refactor existing motion detector

frigate/motion/__init__.py

@@ -0,0 +1,21 @@
+from abc import ABC, abstractmethod
+from typing import Tuple
+
+from frigate.config import MotionConfig
+
+
+class MotionDetector(ABC):
+    @abstractmethod
+    def __init__(
+        self,
+        frame_shape: Tuple[int, int, int],
+        config: MotionConfig,
+        improve_contrast,
+        threshold,
+        contour_area,
+    ):
+        pass
+
+    @abstractmethod
+    def detect(self, frame):
+        pass

frigate/motion/frigate_motion.py

@@ -3,9 +3,10 @@ import imutils
 import numpy as np
 
 from frigate.config import MotionConfig
+from frigate.motion import MotionDetector
 
 
-class MotionDetector:
+class FrigateMotionDetector(MotionDetector):
     def __init__(
         self,
         frame_shape,

frigate/video.py

@@ -18,6 +18,7 @@ from frigate.config import CameraConfig, DetectConfig, PixelFormatEnum
 from frigate.const import CACHE_DIR
 from frigate.log import LogPipe
 from frigate.motion import MotionDetector
+from frigate.motion.frigate_motion import FrigateMotionDetector
 from frigate.object_detection import RemoteObjectDetector
 from frigate.track import ObjectTracker
 from frigate.track.norfair_tracker import NorfairTracker
@@ -462,7 +463,7 @@ def track_camera(
     objects_to_track = config.objects.track
     object_filters = config.objects.filters
 
-    motion_detector = MotionDetector(
+    motion_detector = FrigateMotionDetector(
         frame_shape,
         config.motion,
         improve_contrast_enabled,