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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 "libavutil/avstring.h"

  35. #include "avfilter.h"

  36. #include "internal.h"

  37. #include "formats.h"

  38. #include "video.h"

  39. 

  40. typedef struct {

  41.     const AVClass *class;

  42.     int w, h;

  43.     char *filename;

  44.     char *rule_str;

  45.     uint8_t *file_buf;

  46.     size_t file_bufsize;

  47. 

  48.     /**

  49.      * The two grid state buffers.

  50.      *

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

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

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

  54.      * 0xFD means very dead, 0xFC means very very dead... and 0x00 means

  55.      * definitely dead/mold).

  56.      */

  57.     uint8_t *buf[2];

  58. 

  59.     uint8_t  buf_idx;

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

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

  62.     uint64_t pts;

  63.     AVRational time_base;

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

  65.     double   random_fill_ratio;

  66.     uint32_t random_seed;

  67.     int stitch;

  68.     int mold;

  69.     char  *life_color_str;

  70.     char *death_color_str;

  71.     char  *mold_color_str;

  72.     uint8_t  life_color[4];

  73.     uint8_t death_color[4];

  74.     uint8_t  mold_color[4];

  75.     AVLFG lfg;

  76.     void (*draw)(AVFilterContext*, AVFrame*);

  77. } LifeContext;

  78. 

  79. #define ALIVE_CELL 0xFF

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

  81. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

  82. 

  83. static const AVOption life_options[] = {

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

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

  86.     { "size",     "set video size",   OFFSET(w),        AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },

  87.     { "s",        "set video size",   OFFSET(w),        AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, FLAGS },

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

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

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

  91.     { "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 },

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

  93.     { "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, UINT32_MAX, FLAGS },

  94.     { "seed",        "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, UINT32_MAX, FLAGS },

  95.     { "stitch",      "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },

  96.     { "mold",        "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.i64=0}, 0, 0xFF, FLAGS },

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

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

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

  100.     { NULL },

  101. };

  102. 

  103. AVFILTER_DEFINE_CLASS(life);

  104. 

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

  106.                       const char *rule_str, void *log_ctx)

  107. {

  108.     char *tail;

  109.     const char *p = rule_str;

  110.     *born_rule = 0;

  111.     *stay_rule = 0;

  112. 

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

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

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

  116.         do {

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

  118.             p++;

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

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

  121.                 p++;

  122.             }

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

  124.                 break;

  125.             p++;

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

  127. 

  128.         if (*p)

  129.             goto error;

  130.     } else {

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

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

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

  134.         if (*tail)

  135.             goto error;

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

  137.         *stay_rule = rule >> 9;

  138.     }

  139. 

  140.     return 0;

  141. 

  142. error:

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

  144.     return AVERROR(EINVAL);

  145. }

  146. 

  147. #ifdef DEBUG

  148. static void show_life_grid(AVFilterContext *ctx)

  149. {

  150.     LifeContext *life = ctx->priv;

  151.     int i, j;

  152. 

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

  154.     if (!line)

  155.         return;

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

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

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

  159.         line[j] = 0;

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

  161.     }

  162.     av_free(line);

  163. }

  164. #endif

  165. 

  166. static int init_pattern_from_file(AVFilterContext *ctx)

  167. {

  168.     LifeContext *life = ctx->priv;

  169.     char *p;

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

  171. 

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

  173.                            0, ctx)) < 0)

  174.         return ret;

  175.     av_freep(&life->filename);

  176. 

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

  178.     w = 0;

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

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

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

  182.         } else {

  183.             w++;

  184.         }

  185.     }

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

  187. 

  188.     if (life->w) {

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

  190.             av_log(ctx, AV_LOG_ERROR,

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

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

  193.             return AVERROR(EINVAL);

  194.         }

  195.     } else {

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

  197.         life->w = max_w;

  198.         life->h = h;

  199.     }

  200. 

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

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

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

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

  205.         return AVERROR(ENOMEM);

  206.     }

  207. 

  208.     /* fill buf[0] */

  209.     p = life->file_buf;

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

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

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

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

  214.                 p++; break;

  215.             } else

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

  217.         }

  218.     }

  219.     life->buf_idx = 0;

  220. 

  221.     return 0;

  222. }

  223. 

  224. static int init(AVFilterContext *ctx, const char *args)

  225. {

  226.     LifeContext *life = ctx->priv;

  227.     AVRational frame_rate;

  228.     int ret;

  229. 

  230.     life->class = &life_class;

  231.     av_opt_set_defaults(life);

  232. 

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

  234.         return ret;

  235. 

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

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

  238.         return AVERROR(EINVAL);

  239.     }

  240.     av_freep(&life->rate);

  241. 

  242.     if (!life->w && !life->filename)

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

  244. 

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

  246.         return ret;

  247. 

  248. #define PARSE_COLOR(name) do { \

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

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

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

  252.         return ret; \

  253.     } \

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

  255. } while (0)

  256. 

  257.     PARSE_COLOR(life);

  258.     PARSE_COLOR(death);

  259.     PARSE_COLOR(mold);

  260. 

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

  262.         av_log(ctx, AV_LOG_WARNING,

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

  264. 

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

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

  267. 

  268.     if (!life->filename) {

  269.         /* fill the grid randomly */

  270.         int i;

  271. 

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

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

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

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

  276.             return AVERROR(ENOMEM);

  277.         }

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

  279.             life->random_seed = av_get_random_seed();

  280. 

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

  282. 

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

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

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

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

  287.         }

  288.         life->buf_idx = 0;

  289.     } else {

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

  291.             return ret;

  292.     }

  293. 

  294.     av_log(ctx, AV_LOG_VERBOSE,

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

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

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

  298.            life->random_seed);

  299.     return 0;

  300. }

  301. 

  302. static av_cold void uninit(AVFilterContext *ctx)

  303. {

  304.     LifeContext *life = ctx->priv;

  305. 

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

  307.     av_freep(&life->rule_str);

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

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

  310. }

  311. 

  312. static int config_props(AVFilterLink *outlink)

  313. {

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

  315. 

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

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

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

  319. 

  320.     return 0;

  321. }

  322. 

  323. static void evolve(AVFilterContext *ctx)

  324. {

  325.     LifeContext *life = ctx->priv;

  326.     int i, j;

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

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

  329. 

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

  331. 

  332.     /* evolve the grid */

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

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

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

  336.             if (life->stitch) {

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

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

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

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

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

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

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

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

  345.             } else {

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

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

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

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

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

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

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

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

  354.             }

  355. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  371.             newbuf++;

  372.         }

  373.     }

  374. 

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

  376. }

  377. 

  378. static void fill_picture_monoblack(AVFilterContext *ctx, AVFrame *picref)

  379. {

  380.     LifeContext *life = ctx->priv;

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

  382.     int i, j, k;

  383. 

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

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

  386.         uint8_t byte = 0;

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

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

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

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

  391.                 k = 0;

  392.                 *p++ = byte;

  393.                 byte = 0;

  394.             }

  395.         }

  396.     }

  397. }

  398. 

  399. // divide by 255 and round to nearest

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

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

  402. 

  403. static void fill_picture_rgb(AVFilterContext *ctx, AVFrame *picref)

  404. {

  405.     LifeContext *life = ctx->priv;

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

  407.     int i, j;

  408. 

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

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

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

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

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

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

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

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

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

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

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

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

  421.             } else {

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

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

  424.                 p += 3;

  425.             }

  426.         }

  427.     }

  428. }

  429. 

  430. static int request_frame(AVFilterLink *outlink)

  431. {

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

  433.     AVFrame *picref = ff_get_video_buffer(outlink, life->w, life->h);

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

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

  436. 

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

  438.     evolve(outlink->src);

  439. #ifdef DEBUG

  440.     show_life_grid(outlink->src);

  441. #endif

  442.     return ff_filter_frame(outlink, picref);

  443. }

  444. 

  445. static int query_formats(AVFilterContext *ctx)

  446. {

  447.     LifeContext *life = ctx->priv;

  448.     enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_NONE, AV_PIX_FMT_NONE };

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

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

  451.         pix_fmts[0] = AV_PIX_FMT_RGB24;

  452.         life->draw = fill_picture_rgb;

  453.     } else {

  454.         pix_fmts[0] = AV_PIX_FMT_MONOBLACK;

  455.         life->draw = fill_picture_monoblack;

  456.     }

  457.     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

  458.     return 0;

  459. }

  460. 

  461. static const AVFilterPad life_outputs[] = {

  462.     {

  463.         .name          = "default",

  464.         .type          = AVMEDIA_TYPE_VIDEO,

  465.         .request_frame = request_frame,

  466.         .config_props  = config_props,

  467.     },

  468.     { NULL}

  469. };

  470. 

  471. AVFilter avfilter_vsrc_life = {

  472.     .name        = "life",

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

  474.     .priv_size = sizeof(LifeContext),

  475.     .init      = init,

  476.     .uninit    = uninit,

  477.     .query_formats = query_formats,

  478.     .inputs        = NULL,

  479.     .outputs       = life_outputs,

  480.     .priv_class    = &life_class,

  481. };