| /* |
| * 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, 0, FLAGS }, |
| { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.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_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, |
| }; |
