blob: 117e0ec6018549e9bea87ca9a50854caf4220714
1 | /* |
2 | * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> |
3 | * Copyright (c) 2012 Jeremy Tran |
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 | * @file |
24 | * Apply a smartblur filter to the input video |
25 | * Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer. |
26 | */ |
27 | |
28 | #include "libavutil/opt.h" |
29 | #include "libavutil/pixdesc.h" |
30 | #include "libswscale/swscale.h" |
31 | |
32 | #include "avfilter.h" |
33 | #include "formats.h" |
34 | #include "internal.h" |
35 | |
36 | #define RADIUS_MIN 0.1 |
37 | #define RADIUS_MAX 5.0 |
38 | |
39 | #define STRENGTH_MIN -1.0 |
40 | #define STRENGTH_MAX 1.0 |
41 | |
42 | #define THRESHOLD_MIN -30 |
43 | #define THRESHOLD_MAX 30 |
44 | |
45 | typedef struct { |
46 | float radius; |
47 | float strength; |
48 | int threshold; |
49 | float quality; |
50 | struct SwsContext *filter_context; |
51 | } FilterParam; |
52 | |
53 | typedef struct { |
54 | const AVClass *class; |
55 | FilterParam luma; |
56 | FilterParam chroma; |
57 | int hsub; |
58 | int vsub; |
59 | unsigned int sws_flags; |
60 | } SmartblurContext; |
61 | |
62 | #define OFFSET(x) offsetof(SmartblurContext, x) |
63 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
64 | |
65 | static const AVOption smartblur_options[] = { |
66 | { "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
67 | { "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
68 | { "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
69 | { "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
70 | { "luma_threshold", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS }, |
71 | { "lt", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS }, |
72 | |
73 | { "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
74 | { "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
75 | { "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
76 | { "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
77 | { "chroma_threshold", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS }, |
78 | { "ct", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS }, |
79 | |
80 | { NULL } |
81 | }; |
82 | |
83 | AVFILTER_DEFINE_CLASS(smartblur); |
84 | |
85 | static av_cold int init(AVFilterContext *ctx) |
86 | { |
87 | SmartblurContext *s = ctx->priv; |
88 | |
89 | /* make chroma default to luma values, if not explicitly set */ |
90 | if (s->chroma.radius < RADIUS_MIN) |
91 | s->chroma.radius = s->luma.radius; |
92 | if (s->chroma.strength < STRENGTH_MIN) |
93 | s->chroma.strength = s->luma.strength; |
94 | if (s->chroma.threshold < THRESHOLD_MIN) |
95 | s->chroma.threshold = s->luma.threshold; |
96 | |
97 | s->luma.quality = s->chroma.quality = 3.0; |
98 | s->sws_flags = SWS_BICUBIC; |
99 | |
100 | av_log(ctx, AV_LOG_VERBOSE, |
101 | "luma_radius:%f luma_strength:%f luma_threshold:%d " |
102 | "chroma_radius:%f chroma_strength:%f chroma_threshold:%d\n", |
103 | s->luma.radius, s->luma.strength, s->luma.threshold, |
104 | s->chroma.radius, s->chroma.strength, s->chroma.threshold); |
105 | |
106 | return 0; |
107 | } |
108 | |
109 | static av_cold void uninit(AVFilterContext *ctx) |
110 | { |
111 | SmartblurContext *s = ctx->priv; |
112 | |
113 | sws_freeContext(s->luma.filter_context); |
114 | sws_freeContext(s->chroma.filter_context); |
115 | } |
116 | |
117 | static int query_formats(AVFilterContext *ctx) |
118 | { |
119 | static const enum AVPixelFormat pix_fmts[] = { |
120 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, |
121 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, |
122 | AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, |
123 | AV_PIX_FMT_GRAY8, |
124 | AV_PIX_FMT_NONE |
125 | }; |
126 | |
127 | AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); |
128 | if (!fmts_list) |
129 | return AVERROR(ENOMEM); |
130 | return ff_set_common_formats(ctx, fmts_list); |
131 | } |
132 | |
133 | static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags) |
134 | { |
135 | SwsVector *vec; |
136 | SwsFilter sws_filter; |
137 | |
138 | vec = sws_getGaussianVec(f->radius, f->quality); |
139 | |
140 | if (!vec) |
141 | return AVERROR(EINVAL); |
142 | |
143 | sws_scaleVec(vec, f->strength); |
144 | vec->coeff[vec->length / 2] += 1.0 - f->strength; |
145 | sws_filter.lumH = sws_filter.lumV = vec; |
146 | sws_filter.chrH = sws_filter.chrV = NULL; |
147 | f->filter_context = sws_getCachedContext(NULL, |
148 | width, height, AV_PIX_FMT_GRAY8, |
149 | width, height, AV_PIX_FMT_GRAY8, |
150 | flags, &sws_filter, NULL, NULL); |
151 | |
152 | sws_freeVec(vec); |
153 | |
154 | if (!f->filter_context) |
155 | return AVERROR(EINVAL); |
156 | |
157 | return 0; |
158 | } |
159 | |
160 | static int config_props(AVFilterLink *inlink) |
161 | { |
162 | SmartblurContext *s = inlink->dst->priv; |
163 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
164 | |
165 | s->hsub = desc->log2_chroma_w; |
166 | s->vsub = desc->log2_chroma_h; |
167 | |
168 | alloc_sws_context(&s->luma, inlink->w, inlink->h, s->sws_flags); |
169 | alloc_sws_context(&s->chroma, |
170 | AV_CEIL_RSHIFT(inlink->w, s->hsub), |
171 | AV_CEIL_RSHIFT(inlink->h, s->vsub), |
172 | s->sws_flags); |
173 | |
174 | return 0; |
175 | } |
176 | |
177 | static void blur(uint8_t *dst, const int dst_linesize, |
178 | const uint8_t *src, const int src_linesize, |
179 | const int w, const int h, const int threshold, |
180 | struct SwsContext *filter_context) |
181 | { |
182 | int x, y; |
183 | int orig, filtered; |
184 | int diff; |
185 | /* Declare arrays of 4 to get aligned data */ |
186 | const uint8_t* const src_array[4] = {src}; |
187 | uint8_t *dst_array[4] = {dst}; |
188 | int src_linesize_array[4] = {src_linesize}; |
189 | int dst_linesize_array[4] = {dst_linesize}; |
190 | |
191 | sws_scale(filter_context, src_array, src_linesize_array, |
192 | 0, h, dst_array, dst_linesize_array); |
193 | |
194 | if (threshold > 0) { |
195 | for (y = 0; y < h; ++y) { |
196 | for (x = 0; x < w; ++x) { |
197 | orig = src[x + y * src_linesize]; |
198 | filtered = dst[x + y * dst_linesize]; |
199 | diff = orig - filtered; |
200 | |
201 | if (diff > 0) { |
202 | if (diff > 2 * threshold) |
203 | dst[x + y * dst_linesize] = orig; |
204 | else if (diff > threshold) |
205 | /* add 'diff' and subtract 'threshold' from 'filtered' */ |
206 | dst[x + y * dst_linesize] = orig - threshold; |
207 | } else { |
208 | if (-diff > 2 * threshold) |
209 | dst[x + y * dst_linesize] = orig; |
210 | else if (-diff > threshold) |
211 | /* add 'diff' and 'threshold' to 'filtered' */ |
212 | dst[x + y * dst_linesize] = orig + threshold; |
213 | } |
214 | } |
215 | } |
216 | } else if (threshold < 0) { |
217 | for (y = 0; y < h; ++y) { |
218 | for (x = 0; x < w; ++x) { |
219 | orig = src[x + y * src_linesize]; |
220 | filtered = dst[x + y * dst_linesize]; |
221 | diff = orig - filtered; |
222 | |
223 | if (diff > 0) { |
224 | if (diff <= -threshold) |
225 | dst[x + y * dst_linesize] = orig; |
226 | else if (diff <= -2 * threshold) |
227 | /* subtract 'diff' and 'threshold' from 'orig' */ |
228 | dst[x + y * dst_linesize] = filtered - threshold; |
229 | } else { |
230 | if (diff >= threshold) |
231 | dst[x + y * dst_linesize] = orig; |
232 | else if (diff >= 2 * threshold) |
233 | /* add 'threshold' and subtract 'diff' from 'orig' */ |
234 | dst[x + y * dst_linesize] = filtered + threshold; |
235 | } |
236 | } |
237 | } |
238 | } |
239 | } |
240 | |
241 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) |
242 | { |
243 | SmartblurContext *s = inlink->dst->priv; |
244 | AVFilterLink *outlink = inlink->dst->outputs[0]; |
245 | AVFrame *outpic; |
246 | int cw = AV_CEIL_RSHIFT(inlink->w, s->hsub); |
247 | int ch = AV_CEIL_RSHIFT(inlink->h, s->vsub); |
248 | |
249 | outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
250 | if (!outpic) { |
251 | av_frame_free(&inpic); |
252 | return AVERROR(ENOMEM); |
253 | } |
254 | av_frame_copy_props(outpic, inpic); |
255 | |
256 | blur(outpic->data[0], outpic->linesize[0], |
257 | inpic->data[0], inpic->linesize[0], |
258 | inlink->w, inlink->h, s->luma.threshold, |
259 | s->luma.filter_context); |
260 | |
261 | if (inpic->data[2]) { |
262 | blur(outpic->data[1], outpic->linesize[1], |
263 | inpic->data[1], inpic->linesize[1], |
264 | cw, ch, s->chroma.threshold, |
265 | s->chroma.filter_context); |
266 | blur(outpic->data[2], outpic->linesize[2], |
267 | inpic->data[2], inpic->linesize[2], |
268 | cw, ch, s->chroma.threshold, |
269 | s->chroma.filter_context); |
270 | } |
271 | |
272 | av_frame_free(&inpic); |
273 | return ff_filter_frame(outlink, outpic); |
274 | } |
275 | |
276 | static const AVFilterPad smartblur_inputs[] = { |
277 | { |
278 | .name = "default", |
279 | .type = AVMEDIA_TYPE_VIDEO, |
280 | .filter_frame = filter_frame, |
281 | .config_props = config_props, |
282 | }, |
283 | { NULL } |
284 | }; |
285 | |
286 | static const AVFilterPad smartblur_outputs[] = { |
287 | { |
288 | .name = "default", |
289 | .type = AVMEDIA_TYPE_VIDEO, |
290 | }, |
291 | { NULL } |
292 | }; |
293 | |
294 | AVFilter ff_vf_smartblur = { |
295 | .name = "smartblur", |
296 | .description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."), |
297 | .priv_size = sizeof(SmartblurContext), |
298 | .init = init, |
299 | .uninit = uninit, |
300 | .query_formats = query_formats, |
301 | .inputs = smartblur_inputs, |
302 | .outputs = smartblur_outputs, |
303 | .priv_class = &smartblur_class, |
304 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
305 | }; |
306 |