yading@11: /*
yading@11:  * Copyright (c) Stefano Sabatini 2010
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * life video source, based on John Conways' Life Game
yading@11:  */
yading@11: 
yading@11: /* #define DEBUG */
yading@11: 
yading@11: #include "libavutil/file.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/lfg.h"
yading@11: #include "libavutil/opt.h"
yading@11: #include "libavutil/parseutils.h"
yading@11: #include "libavutil/random_seed.h"
yading@11: #include "libavutil/avstring.h"
yading@11: #include "avfilter.h"
yading@11: #include "internal.h"
yading@11: #include "formats.h"
yading@11: #include "video.h"
yading@11: 
yading@11: typedef struct {
yading@11:     const AVClass *class;
yading@11:     int w, h;
yading@11:     char *filename;
yading@11:     char *rule_str;
yading@11:     uint8_t *file_buf;
yading@11:     size_t file_bufsize;
yading@11: 
yading@11:     /**
yading@11:      * The two grid state buffers.
yading@11:      *
yading@11:      * A 0xFF (ALIVE_CELL) value means the cell is alive (or new born), while
yading@11:      * the decreasing values from 0xFE to 0 means the cell is dead; the range
yading@11:      * of values is used for the slow death effect, or mold (0xFE means dead,
yading@11:      * 0xFD means very dead, 0xFC means very very dead... and 0x00 means
yading@11:      * definitely dead/mold).
yading@11:      */
yading@11:     uint8_t *buf[2];
yading@11: 
yading@11:     uint8_t  buf_idx;
yading@11:     uint16_t stay_rule;         ///< encode the behavior for filled cells
yading@11:     uint16_t born_rule;         ///< encode the behavior for empty cells
yading@11:     uint64_t pts;
yading@11:     AVRational frame_rate;
yading@11:     double   random_fill_ratio;
yading@11:     uint32_t random_seed;
yading@11:     int stitch;
yading@11:     int mold;
yading@11:     char  *life_color_str;
yading@11:     char *death_color_str;
yading@11:     char  *mold_color_str;
yading@11:     uint8_t  life_color[4];
yading@11:     uint8_t death_color[4];
yading@11:     uint8_t  mold_color[4];
yading@11:     AVLFG lfg;
yading@11:     void (*draw)(AVFilterContext*, AVFrame*);
yading@11: } LifeContext;
yading@11: 
yading@11: #define ALIVE_CELL 0xFF
yading@11: #define OFFSET(x) offsetof(LifeContext, x)
yading@11: #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
yading@11: 
yading@11: static const AVOption life_options[] = {
yading@11:     { "filename", "set source file",  OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
yading@11:     { "f",        "set source file",  OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
yading@11:     { "size",     "set video size",   OFFSET(w),        AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
yading@11:     { "s",        "set video size",   OFFSET(w),        AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },
yading@11:     { "rate",     "set video rate",   OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
yading@11:     { "r",        "set video rate",   OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
yading@11:     { "rule",     "set rule",         OFFSET(rule_str), AV_OPT_TYPE_STRING, {.str = "B3/S23"}, CHAR_MIN, CHAR_MAX, FLAGS },
yading@11:     { "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 },
yading@11:     { "ratio",             "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1/M_PHI}, 0, 1, FLAGS },
yading@11:     { "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, UINT32_MAX, FLAGS },
yading@11:     { "seed",        "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, UINT32_MAX, FLAGS },
yading@11:     { "stitch",      "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
yading@11:     { "mold",        "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.i64=0}, 0, 0xFF, FLAGS },
yading@11:     { "life_color",  "set life color",  OFFSET( life_color_str), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS },
yading@11:     { "death_color", "set death color", OFFSET(death_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
yading@11:     { "mold_color",  "set mold color",  OFFSET( mold_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
yading@11:     { NULL },
yading@11: };
yading@11: 
yading@11: AVFILTER_DEFINE_CLASS(life);
yading@11: 
yading@11: static int parse_rule(uint16_t *born_rule, uint16_t *stay_rule,
yading@11:                       const char *rule_str, void *log_ctx)
yading@11: {
yading@11:     char *tail;
yading@11:     const char *p = rule_str;
yading@11:     *born_rule = 0;
yading@11:     *stay_rule = 0;
yading@11: 
yading@11:     if (strchr("bBsS", *p)) {
yading@11:         /* parse rule as a Born / Stay Alive code, see
yading@11:          * http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life */
yading@11:         do {
yading@11:             uint16_t *rule = (*p == 'b' || *p == 'B') ? born_rule : stay_rule;
yading@11:             p++;
yading@11:             while (*p >= '0' && *p <= '8') {
yading@11:                 *rule += 1<<(*p - '0');
yading@11:                 p++;
yading@11:             }
yading@11:             if (*p != '/')
yading@11:                 break;
yading@11:             p++;
yading@11:         } while (strchr("bBsS", *p));
yading@11: 
yading@11:         if (*p)
yading@11:             goto error;
yading@11:     } else {
yading@11:         /* parse rule as a number, expressed in the form STAY|(BORN<<9),
yading@11:          * where STAY and BORN encode the corresponding 9-bits rule */
yading@11:         long int rule = strtol(rule_str, &tail, 10);
yading@11:         if (*tail)
yading@11:             goto error;
yading@11:         *born_rule  = ((1<<9)-1) & rule;
yading@11:         *stay_rule = rule >> 9;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: 
yading@11: error:
yading@11:     av_log(log_ctx, AV_LOG_ERROR, "Invalid rule code '%s' provided\n", rule_str);
yading@11:     return AVERROR(EINVAL);
yading@11: }
yading@11: 
yading@11: #ifdef DEBUG
yading@11: static void show_life_grid(AVFilterContext *ctx)
yading@11: {
yading@11:     LifeContext *life = ctx->priv;
yading@11:     int i, j;
yading@11: 
yading@11:     char *line = av_malloc(life->w + 1);
yading@11:     if (!line)
yading@11:         return;
yading@11:     for (i = 0; i < life->h; i++) {
yading@11:         for (j = 0; j < life->w; j++)
yading@11:             line[j] = life->buf[life->buf_idx][i*life->w + j] == ALIVE_CELL ? '@' : ' ';
yading@11:         line[j] = 0;
yading@11:         av_log(ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
yading@11:     }
yading@11:     av_free(line);
yading@11: }
yading@11: #endif
yading@11: 
yading@11: static int init_pattern_from_file(AVFilterContext *ctx)
yading@11: {
yading@11:     LifeContext *life = ctx->priv;
yading@11:     char *p;
yading@11:     int ret, i, i0, j, h = 0, w, max_w = 0;
yading@11: 
yading@11:     if ((ret = av_file_map(life->filename, &life->file_buf, &life->file_bufsize,
yading@11:                            0, ctx)) < 0)
yading@11:         return ret;
yading@11:     av_freep(&life->filename);
yading@11: 
yading@11:     /* prescan file to get the number of lines and the maximum width */
yading@11:     w = 0;
yading@11:     for (i = 0; i < life->file_bufsize; i++) {
yading@11:         if (life->file_buf[i] == '\n') {
yading@11:             h++; max_w = FFMAX(w, max_w); w = 0;
yading@11:         } else {
yading@11:             w++;
yading@11:         }
yading@11:     }
yading@11:     av_log(ctx, AV_LOG_DEBUG, "h:%d max_w:%d\n", h, max_w);
yading@11: 
yading@11:     if (life->w) {
yading@11:         if (max_w > life->w || h > life->h) {
yading@11:             av_log(ctx, AV_LOG_ERROR,
yading@11:                    "The specified size is %dx%d which cannot contain the provided file size of %dx%d\n",
yading@11:                    life->w, life->h, max_w, h);
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11:     } else {
yading@11:         /* size was not specified, set it to size of the grid */
yading@11:         life->w = max_w;
yading@11:         life->h = h;
yading@11:     }
yading@11: 
yading@11:     if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) ||
yading@11:         !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {
yading@11:         av_free(life->buf[0]);
yading@11:         av_free(life->buf[1]);
yading@11:         return AVERROR(ENOMEM);
yading@11:     }
yading@11: 
yading@11:     /* fill buf[0] */
yading@11:     p = life->file_buf;
yading@11:     for (i0 = 0, i = (life->h - h)/2; i0 < h; i0++, i++) {
yading@11:         for (j = (life->w - max_w)/2;; j++) {
yading@11:             av_log(ctx, AV_LOG_DEBUG, "%d:%d %c\n", i, j, *p == '\n' ? 'N' : *p);
yading@11:             if (*p == '\n') {
yading@11:                 p++; break;
yading@11:             } else
yading@11:                 life->buf[0][i*life->w + j] = av_isgraph(*(p++)) ? ALIVE_CELL : 0;
yading@11:         }
yading@11:     }
yading@11:     life->buf_idx = 0;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int init(AVFilterContext *ctx)
yading@11: {
yading@11:     LifeContext *life = ctx->priv;
yading@11:     int ret;
yading@11: 
yading@11:     if (!life->w && !life->filename)
yading@11:         av_opt_set(life, "size", "320x240", 0);
yading@11: 
yading@11:     if ((ret = parse_rule(&life->born_rule, &life->stay_rule, life->rule_str, ctx)) < 0)
yading@11:         return ret;
yading@11: 
yading@11: #define PARSE_COLOR(name) do { \
yading@11:     if ((ret = av_parse_color(life->name ## _color, life->name ## _color_str, -1, ctx))) { \
yading@11:         av_log(ctx, AV_LOG_ERROR, "Invalid " #name " color '%s'\n", \
yading@11:                life->name ## _color_str); \
yading@11:         return ret; \
yading@11:     } \
yading@11:     av_freep(&life->name ## _color_str); \
yading@11: } while (0)
yading@11: 
yading@11:     PARSE_COLOR(life);
yading@11:     PARSE_COLOR(death);
yading@11:     PARSE_COLOR(mold);
yading@11: 
yading@11:     if (!life->mold && memcmp(life->mold_color, "\x00\x00\x00", 3))
yading@11:         av_log(ctx, AV_LOG_WARNING,
yading@11:                "Mold color is set while mold isn't, ignoring the color.\n");
yading@11: 
yading@11:     if (!life->filename) {
yading@11:         /* fill the grid randomly */
yading@11:         int i;
yading@11: 
yading@11:         if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) ||
yading@11:             !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {
yading@11:             av_free(life->buf[0]);
yading@11:             av_free(life->buf[1]);
yading@11:             return AVERROR(ENOMEM);
yading@11:         }
yading@11:         if (life->random_seed == -1)
yading@11:             life->random_seed = av_get_random_seed();
yading@11: 
yading@11:         av_lfg_init(&life->lfg, life->random_seed);
yading@11: 
yading@11:         for (i = 0; i < life->w * life->h; i++) {
yading@11:             double r = (double)av_lfg_get(&life->lfg) / UINT32_MAX;
yading@11:             if (r <= life->random_fill_ratio)
yading@11:                 life->buf[0][i] = ALIVE_CELL;
yading@11:         }
yading@11:         life->buf_idx = 0;
yading@11:     } else {
yading@11:         if ((ret = init_pattern_from_file(ctx)) < 0)
yading@11:             return ret;
yading@11:     }
yading@11: 
yading@11:     av_log(ctx, AV_LOG_VERBOSE,
yading@11:            "s:%dx%d r:%d/%d rule:%s stay_rule:%d born_rule:%d stitch:%d seed:%u\n",
yading@11:            life->w, life->h, life->frame_rate.num, life->frame_rate.den,
yading@11:            life->rule_str, life->stay_rule, life->born_rule, life->stitch,
yading@11:            life->random_seed);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static av_cold void uninit(AVFilterContext *ctx)
yading@11: {
yading@11:     LifeContext *life = ctx->priv;
yading@11: 
yading@11:     av_file_unmap(life->file_buf, life->file_bufsize);
yading@11:     av_freep(&life->rule_str);
yading@11:     av_freep(&life->buf[0]);
yading@11:     av_freep(&life->buf[1]);
yading@11: }
yading@11: 
yading@11: static int config_props(AVFilterLink *outlink)
yading@11: {
yading@11:     LifeContext *life = outlink->src->priv;
yading@11: 
yading@11:     outlink->w = life->w;
yading@11:     outlink->h = life->h;
yading@11:     outlink->time_base = av_inv_q(life->frame_rate);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static void evolve(AVFilterContext *ctx)
yading@11: {
yading@11:     LifeContext *life = ctx->priv;
yading@11:     int i, j;
yading@11:     uint8_t *oldbuf = life->buf[ life->buf_idx];
yading@11:     uint8_t *newbuf = life->buf[!life->buf_idx];
yading@11: 
yading@11:     enum { NW, N, NE, W, E, SW, S, SE };
yading@11: 
yading@11:     /* evolve the grid */
yading@11:     for (i = 0; i < life->h; i++) {
yading@11:         for (j = 0; j < life->w; j++) {
yading@11:             int pos[8][2], n, alive, cell;
yading@11:             if (life->stitch) {
yading@11:                 pos[NW][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NW][1] = (j-1) < 0 ? life->w-1 : j-1;
yading@11:                 pos[N ][0] = (i-1) < 0 ? life->h-1 : i-1; pos[N ][1] =                         j  ;
yading@11:                 pos[NE][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NE][1] = (j+1) == life->w ?  0 : j+1;
yading@11:                 pos[W ][0] =                         i  ; pos[W ][1] = (j-1) < 0 ? life->w-1 : j-1;
yading@11:                 pos[E ][0] =                         i  ; pos[E ][1] = (j+1) == life->w ? 0  : j+1;
yading@11:                 pos[SW][0] = (i+1) == life->h ?  0 : i+1; pos[SW][1] = (j-1) < 0 ? life->w-1 : j-1;
yading@11:                 pos[S ][0] = (i+1) == life->h ?  0 : i+1; pos[S ][1] =                         j  ;
yading@11:                 pos[SE][0] = (i+1) == life->h ?  0 : i+1; pos[SE][1] = (j+1) == life->w ?  0 : j+1;
yading@11:             } else {
yading@11:                 pos[NW][0] = (i-1) < 0 ? -1        : i-1; pos[NW][1] = (j-1) < 0 ? -1        : j-1;
yading@11:                 pos[N ][0] = (i-1) < 0 ? -1        : i-1; pos[N ][1] =                         j  ;
yading@11:                 pos[NE][0] = (i-1) < 0 ? -1        : i-1; pos[NE][1] = (j+1) == life->w ? -1 : j+1;
yading@11:                 pos[W ][0] =                         i  ; pos[W ][1] = (j-1) < 0 ? -1        : j-1;
yading@11:                 pos[E ][0] =                         i  ; pos[E ][1] = (j+1) == life->w ? -1 : j+1;
yading@11:                 pos[SW][0] = (i+1) == life->h ? -1 : i+1; pos[SW][1] = (j-1) < 0 ? -1        : j-1;
yading@11:                 pos[S ][0] = (i+1) == life->h ? -1 : i+1; pos[S ][1] =                         j  ;
yading@11:                 pos[SE][0] = (i+1) == life->h ? -1 : i+1; pos[SE][1] = (j+1) == life->w ? -1 : j+1;
yading@11:             }
yading@11: 
yading@11:             /* compute the number of live neighbor cells */
yading@11:             n = (pos[NW][0] == -1 || pos[NW][1] == -1 ? 0 : oldbuf[pos[NW][0]*life->w + pos[NW][1]] == ALIVE_CELL) +
yading@11:                 (pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]] == ALIVE_CELL) +
yading@11:                 (pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]] == ALIVE_CELL) +
yading@11:                 (pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]] == ALIVE_CELL) +
yading@11:                 (pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]] == ALIVE_CELL) +
yading@11:                 (pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]] == ALIVE_CELL) +
yading@11:                 (pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]] == ALIVE_CELL) +
yading@11:                 (pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]] == ALIVE_CELL);
yading@11:             cell  = oldbuf[i*life->w + j];
yading@11:             alive = 1<<n & (cell == ALIVE_CELL ? life->stay_rule : life->born_rule);
yading@11:             if (alive)     *newbuf = ALIVE_CELL; // new cell is alive
yading@11:             else if (cell) *newbuf = cell - 1;   // new cell is dead and in the process of mold
yading@11:             else           *newbuf = 0;          // new cell is definitely dead
yading@11:             av_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, cell, *newbuf);
yading@11:             newbuf++;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     life->buf_idx = !life->buf_idx;
yading@11: }
yading@11: 
yading@11: static void fill_picture_monoblack(AVFilterContext *ctx, AVFrame *picref)
yading@11: {
yading@11:     LifeContext *life = ctx->priv;
yading@11:     uint8_t *buf = life->buf[life->buf_idx];
yading@11:     int i, j, k;
yading@11: 
yading@11:     /* fill the output picture with the old grid buffer */
yading@11:     for (i = 0; i < life->h; i++) {
yading@11:         uint8_t byte = 0;
yading@11:         uint8_t *p = picref->data[0] + i * picref->linesize[0];
yading@11:         for (k = 0, j = 0; j < life->w; j++) {
yading@11:             byte |= (buf[i*life->w+j] == ALIVE_CELL)<<(7-k++);
yading@11:             if (k==8 || j == life->w-1) {
yading@11:                 k = 0;
yading@11:                 *p++ = byte;
yading@11:                 byte = 0;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: }
yading@11: 
yading@11: // divide by 255 and round to nearest
yading@11: // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
yading@11: #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
yading@11: 
yading@11: static void fill_picture_rgb(AVFilterContext *ctx, AVFrame *picref)
yading@11: {
yading@11:     LifeContext *life = ctx->priv;
yading@11:     uint8_t *buf = life->buf[life->buf_idx];
yading@11:     int i, j;
yading@11: 
yading@11:     /* fill the output picture with the old grid buffer */
yading@11:     for (i = 0; i < life->h; i++) {
yading@11:         uint8_t *p = picref->data[0] + i * picref->linesize[0];
yading@11:         for (j = 0; j < life->w; j++) {
yading@11:             uint8_t v = buf[i*life->w + j];
yading@11:             if (life->mold && v != ALIVE_CELL) {
yading@11:                 const uint8_t *c1 = life-> mold_color;
yading@11:                 const uint8_t *c2 = life->death_color;
yading@11:                 int death_age = FFMIN((0xff - v) * life->mold, 0xff);
yading@11:                 *p++ = FAST_DIV255((c2[0] << 8) + ((int)c1[0] - (int)c2[0]) * death_age);
yading@11:                 *p++ = FAST_DIV255((c2[1] << 8) + ((int)c1[1] - (int)c2[1]) * death_age);
yading@11:                 *p++ = FAST_DIV255((c2[2] << 8) + ((int)c1[2] - (int)c2[2]) * death_age);
yading@11:             } else {
yading@11:                 const uint8_t *c = v == ALIVE_CELL ? life->life_color : life->death_color;
yading@11:                 AV_WB24(p, c[0]<<16 | c[1]<<8 | c[2]);
yading@11:                 p += 3;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: }
yading@11: 
yading@11: static int request_frame(AVFilterLink *outlink)
yading@11: {
yading@11:     LifeContext *life = outlink->src->priv;
yading@11:     AVFrame *picref = ff_get_video_buffer(outlink, life->w, life->h);
yading@11:     if (!picref)
yading@11:         return AVERROR(ENOMEM);
yading@11:     picref->sample_aspect_ratio = (AVRational) {1, 1};
yading@11:     picref->pts = life->pts++;
yading@11: 
yading@11:     life->draw(outlink->src, picref);
yading@11:     evolve(outlink->src);
yading@11: #ifdef DEBUG
yading@11:     show_life_grid(outlink->src);
yading@11: #endif
yading@11:     return ff_filter_frame(outlink, picref);
yading@11: }
yading@11: 
yading@11: static int query_formats(AVFilterContext *ctx)
yading@11: {
yading@11:     LifeContext *life = ctx->priv;
yading@11:     enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_NONE, AV_PIX_FMT_NONE };
yading@11:     if (life->mold || memcmp(life-> life_color, "\xff\xff\xff", 3)
yading@11:                    || memcmp(life->death_color, "\x00\x00\x00", 3)) {
yading@11:         pix_fmts[0] = AV_PIX_FMT_RGB24;
yading@11:         life->draw = fill_picture_rgb;
yading@11:     } else {
yading@11:         pix_fmts[0] = AV_PIX_FMT_MONOBLACK;
yading@11:         life->draw = fill_picture_monoblack;
yading@11:     }
yading@11:     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static const AVFilterPad life_outputs[] = {
yading@11:     {
yading@11:         .name          = "default",
yading@11:         .type          = AVMEDIA_TYPE_VIDEO,
yading@11:         .request_frame = request_frame,
yading@11:         .config_props  = config_props,
yading@11:     },
yading@11:     { NULL}
yading@11: };
yading@11: 
yading@11: AVFilter avfilter_vsrc_life = {
yading@11:     .name        = "life",
yading@11:     .description = NULL_IF_CONFIG_SMALL("Create life."),
yading@11:     .priv_size = sizeof(LifeContext),
yading@11:     .init      = init,
yading@11:     .uninit    = uninit,
yading@11:     .query_formats = query_formats,
yading@11:     .inputs        = NULL,
yading@11:     .outputs       = life_outputs,
yading@11:     .priv_class    = &life_class,
yading@11: };