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path: root/libavfilter/vf_neighbor.c (plain)
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1/*
2 * Copyright (c) 2012-2013 Oka Motofumi (chikuzen.mo at gmail dot com)
3 * Copyright (c) 2015 Paul B Mahol
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (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 GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "libavutil/imgutils.h"
23#include "libavutil/pixdesc.h"
24#include "libavutil/opt.h"
25#include "avfilter.h"
26#include "formats.h"
27#include "internal.h"
28#include "video.h"
29
30typedef struct NContext {
31 const AVClass *class;
32 int planeheight[4];
33 int planewidth[4];
34 int nb_planes;
35 int threshold[4];
36 int coordinates;
37 uint8_t *buffer;
38
39 void (*filter)(uint8_t *dst, const uint8_t *p1, int width,
40 int threshold, const uint8_t *coordinates[], int coord);
41} NContext;
42
43static int query_formats(AVFilterContext *ctx)
44{
45 static const enum AVPixelFormat pix_fmts[] = {
46 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
47 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
48 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
49 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
50 };
51
52 return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
53}
54
55static av_cold void uninit(AVFilterContext *ctx)
56{
57 NContext *s = ctx->priv;
58
59 av_freep(&s->buffer);
60}
61
62static inline void line_copy8(uint8_t *line, const uint8_t *srcp, int width, int mergin)
63{
64 int i;
65
66 memcpy(line, srcp, width);
67
68 for (i = mergin; i > 0; i--) {
69 line[-i] = line[i];
70 line[width - 1 + i] = line[width - 1 - i];
71 }
72}
73
74static void erosion(uint8_t *dst, const uint8_t *p1, int width,
75 int threshold, const uint8_t *coordinates[], int coord)
76{
77 int x, i;
78
79 for (x = 0; x < width; x++) {
80 int min = p1[x];
81 int limit = FFMAX(min - threshold, 0);
82
83 for (i = 0; i < 8; i++) {
84 if (coord & (1 << i)) {
85 min = FFMIN(min, *(coordinates[i] + x));
86 }
87 min = FFMAX(min, limit);
88 }
89
90 dst[x] = min;
91 }
92}
93
94static void dilation(uint8_t *dst, const uint8_t *p1, int width,
95 int threshold, const uint8_t *coordinates[], int coord)
96{
97 int x, i;
98
99 for (x = 0; x < width; x++) {
100 int max = p1[x];
101 int limit = FFMIN(max + threshold, 255);
102
103 for (i = 0; i < 8; i++) {
104 if (coord & (1 << i)) {
105 max = FFMAX(max, *(coordinates[i] + x));
106 }
107 max = FFMIN(max, limit);
108 }
109
110 dst[x] = max;
111 }
112}
113
114static void deflate(uint8_t *dst, const uint8_t *p1, int width,
115 int threshold, const uint8_t *coordinates[], int coord)
116{
117 int x, i;
118
119 for (x = 0; x < width; x++) {
120 int sum = 0;
121 int limit = FFMAX(p1[x] - threshold, 0);
122
123 for (i = 0; i < 8; sum += *(coordinates[i++] + x));
124
125 dst[x] = FFMAX(FFMIN(sum / 8, p1[x]), limit);
126 }
127}
128
129static void inflate(uint8_t *dst, const uint8_t *p1, int width,
130 int threshold, const uint8_t *coordinates[], int coord)
131{
132 int x, i;
133
134 for (x = 0; x < width; x++) {
135 int sum = 0;
136 int limit = FFMIN(p1[x] + threshold, 255);
137
138 for (i = 0; i < 8; sum += *(coordinates[i++] + x));
139
140 dst[x] = FFMIN(FFMAX(sum / 8, p1[x]), limit);
141 }
142}
143
144static int config_input(AVFilterLink *inlink)
145{
146 AVFilterContext *ctx = inlink->dst;
147 NContext *s = ctx->priv;
148 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
149 int ret;
150
151 if ((ret = av_image_fill_linesizes(s->planewidth, inlink->format, inlink->w)) < 0)
152 return ret;
153
154 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
155 s->planeheight[0] = s->planeheight[3] = inlink->h;
156
157 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
158 s->buffer = av_malloc(3 * (s->planewidth[0] + 32));
159 if (!s->buffer)
160 return AVERROR(ENOMEM);
161
162 if (!strcmp(ctx->filter->name, "erosion"))
163 s->filter = erosion;
164 else if (!strcmp(ctx->filter->name, "dilation"))
165 s->filter = dilation;
166 else if (!strcmp(ctx->filter->name, "deflate"))
167 s->filter = deflate;
168 else if (!strcmp(ctx->filter->name, "inflate"))
169 s->filter = inflate;
170
171 return 0;
172}
173
174static int filter_frame(AVFilterLink *inlink, AVFrame *in)
175{
176 AVFilterContext *ctx = inlink->dst;
177 AVFilterLink *outlink = ctx->outputs[0];
178 NContext *s = ctx->priv;
179 AVFrame *out;
180 int plane, y;
181
182 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
183 if (!out) {
184 av_frame_free(&in);
185 return AVERROR(ENOMEM);
186 }
187 av_frame_copy_props(out, in);
188
189 for (plane = 0; plane < s->nb_planes; plane++) {
190 const int threshold = s->threshold[plane];
191
192 if (threshold) {
193 const uint8_t *src = in->data[plane];
194 uint8_t *dst = out->data[plane];
195 int stride = in->linesize[plane];
196 int height = s->planeheight[plane];
197 int width = s->planewidth[plane];
198 uint8_t *p0 = s->buffer + 16;
199 uint8_t *p1 = p0 + s->planewidth[0];
200 uint8_t *p2 = p1 + s->planewidth[0];
201 uint8_t *orig = p0, *end = p2;
202
203 line_copy8(p0, src + stride, width, 1);
204 line_copy8(p1, src, width, 1);
205
206 for (y = 0; y < height; y++) {
207 const uint8_t *coordinates[] = { p0 - 1, p0, p0 + 1,
208 p1 - 1, p1 + 1,
209 p2 - 1, p2, p2 + 1};
210 src += stride * (y < height - 1 ? 1 : -1);
211 line_copy8(p2, src, width, 1);
212
213 s->filter(dst, p1, width, threshold, coordinates, s->coordinates);
214
215 p0 = p1;
216 p1 = p2;
217 p2 = (p2 == end) ? orig: p2 + s->planewidth[0];
218 dst += out->linesize[plane];
219 }
220 } else {
221 av_image_copy_plane(out->data[plane], out->linesize[plane],
222 in->data[plane], in->linesize[plane],
223 s->planewidth[plane], s->planeheight[plane]);
224 }
225 }
226
227 av_frame_free(&in);
228 return ff_filter_frame(outlink, out);
229}
230
231static const AVFilterPad neighbor_inputs[] = {
232 {
233 .name = "default",
234 .type = AVMEDIA_TYPE_VIDEO,
235 .filter_frame = filter_frame,
236 .config_props = config_input,
237 },
238 { NULL }
239};
240
241static const AVFilterPad neighbor_outputs[] = {
242 {
243 .name = "default",
244 .type = AVMEDIA_TYPE_VIDEO,
245 },
246 { NULL }
247};
248
249#define OFFSET(x) offsetof(NContext, x)
250#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
251
252#define DEFINE_NEIGHBOR_FILTER(name_, description_) \
253AVFILTER_DEFINE_CLASS(name_); \
254 \
255AVFilter ff_vf_##name_ = { \
256 .name = #name_, \
257 .description = NULL_IF_CONFIG_SMALL(description_), \
258 .priv_size = sizeof(NContext), \
259 .priv_class = &name_##_class, \
260 .uninit = uninit, \
261 .query_formats = query_formats, \
262 .inputs = neighbor_inputs, \
263 .outputs = neighbor_outputs, \
264 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, \
265}
266
267#if CONFIG_EROSION_FILTER
268
269static const AVOption erosion_options[] = {
270 { "threshold0", "set threshold for 1st plane", OFFSET(threshold[0]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
271 { "threshold1", "set threshold for 2nd plane", OFFSET(threshold[1]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
272 { "threshold2", "set threshold for 3rd plane", OFFSET(threshold[2]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
273 { "threshold3", "set threshold for 4th plane", OFFSET(threshold[3]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
274 { "coordinates", "set coordinates", OFFSET(coordinates), AV_OPT_TYPE_INT, {.i64=255}, 0, 255, FLAGS },
275 { NULL }
276};
277
278DEFINE_NEIGHBOR_FILTER(erosion, "Apply erosion effect.");
279
280#endif /* CONFIG_EROSION_FILTER */
281
282#if CONFIG_DILATION_FILTER
283
284static const AVOption dilation_options[] = {
285 { "threshold0", "set threshold for 1st plane", OFFSET(threshold[0]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
286 { "threshold1", "set threshold for 2nd plane", OFFSET(threshold[1]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
287 { "threshold2", "set threshold for 3rd plane", OFFSET(threshold[2]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
288 { "threshold3", "set threshold for 4th plane", OFFSET(threshold[3]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
289 { "coordinates", "set coordinates", OFFSET(coordinates), AV_OPT_TYPE_INT, {.i64=255}, 0, 255, FLAGS },
290 { NULL }
291};
292
293DEFINE_NEIGHBOR_FILTER(dilation, "Apply dilation effect.");
294
295#endif /* CONFIG_DILATION_FILTER */
296
297#if CONFIG_DEFLATE_FILTER
298
299static const AVOption deflate_options[] = {
300 { "threshold0", "set threshold for 1st plane", OFFSET(threshold[0]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
301 { "threshold1", "set threshold for 2nd plane", OFFSET(threshold[1]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
302 { "threshold2", "set threshold for 3rd plane", OFFSET(threshold[2]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
303 { "threshold3", "set threshold for 4th plane", OFFSET(threshold[3]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
304 { NULL }
305};
306
307DEFINE_NEIGHBOR_FILTER(deflate, "Apply deflate effect.");
308
309#endif /* CONFIG_DEFLATE_FILTER */
310
311#if CONFIG_INFLATE_FILTER
312
313static const AVOption inflate_options[] = {
314 { "threshold0", "set threshold for 1st plane", OFFSET(threshold[0]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
315 { "threshold1", "set threshold for 2nd plane", OFFSET(threshold[1]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
316 { "threshold2", "set threshold for 3rd plane", OFFSET(threshold[2]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
317 { "threshold3", "set threshold for 4th plane", OFFSET(threshold[3]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
318 { NULL }
319};
320
321DEFINE_NEIGHBOR_FILTER(inflate, "Apply inflate effect.");
322
323#endif /* CONFIG_INFLATE_FILTER */
324
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