Working on refactor

wyoming_satellite/vad.py

@@ -0,0 +1,33 @@
+"""Voice activity detection."""
+from typing import Optional
+
+
+class SileroVad:
+    """Voice activity detection with silero VAD."""
+
+    def __init__(self, threshold: float, trigger_level: int) -> None:
+        from pysilero_vad import SileroVoiceActivityDetector
+
+        self.detector = SileroVoiceActivityDetector()
+        self.threshold = threshold
+        self.trigger_level = trigger_level
+        self._activation = 0
+
+    def __call__(self, audio_bytes: Optional[bytes]) -> bool:
+        if audio_bytes is None:
+            # Reset
+            self._activation = 0
+            self.detector.reset()
+            return False
+
+        if self.detector(audio_bytes) >= self.threshold:
+            # Speech detected
+            self._activation += 1
+            if self._activation >= self.trigger_level:
+                self._activation = 0
+                return True
+        else:
+            # Silence detected
+            self._activation = max(0, self._activation - 1)
+
+        return False