358 lines
12 KiB
C
358 lines
12 KiB
C
/*
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* Copyright (c) Stefano Sabatini 2011
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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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* cellular automaton video source, based on Stephen Wolfram "experimentus crucis"
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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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#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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uint8_t *buf;
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int buf_prev_row_idx, buf_row_idx;
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uint8_t rule;
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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, scroll, start_full;
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int64_t generation; ///< the generation number, starting from 0
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AVLFG lfg;
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char *pattern;
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} CellAutoContext;
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#define OFFSET(x) offsetof(CellAutoContext, x)
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static const AVOption cellauto_options[] = {
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{ "filename", "read initial pattern from file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "f", "read initial pattern from file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "pattern", "set initial pattern", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "p", "set initial pattern", OFFSET(pattern), 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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{ "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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{ "rule", "set rule", OFFSET(rule), AV_OPT_TYPE_INT, {.dbl = 110}, 0, 255 },
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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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{ "scroll", "scroll pattern downward", OFFSET(scroll), AV_OPT_TYPE_INT, {.dbl = 1}, 0, 1 },
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{ "start_full", "start filling the whole video", OFFSET(start_full), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1 },
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{ "full", "start filling the whole video", OFFSET(start_full), AV_OPT_TYPE_INT, {.dbl = 1}, 0, 1 },
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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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AVFILTER_DEFINE_CLASS(cellauto);
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#ifdef DEBUG
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static void show_cellauto_row(AVFilterContext *ctx)
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{
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CellAutoContext *cellauto = ctx->priv;
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int i;
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uint8_t *row = cellauto->buf + cellauto->w * cellauto->buf_row_idx;
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char *line = av_malloc(cellauto->w + 1);
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if (!line)
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return;
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for (i = 0; i < cellauto->w; i++)
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line[i] = row[i] ? '@' : ' ';
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line[i] = 0;
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av_log(ctx, AV_LOG_DEBUG, "generation:%"PRId64" row:%s|\n", cellauto->generation, line);
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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_string(AVFilterContext *ctx)
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{
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CellAutoContext *cellauto = ctx->priv;
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char *p;
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int i, w = 0;
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w = strlen(cellauto->pattern);
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av_log(ctx, AV_LOG_DEBUG, "w:%d\n", w);
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if (cellauto->w) {
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if (w > cellauto->w) {
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av_log(ctx, AV_LOG_ERROR,
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"The specified width is %d which cannot contain the provided string width of %d\n",
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cellauto->w, w);
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return AVERROR(EINVAL);
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}
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} else {
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/* width was not specified, set it to width of the provided row */
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cellauto->w = w;
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cellauto->h = (double)cellauto->w * M_PHI;
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}
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cellauto->buf = av_mallocz(sizeof(uint8_t) * cellauto->w * cellauto->h);
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if (!cellauto->buf)
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return AVERROR(ENOMEM);
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/* fill buf */
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p = cellauto->pattern;
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for (i = (cellauto->w - w)/2;; i++) {
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av_log(ctx, AV_LOG_DEBUG, "%d %c\n", i, *p == '\n' ? 'N' : *p);
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if (*p == '\n' || !*p)
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break;
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else
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cellauto->buf[i] = !!isgraph(*(p++));
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}
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return 0;
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}
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static int init_pattern_from_file(AVFilterContext *ctx)
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{
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CellAutoContext *cellauto = ctx->priv;
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int ret;
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ret = av_file_map(cellauto->filename,
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&cellauto->file_buf, &cellauto->file_bufsize, 0, ctx);
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if (ret < 0)
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return ret;
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/* create a string based on the read file */
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cellauto->pattern = av_malloc(cellauto->file_bufsize + 1);
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if (!cellauto->pattern)
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return AVERROR(ENOMEM);
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memcpy(cellauto->pattern, cellauto->file_buf, cellauto->file_bufsize);
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cellauto->pattern[cellauto->file_bufsize] = 0;
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return init_pattern_from_string(ctx);
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}
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static int init(AVFilterContext *ctx, const char *args)
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{
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CellAutoContext *cellauto = ctx->priv;
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AVRational frame_rate;
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int ret;
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cellauto->class = &cellauto_class;
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av_opt_set_defaults(cellauto);
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if ((ret = av_set_options_string(cellauto, 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, cellauto->rate)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", cellauto->rate);
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return AVERROR(EINVAL);
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}
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if (!cellauto->w && !cellauto->filename && !cellauto->pattern)
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av_opt_set(cellauto, "size", "320x518", 0);
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cellauto->time_base.num = frame_rate.den;
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cellauto->time_base.den = frame_rate.num;
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if (cellauto->filename && cellauto->pattern) {
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av_log(ctx, AV_LOG_ERROR, "Only one of the filename or pattern options can be used\n");
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return AVERROR(EINVAL);
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}
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if (cellauto->filename) {
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if ((ret = init_pattern_from_file(ctx)) < 0)
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return ret;
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} else if (cellauto->pattern) {
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if ((ret = init_pattern_from_string(ctx)) < 0)
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return ret;
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} else {
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/* fill the first row randomly */
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int i;
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cellauto->buf = av_mallocz(sizeof(uint8_t) * cellauto->w * cellauto->h);
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if (!cellauto->buf)
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return AVERROR(ENOMEM);
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if (cellauto->random_seed == -1)
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cellauto->random_seed = av_get_random_seed();
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av_lfg_init(&cellauto->lfg, cellauto->random_seed);
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for (i = 0; i < cellauto->w; i++) {
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double r = (double)av_lfg_get(&cellauto->lfg) / UINT32_MAX;
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if (r <= cellauto->random_fill_ratio)
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cellauto->buf[i] = 1;
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}
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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:%d stitch:%d scroll:%d full:%d seed:%u\n",
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cellauto->w, cellauto->h, frame_rate.num, frame_rate.den,
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cellauto->rule, cellauto->stitch, cellauto->scroll, cellauto->start_full,
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cellauto->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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CellAutoContext *cellauto = ctx->priv;
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av_file_unmap(cellauto->file_buf, cellauto->file_bufsize);
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av_freep(&cellauto->buf);
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av_freep(&cellauto->pattern);
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}
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static int config_props(AVFilterLink *outlink)
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{
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CellAutoContext *cellauto = outlink->src->priv;
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outlink->w = cellauto->w;
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outlink->h = cellauto->h;
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outlink->time_base = cellauto->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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CellAutoContext *cellauto = ctx->priv;
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int i, v, pos[3];
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uint8_t *row, *prev_row = cellauto->buf + cellauto->buf_row_idx * cellauto->w;
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enum { NW, N, NE };
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cellauto->buf_prev_row_idx = cellauto->buf_row_idx;
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cellauto->buf_row_idx = cellauto->buf_row_idx == cellauto->h-1 ? 0 : cellauto->buf_row_idx+1;
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row = cellauto->buf + cellauto->w * cellauto->buf_row_idx;
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for (i = 0; i < cellauto->w; i++) {
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if (cellauto->stitch) {
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pos[NW] = i-1 < 0 ? cellauto->w-1 : i-1;
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pos[N] = i;
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pos[NE] = i+1 == cellauto->w ? 0 : i+1;
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v = prev_row[pos[NW]]<<2 | prev_row[pos[N]]<<1 | prev_row[pos[NE]];
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} else {
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v = 0;
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v|= i-1 >= 0 ? prev_row[i-1]<<2 : 0;
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v|= prev_row[i ]<<1 ;
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v|= i+1 < cellauto->w ? prev_row[i+1] : 0;
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}
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row[i] = !!(cellauto->rule & (1<<v));
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av_dlog(ctx, "i:%d context:%c%c%c -> cell:%d\n", i,
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v&4?'@':' ', v&2?'@':' ', v&1?'@':' ', row[i]);
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}
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cellauto->generation++;
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}
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static void fill_picture(AVFilterContext *ctx, AVFilterBufferRef *picref)
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{
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CellAutoContext *cellauto = ctx->priv;
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int i, j, k, row_idx = 0;
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uint8_t *p0 = picref->data[0];
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if (cellauto->scroll && cellauto->generation >= cellauto->h)
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/* show on top the oldest row */
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row_idx = (cellauto->buf_row_idx + 1) % cellauto->h;
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/* fill the output picture with the whole buffer */
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for (i = 0; i < cellauto->h; i++) {
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uint8_t byte = 0;
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uint8_t *row = cellauto->buf + row_idx*cellauto->w;
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uint8_t *p = p0;
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for (k = 0, j = 0; j < cellauto->w; j++) {
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byte |= row[j]<<(7-k++);
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if (k==8 || j == cellauto->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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row_idx = (row_idx + 1) % cellauto->h;
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p0 += picref->linesize[0];
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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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CellAutoContext *cellauto = outlink->src->priv;
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AVFilterBufferRef *picref =
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ff_get_video_buffer(outlink, AV_PERM_WRITE, cellauto->w, cellauto->h);
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picref->video->sample_aspect_ratio = (AVRational) {1, 1};
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if (cellauto->generation == 0 && cellauto->start_full) {
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int i;
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for (i = 0; i < cellauto->h-1; i++)
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evolve(outlink->src);
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}
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fill_picture(outlink->src, picref);
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evolve(outlink->src);
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picref->pts = cellauto->pts++;
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picref->pos = -1;
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#ifdef DEBUG
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show_cellauto_row(outlink->src);
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#endif
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ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
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ff_draw_slice(outlink, 0, cellauto->h, 1);
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ff_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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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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AVFilter avfilter_vsrc_cellauto = {
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.name = "cellauto",
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.description = NULL_IF_CONFIG_SMALL("Create pattern generated by an elementary cellular automaton."),
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.priv_size = sizeof(CellAutoContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = (const AVFilterPad[]) {
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{ .name = NULL}
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},
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.outputs = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.request_frame = request_frame,
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.config_props = config_props },
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{ .name = NULL}
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},
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};
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