separate the cache & avoid voice overlap

- The cache is now stored in a TTS specific directory
- Only a single fallback-tts is created

mycroft/audio/speech.py

@@ -30,6 +30,7 @@ config = None
 tts = None
 tts_hash = None
 lock = Lock()
+mimic_fallback_obj = None
 
 _last_stop_signal = 0
 
@@ -130,11 +131,15 @@ def mute_and_speak(utterance, ident):
 
 
 def mimic_fallback_tts(utterance, ident):
+    global mimic_fallback_obj
     # fallback if connection is lost
     config = Configuration.get()
     tts_config = config.get('tts', {}).get("mimic", {})
     lang = config.get("lang", "en-us")
-    tts = Mimic(lang, tts_config)
+    if not mimic_fallback_obj:
+        mimic_fallback_obj = Mimic(lang, tts_config)
+    tts = mimic_fallback_obj
+    LOG.debug("Mimic fallback, utterance : " + str(utterance))
     tts.init(bus)
     tts.execute(utterance, ident)
 

mycroft/tts/__init__.py

@@ -177,6 +177,7 @@ class TTS:
         self.playback.start()
         self.clear_cache()
         self.spellings = self.load_spellings()
+        self.tts_name = type(self).__name__
 
     def load_spellings(self):
         """Load phonetic spellings of words as dictionary"""
@@ -209,7 +210,7 @@ class TTS:
 
         self.bus.emit(Message("recognizer_loop:audio_output_end"))
         # Clean the cache as needed
-        cache_dir = mycroft.util.get_cache_directory("tts")
+        cache_dir = mycroft.util.get_cache_directory("tts/" + self.tts_name)
         mycroft.util.curate_cache(cache_dir, min_free_percent=100)
 
         # This check will clear the "signal"
@@ -313,8 +314,9 @@ class TTS:
         for sentence in chunks:
             key = str(hashlib.md5(
                 sentence.encode('utf-8', 'ignore')).hexdigest())
-            wav_file = os.path.join(mycroft.util.get_cache_directory("tts"),
-                                    key + '.' + self.audio_ext)
+            wav_file = os.path.join(
+                mycroft.util.get_cache_directory("tts/" + self.tts_name),
+                key + '.' + self.audio_ext)
 
             if os.path.exists(wav_file):
                 LOG.debug("TTS cache hit")
@@ -341,11 +343,16 @@ class TTS:
         """ Remove all cached files. """
         if not os.path.exists(mycroft.util.get_cache_directory('tts')):
             return
-        for f in os.listdir(mycroft.util.get_cache_directory("tts")):
-            file_path = os.path.join(mycroft.util.get_cache_directory("tts"),
-                                     f)
-            if os.path.isfile(file_path):
-                os.unlink(file_path)
+        for d in os.listdir(mycroft.util.get_cache_directory("tts")):
+            dir_path = os.path.join(mycroft.util.get_cache_directory("tts"), d)
+            if os.path.isdir(dir_path):
+                for f in os.listdir(dir_path):
+                    file_path = os.path.join(dir_path, f)
+                    if os.path.isfile(file_path):
+                        os.unlink(file_path)
+            # If no sub-folders are present, check if it is a file & clear it
+            elif os.path.isfile(dir_path):
+                os.unlink(dir_path)
 
     def save_phonemes(self, key, phonemes):
         """
@@ -355,8 +362,7 @@ class TTS:
                 key:        Hash key for the sentence
                 phonemes:   phoneme string to save
         """
-
-        cache_dir = mycroft.util.get_cache_directory("tts")
+        cache_dir = mycroft.util.get_cache_directory("tts/" + self.tts_name)
         pho_file = os.path.join(cache_dir, key + ".pho")
         try:
             with open(pho_file, "w") as cachefile:
@@ -372,8 +378,9 @@ class TTS:
             Args:
                 Key:    Key identifying phoneme cache
         """
-        pho_file = os.path.join(mycroft.util.get_cache_directory("tts"),
-                                key + ".pho")
+        pho_file = os.path.join(
+            mycroft.util.get_cache_directory("tts/" + self.tts_name),
+            key + ".pho")
         if os.path.exists(pho_file):
             try:
                 with open(pho_file, "r") as cachefile:

mycroft/tts/mimic2_tts.py

@@ -266,8 +266,7 @@ class Mimic2(TTS):
                 key:        Hash key for the sentence
                 phonemes:   phoneme string to save
         """
-
-        cache_dir = get_cache_directory("tts")
+        cache_dir = get_cache_directory("tts/" + self.tts_name)
         pho_file = os.path.join(cache_dir, key + ".pho")
         try:
             with open(pho_file, "w") as cachefile:
@@ -282,7 +281,8 @@ class Mimic2(TTS):
             Args:
                 Key:    Key identifying phoneme cache
         """
-        pho_file = os.path.join(get_cache_directory("tts"), key + ".pho")
+        pho_file = os.path.join(get_cache_directory("tts/" + self.tts_name),
+                                key + ".pho")
         if os.path.exists(pho_file):
             try:
                 with open(pho_file, "r") as cachefile: