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/* |
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* Copyright (c) Stefano Sabatini 2011 |
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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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* cellular automaton video source, based on Stephen Wolfram "experimentus crucis" |
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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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uint8_t *buf; |
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int buf_prev_row_idx, buf_row_idx; |
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uint8_t rule; |
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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, scroll, start_full; |
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int64_t generation; ///< the generation number, starting from 0 |
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AVLFG lfg; |
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char *pattern; |
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} CellAutoContext; |
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#define OFFSET(x) offsetof(CellAutoContext, x) |
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static const AVOption cellauto_options[] = { |
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{ "filename", "read initial pattern from file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 }, |
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{ "f", "read initial pattern from file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 }, |
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{ "pattern", "set initial pattern", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 }, |
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{ "p", "set initial pattern", OFFSET(pattern), 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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{ "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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{ "rule", "set rule", OFFSET(rule), AV_OPT_TYPE_INT, {.dbl = 110}, 0, 255 }, |
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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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{ "scroll", "scroll pattern downward", OFFSET(scroll), AV_OPT_TYPE_INT, {.dbl = 1}, 0, 1 }, |
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{ "start_full", "start filling the whole video", OFFSET(start_full), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1 }, |
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{ "full", "start filling the whole video", OFFSET(start_full), AV_OPT_TYPE_INT, {.dbl = 1}, 0, 1 }, |
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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 *cellauto_get_name(void *ctx) |
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{ |
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return "cellauto"; |
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} |
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static const AVClass cellauto_class = { |
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"CellAutoContext", |
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cellauto_get_name, |
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cellauto_options |
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}; |
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#ifdef DEBUG |
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static void show_cellauto_row(AVFilterContext *ctx) |
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{ |
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CellAutoContext *cellauto = ctx->priv; |
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int i; |
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uint8_t *row = cellauto->buf + cellauto->w * cellauto->buf_row_idx; |
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char *line = av_malloc(cellauto->w + 1); |
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if (!line) |
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return; |
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for (i = 0; i < cellauto->w; i++) |
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line[i] = row[i] ? '@' : ' '; |
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line[i] = 0; |
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av_log(ctx, AV_LOG_DEBUG, "generation:%"PRId64" row:%s|\n", cellauto->generation, line); |
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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_string(AVFilterContext *ctx) |
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{ |
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CellAutoContext *cellauto = ctx->priv; |
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char *p; |
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int i, w = 0; |
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w = strlen(cellauto->pattern); |
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av_log(ctx, AV_LOG_DEBUG, "w:%d\n", w); |
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if (cellauto->size) { |
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if (w > cellauto->w) { |
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av_log(ctx, AV_LOG_ERROR, |
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"The specified width is %d which cannot contain the provided string width of %d\n", |
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cellauto->w, w); |
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return AVERROR(EINVAL); |
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} |
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} else { |
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/* width was not specified, set it to width of the provided row */ |
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cellauto->w = w; |
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cellauto->h = (double)cellauto->w * M_PHI; |
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} |
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cellauto->buf = av_mallocz(sizeof(uint8_t) * cellauto->w * cellauto->h); |
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if (!cellauto->buf) |
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return AVERROR(ENOMEM); |
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/* fill buf */ |
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p = cellauto->pattern; |
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for (i = (cellauto->w - w)/2;; i++) { |
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av_log(ctx, AV_LOG_DEBUG, "%d %c\n", i, *p == '\n' ? 'N' : *p); |
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if (*p == '\n' || !*p) |
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break; |
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else |
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cellauto->buf[i] = !!isgraph(*(p++)); |
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} |
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return 0; |
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} |
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static int init_pattern_from_file(AVFilterContext *ctx) |
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{ |
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CellAutoContext *cellauto = ctx->priv; |
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int ret; |
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ret = av_file_map(cellauto->filename, |
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&cellauto->file_buf, &cellauto->file_bufsize, 0, ctx); |
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if (ret < 0) |
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return ret; |
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/* create a string based on the read file */ |
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cellauto->pattern = av_malloc(cellauto->file_bufsize + 1); |
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if (!cellauto->pattern) |
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return AVERROR(ENOMEM); |
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memcpy(cellauto->pattern, cellauto->file_buf, cellauto->file_bufsize); |
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cellauto->pattern[cellauto->file_bufsize] = 0; |
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return init_pattern_from_string(ctx); |
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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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CellAutoContext *cellauto = ctx->priv; |
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AVRational frame_rate; |
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int ret; |
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cellauto->class = &cellauto_class; |
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av_opt_set_defaults(cellauto); |
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if ((ret = av_set_options_string(cellauto, 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, cellauto->rate)) < 0) { |
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av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", cellauto->rate); |
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return AVERROR(EINVAL); |
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} |
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if (!cellauto->size && !cellauto->filename && !cellauto->pattern) |
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av_opt_set(cellauto, "size", "320x518", 0); |
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if (cellauto->size && |
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(ret = av_parse_video_size(&cellauto->w, &cellauto->h, cellauto->size)) < 0) { |
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av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", cellauto->size); |
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return ret; |
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} |
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cellauto->time_base.num = frame_rate.den; |
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cellauto->time_base.den = frame_rate.num; |
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if (cellauto->filename && cellauto->pattern) { |
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av_log(ctx, AV_LOG_ERROR, "Only one of the filename or pattern options can be used\n"); |
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return AVERROR(EINVAL); |
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} |
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if (cellauto->filename) { |
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if ((ret = init_pattern_from_file(ctx)) < 0) |
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return ret; |
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} else if (cellauto->pattern) { |
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if ((ret = init_pattern_from_string(ctx)) < 0) |
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return ret; |
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} else { |
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/* fill the first row randomly */ |
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int i; |
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cellauto->buf = av_mallocz(sizeof(uint8_t) * cellauto->w * cellauto->h); |
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if (!cellauto->buf) |
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return AVERROR(ENOMEM); |
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if (cellauto->random_seed == -1) |
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cellauto->random_seed = av_get_random_seed(); |
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av_lfg_init(&cellauto->lfg, cellauto->random_seed); |
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for (i = 0; i < cellauto->w; i++) { |
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double r = (double)av_lfg_get(&cellauto->lfg) / UINT32_MAX; |
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if (r <= cellauto->random_fill_ratio) |
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cellauto->buf[i] = 1; |
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} |
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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:%d stitch:%d scroll:%d full:%d seed:%u\n", |
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cellauto->w, cellauto->h, frame_rate.num, frame_rate.den, |
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cellauto->rule, cellauto->stitch, cellauto->scroll, cellauto->start_full, |
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cellauto->random_seed); |
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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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CellAutoContext *cellauto = ctx->priv; |
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av_file_unmap(cellauto->file_buf, cellauto->file_bufsize); |
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av_freep(&cellauto->buf); |
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av_freep(&cellauto->pattern); |
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} |
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static int config_props(AVFilterLink *outlink) |
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{ |
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CellAutoContext *cellauto = outlink->src->priv; |
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outlink->w = cellauto->w; |
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outlink->h = cellauto->h; |
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outlink->time_base = cellauto->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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CellAutoContext *cellauto = ctx->priv; |
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int i, v, pos[3]; |
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uint8_t *row, *prev_row = cellauto->buf + cellauto->buf_row_idx * cellauto->w; |
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enum { NW, N, NE }; |
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cellauto->buf_prev_row_idx = cellauto->buf_row_idx; |
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cellauto->buf_row_idx = cellauto->buf_row_idx == cellauto->h-1 ? 0 : cellauto->buf_row_idx+1; |
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row = cellauto->buf + cellauto->w * cellauto->buf_row_idx; |
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for (i = 0; i < cellauto->w; i++) { |
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if (cellauto->stitch) { |
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pos[NW] = i-1 < 0 ? cellauto->w-1 : i-1; |
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pos[N] = i; |
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pos[NE] = i+1 == cellauto->w ? 0 : i+1; |
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v = prev_row[pos[NW]]<<2 | prev_row[pos[N]]<<1 | prev_row[pos[NE]]; |
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} else { |
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v = 0; |
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v|= i-1 >= 0 ? prev_row[i-1]<<2 : 0; |
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v|= prev_row[i ]<<1 ; |
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v|= i+1 < cellauto->w ? prev_row[i+1] : 0; |
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} |
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row[i] = !!(cellauto->rule & (1<<v)); |
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av_dlog(ctx, "i:%d context:%c%c%c -> cell:%d\n", i, |
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v&4?'@':' ', v&2?'@':' ', v&1?'@':' ', row[i]); |
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} |
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cellauto->generation++; |
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} |
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static void fill_picture(AVFilterContext *ctx, AVFilterBufferRef *picref) |
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{ |
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CellAutoContext *cellauto = ctx->priv; |
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int i, j, k, row_idx = 0; |
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uint8_t *p0 = picref->data[0]; |
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if (cellauto->scroll && cellauto->generation >= cellauto->h) |
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/* show on top the oldest row */ |
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row_idx = (cellauto->buf_row_idx + 1) % cellauto->h; |
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/* fill the output picture with the whole buffer */ |
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for (i = 0; i < cellauto->h; i++) { |
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uint8_t byte = 0; |
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uint8_t *row = cellauto->buf + row_idx*cellauto->w; |
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uint8_t *p = p0; |
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for (k = 0, j = 0; j < cellauto->w; j++) { |
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byte |= row[j]<<(7-k++); |
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if (k==8 || j == cellauto->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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row_idx = (row_idx + 1) % cellauto->h; |
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p0 += picref->linesize[0]; |
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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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CellAutoContext *cellauto = outlink->src->priv; |
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AVFilterBufferRef *picref = |
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avfilter_get_video_buffer(outlink, AV_PERM_WRITE, cellauto->w, cellauto->h); |
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picref->video->sample_aspect_ratio = (AVRational) {1, 1}; |
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if (cellauto->generation == 0 && cellauto->start_full) { |
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int i; |
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for (i = 0; i < cellauto->h-1; i++) |
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evolve(outlink->src); |
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} |
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fill_picture(outlink->src, picref); |
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evolve(outlink->src); |
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picref->pts = cellauto->pts++; |
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picref->pos = -1; |
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#ifdef DEBUG |
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show_cellauto_row(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, cellauto->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_cellauto = { |
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.name = "cellauto", |
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.description = NULL_IF_CONFIG_SMALL("Create pattern generated by an elementary cellular automaton."), |
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.priv_size = sizeof(CellAutoContext), |
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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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|
}, |
|
|
|
}; |