默认 local,零行为变化。opt-in 双因素:transcription_backend=openai 且 openai_api_key 都齐才生效;任一缺失静默回退 local + stderr 一行警告。 首次进入云路径会 stderr 警告"语音将上传至 OpenAI 服务器"。 新增 config.json 字段: - transcription_backend: "local" (默认) | "openai" - local_whisper_model: "base" (替换 mcp_server.py 里硬编码 DEFAULT_WHISPER_MODEL) - openai_api_key: "" (默认空;openai 包为 optional,按需 pip install) 关键技术选择: - _transcribe(wav, backend) 单一 if/else 分发,不引入插件/工厂层 (Rule of Three —— 只有一个云后端时不值得抽象) - 文件 > 25MB 在 OpenAI() 实例化之前提前拒绝,避免无谓上传 - 错误分类清晰: 缺 key / 缺 openai 包 / 401 / 429 / APIError 各自的提示 - PR #58 缓存 schema 自然扩展: 条目加 backend 字段,命中需 backend+model_size 都匹配 - 旧条目缺 backend 字段视为 "local",向前兼容 PR #58 已落盘的所有数据 - transcribe_chat.py 批量 CLI 与 MCP 工具共享同一份配置,保持一致 新增 2 个测试 (tests/test_openai_backend.py),只覆盖回归风险最高的两条: - 文件 > 25MB 必须在 SDK 实例化前拒绝(隐私契约的防线) - backend 不匹配的旧条目不命中(避免切后端时返回错后端结果) 其余路径要么琐碎(默认值读取)、要么坏掉时声音很大(SDK 错误、ImportError), 要么已被 PR #58 现有测试隐式覆盖(缺 backend 字段的旧条目),不再单独写测试。 顺手把 README 里 PR #53 漏掉的 voice 三件套(get_voice_messages / decode_voice / transcribe_voice)补进 MCP 工具表,并新增"⚠️ 语音转录隐私" 章节说清数据流向、成本(约 \$0.006/分钟)、25MB 上限、回退行为。 Closes ylytdeng/wechat-decrypt#59
109 lines
3.9 KiB
Python
109 lines
3.9 KiB
Python
"""
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为聊天导出 JSON 中的语音消息补齐转录文本。
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用法:
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.venv/bin/python3 transcribe_chat.py <input.json> [output.json]
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参数:
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<input.json> 由 export_chat.py 产出的 JSON。
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[output.json] 可选输出路径,默认 "<input>_transcribed.json"。
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完整流程示例:
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.venv/bin/python3 export_chat.py <chat_name> /tmp/chat.json
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.venv/bin/python3 transcribe_chat.py /tmp/chat.json /tmp/chat_transcribed.json
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行为说明:
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- 后端由 config.json 中 transcription_backend 字段控制 (local/openai),
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与 MCP transcribe_voice 工具共享配置。详见 README "语音转录隐私" 章节。
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- 默认 local: 使用本地 Whisper (CPU,单线程),首次运行下载 ~145 MB 权重。
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- 切到 openai: 语音上传至 OpenAI 服务器转录 (~$0.006/分钟)。
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- 幂等: 已有 "transcription" 字段的消息会被跳过,因此崩溃/中断后可安全重跑。
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- 崩溃安全: 每处理完一条即整体重写输出 JSON,进程中断最多丢失当前一条。
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需要 WeChat DB 仍然在线/已解密 —— 语音 blob 是从 DB 现场按 local_id 读取的,
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不从 JSON 读。
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"""
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import json
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import os
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import sys
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from datetime import datetime
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import mcp_server
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def _transcribe_local_id(username, local_id, backend):
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row = mcp_server._fetch_voice_row(username, local_id)
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if row is None:
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return "[not found]"
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voice_data, create_time = row
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try:
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wav_path, _ = mcp_server._silk_to_wav(voice_data, create_time, username, local_id)
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except Exception as e:
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return f"[decode error: {e}]"
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try:
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result = mcp_server._transcribe(wav_path, backend)
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return result["text"]
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except Exception as e:
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return f"[transcribe error: {e}]"
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def transcribe_export(input_path, output_path):
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with open(input_path, encoding="utf-8") as f:
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data = json.load(f)
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# 优先使用导出 JSON 中已记录的 username,避免重新模糊匹配导致同名联系人漂移。
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username = data.get("username")
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chat_name = data.get("chat", "")
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if not username:
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username = mcp_server.resolve_username(chat_name)
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if not username:
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print(f"Could not resolve username for: {chat_name}")
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sys.exit(1)
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messages = data["messages"]
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# Compact format: type is absent for text; transcription is only present when filled.
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pending = [m for m in messages if m.get("type") == "voice" and not m.get("transcription")]
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total = len(pending)
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if total == 0:
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print("No voice messages to transcribe.")
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return
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backend = mcp_server._resolve_active_backend()
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print(f"Found {total} voice messages to transcribe.")
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print(f"Backend: {backend}")
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if backend == "local":
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print("Loading Whisper model (first run downloads ~145MB)...")
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mcp_server._get_whisper_model()
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print("Model ready.\n")
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else:
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print("")
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for i, msg in enumerate(pending, 1):
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local_id = msg["local_id"]
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ts = msg["timestamp"]
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ts_str = datetime.fromtimestamp(ts).strftime("%Y-%m-%d %H:%M:%S") if isinstance(ts, (int, float)) else ts
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print(f"[{i}/{total}] local_id={local_id} ({ts_str}) ... ", end="", flush=True)
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result = _transcribe_local_id(username, local_id, backend)
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msg["transcription"] = result
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print(repr(result[:60]) if result else '""')
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# Save after each transcription so progress isn't lost on crash
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with open(output_path, "w", encoding="utf-8") as f:
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json.dump(data, f, ensure_ascii=False, indent=2)
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print(f"\nDone. Written to {output_path}")
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if __name__ == "__main__":
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if len(sys.argv) < 2:
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print("Usage: python3 transcribe_chat.py <input.json> [output.json]")
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sys.exit(1)
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inp = sys.argv[1]
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base, ext = os.path.splitext(inp)
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out = sys.argv[2] if len(sys.argv) > 2 else f"{base}_transcribed{ext}"
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transcribe_export(inp, out)
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