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 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 = 1000;
 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                 break;
 130             case 'w':
 131                 ci->min_width = atoi(optarg);
 132                 break;
 133             case 'd':
 134                 ci->debug++;
 135                 break;
 136             case 'D':
 137                 ci->dir = av_strdup(optarg);
 138                 break;
 139             default:
 140                 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
 141                 return -1;
 142         }
 143     }
 144
 145     fprintf(stderr, "Fish detector configured:\n");
 146     fprintf(stderr, "    HSV range: %d,%d,%d - %d,%d,%d\n",
 147                         ci->dark.h,
 148                         ci->dark.s,
 149                         ci->dark.v,
 150                         ci->bright.h,
 151                         ci->bright.s,
 152                         ci->bright.v);
 153
 154     return 0;
 155 }
 156
 157 static void get_hsv(HSV *hsv, int r, int g, int b)
 158 {
 159     int i, v, x, f;
 160
 161     x = (r < g) ? r : g;
 162     if (b < x)
 163         x = b;
 164     v = (r > g) ? r : g;
 165     if (b > v)
 166         v = b;
 167
 168     if (v == x) {
 169         hsv->h = 0;
 170         hsv->s = 0;
 171         hsv->v = v;
 172         return;
 173     }
 174
 175     if (r == v) {
 176         f = g - b;
 177         i = 0;
 178     } else if (g == v) {
 179         f = b - r;
 180         i = 2 * 60;
 181     } else {
 182         f = r - g;
 183         i = 4 * 60;
 184     }
 185
 186     hsv->h = i + (60 * f) / (v - x);
 187     if (hsv->h < 0)
 188         hsv->h += 360;
 189
 190     hsv->s = (255 * (v - x)) / v;
 191     hsv->v = v;
 192
 193     return;
 194 }
 195
 196 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, INT64 pts)
 197 {
 198     ContextInfo *ci = (ContextInfo *) ctx;
 199     UINT8 *cm = cropTbl + MAX_NEG_CROP;
 200     int rowsize = picture->linesize[0];
 201
 202     if (pts < ci->next_pts)
 203         return;
 204
 205     if (width < ci->min_width)
 206         return;
 207
 208     ci->next_pts = pts + 1000000;
 209
 210     if (pix_fmt == PIX_FMT_YUV420P) {
 211         UINT8 *y, *u, *v;
 212         int width2 = width >> 1;
 213         int inrange = 0;
 214         int pixcnt;
 215         int h;
 216         int h_start, h_end;
 217         int w_start, w_end;
 218
 219         h_end = 2 * ((ci->inset * height) / 200);
 220         h_start = height - h_end;
 221
 222         w_end = (ci->inset * width2) / 100;
 223         w_start = width2 - w_end;
 224
 225         pixcnt = ((h_start - h_end) >> 1) * (w_start - w_end);
 226
 227         y = picture->data[0];
 228         u = picture->data[1];
 229         v = picture->data[2];
 230
 231         for (h = h_start; h > h_end; h -= 2) {
 232             int w;
 233
 234             for (w = w_start; w > w_end; w--) {
 235                 int r,g,b;
 236                 int Y, U, V;
 237                 HSV hsv;
 238
 239                 U = u[0] - 128;
 240                 V = v[0] - 128;
 241
 242                 Y = (y[0] - 16) * C_Y;
 243
 244                 r = cm[(Y + C_RV * V + (1 << (SCALE_BITS - 1))) >> SCALE_BITS];
 245                 g = cm[(Y + - C_GU * U - C_GV * V + (1 << (SCALE_BITS - 1))) >> SCALE_BITS];
 246                 b = cm[(Y + C_BU * U + (1 << (SCALE_BITS - 1))) >> SCALE_BITS];
 247
 248                 get_hsv(&hsv, r, g, b);
 249
 250                 if (ci->debug > 1)
 251                     fprintf(stderr, "(%d,%d,%d) -> (%d,%d,%d)\n",
 252                         r,g,b,hsv.h,hsv.s,hsv.v);
 253
 254
 255                 if (hsv.h >= ci->dark.h && hsv.h <= ci->bright.h &&
 256                     hsv.s >= ci->dark.s && hsv.s <= ci->bright.s &&
 257                     hsv.v >= ci->dark.v && hsv.v <= ci->bright.v) {
 258                     inrange++;
 259                 } else if (ci->zapping) {
 260                     y[0] = y[1] = y[rowsize] = y[rowsize + 1] = 0;
 261                 }
 262
 263                 y+= 2;
 264                 u++;
 265                 v++;
 266             }
 267
 268             y += picture->linesize[0] * 2 - width;
 269             u += picture->linesize[1] - width2;
 270             v += picture->linesize[2] - width2;
 271         }
 272
 273         if (inrange * 1000 / pixcnt >= ci->threshold) {
 274             /* Save to file */
 275             int size;
 276             char *buf;
 277             AVPicture picture1;
 278             static int frame_counter;
 279             static int foundfile;
 280
 281             if (ci->debug)
 282                 fprintf(stderr, "Fish: Inrange=%d of %d = %d threshold\n", inrange, pixcnt, 1000 * inrange / pixcnt);
 283
 284             if ((frame_counter++ % 20) == 0) {
 285                 /* Check how many files we have */
 286                 DIR *d;
 287
 288                 foundfile = 0;
 289
 290                 d = opendir(ci->dir);
 291                 if (d) {
 292                     struct dirent *dent;
 293
 294                     while ((dent = readdir(d))) {
 295                         if (strncmp("fishimg", dent->d_name, 7) == 0) {
 296                             if (strcmp(".ppm", dent->d_name + strlen(dent->d_name) - 4) == 0) {
 297                                 foundfile++;
 298                             }
 299                         }
 300                     }
 301                     closedir(d);
 302                 }
 303             }
 304
 305             if (foundfile < ci->file_limit) {
 306                 size = avpicture_get_size(PIX_FMT_RGB24, width, height);
 307                 buf = av_malloc(size);
 308
 309                 avpicture_fill(&picture1, buf, PIX_FMT_RGB24, width, height);
 310                 if (img_convert(&picture1, PIX_FMT_RGB24,
 311                                 picture, pix_fmt, width, height) >= 0) {
 312                     /* Write out the PPM file */
 313
 314                     FILE *f;
 315                     char fname[256];
 316
 317                     sprintf(fname, "%s/fishimg%ld_%lld.ppm", ci->dir, time(0), pts);
 318                     f = fopen(fname, "w");
 319                     if (f) {
 320                         fprintf(f, "P6 %d %d 255\n", width, height);
 321                         fwrite(buf, width * height * 3, 1, f);
 322                         fclose(f);
 323                     }
 324                 }
 325
 326                 av_free(buf);
 327                 ci->next_pts = pts + ci->min_interval;
 328             }
 329         }
 330     }
 331 }
 332