RTSP 连接前先查_camera_signal缓存状态，离线摄像头直接显示超时不连接

- activate_bucket 中启用 RTSP 前检查在线状态
- _retry_rtsp 中重连前检查，离线则取消重连
- _start_rtsp_retry 中离线不启动重连计时器

hookvision/main_window.py

@@ -674,6 +674,8 @@ class MainWindow(QMainWindow):
         cam = next((c for c in self.active_bucket.cameras if c.position == (CameraPosition.LEFT if side == "left" else CameraPosition.RIGHT)), None)
         if not cam:
             return
+        if not self._is_camera_online(cam):
+            return
         label = self.left_label if side == "left" else self.right_label
         delay = self._rtsp_retry_delay_left if side == "left" else self._rtsp_retry_delay_right
         label.setText(f"正在重连({delay}s)...")
@@ -695,6 +697,10 @@ class MainWindow(QMainWindow):
         if not cam:
             return
         label = self.left_label if side == "left" else self.right_label
+        if not self._is_camera_online(cam):
+            self.show_timeout_on_label(label)
+            self._cancel_rtsp_retry(side)
+            return
         self.show_loading_on_label(label)
         w, h = label.width(), label.height()
         timeout = self.config.video.rtsp_timeout
@@ -733,7 +739,12 @@ class MainWindow(QMainWindow):
             if player:
                 player.set_ai_objects(objects)
 
-    # ---------- 点击工位 ----------
+    def _is_camera_online(self, cam) -> bool:
+        m = re.search(r'rtsp://(?:[^@]+@)?([^:/]+)', cam.rtsp_url)
+        if not m:
+            return False
+        lat = self._camera_signal.get(m.group(1))
+        return lat is not None and lat >= 0
     def on_bucket_clicked(self, bucket: BucketModel):
         if self.switch_mode != SwitchMode.HAND:
             self.switch_mode = SwitchMode.HAND
@@ -866,7 +877,7 @@ class MainWindow(QMainWindow):
             left_cam = next((c for c in bucket.cameras if c.position == CameraPosition.LEFT), None)
             right_cam = next((c for c in bucket.cameras if c.position == CameraPosition.RIGHT), None)
 
-            if left_cam:
+            if left_cam and self._is_camera_online(left_cam):
                 w = self.left_label.width()
                 h = self.left_label.height()
                 timeout = self.config.video.rtsp_timeout
@@ -876,8 +887,10 @@ class MainWindow(QMainWindow):
                 player.timeout.connect(lambda p=player: self.on_player_timeout(self.left_label, p, "left"))
                 self.left_player = player
                 player.start()
+            elif left_cam:
+                self.show_timeout_on_label(self.left_label)
 
-            if right_cam:
+            if right_cam and self._is_camera_online(right_cam):
                 w = self.right_label.width()
                 h = self.right_label.height()
                 timeout = self.config.video.rtsp_timeout
@@ -887,6 +900,8 @@ class MainWindow(QMainWindow):
                 player.timeout.connect(lambda p=player: self.on_player_timeout(self.right_label, p, "right"))
                 self.right_player = player
                 player.start()
+            elif right_cam:
+                self.show_timeout_on_label(self.right_label)
         else:
             self._unsubscribe_all_topics()
             self.left_label.clear()