feat(microphone): PollMonitor mit Geräteerkennung (TDD)

whisper_local/microphone/_poll.py

@@ -0,0 +1,56 @@
+# whisper_local/microphone/_poll.py
+"""Polling-basierter Mikrofon-Monitor (cross-platform)."""
+import asyncio
+import logging
+from collections.abc import Awaitable, Callable
+
+import sounddevice as sd
+
+logger = logging.getLogger(__name__)
+
+
+class PollMonitor:
+    def __init__(self, configured_device: str | None, interval: float = 2.5):
+        self.configured_device = configured_device
+        self.interval = interval
+        self.on_device_added: Callable[[str], Awaitable[None]] | None = None
+        self.on_device_removed: Callable[[str], Awaitable[None]] | None = None
+        self.on_configured_missing: Callable[[], Awaitable[None]] | None = None
+        self._task: asyncio.Task | None = None
+        self._known_devices: set[str] = set()
+
+    def _current_devices(self) -> set[str]:
+        try:
+            return {
+                dev["name"]
+                for dev in sd.query_devices()
+                if dev["max_input_channels"] > 0
+            }
+        except Exception:
+            logger.exception("Fehler beim Abfragen der Audiogeräte")
+            return self._known_devices.copy()
+
+    async def start(self) -> None:
+        self._known_devices = self._current_devices()
+        self._task = asyncio.create_task(self._loop())
+
+    def stop(self) -> None:
+        if self._task is not None:
+            self._task.cancel()
+            self._task = None
+
+    async def _loop(self) -> None:
+        while True:
+            await asyncio.sleep(self.interval)
+            current = self._current_devices()
+            added = current - self._known_devices
+            removed = self._known_devices - current
+            self._known_devices = current
+
+            for name in added:
+                if self.on_device_added:
+                    await self.on_device_added(name)
+
+            for name in removed:
+                if self.on_device_removed:
+                    await self.on_device_removed(name)