feat: initial discord meeting bot

voice.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Callable
+
+from discord.ext import voice_recv
+
+
+class MeetingRecorder:
+    """Wrapper around discord-ext-voice-recv's listen/stop_listening API."""
+
+    def __init__(self, voice_client: voice_recv.VoiceRecvClient, output_path: str):
+        self.vc = voice_client
+        self.output_path = output_path
+        self.recording = False
+        self.sink: voice_recv.WaveSink | None = None
+
+    async def start(self, after_callback: Callable[[Exception | None], None]) -> None:
+        if self.vc.is_listening():
+            raise RuntimeError("Voice client is already listening")
+
+        Path(self.output_path).parent.mkdir(parents=True, exist_ok=True)
+        self.sink = voice_recv.WaveSink(self.output_path)
+        self.vc.listen(self.sink, after=after_callback)
+        self.recording = True
+
+    async def stop(self) -> None:
+        if not self.recording:
+            return
+
+        if self.vc.is_listening():
+            self.vc.stop_listening()
+        self.recording = False