[common] (frame generators) add ABC

common/polystar/common/frame_generators/frames_generator_abc.py

+from abc import ABC, abstractmethod
+from typing import Generator
+
+from polystar.common.models.image import Image
+
+
+class FrameGeneratorABC(ABC):
+    @abstractmethod
+    def generate(self) -> Generator[Image]:
+        pass

common/polystar/common/frame_generators/video_frame_generator.py

@@ -3,8 +3,10 @@ from pathlib import Path
 import cv2
 import ffmpeg
 
+from polystar.common.frame_generators.frames_generator_abc import FrameGeneratorABC
 
-class VideoFrameGenerator:
+
+class VideoFrameGenerator(FrameGeneratorABC):
     def __init__(self, video_path: Path, desired_fps: int):
         self.video_path: Path = video_path
         self.desired_fps: int = desired_fps