Dynamic Management of Cameras (#18671)

* Add base class for global config updates

* Add or remove camera states

* Move camera process management to separate thread

* Move camera management fully to separate class

* Cleanup

* Stop camera processes when stop command is sent

* Start processes dynamically when needed

* Adjust

* Leave extra room in tracked object queue for two cameras

* Dynamically set extra config pieces

* Add some TODOs

* Fix type check

* Simplify config updates

* Improve typing

* Correctly handle indexed entries

* Cleanup

* Create out SHM

* Use ZMQ for signaling object detectoin is completed

* Get camera correctly created

* Cleanup for updating the cameras config

* Cleanup

* Don't enable audio if no cameras have audio transcription

* Use exact string so similar camera names don't interfere

* Add ability to update config via json body to config/set endpoint

Additionally, update the config in a single rather than multiple calls for each updated key

* fix autotracking calibration to support new config updater function

---------

Co-authored-by: Josh Hawkins <32435876+hawkeye217@users.noreply.github.com>

frigate/comms/object_detector_signaler.py

@@ -0,0 +1,21 @@
+"""Facilitates communication between processes for object detection signals."""
+
+from .zmq_proxy import Publisher, Subscriber
+
+
+class ObjectDetectorPublisher(Publisher):
+    """Publishes signal for object detection to different processes."""
+
+    topic_base = "object_detector/"
+
+
+class ObjectDetectorSubscriber(Subscriber):
+    """Simplifies receiving a signal for object detection."""
+
+    topic_base = "object_detector/"
+
+    def __init__(self, topic: str) -> None:
+        super().__init__(topic)
+
+    def check_for_update(self):
+        return super().check_for_update(timeout=5)

frigate/comms/webpush.py

@@ -81,7 +81,7 @@ class WebPushClient(Communicator):  # type: ignore[misc]
             "config/notifications", exact=True
         )
         self.config_subscriber = CameraConfigUpdateSubscriber(
-            self.config.cameras, [CameraConfigUpdateEnum.notifications]
+            self.config, self.config.cameras, [CameraConfigUpdateEnum.notifications]
         )
 
     def subscribe(self, receiver: Callable) -> None:
@@ -170,7 +170,12 @@ class WebPushClient(Communicator):  # type: ignore[misc]
         if updated_notification_config:
             self.config.notifications = updated_notification_config
 
-        self.config_subscriber.check_for_updates()
+        updates = self.config_subscriber.check_for_updates()
+
+        if "add" in updates:
+            for camera in updates["add"]:
+                self.suspended_cameras[camera] = 0
+                self.last_camera_notification_time[camera] = 0
 
         if topic == "reviews":
             decoded = json.loads(payload)