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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. #include "formats.h"

  36. #include "video.h"

  37. 

  38. typedef struct {

  39.     const AVClass *class;

  40.     int w, h;

  41.     char *filename;

  42.     char *rule_str;

  43.     uint8_t *file_buf;

  44.     size_t file_bufsize;

  45. 

  46.     /**

  47.      * The two grid state buffers.

  48.      *

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

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

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

  52.      * 0xFD means very dead, 0xFC means very very dead... and 0x00 means

  53.      * definitely dead/mold).

  54.      */

  55.     uint8_t *buf[2];

  56. 

  57.     uint8_t  buf_idx;

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

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

  60.     uint64_t pts;

  61.     AVRational time_base;

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

  63.     double   random_fill_ratio;

  64.     uint32_t random_seed;

  65.     int stitch;

  66.     int mold;

  67.     char  *life_color_str;

  68.     char *death_color_str;

  69.     char  *mold_color_str;

  70.     uint8_t  life_color[4];

  71.     uint8_t death_color[4];

  72.     uint8_t  mold_color[4];

  73.     AVLFG lfg;

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

  75. } LifeContext;

  76. 

  77. #define ALIVE_CELL 0xFF

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

  79. 

  80. static const AVOption life_options[] = {

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

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

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

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

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

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

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

  88.     { "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 },

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

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

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

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

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

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

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

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

  97.     { NULL },

  98. };

  99. 

  100. static const AVClass life_class = {

  101.     "LifeContext",

  102.     av_default_item_name,

  103.     life_options

  104. };

  105. 

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

  107.                       const char *rule_str, void *log_ctx)

  108. {

  109.     char *tail;

  110.     const char *p = rule_str;

  111.     *born_rule = 0;

  112.     *stay_rule = 0;

  113. 

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

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

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

  117.         do {

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

  119.             p++;

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

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

  122.                 p++;

  123.             }

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

  125.                 break;

  126.             p++;

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

  128. 

  129.         if (*p)

  130.             goto error;

  131.     } else {

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

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

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

  135.         if (*tail)

  136.             goto error;

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

  138.         *stay_rule = rule >> 9;

  139.     }

  140. 

  141.     return 0;

  142. 

  143. error:

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

  145.     return AVERROR(EINVAL);

  146. }

  147. 

  148. #ifdef DEBUG

  149. static void show_life_grid(AVFilterContext *ctx)

  150. {

  151.     LifeContext *life = ctx->priv;

  152.     int i, j;

  153. 

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

  155.     if (!line)

  156.         return;

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

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

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

  160.         line[j] = 0;

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

  162.     }

  163.     av_free(line);

  164. }

  165. #endif

  166. 

  167. static int init_pattern_from_file(AVFilterContext *ctx)

  168. {

  169.     LifeContext *life = ctx->priv;

  170.     char *p;

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

  172. 

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

  174.                            0, ctx)) < 0)

  175.         return ret;

  176.     av_freep(&life->filename);

  177. 

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

  179.     w = 0;

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

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

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

  183.         } else {

  184.             w++;

  185.         }

  186.     }

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

  188. 

  189.     if (life->w) {

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

  191.             av_log(ctx, AV_LOG_ERROR,

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

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

  194.             return AVERROR(EINVAL);

  195.         }

  196.     } else {

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

  198.         life->w = max_w;

  199.         life->h = h;

  200.     }

  201. 

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

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

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

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

  206.         return AVERROR(ENOMEM);

  207.     }

  208. 

  209.     /* fill buf[0] */

  210.     p = life->file_buf;

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

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

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

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

  215.                 p++; break;

  216.             } else

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

  218.         }

  219.     }

  220.     life->buf_idx = 0;

  221. 

  222.     return 0;

  223. }

  224. 

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

  226. {

  227.     LifeContext *life = ctx->priv;

  228.     AVRational frame_rate;

  229.     int ret;

  230. 

  231.     life->class = &life_class;

  232.     av_opt_set_defaults(life);

  233. 

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

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

  236.         return ret;

  237.     }

  238. 

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

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

  241.         return AVERROR(EINVAL);

  242.     }

  243.     av_freep(&life->rate);

  244. 

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

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

  247. 

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

  249.         return ret;

  250. 

  251. #define PARSE_COLOR(name) do { \

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

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

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

  255.         return ret; \

  256.     } \

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

  258. } while (0)

  259. 

  260.     PARSE_COLOR(life);

  261.     PARSE_COLOR(death);

  262.     PARSE_COLOR(mold);

  263. 

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

  265.         av_log(ctx, AV_LOG_WARNING,

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

  267. 

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

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

  270. 

  271.     if (!life->filename) {

  272.         /* fill the grid randomly */

  273.         int i;

  274. 

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

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

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

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

  279.             return AVERROR(ENOMEM);

  280.         }

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

  282.             life->random_seed = av_get_random_seed();

  283. 

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

  285. 

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

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

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

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

  290.         }

  291.         life->buf_idx = 0;

  292.     } else {

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

  294.             return ret;

  295.     }

  296. 

  297.     av_log(ctx, AV_LOG_INFO,

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

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

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

  301.            life->random_seed);

  302.     return 0;

  303. }

  304. 

  305. static av_cold void uninit(AVFilterContext *ctx)

  306. {

  307.     LifeContext *life = ctx->priv;

  308. 

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

  310.     av_freep(&life->rule_str);

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

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

  313. }

  314. 

  315. static int config_props(AVFilterLink *outlink)

  316. {

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

  318. 

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

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

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

  322. 

  323.     return 0;

  324. }

  325. 

  326. static void evolve(AVFilterContext *ctx)

  327. {

  328.     LifeContext *life = ctx->priv;

  329.     int i, j;

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

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

  332. 

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

  334. 

  335.     /* evolve the grid */

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

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

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

  339.             if (life->stitch) {

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

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

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

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

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

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

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

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

  348.             } else {

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

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

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

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

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

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

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

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

  357.             }

  358. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  374.             newbuf++;

  375.         }

  376.     }

  377. 

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

  379. }

  380. 

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

  382. {

  383.     LifeContext *life = ctx->priv;

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

  385.     int i, j, k;

  386. 

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

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

  389.         uint8_t byte = 0;

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

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

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

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

  394.                 k = 0;

  395.                 *p++ = byte;

  396.                 byte = 0;

  397.             }

  398.         }

  399.     }

  400. }

  401. 

  402. // divide by 255 and round to nearest

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

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

  405. 

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

  407. {

  408.     LifeContext *life = ctx->priv;

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

  410.     int i, j;

  411. 

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

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

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

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

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

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

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

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

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

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

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

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

  424.             } else {

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

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

  427.                 p += 3;

  428.             }

  429.         }

  430.     }

  431. }

  432. 

  433. static int request_frame(AVFilterLink *outlink)

  434. {

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

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

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

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

  439.     picref->pos = -1;

  440. 

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

  442.     evolve(outlink->src);

  443. #ifdef DEBUG

  444.     show_life_grid(outlink->src);

  445. #endif

  446. 

  447.     ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0));

  448.     ff_draw_slice(outlink, 0, life->h, 1);

  449.     ff_end_frame(outlink);

  450.     avfilter_unref_buffer(picref);

  451. 

  452.     return 0;

  453. }

  454. 

  455. static int query_formats(AVFilterContext *ctx)

  456. {

  457.     LifeContext *life = ctx->priv;

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

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

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

  461.         pix_fmts[0] = PIX_FMT_RGB24;

  462.         life->draw = fill_picture_rgb;

  463.     } else {

  464.         pix_fmts[0] = PIX_FMT_MONOBLACK;

  465.         life->draw = fill_picture_monoblack;

  466.     }

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

  468.     return 0;

  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. 

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

  480.         { .name = NULL}

  481.     },

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

  483.         { .name            = "default",

  484.           .type            = AVMEDIA_TYPE_VIDEO,

  485.           .request_frame   = request_frame,

  486.           .config_props    = config_props },

  487.         { .name = NULL}

  488.     },

  489. };