Add char limit warn (#3130)

* Add char limit warning

* Adding v2 langs

* cached_property for cutlet

* Fix import

TTS/tts/layers/xtts/tokenizer.py

@@ -8,6 +8,7 @@
 from hangul_romanize.rule import academic
 from num2words import num2words
 from tokenizers import Tokenizer
+from functools import cached_property
 
 from TTS.tts.layers.xtts.zh_num2words import TextNorm as zh_num2words
 
@@ -535,11 +536,50 @@ def korean_cleaners(text):
 class VoiceBpeTokenizer:
     def __init__(self, vocab_file=None):
         self.tokenizer = None
-        self.katsu = None
         if vocab_file is not None:
             self.tokenizer = Tokenizer.from_file(vocab_file)
+        self.char_limits = {
+            "en": 250,
+            "de": 253,
+            "fr": 273,
+            "es": 239,
+            "it": 213,
+            "pt": 203,
+            "pl": 224,
+            "zh-cn": 82,
+            "ar": 166,
+            "cs": 186,
+            "ru": 182,
+            "nl": 251,
+            "tr": 226,
+            "ja": 71,
+            "hu": 224,
+            "ko": 95,
+        }
+
+    @cached_property
+    def katsu(self):
+        import cutlet
+        return cutlet.Cutlet()
+
+    def check_input_length(self, txt, lang):
+        limit = self.char_limits.get(lang, 250)
+        if len(txt) > limit:
+            print(f"[!] Warning: The text length exceeds the character limit of {limit} for language '{lang}', this might cause truncated audio.")
+
+    def preprocess_text(self, txt, lang):
+        if lang in ["en", "es", "fr", "de", "pt", "it", "pl", "ar", "cs", "ru", "nl", "tr", "zh-cn"]:
+            txt = multilingual_cleaners(txt, lang)
+            if lang == "zh-cn":
+                txt = chinese_transliterate(txt)
+        elif lang == "ja":                
+            txt = japanese_cleaners(txt, self.katsu)
+        else:
+            raise NotImplementedError()
+        return txt
 
     def encode(self, txt, lang):
+        self.check_input_length(txt, lang)
         txt = self.preprocess_text(txt, lang)
         txt = f"[{lang}]{txt}"
         txt = txt.replace(" ", "[SPACE]")