112 lines
4.5 KiB
Python
112 lines
4.5 KiB
Python
"""SRT 转 ASS 节点入口。
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解析标准 SRT 后生成 ASS 文件，其中同一句字幕同时输出 LeftEye 与 RightEye
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两个样式，分别落在屏幕左右两半，形成 VR 双眼叠加效果。
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"""
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from __future__ import annotations
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import json
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from pathlib import Path
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from wov_sdk.models import InvokeRequest, InvokeResponse, NodeManifest
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from wov_sdk.server import run_node
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def _ass_header(resolution: str) -> str:
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"""生成 ASS 文件头：脚本信息、左右眼样式和事件格式。"""
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width, height = resolution.lower().split("x", 1)
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# 左眼样式占左半边，右眼样式占右半边，各留 50px 内边距。
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left_margin = 50
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right_margin = int(width) - 50
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return f"""[Script Info]
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Title: VR Dual-Eye Subtitle
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ScriptType: v4.00+
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Collisions: Normal
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PlayResX: {width}
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PlayResY: {height}
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WrapStyle: 1
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ScaledBorderAndShadow: yes
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[V4+ Styles]
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Format: Name,Fontname,Fontsize,PrimaryColour,SecondaryColour,OutlineColour,BackColour,Bold,Italic,Underline,StrikeOut,ScaleX,ScaleY,Spacing,Angle,BorderStyle,Outline,Shadow,Alignment,MarginL,MarginR,MarginV,Encoding
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Style: LeftEye,Arial,50,&H00FFFFFF,&H000000FF,&H00000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,2,{left_margin},{int(width) // 2},{int(height) // 2 + 60},1
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Style: RightEye,Arial,50,&H00FFFFFF,&H000000FF,&H00000000,&H80000000,0,0,0,0,50,100,0,0,1,4,0,2,{int(width) // 2},{right_margin},{int(height) // 2 + 60},1
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[Events]
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Format: Layer,Start,End,Style,Name,MarginL,MarginR,MarginV,Effect,Text
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"""
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def parse_srt(text: str) -> list[tuple[str, str, str]]:
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"""把 SRT 文本解析为 (开始时间, 结束时间, 文本) 条目列表。"""
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entries: list[tuple[str, str, str]] = []
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lines = text.splitlines()
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index = 0
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while index < len(lines):
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# 跳过序号前的空行，兼容文件开头有换行的情况。
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if not lines[index].strip():
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index += 1
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continue
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# 跳过序号行，直接读取下一行时间轴。
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index += 1
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if index >= len(lines):
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break
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time_line = lines[index].strip()
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index += 1
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# 时间轴必须包含分隔符，否则按畸形输入跳过。
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if " --> " not in time_line:
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continue
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# SRT 使用逗号毫秒，ASS 使用点号，需要转换。
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start, end = [part.replace(",", ".") for part in time_line.split(" --> ")]
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# 连续读取非空行作为字幕文本，多行用 ASS 换行符 \N 连接。
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text_lines: list[str] = []
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while index < len(lines) and lines[index].strip():
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text_lines.append(lines[index])
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index += 1
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entries.append((start, end, r"\N".join(text_lines)))
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index += 1
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return entries
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def write_ass(entries: list[tuple[str, str, str]], output_path: Path, resolution: str) -> None:
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"""把解析后的条目写入 ASS 文件，每个条目输出左右眼两行 Dialogue。"""
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lines = [_ass_header(resolution)]
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for start, end, text in entries:
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# an2 对齐到屏幕中央偏下，保证双眼字幕视线自然。
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lines.append(f"Dialogue: 0,{start},{end},LeftEye,,0,0,0,,{{\\an2}}{text}")
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lines.append(f"Dialogue: 0,{start},{end},RightEye,,0,0,0,,{{\\an2}}{text}")
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output_path.write_text("\n".join(lines) + "\n", encoding="utf-8")
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def invoke(request: InvokeRequest) -> InvokeResponse:
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"""把 cn_srt_uri 指向的 SRT 转为 dual_eye.ass 产物。"""
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srt_uri = request.inputs.get("cn_srt_uri")
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if not srt_uri:
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return InvokeResponse(status="failed", error="cn_srt_uri is required")
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srt_path = Path(srt_uri)
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if not srt_path.is_file():
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return InvokeResponse(status="failed", error="srt file not found")
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entries = parse_srt(srt_path.read_text(encoding="utf-8"))
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output_dir = Path(request.output_dir)
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output_dir.mkdir(parents=True, exist_ok=True)
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output_path = output_dir / "dual_eye.ass"
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# 分辨率默认 3840x1920，覆盖常见 VR 视频尺寸。
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resolution = str(request.params.get("resolution", "3840x1920"))
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write_ass(entries, output_path, resolution)
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return InvokeResponse(status="completed", outputs={"ass_uri": str(output_path)})
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def main() -> None:
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"""加载节点清单并以本模块的 invoke 处理器启动服务。"""
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manifest_path = Path(__file__).resolve().parent.parent / "node.manifest.json"
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with open(manifest_path, "r", encoding="utf-8") as f:
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manifest = NodeManifest.from_dict(json.load(f))
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run_node(manifest, invoke)
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if __name__ == "__main__":
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main()
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