docs: add changelog entry for pause_frame_processing parameter

Add pause_frame_processing parameter to CartesiaTTSService constructor
to allow users to disable frame processing pausing during TTS generation.

This is useful for use cases where text aggregation is disabled and
users want to send text directly to the TTS service without pausing
incoming frame processing.

CHANGELOG.md

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Added `pause_frame_processing` parameter to `CartesiaTTSService` to allow
+  disabling frame processing pausing during TTS generation.
+
 - Added `wait_for_all` argument to the base `LLMService`. When enabled, this
   ensures all function calls complete before returning results to the LLM (i.e.,
   before running a new inference with those results).

src/pipecat/services/cartesia/tts.py

@@ -234,6 +234,7 @@ class CartesiaTTSService(AudioContextWordTTSService):
         params: Optional[InputParams] = None,
         text_aggregator: Optional[BaseTextAggregator] = None,
         aggregate_sentences: Optional[bool] = True,
+        pause_frame_processing: Optional[bool] = True,
         **kwargs,
     ):
         """Initialize the Cartesia TTS service.
@@ -254,6 +255,7 @@ class CartesiaTTSService(AudioContextWordTTSService):
                     Use an LLMTextProcessor before the TTSService for custom text aggregation.
 
             aggregate_sentences: Whether to aggregate sentences within the TTSService.
+            pause_frame_processing: Whether to pause processing frames while receiving audio.
             **kwargs: Additional arguments passed to the parent service.
         """
         # Aggregating sentences still gives cleaner-sounding results and fewer
@@ -269,7 +271,7 @@ class CartesiaTTSService(AudioContextWordTTSService):
         super().__init__(
             aggregate_sentences=aggregate_sentences,
             push_text_frames=False,
-            pause_frame_processing=True,
+            pause_frame_processing=pause_frame_processing,
             sample_rate=sample_rate,
             text_aggregator=text_aggregator,
             **kwargs,