Fixed bookmarking with audio books.

src/tts_engine.py

@@ -11,11 +11,24 @@ import subprocess
 import wave
 import io
 import struct
+import shutil
+
+from .text_validator import is_valid_text
 
 
 class TtsEngine:
     """Text-to-speech engine using piper-tts"""
 
+    @staticmethod
+    def is_available():
+        """
+        Check if piper-tts is available on the system
+
+        Returns:
+            bool: True if piper-tts is installed, False otherwise
+        """
+        return shutil.which('piper-tts') is not None
+
     def __init__(self, modelPath="/usr/share/piper-voices/en/en_US/hfc_male/medium/en_US-hfc_male-medium.onnx"):
         """
         Initialize TTS engine
@@ -41,7 +54,7 @@ class TtsEngine:
         Raises:
             RuntimeError: If piper-tts fails
         """
-        if not text.strip():
+        if not is_valid_text(text):
             return None
 
         # Safety: Limit text size to prevent excessive memory usage