added a best-iso sample program for Canon EOS

git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@14925 67ed7778-7388-44ab-90cf-0a291f65f57c

1 files changed, 181 insertions, 0 deletions

diff --git a/examples/best-iso.c b/examples/best-iso.c
new file mode 100644
index 000000000..8234d34e4
--- /dev/null
+++ b/examples/best-iso.c
@@ -0,0 +1,181 @@
+/* 
+ * This program tries various ISOs for best ISO with a shutterspeed limit
+ *
+ * compile with: gcc -Wall -o best-iso best-iso.c context.c config.c -lgphoto2 -lgphoto2_port
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <gphoto2/gphoto2.h>
+
+#include "samples.h"
+
+static int aperture;
+static float shutterspeed;
+
+static void errordumper(GPLogLevel level, const char *domain, const char *str,
+                 void *data) {
+  fprintf(stdout, "%s\n", str);
+}
+
+static int
+camera_tether(Camera *camera, GPContext *context) {
+	int fd, retval;
+	CameraFile *file;
+	CameraEventType	evttype;
+	CameraFilePath	*path;
+	void	*evtdata;
+
+	printf("Tethering...\n");
+
+	while (1) {
+		retval = gp_camera_wait_for_event (camera, 1000, &evttype, &evtdata, context);
+		if (retval != GP_OK)
+			return retval;
+		switch (evttype) {
+		case GP_EVENT_FILE_ADDED:
+			path = (CameraFilePath*)evtdata;
+			printf("File added on the camera: %s/%s\n", path->folder, path->name);
+
+			fd = open(path->name, O_CREAT | O_WRONLY, 0644);
+			retval = gp_file_new_from_fd(&file, fd);
+			printf("  Downloading %s...\n", path->name);
+			retval = gp_camera_file_get(camera, path->folder, path->name,
+				     GP_FILE_TYPE_NORMAL, file, context);
+
+			printf("  Deleting %s on camera...\n", path->name);
+			retval = gp_camera_file_delete(camera, path->folder, path->name, context);
+			gp_file_free(file);
+			break;
+		case GP_EVENT_FOLDER_ADDED:
+			path = (CameraFilePath*)evtdata;
+			printf("Folder added on camera: %s / %s\n", path->folder, path->name);
+			break;
+		case GP_EVENT_CAPTURE_COMPLETE:
+			printf("Capture Complete.\n");
+			break;
+		case GP_EVENT_TIMEOUT:
+			printf("Timeout.\n");
+			return GP_OK;
+		case GP_EVENT_UNKNOWN:
+			if (evtdata) {
+				char *val;
+				int ret;
+
+				printf("Unknown event: %s.\n", (char*)evtdata);
+				/* 3 eos properties hardcoded */
+				if (strstr(evtdata,"d103")) {
+					ret = get_config_value_string(camera,"iso",&val,context);
+					if (ret == GP_OK)
+						printf("ISO is %s\n", val);
+				}
+				if (strstr(evtdata,"d102")) {
+					ret = get_config_value_string(camera,"shutterspeed",&val,context);
+					if (ret == GP_OK) {
+						if (strchr(val,'/')) {
+							int zaehler,nenner;
+							sscanf(val,"%d/%d",&zaehler,&nenner);
+							shutterspeed = 1.0*zaehler/nenner;
+						} else {
+							sscanf(val,"%g",&shutterspeed);
+						}
+						printf("Shutterspeed is %s (%g)\n", val, shutterspeed);
+					}
+				}
+				if (strstr(evtdata,"d101")) {
+					ret = get_config_value_string(camera,"aperture",&val,context);
+					if (ret == GP_OK) {
+						float ap;
+
+						sscanf(val,"%g",&ap);
+						aperture = 10*ap;
+						printf("Aperture is %s (%d)\n", val, aperture);
+					}
+				}
+			} else {
+				printf("Unknown event.\n");
+			}
+			break;
+		default:
+			printf("Type %d?\n", evttype);
+			break;
+		}
+	}
+}
+
+int
+main(int argc, char **argv) {
+	Camera	*camera;
+	int	retval, iso;
+	char	buf[20];
+	GPContext *context = sample_create_context();
+
+	gp_log_add_func(GP_LOG_ERROR, errordumper, NULL);
+	gp_camera_new(&camera);
+
+	retval = gp_camera_init(camera, context);
+	if (retval != GP_OK) {
+		printf("  camera failed to initialize: %d\n", retval);
+		exit (1);
+	}
+
+	retval = camera_tether(camera, context);
+	if (retval != GP_OK) {
+		printf("Tether error: %d\n", retval);
+		exit (1);
+	}
+
+	iso = 100;
+
+	shutterspeed = 0.0;
+	aperture = 0;
+
+	while (1) {
+		sprintf(buf,"%d",iso);
+		printf("Setting ISO to %d\n",iso);
+
+		retval = set_config_value_string(camera, "iso", buf, context);
+		if (retval != GP_OK) {
+			printf("  failed setting ISO to %d: %d\n", iso, retval);
+
+			/* usually also happens if too dark */
+			exit (1);
+		}
+
+		printf("eosremoterelease half press\n");
+		retval = set_config_value_string(camera,"eosremoterelease", "Press Half", context);
+		if (retval != GP_OK) {
+			printf("  failed pressing shutter to half: %d\n", retval);
+			exit (1);
+		}
+
+		retval = camera_tether(camera, context);
+		if (retval != GP_OK) {
+			printf("Tether error: %d\n", retval);
+			exit (1);
+		}
+
+		printf("eosremoterelease release\n");
+		retval = set_config_value_string(camera,"eosremoterelease", "Release Half", context);
+		if (retval != GP_OK) {
+			printf("  failed releasing shutter button from half: %d\n", retval);
+			exit (1);
+		}
+
+		if (shutterspeed < 30) {
+			printf("ISO %d has Aperture %g and Shutterspeed %g\n", iso, aperture/10.0, shutterspeed);
+			/*break;*/
+		}
+		iso = iso*2;
+	}
+
+	gp_camera_exit(camera, context);
+	return 0;
+}