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 file is part of FFmpeg.
  23  *
  24  * FFmpeg is free software; you can redistribute it and/or
  25  * modify it under the terms of the GNU Lesser General Public
  26  * License as published by the Free Software Foundation; either
  27  * version 2.1 of the License, or (at your option) any later version.
  28  *
  29  * FFmpeg is distributed in the hope that it will be useful,
  30  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  32  * Lesser General Public License for more details.
  33  *
  34  * You should have received a copy of the GNU Lesser General Public
  35  * License along with FFmpeg; if not, write to the Free Software
  36  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  37  */
  38 #include <stdlib.h>
  39 #include <fcntl.h>
  40 #include <unistd.h>
  41 #include <stdarg.h>
  42 #include <string.h>
  43 #include <time.h>
  44 #include <stdio.h>
  45 #include <dirent.h>
  46
  47 #include "libavformat/avformat.h"
  48 #include "libavformat/framehook.h"
  49 #include "libavcodec/dsputil.h"
  50 #include "libswscale/swscale.h"
  51
  52 static int sws_flags = SWS_BICUBIC;
  53
  54 #define SCALEBITS 10
  55 #define ONE_HALF  (1 << (SCALEBITS - 1))
  56 #define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
  57
  58 #define YUV_TO_RGB1_CCIR(cb1, cr1)\
  59 {\
  60     cb = (cb1) - 128;\
  61     cr = (cr1) - 128;\
  62     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
  63     g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
  64                     ONE_HALF;\
  65     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
  66 }
  67
  68 #define YUV_TO_RGB2_CCIR(r, g, b, y1)\
  69 {\
  70     yt = ((y1) - 16) * FIX(255.0/219.0);\
  71     r = cm[(yt + r_add) >> SCALEBITS];\
  72     g = cm[(yt + g_add) >> SCALEBITS];\
  73     b = cm[(yt + b_add) >> SCALEBITS];\
  74 }
  75
  76
  77
  78
  79 typedef struct {
  80     int h;  /* 0 .. 360 */
  81     int s;  /* 0 .. 255 */
  82     int v;  /* 0 .. 255 */
  83 } HSV;
  84
  85 typedef struct {
  86     int zapping;
  87     int threshold;
  88     HSV dark, bright;
  89     char *dir;
  90     int file_limit;
  91     int debug;
  92     int min_interval;
  93     int64_t next_pts;
  94     int inset;
  95     int min_width;
  96     struct SwsContext *toRGB_convert_ctx;
  97 } ContextInfo;
  98
  99 static void dorange(const char *s, int *first, int *second, int maxval)
 100 {
 101     sscanf(s, "%d-%d", first, second);
 102     if (*first > maxval)
 103         *first = maxval;
 104     if (*second > maxval)
 105         *second = maxval;
 106 }
 107
 108 void Release(void *ctx)
 109 {
 110     ContextInfo *ci;
 111     ci = (ContextInfo *) ctx;
 112
 113     if (ctx) {
 114         sws_freeContext(ci->toRGB_convert_ctx);
 115         av_free(ctx);
 116     }
 117 }
 118
 119 int Configure(void **ctxp, int argc, char *argv[])
 120 {
 121     ContextInfo *ci;
 122     int c;
 123
 124     *ctxp = av_mallocz(sizeof(ContextInfo));
 125     ci = (ContextInfo *) *ctxp;
 126
 127     optind = 1;
 128
 129     ci->dir = "/tmp";
 130     ci->threshold = 100;
 131     ci->file_limit = 100;
 132     ci->min_interval = 1000000;
 133     ci->inset = 10;     /* Percent */
 134
 135     while ((c = getopt(argc, argv, "w:i:dh:s:v:zl:t:D:")) > 0) {
 136         switch (c) {
 137             case 'h':
 138                 dorange(optarg, &ci->dark.h, &ci->bright.h, 360);
 139                 break;
 140             case 's':
 141                 dorange(optarg, &ci->dark.s, &ci->bright.s, 255);
 142                 break;
 143             case 'v':
 144                 dorange(optarg, &ci->dark.v, &ci->bright.v, 255);
 145                 break;
 146             case 'z':
 147                 ci->zapping = 1;
 148                 break;
 149             case 'l':
 150                 ci->file_limit = atoi(optarg);
 151                 break;
 152             case 'i':
 153                 ci->min_interval = 1000000 * atof(optarg);
 154                 break;
 155             case 't':
 156                 ci->threshold = atof(optarg) * 1000;
 157                 if (ci->threshold > 1000 || ci->threshold < 0) {
 158                     fprintf(stderr, "Invalid threshold value '%s' (range is 0-1)\n", optarg);
 159                     return -1;
 160                 }
 161                 break;
 162             case 'w':
 163                 ci->min_width = atoi(optarg);
 164                 break;
 165             case 'd':
 166                 ci->debug++;
 167                 break;
 168             case 'D':
 169                 ci->dir = av_strdup(optarg);
 170                 break;
 171             default:
 172                 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
 173                 return -1;
 174         }
 175     }
 176
 177     fprintf(stderr, "Fish detector configured:\n");
 178     fprintf(stderr, "    HSV range: %d,%d,%d - %d,%d,%d\n",
 179                         ci->dark.h,
 180                         ci->dark.s,
 181                         ci->dark.v,
 182                         ci->bright.h,
 183                         ci->bright.s,
 184                         ci->bright.v);
 185     fprintf(stderr, "    Threshold is %d%% pixels\n", ci->threshold / 10);
 186
 187
 188     return 0;
 189 }
 190
 191 static void get_hsv(HSV *hsv, int r, int g, int b)
 192 {
 193     int i, v, x, f;
 194
 195     x = (r < g) ? r : g;
 196     if (b < x)
 197         x = b;
 198     v = (r > g) ? r : g;
 199     if (b > v)
 200         v = b;
 201
 202     if (v == x) {
 203         hsv->h = 0;
 204         hsv->s = 0;
 205         hsv->v = v;
 206         return;
 207     }
 208
 209     if (r == v) {
 210         f = g - b;
 211         i = 0;
 212     } else if (g == v) {
 213         f = b - r;
 214         i = 2 * 60;
 215     } else {
 216         f = r - g;
 217         i = 4 * 60;
 218     }
 219
 220     hsv->h = i + (60 * f) / (v - x);
 221     if (hsv->h < 0)
 222         hsv->h += 360;
 223
 224     hsv->s = (255 * (v - x)) / v;
 225     hsv->v = v;
 226
 227     return;
 228 }
 229
 230 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 231 {
 232     ContextInfo *ci = (ContextInfo *) ctx;
 233     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
 234     int rowsize = picture->linesize[0];
 235
 236 #if 0
 237     printf("pix_fmt = %d, width = %d, pts = %lld, ci->next_pts = %lld\n",
 238         pix_fmt, width, pts, ci->next_pts);
 239 #endif
 240
 241     if (pts < ci->next_pts)
 242         return;
 243
 244     if (width < ci->min_width)
 245         return;
 246
 247     ci->next_pts = pts + 1000000;
 248
 249     if (pix_fmt == PIX_FMT_YUV420P) {
 250         uint8_t *y, *u, *v;
 251         int width2 = width >> 1;
 252         int inrange = 0;
 253         int pixcnt;
 254         int h;
 255         int h_start, h_end;
 256         int w_start, w_end;
 257
 258         h_end = 2 * ((ci->inset * height) / 200);
 259         h_start = height - h_end;
 260
 261         w_end = (ci->inset * width2) / 100;
 262         w_start = width2 - w_end;
 263
 264         pixcnt = ((h_start - h_end) >> 1) * (w_start - w_end);
 265
 266         y = picture->data[0] + h_end * picture->linesize[0] + w_end * 2;
 267         u = picture->data[1] + h_end * picture->linesize[1] / 2 + w_end;
 268         v = picture->data[2] + h_end * picture->linesize[2] / 2 + w_end;
 269
 270         for (h = h_start; h > h_end; h -= 2) {
 271             int w;
 272
 273             for (w = w_start; w > w_end; w--) {
 274                 unsigned int r,g,b;
 275                 HSV hsv;
 276                 int cb, cr, yt, r_add, g_add, b_add;
 277
 278                 YUV_TO_RGB1_CCIR(u[0], v[0]);
 279                 YUV_TO_RGB2_CCIR(r, g, b, y[0]);
 280
 281                 get_hsv(&hsv, r, g, b);
 282
 283                 if (ci->debug > 1)
 284                     fprintf(stderr, "(%d,%d,%d) -> (%d,%d,%d)\n",
 285                         r,g,b,hsv.h,hsv.s,hsv.v);
 286
 287
 288                 if (hsv.h >= ci->dark.h && hsv.h <= ci->bright.h &&
 289                     hsv.s >= ci->dark.s && hsv.s <= ci->bright.s &&
 290                     hsv.v >= ci->dark.v && hsv.v <= ci->bright.v) {
 291                     inrange++;
 292                 } else if (ci->zapping) {
 293                     y[0] = y[1] = y[rowsize] = y[rowsize + 1] = 16;
 294                     u[0] = 128;
 295                     v[0] = 128;
 296                 }
 297
 298                 y+= 2;
 299                 u++;
 300                 v++;
 301             }
 302
 303             y += picture->linesize[0] * 2 - (w_start - w_end) * 2;
 304             u += picture->linesize[1] - (w_start - w_end);
 305             v += picture->linesize[2] - (w_start - w_end);
 306         }
 307
 308         if (ci->debug)
 309             fprintf(stderr, "Fish: Inrange=%d of %d = %d threshold\n", inrange, pixcnt, 1000 * inrange / pixcnt);
 310
 311         if (inrange * 1000 / pixcnt >= ci->threshold) {
 312             /* Save to file */
 313             int size;
 314             char *buf;
 315             AVPicture picture1;
 316             static int frame_counter;
 317             static int foundfile;
 318
 319             if ((frame_counter++ % 20) == 0) {
 320                 /* Check how many files we have */
 321                 DIR *d;
 322
 323                 foundfile = 0;
 324
 325                 d = opendir(ci->dir);
 326                 if (d) {
 327                     struct dirent *dent;
 328
 329                     while ((dent = readdir(d))) {
 330                         if (strncmp("fishimg", dent->d_name, 7) == 0) {
 331                             if (strcmp(".ppm", dent->d_name + strlen(dent->d_name) - 4) == 0) {
 332                                 foundfile++;
 333                             }
 334                         }
 335                     }
 336                     closedir(d);
 337                 }
 338             }
 339
 340             if (foundfile < ci->file_limit) {
 341                 FILE *f;
 342                 char fname[256];
 343
 344                 size = avpicture_get_size(PIX_FMT_RGB24, width, height);
 345                 buf = av_malloc(size);
 346
 347                 avpicture_fill(&picture1, buf, PIX_FMT_RGB24, width, height);
 348
 349                 // if we already got a SWS context, let's realloc if is not re-useable
 350                 ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
 351                                             width, height, pix_fmt,
 352                                             width, height, PIX_FMT_RGB24,
 353                                             sws_flags, NULL, NULL, NULL);
 354                 if (ci->toRGB_convert_ctx == NULL) {
 355                     av_log(NULL, AV_LOG_ERROR,
 356                            "Cannot initialize the toRGB conversion context\n");
 357                     return;
 358                 }
 359                 // img_convert parameters are          2 first destination, then 4 source
 360                 // sws_scale   parameters are context, 4 first source,      then 2 destination
 361                 sws_scale(ci->toRGB_convert_ctx,
 362                               picture->data, picture->linesize, 0, height,
 363                               picture1.data, picture1.linesize);
 364
 365                     /* Write out the PPM file */
 366                     snprintf(fname, sizeof(fname), "%s/fishimg%ld_%"PRId64".ppm", ci->dir, (long)(av_gettime() / 1000000), pts);
 367                     f = fopen(fname, "w");
 368                     if (f) {
 369                         fprintf(f, "P6 %d %d 255\n", width, height);
 370                         fwrite(buf, width * height * 3, 1, f);
 371                         fclose(f);
 372                     }
 373
 374                 av_free(buf);
 375                 ci->next_pts = pts + ci->min_interval;
 376             }
 377         }
 378     }
 379 }
 380