FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vsrc_life.c
Date: 2025-10-29 00:48:36
Exec Total Coverage
Lines: 115 189 60.8%
Functions: 8 10 80.0%
Branches: 100 190 52.6%
Line Branch Exec Source
1 /*
2 * Copyright (c) Stefano Sabatini 2010
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 /**
22 * @file
23 * life video source, based on John Conways' Life Game
24 */
25
26 /* #define DEBUG */
27
28 #include "libavutil/file.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/lfg.h"
32 #include "libavutil/mem.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/random_seed.h"
35 #include "libavutil/avstring.h"
36 #include "avfilter.h"
37 #include "filters.h"
38 #include "formats.h"
39 #include "video.h"
40
41 typedef struct LifeContext {
42 const AVClass *class;
43 int w, h;
44 char *filename;
45 char *rule_str;
46 uint8_t *file_buf;
47 size_t file_bufsize;
48
49 /**
50 * The two grid state buffers.
51 *
52 * A 0xFF (ALIVE_CELL) value means the cell is alive (or new born), while
53 * the decreasing values from 0xFE to 0 means the cell is dead; the range
54 * of values is used for the slow death effect, or mold (0xFE means dead,
55 * 0xFD means very dead, 0xFC means very very dead... and 0x00 means
56 * definitely dead/mold).
57 */
58 uint8_t *buf[2];
59
60 uint8_t buf_idx;
61 uint16_t stay_rule; ///< encode the behavior for filled cells
62 uint16_t born_rule; ///< encode the behavior for empty cells
63 uint64_t pts;
64 AVRational frame_rate;
65 double random_fill_ratio;
66 int64_t random_seed;
67 int stitch;
68 int mold;
69 uint8_t life_color[4];
70 uint8_t death_color[4];
71 uint8_t mold_color[4];
72 AVLFG lfg;
73 void (*draw)(AVFilterContext*, AVFrame*);
74 } LifeContext;
75
76 #define ALIVE_CELL 0xFF
77 #define OFFSET(x) offsetof(LifeContext, x)
78 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
79
80 static const AVOption life_options[] = {
81 { "filename", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
82 { "f", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
83 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
84 { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
85 { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
86 { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
87 { "rule", "set rule", OFFSET(rule_str), AV_OPT_TYPE_STRING, {.str = "B3/S23"}, 0, 0, FLAGS },
88 { "random_fill_ratio", "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1/M_PHI}, 0, 1, FLAGS },
89 { "ratio", "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1/M_PHI}, 0, 1, FLAGS },
90 { "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT32_MAX, FLAGS },
91 { "seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT32_MAX, FLAGS },
92 { "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
93 { "mold", "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.i64=0}, 0, 0xFF, FLAGS },
94 { "life_color", "set life color", OFFSET( life_color), AV_OPT_TYPE_COLOR, {.str="white"}, 0, 0, FLAGS },
95 { "death_color", "set death color", OFFSET(death_color), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS },
96 { "mold_color", "set mold color", OFFSET( mold_color), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS },
97 { NULL }
98 };
99
100 AVFILTER_DEFINE_CLASS(life);
101
102 1 static int parse_rule(uint16_t *born_rule, uint16_t *stay_rule,
103 const char *rule_str, void *log_ctx)
104 {
105 char *tail;
106 1 const char *p = rule_str;
107 1 *born_rule = 0;
108 1 *stay_rule = 0;
109
110
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 1 if (strchr("bBsS", *p)) {
111 /* parse rule as a Born / Stay Alive code, see
112 * http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life */
113 do {
114
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 2 uint16_t *rule = (*p == 'b' || *p == 'B') ? born_rule : stay_rule;
115 2 p++;
116
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 5 while (*p >= '0' && *p <= '8') {
117 3 *rule += 1<<(*p - '0');
118 3 p++;
119 }
120
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 2 if (*p != '/')
121 1 break;
122 1 p++;
123
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 1 } while (strchr("bBsS", *p));
124
125
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 1 if (*p)
126 ✗ goto error;
127 } else {
128 /* parse rule as a number, expressed in the form STAY|(BORN<<9),
129 * where STAY and BORN encode the corresponding 9-bits rule */
130 ✗ long int rule = strtol(rule_str, &tail, 10);
131 ✗ if (*tail)
132 ✗ goto error;
133 ✗ *born_rule = ((1<<9)-1) & rule;
134 ✗ *stay_rule = rule >> 9;
135 }
136
137 1 return 0;
138
139 ✗ error:
140 ✗ av_log(log_ctx, AV_LOG_ERROR, "Invalid rule code '%s' provided\n", rule_str);
141 ✗ return AVERROR(EINVAL);
142 }
143
144 #ifdef DEBUG
145 static void show_life_grid(AVFilterContext *ctx)
146 {
147 LifeContext *life = ctx->priv;
148 int i, j;
149
150 char *line = av_malloc(life->w + 1);
151 if (!line)
152 return;
153 for (i = 0; i < life->h; i++) {
154 for (j = 0; j < life->w; j++)
155 line[j] = life->buf[life->buf_idx][i*life->w + j] == ALIVE_CELL ? '@' : ' ';
156 line[j] = 0;
157 av_log(ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
158 }
159 av_free(line);
160 }
161 #endif
162
163 ✗ static void fill_picture_monoblack(AVFilterContext *ctx, AVFrame *picref)
164 {
165 ✗ LifeContext *life = ctx->priv;
166 ✗ uint8_t *buf = life->buf[life->buf_idx];
167 int i, j, k;
168
169 /* fill the output picture with the old grid buffer */
170 ✗ for (i = 0; i < life->h; i++) {
171 ✗ uint8_t byte = 0;
172 ✗ uint8_t *p = picref->data[0] + i * picref->linesize[0];
173 ✗ for (k = 0, j = 0; j < life->w; j++) {
174 ✗ byte |= (buf[i*life->w+j] == ALIVE_CELL)<<(7-k++);
175 ✗ if (k==8 || j == life->w-1) {
176 ✗ k = 0;
177 ✗ *p++ = byte;
178 ✗ byte = 0;
179 }
180 }
181 }
182 ✗ }
183
184 // divide by 255 and round to nearest
185 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
186 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
187
188 14 static void fill_picture_rgb(AVFilterContext *ctx, AVFrame *picref)
189 {
190 14 LifeContext *life = ctx->priv;
191 14 uint8_t *buf = life->buf[life->buf_idx];
192 int i, j;
193
194 /* fill the output picture with the old grid buffer */
195
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 574 for (i = 0; i < life->h; i++) {
196 560 uint8_t *p = picref->data[0] + i * picref->linesize[0];
197
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 22960 for (j = 0; j < life->w; j++) {
198 22400 uint8_t v = buf[i*life->w + j];
199
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 22400 if (life->mold && v != ALIVE_CELL) {
200 20831 const uint8_t *c1 = life-> mold_color;
201 20831 const uint8_t *c2 = life->death_color;
202 20831 int death_age = FFMIN((0xff - v) * life->mold, 0xff);
203 20831 *p++ = FAST_DIV255((c2[0] << 8) + ((int)c1[0] - (int)c2[0]) * death_age);
204 20831 *p++ = FAST_DIV255((c2[1] << 8) + ((int)c1[1] - (int)c2[1]) * death_age);
205 20831 *p++ = FAST_DIV255((c2[2] << 8) + ((int)c1[2] - (int)c2[2]) * death_age);
206 } else {
207
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 1569 const uint8_t *c = v == ALIVE_CELL ? life->life_color : life->death_color;
208 1569 AV_WB24(p, c[0]<<16 | c[1]<<8 | c[2]);
209 1569 p += 3;
210 }
211 }
212 }
213 14 }
214
215 ✗ static int init_pattern_from_file(AVFilterContext *ctx)
216 {
217 ✗ LifeContext *life = ctx->priv;
218 char *p;
219 ✗ int ret, i, i0, j, h = 0, w, max_w = 0;
220
221 ✗ if ((ret = av_file_map(life->filename, &life->file_buf, &life->file_bufsize,
222 0, ctx)) < 0)
223 ✗ return ret;
224 ✗ av_freep(&life->filename);
225
226 /* prescan file to get the number of lines and the maximum width */
227 ✗ w = 0;
228 ✗ for (i = 0; i < life->file_bufsize; i++) {
229 ✗ if (life->file_buf[i] == '\n') {
230 ✗ h++; max_w = FFMAX(w, max_w); w = 0;
231 } else {
232 ✗ w++;
233 }
234 }
235 ✗ av_log(ctx, AV_LOG_DEBUG, "h:%d max_w:%d\n", h, max_w);
236
237 ✗ if (life->w) {
238 ✗ if (max_w > life->w || h > life->h) {
239 ✗ av_log(ctx, AV_LOG_ERROR,
240 "The specified size is %dx%d which cannot contain the provided file size of %dx%d\n",
241 life->w, life->h, max_w, h);
242 ✗ return AVERROR(EINVAL);
243 }
244 } else {
245 /* size was not specified, set it to size of the grid */
246 ✗ life->w = max_w;
247 ✗ life->h = h;
248 }
249
250 ✗ if (!(life->buf[0] = av_calloc(life->h * life->w, sizeof(*life->buf[0]))) ||
251 ✗ !(life->buf[1] = av_calloc(life->h * life->w, sizeof(*life->buf[1])))) {
252 ✗ av_freep(&life->buf[0]);
253 ✗ av_freep(&life->buf[1]);
254 ✗ return AVERROR(ENOMEM);
255 }
256
257 /* fill buf[0] */
258 ✗ p = life->file_buf;
259 ✗ for (i0 = 0, i = (life->h - h)/2; i0 < h; i0++, i++) {
260 ✗ for (j = (life->w - max_w)/2;; j++) {
261 ✗ av_log(ctx, AV_LOG_DEBUG, "%d:%d %c\n", i, j, *p == '\n' ? 'N' : *p);
262 ✗ if (*p == '\n') {
263 ✗ p++; break;
264 } else
265 ✗ life->buf[0][i*life->w + j] = av_isgraph(*(p++)) ? ALIVE_CELL : 0;
266 }
267 }
268 ✗ life->buf_idx = 0;
269
270 ✗ return 0;
271 }
272
273 1 static av_cold int init(AVFilterContext *ctx)
274 {
275 1 LifeContext *life = ctx->priv;
276 int ret;
277
278
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 1 if (!life->w && !life->filename)
279 ✗ av_opt_set(life, "size", "320x240", 0);
280
281
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 1 if ((ret = parse_rule(&life->born_rule, &life->stay_rule, life->rule_str, ctx)) < 0)
282 ✗ return ret;
283
284
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 1 if (!life->mold && memcmp(life->mold_color, "\x00\x00\x00", 3))
285 ✗ av_log(ctx, AV_LOG_WARNING,
286 "Mold color is set while mold isn't, ignoring the color.\n");
287
288
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 1 if (!life->filename) {
289 /* fill the grid randomly */
290 int i;
291
292
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 1 if (!(life->buf[0] = av_calloc(life->h * life->w, sizeof(*life->buf[0]))) ||
293
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 1 !(life->buf[1] = av_calloc(life->h * life->w, sizeof(*life->buf[1])))) {
294 ✗ av_freep(&life->buf[0]);
295 ✗ av_freep(&life->buf[1]);
296 ✗ return AVERROR(ENOMEM);
297 }
298
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 1 if (life->random_seed == -1)
299 ✗ life->random_seed = av_get_random_seed();
300
301 1 av_lfg_init(&life->lfg, life->random_seed);
302
303
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 1601 for (i = 0; i < life->w * life->h; i++) {
304 1600 double r = (double)av_lfg_get(&life->lfg) / UINT32_MAX;
305
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 1600 if (r <= life->random_fill_ratio)
306 171 life->buf[0][i] = ALIVE_CELL;
307 }
308 1 life->buf_idx = 0;
309 } else {
310 ✗ if ((ret = init_pattern_from_file(ctx)) < 0)
311 ✗ return ret;
312 }
313
314
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 1 if (life->mold || memcmp(life-> life_color, "\xff\xff\xff", 3)
315 ✗ || memcmp(life->death_color, "\x00\x00\x00", 3)) {
316 1 life->draw = fill_picture_rgb;
317 } else {
318 ✗ life->draw = fill_picture_monoblack;
319 }
320
321 1 av_log(ctx, AV_LOG_VERBOSE,
322 "s:%dx%d r:%d/%d rule:%s stay_rule:%d born_rule:%d stitch:%d seed:%"PRId64"\n",
323 life->w, life->h, life->frame_rate.num, life->frame_rate.den,
324 1 life->rule_str, life->stay_rule, life->born_rule, life->stitch,
325 life->random_seed);
326 1 return 0;
327 }
328
329 1 static av_cold void uninit(AVFilterContext *ctx)
330 {
331 1 LifeContext *life = ctx->priv;
332
333 1 av_file_unmap(life->file_buf, life->file_bufsize);
334 1 av_freep(&life->rule_str);
335 1 av_freep(&life->buf[0]);
336 1 av_freep(&life->buf[1]);
337 1 }
338
339 1 static int config_props(AVFilterLink *outlink)
340 {
341 1 LifeContext *life = outlink->src->priv;
342 1 FilterLink *l = ff_filter_link(outlink);
343
344 1 outlink->w = life->w;
345 1 outlink->h = life->h;
346 1 outlink->time_base = av_inv_q(life->frame_rate);
347 1 l->frame_rate = life->frame_rate;
348
349 1 return 0;
350 }
351
352 14 static void evolve(AVFilterContext *ctx)
353 {
354 14 LifeContext *life = ctx->priv;
355 int i, j;
356 14 uint8_t *oldbuf = life->buf[ life->buf_idx];
357 14 uint8_t *newbuf = life->buf[!life->buf_idx];
358
359 enum { NW, N, NE, W, E, SW, S, SE };
360
361 /* evolve the grid */
362
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 574 for (i = 0; i < life->h; i++) {
363
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 22960 for (j = 0; j < life->w; j++) {
364 int pos[8][2], n, alive, cell;
365
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 22400 if (life->stitch) {
366
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 22400 pos[NW][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NW][1] = (j-1) < 0 ? life->w-1 : j-1;
367
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 22400 pos[N ][0] = (i-1) < 0 ? life->h-1 : i-1; pos[N ][1] = j ;
368
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 22400 pos[NE][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NE][1] = (j+1) == life->w ? 0 : j+1;
369
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 22400 pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? life->w-1 : j-1;
370
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 22400 pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? 0 : j+1;
371
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 22400 pos[SW][0] = (i+1) == life->h ? 0 : i+1; pos[SW][1] = (j-1) < 0 ? life->w-1 : j-1;
372
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 22400 pos[S ][0] = (i+1) == life->h ? 0 : i+1; pos[S ][1] = j ;
373
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 22400 pos[SE][0] = (i+1) == life->h ? 0 : i+1; pos[SE][1] = (j+1) == life->w ? 0 : j+1;
374 } else {
375 ✗ pos[NW][0] = (i-1) < 0 ? -1 : i-1; pos[NW][1] = (j-1) < 0 ? -1 : j-1;
376 ✗ pos[N ][0] = (i-1) < 0 ? -1 : i-1; pos[N ][1] = j ;
377 ✗ pos[NE][0] = (i-1) < 0 ? -1 : i-1; pos[NE][1] = (j+1) == life->w ? -1 : j+1;
378 ✗ pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? -1 : j-1;
379 ✗ pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? -1 : j+1;
380 ✗ pos[SW][0] = (i+1) == life->h ? -1 : i+1; pos[SW][1] = (j-1) < 0 ? -1 : j-1;
381 ✗ pos[S ][0] = (i+1) == life->h ? -1 : i+1; pos[S ][1] = j ;
382 ✗ pos[SE][0] = (i+1) == life->h ? -1 : i+1; pos[SE][1] = (j+1) == life->w ? -1 : j+1;
383 }
384
385 /* compute the number of live neighbor cells */
386
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 22400 n = (pos[NW][0] == -1 || pos[NW][1] == -1 ? 0 : oldbuf[pos[NW][0]*life->w + pos[NW][1]] == ALIVE_CELL) +
387
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 22400 (pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]] == ALIVE_CELL) +
388
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 22400 (pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]] == ALIVE_CELL) +
389
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 22400 (pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]] == ALIVE_CELL) +
390
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 22400 (pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]] == ALIVE_CELL) +
391
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 22400 (pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]] == ALIVE_CELL) +
392
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 22400 (pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]] == ALIVE_CELL) +
393
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 22400 (pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]] == ALIVE_CELL);
394 22400 cell = oldbuf[i*life->w + j];
395
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 22400 alive = 1<<n & (cell == ALIVE_CELL ? life->stay_rule : life->born_rule);
396
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 22400 if (alive) *newbuf = ALIVE_CELL; // new cell is alive
397
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 20879 else if (cell) *newbuf = cell - 1; // new cell is dead and in the process of mold
398 17593 else *newbuf = 0; // new cell is definitely dead
399 ff_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, cell, *newbuf);
400 22400 newbuf++;
401 }
402 }
403
404 14 life->buf_idx = !life->buf_idx;
405 14 }
406
407 14 static int request_frame(AVFilterLink *outlink)
408 {
409 14 LifeContext *life = outlink->src->priv;
410 14 AVFrame *picref = ff_get_video_buffer(outlink, life->w, life->h);
411
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 14 if (!picref)
412 ✗ return AVERROR(ENOMEM);
413 14 picref->sample_aspect_ratio = (AVRational) {1, 1};
414 14 picref->pts = life->pts++;
415 14 picref->duration = 1;
416
417 14 life->draw(outlink->src, picref);
418 14 evolve(outlink->src);
419 #ifdef DEBUG
420 show_life_grid(outlink->src);
421 #endif
422 14 return ff_filter_frame(outlink, picref);
423 }
424
425 1 static int query_formats(const AVFilterContext *ctx,
426 AVFilterFormatsConfig **cfg_in,
427 AVFilterFormatsConfig **cfg_out)
428 {
429 1 const LifeContext *life = ctx->priv;
430 1 const enum AVPixelFormat pix_fmts[] = {
431
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 1 life->draw == fill_picture_rgb ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_MONOBLACK,
432 AV_PIX_FMT_NONE
433 };
434
435 1 return ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, pix_fmts);
436 }
437
438 static const AVFilterPad life_outputs[] = {
439 {
440 .name = "default",
441 .type = AVMEDIA_TYPE_VIDEO,
442 .request_frame = request_frame,
443 .config_props = config_props,
444 },
445 };
446
447 const FFFilter ff_vsrc_life = {
448 .p.name = "life",
449 .p.description = NULL_IF_CONFIG_SMALL("Create life."),
450 .p.priv_class = &life_class,
451 .p.inputs = NULL,
452 .priv_size = sizeof(LifeContext),
453 .init = init,
454 .uninit = uninit,
455 FILTER_OUTPUTS(life_outputs),
456 FILTER_QUERY_FUNC2(query_formats),
457 };
458