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FFmpeg/libavfilter/vsrc_cellauto.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Copyright (c) Stefano Sabatini 2011
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* cellular automaton video source, based on Stephen Wolfram "experimentus crucis"
*/
/* #define DEBUG */
#include "libavutil/file.h"
#include "libavutil/internal.h"
#include "libavutil/lfg.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/random_seed.h"
#include "libavutil/avstring.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
typedef struct CellAutoContext {
const AVClass *class;
int w, h;
char *filename;
char *rule_str;
uint8_t *file_buf;
size_t file_bufsize;
uint8_t *buf;
int buf_prev_row_idx, buf_row_idx;
uint8_t rule;
uint64_t pts;
AVRational frame_rate;
double random_fill_ratio;
int64_t random_seed;
int stitch, scroll, start_full;
int64_t generation; ///< the generation number, starting from 0
AVLFG lfg;
char *pattern;
} CellAutoContext;
#define OFFSET(x) offsetof(CellAutoContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption cellauto_options[] = {
{ "filename", "read initial pattern from file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
{ "f", "read initial pattern from file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
{ "pattern", "set initial pattern", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
{ "p", "set initial pattern", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
{ "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
{ "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
{ "rule", "set rule", OFFSET(rule), AV_OPT_TYPE_INT, {.i64 = 110}, 0, 255, FLAGS },
{ "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 },
{ "ratio", "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl = 1/M_PHI}, 0, 1, FLAGS },
{ "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT32_MAX, FLAGS },
{ "seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT32_MAX, FLAGS },
{ "scroll", "scroll pattern downward", OFFSET(scroll), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
{ "start_full", "start filling the whole video", OFFSET(start_full), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
{ "full", "start filling the whole video", OFFSET(start_full), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
{ "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(cellauto);
#ifdef DEBUG
static void show_cellauto_row(AVFilterContext *ctx)
{
CellAutoContext *s = ctx->priv;
int i;
uint8_t *row = s->buf + s->w * s->buf_row_idx;
char *line = av_malloc(s->w + 1);
if (!line)
return;
for (i = 0; i < s->w; i++)
line[i] = row[i] ? '@' : ' ';
line[i] = 0;
av_log(ctx, AV_LOG_DEBUG, "generation:%"PRId64" row:%s|\n", s->generation, line);
av_free(line);
}
#endif
static int init_pattern_from_string(AVFilterContext *ctx)
{
CellAutoContext *s = ctx->priv;
char *p;
int i, w = 0;
w = strlen(s->pattern);
av_log(ctx, AV_LOG_DEBUG, "w:%d\n", w);
if (s->w) {
if (w > s->w) {
av_log(ctx, AV_LOG_ERROR,
"The specified width is %d which cannot contain the provided string width of %d\n",
s->w, w);
return AVERROR(EINVAL);
}
} else {
/* width was not specified, set it to width of the provided row */
s->w = w;
s->h = (double)s->w * M_PHI;
}
s->buf = av_calloc(s->w, s->h * sizeof(*s->buf));
if (!s->buf)
return AVERROR(ENOMEM);
/* fill buf */
p = s->pattern;
for (i = (s->w - w)/2;; i++) {
av_log(ctx, AV_LOG_DEBUG, "%d %c\n", i, *p == '\n' ? 'N' : *p);
if (*p == '\n' || !*p)
break;
else
s->buf[i] = !!av_isgraph(*(p++));
}
return 0;
}
static int init_pattern_from_file(AVFilterContext *ctx)
{
CellAutoContext *s = ctx->priv;
int ret;
ret = av_file_map(s->filename,
&s->file_buf, &s->file_bufsize, 0, ctx);
if (ret < 0)
return ret;
/* create a string based on the read file */
s->pattern = av_malloc(s->file_bufsize + 1);
if (!s->pattern)
return AVERROR(ENOMEM);
memcpy(s->pattern, s->file_buf, s->file_bufsize);
s->pattern[s->file_bufsize] = 0;
return init_pattern_from_string(ctx);
}
static av_cold int init(AVFilterContext *ctx)
{
CellAutoContext *s = ctx->priv;
int ret;
if (!s->w && !s->filename && !s->pattern)
av_opt_set(s, "size", "320x518", 0);
if (s->filename && s->pattern) {
av_log(ctx, AV_LOG_ERROR, "Only one of the filename or pattern options can be used\n");
return AVERROR(EINVAL);
}
if (s->filename) {
if ((ret = init_pattern_from_file(ctx)) < 0)
return ret;
} else if (s->pattern) {
if ((ret = init_pattern_from_string(ctx)) < 0)
return ret;
} else {
/* fill the first row randomly */
int i;
s->buf = av_calloc(s->w, s->h * sizeof(*s->buf));
if (!s->buf)
return AVERROR(ENOMEM);
if (s->random_seed == -1)
s->random_seed = av_get_random_seed();
av_lfg_init(&s->lfg, s->random_seed);
for (i = 0; i < s->w; i++) {
double r = (double)av_lfg_get(&s->lfg) / UINT32_MAX;
if (r <= s->random_fill_ratio)
s->buf[i] = 1;
}
}
av_log(ctx, AV_LOG_VERBOSE,
"s:%dx%d r:%d/%d rule:%d stitch:%d scroll:%d full:%d seed:%"PRId64"\n",
s->w, s->h, s->frame_rate.num, s->frame_rate.den,
s->rule, s->stitch, s->scroll, s->start_full,
s->random_seed);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
CellAutoContext *s = ctx->priv;
av_file_unmap(s->file_buf, s->file_bufsize);
av_freep(&s->buf);
av_freep(&s->pattern);
}
static int config_props(AVFilterLink *outlink)
{
CellAutoContext *s = outlink->src->priv;
outlink->w = s->w;
outlink->h = s->h;
outlink->time_base = av_inv_q(s->frame_rate);
outlink->frame_rate = s->frame_rate;
return 0;
}
static void evolve(AVFilterContext *ctx)
{
CellAutoContext *s = ctx->priv;
int i, v, pos[3];
uint8_t *row, *prev_row = s->buf + s->buf_row_idx * s->w;
enum { NW, N, NE };
s->buf_prev_row_idx = s->buf_row_idx;
s->buf_row_idx = s->buf_row_idx == s->h-1 ? 0 : s->buf_row_idx+1;
row = s->buf + s->w * s->buf_row_idx;
for (i = 0; i < s->w; i++) {
if (s->stitch) {
pos[NW] = i-1 < 0 ? s->w-1 : i-1;
pos[N] = i;
pos[NE] = i+1 == s->w ? 0 : i+1;
v = prev_row[pos[NW]]<<2 | prev_row[pos[N]]<<1 | prev_row[pos[NE]];
} else {
v = 0;
v|= i-1 >= 0 ? prev_row[i-1]<<2 : 0;
v|= prev_row[i ]<<1 ;
v|= i+1 < s->w ? prev_row[i+1] : 0;
}
row[i] = !!(s->rule & (1<<v));
ff_dlog(ctx, "i:%d context:%c%c%c -> cell:%d\n", i,
v&4?'@':' ', v&2?'@':' ', v&1?'@':' ', row[i]);
}
s->generation++;
}
static void fill_picture(AVFilterContext *ctx, AVFrame *picref)
{
CellAutoContext *s = ctx->priv;
int i, j, k, row_idx = 0;
uint8_t *p0 = picref->data[0];
if (s->scroll && s->generation >= s->h)
/* show on top the oldest row */
row_idx = (s->buf_row_idx + 1) % s->h;
/* fill the output picture with the whole buffer */
for (i = 0; i < s->h; i++) {
uint8_t byte = 0;
uint8_t *row = s->buf + row_idx*s->w;
uint8_t *p = p0;
for (k = 0, j = 0; j < s->w; j++) {
byte |= row[j]<<(7-k++);
if (k==8 || j == s->w-1) {
k = 0;
*p++ = byte;
byte = 0;
}
}
row_idx = (row_idx + 1) % s->h;
p0 += picref->linesize[0];
}
}
static int request_frame(AVFilterLink *outlink)
{
CellAutoContext *s = outlink->src->priv;
AVFrame *picref = ff_get_video_buffer(outlink, s->w, s->h);
if (!picref)
return AVERROR(ENOMEM);
picref->sample_aspect_ratio = (AVRational) {1, 1};
if (s->generation == 0 && s->start_full) {
int i;
for (i = 0; i < s->h-1; i++)
evolve(outlink->src);
}
fill_picture(outlink->src, picref);
evolve(outlink->src);
picref->pts = s->pts++;
picref->duration = 1;
#ifdef DEBUG
show_cellauto_row(outlink->src);
#endif
return ff_filter_frame(outlink, picref);
}
static const AVFilterPad cellauto_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.config_props = config_props,
},
};
const AVFilter ff_vsrc_cellauto = {
.name = "cellauto",
.description = NULL_IF_CONFIG_SMALL("Create pattern generated by an elementary cellular automaton."),
.priv_size = sizeof(CellAutoContext),
.priv_class = &cellauto_class,
.init = init,
.uninit = uninit,
.inputs = NULL,
FILTER_OUTPUTS(cellauto_outputs),
FILTER_SINGLE_PIXFMT(AV_PIX_FMT_MONOBLACK),
};
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