FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* Copyright (c) Stefano Sabatini 2011
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			* cellular automaton video source, based on Stephen Wolfram "experimentus crucis"
24			*/
25
26			/* #define DEBUG */
27
28			#include "libavutil/file.h"
29			#include "libavutil/internal.h"
30			#include "libavutil/lfg.h"
31			#include "libavutil/mem.h"
32			#include "libavutil/opt.h"
33			#include "libavutil/random_seed.h"
34			#include "libavutil/avstring.h"
35			#include "avfilter.h"
36			#include "filters.h"
37			#include "video.h"
38
39			typedef struct CellAutoContext {
40			const AVClass *class;
41			int w, h;
42			char *filename;
43			char *rule_str;
44			uint8_t *file_buf;
45			size_t file_bufsize;
46			uint8_t *buf;
47			int buf_prev_row_idx, buf_row_idx;
48			uint8_t rule;
49			uint64_t pts;
50			AVRational frame_rate;
51			double random_fill_ratio;
52			int64_t random_seed;
53			int stitch, scroll, start_full;
54			int64_t generation; ///< the generation number, starting from 0
55			AVLFG lfg;
56			char *pattern;
57			} CellAutoContext;
58
59			#define OFFSET(x) offsetof(CellAutoContext, x)
60			#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
61
62			static const AVOption cellauto_options[] = {
63			{ "filename", "read initial pattern from file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
64			{ "f", "read initial pattern from file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
65			{ "pattern", "set initial pattern", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
66			{ "p", "set initial pattern", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
67			{ "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
68			{ "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
69			{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
70			{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
71			{ "rule", "set rule", OFFSET(rule), AV_OPT_TYPE_INT, {.i64 = 110}, 0, 255, FLAGS },
72			{ "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 },
73			{ "ratio", "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl = 1/M_PHI}, 0, 1, FLAGS },
74			{ "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT32_MAX, FLAGS },
75			{ "seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT32_MAX, FLAGS },
76			{ "scroll", "scroll pattern downward", OFFSET(scroll), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
77			{ "start_full", "start filling the whole video", OFFSET(start_full), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
78			{ "full", "start filling the whole video", OFFSET(start_full), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
79			{ "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
80			{ NULL }
81			};
82
83			AVFILTER_DEFINE_CLASS(cellauto);
84
85			#ifdef DEBUG
86			static void show_cellauto_row(AVFilterContext *ctx)
87			{
88			CellAutoContext *s = ctx->priv;
89			int i;
90			uint8_t *row = s->buf + s->w * s->buf_row_idx;
91			char *line = av_malloc(s->w + 1);
92			if (!line)
93			return;
94
95			for (i = 0; i < s->w; i++)
96			line[i] = row[i] ? '@' : ' ';
97			line[i] = 0;
98			av_log(ctx, AV_LOG_DEBUG, "generation:%"PRId64" row:%s|\n", s->generation, line);
99			av_free(line);
100			}
101			#endif
102
103		✗	static int init_pattern_from_string(AVFilterContext *ctx)
104			{
105		✗	CellAutoContext *s = ctx->priv;
106			char *p;
107		✗	int i, w = 0;
108
109		✗	w = strlen(s->pattern);
110		✗	av_log(ctx, AV_LOG_DEBUG, "w:%d\n", w);
111
112		✗	if (s->w) {
113		✗	if (w > s->w) {
114		✗	av_log(ctx, AV_LOG_ERROR,
115			"The specified width is %d which cannot contain the provided string width of %d\n",
116			s->w, w);
117		✗	return AVERROR(EINVAL);
118			}
119			} else {
120			/* width was not specified, set it to width of the provided row */
121		✗	s->w = w;
122		✗	s->h = (double)s->w * M_PHI;
123			}
124
125		✗	s->buf = av_calloc(s->w, s->h * sizeof(*s->buf));
126		✗	if (!s->buf)
127		✗	return AVERROR(ENOMEM);
128
129			/* fill buf */
130		✗	p = s->pattern;
131		✗	for (i = (s->w - w)/2;; i++) {
132		✗	av_log(ctx, AV_LOG_DEBUG, "%d %c\n", i, *p == '\n' ? 'N' : *p);
133		✗	if (*p == '\n' || !*p)
134			break;
135			else
136		✗	s->buf[i] = !!av_isgraph(*(p++));
137			}
138
139		✗	return 0;
140			}
141
142		✗	static int init_pattern_from_file(AVFilterContext *ctx)
143			{
144		✗	CellAutoContext *s = ctx->priv;
145			int ret;
146
147		✗	ret = av_file_map(s->filename,
148			&s->file_buf, &s->file_bufsize, 0, ctx);
149		✗	if (ret < 0)
150		✗	return ret;
151
152			/* create a string based on the read file */
153		✗	s->pattern = av_malloc(s->file_bufsize + 1);
154		✗	if (!s->pattern)
155		✗	return AVERROR(ENOMEM);
156		✗	memcpy(s->pattern, s->file_buf, s->file_bufsize);
157		✗	s->pattern[s->file_bufsize] = 0;
158
159		✗	return init_pattern_from_string(ctx);
160			}
161
162		✗	static av_cold int init(AVFilterContext *ctx)
163			{
164		✗	CellAutoContext *s = ctx->priv;
165			int ret;
166
167		✗	if (!s->w && !s->filename && !s->pattern)
168		✗	av_opt_set(s, "size", "320x518", 0);
169
170		✗	if (s->filename && s->pattern) {
171		✗	av_log(ctx, AV_LOG_ERROR, "Only one of the filename or pattern options can be used\n");
172		✗	return AVERROR(EINVAL);
173			}
174
175		✗	if (s->filename) {
176		✗	if ((ret = init_pattern_from_file(ctx)) < 0)
177		✗	return ret;
178		✗	} else if (s->pattern) {
179		✗	if ((ret = init_pattern_from_string(ctx)) < 0)
180		✗	return ret;
181			} else {
182			/* fill the first row randomly */
183			int i;
184
185		✗	s->buf = av_calloc(s->w, s->h * sizeof(*s->buf));
186		✗	if (!s->buf)
187		✗	return AVERROR(ENOMEM);
188		✗	if (s->random_seed == -1)
189		✗	s->random_seed = av_get_random_seed();
190
191		✗	av_lfg_init(&s->lfg, s->random_seed);
192
193		✗	for (i = 0; i < s->w; i++) {
194		✗	double r = (double)av_lfg_get(&s->lfg) / UINT32_MAX;
195		✗	if (r <= s->random_fill_ratio)
196		✗	s->buf[i] = 1;
197			}
198			}
199
200		✗	av_log(ctx, AV_LOG_VERBOSE,
201			"s:%dx%d r:%d/%d rule:%d stitch:%d scroll:%d full:%d seed:%"PRId64"\n",
202			s->w, s->h, s->frame_rate.num, s->frame_rate.den,
203		✗	s->rule, s->stitch, s->scroll, s->start_full,
204			s->random_seed);
205		✗	return 0;
206			}
207
208		✗	static av_cold void uninit(AVFilterContext *ctx)
209			{
210		✗	CellAutoContext *s = ctx->priv;
211
212		✗	av_file_unmap(s->file_buf, s->file_bufsize);
213		✗	av_freep(&s->buf);
214		✗	av_freep(&s->pattern);
215		✗	}
216
217		✗	static int config_props(AVFilterLink *outlink)
218			{
219		✗	CellAutoContext *s = outlink->src->priv;
220		✗	FilterLink *l = ff_filter_link(outlink);
221
222		✗	outlink->w = s->w;
223		✗	outlink->h = s->h;
224		✗	outlink->time_base = av_inv_q(s->frame_rate);
225		✗	l->frame_rate = s->frame_rate;
226
227		✗	return 0;
228			}
229
230		✗	static void evolve(AVFilterContext *ctx)
231			{
232		✗	CellAutoContext *s = ctx->priv;
233			int i, v, pos[3];
234		✗	uint8_t *row, *prev_row = s->buf + s->buf_row_idx * s->w;
235			enum { NW, N, NE };
236
237		✗	s->buf_prev_row_idx = s->buf_row_idx;
238		✗	s->buf_row_idx = s->buf_row_idx == s->h-1 ? 0 : s->buf_row_idx+1;
239		✗	row = s->buf + s->w * s->buf_row_idx;
240
241		✗	for (i = 0; i < s->w; i++) {
242		✗	if (s->stitch) {
243		✗	pos[NW] = i-1 < 0 ? s->w-1 : i-1;
244		✗	pos[N] = i;
245		✗	pos[NE] = i+1 == s->w ? 0 : i+1;
246		✗	v = prev_row[pos[NW]]<<2 | prev_row[pos[N]]<<1 | prev_row[pos[NE]];
247			} else {
248		✗	v = 0;
249		✗	v|= i-1 >= 0 ? prev_row[i-1]<<2 : 0;
250		✗	v|= prev_row[i ]<<1 ;
251		✗	v|= i+1 < s->w ? prev_row[i+1] : 0;
252			}
253		✗	row[i] = !!(s->rule & (1<<v));
254			ff_dlog(ctx, "i:%d context:%c%c%c -> cell:%d\n", i,
255			v&4?'@':' ', v&2?'@':' ', v&1?'@':' ', row[i]);
256			}
257
258		✗	s->generation++;
259		✗	}
260
261		✗	static void fill_picture(AVFilterContext *ctx, AVFrame *picref)
262			{
263		✗	CellAutoContext *s = ctx->priv;
264		✗	int i, j, k, row_idx = 0;
265		✗	uint8_t *p0 = picref->data[0];
266
267		✗	if (s->scroll && s->generation >= s->h)
268			/* show on top the oldest row */
269		✗	row_idx = (s->buf_row_idx + 1) % s->h;
270
271			/* fill the output picture with the whole buffer */
272		✗	for (i = 0; i < s->h; i++) {
273		✗	uint8_t byte = 0;
274		✗	uint8_t *row = s->buf + row_idx*s->w;
275		✗	uint8_t *p = p0;
276		✗	for (k = 0, j = 0; j < s->w; j++) {
277		✗	byte |= row[j]<<(7-k++);
278		✗	if (k==8 || j == s->w-1) {
279		✗	k = 0;
280		✗	*p++ = byte;
281		✗	byte = 0;
282			}
283			}
284		✗	row_idx = (row_idx + 1) % s->h;
285		✗	p0 += picref->linesize[0];
286			}
287		✗	}
288
289		✗	static int request_frame(AVFilterLink *outlink)
290			{
291		✗	CellAutoContext *s = outlink->src->priv;
292		✗	AVFrame *picref = ff_get_video_buffer(outlink, s->w, s->h);
293		✗	if (!picref)
294		✗	return AVERROR(ENOMEM);
295		✗	picref->sample_aspect_ratio = (AVRational) {1, 1};
296		✗	if (s->generation == 0 && s->start_full) {
297			int i;
298		✗	for (i = 0; i < s->h-1; i++)
299		✗	evolve(outlink->src);
300			}
301		✗	fill_picture(outlink->src, picref);
302		✗	evolve(outlink->src);
303
304		✗	picref->pts = s->pts++;
305		✗	picref->duration = 1;
306
307			#ifdef DEBUG
308			show_cellauto_row(outlink->src);
309			#endif
310		✗	return ff_filter_frame(outlink, picref);
311			}
312
313			static const AVFilterPad cellauto_outputs[] = {
314			{
315			.name = "default",
316			.type = AVMEDIA_TYPE_VIDEO,
317			.request_frame = request_frame,
318			.config_props = config_props,
319			},
320			};
321
322			const AVFilter ff_vsrc_cellauto = {
323			.name = "cellauto",
324			.description = NULL_IF_CONFIG_SMALL("Create pattern generated by an elementary cellular automaton."),
325			.priv_size = sizeof(CellAutoContext),
326			.priv_class = &cellauto_class,
327			.init = init,
328			.uninit = uninit,
329			.inputs = NULL,
330			FILTER_OUTPUTS(cellauto_outputs),
331			FILTER_SINGLE_PIXFMT(AV_PIX_FMT_MONOBLACK),
332			};
333