Send audio output as binary PCM instead of JSON

Author: oadultradeepfield

src/routing/outbound.py

@@ -42,13 +42,21 @@ async def _send_frame(
         ctx: "ConnectionContext",
         frame: OutboundFrame,
     ) -> None:
-        """Send a frame to the WebSocket as JSON.
+        """Send a frame to the WebSocket.
+
+        AUDIO frames are sent as binary PCM, all others as JSON.
 
         Args:
             ctx: The ConnectionContext
             frame: The OutboundFrame to send
         """
         try:
+            if frame.type == "AUDIO":
+                audio_data = frame.payload.get("data")
+                if isinstance(audio_data, bytes):
+                    await ctx.websocket.send_bytes(audio_data)
+                    return
+
             message = frame.model_dump(mode="json")
             await ctx.websocket.send_json(message)
         except (asyncio.CancelledError, RuntimeError):