451 lines
17 KiB
C
451 lines
17 KiB
C
/*
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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/intreadwrite.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 "libavutil/avstring.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "formats.h"
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#include "video.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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/**
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* The two grid state buffers.
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*
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* A 0xFF (ALIVE_CELL) value means the cell is alive (or new born), while
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* the decreasing values from 0xFE to 0 means the cell is dead; the range
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* of values is used for the slow death effect, or mold (0xFE means dead,
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* 0xFD means very dead, 0xFC means very very dead... and 0x00 means
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* definitely dead/mold).
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*/
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uint8_t *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 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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int mold;
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uint8_t life_color[4];
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uint8_t death_color[4];
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uint8_t mold_color[4];
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AVLFG lfg;
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void (*draw)(AVFilterContext*, AVFrame*);
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} LifeContext;
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#define ALIVE_CELL 0xFF
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#define OFFSET(x) offsetof(LifeContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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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, FLAGS },
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{ "f", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
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{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
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{ "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
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{ "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
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{ "rule", "set rule", OFFSET(rule_str), AV_OPT_TYPE_STRING, {.str = "B3/S23"}, CHAR_MIN, CHAR_MAX, FLAGS },
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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, FLAGS },
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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, FLAGS },
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{ "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, UINT32_MAX, FLAGS },
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{ "seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, UINT32_MAX, FLAGS },
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{ "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
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{ "mold", "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.i64=0}, 0, 0xFF, FLAGS },
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{ "life_color", "set life color", OFFSET( life_color), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "death_color", "set death color", OFFSET(death_color), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "mold_color", "set mold color", OFFSET( mold_color), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(life);
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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 rule as a number, expressed in the form STAY|(BORN<<9),
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* where STAY and BORN 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] == ALIVE_CELL ? '@' : ' ';
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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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av_freep(&life->filename);
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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->w) {
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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] = av_isgraph(*(p++)) ? ALIVE_CELL : 0;
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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)
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{
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LifeContext *life = ctx->priv;
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int ret;
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if (!life->w && !life->filename)
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av_opt_set(life, "size", "320x240", 0);
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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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if (!life->mold && memcmp(life->mold_color, "\x00\x00\x00", 3))
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av_log(ctx, AV_LOG_WARNING,
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"Mold color is set while mold isn't, ignoring the color.\n");
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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] = ALIVE_CELL;
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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_VERBOSE,
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"s:%dx%d r:%d/%d rule:%s stay_rule:%d born_rule:%d stitch:%d seed:%u\n",
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life->w, life->h, life->frame_rate.num, life->frame_rate.den,
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life->rule_str, life->stay_rule, life->born_rule, life->stitch,
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life->random_seed);
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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 = av_inv_q(life->frame_rate);
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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;
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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, alive, cell;
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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]] == ALIVE_CELL) +
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(pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]] == ALIVE_CELL) +
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(pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]] == ALIVE_CELL) +
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(pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]] == ALIVE_CELL) +
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(pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]] == ALIVE_CELL) +
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(pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]] == ALIVE_CELL) +
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(pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]] == ALIVE_CELL) +
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(pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]] == ALIVE_CELL);
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cell = oldbuf[i*life->w + j];
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alive = 1<<n & (cell == ALIVE_CELL ? life->stay_rule : life->born_rule);
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if (alive) *newbuf = ALIVE_CELL; // new cell is alive
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else if (cell) *newbuf = cell - 1; // new cell is dead and in the process of mold
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else *newbuf = 0; // new cell is definitely dead
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av_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, cell, *newbuf);
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newbuf++;
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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_monoblack(AVFilterContext *ctx, AVFrame *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] == ALIVE_CELL)<<(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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// divide by 255 and round to nearest
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// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
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#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
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static void fill_picture_rgb(AVFilterContext *ctx, AVFrame *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;
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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 *p = picref->data[0] + i * picref->linesize[0];
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for (j = 0; j < life->w; j++) {
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uint8_t v = buf[i*life->w + j];
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if (life->mold && v != ALIVE_CELL) {
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const uint8_t *c1 = life-> mold_color;
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const uint8_t *c2 = life->death_color;
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int death_age = FFMIN((0xff - v) * life->mold, 0xff);
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*p++ = FAST_DIV255((c2[0] << 8) + ((int)c1[0] - (int)c2[0]) * death_age);
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*p++ = FAST_DIV255((c2[1] << 8) + ((int)c1[1] - (int)c2[1]) * death_age);
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*p++ = FAST_DIV255((c2[2] << 8) + ((int)c1[2] - (int)c2[2]) * death_age);
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} else {
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const uint8_t *c = v == ALIVE_CELL ? life->life_color : life->death_color;
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AV_WB24(p, c[0]<<16 | c[1]<<8 | c[2]);
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p += 3;
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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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{
|
|
LifeContext *life = outlink->src->priv;
|
|
AVFrame *picref = ff_get_video_buffer(outlink, life->w, life->h);
|
|
if (!picref)
|
|
return AVERROR(ENOMEM);
|
|
picref->sample_aspect_ratio = (AVRational) {1, 1};
|
|
picref->pts = life->pts++;
|
|
|
|
life->draw(outlink->src, picref);
|
|
evolve(outlink->src);
|
|
#ifdef DEBUG
|
|
show_life_grid(outlink->src);
|
|
#endif
|
|
return ff_filter_frame(outlink, picref);
|
|
}
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
LifeContext *life = ctx->priv;
|
|
enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_NONE, AV_PIX_FMT_NONE };
|
|
if (life->mold || memcmp(life-> life_color, "\xff\xff\xff", 3)
|
|
|| memcmp(life->death_color, "\x00\x00\x00", 3)) {
|
|
pix_fmts[0] = AV_PIX_FMT_RGB24;
|
|
life->draw = fill_picture_rgb;
|
|
} else {
|
|
pix_fmts[0] = AV_PIX_FMT_MONOBLACK;
|
|
life->draw = fill_picture_monoblack;
|
|
}
|
|
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
|
|
return 0;
|
|
}
|
|
|
|
static const AVFilterPad life_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.request_frame = request_frame,
|
|
.config_props = config_props,
|
|
},
|
|
{ NULL}
|
|
};
|
|
|
|
AVFilter avfilter_vsrc_life = {
|
|
.name = "life",
|
|
.description = NULL_IF_CONFIG_SMALL("Create life."),
|
|
.priv_size = sizeof(LifeContext),
|
|
.priv_class = &life_class,
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
.inputs = NULL,
|
|
.outputs = life_outputs,
|
|
};
|