Megapixels/tools/camera_test.c

#include "camera.h"
#include "device.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

double
get_time()
{
	struct timeval t;
	struct timezone tzp;
	gettimeofday(&t, &tzp);
	return t.tv_sec + t.tv_usec * 1e-6;
}

void
on_capture(MPImage image, void *user_data)
{
	size_t num_bytes =
		mp_pixel_format_width_to_bytes(image.pixel_format, image.width) *
		image.height;
	uint8_t *data = malloc(num_bytes);
	memcpy(data, image.data, num_bytes);

	printf("      first byte: %d.", data[0]);

	free(data);
}

int
main(int argc, char *argv[])
{
	if (argc != 2 && argc != 3) {
		printf("Usage: %s <media_device_name> [<sub_device_name>]\n",
		       argv[0]);
		return 1;
	}

	char *video_name = argv[1];
	char *subdev_name = NULL;
	if (argc == 3) {
		subdev_name = argv[2];
	}

	double find_start = get_time();

	// First find the device
	MPDevice *device = mp_device_find(video_name);
	if (!device) {
		printf("Device not found\n");
		return 1;
	}

	double find_end = get_time();

	printf("Finding the device took %fms\n", (find_end - find_start) * 1000);

	int video_fd;
	uint32_t video_entity_id;
	{
		const struct media_v2_entity *entity =
			mp_device_find_entity(device, video_name);
		if (!entity) {
			printf("Unable to find video device interface\n");
			return 1;
		}

		video_entity_id = entity->id;

		const struct media_v2_interface *iface =
			mp_device_find_entity_interface(device, video_entity_id);

		char buf[256];
		if (!mp_find_device_path(iface->devnode, buf, 256)) {
			printf("Unable to find video device path\n");
			return 1;
		}

		video_fd = open(buf, O_RDWR);
		if (video_fd == -1) {
			printf("Unable to open video device\n");
			return 1;
		}
	}

	int subdev_fd = -1;
	if (subdev_name) {
		const struct media_v2_entity *entity =
			mp_device_find_entity(device, subdev_name);
		if (!entity) {
			printf("Unable to find sub-device\n");
			return 1;
		}

		const struct media_v2_pad *source_pad =
			mp_device_get_pad_from_entity(device, entity->id);
		const struct media_v2_pad *sink_pad =
			mp_device_get_pad_from_entity(device, video_entity_id);

		// Disable other links
		const struct media_v2_entity *entities =
			mp_device_get_entities(device);
		for (int i = 0; i < mp_device_get_num_entities(device); ++i) {
			if (entities[i].id != video_entity_id &&
			    entities[i].id != entity->id) {
				const struct media_v2_pad *pad =
					mp_device_get_pad_from_entity(
						device, entities[i].id);
				mp_device_setup_link(device, pad->id, sink_pad->id,
						     false);
			}
		}

		// Then enable ours
		mp_device_setup_link(device, source_pad->id, sink_pad->id, true);

		const struct media_v2_interface *iface =
			mp_device_find_entity_interface(device, entity->id);

		char buf[256];
		if (!mp_find_device_path(iface->devnode, buf, 256)) {
			printf("Unable to find sub-device path\n");
			return 1;
		}

		subdev_fd = open(buf, O_RDWR);
		if (subdev_fd == -1) {
			printf("Unable to open sub-device\n");
			return 1;
		}
	}

	double open_end = get_time();

	printf("Opening the device took %fms\n", (open_end - find_end) * 1000);

	MPCamera *camera = mp_camera_new(video_fd, subdev_fd);

	MPControlList *controls = mp_camera_list_controls(camera);

	double control_list_end = get_time();

	printf("Available controls: (took %fms)\n",
	       (control_list_end - open_end) * 1000);
	for (MPControlList *list = controls; list;
	     list = mp_control_list_next(list)) {
		MPControl *c = mp_control_list_get(list);

		printf("  %32s id:%s type:%s default:%d\n", c->name,
		       mp_control_id_to_str(c->id), mp_control_type_to_str(c->type),
		       c->default_value);
	}

	double mode_list_begin = get_time();

	MPCameraModeList *modes = mp_camera_list_available_modes(camera);

	double mode_list_end = get_time();

	printf("Available modes: (took %fms)\n",
	       (mode_list_end - mode_list_begin) * 1000);
	for (MPCameraModeList *list = modes; list;
	     list = mp_camera_mode_list_next(list)) {
		MPCameraMode *m = mp_camera_mode_list_get(list);
		printf("  %dx%d interval:%d/%d fmt:%s\n", m->width, m->height,
		       m->frame_interval.numerator, m->frame_interval.denominator,
		       mp_pixel_format_to_str(m->pixel_format));

		// Skip really slow framerates
		if (m->frame_interval.denominator < 15) {
			printf("    Skipping…\n");
			continue;
		}

		double start_capture = get_time();

		mp_camera_set_mode(camera, m);
		mp_camera_start_capture(camera);

		double last = get_time();
		printf("    Testing 10 captures, starting took %fms\n",
		       (last - start_capture) * 1000);

		for (int i = 0; i < 10; ++i) {
			mp_camera_capture_image(camera, on_capture, NULL);

			double now = get_time();
			printf(" capture took %fms\n", (now - last) * 1000);
			last = now;
		}

		mp_camera_stop_capture(camera);
	}

	double cleanup_start = get_time();

	mp_camera_free(camera);

	close(video_fd);
	if (subdev_fd != -1)
		close(subdev_fd);

	mp_device_close(device);

	double cleanup_end = get_time();

	printf("Cleanup took %fms\n", (cleanup_end - cleanup_start) * 1000);
}