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ffmpeg/vhook/fish.c
Philip Gladstone 6c11d48cab Added a release function to free up the context. Also removed the dummy 
declarations at the bottom of the file. This type checking is now handled by the
header file.

Originally committed as revision 1295 to svn://svn.ffmpeg.org/ffmpeg/trunk
2002-11-30 17:17:58 +00:00

333 lines
9.4 KiB
C
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/*
* 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 library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 "framehook.h"
#include "dsputil.h"
#define SCALE_BITS 10
#define C_Y (76309 >> (16 - SCALE_BITS))
#define C_RV (117504 >> (16 - SCALE_BITS))
#define C_BU (138453 >> (16 - SCALE_BITS))
#define C_GU (13954 >> (16 - SCALE_BITS))
#define C_GV (34903 >> (16 - SCALE_BITS))
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 next_pts;
int inset;
int min_width;
} 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)
{
if (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 = 0;
ci->dir = "/tmp";
ci->threshold = 1000;
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;
break;
case 'w':
ci->min_width = atoi(optarg);
break;
case 'd':
ci->debug++;
break;
case 'D':
ci->dir = strdup(optarg);
break;
default:
fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
return -1;
}
}
fprintf(stderr, "Fish detector configured:\n");
fprintf(stderr, " 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);
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 pts)
{
ContextInfo *ci = (ContextInfo *) ctx;
UINT8 *cm = cropTbl + MAX_NEG_CROP;
int rowsize = picture->linesize[0];
if (pts < ci->next_pts)
return;
if (width < ci->min_width)
return;
ci->next_pts = pts + 1000000;
if (pix_fmt == PIX_FMT_YUV420P) {
UINT8 *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];
u = picture->data[1];
v = picture->data[2];
for (h = h_start; h > h_end; h -= 2) {
int w;
for (w = w_start; w > w_end; w--) {
int r,g,b;
int Y, U, V;
HSV hsv;
U = u[0] - 128;
V = v[0] - 128;
Y = (y[0] - 16) * C_Y;
r = cm[(Y + C_RV * V + (1 << (SCALE_BITS - 1))) >> SCALE_BITS];
g = cm[(Y + - C_GU * U - C_GV * V + (1 << (SCALE_BITS - 1))) >> SCALE_BITS];
b = cm[(Y + C_BU * U + (1 << (SCALE_BITS - 1))) >> SCALE_BITS];
get_hsv(&hsv, r, g, b);
if (ci->debug > 1)
fprintf(stderr, "(%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] = 0;
}
y+= 2;
u++;
v++;
}
y += picture->linesize[0] * 2 - width;
u += picture->linesize[1] - width2;
v += picture->linesize[2] - width2;
}
if (inrange * 1000 / pixcnt >= ci->threshold) {
/* Save to file */
int size;
char *buf;
AVPicture picture1;
static int frame_counter;
static int foundfile;
if (ci->debug)
fprintf(stderr, "Fish: Inrange=%d of %d = %d threshold\n", inrange, pixcnt, 1000 * inrange / pixcnt);
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) {
size = avpicture_get_size(PIX_FMT_RGB24, width, height);
buf = av_malloc(size);
avpicture_fill(&picture1, buf, PIX_FMT_RGB24, width, height);
if (img_convert(&picture1, PIX_FMT_RGB24,
picture, pix_fmt, width, height) >= 0) {
/* Write out the PPM file */
FILE *f;
char fname[256];
sprintf(fname, "%s/fishimg%ld_%lld.ppm", ci->dir, time(0), pts);
f = fopen(fname, "w");
if (f) {
fprintf(f, "P6 %d %d 255\n", width, height);
fwrite(buf, width * height * 3, 1, f);
fclose(f);
}
}
av_free(buf);
ci->next_pts = pts + ci->min_interval;
}
}
}
}
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