FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_smartblur.c
Date: 2022-11-26 13:19:19
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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 FilterParam {
46 float radius;
47 float strength;
48 int threshold;
49 float quality;
50 struct SwsContext *filter_context;
51 } FilterParam;
52
53 typedef struct SmartblurContext {
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 const enum AVPixelFormat pix_fmts[] = {
118 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
119 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
120 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
121 AV_PIX_FMT_GRAY8,
122 AV_PIX_FMT_NONE
123 };
124
125 static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags)
126 {
127 SwsVector *vec;
128 SwsFilter sws_filter;
129
130 vec = sws_getGaussianVec(f->radius, f->quality);
131
132 if (!vec)
133 return AVERROR(EINVAL);
134
135 sws_scaleVec(vec, f->strength);
136 vec->coeff[vec->length / 2] += 1.0 - f->strength;
137 sws_filter.lumH = sws_filter.lumV = vec;
138 sws_filter.chrH = sws_filter.chrV = NULL;
139 f->filter_context = sws_getCachedContext(NULL,
140 width, height, AV_PIX_FMT_GRAY8,
141 width, height, AV_PIX_FMT_GRAY8,
142 flags, &sws_filter, NULL, NULL);
143
144 sws_freeVec(vec);
145
146 if (!f->filter_context)
147 return AVERROR(EINVAL);
148
149 return 0;
150 }
151
152 static int config_props(AVFilterLink *inlink)
153 {
154 SmartblurContext *s = inlink->dst->priv;
155 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
156
157 s->hsub = desc->log2_chroma_w;
158 s->vsub = desc->log2_chroma_h;
159
160 alloc_sws_context(&s->luma, inlink->w, inlink->h, s->sws_flags);
161 alloc_sws_context(&s->chroma,
162 AV_CEIL_RSHIFT(inlink->w, s->hsub),
163 AV_CEIL_RSHIFT(inlink->h, s->vsub),
164 s->sws_flags);
165
166 return 0;
167 }
168
169 static void blur(uint8_t *dst, const int dst_linesize,
170 const uint8_t *src, const int src_linesize,
171 const int w, const int h, const int threshold,
172 struct SwsContext *filter_context)
173 {
174 int x, y;
175 int orig, filtered;
176 int diff;
177 /* Declare arrays of 4 to get aligned data */
178 const uint8_t* const src_array[4] = {src};
179 uint8_t *dst_array[4] = {dst};
180 int src_linesize_array[4] = {src_linesize};
181 int dst_linesize_array[4] = {dst_linesize};
182
183 sws_scale(filter_context, src_array, src_linesize_array,
184 0, h, dst_array, dst_linesize_array);
185
186 if (threshold > 0) {
187 for (y = 0; y < h; ++y) {
188 for (x = 0; x < w; ++x) {
189 orig = src[x + y * src_linesize];
190 filtered = dst[x + y * dst_linesize];
191 diff = orig - filtered;
192
193 if (diff > 0) {
194 if (diff > 2 * threshold)
195 dst[x + y * dst_linesize] = orig;
196 else if (diff > threshold)
197 /* add 'diff' and subtract 'threshold' from 'filtered' */
198 dst[x + y * dst_linesize] = orig - threshold;
199 } else {
200 if (-diff > 2 * threshold)
201 dst[x + y * dst_linesize] = orig;
202 else if (-diff > threshold)
203 /* add 'diff' and 'threshold' to 'filtered' */
204 dst[x + y * dst_linesize] = orig + threshold;
205 }
206 }
207 }
208 } else if (threshold < 0) {
209 for (y = 0; y < h; ++y) {
210 for (x = 0; x < w; ++x) {
211 orig = src[x + y * src_linesize];
212 filtered = dst[x + y * dst_linesize];
213 diff = orig - filtered;
214
215 if (diff > 0) {
216 if (diff <= -threshold)
217 dst[x + y * dst_linesize] = orig;
218 else if (diff <= -2 * threshold)
219 /* subtract 'diff' and 'threshold' from 'orig' */
220 dst[x + y * dst_linesize] = filtered - threshold;
221 } else {
222 if (diff >= threshold)
223 dst[x + y * dst_linesize] = orig;
224 else if (diff >= 2 * threshold)
225 /* add 'threshold' and subtract 'diff' from 'orig' */
226 dst[x + y * dst_linesize] = filtered + threshold;
227 }
228 }
229 }
230 }
231 }
232
233 static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
234 {
235 SmartblurContext *s = inlink->dst->priv;
236 AVFilterLink *outlink = inlink->dst->outputs[0];
237 AVFrame *outpic;
238 int cw = AV_CEIL_RSHIFT(inlink->w, s->hsub);
239 int ch = AV_CEIL_RSHIFT(inlink->h, s->vsub);
240
241 outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
242 if (!outpic) {
243 av_frame_free(&inpic);
244 return AVERROR(ENOMEM);
245 }
246 av_frame_copy_props(outpic, inpic);
247
248 blur(outpic->data[0], outpic->linesize[0],
249 inpic->data[0], inpic->linesize[0],
250 inlink->w, inlink->h, s->luma.threshold,
251 s->luma.filter_context);
252
253 if (inpic->data[2]) {
254 blur(outpic->data[1], outpic->linesize[1],
255 inpic->data[1], inpic->linesize[1],
256 cw, ch, s->chroma.threshold,
257 s->chroma.filter_context);
258 blur(outpic->data[2], outpic->linesize[2],
259 inpic->data[2], inpic->linesize[2],
260 cw, ch, s->chroma.threshold,
261 s->chroma.filter_context);
262 }
263
264 av_frame_free(&inpic);
265 return ff_filter_frame(outlink, outpic);
266 }
267
268 static const AVFilterPad smartblur_inputs[] = {
269 {
270 .name = "default",
271 .type = AVMEDIA_TYPE_VIDEO,
272 .filter_frame = filter_frame,
273 .config_props = config_props,
274 },
275 };
276
277 static const AVFilterPad smartblur_outputs[] = {
278 {
279 .name = "default",
280 .type = AVMEDIA_TYPE_VIDEO,
281 },
282 };
283
284 const AVFilter ff_vf_smartblur = {
285 .name = "smartblur",
286 .description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."),
287 .priv_size = sizeof(SmartblurContext),
288 .init = init,
289 .uninit = uninit,
290 FILTER_INPUTS(smartblur_inputs),
291 FILTER_OUTPUTS(smartblur_outputs),
292 FILTER_PIXFMTS_ARRAY(pix_fmts),
293 .priv_class = &smartblur_class,
294 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
295 };
296