MayoStainHelper/core/camera/gphoto_camera.py

from typing import Optional, List
from dataclasses import dataclass, field
import cv2
import numpy as np

from .base_camera import BaseCamera

try:
	import gphoto2 as gp	# type: ignore
except:
	import controllers.mock_gphoto as gp

camera_widget_types = {
	gp.GP_WIDGET_WINDOW: "GP_WIDGET_WINDOW",    # type: ignore
	gp.GP_WIDGET_SECTION: "GP_WIDGET_SECTION",  # type: ignore
	gp.GP_WIDGET_TEXT: "GP_WIDGET_TEXT",        # type: ignore
	gp.GP_WIDGET_RANGE: "GP_WIDGET_RANGE",      # type: ignore
	gp.GP_WIDGET_TOGGLE: "GP_WIDGET_TOGGLE",    # type: ignore
	gp.GP_WIDGET_RADIO: "GP_WIDGET_RADIO",      # type: ignore
	gp.GP_WIDGET_MENU: "GP_WIDGET_MENU",        # type: ignore
	gp.GP_WIDGET_BUTTON: "GP_WIDGET_BUTTON",    # type: ignore
	gp.GP_WIDGET_DATE: "GP_WIDGET_DATE",        # type: ignore
}

operations = [
    ("GP_OPERATION_NONE", gp.GP_OPERATION_NONE),						# type: ignore
    ("GP_OPERATION_CAPTURE_IMAGE", gp.GP_OPERATION_CAPTURE_IMAGE),		# type: ignore
    ("GP_OPERATION_CAPTURE_VIDEO", gp.GP_OPERATION_CAPTURE_VIDEO),		# type: ignore
    ("GP_OPERATION_CAPTURE_AUDIO", gp.GP_OPERATION_CAPTURE_AUDIO),		# type: ignore
    ("GP_OPERATION_CAPTURE_PREVIEW", gp.GP_OPERATION_CAPTURE_PREVIEW),	# type: ignore
    ("GP_OPERATION_CONFIG", gp.GP_OPERATION_CONFIG),					# type: ignore
    ("GP_OPERATION_TRIGGER_CAPTURE", gp.GP_OPERATION_TRIGGER_CAPTURE),	# type: ignore
]


class GPhotoCamera(BaseCamera):
	def __init__(self) -> None:
		super().__init__()
		self.camera = None
		self.configs: List[dict] = []
		self.camera_index = 0

	@staticmethod
	def detect() -> dict:
		cameras = gp.check_result(gp.gp_camera_autodetect()) # type: ignore
		# cameras = gp.Camera().autodetect()
		if not cameras or cameras.count() == 0:  # type: ignore
			return {}
		
		abilities_list = gp.CameraAbilitiesList()	# type: ignore
		abilities_list.load()
		camera_list = {}
		for i in range(cameras.count()):     # type: ignore
			name = cameras.get_name(i)       # type: ignore
			port = cameras.get_value(i)      # type: ignore

			abilities_index = abilities_list.lookup_model(name)
			abilities = abilities_list.get_abilities(abilities_index)
			abilities_name = []
			for name, bit in operations:
					if abilities.operations & bit:	# type: ignore
						abilities_name.append(name)

			camera_list[i] = {"name": name, "port": port, "abilities": abilities_name}
		return camera_list
	
	def connect(self, index: int | None = None) -> bool:
		self.error_msg = None
		self.camera = gp.Camera()   # type: ignore
		
		try:
			if index:
				self.camera_index = index
				camera_list = GPhotoCamera.detect()
				port_info_list = gp.PortInfoList()
				port_info_list.load()

				port_address = camera_list[index]["port"]
				port_index = port_info_list.lookup_path(port_address)
		
				self.camera.set_port_info(port_info_list[port_index])
		 
			self.camera.init()
			config = self.camera.get_config()
			self.read_config(config)
			return True
		except Exception as e:
			self.error_msg = f"[GPHOTO2] {e}"
			self.camera = None
			return False

	def disconnect(self) -> None:
		if self.camera:
			self.camera.exit()
			self.camera = None
			self.configs.clear()

	def get_frame(self):
		self.error_msg = None

		if self.camera is None:
			self.error_msg = "[GPHOTO2] Camera is not initialized."
			return (False, None)

		try:
			file = self.camera.capture_preview()    # type: ignore
			data = file.get_data_and_size()
			frame = np.frombuffer(data, dtype=np.uint8)
			frame = cv2.imdecode(frame, cv2.IMREAD_COLOR)

			return (True, frame)
		except Exception as e:
			self.error_msg = f"[GPHOTO2] {e}"
			return (False, None)

	def get_config_by_id(self, id: int):
		return next(w for w in self.configs if w['id'] == id)

	def get_config_by_name(self, name: str):
		return next(w for w in self.configs if w['name'] == name)

	def set_config(self, config, value):
		if value not in config['choices']:
			return

		config['widget'].set_value(value)  # type: ignore
		if self._save_config(config):
			config['value'] = value

	def set_config_by_id(self, id: int, value: str):
		config = self.get_config_by_id(id)

		self.set_config(config, value)

	def set_config_by_name(self, name: str, value: str):
		config = self.get_config_by_name(name)

		self.set_config(config, value)

	def _save_config(self, config):
		if not self.camera:
			return False

		self.camera.set_single_config(config['name'], config['widget'])
		return True

	def parse_config(self, config):
		new_config = {
			"id": config.get_id(),
			"name": config.get_name(),
			"label": config.get_label(),
			"type": camera_widget_types[config.get_type()],
			"widget": config
		}

		try:
			new_config["value"] = config.get_value()
		except gp.GPhoto2Error:
			pass

		try:
			new_config["choices"] = list(config.get_choices())
		except gp.GPhoto2Error:
			pass

		return new_config

	def read_config(self, config):
		self.configs.append(self.parse_config(config))

		for i in range(config.count_children()):
			child = config.get_child(i)
			self.read_config(child)