examples(twilio-chatbot): create sample rate variable

examples/twilio-chatbot/bot.py

@@ -36,6 +36,8 @@ load_dotenv(override=True)
 logger.remove(0)
 logger.add(sys.stderr, level="DEBUG")
 
+SAMPLE_RATE = 8000
+
 
 async def save_audio(server_name: str, audio: bytes, sample_rate: int, num_channels: int):
     if len(audio) > 0:
@@ -61,13 +63,13 @@ async def run_bot(websocket_client: WebSocket, stream_sid: str, testing: bool):
         params=FastAPIWebsocketParams(
             audio_in_enabled=True,
             audio_out_enabled=True,
-            audio_out_sample_rate=8000,
+            audio_out_sample_rate=SAMPLE_RATE,
             add_wav_header=False,
             vad_enabled=True,
-            vad_analyzer=SileroVADAnalyzer(sample_rate=8000),
+            vad_analyzer=SileroVADAnalyzer(sample_rate=SAMPLE_RATE),
             vad_audio_passthrough=True,
             serializer=TwilioFrameSerializer(
-                stream_sid, TwilioFrameSerializer.InputParams(sample_rate=8000)
+                stream_sid, TwilioFrameSerializer.InputParams(sample_rate=SAMPLE_RATE)
             ),
         ),
     )
@@ -76,14 +78,14 @@ async def run_bot(websocket_client: WebSocket, stream_sid: str, testing: bool):
 
     stt = DeepgramSTTService(
         api_key=os.getenv("DEEPGRAM_API_KEY"),
-        live_options=LiveOptions(sample_rate=8000),
+        live_options=LiveOptions(sample_rate=SAMPLE_RATE),
         audio_passthrough=True,
     )
 
     tts = CartesiaTTSService(
         api_key=os.getenv("CARTESIA_API_KEY"),
         voice_id="79a125e8-cd45-4c13-8a67-188112f4dd22",  # British Lady
-        sample_rate=8000,
+        sample_rate=SAMPLE_RATE,
         push_silence_after_stop=testing,
     )
 
@@ -99,7 +101,7 @@ async def run_bot(websocket_client: WebSocket, stream_sid: str, testing: bool):
 
     # NOTE: Watch out! This will save all the conversation in memory. You can
     # pass `buffer_size` to get periodic callbacks.
-    audiobuffer = AudioBufferProcessor(sample_rate=8000)
+    audiobuffer = AudioBufferProcessor(sample_rate=SAMPLE_RATE)
 
     pipeline = Pipeline(
         [