Fixing PlayHTTTSService to reuse the same context when needed.

src/pipecat/services/playht/tts.py

@@ -13,6 +13,7 @@ supporting both WebSocket streaming and HTTP-based synthesis.
 import io
 import json
 import struct
+import uuid
 import warnings
 from typing import AsyncGenerator, Optional
 
@@ -323,6 +324,20 @@ class PlayHTTTSService(InterruptibleTTSService):
             return self._websocket
         raise Exception("Websocket not connected")
 
+    def create_context_id(self) -> str:
+        """Generate a unique context ID for a TTS request in case we don't have one already in progress.
+
+        Returns:
+            A unique string identifier for the TTS context.
+        """
+        # If a context ID does not exist, create a new one.
+        # If an ID exists, continue using the current ID.
+        # When interruptions happen, user speech results in
+        # an interruption, which resets the context ID.
+        if not self._context_id:
+            return str(uuid.uuid4())
+        return self._context_id
+
     async def _handle_interruption(self, frame: InterruptionFrame, direction: FrameDirection):
         """Handle interruption by stopping metrics and clearing request ID."""
         await super()._handle_interruption(frame, direction)