1 /*
2 * Copyright (c) 2021 Paul B Mahol
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 #include <float.h>
22
23 #include "libavutil/opt.h"
24 #include "libavutil/imgutils.h"
25 #include "avfilter.h"
26 #include "formats.h"
27 #include "internal.h"
28 #include "video.h"
29
30 typedef struct MonochromeContext {
31 const AVClass *class;
32
33 float b, r;
34 float size;
35 float high;
36
37 int depth;
38 int subw, subh;
39
40 int (*do_slice)(AVFilterContext *s, void *arg,
41 int jobnr, int nb_jobs);
42 int (*clear_uv)(AVFilterContext *s, void *arg,
43 int jobnr, int nb_jobs);
44 } MonochromeContext;
45
envelope(const float x)46 static float envelope(const float x)
47 {
48 const float beta = 0.6f;
49
50 if (x < beta) {
51 const float tmp = fabsf(x / beta - 1.f);
52
53 return 1.f - tmp * tmp;
54 } else {
55 const float tmp = (1.f - x) / (1.f - beta);
56
57 return tmp * tmp * (3.f - 2.f * tmp);
58 }
59 }
60
filter(float b,float r,float u,float v,float size)61 static float filter(float b, float r, float u, float v, float size)
62 {
63 return expf(-av_clipf(((b - u) * (b - u) +
64 (r - v) * (r - v)) *
65 size, 0.f, 1.f));
66 }
67
68 #define PROCESS() \
69 const int cx = x >> subw; \
70 float y = yptr[x] * imax; \
71 float u = uptr[cx] * imax - .5f; \
72 float v = vptr[cx] * imax - .5f; \
73 float tt, t, ny; \
74 \
75 ny = filter(b, r, u, v, size); \
76 tt = envelope(y); \
77 t = tt + (1.f - tt) * ihigh; \
78 ny = (1.f - t) * y + t * ny * y;
79
monochrome_slice8(AVFilterContext * ctx,void * arg,int jobnr,int nb_jobs)80 static int monochrome_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
81 {
82 MonochromeContext *s = ctx->priv;
83 AVFrame *frame = arg;
84 const int depth = s->depth;
85 const int subw = s->subw;
86 const int subh = s->subh;
87 const float max = (1 << depth) - 1;
88 const float imax = 1.f / max;
89 const int width = frame->width;
90 const int height = frame->height;
91 const int slice_start = (height * jobnr) / nb_jobs;
92 const int slice_end = (height * (jobnr + 1)) / nb_jobs;
93 const int ylinesize = frame->linesize[0];
94 const int ulinesize = frame->linesize[1];
95 const int vlinesize = frame->linesize[2];
96 uint8_t *yptr = frame->data[0] + slice_start * ylinesize;
97 const float ihigh = 1.f - s->high;
98 const float size = 1.f / s->size;
99 const float b = s->b * .5f;
100 const float r = s->r * .5f;
101
102 for (int y = slice_start; y < slice_end; y++) {
103 const int cy = y >> subh;
104 uint8_t *uptr = frame->data[1] + cy * ulinesize;
105 uint8_t *vptr = frame->data[2] + cy * vlinesize;
106
107 for (int x = 0; x < width; x++) {
108 PROCESS()
109
110 yptr[x] = av_clip_uint8(lrintf(ny * max));
111 }
112
113 yptr += ylinesize;
114 }
115
116 return 0;
117 }
118
monochrome_slice16(AVFilterContext * ctx,void * arg,int jobnr,int nb_jobs)119 static int monochrome_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
120 {
121 MonochromeContext *s = ctx->priv;
122 AVFrame *frame = arg;
123 const int depth = s->depth;
124 const int subw = s->subw;
125 const int subh = s->subh;
126 const float max = (1 << depth) - 1;
127 const float imax = 1.f / max;
128 const int width = frame->width;
129 const int height = frame->height;
130 const int slice_start = (height * jobnr) / nb_jobs;
131 const int slice_end = (height * (jobnr + 1)) / nb_jobs;
132 const int ylinesize = frame->linesize[0] / 2;
133 const int ulinesize = frame->linesize[1] / 2;
134 const int vlinesize = frame->linesize[2] / 2;
135 uint16_t *yptr = (uint16_t *)frame->data[0] + slice_start * ylinesize;
136 const float ihigh = 1.f - s->high;
137 const float size = 1.f / s->size;
138 const float b = s->b * .5f;
139 const float r = s->r * .5f;
140
141 for (int y = slice_start; y < slice_end; y++) {
142 const int cy = y >> subh;
143 uint16_t *uptr = (uint16_t *)frame->data[1] + cy * ulinesize;
144 uint16_t *vptr = (uint16_t *)frame->data[2] + cy * vlinesize;
145
146 for (int x = 0; x < width; x++) {
147 PROCESS()
148
149 yptr[x] = av_clip_uintp2_c(lrintf(ny * max), depth);
150 }
151
152 yptr += ylinesize;
153 }
154
155 return 0;
156 }
157
clear_slice8(AVFilterContext * ctx,void * arg,int jobnr,int nb_jobs)158 static int clear_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
159 {
160 MonochromeContext *s = ctx->priv;
161 AVFrame *frame = arg;
162 const int depth = s->depth;
163 const int half = 1 << (depth - 1);
164 const int subw = s->subw;
165 const int subh = s->subh;
166 const int width = AV_CEIL_RSHIFT(frame->width, subw);
167 const int height = AV_CEIL_RSHIFT(frame->height, subh);
168 const int slice_start = (height * jobnr) / nb_jobs;
169 const int slice_end = (height * (jobnr + 1)) / nb_jobs;
170 const int ulinesize = frame->linesize[1];
171 const int vlinesize = frame->linesize[2];
172
173 for (int y = slice_start; y < slice_end; y++) {
174 uint8_t *uptr = frame->data[1] + y * ulinesize;
175 uint8_t *vptr = frame->data[2] + y * vlinesize;
176
177 memset(uptr, half, width);
178 memset(vptr, half, width);
179 }
180
181 return 0;
182 }
183
clear_slice16(AVFilterContext * ctx,void * arg,int jobnr,int nb_jobs)184 static int clear_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
185 {
186 MonochromeContext *s = ctx->priv;
187 AVFrame *frame = arg;
188 const int depth = s->depth;
189 const int half = 1 << (depth - 1);
190 const int subw = s->subw;
191 const int subh = s->subh;
192 const int width = AV_CEIL_RSHIFT(frame->width, subw);
193 const int height = AV_CEIL_RSHIFT(frame->height, subh);
194 const int slice_start = (height * jobnr) / nb_jobs;
195 const int slice_end = (height * (jobnr + 1)) / nb_jobs;
196 const int ulinesize = frame->linesize[1] / 2;
197 const int vlinesize = frame->linesize[2] / 2;
198
199 for (int y = slice_start; y < slice_end; y++) {
200 uint16_t *uptr = (uint16_t *)frame->data[1] + y * ulinesize;
201 uint16_t *vptr = (uint16_t *)frame->data[2] + y * vlinesize;
202
203 for (int x = 0; x < width; x++) {
204 uptr[x] = half;
205 vptr[x] = half;
206 }
207 }
208
209 return 0;
210 }
211
filter_frame(AVFilterLink * inlink,AVFrame * frame)212 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
213 {
214 AVFilterContext *ctx = inlink->dst;
215 MonochromeContext *s = ctx->priv;
216
217 ff_filter_execute(ctx, s->do_slice, frame, NULL,
218 FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
219 ff_filter_execute(ctx, s->clear_uv, frame, NULL,
220 FFMIN(frame->height >> s->subh, ff_filter_get_nb_threads(ctx)));
221
222 return ff_filter_frame(ctx->outputs[0], frame);
223 }
224
225 static const enum AVPixelFormat pixel_fmts[] = {
226 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
227 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
228 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
229 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
230 AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
231 AV_PIX_FMT_YUVJ411P,
232 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
233 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
234 AV_PIX_FMT_YUV440P10,
235 AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
236 AV_PIX_FMT_YUV440P12,
237 AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
238 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
239 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
240 AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
241 AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
242 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
243 AV_PIX_FMT_NONE
244 };
245
config_input(AVFilterLink * inlink)246 static av_cold int config_input(AVFilterLink *inlink)
247 {
248 AVFilterContext *ctx = inlink->dst;
249 MonochromeContext *s = ctx->priv;
250 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
251
252 s->depth = desc->comp[0].depth;
253 s->do_slice = s->depth <= 8 ? monochrome_slice8 : monochrome_slice16;
254 s->clear_uv = s->depth <= 8 ? clear_slice8 : clear_slice16;
255 s->subw = desc->log2_chroma_w;
256 s->subh = desc->log2_chroma_h;
257
258 return 0;
259 }
260
261 static const AVFilterPad monochrome_inputs[] = {
262 {
263 .name = "default",
264 .type = AVMEDIA_TYPE_VIDEO,
265 .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
266 .filter_frame = filter_frame,
267 .config_props = config_input,
268 },
269 };
270
271 static const AVFilterPad monochrome_outputs[] = {
272 {
273 .name = "default",
274 .type = AVMEDIA_TYPE_VIDEO,
275 },
276 };
277
278 #define OFFSET(x) offsetof(MonochromeContext, x)
279 #define VF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
280
281 static const AVOption monochrome_options[] = {
282 { "cb", "set the chroma blue spot", OFFSET(b), AV_OPT_TYPE_FLOAT, {.dbl=0},-1, 1, VF },
283 { "cr", "set the chroma red spot", OFFSET(r), AV_OPT_TYPE_FLOAT, {.dbl=0},-1, 1, VF },
284 { "size", "set the color filter size", OFFSET(size), AV_OPT_TYPE_FLOAT, {.dbl=1},.1,10, VF },
285 { "high", "set the highlights strength", OFFSET(high), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, VF },
286 { NULL }
287 };
288
289 AVFILTER_DEFINE_CLASS(monochrome);
290
291 const AVFilter ff_vf_monochrome = {
292 .name = "monochrome",
293 .description = NULL_IF_CONFIG_SMALL("Convert video to gray using custom color filter."),
294 .priv_size = sizeof(MonochromeContext),
295 .priv_class = &monochrome_class,
296 FILTER_INPUTS(monochrome_inputs),
297 FILTER_OUTPUTS(monochrome_outputs),
298 FILTER_PIXFMTS_ARRAY(pixel_fmts),
299 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
300 .process_command = ff_filter_process_command,
301 };
302