diff --git a/doc/filters.texi b/doc/filters.texi index 09ef5985d7..0980fe67c5 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -2978,6 +2978,21 @@ If a filename is not specified, the size value defaults to "320x240" @item stitch If set to 1, stitch the left and right grid edges together, and the top and bottom edges also. Defaults to 1. + +@item mold +Set cell mold speed. If set, a dead cell will go from @option{death_color} to +@option{mold_color} with a step of @option{mold}. @option{mold} can have a +value from 0 to 255. + +@item life_color +Set the color of living (or new born) cells. + +@item death_color +Set the color of dead cells. If @option{mold} is set, this is the first color +used to represent a dead cell. + +@item mold_color +Set mold color, for definitely dead and moldy cells. @end table @subsection Examples @@ -3002,6 +3017,11 @@ Specify a custom rule for evolving a randomly generated grid: life=rule=S14/B34 @end example +@item +Full example with slow death effect (mold) using @command{ffplay}: +@example +ffplay -f lavfi life=s=300x200:mold=10:r=60:ratio=0.1:death_color=#C83232:life_color=#00ff00,scale=1200:800:flags=16 +@end example @end itemize @section nullsrc, rgbtestsrc, testsrc diff --git a/libavfilter/vsrc_life.c b/libavfilter/vsrc_life.c index 2fb3878a75..ae14401787 100644 --- a/libavfilter/vsrc_life.c +++ b/libavfilter/vsrc_life.c @@ -26,6 +26,7 @@ /* #define DEBUG */ #include "libavutil/file.h" +#include "libavutil/intreadwrite.h" #include "libavutil/lfg.h" #include "libavutil/opt.h" #include "libavutil/parseutils.h" @@ -39,7 +40,18 @@ typedef struct { char *rule_str; uint8_t *file_buf; size_t file_bufsize; - char *buf[2]; + + /** + * 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 @@ -50,9 +62,18 @@ typedef struct { 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) static const AVOption life_options[] = { @@ -68,6 +89,10 @@ static const AVOption life_options[] = { { "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX }, { "seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX }, { "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_INT, {.dbl=1}, 0, 1 }, + { "mold", "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.dbl=0}, 0, 0xFF }, + { "life_color", "set life color", OFFSET( life_color_str), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX }, + { "death_color", "set death color", OFFSET(death_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX }, + { "mold_color", "set mold color", OFFSET( mold_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX }, { NULL }, }; @@ -135,7 +160,7 @@ static void show_life_grid(AVFilterContext *ctx) 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] ? '@' : ' '; + 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); } @@ -192,7 +217,7 @@ static int init_pattern_from_file(AVFilterContext *ctx) if (*p == '\n') { p++; break; } else - life->buf[0][i*life->w + j] = !!isgraph(*(p++)); + life->buf[0][i*life->w + j] = isgraph(*(p++)) ? ALIVE_CELL : 0; } } life->buf_idx = 0; @@ -231,6 +256,22 @@ static int init(AVFilterContext *ctx, const char *args, void *opaque) 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; \ + } \ +} 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; @@ -252,7 +293,7 @@ static int init(AVFilterContext *ctx, const char *args, void *opaque) 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] = 1; + life->buf[0][i] = ALIVE_CELL; } life->buf_idx = 0; } else { @@ -292,7 +333,7 @@ static int config_props(AVFilterLink *outlink) static void evolve(AVFilterContext *ctx) { LifeContext *life = ctx->priv; - int i, j, v; + int i, j; uint8_t *oldbuf = life->buf[ life->buf_idx]; uint8_t *newbuf = life->buf[!life->buf_idx]; @@ -301,7 +342,7 @@ static void evolve(AVFilterContext *ctx) /* evolve the grid */ for (i = 0; i < life->h; i++) { for (j = 0; j < life->w; j++) { - int pos[8][2], n; + 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 ; @@ -323,24 +364,28 @@ static void evolve(AVFilterContext *ctx) } /* 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]]) + - (pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]]) + - (pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]]) + - (pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]]) + - (pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]]) + - (pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]]) + - (pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]]) + - (pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]]); - v = !!(1<w + j] ? life->stay_rule : life->born_rule)); - av_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, oldbuf[i*life->w + j], v); - newbuf[i*life->w+j] = v; + 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<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(AVFilterContext *ctx, AVFilterBufferRef *picref) +static void fill_picture_monoblack(AVFilterContext *ctx, AVFilterBufferRef *picref) { LifeContext *life = ctx->priv; uint8_t *buf = life->buf[life->buf_idx]; @@ -351,7 +396,7 @@ static void fill_picture(AVFilterContext *ctx, AVFilterBufferRef *picref) 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]<<(7-k++); + byte |= (buf[i*life->w+j] == ALIVE_CELL)<<(7-k++); if (k==8 || j == life->w-1) { k = 0; *p++ = byte; @@ -361,6 +406,37 @@ static void fill_picture(AVFilterContext *ctx, AVFilterBufferRef *picref) } } +// 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; @@ -369,7 +445,7 @@ static int request_frame(AVFilterLink *outlink) picref->pts = life->pts++; picref->pos = -1; - fill_picture(outlink->src, picref); + life->draw(outlink->src, picref); evolve(outlink->src); #ifdef DEBUG show_life_grid(outlink->src); @@ -385,7 +461,16 @@ static int request_frame(AVFilterLink *outlink) static int query_formats(AVFilterContext *ctx) { - static const enum PixelFormat pix_fmts[] = { PIX_FMT_MONOBLACK, PIX_FMT_NONE }; + LifeContext *life = ctx->priv; + enum PixelFormat pix_fmts[] = { PIX_FMT_NONE, 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] = PIX_FMT_RGB24; + life->draw = fill_picture_rgb; + } else { + pix_fmts[0] = PIX_FMT_MONOBLACK; + life->draw = fill_picture_monoblack; + } avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); return 0; }