Ignore errors in tts callbacks

src/calibre/gui2/tts/linux.py

@@ -88,7 +88,11 @@ class Client:
             self.update_status(callback_type, index_mark)
             event = self.msg_as_event(callback_type, index_mark)
             if event is not None:
+                try:
                     callback(event)
+                except Exception:
+                    import traceback
+                    traceback.print_exc()
 
         def cw(callback_type, index_mark=None):
             self.dispatch_on_main_thread(partial(callback_wrapper, callback_type, index_mark))

src/calibre/gui2/tts/macos.py

@@ -32,7 +32,11 @@ class Client:
         else:
             return
         if self.current_callback is not None:
+            try:
                 self.current_callback(event)
+            except Exception:
+                import traceback
+                traceback.print_exc()
 
     def speak_simple_text(self, text):
         self.current_callback = None

src/calibre/gui2/tts/windows.py

@@ -26,6 +26,7 @@ class Client:
         self.current_stream_number = None
         self.current_callback = None
         self.dispatch_on_main_thread = dispatch_on_main_thread
+        self.status = {'synthesizing': False, 'paused': False}
 
     def __del__(self):
         if self.sp_voice is not None:
@@ -50,12 +51,18 @@ class Client:
                 event = Event(EventType.mark, event_data)
             elif event_type == SPEI_START_INPUT_STREAM:
                 event = Event(EventType.begin)
+                self.status = {'synthesizing': True, 'paused': False}
             elif event_type == SPEI_END_INPUT_STREAM:
                 event = Event(EventType.end)
+                self.status = {'synthesizing': False, 'paused': False}
             else:
                 continue
             if c is not None and stream_number == self.current_stream_number:
+                try:
                     c(event)
+                except Exception:
+                    import traceback
+                    traceback.print_exc()
 
     def speak_simple_text(self, text):
         from calibre_extensions.winsapi import (