mirror of https://github.com/FFmpeg/FFmpeg.git
Stefano Sabatini
14 years ago
parent
6c26fe8b5a
commit
2f8b6e909d
6 changed files with 522 additions and 2 deletions
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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; |
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} |
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static void evolve(AVFilterContext *ctx) |
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{ |
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LifeContext *life = ctx->priv; |
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int i, j, v; |
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uint8_t *oldbuf = life->buf[ life->buf_idx]; |
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uint8_t *newbuf = life->buf[!life->buf_idx]; |
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enum { NW, N, NE, W, E, SW, S, SE }; |
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/* evolve the grid */ |
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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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int pos[8][2], n; |
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if (life->stitch) { |
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pos[NW][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NW][1] = (j-1) < 0 ? life->w-1 : j-1; |
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pos[N ][0] = (i-1) < 0 ? life->h-1 : i-1; pos[N ][1] = j ; |
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pos[NE][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NE][1] = (j+1) == life->w ? 0 : j+1; |
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pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? life->w-1 : j-1; |
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pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? 0 : j+1; |
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pos[SW][0] = (i+1) == life->h ? 0 : i+1; pos[SW][1] = (j-1) < 0 ? life->w-1 : j-1; |
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pos[S ][0] = (i+1) == life->h ? 0 : i+1; pos[S ][1] = j ; |
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pos[SE][0] = (i+1) == life->h ? 0 : i+1; pos[SE][1] = (j+1) == life->w ? 0 : j+1; |
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} else { |
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pos[NW][0] = (i-1) < 0 ? -1 : i-1; pos[NW][1] = (j-1) < 0 ? -1 : j-1; |
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pos[N ][0] = (i-1) < 0 ? -1 : i-1; pos[N ][1] = j ; |
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pos[NE][0] = (i-1) < 0 ? -1 : i-1; pos[NE][1] = (j+1) == life->w ? -1 : j+1; |
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pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? -1 : j-1; |
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pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? -1 : j+1; |
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pos[SW][0] = (i+1) == life->h ? -1 : i+1; pos[SW][1] = (j-1) < 0 ? -1 : j-1; |
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pos[S ][0] = (i+1) == life->h ? -1 : i+1; pos[S ][1] = j ; |
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pos[SE][0] = (i+1) == life->h ? -1 : i+1; pos[SE][1] = (j+1) == life->w ? -1 : j+1; |
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} |
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/* compute the number of live neighbor cells */ |
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n = (pos[NW][0] == -1 || pos[NW][1] == -1 ? 0 : oldbuf[pos[NW][0]*life->w + pos[NW][1]]) + |
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(pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]]) + |
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(pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]]) + |
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(pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]]) + |
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(pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]]) + |
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(pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]]) + |
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(pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]]) + |
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(pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]]); |
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v = !!(1<<n & (oldbuf[i*life->w + j] ? life->stay_rule : life->born_rule)); |
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av_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, oldbuf[i*life->w + j], v); |
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newbuf[i*life->w+j] = v; |
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} |
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} |
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life->buf_idx = !life->buf_idx; |
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} |
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static void fill_picture(AVFilterContext *ctx, AVFilterBufferRef *picref) |
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{ |
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LifeContext *life = ctx->priv; |
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uint8_t *buf = life->buf[life->buf_idx]; |
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int i, j, k; |
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/* fill the output picture with the old grid buffer */ |
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for (i = 0; i < life->h; i++) { |
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uint8_t byte = 0; |
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uint8_t *p = picref->data[0] + i * picref->linesize[0]; |
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for (k = 0, j = 0; j < life->w; j++) { |
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byte |= buf[i*life->w+j]<<(7-k++); |
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if (k==8 || j == life->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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} |
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} |
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static int request_frame(AVFilterLink *outlink) |
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{ |
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LifeContext *life = outlink->src->priv; |
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AVFilterBufferRef *picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, life->w, life->h); |
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picref->video->sample_aspect_ratio = (AVRational) {1, 1}; |
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picref->pts = life->pts++; |
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picref->pos = -1; |
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fill_picture(outlink->src, picref); |
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evolve(outlink->src); |
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#ifdef DEBUG |
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show_life_grid(outlink->src); |
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#endif |
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avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0)); |
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avfilter_draw_slice(outlink, 0, life->h, 1); |
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avfilter_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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avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
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return 0; |
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} |
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AVFilter avfilter_vsrc_life = { |
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.name = "life", |
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.description = NULL_IF_CONFIG_SMALL("Create life."), |
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.priv_size = sizeof(LifeContext), |
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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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