Retrait verrou camera et threading : revert approche simple sans deadlock

backend/camera.py

@@ -1,7 +1,6 @@
 import io
 import logging
 import subprocess
-import threading
 import time
 from datetime import datetime
 
@@ -67,7 +66,6 @@ class Camera:
         self.webcam = None
         self.webcam_index = -1
         self.preview_dslr_ok = True  # True si le dernier preview DSLR a reussi
-        self._lock = threading.Lock()  # Verrou pour eviter acces gphoto2 concurrent
 
     def connecter(self, source=None) -> bool:
         """Connecte la camera. source: 'gphoto2', 'webcam:0', 'webcam:2', etc."""
@@ -147,7 +145,6 @@ class Camera:
     def _capture_gphoto2(self, chemin_dest: Path) -> Path | None:
         from PIL import Image as PILImage
 
-        with self._lock:
         for attempt in range(3):
             try:
                 chemin_camera = self.camera.capture(gp.GP_CAPTURE_IMAGE)
@@ -201,10 +198,9 @@ class Camera:
             return None  # Pas de simulation ni webcam en dehors du mode dedie
 
     def activer_viewfinder(self):
-        """Active le LiveView sur les Canon (nécessaire avant capture_preview)."""
+        """Active le LiveView sur les Canon."""
         if self.mode != "gphoto2" or not self.connectee:
             return
-        with self._lock:
         try:
             cfg = self.camera.get_config()
             vf = cfg.get_child_by_name("viewfinder")
@@ -218,7 +214,6 @@ class Camera:
         """Désactive le LiveView."""
         if self.mode != "gphoto2" or not self.connectee:
             return
-        with self._lock:
         try:
             cfg = self.camera.get_config()
             vf = cfg.get_child_by_name("viewfinder")
@@ -229,7 +224,6 @@ class Camera:
             log.warning(f"Viewfinder non supporté : {e}")
 
     def _preview_gphoto2(self) -> bytes | None:
-        with self._lock:
         try:
             fichier = self.camera.capture_preview()
             donnees = bytes(fichier.get_data_and_size())