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FFmpeg/libavfilter/vsrc_life.c

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  1. /*

  2.  * Copyright (c) Stefano Sabatini 2010

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. /**

  22.  * @file

  23.  * life video source, based on John Conways' Life Game

  24.  */

  25. 

  26. /* #define DEBUG */

  27. 

  28. #include "libavutil/file.h"

  29. #include "libavutil/intreadwrite.h"

  30. #include "libavutil/lfg.h"

  31. #include "libavutil/opt.h"

  32. #include "libavutil/parseutils.h"

  33. #include "libavutil/random_seed.h"

  34. #include "avfilter.h"

  35. 

  36. typedef struct {

  37.     const AVClass *class;

  38.     int w, h;

  39.     char *filename;

  40.     char *rule_str;

  41.     uint8_t *file_buf;

  42.     size_t file_bufsize;

  43. 

  44.     /**

  45.      * The two grid state buffers.

  46.      *

  47.      * A 0xFF (ALIVE_CELL) value means the cell is alive (or new born), while

  48.      * the decreasing values from 0xFE to 0 means the cell is dead; the range

  49.      * of values is used for the slow death effect, or mold (0xFE means dead,

  50.      * 0xFD means very dead, 0xFC means very very dead... and 0x00 means

  51.      * definitely dead/mold).

  52.      */

  53.     uint8_t *buf[2];

  54. 

  55.     uint8_t  buf_idx;

  56.     uint16_t stay_rule;         ///< encode the behavior for filled cells

  57.     uint16_t born_rule;         ///< encode the behavior for empty cells

  58.     uint64_t pts;

  59.     AVRational time_base;

  60.     char *size;                 ///< video frame size

  61.     char *rate;                 ///< video frame rate

  62.     double   random_fill_ratio;

  63.     uint32_t random_seed;

  64.     int stitch;

  65.     int mold;

  66.     char  *life_color_str;

  67.     char *death_color_str;

  68.     char  *mold_color_str;

  69.     uint8_t  life_color[4];

  70.     uint8_t death_color[4];

  71.     uint8_t  mold_color[4];

  72.     AVLFG lfg;

  73.     void (*draw)(AVFilterContext*, AVFilterBufferRef*);

  74. } LifeContext;

  75. 

  76. #define ALIVE_CELL 0xFF

  77. #define OFFSET(x) offsetof(LifeContext, x)

  78. 

  79. static const AVOption life_options[] = {

  80.     { "filename", "set source file",  OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },

  81.     { "f",        "set source file",  OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },

  82.     { "size",     "set video size",   OFFSET(size),     AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },

  83.     { "s",        "set video size",   OFFSET(size),     AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },

  84.     { "rate",     "set video rate",   OFFSET(rate),     AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },

  85.     { "r",        "set video rate",   OFFSET(rate),     AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },

  86.     { "rule",     "set rule",         OFFSET(rule_str), AV_OPT_TYPE_STRING, {.str = "B3/S23"}, CHAR_MIN, CHAR_MAX },

  87.     { "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 },

  88.     { "ratio",             "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1/M_PHI}, 0, 1 },

  89.     { "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX },

  90.     { "seed",        "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX },

  91.     { "stitch",      "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_INT, {.dbl=1}, 0, 1 },

  92.     { "mold",        "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.dbl=0}, 0, 0xFF },

  93.     { "life_color",  "set life color",  OFFSET( life_color_str), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },

  94.     { "death_color", "set death color", OFFSET(death_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },

  95.     { "mold_color",  "set mold color",  OFFSET( mold_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },

  96.     { NULL },

  97. };

  98. 

  99. static const char *life_get_name(void *ctx)

  100. {

  101.     return "life";

  102. }

  103. 

  104. static const AVClass life_class = {

  105.     "LifeContext",

  106.     life_get_name,

  107.     life_options

  108. };

  109. 

  110. static int parse_rule(uint16_t *born_rule, uint16_t *stay_rule,

  111.                       const char *rule_str, void *log_ctx)

  112. {

  113.     char *tail;

  114.     const char *p = rule_str;

  115.     *born_rule = 0;

  116.     *stay_rule = 0;

  117. 

  118.     if (strchr("bBsS", *p)) {

  119.         /* parse rule as a Born / Stay Alive code, see

  120.          * http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life */

  121.         do {

  122.             uint16_t *rule = (*p == 'b' || *p == 'B') ? born_rule : stay_rule;

  123.             p++;

  124.             while (*p >= '0' && *p <= '8') {

  125.                 *rule += 1<<(*p - '0');

  126.                 p++;

  127.             }

  128.             if (*p != '/')

  129.                 break;

  130.             p++;

  131.         } while (strchr("bBsS", *p));

  132. 

  133.         if (*p)

  134.             goto error;

  135.     } else {

  136.         /* parse rule as a number, expressed in the form STAY|(BORN<<9),

  137.          * where STAY and BORN encode the corresponding 9-bits rule */

  138.         long int rule = strtol(rule_str, &tail, 10);

  139.         if (*tail)

  140.             goto error;

  141.         *born_rule  = ((1<<9)-1) & rule;

  142.         *stay_rule = rule >> 9;

  143.     }

  144. 

  145.     return 0;

  146. 

  147. error:

  148.     av_log(log_ctx, AV_LOG_ERROR, "Invalid rule code '%s' provided\n", rule_str);

  149.     return AVERROR(EINVAL);

  150. }

  151. 

  152. #ifdef DEBUG

  153. static void show_life_grid(AVFilterContext *ctx)

  154. {

  155.     LifeContext *life = ctx->priv;

  156.     int i, j;

  157. 

  158.     char *line = av_malloc(life->w + 1);

  159.     if (!line)

  160.         return;

  161.     for (i = 0; i < life->h; i++) {

  162.         for (j = 0; j < life->w; j++)

  163.             line[j] = life->buf[life->buf_idx][i*life->w + j] == ALIVE_CELL ? '@' : ' ';

  164.         line[j] = 0;

  165.         av_log(ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);

  166.     }

  167.     av_free(line);

  168. }

  169. #endif

  170. 

  171. static int init_pattern_from_file(AVFilterContext *ctx)

  172. {

  173.     LifeContext *life = ctx->priv;

  174.     char *p;

  175.     int ret, i, i0, j, h = 0, w, max_w = 0;

  176. 

  177.     if ((ret = av_file_map(life->filename, &life->file_buf, &life->file_bufsize,

  178.                            0, ctx)) < 0)

  179.         return ret;

  180.     av_freep(&life->filename);

  181. 

  182.     /* prescan file to get the number of lines and the maximum width */

  183.     w = 0;

  184.     for (i = 0; i < life->file_bufsize; i++) {

  185.         if (life->file_buf[i] == '\n') {

  186.             h++; max_w = FFMAX(w, max_w); w = 0;

  187.         } else {

  188.             w++;

  189.         }

  190.     }

  191.     av_log(ctx, AV_LOG_DEBUG, "h:%d max_w:%d\n", h, max_w);

  192. 

  193.     if (life->size) {

  194.         if (max_w > life->w || h > life->h) {

  195.             av_log(ctx, AV_LOG_ERROR,

  196.                    "The specified size is %dx%d which cannot contain the provided file size of %dx%d\n",

  197.                    life->w, life->h, max_w, h);

  198.             return AVERROR(EINVAL);

  199.         }

  200.     } else {

  201.         /* size was not specified, set it to size of the grid */

  202.         life->w = max_w;

  203.         life->h = h;

  204.     }

  205. 

  206.     if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) ||

  207.         !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {

  208.         av_free(life->buf[0]);

  209.         av_free(life->buf[1]);

  210.         return AVERROR(ENOMEM);

  211.     }

  212. 

  213.     /* fill buf[0] */

  214.     p = life->file_buf;

  215.     for (i0 = 0, i = (life->h - h)/2; i0 < h; i0++, i++) {

  216.         for (j = (life->w - max_w)/2;; j++) {

  217.             av_log(ctx, AV_LOG_DEBUG, "%d:%d %c\n", i, j, *p == '\n' ? 'N' : *p);

  218.             if (*p == '\n') {

  219.                 p++; break;

  220.             } else

  221.                 life->buf[0][i*life->w + j] = isgraph(*(p++)) ? ALIVE_CELL : 0;

  222.         }

  223.     }

  224.     life->buf_idx = 0;

  225. 

  226.     return 0;

  227. }

  228. 

  229. static int init(AVFilterContext *ctx, const char *args, void *opaque)

  230. {

  231.     LifeContext *life = ctx->priv;

  232.     AVRational frame_rate;

  233.     int ret;

  234. 

  235.     life->class = &life_class;

  236.     av_opt_set_defaults(life);

  237. 

  238.     if ((ret = av_set_options_string(life, args, "=", ":")) < 0) {

  239.         av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);

  240.         return ret;

  241.     }

  242. 

  243.     if ((ret = av_parse_video_rate(&frame_rate, life->rate)) < 0) {

  244.         av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", life->rate);

  245.         return AVERROR(EINVAL);

  246.     }

  247.     av_freep(&life->rate);

  248. 

  249.     if (!life->size && !life->filename)

  250.         av_opt_set(life, "size", "320x240", 0);

  251. 

  252.     if (life->size &&

  253.         (ret = av_parse_video_size(&life->w, &life->h, life->size)) < 0) {

  254.         av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", life->size);

  255.         return ret;

  256.     }

  257.     av_freep(&life->size);

  258. 

  259.     if ((ret = parse_rule(&life->born_rule, &life->stay_rule, life->rule_str, ctx)) < 0)

  260.         return ret;

  261. 

  262. #define PARSE_COLOR(name) do { \

  263.     if ((ret = av_parse_color(life->name ## _color, life->name ## _color_str, -1, ctx))) { \

  264.         av_log(ctx, AV_LOG_ERROR, "Invalid " #name " color '%s'\n", \

  265.                life->name ## _color_str); \

  266.         return ret; \

  267.     } \

  268.     av_freep(&life->name ## _color_str); \

  269. } while (0)

  270. 

  271.     PARSE_COLOR(life);

  272.     PARSE_COLOR(death);

  273.     PARSE_COLOR(mold);

  274. 

  275.     if (!life->mold && memcmp(life->mold_color, "\x00\x00\x00", 3))

  276.         av_log(ctx, AV_LOG_WARNING,

  277.                "Mold color is set while mold isn't, ignoring the color.\n");

  278. 

  279.     life->time_base.num = frame_rate.den;

  280.     life->time_base.den = frame_rate.num;

  281. 

  282.     if (!life->filename) {

  283.         /* fill the grid randomly */

  284.         int i;

  285. 

  286.         if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) ||

  287.             !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {

  288.             av_free(life->buf[0]);

  289.             av_free(life->buf[1]);

  290.             return AVERROR(ENOMEM);

  291.         }

  292.         if (life->random_seed == -1)

  293.             life->random_seed = av_get_random_seed();

  294. 

  295.         av_lfg_init(&life->lfg, life->random_seed);

  296. 

  297.         for (i = 0; i < life->w * life->h; i++) {

  298.             double r = (double)av_lfg_get(&life->lfg) / UINT32_MAX;

  299.             if (r <= life->random_fill_ratio)

  300.                 life->buf[0][i] = ALIVE_CELL;

  301.         }

  302.         life->buf_idx = 0;

  303.     } else {

  304.         if ((ret = init_pattern_from_file(ctx)) < 0)

  305.             return ret;

  306.     }

  307. 

  308.     av_log(ctx, AV_LOG_INFO,

  309.            "s:%dx%d r:%d/%d rule:%s stay_rule:%d born_rule:%d stitch:%d seed:%u\n",

  310.            life->w, life->h, frame_rate.num, frame_rate.den,

  311.            life->rule_str, life->stay_rule, life->born_rule, life->stitch,

  312.            life->random_seed);

  313.     return 0;

  314. }

  315. 

  316. static av_cold void uninit(AVFilterContext *ctx)

  317. {

  318.     LifeContext *life = ctx->priv;

  319. 

  320.     av_file_unmap(life->file_buf, life->file_bufsize);

  321.     av_freep(&life->rule_str);

  322.     av_freep(&life->buf[0]);

  323.     av_freep(&life->buf[1]);

  324. }

  325. 

  326. static int config_props(AVFilterLink *outlink)

  327. {

  328.     LifeContext *life = outlink->src->priv;

  329. 

  330.     outlink->w = life->w;

  331.     outlink->h = life->h;

  332.     outlink->time_base = life->time_base;

  333. 

  334.     return 0;

  335. }

  336. 

  337. static void evolve(AVFilterContext *ctx)

  338. {

  339.     LifeContext *life = ctx->priv;

  340.     int i, j;

  341.     uint8_t *oldbuf = life->buf[ life->buf_idx];

  342.     uint8_t *newbuf = life->buf[!life->buf_idx];

  343. 

  344.     enum { NW, N, NE, W, E, SW, S, SE };

  345. 

  346.     /* evolve the grid */

  347.     for (i = 0; i < life->h; i++) {

  348.         for (j = 0; j < life->w; j++) {

  349.             int pos[8][2], n, alive, cell;

  350.             if (life->stitch) {

  351.                 pos[NW][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NW][1] = (j-1) < 0 ? life->w-1 : j-1;

  352.                 pos[N ][0] = (i-1) < 0 ? life->h-1 : i-1; pos[N ][1] =                         j  ;

  353.                 pos[NE][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NE][1] = (j+1) == life->w ?  0 : j+1;

  354.                 pos[W ][0] =                         i  ; pos[W ][1] = (j-1) < 0 ? life->w-1 : j-1;

  355.                 pos[E ][0] =                         i  ; pos[E ][1] = (j+1) == life->w ? 0  : j+1;

  356.                 pos[SW][0] = (i+1) == life->h ?  0 : i+1; pos[SW][1] = (j-1) < 0 ? life->w-1 : j-1;

  357.                 pos[S ][0] = (i+1) == life->h ?  0 : i+1; pos[S ][1] =                         j  ;

  358.                 pos[SE][0] = (i+1) == life->h ?  0 : i+1; pos[SE][1] = (j+1) == life->w ?  0 : j+1;

  359.             } else {

  360.                 pos[NW][0] = (i-1) < 0 ? -1        : i-1; pos[NW][1] = (j-1) < 0 ? -1        : j-1;

  361.                 pos[N ][0] = (i-1) < 0 ? -1        : i-1; pos[N ][1] =                         j  ;

  362.                 pos[NE][0] = (i-1) < 0 ? -1        : i-1; pos[NE][1] = (j+1) == life->w ? -1 : j+1;

  363.                 pos[W ][0] =                         i  ; pos[W ][1] = (j-1) < 0 ? -1        : j-1;

  364.                 pos[E ][0] =                         i  ; pos[E ][1] = (j+1) == life->w ? -1 : j+1;

  365.                 pos[SW][0] = (i+1) == life->h ? -1 : i+1; pos[SW][1] = (j-1) < 0 ? -1        : j-1;

  366.                 pos[S ][0] = (i+1) == life->h ? -1 : i+1; pos[S ][1] =                         j  ;

  367.                 pos[SE][0] = (i+1) == life->h ? -1 : i+1; pos[SE][1] = (j+1) == life->w ? -1 : j+1;

  368.             }

  369. 

  370.             /* compute the number of live neighbor cells */

  371.             n = (pos[NW][0] == -1 || pos[NW][1] == -1 ? 0 : oldbuf[pos[NW][0]*life->w + pos[NW][1]] == ALIVE_CELL) +

  372.                 (pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]] == ALIVE_CELL) +

  373.                 (pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]] == ALIVE_CELL) +

  374.                 (pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]] == ALIVE_CELL) +

  375.                 (pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]] == ALIVE_CELL) +

  376.                 (pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]] == ALIVE_CELL) +

  377.                 (pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]] == ALIVE_CELL) +

  378.                 (pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]] == ALIVE_CELL);

  379.             cell  = oldbuf[i*life->w + j];

  380.             alive = 1<<n & (cell == ALIVE_CELL ? life->stay_rule : life->born_rule);

  381.             if (alive)     *newbuf = ALIVE_CELL; // new cell is alive

  382.             else if (cell) *newbuf = cell - 1;   // new cell is dead and in the process of mold

  383.             else           *newbuf = 0;          // new cell is definitely dead

  384.             av_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, cell, *newbuf);

  385.             newbuf++;

  386.         }

  387.     }

  388. 

  389.     life->buf_idx = !life->buf_idx;

  390. }

  391. 

  392. static void fill_picture_monoblack(AVFilterContext *ctx, AVFilterBufferRef *picref)

  393. {

  394.     LifeContext *life = ctx->priv;

  395.     uint8_t *buf = life->buf[life->buf_idx];

  396.     int i, j, k;

  397. 

  398.     /* fill the output picture with the old grid buffer */

  399.     for (i = 0; i < life->h; i++) {

  400.         uint8_t byte = 0;

  401.         uint8_t *p = picref->data[0] + i * picref->linesize[0];

  402.         for (k = 0, j = 0; j < life->w; j++) {

  403.             byte |= (buf[i*life->w+j] == ALIVE_CELL)<<(7-k++);

  404.             if (k==8 || j == life->w-1) {

  405.                 k = 0;

  406.                 *p++ = byte;

  407.                 byte = 0;

  408.             }

  409.         }

  410.     }

  411. }

  412. 

  413. // divide by 255 and round to nearest

  414. // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16

  415. #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)

  416. 

  417. static void fill_picture_rgb(AVFilterContext *ctx, AVFilterBufferRef *picref)

  418. {

  419.     LifeContext *life = ctx->priv;

  420.     uint8_t *buf = life->buf[life->buf_idx];

  421.     int i, j;

  422. 

  423.     /* fill the output picture with the old grid buffer */

  424.     for (i = 0; i < life->h; i++) {

  425.         uint8_t *p = picref->data[0] + i * picref->linesize[0];

  426.         for (j = 0; j < life->w; j++) {

  427.             uint8_t v = buf[i*life->w + j];

  428.             if (life->mold && v != ALIVE_CELL) {

  429.                 const uint8_t *c1 = life-> mold_color;

  430.                 const uint8_t *c2 = life->death_color;

  431.                 int death_age = FFMIN((0xff - v) * life->mold, 0xff);

  432.                 *p++ = FAST_DIV255((c2[0] << 8) + ((int)c1[0] - (int)c2[0]) * death_age);

  433.                 *p++ = FAST_DIV255((c2[1] << 8) + ((int)c1[1] - (int)c2[1]) * death_age);

  434.                 *p++ = FAST_DIV255((c2[2] << 8) + ((int)c1[2] - (int)c2[2]) * death_age);

  435.             } else {

  436.                 const uint8_t *c = v == ALIVE_CELL ? life->life_color : life->death_color;

  437.                 AV_WB24(p, c[0]<<16 | c[1]<<8 | c[2]);

  438.                 p += 3;

  439.             }

  440.         }

  441.     }

  442. }

  443. 

  444. static int request_frame(AVFilterLink *outlink)

  445. {

  446.     LifeContext *life = outlink->src->priv;

  447.     AVFilterBufferRef *picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, life->w, life->h);

  448.     picref->video->sample_aspect_ratio = (AVRational) {1, 1};

  449.     picref->pts = life->pts++;

  450.     picref->pos = -1;

  451. 

  452.     life->draw(outlink->src, picref);

  453.     evolve(outlink->src);

  454. #ifdef DEBUG

  455.     show_life_grid(outlink->src);

  456. #endif

  457. 

  458.     avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));

  459.     avfilter_draw_slice(outlink, 0, life->h, 1);

  460.     avfilter_end_frame(outlink);

  461.     avfilter_unref_buffer(picref);

  462. 

  463.     return 0;

  464. }

  465. 

  466. static int query_formats(AVFilterContext *ctx)

  467. {

  468.     LifeContext *life = ctx->priv;

  469.     enum PixelFormat pix_fmts[] = { PIX_FMT_NONE, PIX_FMT_NONE };

  470.     if (life->mold || memcmp(life-> life_color, "\xff\xff\xff", 3)

  471.                    || memcmp(life->death_color, "\x00\x00\x00", 3)) {

  472.         pix_fmts[0] = PIX_FMT_RGB24;

  473.         life->draw = fill_picture_rgb;

  474.     } else {

  475.         pix_fmts[0] = PIX_FMT_MONOBLACK;

  476.         life->draw = fill_picture_monoblack;

  477.     }

  478.     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));

  479.     return 0;

  480. }

  481. 

  482. AVFilter avfilter_vsrc_life = {

  483.     .name        = "life",

  484.     .description = NULL_IF_CONFIG_SMALL("Create life."),

  485.     .priv_size = sizeof(LifeContext),

  486.     .init      = init,

  487.     .uninit    = uninit,

  488.     .query_formats = query_formats,

  489. 

  490.     .inputs    = (const AVFilterPad[]) {

  491.         { .name = NULL}

  492.     },

  493.     .outputs   = (const AVFilterPad[]) {

  494.         { .name            = "default",

  495.           .type            = AVMEDIA_TYPE_VIDEO,

  496.           .request_frame   = request_frame,

  497.           .config_props    = config_props },

  498.         { .name = NULL}

  499.     },

  500. };