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/* compile with gcc -Wall -o sample-photobooth -lgphoto2 sample-photobooth.c
*
*/
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <signal.h>
#include <gphoto2/gphoto2.h>
#include "samples.h"
#define CONFIG_FILE "config.txt"
#define PREVIEW "preview.jpg"
static void errordumper(GPLogLevel level, const char *domain, const char *str,
void *data) {
/* printf("%s (data %p)\n", str,data);*/
}
/* set by signal handler */
static int capture_now = 0;
static int read_config = 0;
static int
capture_to_file(Camera *camera, GPContext *context, char *fn) {
int fd, retval;
CameraFile *file;
CameraFilePath camera_file_path;
retval = gp_camera_capture(camera, GP_CAPTURE_IMAGE, &camera_file_path, context);
if (retval < GP_OK) return retval;
fd = open(fn, O_CREAT | O_WRONLY, 0644);
retval = gp_file_new_from_fd(&file, fd);
if (retval < GP_OK) {
close(fd);
unlink(fn);
return retval;
}
retval = gp_camera_file_get(camera, camera_file_path.folder, camera_file_path.name,
GP_FILE_TYPE_NORMAL, file, context);
if (retval < GP_OK) {
gp_file_free(file);
unlink(fn);
return retval;
}
retval = gp_camera_file_delete(camera, camera_file_path.folder, camera_file_path.name, context);
gp_file_free(file);
return GP_OK;
}
static void
sig_handler_capture_now (int sig_num)
{
signal (SIGUSR1, sig_handler_capture_now);
capture_now = 1;
}
static void
sig_handler_read_config (int sig_num)
{
signal (SIGUSR2, sig_handler_read_config);
read_config = 1;
}
int
main(int argc, char **argv) {
Camera *camera;
int retval;
int capturecnt = 0;
GPContext *context = sample_create_context();
printf("Sample photobooth.\n");
printf("Continously stores previews in 'preview.jpg'.\n");
printf("kill -USR1 %d to take a capture.\n", getpid());
printf("kill -USR2 %d to read the 'config.txt'.\n", getpid());
printf("kill -TERM %d to finish.\n", getpid());
signal (SIGUSR1, sig_handler_capture_now);
signal (SIGUSR2, sig_handler_read_config);
gp_log_add_func(GP_LOG_ERROR, errordumper, 0);
gp_camera_new(&camera);
retval = gp_camera_init(camera, context);
if (retval != GP_OK) {
printf(" Retval: %d\n", retval);
exit (1);
}
while (1) {
CameraFile *file;
char output_file[32];
/*
* Capture a full picture on demand. Use unique filenames.
*/
if (capture_now) {
capture_now = 0;
sprintf(output_file, "image-%03d.jpg", capturecnt++);
capture_to_file(camera, context, output_file);
}
/*
* Read configuration changes from "config.txt".
*/
if (read_config) {
FILE *config;
char buf[512];
read_config = 0;
config = fopen (CONFIG_FILE, "r");
while (fgets (buf, sizeof(buf), config)) {
char *s;
s = strchr(buf,'=');
if (!s) continue;
*s=0;
retval = set_config_value_string (camera, buf, s+1, context);
if (retval < GP_OK)
fprintf (stderr, "setting configuration '%s' to '%s' failed with %d.\n", buf, s+1, retval);
}
fclose (config);
}
/*
* Capture a preview on every loop. Save as preview.jpg.
*/
retval = gp_file_new(&file);
if (retval != GP_OK) {
fprintf(stderr,"gp_file_new: %d\n", retval);
exit(1);
}
retval = gp_camera_capture_preview(camera, file, context);
if (retval != GP_OK) {
fprintf(stderr,"gp_camera_capture_preview failed: %d\n", retval);
exit(1);
}
retval = gp_file_save(file, PREVIEW);
if (retval != GP_OK) {
fprintf(stderr,"saving preview failed: %d\n", retval);
exit(1);
}
gp_file_unref(file);
/*
* Check and drain the event queue.
* Download newly captured images.
* Ignore the rest events.
*/
while (1) {
CameraEventType evttype;
CameraFilePath *path;
void *evtdata;
int fd;
evtdata = NULL;
retval = gp_camera_wait_for_event (camera, 1, &evttype, &evtdata, context);
if (retval != GP_OK) break;
switch (evttype) {
case GP_EVENT_FILE_ADDED:
path = (CameraFilePath*)evtdata;
printf("File added on the camera: %s/%s\n", path->folder, path->name);
sprintf(output_file, "image-%03d.jpg", capturecnt++);
fd = open(output_file, O_CREAT | O_WRONLY, 0644);
retval = gp_file_new_from_fd(&file, fd);
retval = gp_camera_file_get(camera, path->folder, path->name,
GP_FILE_TYPE_NORMAL, file, context);
retval = gp_camera_file_delete(camera, path->folder, path->name, context);
gp_file_free(file);
free (evtdata);
break;
case GP_EVENT_FOLDER_ADDED:
path = (CameraFilePath*)evtdata;
printf("Folder added on camera: %s / %s\n", path->folder, path->name);
free (evtdata);
break;
case GP_EVENT_CAPTURE_COMPLETE:
printf("Capture Complete.\n");
break;
case GP_EVENT_TIMEOUT:
break;
case GP_EVENT_UNKNOWN:
if (evtdata) {
printf("Unknown event: %s.\n", (char*)evtdata);
free (evtdata);
} else {
printf("Unknown event.\n");
}
break;
default:
printf("Type %d?\n", evttype);
break;
}
if (evttype == GP_EVENT_TIMEOUT)
break;
}
}
gp_camera_exit(camera, context);
return 0;
}
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