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FFmpeg/libavfilter/vsrc_life.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +02:00

452 lines
17 KiB
C

/*
* Copyright (c) Stefano Sabatini 2010
*
* 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
* life video source, based on John Conways' Life Game
*/
/* #define DEBUG */
#include "libavutil/file.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/lfg.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/random_seed.h"
#include "libavutil/avstring.h"
#include "avfilter.h"
#include "internal.h"
#include "formats.h"
#include "video.h"
typedef struct LifeContext {
const AVClass *class;
int w, h;
char *filename;
char *rule_str;
uint8_t *file_buf;
size_t file_bufsize;
/**
* The two grid state buffers.
*
* A 0xFF (ALIVE_CELL) value means the cell is alive (or new born), while
* the decreasing values from 0xFE to 0 means the cell is dead; the range
* of values is used for the slow death effect, or mold (0xFE means dead,
* 0xFD means very dead, 0xFC means very very dead... and 0x00 means
* definitely dead/mold).
*/
uint8_t *buf[2];
uint8_t buf_idx;
uint16_t stay_rule; ///< encode the behavior for filled cells
uint16_t born_rule; ///< encode the behavior for empty cells
uint64_t pts;
AVRational frame_rate;
double random_fill_ratio;
int64_t random_seed;
int stitch;
int mold;
uint8_t life_color[4];
uint8_t death_color[4];
uint8_t mold_color[4];
AVLFG lfg;
void (*draw)(AVFilterContext*, AVFrame*);
} LifeContext;
#define ALIVE_CELL 0xFF
#define OFFSET(x) offsetof(LifeContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption life_options[] = {
{ "filename", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
{ "f", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 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 },
{ "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 },
{ "rule", "set rule", OFFSET(rule_str), AV_OPT_TYPE_STRING, {.str = "B3/S23"}, 0, 0, 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 },
{ "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "mold", "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.i64=0}, 0, 0xFF, FLAGS },
{ "life_color", "set life color", OFFSET( life_color), AV_OPT_TYPE_COLOR, {.str="white"}, 0, 0, FLAGS },
{ "death_color", "set death color", OFFSET(death_color), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS },
{ "mold_color", "set mold color", OFFSET( mold_color), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(life);
static int parse_rule(uint16_t *born_rule, uint16_t *stay_rule,
const char *rule_str, void *log_ctx)
{
char *tail;
const char *p = rule_str;
*born_rule = 0;
*stay_rule = 0;
if (strchr("bBsS", *p)) {
/* parse rule as a Born / Stay Alive code, see
* http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life */
do {
uint16_t *rule = (*p == 'b' || *p == 'B') ? born_rule : stay_rule;
p++;
while (*p >= '0' && *p <= '8') {
*rule += 1<<(*p - '0');
p++;
}
if (*p != '/')
break;
p++;
} while (strchr("bBsS", *p));
if (*p)
goto error;
} else {
/* parse rule as a number, expressed in the form STAY|(BORN<<9),
* where STAY and BORN encode the corresponding 9-bits rule */
long int rule = strtol(rule_str, &tail, 10);
if (*tail)
goto error;
*born_rule = ((1<<9)-1) & rule;
*stay_rule = rule >> 9;
}
return 0;
error:
av_log(log_ctx, AV_LOG_ERROR, "Invalid rule code '%s' provided\n", rule_str);
return AVERROR(EINVAL);
}
#ifdef DEBUG
static void show_life_grid(AVFilterContext *ctx)
{
LifeContext *life = ctx->priv;
int i, j;
char *line = av_malloc(life->w + 1);
if (!line)
return;
for (i = 0; i < life->h; i++) {
for (j = 0; j < life->w; j++)
line[j] = life->buf[life->buf_idx][i*life->w + j] == ALIVE_CELL ? '@' : ' ';
line[j] = 0;
av_log(ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
}
av_free(line);
}
#endif
static int init_pattern_from_file(AVFilterContext *ctx)
{
LifeContext *life = ctx->priv;
char *p;
int ret, i, i0, j, h = 0, w, max_w = 0;
if ((ret = av_file_map(life->filename, &life->file_buf, &life->file_bufsize,
0, ctx)) < 0)
return ret;
av_freep(&life->filename);
/* prescan file to get the number of lines and the maximum width */
w = 0;
for (i = 0; i < life->file_bufsize; i++) {
if (life->file_buf[i] == '\n') {
h++; max_w = FFMAX(w, max_w); w = 0;
} else {
w++;
}
}
av_log(ctx, AV_LOG_DEBUG, "h:%d max_w:%d\n", h, max_w);
if (life->w) {
if (max_w > life->w || h > life->h) {
av_log(ctx, AV_LOG_ERROR,
"The specified size is %dx%d which cannot contain the provided file size of %dx%d\n",
life->w, life->h, max_w, h);
return AVERROR(EINVAL);
}
} else {
/* size was not specified, set it to size of the grid */
life->w = max_w;
life->h = h;
}
if (!(life->buf[0] = av_calloc(life->h * life->w, sizeof(*life->buf[0]))) ||
!(life->buf[1] = av_calloc(life->h * life->w, sizeof(*life->buf[1])))) {
av_freep(&life->buf[0]);
av_freep(&life->buf[1]);
return AVERROR(ENOMEM);
}
/* fill buf[0] */
p = life->file_buf;
for (i0 = 0, i = (life->h - h)/2; i0 < h; i0++, i++) {
for (j = (life->w - max_w)/2;; j++) {
av_log(ctx, AV_LOG_DEBUG, "%d:%d %c\n", i, j, *p == '\n' ? 'N' : *p);
if (*p == '\n') {
p++; break;
} else
life->buf[0][i*life->w + j] = av_isgraph(*(p++)) ? ALIVE_CELL : 0;
}
}
life->buf_idx = 0;
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
LifeContext *life = ctx->priv;
int ret;
if (!life->w && !life->filename)
av_opt_set(life, "size", "320x240", 0);
if ((ret = parse_rule(&life->born_rule, &life->stay_rule, life->rule_str, ctx)) < 0)
return ret;
if (!life->mold && memcmp(life->mold_color, "\x00\x00\x00", 3))
av_log(ctx, AV_LOG_WARNING,
"Mold color is set while mold isn't, ignoring the color.\n");
if (!life->filename) {
/* fill the grid randomly */
int i;
if (!(life->buf[0] = av_calloc(life->h * life->w, sizeof(*life->buf[0]))) ||
!(life->buf[1] = av_calloc(life->h * life->w, sizeof(*life->buf[1])))) {
av_freep(&life->buf[0]);
av_freep(&life->buf[1]);
return AVERROR(ENOMEM);
}
if (life->random_seed == -1)
life->random_seed = av_get_random_seed();
av_lfg_init(&life->lfg, life->random_seed);
for (i = 0; i < life->w * life->h; i++) {
double r = (double)av_lfg_get(&life->lfg) / UINT32_MAX;
if (r <= life->random_fill_ratio)
life->buf[0][i] = ALIVE_CELL;
}
life->buf_idx = 0;
} else {
if ((ret = init_pattern_from_file(ctx)) < 0)
return ret;
}
av_log(ctx, AV_LOG_VERBOSE,
"s:%dx%d r:%d/%d rule:%s stay_rule:%d born_rule:%d stitch:%d seed:%"PRId64"\n",
life->w, life->h, life->frame_rate.num, life->frame_rate.den,
life->rule_str, life->stay_rule, life->born_rule, life->stitch,
life->random_seed);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
LifeContext *life = ctx->priv;
av_file_unmap(life->file_buf, life->file_bufsize);
av_freep(&life->rule_str);
av_freep(&life->buf[0]);
av_freep(&life->buf[1]);
}
static int config_props(AVFilterLink *outlink)
{
LifeContext *life = outlink->src->priv;
outlink->w = life->w;
outlink->h = life->h;
outlink->time_base = av_inv_q(life->frame_rate);
return 0;
}
static void evolve(AVFilterContext *ctx)
{
LifeContext *life = ctx->priv;
int i, j;
uint8_t *oldbuf = life->buf[ life->buf_idx];
uint8_t *newbuf = life->buf[!life->buf_idx];
enum { NW, N, NE, W, E, SW, S, SE };
/* evolve the grid */
for (i = 0; i < life->h; i++) {
for (j = 0; j < life->w; j++) {
int pos[8][2], n, alive, cell;
if (life->stitch) {
pos[NW][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NW][1] = (j-1) < 0 ? life->w-1 : j-1;
pos[N ][0] = (i-1) < 0 ? life->h-1 : i-1; pos[N ][1] = j ;
pos[NE][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NE][1] = (j+1) == life->w ? 0 : j+1;
pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? life->w-1 : j-1;
pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? 0 : j+1;
pos[SW][0] = (i+1) == life->h ? 0 : i+1; pos[SW][1] = (j-1) < 0 ? life->w-1 : j-1;
pos[S ][0] = (i+1) == life->h ? 0 : i+1; pos[S ][1] = j ;
pos[SE][0] = (i+1) == life->h ? 0 : i+1; pos[SE][1] = (j+1) == life->w ? 0 : j+1;
} else {
pos[NW][0] = (i-1) < 0 ? -1 : i-1; pos[NW][1] = (j-1) < 0 ? -1 : j-1;
pos[N ][0] = (i-1) < 0 ? -1 : i-1; pos[N ][1] = j ;
pos[NE][0] = (i-1) < 0 ? -1 : i-1; pos[NE][1] = (j+1) == life->w ? -1 : j+1;
pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? -1 : j-1;
pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? -1 : j+1;
pos[SW][0] = (i+1) == life->h ? -1 : i+1; pos[SW][1] = (j-1) < 0 ? -1 : j-1;
pos[S ][0] = (i+1) == life->h ? -1 : i+1; pos[S ][1] = j ;
pos[SE][0] = (i+1) == life->h ? -1 : i+1; pos[SE][1] = (j+1) == life->w ? -1 : j+1;
}
/* compute the number of live neighbor cells */
n = (pos[NW][0] == -1 || pos[NW][1] == -1 ? 0 : oldbuf[pos[NW][0]*life->w + pos[NW][1]] == ALIVE_CELL) +
(pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]] == ALIVE_CELL) +
(pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]] == ALIVE_CELL) +
(pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]] == ALIVE_CELL) +
(pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]] == ALIVE_CELL) +
(pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]] == ALIVE_CELL) +
(pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]] == ALIVE_CELL) +
(pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]] == ALIVE_CELL);
cell = oldbuf[i*life->w + j];
alive = 1<<n & (cell == ALIVE_CELL ? life->stay_rule : life->born_rule);
if (alive) *newbuf = ALIVE_CELL; // new cell is alive
else if (cell) *newbuf = cell - 1; // new cell is dead and in the process of mold
else *newbuf = 0; // new cell is definitely dead
ff_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, cell, *newbuf);
newbuf++;
}
}
life->buf_idx = !life->buf_idx;
}
static void fill_picture_monoblack(AVFilterContext *ctx, AVFrame *picref)
{
LifeContext *life = ctx->priv;
uint8_t *buf = life->buf[life->buf_idx];
int i, j, k;
/* fill the output picture with the old grid buffer */
for (i = 0; i < life->h; i++) {
uint8_t byte = 0;
uint8_t *p = picref->data[0] + i * picref->linesize[0];
for (k = 0, j = 0; j < life->w; j++) {
byte |= (buf[i*life->w+j] == ALIVE_CELL)<<(7-k++);
if (k==8 || j == life->w-1) {
k = 0;
*p++ = byte;
byte = 0;
}
}
}
}
// divide by 255 and round to nearest
// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
static void fill_picture_rgb(AVFilterContext *ctx, AVFrame *picref)
{
LifeContext *life = ctx->priv;
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;
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;
}
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static const AVFilterPad life_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.config_props = config_props,
},
};
const AVFilter ff_vsrc_life = {
.name = "life",
.description = NULL_IF_CONFIG_SMALL("Create life."),
.priv_size = sizeof(LifeContext),
.priv_class = &life_class,
.init = init,
.uninit = uninit,
.inputs = NULL,
FILTER_OUTPUTS(life_outputs),
FILTER_QUERY_FUNC(query_formats),
};