src,int linesize,int w)111 static inline void decompose(float *dst_l, float *dst_h, const float *src,
112 int linesize, int w)
113 {
114 int x, i;
115 for (x = 0; x < w; x++) {
116 double sum_l = src[x * linesize] * coeff[0][0];
117 double sum_h = src[x * linesize] * coeff[1][0];
118 for (i = 1; i <= 4; i++) {
119 const double s = src[mirror(x - i, w - 1) * linesize]
120 + src[mirror(x + i, w - 1) * linesize];
121
122 sum_l += coeff[0][i] * s;
123 sum_h += coeff[1][i] * s;
124 }
125 dst_l[x * linesize] = sum_l;
126 dst_h[x * linesize] = sum_h;
127 }
128 }
129
compose(float * dst,const float * src_l,const float * src_h,int linesize,int w)130 static inline void compose(float *dst, const float *src_l, const float *src_h,
131 int linesize, int w)
132 {
133 int x, i;
134 for (x = 0; x < w; x++) {
135 double sum_l = src_l[x * linesize] * icoeff[0][0];
136 double sum_h = src_h[x * linesize] * icoeff[1][0];
137 for (i = 1; i <= 4; i++) {
138 const int x0 = mirror(x - i, w - 1) * linesize;
139 const int x1 = mirror(x + i, w - 1) * linesize;
140
141 sum_l += icoeff[0][i] * (src_l[x0] + src_l[x1]);
142 sum_h += icoeff[1][i] * (src_h[x0] + src_h[x1]);
143 }
144 dst[x * linesize] = (sum_l + sum_h) * 0.5;
145 }
146 }
147
decompose2D(float * dst_l,float * dst_h,const float * src,int xlinesize,int ylinesize,int step,int w,int h)148 static inline void decompose2D(float *dst_l, float *dst_h, const float *src,
149 int xlinesize, int ylinesize,
150 int step, int w, int h)
151 {
152 int y, x;
153 for (y = 0; y < h; y++)
154 for (x = 0; x < step; x++)
155 decompose(dst_l + ylinesize*y + xlinesize*x,
156 dst_h + ylinesize*y + xlinesize*x,
157 src + ylinesize*y + xlinesize*x,
158 step * xlinesize, (w - x + step - 1) / step);
159 }
160
compose2D(float * dst,const float * src_l,const float * src_h,int xlinesize,int ylinesize,int step,int w,int h)161 static inline void compose2D(float *dst, const float *src_l, const float *src_h,
162 int xlinesize, int ylinesize,
163 int step, int w, int h)
164 {
165 int y, x;
166 for (y = 0; y < h; y++)
167 for (x = 0; x < step; x++)
168 compose(dst + ylinesize*y + xlinesize*x,
169 src_l + ylinesize*y + xlinesize*x,
170 src_h + ylinesize*y + xlinesize*x,
171 step * xlinesize, (w - x + step - 1) / step);
172 }
173
decompose2D2(float * dst[4],float * src,float * temp[2],int linesize,int step,int w,int h)174 static void decompose2D2(float *dst[4], float *src, float *temp[2],
175 int linesize, int step, int w, int h)
176 {
177 decompose2D(temp[0], temp[1], src, 1, linesize, step, w, h);
178 decompose2D( dst[0], dst[1], temp[0], linesize, 1, step, h, w);
179 decompose2D( dst[2], dst[3], temp[1], linesize, 1, step, h, w);
180 }
181
compose2D2(float * dst,float * src[4],float * temp[2],int linesize,int step,int w,int h)182 static void compose2D2(float *dst, float *src[4], float *temp[2],
183 int linesize, int step, int w, int h)
184 {
185 compose2D(temp[0], src[0], src[1], linesize, 1, step, h, w);
186 compose2D(temp[1], src[2], src[3], linesize, 1, step, h, w);
187 compose2D(dst, temp[0], temp[1], 1, linesize, step, w, h);
188 }
189
filter(OWDenoiseContext * s,uint8_t * dst,int dst_linesize,const uint8_t * src,int src_linesize,int width,int height,double strength)190 static void filter(OWDenoiseContext *s,
191 uint8_t *dst, int dst_linesize,
192 const uint8_t *src, int src_linesize,
193 int width, int height, double strength)
194 {
195 int x, y, i, j, depth = s->depth;
196
197 while (1<<depth > width || 1<<depth > height)
198 depth--;
199
200 for (y = 0; y < height; y++)
201 for(x = 0; x < width; x++)
202 s->plane[0][0][y*s->linesize + x] = src[y*src_linesize + x];
203
204 for (i = 0; i < depth; i++)
205 decompose2D2(s->plane[i + 1], s->plane[i][0], s->plane[0] + 1, s->linesize, 1<<i, width, height);
206
207 for (i = 0; i < depth; i++) {
208 for (j = 1; j < 4; j++) {
209 for (y = 0; y < height; y++) {
210 for (x = 0; x < width; x++) {
211 double v = s->plane[i + 1][j][y*s->linesize + x];
212 if (v > strength) v -= strength;
213 else if (v < -strength) v += strength;
214 else v = 0;
215 s->plane[i + 1][j][x + y*s->linesize] = v;
216 }
217 }
218 }
219 }
220 for (i = depth-1; i >= 0; i--)
221 compose2D2(s->plane[i][0], s->plane[i + 1], s->plane[0] + 1, s->linesize, 1<<i, width, height);
222
223 for (y = 0; y < height; y++) {
224 for (x = 0; x < width; x++) {
225 i = s->plane[0][0][y*s->linesize + x] + dither[x&7][y&7]*(1.0/64) + 1.0/128; // yes the rounding is insane but optimal :)
226 if ((unsigned)i > 255U) i = ~(i >> 31);
227 dst[y*dst_linesize + x] = i;
228 }
229 }
230 }
231
filter_frame(AVFilterLink * inlink,AVFrame * in)232 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
233 {
234 int direct = 0;
235 AVFilterContext *ctx = inlink->dst;
236 OWDenoiseContext *s = ctx->priv;
237 AVFilterLink *outlink = ctx->outputs[0];
238 AVFrame *out;
239 const int cw = FF_CEIL_RSHIFT(inlink->w, s->hsub);
240 const int ch = FF_CEIL_RSHIFT(inlink->h, s->vsub);
241
242 if (av_frame_is_writable(in)) {
243 direct = 1;
244 out = in;
245 } else {
246 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
247 if (!out) {
248 av_frame_free(&in);
249 return AVERROR(ENOMEM);
250 }
251 av_frame_copy_props(out, in);
252 }
253
254 filter(s, out->data[0], out->linesize[0], in->data[0], in->linesize[0], inlink->w, inlink->h, s->luma_strength);
255 filter(s, out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw, ch, s->chroma_strength);
256 filter(s, out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw, ch, s->chroma_strength);
257
258 if (!direct) {
259 if (in->data[3])
260 av_image_copy_plane(out->data[3], out->linesize[3],
261 in ->data[3], in ->linesize[3],
262 inlink->w, inlink->h);
263 av_frame_free(&in);
264 }
265
266 return ff_filter_frame(outlink, out);
267 }
268
query_formats(AVFilterContext * ctx)269 static int query_formats(AVFilterContext *ctx)
270 {
271 static const enum AVPixelFormat pix_fmts[] = {
272 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
273 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
274 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
275 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P,
276 AV_PIX_FMT_YUVA420P,
277 AV_PIX_FMT_NONE
278 };
279 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
280 return 0;
281 }
282
config_input(AVFilterLink * inlink)283 static int config_input(AVFilterLink *inlink)
284 {
285 int i, j;
286 OWDenoiseContext *s = inlink->dst->priv;
287 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
288 const int h = FFALIGN(inlink->h, 16);
289
290 s->hsub = desc->log2_chroma_w;
291 s->vsub = desc->log2_chroma_h;
292
293 s->linesize = FFALIGN(inlink->w, 16);
294 for (j = 0; j < 4; j++) {
295 for (i = 0; i <= s->depth; i++) {
296 s->plane[i][j] = av_malloc_array(s->linesize, h * sizeof(s->plane[0][0][0]));
297 if (!s->plane[i][j])
298 return AVERROR(ENOMEM);
299 }
300 }
301 return 0;
302 }
303
uninit(AVFilterContext * ctx)304 static av_cold void uninit(AVFilterContext *ctx)
305 {
306 int i, j;
307 OWDenoiseContext *s = ctx->priv;
308
309 for (j = 0; j < 4; j++)
310 for (i = 0; i <= s->depth; i++)
311 av_freep(&s->plane[i][j]);
312 }
313
314 static const AVFilterPad owdenoise_inputs[] = {
315 {
316 .name = "default",
317 .type = AVMEDIA_TYPE_VIDEO,
318 .filter_frame = filter_frame,
319 .config_props = config_input,
320 },
321 { NULL }
322 };
323
324 static const AVFilterPad owdenoise_outputs[] = {
325 {
326 .name = "default",
327 .type = AVMEDIA_TYPE_VIDEO,
328 },
329 { NULL }
330 };
331
332 AVFilter ff_vf_owdenoise = {
333 .name = "owdenoise",
334 .description = NULL_IF_CONFIG_SMALL("Denoise using wavelets."),
335 .priv_size = sizeof(OWDenoiseContext),
336 .uninit = uninit,
337 .query_formats = query_formats,
338 .inputs = owdenoise_inputs,
339 .outputs = owdenoise_outputs,
340 .priv_class = &owdenoise_class,
341 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
342 };
343