[FFmpeg-cvslog] lavfi: add life source
Stefano Sabatini
git at videolan.org
Sun Dec 4 21:20:21 CET 2011
ffmpeg | branch: master | Stefano Sabatini <stefasab at gmail.com> | Sun Jun 26 19:47:18 2011 +0200| [2f8b6e909dd733d9b722a5266ca516a9a5ba67e9] | committer: Stefano Sabatini
lavfi: add life source
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2f8b6e909dd733d9b722a5266ca516a9a5ba67e9
---
Changelog | 1 +
doc/filters.texi | 107 ++++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/avfilter.h | 4 +-
libavfilter/vsrc_life.c | 410 ++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 522 insertions(+), 2 deletions(-)
diff --git a/Changelog b/Changelog
index 1aa814e..a2a9b0a 100644
--- a/Changelog
+++ b/Changelog
@@ -128,6 +128,7 @@ easier to use. The changes are:
- CRI ADX audio format demuxer
- Playstation Portable PMP format demuxer
- Microsoft Windows ICO demuxer
+- life source
version 0.8:
diff --git a/doc/filters.texi b/doc/filters.texi
index 6f569b0..eb1a4df 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2782,6 +2782,113 @@ Some examples follow:
frei0r_src=200x200:10:partik0l=1234 [overlay]; [in][overlay] overlay
@end example
+ at section life
+
+Generate a life pattern.
+
+This source is based on a generalization of John Conway's life game.
+
+The sourced input represents a life grid, each pixel represents a cell
+which can be in one of two possible states, alive or dead. Every cell
+interacts with its eight neighbours, which are the cells that are
+horizontally, vertically, or diagonally adjacent.
+
+At each interaction the grid evolves according to the adopted rule,
+which specifies the number of neighbor alive cells which will make a
+cell stay alive or born. The @option{rule} option allows to specify
+the rule to adopt.
+
+This source accepts a list of options in the form of
+ at var{key}=@var{value} pairs separated by ":". A description of the
+accepted options follows.
+
+ at table @option
+ at item filename, f
+Set the file from which to read the initial grid state. In the file,
+each non-whitespace character is considered an alive cell, and newline
+is used to delimit the end of each row.
+
+If this option is not specified, the initial grid is generated
+randomly.
+
+ at item rate, r
+Set the video rate, that is the number of frames generated per second.
+Default is 25.
+
+ at item random_fill_ratio, ratio
+Set the random fill ratio for the initial random grid. It is a
+floating point number value ranging from 0 to 1, defaults to 1/PHI.
+It is ignored when a file is specified.
+
+ at item random_seed, seed
+Set the seed for filling the initial random grid, must be an integer
+included between 0 and UINT32_MAX. If not specified, or if explicitly
+set to -1, the filter will try to use a good random seed on a best
+effort basis.
+
+ at item rule
+Set the life rule.
+
+A rule can be specified with a code of the kind "S at var{NS}/B at var{NB}",
+where @var{NS} and @var{NB} are sequences of numbers in the range 0-8,
+ at var{NS} specifies the number of alive neighbor cells which make a
+live cell stay alive, and @var{NB} the number of alive neighbor cells
+which make a dead cell to become alive (i.e. to "born").
+"s" and "b" can be used in place of "S" and "B", respectively.
+
+Alternatively a rule can be specified by an 18-bits integer. The 9
+high order bits are used to encode the next cell state if it is alive
+for each number of neighbor alive cells, the low order bits specify
+the rule for "borning" new cells. Higher order bits encode for an
+higher number of neighbor cells.
+For example the number 6153 = @code{(12<<9)+9} specifies a stay alive
+rule of 12 and a born rule of 9, which corresponds to "S23/B03".
+
+Default value is "S23/B3", which is the original Conway's game of life
+rule, and will keep a cell alive if it has 2 or 3 neighbor alive
+cells, and will born a new cell if there are three alive cells around
+a dead cell.
+
+ at item size, s
+Set the size of the output video.
+
+If @option{filename} is specified, the size is set by default to the
+same size of the input file. If @option{size} is set, it must contain
+the size specified in the input file, and the initial grid defined in
+that file is centered in the larger resulting area.
+
+If a filename is not specified, the size value defaults to "320x240"
+(used for a randomly generated initial grid).
+
+ at item stitch
+If set to 1, stitch the left and right grid edges together, and the
+top and bottom edges also. Defaults to 1.
+ at end table
+
+ at subsection Examples
+
+ at itemize
+ at item
+Read a grid from @file{pattern}, and center it on a grid of size
+300x300 pixels:
+ at example
+life=f=pattern:s=300x300
+ at end example
+
+ at item
+Generate a random grid of size 200x200, with a fill ratio of 2/3:
+ at example
+life=ratio=2/3:s=200x200
+ at end example
+
+ at item
+Specify a custom rule for evolving a randomly generated grid:
+ at example
+life=rule=S14/B34
+ at end example
+
+ at end itemize
+
@section nullsrc, rgbtestsrc, testsrc
The @code{nullsrc} source returns unprocessed video frames. It is
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 27979a3..7ee4d17 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -86,6 +86,7 @@ OBJS-$(CONFIG_YADIF_FILTER) += vf_yadif.o
OBJS-$(CONFIG_BUFFER_FILTER) += vsrc_buffer.o
OBJS-$(CONFIG_COLOR_FILTER) += vsrc_color.o
OBJS-$(CONFIG_FREI0R_SRC_FILTER) += vf_frei0r.o
+OBJS-$(CONFIG_LIFE_FILTER) += vsrc_life.o
OBJS-$(CONFIG_MANDELBROT_FILTER) += vsrc_mandelbrot.o
OBJS-$(CONFIG_MOVIE_FILTER) += src_movie.o
OBJS-$(CONFIG_MPTESTSRC_FILTER) += vsrc_mptestsrc.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 176cfa6..2fe92bd 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -97,6 +97,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (BUFFER, buffer, vsrc);
REGISTER_FILTER (COLOR, color, vsrc);
REGISTER_FILTER (FREI0R, frei0r_src, vsrc);
+ REGISTER_FILTER (LIFE, life, vsrc);
REGISTER_FILTER (MANDELBROT, mandelbrot, vsrc);
REGISTER_FILTER (MOVIE, movie, vsrc);
REGISTER_FILTER (MPTESTSRC, mptestsrc, vsrc);
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 373bc7b..24998a6 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -29,8 +29,8 @@
#include "libavutil/rational.h"
#define LIBAVFILTER_VERSION_MAJOR 2
-#define LIBAVFILTER_VERSION_MINOR 50
-#define LIBAVFILTER_VERSION_MICRO 1
+#define LIBAVFILTER_VERSION_MINOR 51
+#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \
diff --git a/libavfilter/vsrc_life.c b/libavfilter/vsrc_life.c
new file mode 100644
index 0000000..79e064a
--- /dev/null
+++ b/libavfilter/vsrc_life.c
@@ -0,0 +1,410 @@
+/*
+ * 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/lfg.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/random_seed.h"
+#include "avfilter.h"
+
+typedef struct {
+ const AVClass *class;
+ int w, h;
+ char *filename;
+ char *rule_str;
+ uint8_t *file_buf;
+ size_t file_bufsize;
+ char *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 time_base;
+ char *size; ///< video frame size
+ char *rate; ///< video frame rate
+ double random_fill_ratio;
+ uint32_t random_seed;
+ int stitch;
+ AVLFG lfg;
+} LifeContext;
+
+#define OFFSET(x) offsetof(LifeContext, x)
+
+static const AVOption life_options[] = {
+ { "filename", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
+ { "f", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
+ { "size", "set video size", OFFSET(size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
+ { "s", "set video size", OFFSET(size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
+ { "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },
+ { "r", "set video rate", OFFSET(rate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },
+ { "rule", "set rule", OFFSET(rule_str), AV_OPT_TYPE_STRING, {.str = "B3/S23"}, CHAR_MIN, CHAR_MAX },
+ { "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 },
+ { "ratio", "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1/M_PHI}, 0, 1 },
+ { "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX },
+ { "seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX },
+ { "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_INT, {.dbl=1}, 0, 1 },
+ { NULL },
+};
+
+static const char *life_get_name(void *ctx)
+{
+ return "life";
+}
+
+static const AVClass life_class = {
+ "LifeContext",
+ life_get_name,
+ life_options
+};
+
+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 the rule as a number, expressed in the form STAY|(BORN<<9),
+ * where STAY and DEATH 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] ? '@' : ' ';
+ 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;
+
+ /* 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->size) {
+ 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_mallocz(sizeof(char) * life->h * life->w)) ||
+ !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {
+ av_free(life->buf[0]);
+ av_free(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] = !!isgraph(*(p++));
+ }
+ }
+ life->buf_idx = 0;
+
+ return 0;
+}
+
+static int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ LifeContext *life = ctx->priv;
+ AVRational frame_rate;
+ int ret;
+
+ life->class = &life_class;
+ av_opt_set_defaults(life);
+
+ if ((ret = av_set_options_string(life, args, "=", ":")) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
+ return ret;
+ }
+
+ if ((ret = av_parse_video_rate(&frame_rate, life->rate)) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", life->rate);
+ return AVERROR(EINVAL);
+ }
+
+ if (!life->size && !life->filename)
+ av_opt_set(life, "size", "320x240", 0);
+
+ if (life->size &&
+ (ret = av_parse_video_size(&life->w, &life->h, life->size)) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", life->size);
+ return ret;
+ }
+
+ if ((ret = parse_rule(&life->born_rule, &life->stay_rule, life->rule_str, ctx)) < 0)
+ return ret;
+
+ life->time_base.num = frame_rate.den;
+ life->time_base.den = frame_rate.num;
+
+ if (!life->filename) {
+ /* fill the grid randomly */
+ int i;
+
+ if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) ||
+ !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {
+ av_free(life->buf[0]);
+ av_free(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] = 1;
+ }
+ life->buf_idx = 0;
+ } else {
+ if ((ret = init_pattern_from_file(ctx)) < 0)
+ return ret;
+ }
+
+ av_log(ctx, AV_LOG_INFO,
+ "s:%dx%d r:%d/%d rule:%s stay_rule:%d born_rule:%d stitch:%d\n",
+ life->w, life->h, frame_rate.num, frame_rate.den,
+ life->rule_str, life->stay_rule, life->born_rule, life->stitch);
+ 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 = life->time_base;
+
+ return 0;
+}
+
+static void evolve(AVFilterContext *ctx)
+{
+ LifeContext *life = ctx->priv;
+ int i, j, v;
+ 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;
+ 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]]) +
+ (pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]]) +
+ (pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]]) +
+ (pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]]) +
+ (pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]]) +
+ (pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]]) +
+ (pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]]) +
+ (pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]]);
+ v = !!(1<<n & (oldbuf[i*life->w + j] ? life->stay_rule : life->born_rule));
+ av_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, oldbuf[i*life->w + j], v);
+ newbuf[i*life->w+j] = v;
+ }
+ }
+
+ life->buf_idx = !life->buf_idx;
+}
+
+static void fill_picture(AVFilterContext *ctx, AVFilterBufferRef *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]<<(7-k++);
+ if (k==8 || j == life->w-1) {
+ k = 0;
+ *p++ = byte;
+ byte = 0;
+ }
+ }
+ }
+}
+
+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;
+
+ fill_picture(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)
+{
+ static const enum PixelFormat pix_fmts[] = { PIX_FMT_MONOBLACK, PIX_FMT_NONE };
+ 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}
+ },
+};
More information about the ffmpeg-cvslog
mailing list