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-rw-r--r--libavfilter/vsrc_life.c454
1 files changed, 454 insertions, 0 deletions
diff --git a/libavfilter/vsrc_life.c b/libavfilter/vsrc_life.c
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+++ b/libavfilter/vsrc_life.c
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+/*
+ * Copyright (c) Stefano Sabatini 2010
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * life video source, based on John Conways' Life Game
+ */
+
+/* #define DEBUG */
+
+#include "libavutil/file.h"
+#include "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/lfg.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/random_seed.h"
+#include "libavutil/avstring.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "formats.h"
+#include "video.h"
+
+typedef struct {
+ const AVClass *class;
+ int w, h;
+ char *filename;
+ char *rule_str;
+ uint8_t *file_buf;
+ size_t file_bufsize;
+
+ /**
+ * The two grid state buffers.
+ *
+ * A 0xFF (ALIVE_CELL) value means the cell is alive (or new born), while
+ * the decreasing values from 0xFE to 0 means the cell is dead; the range
+ * of values is used for the slow death effect, or mold (0xFE means dead,
+ * 0xFD means very dead, 0xFC means very very dead... and 0x00 means
+ * definitely dead/mold).
+ */
+ uint8_t *buf[2];
+
+ uint8_t buf_idx;
+ uint16_t stay_rule; ///< encode the behavior for filled cells
+ uint16_t born_rule; ///< encode the behavior for empty cells
+ uint64_t pts;
+ AVRational frame_rate;
+ double random_fill_ratio;
+ uint32_t random_seed;
+ int stitch;
+ int mold;
+ uint8_t life_color[4];
+ uint8_t death_color[4];
+ uint8_t mold_color[4];
+ AVLFG lfg;
+ void (*draw)(AVFilterContext*, AVFrame*);
+} LifeContext;
+
+#define ALIVE_CELL 0xFF
+#define OFFSET(x) offsetof(LifeContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption life_options[] = {
+ { "filename", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
+ { "f", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
+ { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
+ { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
+ { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
+ { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
+ { "rule", "set rule", OFFSET(rule_str), AV_OPT_TYPE_STRING, {.str = "B3/S23"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "random_fill_ratio", "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1/M_PHI}, 0, 1, FLAGS },
+ { "ratio", "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1/M_PHI}, 0, 1, FLAGS },
+ { "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, UINT32_MAX, FLAGS },
+ { "seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, UINT32_MAX, FLAGS },
+ { "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
+ { "mold", "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.i64=0}, 0, 0xFF, FLAGS },
+ { "life_color", "set life color", OFFSET( life_color), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "death_color", "set death color", OFFSET(death_color), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "mold_color", "set mold color", OFFSET( mold_color), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(life);
+
+static int parse_rule(uint16_t *born_rule, uint16_t *stay_rule,
+ const char *rule_str, void *log_ctx)
+{
+ char *tail;
+ const char *p = rule_str;
+ *born_rule = 0;
+ *stay_rule = 0;
+
+ if (strchr("bBsS", *p)) {
+ /* parse rule as a Born / Stay Alive code, see
+ * http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life */
+ do {
+ uint16_t *rule = (*p == 'b' || *p == 'B') ? born_rule : stay_rule;
+ p++;
+ while (*p >= '0' && *p <= '8') {
+ *rule += 1<<(*p - '0');
+ p++;
+ }
+ if (*p != '/')
+ break;
+ p++;
+ } while (strchr("bBsS", *p));
+
+ if (*p)
+ goto error;
+ } else {
+ /* parse rule as a number, expressed in the form STAY|(BORN<<9),
+ * where STAY and BORN encode the corresponding 9-bits rule */
+ long int rule = strtol(rule_str, &tail, 10);
+ if (*tail)
+ goto error;
+ *born_rule = ((1<<9)-1) & rule;
+ *stay_rule = rule >> 9;
+ }
+
+ return 0;
+
+error:
+ av_log(log_ctx, AV_LOG_ERROR, "Invalid rule code '%s' provided\n", rule_str);
+ return AVERROR(EINVAL);
+}
+
+#ifdef DEBUG
+static void show_life_grid(AVFilterContext *ctx)
+{
+ LifeContext *life = ctx->priv;
+ int i, j;
+
+ char *line = av_malloc(life->w + 1);
+ if (!line)
+ return;
+ for (i = 0; i < life->h; i++) {
+ for (j = 0; j < life->w; j++)
+ line[j] = life->buf[life->buf_idx][i*life->w + j] == ALIVE_CELL ? '@' : ' ';
+ line[j] = 0;
+ av_log(ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
+ }
+ av_free(line);
+}
+#endif
+
+static int init_pattern_from_file(AVFilterContext *ctx)
+{
+ LifeContext *life = ctx->priv;
+ char *p;
+ int ret, i, i0, j, h = 0, w, max_w = 0;
+
+ if ((ret = av_file_map(life->filename, &life->file_buf, &life->file_bufsize,
+ 0, ctx)) < 0)
+ return ret;
+ av_freep(&life->filename);
+
+ /* prescan file to get the number of lines and the maximum width */
+ w = 0;
+ for (i = 0; i < life->file_bufsize; i++) {
+ if (life->file_buf[i] == '\n') {
+ h++; max_w = FFMAX(w, max_w); w = 0;
+ } else {
+ w++;
+ }
+ }
+ av_log(ctx, AV_LOG_DEBUG, "h:%d max_w:%d\n", h, max_w);
+
+ if (life->w) {
+ if (max_w > life->w || h > life->h) {
+ av_log(ctx, AV_LOG_ERROR,
+ "The specified size is %dx%d which cannot contain the provided file size of %dx%d\n",
+ life->w, life->h, max_w, h);
+ return AVERROR(EINVAL);
+ }
+ } else {
+ /* size was not specified, set it to size of the grid */
+ life->w = max_w;
+ life->h = h;
+ }
+
+ if (!(life->buf[0] = av_calloc(life->h * life->w, sizeof(*life->buf[0]))) ||
+ !(life->buf[1] = av_calloc(life->h * life->w, sizeof(*life->buf[1])))) {
+ av_freep(&life->buf[0]);
+ av_freep(&life->buf[1]);
+ return AVERROR(ENOMEM);
+ }
+
+ /* fill buf[0] */
+ p = life->file_buf;
+ for (i0 = 0, i = (life->h - h)/2; i0 < h; i0++, i++) {
+ for (j = (life->w - max_w)/2;; j++) {
+ av_log(ctx, AV_LOG_DEBUG, "%d:%d %c\n", i, j, *p == '\n' ? 'N' : *p);
+ if (*p == '\n') {
+ p++; break;
+ } else
+ life->buf[0][i*life->w + j] = av_isgraph(*(p++)) ? ALIVE_CELL : 0;
+ }
+ }
+ life->buf_idx = 0;
+
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ LifeContext *life = ctx->priv;
+ int ret;
+
+ if (!life->w && !life->filename)
+ av_opt_set(life, "size", "320x240", 0);
+
+ if ((ret = parse_rule(&life->born_rule, &life->stay_rule, life->rule_str, ctx)) < 0)
+ return ret;
+
+ if (!life->mold && memcmp(life->mold_color, "\x00\x00\x00", 3))
+ av_log(ctx, AV_LOG_WARNING,
+ "Mold color is set while mold isn't, ignoring the color.\n");
+
+ if (!life->filename) {
+ /* fill the grid randomly */
+ int i;
+
+ if (!(life->buf[0] = av_calloc(life->h * life->w, sizeof(*life->buf[0]))) ||
+ !(life->buf[1] = av_calloc(life->h * life->w, sizeof(*life->buf[1])))) {
+ av_freep(&life->buf[0]);
+ av_freep(&life->buf[1]);
+ return AVERROR(ENOMEM);
+ }
+ if (life->random_seed == -1)
+ life->random_seed = av_get_random_seed();
+
+ av_lfg_init(&life->lfg, life->random_seed);
+
+ for (i = 0; i < life->w * life->h; i++) {
+ double r = (double)av_lfg_get(&life->lfg) / UINT32_MAX;
+ if (r <= life->random_fill_ratio)
+ life->buf[0][i] = ALIVE_CELL;
+ }
+ life->buf_idx = 0;
+ } else {
+ if ((ret = init_pattern_from_file(ctx)) < 0)
+ return ret;
+ }
+
+ av_log(ctx, AV_LOG_VERBOSE,
+ "s:%dx%d r:%d/%d rule:%s stay_rule:%d born_rule:%d stitch:%d seed:%u\n",
+ life->w, life->h, life->frame_rate.num, life->frame_rate.den,
+ life->rule_str, life->stay_rule, life->born_rule, life->stitch,
+ life->random_seed);
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ LifeContext *life = ctx->priv;
+
+ av_file_unmap(life->file_buf, life->file_bufsize);
+ av_freep(&life->rule_str);
+ av_freep(&life->buf[0]);
+ av_freep(&life->buf[1]);
+}
+
+static int config_props(AVFilterLink *outlink)
+{
+ LifeContext *life = outlink->src->priv;
+
+ outlink->w = life->w;
+ outlink->h = life->h;
+ outlink->time_base = av_inv_q(life->frame_rate);
+
+ return 0;
+}
+
+static void evolve(AVFilterContext *ctx)
+{
+ LifeContext *life = ctx->priv;
+ int i, j;
+ uint8_t *oldbuf = life->buf[ life->buf_idx];
+ uint8_t *newbuf = life->buf[!life->buf_idx];
+
+ enum { NW, N, NE, W, E, SW, S, SE };
+
+ /* evolve the grid */
+ for (i = 0; i < life->h; i++) {
+ for (j = 0; j < life->w; j++) {
+ int pos[8][2], n, alive, cell;
+ if (life->stitch) {
+ pos[NW][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NW][1] = (j-1) < 0 ? life->w-1 : j-1;
+ pos[N ][0] = (i-1) < 0 ? life->h-1 : i-1; pos[N ][1] = j ;
+ pos[NE][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NE][1] = (j+1) == life->w ? 0 : j+1;
+ pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? life->w-1 : j-1;
+ pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? 0 : j+1;
+ pos[SW][0] = (i+1) == life->h ? 0 : i+1; pos[SW][1] = (j-1) < 0 ? life->w-1 : j-1;
+ pos[S ][0] = (i+1) == life->h ? 0 : i+1; pos[S ][1] = j ;
+ pos[SE][0] = (i+1) == life->h ? 0 : i+1; pos[SE][1] = (j+1) == life->w ? 0 : j+1;
+ } else {
+ pos[NW][0] = (i-1) < 0 ? -1 : i-1; pos[NW][1] = (j-1) < 0 ? -1 : j-1;
+ pos[N ][0] = (i-1) < 0 ? -1 : i-1; pos[N ][1] = j ;
+ pos[NE][0] = (i-1) < 0 ? -1 : i-1; pos[NE][1] = (j+1) == life->w ? -1 : j+1;
+ pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? -1 : j-1;
+ pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? -1 : j+1;
+ pos[SW][0] = (i+1) == life->h ? -1 : i+1; pos[SW][1] = (j-1) < 0 ? -1 : j-1;
+ pos[S ][0] = (i+1) == life->h ? -1 : i+1; pos[S ][1] = j ;
+ pos[SE][0] = (i+1) == life->h ? -1 : i+1; pos[SE][1] = (j+1) == life->w ? -1 : j+1;
+ }
+
+ /* compute the number of live neighbor cells */
+ n = (pos[NW][0] == -1 || pos[NW][1] == -1 ? 0 : oldbuf[pos[NW][0]*life->w + pos[NW][1]] == ALIVE_CELL) +
+ (pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]] == ALIVE_CELL) +
+ (pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]] == ALIVE_CELL) +
+ (pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]] == ALIVE_CELL) +
+ (pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]] == ALIVE_CELL) +
+ (pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]] == ALIVE_CELL) +
+ (pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]] == ALIVE_CELL) +
+ (pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]] == ALIVE_CELL);
+ cell = oldbuf[i*life->w + j];
+ alive = 1<<n & (cell == ALIVE_CELL ? life->stay_rule : life->born_rule);
+ if (alive) *newbuf = ALIVE_CELL; // new cell is alive
+ else if (cell) *newbuf = cell - 1; // new cell is dead and in the process of mold
+ else *newbuf = 0; // new cell is definitely dead
+ ff_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, cell, *newbuf);
+ newbuf++;
+ }
+ }
+
+ life->buf_idx = !life->buf_idx;
+}
+
+static void fill_picture_monoblack(AVFilterContext *ctx, AVFrame *picref)
+{
+ LifeContext *life = ctx->priv;
+ uint8_t *buf = life->buf[life->buf_idx];
+ int i, j, k;
+
+ /* fill the output picture with the old grid buffer */
+ for (i = 0; i < life->h; i++) {
+ uint8_t byte = 0;
+ uint8_t *p = picref->data[0] + i * picref->linesize[0];
+ for (k = 0, j = 0; j < life->w; j++) {
+ byte |= (buf[i*life->w+j] == ALIVE_CELL)<<(7-k++);
+ if (k==8 || j == life->w-1) {
+ k = 0;
+ *p++ = byte;
+ byte = 0;
+ }
+ }
+ }
+}
+
+// divide by 255 and round to nearest
+// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
+#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
+
+static void fill_picture_rgb(AVFilterContext *ctx, AVFrame *picref)
+{
+ LifeContext *life = ctx->priv;
+ uint8_t *buf = life->buf[life->buf_idx];
+ int i, j;
+
+ /* fill the output picture with the old grid buffer */
+ for (i = 0; i < life->h; i++) {
+ uint8_t *p = picref->data[0] + i * picref->linesize[0];
+ for (j = 0; j < life->w; j++) {
+ uint8_t v = buf[i*life->w + j];
+ if (life->mold && v != ALIVE_CELL) {
+ const uint8_t *c1 = life-> mold_color;
+ const uint8_t *c2 = life->death_color;
+ int death_age = FFMIN((0xff - v) * life->mold, 0xff);
+ *p++ = FAST_DIV255((c2[0] << 8) + ((int)c1[0] - (int)c2[0]) * death_age);
+ *p++ = FAST_DIV255((c2[1] << 8) + ((int)c1[1] - (int)c2[1]) * death_age);
+ *p++ = FAST_DIV255((c2[2] << 8) + ((int)c1[2] - (int)c2[2]) * death_age);
+ } else {
+ const uint8_t *c = v == ALIVE_CELL ? life->life_color : life->death_color;
+ AV_WB24(p, c[0]<<16 | c[1]<<8 | c[2]);
+ p += 3;
+ }
+ }
+ }
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ LifeContext *life = outlink->src->priv;
+ AVFrame *picref = ff_get_video_buffer(outlink, life->w, life->h);
+ if (!picref)
+ return AVERROR(ENOMEM);
+ picref->sample_aspect_ratio = (AVRational) {1, 1};
+ picref->pts = life->pts++;
+
+ life->draw(outlink->src, picref);
+ evolve(outlink->src);
+#ifdef DEBUG
+ show_life_grid(outlink->src);
+#endif
+ return ff_filter_frame(outlink, picref);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ LifeContext *life = ctx->priv;
+ enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_NONE, AV_PIX_FMT_NONE };
+ AVFilterFormats *fmts_list;
+
+ if (life->mold || memcmp(life-> life_color, "\xff\xff\xff", 3)
+ || memcmp(life->death_color, "\x00\x00\x00", 3)) {
+ pix_fmts[0] = AV_PIX_FMT_RGB24;
+ life->draw = fill_picture_rgb;
+ } else {
+ pix_fmts[0] = AV_PIX_FMT_MONOBLACK;
+ life->draw = fill_picture_monoblack;
+ }
+
+ fmts_list = ff_make_format_list(pix_fmts);
+ return ff_set_common_formats(ctx, fmts_list);
+}
+
+static const AVFilterPad life_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = request_frame,
+ .config_props = config_props,
+ },
+ { NULL}
+};
+
+AVFilter ff_vsrc_life = {
+ .name = "life",
+ .description = NULL_IF_CONFIG_SMALL("Create life."),
+ .priv_size = sizeof(LifeContext),
+ .priv_class = &life_class,
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = NULL,
+ .outputs = life_outputs,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 15:29:22 +0000