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1 | /* |
2 | * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (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 | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with FFmpeg; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | /** | |
22 | * @file | |
23 | * Shape Adaptive Blur filter, ported from MPlayer libmpcodecs/vf_sab.c | |
24 | */ | |
25 | ||
26 | #include "libavutil/opt.h" | |
27 | #include "libavutil/pixdesc.h" | |
28 | #include "libswscale/swscale.h" | |
29 | ||
30 | #include "avfilter.h" | |
31 | #include "formats.h" | |
32 | #include "internal.h" | |
33 | ||
34 | typedef struct { | |
35 | float radius; | |
36 | float pre_filter_radius; | |
37 | float strength; | |
38 | float quality; | |
39 | struct SwsContext *pre_filter_context; | |
40 | uint8_t *pre_filter_buf; | |
41 | int pre_filter_linesize; | |
42 | int dist_width; | |
43 | int dist_linesize; | |
44 | int *dist_coeff; | |
45 | #define COLOR_DIFF_COEFF_SIZE 512 | |
46 | int color_diff_coeff[COLOR_DIFF_COEFF_SIZE]; | |
47 | } FilterParam; | |
48 | ||
49 | typedef struct { | |
50 | const AVClass *class; | |
51 | FilterParam luma; | |
52 | FilterParam chroma; | |
53 | int hsub; | |
54 | int vsub; | |
55 | unsigned int sws_flags; | |
56 | } SabContext; | |
57 | ||
58 | static int query_formats(AVFilterContext *ctx) | |
59 | { | |
60 | static const enum AVPixelFormat pix_fmts[] = { | |
61 | AV_PIX_FMT_YUV420P, | |
62 | AV_PIX_FMT_YUV410P, | |
63 | AV_PIX_FMT_YUV444P, | |
64 | AV_PIX_FMT_YUV422P, | |
65 | AV_PIX_FMT_YUV411P, | |
66 | AV_PIX_FMT_NONE | |
67 | }; | |
68 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | #define RADIUS_MIN 0.1 | |
74 | #define RADIUS_MAX 4.0 | |
75 | ||
76 | #define PRE_FILTER_RADIUS_MIN 0.1 | |
77 | #define PRE_FILTER_RADIUS_MAX 2.0 | |
78 | ||
79 | #define STRENGTH_MIN 0.1 | |
80 | #define STRENGTH_MAX 100.0 | |
81 | ||
82 | #define OFFSET(x) offsetof(SabContext, x) | |
83 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM | |
84 | ||
85 | static const AVOption sab_options[] = { | |
86 | { "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, | |
87 | { "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, | |
88 | { "luma_pre_filter_radius", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, | |
89 | { "lpfr", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, | |
90 | { "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, | |
91 | { "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, | |
92 | ||
93 | { "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, | |
94 | { "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, | |
95 | { "chroma_pre_filter_radius", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1}, | |
96 | PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, | |
97 | { "cpfr", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1}, | |
98 | PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, | |
99 | { "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, | |
100 | { "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, | |
101 | ||
102 | { NULL } | |
103 | }; | |
104 | ||
105 | AVFILTER_DEFINE_CLASS(sab); | |
106 | ||
107 | static av_cold int init(AVFilterContext *ctx) | |
108 | { | |
109 | SabContext *sab = ctx->priv; | |
110 | ||
111 | /* make chroma default to luma values, if not explicitly set */ | |
112 | if (sab->chroma.radius < RADIUS_MIN) | |
113 | sab->chroma.radius = sab->luma.radius; | |
114 | if (sab->chroma.pre_filter_radius < PRE_FILTER_RADIUS_MIN) | |
115 | sab->chroma.pre_filter_radius = sab->luma.pre_filter_radius; | |
116 | if (sab->chroma.strength < STRENGTH_MIN) | |
117 | sab->chroma.strength = sab->luma.strength; | |
118 | ||
119 | sab->luma.quality = sab->chroma.quality = 3.0; | |
120 | sab->sws_flags = SWS_POINT; | |
121 | ||
122 | av_log(ctx, AV_LOG_VERBOSE, | |
123 | "luma_radius:%f luma_pre_filter_radius::%f luma_strength:%f " | |
124 | "chroma_radius:%f chroma_pre_filter_radius:%f chroma_strength:%f\n", | |
125 | sab->luma .radius, sab->luma .pre_filter_radius, sab->luma .strength, | |
126 | sab->chroma.radius, sab->chroma.pre_filter_radius, sab->chroma.strength); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static void close_filter_param(FilterParam *f) | |
131 | { | |
132 | if (f->pre_filter_context) { | |
133 | sws_freeContext(f->pre_filter_context); | |
134 | f->pre_filter_context = NULL; | |
135 | } | |
136 | av_freep(&f->pre_filter_buf); | |
137 | av_freep(&f->dist_coeff); | |
138 | } | |
139 | ||
140 | static av_cold void uninit(AVFilterContext *ctx) | |
141 | { | |
142 | SabContext *sab = ctx->priv; | |
143 | ||
144 | close_filter_param(&sab->luma); | |
145 | close_filter_param(&sab->chroma); | |
146 | } | |
147 | ||
148 | static int open_filter_param(FilterParam *f, int width, int height, unsigned int sws_flags) | |
149 | { | |
150 | SwsVector *vec; | |
151 | SwsFilter sws_f; | |
152 | int i, x, y; | |
153 | int linesize = FFALIGN(width, 8); | |
154 | ||
155 | f->pre_filter_buf = av_malloc(linesize * height); | |
156 | if (!f->pre_filter_buf) | |
157 | return AVERROR(ENOMEM); | |
158 | ||
159 | f->pre_filter_linesize = linesize; | |
160 | vec = sws_getGaussianVec(f->pre_filter_radius, f->quality); | |
161 | sws_f.lumH = sws_f.lumV = vec; | |
162 | sws_f.chrH = sws_f.chrV = NULL; | |
163 | f->pre_filter_context = sws_getContext(width, height, AV_PIX_FMT_GRAY8, | |
164 | width, height, AV_PIX_FMT_GRAY8, | |
165 | sws_flags, &sws_f, NULL, NULL); | |
166 | sws_freeVec(vec); | |
167 | ||
168 | vec = sws_getGaussianVec(f->strength, 5.0); | |
169 | for (i = 0; i < COLOR_DIFF_COEFF_SIZE; i++) { | |
170 | double d; | |
171 | int index = i-COLOR_DIFF_COEFF_SIZE/2 + vec->length/2; | |
172 | ||
173 | if (index < 0 || index >= vec->length) d = 0.0; | |
174 | else d = vec->coeff[index]; | |
175 | ||
176 | f->color_diff_coeff[i] = (int)(d/vec->coeff[vec->length/2]*(1<<12) + 0.5); | |
177 | } | |
178 | sws_freeVec(vec); | |
179 | ||
180 | vec = sws_getGaussianVec(f->radius, f->quality); | |
181 | f->dist_width = vec->length; | |
182 | f->dist_linesize = FFALIGN(vec->length, 8); | |
183 | f->dist_coeff = av_malloc_array(f->dist_width, f->dist_linesize * sizeof(*f->dist_coeff)); | |
184 | if (!f->dist_coeff) { | |
185 | sws_freeVec(vec); | |
186 | return AVERROR(ENOMEM); | |
187 | } | |
188 | ||
189 | for (y = 0; y < vec->length; y++) { | |
190 | for (x = 0; x < vec->length; x++) { | |
191 | double d = vec->coeff[x] * vec->coeff[y]; | |
192 | f->dist_coeff[x + y*f->dist_linesize] = (int)(d*(1<<10) + 0.5); | |
193 | } | |
194 | } | |
195 | sws_freeVec(vec); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static int config_props(AVFilterLink *inlink) | |
201 | { | |
202 | SabContext *sab = inlink->dst->priv; | |
203 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); | |
204 | int ret; | |
205 | ||
206 | sab->hsub = desc->log2_chroma_w; | |
207 | sab->vsub = desc->log2_chroma_h; | |
208 | ||
209 | close_filter_param(&sab->luma); | |
210 | ret = open_filter_param(&sab->luma, inlink->w, inlink->h, sab->sws_flags); | |
211 | if (ret < 0) | |
212 | return ret; | |
213 | ||
214 | close_filter_param(&sab->chroma); | |
215 | ret = open_filter_param(&sab->chroma, | |
216 | FF_CEIL_RSHIFT(inlink->w, sab->hsub), | |
217 | FF_CEIL_RSHIFT(inlink->h, sab->vsub), sab->sws_flags); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | #define NB_PLANES 4 | |
222 | ||
223 | static void blur(uint8_t *dst, const int dst_linesize, | |
224 | const uint8_t *src, const int src_linesize, | |
225 | const int w, const int h, FilterParam *fp) | |
226 | { | |
227 | int x, y; | |
228 | FilterParam f = *fp; | |
229 | const int radius = f.dist_width/2; | |
230 | ||
231 | const uint8_t * const src2[NB_PLANES] = { src }; | |
232 | int src2_linesize[NB_PLANES] = { src_linesize }; | |
233 | uint8_t *dst2[NB_PLANES] = { f.pre_filter_buf }; | |
234 | int dst2_linesize[NB_PLANES] = { f.pre_filter_linesize }; | |
235 | ||
236 | sws_scale(f.pre_filter_context, src2, src2_linesize, 0, h, dst2, dst2_linesize); | |
237 | ||
238 | #define UPDATE_FACTOR do { \ | |
239 | int factor; \ | |
240 | factor = f.color_diff_coeff[COLOR_DIFF_COEFF_SIZE/2 + pre_val - \ | |
241 | f.pre_filter_buf[ix + iy*f.pre_filter_linesize]] * f.dist_coeff[dx + dy*f.dist_linesize]; \ | |
242 | sum += src[ix + iy*src_linesize] * factor; \ | |
243 | div += factor; \ | |
244 | } while (0) | |
245 | ||
246 | for (y = 0; y < h; y++) { | |
247 | for (x = 0; x < w; x++) { | |
248 | int sum = 0; | |
249 | int div = 0; | |
250 | int dy; | |
251 | const int pre_val = f.pre_filter_buf[x + y*f.pre_filter_linesize]; | |
252 | if (x >= radius && x < w - radius) { | |
253 | for (dy = 0; dy < radius*2 + 1; dy++) { | |
254 | int dx; | |
255 | int iy = y+dy - radius; | |
256 | if (iy < 0) iy = -iy; | |
257 | else if (iy >= h) iy = h+h-iy-1; | |
258 | ||
259 | for (dx = 0; dx < radius*2 + 1; dx++) { | |
260 | const int ix = x+dx - radius; | |
261 | UPDATE_FACTOR; | |
262 | } | |
263 | } | |
264 | } else { | |
265 | for (dy = 0; dy < radius*2+1; dy++) { | |
266 | int dx; | |
267 | int iy = y+dy - radius; | |
268 | if (iy < 0) iy = -iy; | |
269 | else if (iy >= h) iy = h+h-iy-1; | |
270 | ||
271 | for (dx = 0; dx < radius*2 + 1; dx++) { | |
272 | int ix = x+dx - radius; | |
273 | if (ix < 0) ix = -ix; | |
274 | else if (ix >= w) ix = w+w-ix-1; | |
275 | UPDATE_FACTOR; | |
276 | } | |
277 | } | |
278 | } | |
279 | dst[x + y*dst_linesize] = (sum + div/2) / div; | |
280 | } | |
281 | } | |
282 | } | |
283 | ||
284 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) | |
285 | { | |
286 | SabContext *sab = inlink->dst->priv; | |
287 | AVFilterLink *outlink = inlink->dst->outputs[0]; | |
288 | AVFrame *outpic; | |
289 | ||
290 | outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); | |
291 | if (!outpic) { | |
292 | av_frame_free(&inpic); | |
293 | return AVERROR(ENOMEM); | |
294 | } | |
295 | av_frame_copy_props(outpic, inpic); | |
296 | ||
297 | blur(outpic->data[0], outpic->linesize[0], inpic->data[0], inpic->linesize[0], | |
298 | inlink->w, inlink->h, &sab->luma); | |
299 | if (inpic->data[2]) { | |
300 | int cw = FF_CEIL_RSHIFT(inlink->w, sab->hsub); | |
301 | int ch = FF_CEIL_RSHIFT(inlink->h, sab->vsub); | |
302 | blur(outpic->data[1], outpic->linesize[1], inpic->data[1], inpic->linesize[1], cw, ch, &sab->chroma); | |
303 | blur(outpic->data[2], outpic->linesize[2], inpic->data[2], inpic->linesize[2], cw, ch, &sab->chroma); | |
304 | } | |
305 | ||
306 | av_frame_free(&inpic); | |
307 | return ff_filter_frame(outlink, outpic); | |
308 | } | |
309 | ||
310 | static const AVFilterPad sab_inputs[] = { | |
311 | { | |
312 | .name = "default", | |
313 | .type = AVMEDIA_TYPE_VIDEO, | |
314 | .filter_frame = filter_frame, | |
315 | .config_props = config_props, | |
316 | }, | |
317 | { NULL } | |
318 | }; | |
319 | ||
320 | static const AVFilterPad sab_outputs[] = { | |
321 | { | |
322 | .name = "default", | |
323 | .type = AVMEDIA_TYPE_VIDEO, | |
324 | }, | |
325 | { NULL } | |
326 | }; | |
327 | ||
328 | AVFilter ff_vf_sab = { | |
329 | .name = "sab", | |
330 | .description = NULL_IF_CONFIG_SMALL("Apply shape adaptive blur."), | |
331 | .priv_size = sizeof(SabContext), | |
332 | .init = init, | |
333 | .uninit = uninit, | |
334 | .query_formats = query_formats, | |
335 | .inputs = sab_inputs, | |
336 | .outputs = sab_outputs, | |
337 | .priv_class = &sab_class, | |
338 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | |
339 | }; |