initial refactoring

frigate/objects.py

@@ -0,0 +1,48 @@
+import time
+import datetime
+import threading
+
+class ObjectParser(threading.Thread):
+    def __init__(self, object_queue, objects_parsed, detected_objects):
+        threading.Thread.__init__(self)
+        self._object_queue = object_queue
+        self._objects_parsed = objects_parsed
+        self._detected_objects = detected_objects
+
+    def run(self):
+        while True:
+            obj = self._object_queue.get()
+            self._detected_objects.append(obj)
+
+            # notify that objects were parsed
+            with self._objects_parsed:
+                self._objects_parsed.notify_all()
+
+class ObjectCleaner(threading.Thread):
+    def __init__(self, objects_parsed, detected_objects):
+        threading.Thread.__init__(self)
+        self._objects_parsed = objects_parsed
+        self._detected_objects = detected_objects
+
+    def run(self):
+        while True:
+
+            # expire the objects that are more than 1 second old
+            now = datetime.datetime.now().timestamp()
+            # look for the first object found within the last second
+            # (newest objects are appended to the end)
+            detected_objects = self._detected_objects.copy()
+            num_to_delete = 0
+            for obj in detected_objects:
+                if now-obj['frame_time']<1:
+                    break
+                num_to_delete += 1
+            if num_to_delete > 0:
+                del self._detected_objects[:num_to_delete]
+
+                # notify that parsed objects were changed
+                with self._objects_parsed:
+                    self._objects_parsed.notify_all()
+            
+            # wait a bit before checking for more expired frames
+            time.sleep(0.2)