vhook/fish.c

   1 /*
   2  * Fish Detector Hook
   3  * Copyright (c) 2002 Philip Gladstone
   4  *
   5  * This file implements a fish detector. It is used to see when a
   6  * goldfish passes in front of the camera. It does this by counting
   7  * the number of input pixels that fall within a particular HSV
   8  * range.
   9  *
  10  * It takes a multitude of arguments:
  11  *
  12  * -h <num>-<num>    the range of H values that are fish
  13  * -s <num>-<num>    the range of S values that are fish
  14  * -v <num>-<num>    the range of V values that are fish
  15  * -z                zap all non-fish values to black
  16  * -l <num>          limit the number of saved files to <num>
  17  * -i <num>          only check frames every <num> seconds
  18  * -t <num>          the threshold for the amount of fish pixels (range 0-1)
  19  * -d                turn debugging on
  20  * -D <directory>    where to put the fish images
  21  *
  22  * This library is free software; you can redistribute it and/or
  23  * modify it under the terms of the GNU Lesser General Public
  24  * License as published by the Free Software Foundation; either
  25  * version 2 of the License, or (at your option) any later version.
  26  *
  27  * This library is distributed in the hope that it will be useful,
  28  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  30  * Lesser General Public License for more details.
  31  *
  32  * You should have received a copy of the GNU Lesser General Public
  33  * License along with this library; if not, write to the Free Software
  34  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  35  */
  36 #include <stdlib.h>
  37 #include <fcntl.h>
  38 #include <unistd.h>
  39 #include <stdarg.h>
  40 #include <string.h>
  41 #include <time.h>
  42 #include <stdio.h>
  43 #include <dirent.h>
  44
  45 #include "framehook.h"
  46 #include "dsputil.h"
  47
  48 #define SCALE_BITS 10
  49
  50 #define C_Y  (76309 >> (16 - SCALE_BITS))
  51 #define C_RV (117504 >> (16 - SCALE_BITS))
  52 #define C_BU (138453 >> (16 - SCALE_BITS))
  53 #define C_GU (13954 >> (16 - SCALE_BITS))
  54 #define C_GV (34903 >> (16 - SCALE_BITS))
  55
  56
  57 typedef struct {
  58     int h;  /* 0 .. 360 */
  59     int s;  /* 0 .. 255 */
  60     int v;  /* 0 .. 255 */
  61 } HSV;
  62
  63 typedef struct {
  64     int zapping;
  65     int threshold;
  66     HSV dark, bright;
  67     char *dir;
  68     int file_limit;
  69     int debug;
  70     int min_interval;
  71     int64_t next_pts;
  72     int inset;
  73     int min_width;
  74 } ContextInfo;
  75
  76 static void dorange(const char *s, int *first, int *second, int maxval)
  77 {
  78     sscanf(s, "%d-%d", first, second);
  79     if (*first > maxval)
  80         *first = maxval;
  81     if (*second > maxval)
  82         *second = maxval;
  83 }
  84
  85 void Release(void *ctx)
  86 {
  87     if (ctx)
  88         av_free(ctx);
  89 }
  90
  91 int Configure(void **ctxp, int argc, char *argv[])
  92 {
  93     ContextInfo *ci;
  94     int c;
  95
  96     *ctxp = av_mallocz(sizeof(ContextInfo));
  97     ci = (ContextInfo *) *ctxp;
  98
  99     optind = 0;
 100
 101     ci->dir = "/tmp";
 102     ci->threshold = 100;
 103     ci->file_limit = 100;
 104     ci->min_interval = 1000000;
 105     ci->inset = 10;     /* Percent */
 106
 107     while ((c = getopt(argc, argv, "w:i:dh:s:v:zl:t:D:")) > 0) {
 108         switch (c) {
 109             case 'h':
 110                 dorange(optarg, &ci->dark.h, &ci->bright.h, 360);
 111                 break;
 112             case 's':
 113                 dorange(optarg, &ci->dark.s, &ci->bright.s, 255);
 114                 break;
 115             case 'v':
 116                 dorange(optarg, &ci->dark.v, &ci->bright.v, 255);
 117                 break;
 118             case 'z':
 119                 ci->zapping = 1;
 120                 break;
 121             case 'l':
 122                 ci->file_limit = atoi(optarg);
 123                 break;
 124             case 'i':
 125                 ci->min_interval = 1000000 * atof(optarg);
 126                 break;
 127             case 't':
 128                 ci->threshold = atof(optarg) * 1000;
 129                 if (ci->threshold > 1000 || ci->threshold < 0) {
 130                     fprintf(stderr, "Invalid threshold value '%s' (range is 0-1)\n", optarg);
 131                     return -1;
 132                 }
 133                 break;
 134             case 'w':
 135                 ci->min_width = atoi(optarg);
 136                 break;
 137             case 'd':
 138                 ci->debug++;
 139                 break;
 140             case 'D':
 141                 ci->dir = av_strdup(optarg);
 142                 break;
 143             default:
 144                 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
 145                 return -1;
 146         }
 147     }
 148
 149     fprintf(stderr, "Fish detector configured:\n");
 150     fprintf(stderr, "    HSV range: %d,%d,%d - %d,%d,%d\n",
 151                         ci->dark.h,
 152                         ci->dark.s,
 153                         ci->dark.v,
 154                         ci->bright.h,
 155                         ci->bright.s,
 156                         ci->bright.v);
 157
 158     return 0;
 159 }
 160
 161 static void get_hsv(HSV *hsv, int r, int g, int b)
 162 {
 163     int i, v, x, f;
 164
 165     x = (r < g) ? r : g;
 166     if (b < x)
 167         x = b;
 168     v = (r > g) ? r : g;
 169     if (b > v)
 170         v = b;
 171
 172     if (v == x) {
 173         hsv->h = 0;
 174         hsv->s = 0;
 175         hsv->v = v;
 176         return;
 177     }
 178
 179     if (r == v) {
 180         f = g - b;
 181         i = 0;
 182     } else if (g == v) {
 183         f = b - r;
 184         i = 2 * 60;
 185     } else {
 186         f = r - g;
 187         i = 4 * 60;
 188     }
 189
 190     hsv->h = i + (60 * f) / (v - x);
 191     if (hsv->h < 0)
 192         hsv->h += 360;
 193
 194     hsv->s = (255 * (v - x)) / v;
 195     hsv->v = v;
 196
 197     return;
 198 }
 199
 200 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 201 {
 202     ContextInfo *ci = (ContextInfo *) ctx;
 203     uint8_t *cm = cropTbl + MAX_NEG_CROP;
 204     int rowsize = picture->linesize[0];
 205
 206 #if 0
 207     printf("pix_fmt = %d, width = %d, pts = %lld, ci->next_pts = %lld\n",
 208         pix_fmt, width, pts, ci->next_pts);
 209 #endif
 210
 211     if (pts < ci->next_pts)
 212         return;
 213
 214     if (width < ci->min_width)
 215         return;
 216
 217     ci->next_pts = pts + 1000000;
 218
 219     if (pix_fmt == PIX_FMT_YUV420P) {
 220         uint8_t *y, *u, *v;
 221         int width2 = width >> 1;
 222         int inrange = 0;
 223         int pixcnt;
 224         int h;
 225         int h_start, h_end;
 226         int w_start, w_end;
 227
 228         h_end = 2 * ((ci->inset * height) / 200);
 229         h_start = height - h_end;
 230
 231         w_end = (ci->inset * width2) / 100;
 232         w_start = width2 - w_end;
 233
 234         pixcnt = ((h_start - h_end) >> 1) * (w_start - w_end);
 235
 236         y = picture->data[0] + h_end * picture->linesize[0] + w_end * 2;
 237         u = picture->data[1] + h_end * picture->linesize[1] + w_end;
 238         v = picture->data[2] + h_end * picture->linesize[2] + w_end;
 239
 240         for (h = h_start; h > h_end; h -= 2) {
 241             int w;
 242
 243             for (w = w_start; w > w_end; w--) {
 244                 int r,g,b;
 245                 int Y, U, V;
 246                 HSV hsv;
 247
 248                 U = u[0] - 128;
 249                 V = v[0] - 128;
 250
 251                 Y = (y[0] - 16) * C_Y;
 252
 253                 r = cm[(Y + C_RV * V + (1 << (SCALE_BITS - 1))) >> SCALE_BITS];
 254                 g = cm[(Y + - C_GU * U - C_GV * V + (1 << (SCALE_BITS - 1))) >> SCALE_BITS];
 255                 b = cm[(Y + C_BU * U + (1 << (SCALE_BITS - 1))) >> SCALE_BITS];
 256
 257                 get_hsv(&hsv, r, g, b);
 258
 259                 if (ci->debug > 1)
 260                     fprintf(stderr, "(%d,%d,%d) -> (%d,%d,%d)\n",
 261                         r,g,b,hsv.h,hsv.s,hsv.v);
 262
 263
 264                 if (hsv.h >= ci->dark.h && hsv.h <= ci->bright.h &&
 265                     hsv.s >= ci->dark.s && hsv.s <= ci->bright.s &&
 266                     hsv.v >= ci->dark.v && hsv.v <= ci->bright.v) {
 267                     inrange++;
 268                 } else if (ci->zapping) {
 269                     y[0] = y[1] = y[rowsize] = y[rowsize + 1] = 0;
 270                 }
 271
 272                 y+= 2;
 273                 u++;
 274                 v++;
 275             }
 276
 277             y += picture->linesize[0] * 2 - (w_start - w_end) * 2;
 278             u += picture->linesize[1] - (w_start - w_end);
 279             v += picture->linesize[2] - (w_start - w_end);
 280         }
 281
 282         if (ci->debug)
 283             fprintf(stderr, "Fish: Inrange=%d of %d = %d threshold\n", inrange, pixcnt, 1000 * inrange / pixcnt);
 284
 285         if (inrange * 1000 / pixcnt >= ci->threshold) {
 286             /* Save to file */
 287             int size;
 288             char *buf;
 289             AVPicture picture1;
 290             static int frame_counter;
 291             static int foundfile;
 292
 293             if ((frame_counter++ % 20) == 0) {
 294                 /* Check how many files we have */
 295                 DIR *d;
 296
 297                 foundfile = 0;
 298
 299                 d = opendir(ci->dir);
 300                 if (d) {
 301                     struct dirent *dent;
 302
 303                     while ((dent = readdir(d))) {
 304                         if (strncmp("fishimg", dent->d_name, 7) == 0) {
 305                             if (strcmp(".ppm", dent->d_name + strlen(dent->d_name) - 4) == 0) {
 306                                 foundfile++;
 307                             }
 308                         }
 309                     }
 310                     closedir(d);
 311                 }
 312             }
 313
 314             if (foundfile < ci->file_limit) {
 315                 size = avpicture_get_size(PIX_FMT_RGB24, width, height);
 316                 buf = av_malloc(size);
 317
 318                 avpicture_fill(&picture1, buf, PIX_FMT_RGB24, width, height);
 319                 if (img_convert(&picture1, PIX_FMT_RGB24,
 320                                 picture, pix_fmt, width, height) >= 0) {
 321                     /* Write out the PPM file */
 322
 323                     FILE *f;
 324                     char fname[256];
 325
 326                     sprintf(fname, "%s/fishimg%ld_%lld.ppm", ci->dir, time(0), pts);
 327                     f = fopen(fname, "w");
 328                     if (f) {
 329                         fprintf(f, "P6 %d %d 255\n", width, height);
 330                         fwrite(buf, width * height * 3, 1, f);
 331                         fclose(f);
 332                     }
 333                 }
 334
 335                 av_free(buf);
 336                 ci->next_pts = pts + ci->min_interval;
 337             }
 338         }
 339     }
 340 }
 341