教育部下发通知：2017年重点高校定向招收六万余

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