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lavfi: add life source
This commit is contained in:
Stefano Sabatini
parent
6c26fe8b5a
commit
2f8b6e909d
@ -128,6 +128,7 @@ easier to use. The changes are:
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- CRI ADX audio format demuxer
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- Playstation Portable PMP format demuxer
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- Microsoft Windows ICO demuxer
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- life source
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version 0.8:
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107
doc/filters.texi
107
doc/filters.texi
@ -2782,6 +2782,113 @@ Some examples follow:
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frei0r_src=200x200:10:partik0l=1234 [overlay]; [in][overlay] overlay
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@end example
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@section life
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Generate a life pattern.
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This source is based on a generalization of John Conway's life game.
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The sourced input represents a life grid, each pixel represents a cell
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which can be in one of two possible states, alive or dead. Every cell
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interacts with its eight neighbours, which are the cells that are
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horizontally, vertically, or diagonally adjacent.
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At each interaction the grid evolves according to the adopted rule,
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which specifies the number of neighbor alive cells which will make a
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cell stay alive or born. The @option{rule} option allows to specify
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the rule to adopt.
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This source accepts a list of options in the form of
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@var{key}=@var{value} pairs separated by ":". A description of the
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accepted options follows.
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@table @option
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@item filename, f
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Set the file from which to read the initial grid state. In the file,
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each non-whitespace character is considered an alive cell, and newline
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is used to delimit the end of each row.
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If this option is not specified, the initial grid is generated
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randomly.
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@item rate, r
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Set the video rate, that is the number of frames generated per second.
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Default is 25.
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@item random_fill_ratio, ratio
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Set the random fill ratio for the initial random grid. It is a
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floating point number value ranging from 0 to 1, defaults to 1/PHI.
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It is ignored when a file is specified.
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@item random_seed, seed
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Set the seed for filling the initial random grid, must be an integer
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included between 0 and UINT32_MAX. If not specified, or if explicitly
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set to -1, the filter will try to use a good random seed on a best
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effort basis.
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@item rule
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Set the life rule.
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A rule can be specified with a code of the kind "S@var{NS}/B@var{NB}",
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where @var{NS} and @var{NB} are sequences of numbers in the range 0-8,
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@var{NS} specifies the number of alive neighbor cells which make a
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live cell stay alive, and @var{NB} the number of alive neighbor cells
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which make a dead cell to become alive (i.e. to "born").
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"s" and "b" can be used in place of "S" and "B", respectively.
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Alternatively a rule can be specified by an 18-bits integer. The 9
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high order bits are used to encode the next cell state if it is alive
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for each number of neighbor alive cells, the low order bits specify
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the rule for "borning" new cells. Higher order bits encode for an
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higher number of neighbor cells.
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For example the number 6153 = @code{(12<<9)+9} specifies a stay alive
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rule of 12 and a born rule of 9, which corresponds to "S23/B03".
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Default value is "S23/B3", which is the original Conway's game of life
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rule, and will keep a cell alive if it has 2 or 3 neighbor alive
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cells, and will born a new cell if there are three alive cells around
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a dead cell.
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@item size, s
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Set the size of the output video.
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If @option{filename} is specified, the size is set by default to the
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same size of the input file. If @option{size} is set, it must contain
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the size specified in the input file, and the initial grid defined in
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that file is centered in the larger resulting area.
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If a filename is not specified, the size value defaults to "320x240"
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(used for a randomly generated initial grid).
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@item stitch
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If set to 1, stitch the left and right grid edges together, and the
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top and bottom edges also. Defaults to 1.
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@end table
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@subsection Examples
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@itemize
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@item
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Read a grid from @file{pattern}, and center it on a grid of size
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300x300 pixels:
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@example
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life=f=pattern:s=300x300
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@end example
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@item
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Generate a random grid of size 200x200, with a fill ratio of 2/3:
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@example
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life=ratio=2/3:s=200x200
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@end example
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@item
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Specify a custom rule for evolving a randomly generated grid:
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@example
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life=rule=S14/B34
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@end example
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@end itemize
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@section nullsrc, rgbtestsrc, testsrc
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The @code{nullsrc} source returns unprocessed video frames. It is
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@ -86,6 +86,7 @@ OBJS-$(CONFIG_YADIF_FILTER) += vf_yadif.o
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OBJS-$(CONFIG_BUFFER_FILTER) += vsrc_buffer.o
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OBJS-$(CONFIG_COLOR_FILTER) += vsrc_color.o
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OBJS-$(CONFIG_FREI0R_SRC_FILTER) += vf_frei0r.o
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OBJS-$(CONFIG_LIFE_FILTER) += vsrc_life.o
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OBJS-$(CONFIG_MANDELBROT_FILTER) += vsrc_mandelbrot.o
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OBJS-$(CONFIG_MOVIE_FILTER) += src_movie.o
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OBJS-$(CONFIG_MPTESTSRC_FILTER) += vsrc_mptestsrc.o
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@ -97,6 +97,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (BUFFER, buffer, vsrc);
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REGISTER_FILTER (COLOR, color, vsrc);
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REGISTER_FILTER (FREI0R, frei0r_src, vsrc);
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REGISTER_FILTER (LIFE, life, vsrc);
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REGISTER_FILTER (MANDELBROT, mandelbrot, vsrc);
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REGISTER_FILTER (MOVIE, movie, vsrc);
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REGISTER_FILTER (MPTESTSRC, mptestsrc, vsrc);
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@ -29,8 +29,8 @@
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#include "libavutil/rational.h"
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#define LIBAVFILTER_VERSION_MAJOR 2
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#define LIBAVFILTER_VERSION_MINOR 50
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#define LIBAVFILTER_VERSION_MICRO 1
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#define LIBAVFILTER_VERSION_MINOR 51
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#define LIBAVFILTER_VERSION_MICRO 0
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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LIBAVFILTER_VERSION_MINOR, \
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410
libavfilter/vsrc_life.c
Normal file
410
libavfilter/vsrc_life.c
Normal file
@ -0,0 +1,410 @@
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/*
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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/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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char *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 *size; ///< video frame size
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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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AVLFG lfg;
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} LifeContext;
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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(size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "s", "set video size", OFFSET(size), 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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{ "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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{ NULL },
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};
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static const char *life_get_name(void *ctx)
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{
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return "life";
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}
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static const AVClass life_class = {
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"LifeContext",
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life_get_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 the rule as a number, expressed in the form STAY|(BORN<<9),
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* where STAY and DEATH 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] ? '@' : ' ';
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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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/* 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->size) {
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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++));
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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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if (!life->size && !life->filename)
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av_opt_set(life, "size", "320x240", 0);
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if (life->size &&
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(ret = av_parse_video_size(&life->w, &life->h, life->size)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", life->size);
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return ret;
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}
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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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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] = 1;
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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\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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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;
|
||||
}
|
||||
|
||||
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}
|
||||
},
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user