lavfi: add life source
This commit is contained in:
Stefano Sabatini
410
libavfilter/vsrc_life.c
Normal file
410
libavfilter/vsrc_life.c
Normal file
@@ -0,0 +1,410 @@
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/*
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* Copyright (c) Stefano Sabatini 2010
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* life video source, based on John Conways' Life Game
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*/
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/* #define DEBUG */
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#include "libavutil/file.h"
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#include "libavutil/lfg.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/random_seed.h"
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#include "avfilter.h"
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typedef struct {
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const AVClass *class;
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int w, h;
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char *filename;
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char *rule_str;
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uint8_t *file_buf;
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size_t file_bufsize;
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char *buf[2];
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uint8_t buf_idx;
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uint16_t stay_rule; ///< encode the behavior for filled cells
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uint16_t born_rule; ///< encode the behavior for empty cells
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uint64_t pts;
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AVRational time_base;
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char *size; ///< video frame size
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char *rate; ///< video frame rate
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double random_fill_ratio;
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uint32_t random_seed;
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int stitch;
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AVLFG lfg;
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} LifeContext;
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#define OFFSET(x) offsetof(LifeContext, x)
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static const AVOption life_options[] = {
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{ "filename", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "f", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "size", "set video size", OFFSET(size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "s", "set video size", OFFSET(size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },
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{ "r", "set video rate", OFFSET(rate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },
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{ "rule", "set rule", OFFSET(rule_str), AV_OPT_TYPE_STRING, {.str = "B3/S23"}, CHAR_MIN, CHAR_MAX },
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{ "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 },
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{ "ratio", "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1/M_PHI}, 0, 1 },
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{ "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX },
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{ "seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX },
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{ "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_INT, {.dbl=1}, 0, 1 },
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{ NULL },
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};
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static const char *life_get_name(void *ctx)
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{
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return "life";
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}
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static const AVClass life_class = {
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"LifeContext",
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life_get_name,
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life_options
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};
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static int parse_rule(uint16_t *born_rule, uint16_t *stay_rule,
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const char *rule_str, void *log_ctx)
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{
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char *tail;
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const char *p = rule_str;
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*born_rule = 0;
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*stay_rule = 0;
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if (strchr("bBsS", *p)) {
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/* parse rule as a Born / Stay Alive code, see
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* http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life */
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do {
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uint16_t *rule = (*p == 'b' || *p == 'B') ? born_rule : stay_rule;
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p++;
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while (*p >= '0' && *p <= '8') {
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*rule += 1<<(*p - '0');
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p++;
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}
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if (*p != '/')
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break;
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p++;
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} while (strchr("bBsS", *p));
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if (*p)
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goto error;
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} else {
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/* parse the rule as a number, expressed in the form STAY|(BORN<<9),
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* where STAY and DEATH encode the corresponding 9-bits rule */
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long int rule = strtol(rule_str, &tail, 10);
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if (*tail)
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goto error;
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*born_rule = ((1<<9)-1) & rule;
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*stay_rule = rule >> 9;
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}
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return 0;
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error:
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av_log(log_ctx, AV_LOG_ERROR, "Invalid rule code '%s' provided\n", rule_str);
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return AVERROR(EINVAL);
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}
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#ifdef DEBUG
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static void show_life_grid(AVFilterContext *ctx)
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{
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LifeContext *life = ctx->priv;
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int i, j;
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char *line = av_malloc(life->w + 1);
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if (!line)
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return;
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for (i = 0; i < life->h; i++) {
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for (j = 0; j < life->w; j++)
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line[j] = life->buf[life->buf_idx][i*life->w + j] ? '@' : ' ';
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line[j] = 0;
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av_log(ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
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}
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av_free(line);
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}
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#endif
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static int init_pattern_from_file(AVFilterContext *ctx)
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{
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LifeContext *life = ctx->priv;
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char *p;
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int ret, i, i0, j, h = 0, w, max_w = 0;
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if ((ret = av_file_map(life->filename, &life->file_buf, &life->file_bufsize,
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0, ctx)) < 0)
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return ret;
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/* prescan file to get the number of lines and the maximum width */
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w = 0;
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for (i = 0; i < life->file_bufsize; i++) {
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if (life->file_buf[i] == '\n') {
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h++; max_w = FFMAX(w, max_w); w = 0;
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} else {
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w++;
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}
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}
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av_log(ctx, AV_LOG_DEBUG, "h:%d max_w:%d\n", h, max_w);
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if (life->size) {
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if (max_w > life->w || h > life->h) {
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av_log(ctx, AV_LOG_ERROR,
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"The specified size is %dx%d which cannot contain the provided file size of %dx%d\n",
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life->w, life->h, max_w, h);
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return AVERROR(EINVAL);
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}
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} else {
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/* size was not specified, set it to size of the grid */
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life->w = max_w;
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life->h = h;
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}
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if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) ||
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!(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {
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av_free(life->buf[0]);
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av_free(life->buf[1]);
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return AVERROR(ENOMEM);
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}
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/* fill buf[0] */
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p = life->file_buf;
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for (i0 = 0, i = (life->h - h)/2; i0 < h; i0++, i++) {
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for (j = (life->w - max_w)/2;; j++) {
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av_log(ctx, AV_LOG_DEBUG, "%d:%d %c\n", i, j, *p == '\n' ? 'N' : *p);
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if (*p == '\n') {
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p++; break;
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} else
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life->buf[0][i*life->w + j] = !!isgraph(*(p++));
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}
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}
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life->buf_idx = 0;
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return 0;
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}
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static int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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LifeContext *life = ctx->priv;
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AVRational frame_rate;
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int ret;
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life->class = &life_class;
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av_opt_set_defaults(life);
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if ((ret = av_set_options_string(life, args, "=", ":")) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
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return ret;
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}
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if ((ret = av_parse_video_rate(&frame_rate, life->rate)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", life->rate);
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return AVERROR(EINVAL);
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}
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if (!life->size && !life->filename)
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av_opt_set(life, "size", "320x240", 0);
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if (life->size &&
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(ret = av_parse_video_size(&life->w, &life->h, life->size)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", life->size);
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return ret;
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}
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if ((ret = parse_rule(&life->born_rule, &life->stay_rule, life->rule_str, ctx)) < 0)
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return ret;
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life->time_base.num = frame_rate.den;
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life->time_base.den = frame_rate.num;
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if (!life->filename) {
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/* fill the grid randomly */
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int i;
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if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) ||
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!(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {
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av_free(life->buf[0]);
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av_free(life->buf[1]);
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return AVERROR(ENOMEM);
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}
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if (life->random_seed == -1)
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life->random_seed = av_get_random_seed();
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av_lfg_init(&life->lfg, life->random_seed);
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for (i = 0; i < life->w * life->h; i++) {
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double r = (double)av_lfg_get(&life->lfg) / UINT32_MAX;
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if (r <= life->random_fill_ratio)
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life->buf[0][i] = 1;
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}
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life->buf_idx = 0;
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} else {
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if ((ret = init_pattern_from_file(ctx)) < 0)
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return ret;
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}
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av_log(ctx, AV_LOG_INFO,
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"s:%dx%d r:%d/%d rule:%s stay_rule:%d born_rule:%d stitch:%d\n",
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life->w, life->h, frame_rate.num, frame_rate.den,
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life->rule_str, life->stay_rule, life->born_rule, life->stitch);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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LifeContext *life = ctx->priv;
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av_file_unmap(life->file_buf, life->file_bufsize);
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av_freep(&life->rule_str);
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av_freep(&life->buf[0]);
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av_freep(&life->buf[1]);
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}
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static int config_props(AVFilterLink *outlink)
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{
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LifeContext *life = outlink->src->priv;
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outlink->w = life->w;
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outlink->h = life->h;
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outlink->time_base = life->time_base;
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return 0;
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}
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static void evolve(AVFilterContext *ctx)
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{
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LifeContext *life = ctx->priv;
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int i, j, v;
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uint8_t *oldbuf = life->buf[ life->buf_idx];
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uint8_t *newbuf = life->buf[!life->buf_idx];
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enum { NW, N, NE, W, E, SW, S, SE };
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/* evolve the grid */
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for (i = 0; i < life->h; i++) {
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for (j = 0; j < life->w; j++) {
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int pos[8][2], n;
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if (life->stitch) {
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pos[NW][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NW][1] = (j-1) < 0 ? life->w-1 : j-1;
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pos[N ][0] = (i-1) < 0 ? life->h-1 : i-1; pos[N ][1] = j ;
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pos[NE][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NE][1] = (j+1) == life->w ? 0 : j+1;
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pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? life->w-1 : j-1;
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pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? 0 : j+1;
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pos[SW][0] = (i+1) == life->h ? 0 : i+1; pos[SW][1] = (j-1) < 0 ? life->w-1 : j-1;
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pos[S ][0] = (i+1) == life->h ? 0 : i+1; pos[S ][1] = j ;
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pos[SE][0] = (i+1) == life->h ? 0 : i+1; pos[SE][1] = (j+1) == life->w ? 0 : j+1;
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} else {
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pos[NW][0] = (i-1) < 0 ? -1 : i-1; pos[NW][1] = (j-1) < 0 ? -1 : j-1;
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pos[N ][0] = (i-1) < 0 ? -1 : i-1; pos[N ][1] = j ;
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pos[NE][0] = (i-1) < 0 ? -1 : i-1; pos[NE][1] = (j+1) == life->w ? -1 : j+1;
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pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? -1 : j-1;
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pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? -1 : j+1;
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pos[SW][0] = (i+1) == life->h ? -1 : i+1; pos[SW][1] = (j-1) < 0 ? -1 : j-1;
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pos[S ][0] = (i+1) == life->h ? -1 : i+1; pos[S ][1] = j ;
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pos[SE][0] = (i+1) == life->h ? -1 : i+1; pos[SE][1] = (j+1) == life->w ? -1 : j+1;
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}
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/* compute the number of live neighbor cells */
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n = (pos[NW][0] == -1 || pos[NW][1] == -1 ? 0 : oldbuf[pos[NW][0]*life->w + pos[NW][1]]) +
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(pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]]) +
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(pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]]) +
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(pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]]) +
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(pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]]) +
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(pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]]) +
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(pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]]) +
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(pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]]);
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v = !!(1<<n & (oldbuf[i*life->w + j] ? life->stay_rule : life->born_rule));
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av_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, oldbuf[i*life->w + j], v);
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newbuf[i*life->w+j] = v;
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}
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}
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life->buf_idx = !life->buf_idx;
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}
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static void fill_picture(AVFilterContext *ctx, AVFilterBufferRef *picref)
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{
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LifeContext *life = ctx->priv;
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uint8_t *buf = life->buf[life->buf_idx];
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int i, j, k;
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/* fill the output picture with the old grid buffer */
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for (i = 0; i < life->h; i++) {
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uint8_t byte = 0;
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uint8_t *p = picref->data[0] + i * picref->linesize[0];
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for (k = 0, j = 0; j < life->w; j++) {
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byte |= buf[i*life->w+j]<<(7-k++);
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if (k==8 || j == life->w-1) {
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k = 0;
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*p++ = byte;
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byte = 0;
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}
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}
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}
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}
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static int request_frame(AVFilterLink *outlink)
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{
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LifeContext *life = outlink->src->priv;
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AVFilterBufferRef *picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, life->w, life->h);
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picref->video->sample_aspect_ratio = (AVRational) {1, 1};
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picref->pts = life->pts++;
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picref->pos = -1;
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fill_picture(outlink->src, picref);
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evolve(outlink->src);
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#ifdef DEBUG
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show_life_grid(outlink->src);
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#endif
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avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
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avfilter_draw_slice(outlink, 0, life->h, 1);
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avfilter_end_frame(outlink);
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avfilter_unref_buffer(picref);
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return 0;
|
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}
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static int query_formats(AVFilterContext *ctx)
|
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{
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static const enum PixelFormat pix_fmts[] = { PIX_FMT_MONOBLACK, PIX_FMT_NONE };
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||||
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
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return 0;
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}
|
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AVFilter avfilter_vsrc_life = {
|
||||
.name = "life",
|
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.description = NULL_IF_CONFIG_SMALL("Create life."),
|
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.priv_size = sizeof(LifeContext),
|
||||
.init = init,
|
||||
.uninit = uninit,
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||||
.query_formats = query_formats,
|
||||
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||||
.inputs = (const AVFilterPad[]) {
|
||||
{ .name = NULL}
|
||||
},
|
||||
.outputs = (const AVFilterPad[]) {
|
||||
{ .name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.request_frame = request_frame,
|
||||
.config_props = config_props },
|
||||
{ .name = NULL}
|
||||
},
|
||||
};
|
||||
Reference in New Issue
Block a user