4d6a8a2bdb
The function is modelled after av_default_item_name(), and will print the name of the instance filter if defined, otherwise the name of the filter. This allows to show the instance name in the log, which is useful when debugging complex filter graphs.
488 lines
18 KiB
C
488 lines
18 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 "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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/**
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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 time_base;
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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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int mold;
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char *life_color_str;
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char *death_color_str;
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char *mold_color_str;
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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*, AVFilterBufferRef*);
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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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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(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0 },
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.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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{ "mold", "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.dbl=0}, 0, 0xFF },
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{ "life_color", "set life color", OFFSET( life_color_str), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },
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{ "death_color", "set death color", OFFSET(death_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
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{ "mold_color", "set mold color", OFFSET( mold_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
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{ NULL },
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};
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static const AVClass life_class = {
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"LifeContext",
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avfilter_default_filter_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 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] = 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, 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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av_freep(&life->rate);
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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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#define PARSE_COLOR(name) do { \
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if ((ret = av_parse_color(life->name ## _color, life->name ## _color_str, -1, ctx))) { \
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av_log(ctx, AV_LOG_ERROR, "Invalid " #name " color '%s'\n", \
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life->name ## _color_str); \
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return ret; \
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} \
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av_freep(&life->name ## _color_str); \
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} while (0)
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PARSE_COLOR(life);
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PARSE_COLOR(death);
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PARSE_COLOR(mold);
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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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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] = 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_INFO,
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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, 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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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 = 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;
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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, 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] == 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, 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];
|
|
int i, j;
|
|
|
|
/* fill the output picture with the old grid buffer */
|
|
for (i = 0; i < life->h; i++) {
|
|
uint8_t *p = picref->data[0] + i * picref->linesize[0];
|
|
for (j = 0; j < life->w; j++) {
|
|
uint8_t v = buf[i*life->w + j];
|
|
if (life->mold && v != ALIVE_CELL) {
|
|
const uint8_t *c1 = life-> mold_color;
|
|
const uint8_t *c2 = life->death_color;
|
|
int death_age = FFMIN((0xff - v) * life->mold, 0xff);
|
|
*p++ = FAST_DIV255((c2[0] << 8) + ((int)c1[0] - (int)c2[0]) * death_age);
|
|
*p++ = FAST_DIV255((c2[1] << 8) + ((int)c1[1] - (int)c2[1]) * death_age);
|
|
*p++ = FAST_DIV255((c2[2] << 8) + ((int)c1[2] - (int)c2[2]) * death_age);
|
|
} else {
|
|
const uint8_t *c = v == ALIVE_CELL ? life->life_color : life->death_color;
|
|
AV_WB24(p, c[0]<<16 | c[1]<<8 | c[2]);
|
|
p += 3;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int request_frame(AVFilterLink *outlink)
|
|
{
|
|
LifeContext *life = outlink->src->priv;
|
|
AVFilterBufferRef *picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, life->w, life->h);
|
|
picref->video->sample_aspect_ratio = (AVRational) {1, 1};
|
|
picref->pts = life->pts++;
|
|
picref->pos = -1;
|
|
|
|
life->draw(outlink->src, picref);
|
|
evolve(outlink->src);
|
|
#ifdef DEBUG
|
|
show_life_grid(outlink->src);
|
|
#endif
|
|
|
|
avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
|
|
avfilter_draw_slice(outlink, 0, life->h, 1);
|
|
avfilter_end_frame(outlink);
|
|
avfilter_unref_buffer(picref);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
LifeContext *life = ctx->priv;
|
|
enum PixelFormat pix_fmts[] = { PIX_FMT_NONE, 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] = PIX_FMT_RGB24;
|
|
life->draw = fill_picture_rgb;
|
|
} else {
|
|
pix_fmts[0] = PIX_FMT_MONOBLACK;
|
|
life->draw = fill_picture_monoblack;
|
|
}
|
|
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
|
|
return 0;
|
|
}
|
|
|
|
AVFilter avfilter_vsrc_life = {
|
|
.name = "life",
|
|
.description = NULL_IF_CONFIG_SMALL("Create life."),
|
|
.priv_size = sizeof(LifeContext),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
|
|
.inputs = (const AVFilterPad[]) {
|
|
{ .name = NULL}
|
|
},
|
|
.outputs = (const AVFilterPad[]) {
|
|
{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.request_frame = request_frame,
|
|
.config_props = config_props },
|
|
{ .name = NULL}
|
|
},
|
|
};
|