Move tracing fields to AIService and extract _get_turn_context helper

Consolidate _tracing_enabled and _tracing_context from LLMService,
STTService, and TTSService into the shared AIService base class.
Extract _get_turn_context() helper in service_decorators.py to
encapsulate the repeated pattern across all traced decorators.

src/pipecat/services/ai_service.py

@@ -44,6 +44,8 @@ class AIService(FrameProcessor):
         self._model_name: str = ""
         self._settings: Dict[str, Any] = {}
         self._session_properties: Dict[str, Any] = {}
+        self._tracing_enabled: bool = False
+        self._tracing_context = None
 
     @property
     def model_name(self) -> str:
@@ -72,7 +74,8 @@ class AIService(FrameProcessor):
         Args:
             frame: The start frame containing initialization parameters.
         """
-        pass
+        self._tracing_enabled = frame.enable_tracing
+        self._tracing_context = frame.tracing_context
 
     async def stop(self, frame: EndFrame):
         """Stop the AI service.

src/pipecat/services/llm_service.py

@@ -198,7 +198,6 @@ class LLMService(UserTurnCompletionLLMServiceMixin, AIService):
         self._functions: Dict[Optional[str], FunctionCallRegistryItem] = {}
         self._function_call_tasks: Dict[Optional[asyncio.Task], FunctionCallRunnerItem] = {}
         self._sequential_runner_task: Optional[asyncio.Task] = None
-        self._tracing_enabled: bool = False
         self._skip_tts: Optional[bool] = None
         self._summary_task: Optional[asyncio.Task] = None
 
@@ -285,8 +284,6 @@ class LLMService(UserTurnCompletionLLMServiceMixin, AIService):
         await super().start(frame)
         if not self._run_in_parallel:
             await self._create_sequential_runner_task()
-        self._tracing_enabled = frame.enable_tracing
-        self._tracing_context = frame.tracing_context
 
     async def stop(self, frame: EndFrame):
         """Stop the LLM service.

src/pipecat/services/stt_service.py

@@ -102,7 +102,6 @@ class STTService(AIService):
         self._init_sample_rate = sample_rate
         self._sample_rate = 0
         self._settings: Dict[str, Any] = {}
-        self._tracing_enabled: bool = False
         self._muted: bool = False
         self._user_id: str = ""
         self._ttfs_p99_latency = ttfs_p99_latency
@@ -202,8 +201,6 @@ class STTService(AIService):
         """
         await super().start(frame)
         self._sample_rate = self._init_sample_rate or frame.audio_in_sample_rate
-        self._tracing_enabled = frame.enable_tracing
-        self._tracing_context = frame.tracing_context
 
     async def cleanup(self):
         """Clean up STT service resources."""

src/pipecat/services/tts_service.py

@@ -208,8 +208,6 @@ class TTSService(AIService):
         # TODO: Deprecate _text_filters when added to LLMTextProcessor
         self._text_filters: Sequence[BaseTextFilter] = text_filters or []
         self._transport_destination: Optional[str] = transport_destination
-        self._tracing_enabled: bool = False
-
         if text_filter:
             import warnings
 
@@ -349,8 +347,6 @@ class TTSService(AIService):
         self._sample_rate = self._init_sample_rate or frame.audio_out_sample_rate
         if self._push_stop_frames and not self._stop_frame_task:
             self._stop_frame_task = self.create_task(self._stop_frame_handler())
-        self._tracing_enabled = frame.enable_tracing
-        self._tracing_context = frame.tracing_context
 
     async def stop(self, frame: EndFrame):
         """Stop the TTS service.

src/pipecat/utils/tracing/service_decorators.py

@@ -54,6 +54,19 @@ def _noop_decorator(func):
     return func
 
 
+def _get_turn_context(self):
+    """Get the current turn's tracing context if available.
+
+    Args:
+        self: The service instance.
+
+    Returns:
+        The turn context, or None if unavailable.
+    """
+    tracing_ctx = getattr(self, "_tracing_context", None)
+    return tracing_ctx.get_turn_context() if tracing_ctx else None
+
+
 def _get_parent_service_context(self):
     """Get the parent service span context (internal use only).
 
@@ -182,9 +195,7 @@ def traced_tts(func: Optional[Callable] = None, *, name: Optional[str] = None) -
             span_name = "tts"
 
             # Get parent context
-            tracing_ctx = getattr(self, "_tracing_context", None)
+            parent_context = _get_turn_context(self) or _get_parent_service_context(self)
-            turn_context = tracing_ctx.get_turn_context() if tracing_ctx else None
-            parent_context = turn_context or _get_parent_service_context(self)
 
             # Create span
             tracer = trace.get_tracer("pipecat")
@@ -290,9 +301,7 @@ def traced_stt(func: Optional[Callable] = None, *, name: Optional[str] = None) -
                 span_name = "stt"
 
                 # Get the turn context first, then fall back to service context
-                tracing_ctx = getattr(self, "_tracing_context", None)
+                parent_context = _get_turn_context(self) or _get_parent_service_context(self)
-                turn_context = tracing_ctx.get_turn_context() if tracing_ctx else None
-                parent_context = turn_context or _get_parent_service_context(self)
 
                 # Create a new span as child of the turn span or service span
                 tracer = trace.get_tracer("pipecat")
@@ -373,9 +382,7 @@ def traced_llm(func: Optional[Callable] = None, *, name: Optional[str] = None) -
                 span_name = "llm"
 
                 # Get the parent context - turn context if available, otherwise service context
-                tracing_ctx = getattr(self, "_tracing_context", None)
+                parent_context = _get_turn_context(self) or _get_parent_service_context(self)
-                turn_context = tracing_ctx.get_turn_context() if tracing_ctx else None
-                parent_context = turn_context or _get_parent_service_context(self)
 
                 # Create a new span as child of the turn span or service span
                 tracer = trace.get_tracer("pipecat")
@@ -584,9 +591,7 @@ def traced_gemini_live(operation: str) -> Callable:
                 span_name = f"{operation}"
 
                 # Get the parent context - turn context if available, otherwise service context
-                tracing_ctx = getattr(self, "_tracing_context", None)
+                parent_context = _get_turn_context(self) or _get_parent_service_context(self)
-                turn_context = tracing_ctx.get_turn_context() if tracing_ctx else None
-                parent_context = turn_context or _get_parent_service_context(self)
 
                 # Create a new span as child of the turn span or service span
                 tracer = trace.get_tracer("pipecat")
@@ -892,9 +897,7 @@ def traced_openai_realtime(operation: str) -> Callable:
                 span_name = f"{operation}"
 
                 # Get the parent context - turn context if available, otherwise service context
-                tracing_ctx = getattr(self, "_tracing_context", None)
+                parent_context = _get_turn_context(self) or _get_parent_service_context(self)
-                turn_context = tracing_ctx.get_turn_context() if tracing_ctx else None
-                parent_context = turn_context or _get_parent_service_context(self)
 
                 # Create a new span as child of the turn span or service span
                 tracer = trace.get_tracer("pipecat")