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00028 #include "libavutil/file.h"
00029 #include "libavutil/intreadwrite.h"
00030 #include "libavutil/lfg.h"
00031 #include "libavutil/opt.h"
00032 #include "libavutil/parseutils.h"
00033 #include "libavutil/random_seed.h"
00034 #include "avfilter.h"
00035
00036 typedef struct {
00037 const AVClass *class;
00038 int w, h;
00039 char *filename;
00040 char *rule_str;
00041 uint8_t *file_buf;
00042 size_t file_bufsize;
00043
00053 uint8_t *buf[2];
00054
00055 uint8_t buf_idx;
00056 uint16_t stay_rule;
00057 uint16_t born_rule;
00058 uint64_t pts;
00059 AVRational time_base;
00060 char *size;
00061 char *rate;
00062 double random_fill_ratio;
00063 uint32_t random_seed;
00064 int stitch;
00065 int mold;
00066 char *life_color_str;
00067 char *death_color_str;
00068 char *mold_color_str;
00069 uint8_t life_color[4];
00070 uint8_t death_color[4];
00071 uint8_t mold_color[4];
00072 AVLFG lfg;
00073 void (*draw)(AVFilterContext*, AVFilterBufferRef*);
00074 } LifeContext;
00075
00076 #define ALIVE_CELL 0xFF
00077 #define OFFSET(x) offsetof(LifeContext, x)
00078
00079 static const AVOption life_options[] = {
00080 { "filename", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
00081 { "f", "set source file", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
00082 { "size", "set video size", OFFSET(size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
00083 { "s", "set video size", OFFSET(size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
00084 { "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },
00085 { "r", "set video rate", OFFSET(rate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },
00086 { "rule", "set rule", OFFSET(rule_str), AV_OPT_TYPE_STRING, {.str = "B3/S23"}, CHAR_MIN, CHAR_MAX },
00087 { "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 },
00088 { "ratio", "set fill ratio for filling initial grid randomly", OFFSET(random_fill_ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1/M_PHI}, 0, 1 },
00089 { "random_seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX },
00090 { "seed", "set the seed for filling the initial grid randomly", OFFSET(random_seed), AV_OPT_TYPE_INT, {.dbl=-1}, -1, UINT32_MAX },
00091 { "stitch", "stitch boundaries", OFFSET(stitch), AV_OPT_TYPE_INT, {.dbl=1}, 0, 1 },
00092 { "mold", "set mold speed for dead cells", OFFSET(mold), AV_OPT_TYPE_INT, {.dbl=0}, 0, 0xFF },
00093 { "life_color", "set life color", OFFSET( life_color_str), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },
00094 { "death_color", "set death color", OFFSET(death_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
00095 { "mold_color", "set mold color", OFFSET( mold_color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
00096 { NULL },
00097 };
00098
00099 static const char *life_get_name(void *ctx)
00100 {
00101 return "life";
00102 }
00103
00104 static const AVClass life_class = {
00105 "LifeContext",
00106 life_get_name,
00107 life_options
00108 };
00109
00110 static int parse_rule(uint16_t *born_rule, uint16_t *stay_rule,
00111 const char *rule_str, void *log_ctx)
00112 {
00113 char *tail;
00114 const char *p = rule_str;
00115 *born_rule = 0;
00116 *stay_rule = 0;
00117
00118 if (strchr("bBsS", *p)) {
00119
00120
00121 do {
00122 uint16_t *rule = (*p == 'b' || *p == 'B') ? born_rule : stay_rule;
00123 p++;
00124 while (*p >= '0' && *p <= '8') {
00125 *rule += 1<<(*p - '0');
00126 p++;
00127 }
00128 if (*p != '/')
00129 break;
00130 p++;
00131 } while (strchr("bBsS", *p));
00132
00133 if (*p)
00134 goto error;
00135 } else {
00136
00137
00138 long int rule = strtol(rule_str, &tail, 10);
00139 if (*tail)
00140 goto error;
00141 *born_rule = ((1<<9)-1) & rule;
00142 *stay_rule = rule >> 9;
00143 }
00144
00145 return 0;
00146
00147 error:
00148 av_log(log_ctx, AV_LOG_ERROR, "Invalid rule code '%s' provided\n", rule_str);
00149 return AVERROR(EINVAL);
00150 }
00151
00152 #ifdef DEBUG
00153 static void show_life_grid(AVFilterContext *ctx)
00154 {
00155 LifeContext *life = ctx->priv;
00156 int i, j;
00157
00158 char *line = av_malloc(life->w + 1);
00159 if (!line)
00160 return;
00161 for (i = 0; i < life->h; i++) {
00162 for (j = 0; j < life->w; j++)
00163 line[j] = life->buf[life->buf_idx][i*life->w + j] == ALIVE_CELL ? '@' : ' ';
00164 line[j] = 0;
00165 av_log(ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
00166 }
00167 av_free(line);
00168 }
00169 #endif
00170
00171 static int init_pattern_from_file(AVFilterContext *ctx)
00172 {
00173 LifeContext *life = ctx->priv;
00174 char *p;
00175 int ret, i, i0, j, h = 0, w, max_w = 0;
00176
00177 if ((ret = av_file_map(life->filename, &life->file_buf, &life->file_bufsize,
00178 0, ctx)) < 0)
00179 return ret;
00180
00181
00182 w = 0;
00183 for (i = 0; i < life->file_bufsize; i++) {
00184 if (life->file_buf[i] == '\n') {
00185 h++; max_w = FFMAX(w, max_w); w = 0;
00186 } else {
00187 w++;
00188 }
00189 }
00190 av_log(ctx, AV_LOG_DEBUG, "h:%d max_w:%d\n", h, max_w);
00191
00192 if (life->size) {
00193 if (max_w > life->w || h > life->h) {
00194 av_log(ctx, AV_LOG_ERROR,
00195 "The specified size is %dx%d which cannot contain the provided file size of %dx%d\n",
00196 life->w, life->h, max_w, h);
00197 return AVERROR(EINVAL);
00198 }
00199 } else {
00200
00201 life->w = max_w;
00202 life->h = h;
00203 }
00204
00205 if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) ||
00206 !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {
00207 av_free(life->buf[0]);
00208 av_free(life->buf[1]);
00209 return AVERROR(ENOMEM);
00210 }
00211
00212
00213 p = life->file_buf;
00214 for (i0 = 0, i = (life->h - h)/2; i0 < h; i0++, i++) {
00215 for (j = (life->w - max_w)/2;; j++) {
00216 av_log(ctx, AV_LOG_DEBUG, "%d:%d %c\n", i, j, *p == '\n' ? 'N' : *p);
00217 if (*p == '\n') {
00218 p++; break;
00219 } else
00220 life->buf[0][i*life->w + j] = isgraph(*(p++)) ? ALIVE_CELL : 0;
00221 }
00222 }
00223 life->buf_idx = 0;
00224
00225 return 0;
00226 }
00227
00228 static int init(AVFilterContext *ctx, const char *args, void *opaque)
00229 {
00230 LifeContext *life = ctx->priv;
00231 AVRational frame_rate;
00232 int ret;
00233
00234 life->class = &life_class;
00235 av_opt_set_defaults(life);
00236
00237 if ((ret = av_set_options_string(life, args, "=", ":")) < 0) {
00238 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
00239 return ret;
00240 }
00241
00242 if ((ret = av_parse_video_rate(&frame_rate, life->rate)) < 0) {
00243 av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", life->rate);
00244 return AVERROR(EINVAL);
00245 }
00246
00247 if (!life->size && !life->filename)
00248 av_opt_set(life, "size", "320x240", 0);
00249
00250 if (life->size &&
00251 (ret = av_parse_video_size(&life->w, &life->h, life->size)) < 0) {
00252 av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", life->size);
00253 return ret;
00254 }
00255
00256 if ((ret = parse_rule(&life->born_rule, &life->stay_rule, life->rule_str, ctx)) < 0)
00257 return ret;
00258
00259 #define PARSE_COLOR(name) do { \
00260 if ((ret = av_parse_color(life->name ## _color, life->name ## _color_str, -1, ctx))) { \
00261 av_log(ctx, AV_LOG_ERROR, "Invalid " #name " color '%s'\n", \
00262 life->name ## _color_str); \
00263 return ret; \
00264 } \
00265 } while (0)
00266
00267 PARSE_COLOR(life);
00268 PARSE_COLOR(death);
00269 PARSE_COLOR(mold);
00270
00271 if (!life->mold && memcmp(life->mold_color, "\x00\x00\x00", 3))
00272 av_log(ctx, AV_LOG_WARNING,
00273 "Mold color is set while mold isn't, ignoring the color.\n");
00274
00275 life->time_base.num = frame_rate.den;
00276 life->time_base.den = frame_rate.num;
00277
00278 if (!life->filename) {
00279
00280 int i;
00281
00282 if (!(life->buf[0] = av_mallocz(sizeof(char) * life->h * life->w)) ||
00283 !(life->buf[1] = av_mallocz(sizeof(char) * life->h * life->w))) {
00284 av_free(life->buf[0]);
00285 av_free(life->buf[1]);
00286 return AVERROR(ENOMEM);
00287 }
00288 if (life->random_seed == -1)
00289 life->random_seed = av_get_random_seed();
00290
00291 av_lfg_init(&life->lfg, life->random_seed);
00292
00293 for (i = 0; i < life->w * life->h; i++) {
00294 double r = (double)av_lfg_get(&life->lfg) / UINT32_MAX;
00295 if (r <= life->random_fill_ratio)
00296 life->buf[0][i] = ALIVE_CELL;
00297 }
00298 life->buf_idx = 0;
00299 } else {
00300 if ((ret = init_pattern_from_file(ctx)) < 0)
00301 return ret;
00302 }
00303
00304 av_log(ctx, AV_LOG_INFO,
00305 "s:%dx%d r:%d/%d rule:%s stay_rule:%d born_rule:%d stitch:%d seed:%u\n",
00306 life->w, life->h, frame_rate.num, frame_rate.den,
00307 life->rule_str, life->stay_rule, life->born_rule, life->stitch,
00308 life->random_seed);
00309 return 0;
00310 }
00311
00312 static av_cold void uninit(AVFilterContext *ctx)
00313 {
00314 LifeContext *life = ctx->priv;
00315
00316 av_file_unmap(life->file_buf, life->file_bufsize);
00317 av_freep(&life->rule_str);
00318 av_freep(&life->buf[0]);
00319 av_freep(&life->buf[1]);
00320 }
00321
00322 static int config_props(AVFilterLink *outlink)
00323 {
00324 LifeContext *life = outlink->src->priv;
00325
00326 outlink->w = life->w;
00327 outlink->h = life->h;
00328 outlink->time_base = life->time_base;
00329
00330 return 0;
00331 }
00332
00333 static void evolve(AVFilterContext *ctx)
00334 {
00335 LifeContext *life = ctx->priv;
00336 int i, j;
00337 uint8_t *oldbuf = life->buf[ life->buf_idx];
00338 uint8_t *newbuf = life->buf[!life->buf_idx];
00339
00340 enum { NW, N, NE, W, E, SW, S, SE };
00341
00342
00343 for (i = 0; i < life->h; i++) {
00344 for (j = 0; j < life->w; j++) {
00345 int pos[8][2], n, alive, cell;
00346 if (life->stitch) {
00347 pos[NW][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NW][1] = (j-1) < 0 ? life->w-1 : j-1;
00348 pos[N ][0] = (i-1) < 0 ? life->h-1 : i-1; pos[N ][1] = j ;
00349 pos[NE][0] = (i-1) < 0 ? life->h-1 : i-1; pos[NE][1] = (j+1) == life->w ? 0 : j+1;
00350 pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? life->w-1 : j-1;
00351 pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? 0 : j+1;
00352 pos[SW][0] = (i+1) == life->h ? 0 : i+1; pos[SW][1] = (j-1) < 0 ? life->w-1 : j-1;
00353 pos[S ][0] = (i+1) == life->h ? 0 : i+1; pos[S ][1] = j ;
00354 pos[SE][0] = (i+1) == life->h ? 0 : i+1; pos[SE][1] = (j+1) == life->w ? 0 : j+1;
00355 } else {
00356 pos[NW][0] = (i-1) < 0 ? -1 : i-1; pos[NW][1] = (j-1) < 0 ? -1 : j-1;
00357 pos[N ][0] = (i-1) < 0 ? -1 : i-1; pos[N ][1] = j ;
00358 pos[NE][0] = (i-1) < 0 ? -1 : i-1; pos[NE][1] = (j+1) == life->w ? -1 : j+1;
00359 pos[W ][0] = i ; pos[W ][1] = (j-1) < 0 ? -1 : j-1;
00360 pos[E ][0] = i ; pos[E ][1] = (j+1) == life->w ? -1 : j+1;
00361 pos[SW][0] = (i+1) == life->h ? -1 : i+1; pos[SW][1] = (j-1) < 0 ? -1 : j-1;
00362 pos[S ][0] = (i+1) == life->h ? -1 : i+1; pos[S ][1] = j ;
00363 pos[SE][0] = (i+1) == life->h ? -1 : i+1; pos[SE][1] = (j+1) == life->w ? -1 : j+1;
00364 }
00365
00366
00367 n = (pos[NW][0] == -1 || pos[NW][1] == -1 ? 0 : oldbuf[pos[NW][0]*life->w + pos[NW][1]] == ALIVE_CELL) +
00368 (pos[N ][0] == -1 || pos[N ][1] == -1 ? 0 : oldbuf[pos[N ][0]*life->w + pos[N ][1]] == ALIVE_CELL) +
00369 (pos[NE][0] == -1 || pos[NE][1] == -1 ? 0 : oldbuf[pos[NE][0]*life->w + pos[NE][1]] == ALIVE_CELL) +
00370 (pos[W ][0] == -1 || pos[W ][1] == -1 ? 0 : oldbuf[pos[W ][0]*life->w + pos[W ][1]] == ALIVE_CELL) +
00371 (pos[E ][0] == -1 || pos[E ][1] == -1 ? 0 : oldbuf[pos[E ][0]*life->w + pos[E ][1]] == ALIVE_CELL) +
00372 (pos[SW][0] == -1 || pos[SW][1] == -1 ? 0 : oldbuf[pos[SW][0]*life->w + pos[SW][1]] == ALIVE_CELL) +
00373 (pos[S ][0] == -1 || pos[S ][1] == -1 ? 0 : oldbuf[pos[S ][0]*life->w + pos[S ][1]] == ALIVE_CELL) +
00374 (pos[SE][0] == -1 || pos[SE][1] == -1 ? 0 : oldbuf[pos[SE][0]*life->w + pos[SE][1]] == ALIVE_CELL);
00375 cell = oldbuf[i*life->w + j];
00376 alive = 1<<n & (cell == ALIVE_CELL ? life->stay_rule : life->born_rule);
00377 if (alive) *newbuf = ALIVE_CELL;
00378 else if (cell) *newbuf = cell - 1;
00379 else *newbuf = 0;
00380 av_dlog(ctx, "i:%d j:%d live_neighbors:%d cell:%d -> cell:%d\n", i, j, n, cell, *newbuf);
00381 newbuf++;
00382 }
00383 }
00384
00385 life->buf_idx = !life->buf_idx;
00386 }
00387
00388 static void fill_picture_monoblack(AVFilterContext *ctx, AVFilterBufferRef *picref)
00389 {
00390 LifeContext *life = ctx->priv;
00391 uint8_t *buf = life->buf[life->buf_idx];
00392 int i, j, k;
00393
00394
00395 for (i = 0; i < life->h; i++) {
00396 uint8_t byte = 0;
00397 uint8_t *p = picref->data[0] + i * picref->linesize[0];
00398 for (k = 0, j = 0; j < life->w; j++) {
00399 byte |= (buf[i*life->w+j] == ALIVE_CELL)<<(7-k++);
00400 if (k==8 || j == life->w-1) {
00401 k = 0;
00402 *p++ = byte;
00403 byte = 0;
00404 }
00405 }
00406 }
00407 }
00408
00409
00410
00411 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
00412
00413 static void fill_picture_rgb(AVFilterContext *ctx, AVFilterBufferRef *picref)
00414 {
00415 LifeContext *life = ctx->priv;
00416 uint8_t *buf = life->buf[life->buf_idx];
00417 int i, j;
00418
00419
00420 for (i = 0; i < life->h; i++) {
00421 uint8_t *p = picref->data[0] + i * picref->linesize[0];
00422 for (j = 0; j < life->w; j++) {
00423 uint8_t v = buf[i*life->w + j];
00424 if (life->mold && v != ALIVE_CELL) {
00425 const uint8_t *c1 = life-> mold_color;
00426 const uint8_t *c2 = life->death_color;
00427 int death_age = FFMIN((0xff - v) * life->mold, 0xff);
00428 *p++ = FAST_DIV255((c2[0] << 8) + ((int)c1[0] - (int)c2[0]) * death_age);
00429 *p++ = FAST_DIV255((c2[1] << 8) + ((int)c1[1] - (int)c2[1]) * death_age);
00430 *p++ = FAST_DIV255((c2[2] << 8) + ((int)c1[2] - (int)c2[2]) * death_age);
00431 } else {
00432 const uint8_t *c = v == ALIVE_CELL ? life->life_color : life->death_color;
00433 AV_WB24(p, c[0]<<16 | c[1]<<8 | c[2]);
00434 p += 3;
00435 }
00436 }
00437 }
00438 }
00439
00440 static int request_frame(AVFilterLink *outlink)
00441 {
00442 LifeContext *life = outlink->src->priv;
00443 AVFilterBufferRef *picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, life->w, life->h);
00444 picref->video->sample_aspect_ratio = (AVRational) {1, 1};
00445 picref->pts = life->pts++;
00446 picref->pos = -1;
00447
00448 life->draw(outlink->src, picref);
00449 evolve(outlink->src);
00450 #ifdef DEBUG
00451 show_life_grid(outlink->src);
00452 #endif
00453
00454 avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
00455 avfilter_draw_slice(outlink, 0, life->h, 1);
00456 avfilter_end_frame(outlink);
00457 avfilter_unref_buffer(picref);
00458
00459 return 0;
00460 }
00461
00462 static int query_formats(AVFilterContext *ctx)
00463 {
00464 LifeContext *life = ctx->priv;
00465 enum PixelFormat pix_fmts[] = { PIX_FMT_NONE, PIX_FMT_NONE };
00466 if (life->mold || memcmp(life-> life_color, "\xff\xff\xff", 3)
00467 || memcmp(life->death_color, "\x00\x00\x00", 3)) {
00468 pix_fmts[0] = PIX_FMT_RGB24;
00469 life->draw = fill_picture_rgb;
00470 } else {
00471 pix_fmts[0] = PIX_FMT_MONOBLACK;
00472 life->draw = fill_picture_monoblack;
00473 }
00474 avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00475 return 0;
00476 }
00477
00478 AVFilter avfilter_vsrc_life = {
00479 .name = "life",
00480 .description = NULL_IF_CONFIG_SMALL("Create life."),
00481 .priv_size = sizeof(LifeContext),
00482 .init = init,
00483 .uninit = uninit,
00484 .query_formats = query_formats,
00485
00486 .inputs = (const AVFilterPad[]) {
00487 { .name = NULL}
00488 },
00489 .outputs = (const AVFilterPad[]) {
00490 { .name = "default",
00491 .type = AVMEDIA_TYPE_VIDEO,
00492 .request_frame = request_frame,
00493 .config_props = config_props },
00494 { .name = NULL}
00495 },
00496 };
