init

services/vad.py

@@ -0,0 +1,41 @@
+from __future__ import annotations
+
+from typing import Optional
+
+
+class VADService:
+    def __init__(self) -> None:
+        self._model = None
+        self._iterator = None
+        self._ready = False
+        self._attempted = False
+        self._error: Optional[str] = None
+
+    def _ensure_loaded(self) -> None:
+        if self._ready or self._attempted:
+            return
+        self._attempted = True
+        try:
+            from silero_vad import VADIterator, load_silero_vad
+
+            self._model = load_silero_vad()
+            self._iterator = VADIterator(
+                self._model,
+                threshold=0.5,
+                sampling_rate=16000,
+                min_silence_duration_ms=300,
+                speech_pad_ms=30,
+            )
+            self._ready = True
+        except Exception as exc:  # pragma: no cover
+            self._error = str(exc)
+
+    def push_chunk(self, pcm_chunk):
+        self._ensure_loaded()
+        if self._ready and self._iterator is not None:
+            return self._iterator(pcm_chunk)
+        return None
+
+    @property
+    def health(self) -> dict:
+        return {"ready": self._ready, "attempted": self._attempted, "error": self._error}