Update app.py

app.py

@@ -35,6 +35,14 @@ vad_iterator = VADIterator(
     min_silence_duration_ms=300,
 )
 
+def pcm16_to_float32(pcm_data: bytes) -> np.ndarray:
+    """
+    Convert 16-bit PCM bytes into a float32 numpy array with values in [-1, 1].
+    """
+    int_data = np.frombuffer(pcm_data, dtype=np.int16)
+    float_data = int_data.astype(np.float32) / 32768.0
+    return float_data
+
 @app.websocket("/ws/transcribe")
 async def websocket_endpoint(websocket: WebSocket):
     await websocket.accept()