修改打包方式

src/screencast/recorder.py

@@ -0,0 +1,63 @@
+"""全屏截帧引擎，后台线程持续截图存为 PNG 帧序列。"""
+from __future__ import annotations
+
+import threading
+import time
+from pathlib import Path
+from typing import Optional
+
+import mss
+import mss.tools
+
+
+class ScreenRecorder:
+    def __init__(
+        self,
+        frames_dir: str,
+        fps: int = 10,
+        monitor_index: Optional[int] = None,
+    ):
+        """
+        Args:
+            monitor_index: mss 显示器索引；None=monitors[0]（所有屏合并区域，
+                          旧行为），1=主屏，2+=第 N 屏。多显示器场景推荐显式传 1。
+        """
+        self._frames_dir = Path(frames_dir)
+        self._fps = fps
+        self._monitor_index = monitor_index
+        self._stop_event = threading.Event()
+        self._thread: threading.Thread | None = None
+        self._frame_count = 0
+
+    def start(self) -> None:
+        self._frames_dir.mkdir(parents=True, exist_ok=True)
+        self._stop_event.clear()
+        self._frame_count = 0
+        self._thread = threading.Thread(target=self._capture_loop, daemon=True)
+        self._thread.start()
+
+    def stop(self) -> None:
+        self._stop_event.set()
+        if self._thread:
+            self._thread.join(timeout=10)
+
+    @property
+    def frame_count(self) -> int:
+        return self._frame_count
+
+    def _capture_loop(self) -> None:
+        interval = 1.0 / self._fps
+        with mss.mss() as sct:
+            idx = self._monitor_index if self._monitor_index is not None else 0
+            if idx < 0 or idx >= len(sct.monitors):
+                idx = 0  # 越界兜底
+            monitor = sct.monitors[idx]
+            while not self._stop_event.is_set():
+                t0 = time.perf_counter()
+                img = sct.grab(monitor)
+                path = self._frames_dir / f"frame_{self._frame_count:06d}.png"
+                mss.tools.to_png(img.rgb, img.size, output=str(path))
+                self._frame_count += 1
+                elapsed = time.perf_counter() - t0
+                sleep = max(0.0, interval - elapsed)
+                time.sleep(sleep)