Merge pull request #1191 from pipecat-ai/mb/azure-tts-error-handling

Improve AzureTTSService error handling

CHANGELOG.md

@@ -20,6 +20,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Improved error handling in `AzureTTSService` to properly detect and log
+  synthesis cancellation errors.
+
 - Enhanced `WhisperSTTService` with full language support and improved model
   documentation.
 

src/pipecat/services/azure.py

@@ -576,15 +576,19 @@ class AzureTTSService(AzureBaseTTSService):
     async def run_tts(self, text: str) -> AsyncGenerator[Frame, None]:
         logger.debug(f"Generating TTS: [{text}]")
 
+        try:
+            if self._speech_synthesizer is None:
+                error_msg = "Speech synthesizer not initialized."
+                logger.error(error_msg)
+                yield ErrorFrame(error_msg)
+                return
+
             try:
                 await self.start_ttfb_metrics()
                 yield TTSStartedFrame()
 
                 ssml = self._construct_ssml(text)
-
-            # Start synthesis
                 self._speech_synthesizer.speak_ssml_async(ssml)
-
                 await self.start_tts_usage_metrics(text)
 
                 # Stream audio chunks as they arrive
@@ -594,7 +598,6 @@ class AzureTTSService(AzureBaseTTSService):
                         break
 
                     await self.stop_ttfb_metrics()
-
                     yield TTSAudioRawFrame(
                         audio=chunk,
                         sample_rate=self.sample_rate,
@@ -604,8 +607,13 @@ class AzureTTSService(AzureBaseTTSService):
                 yield TTSStoppedFrame()
 
             except Exception as e:
-            logger.error(f"{self} error generating TTS: {e}")
-            yield ErrorFrame(f"{self} error: {str(e)}")
+                logger.error(f"{self} error during synthesis: {e}")
+                yield TTSStoppedFrame()
+                # Could add reconnection logic here if needed
+                return
+
+        except Exception as e:
+            logger.error(f"{self} exception: {e}")
 
 
 class AzureHttpTTSService(AzureBaseTTSService):