configurable deepgram base url

src/pipecat/services/deepgram.py

@@ -22,12 +22,14 @@ class DeepgramTTSService(TTSService):
             aiohttp_session: aiohttp.ClientSession,
             api_key: str,
             voice: str = "aura-helios-en",
+            base_url: str = "https://api.deepgram.com/v1/speak",
             **kwargs):
         super().__init__(**kwargs)
 
         self._voice = voice
         self._api_key = api_key
         self._aiohttp_session = aiohttp_session
+        self._base_url = base_url
 
     def can_generate_metrics(self) -> bool:
         return True
@@ -35,7 +37,7 @@ class DeepgramTTSService(TTSService):
     async def run_tts(self, text: str) -> AsyncGenerator[Frame, None]:
         logger.debug(f"Generating TTS: [{text}]")
 
-        base_url = "https://api.deepgram.com/v1/speak"
+        base_url = self._base_url
         request_url = f"{base_url}?model={self._voice}&encoding=linear16&container=none&sample_rate=16000"
         headers = {"authorization": f"token {self._api_key}"}
         body = {"text": text}