feat: implement camera management with GPhotoCamera and CameraManager classes

core/camera/base_camera.py

@@ -0,0 +1,22 @@
+from abc import ABC, abstractmethod
+from PySide6.QtCore import Signal
+
+
+class BaseCamera(ABC):
+    def __init__(self) -> None:
+        self.error_msg = None
+
+    @abstractmethod
+    def connect(self) -> bool:
+        raise NotImplementedError
+
+    @abstractmethod
+    def disconnect(self) -> None:
+        raise NotImplementedError
+
+    @abstractmethod
+    def get_frame(self):
+        raise NotImplementedError
+    
+    def get_error_msg(self):
+        return str(self.error_msg)

core/camera/camera_manager.py

@@ -0,0 +1,86 @@
+from PySide6.QtCore import QObject, QThread, QTimer, Signal, Slot
+from PySide6.QtGui import QImage, QPixmap
+import cv2
+
+from .base_camera import BaseCamera
+
+
+class CameraManager(QThread):
+    frame_ready = Signal(QPixmap)
+    photo_ready = Signal(QPixmap)
+    error_occurred = Signal(str)
+
+    def __init__(self, camera: BaseCamera, fps: int = 15, parent: QObject | None = None) -> None:
+        super().__init__(parent)
+        self.camera = camera
+        self.fps = fps
+        self.timer = None
+        self.is_streaming = False
+
+        self.is_connected = False
+
+
+        self.start()
+
+    def run(self) -> None:
+        self.timer = QTimer()
+        self.timer.setInterval(int(1000 / self.fps))
+        self.timer.timeout.connect(self._update_frame)
+        self.exec()
+
+    def start_camera(self) -> None:
+        if self.is_connected:
+            return
+        
+        if self.camera.connect():
+            self.is_connected = True
+        else:
+            self.is_connected = False
+            self.error_occurred.emit(self.camera.get_error_msg())
+
+    def stop_camera(self) -> None:
+        self.is_streaming = False
+        self.is_connected = False
+        if self.timer:
+            self.timer.stop()
+        self.camera.disconnect()
+
+    def start_stream(self):
+        if not self.is_connected:
+            return
+        
+        if self.is_streaming:
+            return
+        
+        if self.timer:
+            self.is_streaming = True
+            self.timer.start()
+
+    def stop_stream(self) -> None:
+        if self.is_streaming:
+            self.is_streaming = False
+            if self.timer:
+                self.timer.stop()
+
+    def _update_frame(self) -> None:
+        if not self.is_streaming or not self.is_connected:
+            return
+
+        ret, frame = self.camera.get_frame()
+
+        if not ret:
+            self.error_occurred.emit(self.camera.get_error_msg())
+            return
+
+        if frame is not None:
+            rgb_image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
+            h, w, ch = rgb_image.shape
+            qimg = QImage(rgb_image.data, w, h, ch * w, QImage.Format.Format_RGB888)
+            pixmap = QPixmap.fromImage(qimg)
+
+            self.frame_ready.emit(pixmap)
+
+    def stop(self):
+        self.stop_camera()
+        self.quit()
+        self.wait()

core/camera/gphoto_camera.py

@@ -0,0 +1,46 @@
+import gphoto2 as gp
+import cv2
+import numpy as np
+
+from .base_camera import BaseCamera
+
+class GPhotoCamera(BaseCamera):
+    def __init__(self) -> None:
+        super().__init__()
+        self.camera = None
+
+    def connect(self) -> bool:
+        self.error_msg = None
+        try:
+            self.camera = gp.Camera()   # type: ignore
+            self.camera.init()
+            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
+
+    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)
+