Add camera rotation feature with configurable degrees

app/camera.py

@@ -35,6 +35,19 @@ def backend_for_name(name: str) -> int:
     return cv2.CAP_ANY
 
 
+def rotate_frame(frame: np.ndarray, degrees: int) -> np.ndarray:
+    normalized = degrees % 360
+    if normalized == 0:
+        return frame
+    if normalized == 90:
+        return cv2.rotate(frame, cv2.ROTATE_90_CLOCKWISE)
+    if normalized == 180:
+        return cv2.rotate(frame, cv2.ROTATE_180)
+    if normalized == 270:
+        return cv2.rotate(frame, cv2.ROTATE_90_COUNTERCLOCKWISE)
+    return frame
+
+
 class CameraWorker(QThread):
     frame_ready = Signal(object)
     detection_ready = Signal(object)
@@ -98,6 +111,9 @@ class CameraWorker(QThread):
                     time.sleep(0.2)
                     continue
 
+                with self._lock:
+                    rotation_degrees = int(self.config["camera"].get("rotation_degrees", 0))
+                frame = rotate_frame(frame, rotation_degrees)
                 self.frame_ready.emit(frame)
                 self._maybe_detect(frame)
         finally: