Close decoder after each word to support slow URLStream

Author: pschatzmann

src/TextToSpeech.h

@@ -48,23 +48,23 @@ class TextToSpeech {
     LOGI("say: %s",word);
     AudioStream *mp3Stream = p_dictionary->get(word);
     if (mp3Stream != nullptr) {
+      p_decoder->begin();
       mp3Stream->begin();
       copier.begin(*decodedStream, *mp3Stream);
       copier.copyAll();
       copier.end();
       mp3Stream->end();
+      p_decoder->end();
     } else {
       LOGE("Word not available in dictionary: %s", word);
     }
   }
 
   /// a simple API to say multiple of the supported words
   void say(audio_tools::Vector<const char *> words) {
-    p_decoder->begin();
     for (auto word : words) {      
       say(word);
     }
-    p_decoder->end();
   }
 
  protected: