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Diffstat (limited to 'libavfilter/vsrc_life.c')
-rw-r--r-- | libavfilter/vsrc_life.c | 483 |
1 files changed, 483 insertions, 0 deletions
diff --git a/libavfilter/vsrc_life.c b/libavfilter/vsrc_life.c new file mode 100644 index 0000000..d8b8355 --- /dev/null +++ b/libavfilter/vsrc_life.c @@ -0,0 +1,483 @@ +/* + * 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/intreadwrite.h" +#include "libavutil/lfg.h" +#include "libavutil/opt.h" +#include "libavutil/parseutils.h" +#include "libavutil/random_seed.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 time_base; + char *rate; ///< video frame rate + double random_fill_ratio; + uint32_t random_seed; + int stitch; + int mold; + char *life_color_str; + char *death_color_str; + char *mold_color_str; + uint8_t life_color[4]; + uint8_t death_color[4]; + uint8_t mold_color[4]; + AVLFG lfg; + void (*draw)(AVFilterContext*, AVFilterBufferRef*); +} 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(rate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0, FLAGS }, + { "r", "set video rate", OFFSET(rate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0, 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_INT, {.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_str), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS }, + { "death_color", "set death color", OFFSET(death_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS }, + { "mold_color", "set mold color", OFFSET( mold_color_str), AV_OPT_TYPE_STRING, {.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_mallocz(sizeof(char) * life->h * life->w)) || + !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) { + av_free(life->buf[0]); + av_free(life->buf[1]); + return AVERROR(ENOMEM); + } + + /* fill buf[0] */ + p = life->file_buf; + for (i0 = 0, i = (life->h - h)/2; i0 < h; i0++, i++) { + for (j = (life->w - max_w)/2;; j++) { + av_log(ctx, AV_LOG_DEBUG, "%d:%d %c\n", i, j, *p == '\n' ? 'N' : *p); + if (*p == '\n') { + p++; break; + } else + life->buf[0][i*life->w + j] = isgraph(*(p++)) ? ALIVE_CELL : 0; + } + } + life->buf_idx = 0; + + return 0; +} + +static int init(AVFilterContext *ctx, const char *args) +{ + LifeContext *life = ctx->priv; + AVRational frame_rate; + int ret; + + life->class = &life_class; + av_opt_set_defaults(life); + + if ((ret = av_set_options_string(life, args, "=", ":")) < 0) + return ret; + + if ((ret = av_parse_video_rate(&frame_rate, life->rate)) < 0) { + av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", life->rate); + return AVERROR(EINVAL); + } + av_freep(&life->rate); + + 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; + +#define PARSE_COLOR(name) do { \ + if ((ret = av_parse_color(life->name ## _color, life->name ## _color_str, -1, ctx))) { \ + av_log(ctx, AV_LOG_ERROR, "Invalid " #name " color '%s'\n", \ + life->name ## _color_str); \ + return ret; \ + } \ + av_freep(&life->name ## _color_str); \ +} while (0) + + PARSE_COLOR(life); + PARSE_COLOR(death); + PARSE_COLOR(mold); + + 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"); + + life->time_base.num = frame_rate.den; + life->time_base.den = frame_rate.num; + + if (!life->filename) { + /* fill the grid randomly */ + int i; + + if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) || + !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) { + av_free(life->buf[0]); + av_free(life->buf[1]); + return AVERROR(ENOMEM); + } + if (life->random_seed == -1) + life->random_seed = av_get_random_seed(); + + av_lfg_init(&life->lfg, life->random_seed); + + for (i = 0; i < life->w * life->h; i++) { + double r = (double)av_lfg_get(&life->lfg) / UINT32_MAX; + if (r <= life->random_fill_ratio) + life->buf[0][i] = 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, frame_rate.num, 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 = life->time_base; + + 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 + av_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, 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] == 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, AVFilterBufferRef *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; + AVFilterBufferRef *picref = ff_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; + + life->draw(outlink->src, picref); + evolve(outlink->src); +#ifdef DEBUG + show_life_grid(outlink->src); +#endif + ff_filter_frame(outlink, picref); + + return 0; +} + +static int query_formats(AVFilterContext *ctx) +{ + LifeContext *life = ctx->priv; + enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_NONE, AV_PIX_FMT_NONE }; + 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; + } + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + return 0; +} + +static const AVFilterPad life_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .request_frame = request_frame, + .config_props = config_props, + }, + { NULL} +}; + +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 = NULL, + .outputs = life_outputs, + .priv_class = &life_class, +}; |