mirror of
https://github.com/JefferyHcool/BiliNote.git
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sunnyclubcnandClaude Opus 4.5
85b24dee40
## Subtitle Priority (Backend) - Add download_subtitles() method to base downloader - Implement Bilibili subtitle fetching with cookies support - Implement YouTube subtitle fetching - Support SRT and JSON3 format parsing - Prioritize platform subtitles over Whisper transcription ## Mindmap Export Enhancements (Frontend) - Add SVG vector export with proper viewBox handling - Add XMind format export with Chinese character encoding fix - Fix PNG/SVG export to capture full content by calling fit() before export - Add JSZip dependency for XMind export Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
317 lines
11 KiB
Python
317 lines
11 KiB
Python
import os
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import json
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import logging
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from abc import ABC
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from typing import Union, Optional, List
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from pathlib import Path
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import yt_dlp
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from app.downloaders.base import Downloader, DownloadQuality, QUALITY_MAP
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from app.models.notes_model import AudioDownloadResult
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from app.models.transcriber_model import TranscriptResult, TranscriptSegment
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from app.utils.path_helper import get_data_dir
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from app.utils.url_parser import extract_video_id
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logger = logging.getLogger(__name__)
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# B站 cookies 文件路径
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BILIBILI_COOKIES_FILE = os.getenv("BILIBILI_COOKIES_FILE", "cookies.txt")
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class BilibiliDownloader(Downloader, ABC):
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def __init__(self):
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super().__init__()
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def download(
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self,
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video_url: str,
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output_dir: Union[str, None] = None,
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quality: DownloadQuality = "fast",
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need_video:Optional[bool]=False
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) -> AudioDownloadResult:
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if output_dir is None:
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output_dir = get_data_dir()
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if not output_dir:
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output_dir=self.cache_data
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os.makedirs(output_dir, exist_ok=True)
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output_path = os.path.join(output_dir, "%(id)s.%(ext)s")
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ydl_opts = {
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'format': 'bestaudio[ext=m4a]/bestaudio/best',
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'outtmpl': output_path,
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'postprocessors': [
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{
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'key': 'FFmpegExtractAudio',
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'preferredcodec': 'mp3',
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'preferredquality': '64',
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}
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],
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'noplaylist': True,
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'quiet': False,
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}
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with yt_dlp.YoutubeDL(ydl_opts) as ydl:
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info = ydl.extract_info(video_url, download=True)
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video_id = info.get("id")
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title = info.get("title")
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duration = info.get("duration", 0)
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cover_url = info.get("thumbnail")
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audio_path = os.path.join(output_dir, f"{video_id}.mp3")
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return AudioDownloadResult(
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file_path=audio_path,
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title=title,
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duration=duration,
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cover_url=cover_url,
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platform="bilibili",
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video_id=video_id,
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raw_info=info,
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video_path=None # ❗音频下载不包含视频路径
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)
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def download_video(
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self,
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video_url: str,
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output_dir: Union[str, None] = None,
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) -> str:
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"""
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下载视频，返回视频文件路径
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"""
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if output_dir is None:
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output_dir = get_data_dir()
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os.makedirs(output_dir, exist_ok=True)
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print("video_url",video_url)
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video_id=extract_video_id(video_url, "bilibili")
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video_path = os.path.join(output_dir, f"{video_id}.mp4")
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if os.path.exists(video_path):
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return video_path
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# 检查是否已经存在
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output_path = os.path.join(output_dir, "%(id)s.%(ext)s")
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ydl_opts = {
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'format': 'bv*[ext=mp4]/bestvideo+bestaudio/best',
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'outtmpl': output_path,
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'noplaylist': True,
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'quiet': False,
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'merge_output_format': 'mp4', # 确保合并成 mp4
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}
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with yt_dlp.YoutubeDL(ydl_opts) as ydl:
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info = ydl.extract_info(video_url, download=True)
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video_id = info.get("id")
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video_path = os.path.join(output_dir, f"{video_id}.mp4")
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if not os.path.exists(video_path):
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raise FileNotFoundError(f"视频文件未找到: {video_path}")
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return video_path
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def delete_video(self, video_path: str) -> str:
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"""
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删除视频文件
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"""
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if os.path.exists(video_path):
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os.remove(video_path)
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return f"视频文件已删除: {video_path}"
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else:
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return f"视频文件未找到: {video_path}"
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def download_subtitles(self, video_url: str, output_dir: str = None,
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langs: List[str] = None) -> Optional[TranscriptResult]:
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"""
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尝试获取B站视频字幕
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:param video_url: 视频链接
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:param output_dir: 输出路径
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:param langs: 优先语言列表
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:return: TranscriptResult 或 None
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"""
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if output_dir is None:
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output_dir = get_data_dir()
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if not output_dir:
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output_dir = self.cache_data
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os.makedirs(output_dir, exist_ok=True)
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if langs is None:
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langs = ['zh-Hans', 'zh', 'zh-CN', 'ai-zh', 'en', 'en-US']
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video_id = extract_video_id(video_url, "bilibili")
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ydl_opts = {
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'writesubtitles': True,
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'writeautomaticsub': True,
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'subtitleslangs': langs,
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'subtitlesformat': 'srt/json3/best', # 支持多种格式
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'skip_download': True,
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'outtmpl': os.path.join(output_dir, f'{video_id}.%(ext)s'),
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'quiet': True,
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}
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# 添加 cookies 支持
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cookies_path = Path(BILIBILI_COOKIES_FILE)
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if not cookies_path.is_absolute():
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# 相对于 backend 目录
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cookies_path = Path(__file__).parent.parent.parent / BILIBILI_COOKIES_FILE
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if cookies_path.exists():
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ydl_opts['cookiefile'] = str(cookies_path)
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logger.info(f"使用 cookies 文件: {cookies_path}")
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else:
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logger.warning(f"B站 cookies 文件不存在: {cookies_path}，字幕获取可能失败")
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try:
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with yt_dlp.YoutubeDL(ydl_opts) as ydl:
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info = ydl.extract_info(video_url, download=True)
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# 查找下载的字幕文件
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subtitles = info.get('requested_subtitles') or {}
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if not subtitles:
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logger.info(f"B站视频 {video_id} 没有可用字幕")
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return None
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# 按优先级查找字幕
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detected_lang = None
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sub_info = None
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for lang in langs:
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if lang in subtitles:
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detected_lang = lang
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sub_info = subtitles[lang]
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break
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# 如果按优先级没找到，取第一个可用的（排除弹幕）
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if not detected_lang:
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for lang, info_item in subtitles.items():
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if lang != 'danmaku': # 排除弹幕
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detected_lang = lang
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sub_info = info_item
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break
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if not sub_info:
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logger.info(f"B站视频 {video_id} 没有可用字幕（排除弹幕）")
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return None
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# 检查是否有内嵌数据（yt-dlp 有时直接返回字幕内容）
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if 'data' in sub_info and sub_info['data']:
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logger.info(f"直接从返回数据解析字幕: {detected_lang}")
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return self._parse_srt_content(sub_info['data'], detected_lang)
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# 查找字幕文件
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ext = sub_info.get('ext', 'srt')
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subtitle_file = os.path.join(output_dir, f"{video_id}.{detected_lang}.{ext}")
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if not os.path.exists(subtitle_file):
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logger.info(f"字幕文件不存在: {subtitle_file}")
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return None
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# 根据格式解析字幕文件
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if ext == 'json3':
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return self._parse_json3_subtitle(subtitle_file, detected_lang)
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else:
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with open(subtitle_file, 'r', encoding='utf-8') as f:
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return self._parse_srt_content(f.read(), detected_lang)
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except Exception as e:
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logger.warning(f"获取B站字幕失败: {e}")
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return None
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def _parse_srt_content(self, srt_content: str, language: str) -> Optional[TranscriptResult]:
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"""
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解析 SRT 格式字幕内容
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:param srt_content: SRT 字幕文本内容
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:param language: 语言代码
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:return: TranscriptResult
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"""
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import re
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try:
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segments = []
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# SRT 格式: 序号\n时间戳\n文本\n\n
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pattern = r'(\d+)\n(\d{2}:\d{2}:\d{2},\d{3})\s*-->\s*(\d{2}:\d{2}:\d{2},\d{3})\n(.*?)(?=\n\n|\n\d+\n|$)'
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matches = re.findall(pattern, srt_content, re.DOTALL)
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for match in matches:
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idx, start_time, end_time, text = match
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text = text.strip()
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if not text:
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continue
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# 转换时间格式 00:00:00,000 -> 秒
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def time_to_seconds(t):
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parts = t.replace(',', '.').split(':')
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return float(parts[0]) * 3600 + float(parts[1]) * 60 + float(parts[2])
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segments.append(TranscriptSegment(
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start=time_to_seconds(start_time),
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end=time_to_seconds(end_time),
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text=text
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))
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if not segments:
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return None
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full_text = ' '.join(seg.text for seg in segments)
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logger.info(f"成功解析B站SRT字幕，共 {len(segments)} 段")
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return TranscriptResult(
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language=language,
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full_text=full_text,
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segments=segments,
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raw={'source': 'bilibili_subtitle', 'format': 'srt'}
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)
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except Exception as e:
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logger.warning(f"解析SRT字幕失败: {e}")
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return None
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def _parse_json3_subtitle(self, subtitle_file: str, language: str) -> Optional[TranscriptResult]:
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"""
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解析 json3 格式字幕文件
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:param subtitle_file: 字幕文件路径
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:param language: 语言代码
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:return: TranscriptResult
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"""
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try:
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with open(subtitle_file, 'r', encoding='utf-8') as f:
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data = json.load(f)
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segments = []
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events = data.get('events', [])
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for event in events:
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# json3 格式中时间单位是毫秒
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start_ms = event.get('tStartMs', 0)
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duration_ms = event.get('dDurationMs', 0)
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# 提取文本
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segs = event.get('segs', [])
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text = ''.join(seg.get('utf8', '') for seg in segs).strip()
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if text: # 只添加非空文本
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segments.append(TranscriptSegment(
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start=start_ms / 1000.0,
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end=(start_ms + duration_ms) / 1000.0,
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text=text
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))
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if not segments:
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return None
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full_text = ' '.join(seg.text for seg in segments)
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logger.info(f"成功解析B站字幕，共 {len(segments)} 段")
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return TranscriptResult(
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language=language,
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full_text=full_text,
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segments=segments,
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raw={'source': 'bilibili_subtitle', 'file': subtitle_file}
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)
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except Exception as e:
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logger.warning(f"解析字幕文件失败: {e}")
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return None |