76 lines
2.9 KiB
Python
76 lines
2.9 KiB
Python
"""Read finalized demonstration tracks without touching active recorders."""
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import json
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from pathlib import Path
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import tempfile
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from artemis.utils.video import VideoRecordingResult, render_timeline_clip
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class SavedVideoSource:
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def __init__(self, root: Path, track: dict):
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self.root = root.resolve()
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self.track = track
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self.segments = []
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for segment in track["segments"]:
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path = (self.root / segment["file"]).resolve()
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if not path.is_relative_to(self.root) or not path.is_file():
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raise ValueError("示范录像文件不存在或不属于当前任务")
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start = float(segment["offset_ms"]) / 1000
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end = start + float(segment["duration_ms"]) / 1000
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if end > start:
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self.segments.append({"path": path, "start": start, "end": end})
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if not self.segments:
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raise ValueError("示范录像没有可分析的片段")
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self.start = min(s["start"] for s in self.segments)
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self.end = max(s["end"] for s in self.segments)
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async def extract_segment_metadata(
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self, start: float, end: float | None = None
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) -> VideoRecordingResult:
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start, end = max(start, self.start), min(end if end is not None else self.end, self.end)
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if end <= start:
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return VideoRecordingResult(success=False, message="所选区间没有示范录像")
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# Analyzer owns only these disposable copies, never the source evidence.
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folder = Path(tempfile.mkdtemp(prefix="artemis-demo-analysis-"))
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path = folder / "clip.mp4"
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landscape = self.track["kind"] == "computer"
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ok = False
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try:
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ok = await render_timeline_clip(
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self.segments,
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start,
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end,
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path,
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canvas_width=1280 if landscape else 720,
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canvas_height=720 if landscape else 1280,
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)
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finally:
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if not ok:
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path.unlink(missing_ok=True)
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folder.rmdir()
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if not ok:
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return VideoRecordingResult(success=False, message="示范录像片段读取失败")
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return VideoRecordingResult(
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success=True,
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message="已读取保存的示范录像",
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video_path=path,
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duration_seconds=end - start,
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actual_start_relative_time=start,
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source_revision=self.track["id"],
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file_size_mb=path.stat().st_size / 1024 / 1024,
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)
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def android_track(root: Path, folder: Path, demo_id: str) -> dict:
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manifest = json.loads((folder / "recording.json").read_text(encoding="utf-8"))
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return {
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"id": f"{demo_id}-android",
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"kind": "android",
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"label": "安卓人工示范",
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"segments": [
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{**item, "file": (folder / item["file"]).relative_to(root).as_posix()}
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for item in manifest["segments"]
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],
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}
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