/*
* Fish Detector Hook
* Copyright (c) 2002 Philip Gladstone
*
* This file implements a fish detector. It is used to see when a
* goldfish passes in front of the camera. It does this by counting
* the number of input pixels that fall within a particular HSV
* range.
*
* It takes a multitude of arguments:
*
* -h <num>-<num> the range of H values that are fish
* -s <num>-<num> the range of S values that are fish
* -v <num>-<num> the range of V values that are fish
* -z zap all non-fish values to black
* -l <num> limit the number of saved files to <num>
* -i <num> only check frames every <num> seconds
* -t <num> the threshold for the amount of fish pixels (range 0-1)
* -d turn debugging on
* -D <directory> where to put the fish images
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <stdio.h>
#include <dirent.h>
#include "libavformat/avformat.h"
#include "libavformat/framehook.h"
#include "libavcodec/dsputil.h"
#include "libswscale/swscale.h"
#undef fprintf
static int sws_flags = SWS_BICUBIC;
#define SCALEBITS 10
#define ONE_HALF (1 << (SCALEBITS - 1))
#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5))
#define YUV_TO_RGB1_CCIR(cb1, cr1)\
{\
cb = (cb1) - 128;\
cr = (cr1) - 128;\
r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
ONE_HALF;\
b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
}
#define YUV_TO_RGB2_CCIR(r, g, b, y1)\
{\
yt = ((y1) - 16) * FIX(255.0/219.0);\
r = cm[(yt + r_add) >> SCALEBITS];\
g = cm[(yt + g_add) >> SCALEBITS];\
b = cm[(yt + b_add) >> SCALEBITS];\
}
typedef struct {
int h; /* 0 .. 360 */
int s; /* 0 .. 255 */
int v; /* 0 .. 255 */
} HSV;
typedef struct {
int zapping;
int threshold;
HSV dark, bright;
char *dir;
int file_limit;
int debug;
int min_interval;
int64_t next_pts;
int inset;
int min_width;
struct SwsContext *toRGB_convert_ctx;
} ContextInfo;
static void dorange(const char *s, int *first, int *second, int maxval)
{
sscanf(s, "%d-%d", first, second);
if (*first > maxval)
*first = maxval;
if (*second > maxval)
*second = maxval;
}
void Release(void *ctx)
{
ContextInfo *ci;
ci = (ContextInfo *) ctx;
if (ctx) {
sws_freeContext(ci->toRGB_convert_ctx);
av_free(ctx);
}
}
int Configure(void **ctxp, int argc, char *argv[])
{
ContextInfo *ci;
int c;
*ctxp = av_mallocz(sizeof(ContextInfo));
ci = (ContextInfo *) *ctxp;
optind = 1;
ci->dir = av_strdup("/tmp");
ci->threshold = 100;
ci->file_limit = 100;
ci->min_interval = 1000000;
ci->inset = 10; /* Percent */
while ((c = getopt(argc, argv, "w:i:dh:s:v:zl:t:D:")) > 0) {
switch (c) {
case 'h':
dorange(optarg, &ci->dark.h, &ci->bright.h, 360);
break;
case 's':
dorange(optarg, &ci->dark.s, &ci->bright.s, 255);
break;
case 'v':
dorange(optarg, &ci->dark.v, &ci->bright.v, 255);
break;
case 'z':
ci->zapping = 1;
break;
case 'l':
ci->file_limit = atoi(optarg);
break;
case 'i':
ci->min_interval = 1000000 * atof(optarg);
break;
case 't':
ci->threshold = atof(optarg) * 1000;
if (ci->threshold > 1000 || ci->threshold < 0) {
av_log(NULL, AV_LOG_ERROR, "Invalid threshold value '%s' (range is 0-1)\n", optarg);
return -1;
}
break;
case 'w':
ci->min_width = atoi(optarg);
break;
case 'd':
ci->debug++;
break;
case 'D':
ci->dir = av_strdup(optarg);
break;
default:
av_log(NULL, AV_LOG_ERROR, "Unrecognized argument '%s'\n", argv[optind]);
return -1;
}
}
av_log(NULL, AV_LOG_INFO, "Fish detector configured:\n");
av_log(NULL, AV_LOG_INFO, " HSV range: %d,%d,%d - %d,%d,%d\n",
ci->dark.h,
ci->dark.s,
ci->dark.v,
ci->bright.h,
ci->bright.s,
ci->bright.v);
av_log(NULL, AV_LOG_INFO, " Threshold is %d%% pixels\n", ci->threshold / 10);
return 0;
}
static void get_hsv(HSV *hsv, int r, int g, int b)
{
int i, v, x, f;
x = (r < g) ? r : g;
if (b < x)
x = b;
v = (r > g) ? r : g;
if (b > v)
v = b;
if (v == x) {
hsv->h = 0;
hsv->s = 0;
hsv->v = v;
return;
}
if (r == v) {
f = g - b;
i = 0;
} else if (g == v) {
f = b - r;
i = 2 * 60;
} else {
f = r - g;
i = 4 * 60;
}
hsv->h = i + (60 * f) / (v - x);
if (hsv->h < 0)
hsv->h += 360;
hsv->s = (255 * (v - x)) / v;
hsv->v = v;
return;
}
void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
{
ContextInfo *ci = (ContextInfo *) ctx;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int rowsize = picture->linesize[0];
#if 0
av_log(NULL, AV_LOG_DEBUG, "pix_fmt = %d, width = %d, pts = %lld, ci->next_pts = %lld\n",
pix_fmt, width, pts, ci->next_pts);
#endif
if (pts < ci->next_pts)
return;
if (width < ci->min_width)
return;
ci->next_pts = pts + 1000000;
if (pix_fmt == PIX_FMT_YUV420P) {
uint8_t *y, *u, *v;
int width2 = width >> 1;
int inrange = 0;
int pixcnt;
int h;
int h_start, h_end;
int w_start, w_end;
h_end = 2 * ((ci->inset * height) / 200);
h_start = height - h_end;
w_end = (ci->inset * width2) / 100;
w_start = width2 - w_end;
pixcnt = ((h_start - h_end) >> 1) * (w_start - w_end);
y = picture->data[0] + h_end * picture->linesize[0] + w_end * 2;
u = picture->data[1] + h_end * picture->linesize[1] / 2 + w_end;
v = picture->data[2] + h_end * picture->linesize[2] / 2 + w_end;
for (h = h_start; h > h_end; h -= 2) {
int w;
for (w = w_start; w > w_end; w--) {
unsigned int r,g,b;
HSV hsv;
int cb, cr, yt, r_add, g_add, b_add;
YUV_TO_RGB1_CCIR(u[0], v[0]);
YUV_TO_RGB2_CCIR(r, g, b, y[0]);
get_hsv(&hsv, r, g, b);
if (ci->debug > 1)
av_log(NULL, AV_LOG_DEBUG, "(%d,%d,%d) -> (%d,%d,%d)\n",
r,g,b,hsv.h,hsv.s,hsv.v);
if (hsv.h >= ci->dark.h && hsv.h <= ci->bright.h &&
hsv.s >= ci->dark.s && hsv.s <= ci->bright.s &&
hsv.v >= ci->dark.v && hsv.v <= ci->bright.v) {
inrange++;
} else if (ci->zapping) {
y[0] = y[1] = y[rowsize] = y[rowsize + 1] = 16;
u[0] = 128;
v[0] = 128;
}
y+= 2;
u++;
v++;
}
y += picture->linesize[0] * 2 - (w_start - w_end) * 2;
u += picture->linesize[1] - (w_start - w_end);
v += picture->linesize[2] - (w_start - w_end);
}
if (ci->debug)
av_log(NULL, AV_LOG_INFO, "Fish: Inrange=%d of %d = %d threshold\n", inrange, pixcnt, 1000 * inrange / pixcnt);
if (inrange * 1000 / pixcnt >= ci->threshold) {
/* Save to file */
int size;
char *buf;
AVPicture picture1;
static int frame_counter;
static int foundfile;
if ((frame_counter++ % 20) == 0) {
/* Check how many files we have */
DIR *d;
foundfile = 0;
d = opendir(ci->dir);
if (d) {
struct dirent *dent;
while ((dent = readdir(d))) {
if (strncmp("fishimg", dent->d_name, 7) == 0) {
if (strcmp(".ppm", dent->d_name + strlen(dent->d_name) - 4) == 0) {
foundfile++;
}
}
}
closedir(d);
}
}
if (foundfile < ci->file_limit) {
FILE *f;
char fname[256];
size = avpicture_get_size(PIX_FMT_RGB24, width, height);
buf = av_malloc(size);
avpicture_fill(&picture1, buf, PIX_FMT_RGB24, width, height);
// if we already got a SWS context, let's realloc if is not re-useable
ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
width, height, pix_fmt,
width, height, PIX_FMT_RGB24,
sws_flags, NULL, NULL, NULL);
if (ci->toRGB_convert_ctx == NULL) {
av_log(NULL, AV_LOG_ERROR,
"Cannot initialize the toRGB conversion context\n");
return;
}
// img_convert parameters are 2 first destination, then 4 source
// sws_scale parameters are context, 4 first source, then 2 destination
sws_scale(ci->toRGB_convert_ctx,
picture->data, picture->linesize, 0, height,
picture1.data, picture1.linesize);
/* Write out the PPM file */
snprintf(fname, sizeof(fname), "%s/fishimg%ld_%"PRId64".ppm", ci->dir, (long)(av_gettime() / 1000000), pts);
f = fopen(fname, "w");
if (f) {
fprintf(f, "P6 %d %d 255\n", width, height);
if (!fwrite(buf, width * height * 3, 1, f))
av_log(ctx, AV_LOG_ERROR, "Couldn't write to PPM file %s\n", fname);
fclose(f);
}
av_free(buf);
ci->next_pts = pts + ci->min_interval;
}
}
}
}