ykcheungab
71 lines
2.1 KiB
Python
71 lines
2.1 KiB
Python
"""Simple frame recording helper for example scripts."""
|
|
|
|
from __future__ import annotations
|
|
|
|
from pathlib import Path
|
|
|
|
import cv2
|
|
|
|
from .render_2d import frame_to_bgr
|
|
|
|
|
|
class FrameRecorder:
|
|
"""Write camera frames to disk on demand (start/stop via keyboard hooks)."""
|
|
|
|
def __init__(self, save_path: str | Path = "./data/pulse_test.mp4", fps: int = 30) -> None:
|
|
self.save_path = Path(save_path)
|
|
self.fps = fps
|
|
self._writer: cv2.VideoWriter | None = None
|
|
self._is_recording = False
|
|
self._frame_count = 0
|
|
|
|
@property
|
|
def is_recording(self) -> bool:
|
|
return self._is_recording
|
|
|
|
def write_if_recording(self, frame) -> None:
|
|
if not self._is_recording or self._writer is None or frame is None:
|
|
return
|
|
self._writer.write(frame_to_bgr(frame))
|
|
self._frame_count += 1
|
|
|
|
def start(self, frame) -> bool:
|
|
if frame is None:
|
|
print("当前没有可用帧，无法确定录像尺寸。")
|
|
return False
|
|
|
|
self.save_path.parent.mkdir(parents=True, exist_ok=True)
|
|
bgr = frame_to_bgr(frame)
|
|
height, width = bgr.shape[:2]
|
|
writer = cv2.VideoWriter(
|
|
str(self.save_path),
|
|
cv2.VideoWriter_fourcc(*"mp4v"),
|
|
self.fps,
|
|
(width, height),
|
|
)
|
|
if not writer.isOpened():
|
|
print(f"无法创建录像文件：{self.save_path}")
|
|
return False
|
|
|
|
self._writer = writer
|
|
self._is_recording = True
|
|
self._frame_count = 0
|
|
print(f"开始录像：{self.save_path}")
|
|
return True
|
|
|
|
def stop(self) -> tuple[Path | None, int]:
|
|
self._is_recording = False
|
|
if self._writer is not None:
|
|
self._writer.release()
|
|
self._writer = None
|
|
|
|
path = self.save_path if self._frame_count else None
|
|
if path is not None:
|
|
print(f"录像结束：{path}，总帧数：{self._frame_count}")
|
|
else:
|
|
print(f"录像结束，总帧数：{self._frame_count}")
|
|
|
|
count = self._frame_count
|
|
self._frame_count = 0
|
|
return path, count
|