[demo] support English

app.py

@@ -19,7 +19,8 @@ import wenetruntime as wenet
 import librosa
 
 wenet.set_log_level(2)
-decoder_cn = wenet.Decoder(lang='chs')
+decoder = wenet.Decoder(lang='chs')
+cur_lang = 'CN'
 # decoder_en = wenet.Decoder(lang='en')
 
 
@@ -30,12 +31,20 @@ def recognition(audio, lang='CN'):
     # NOTE: model supports 16k sample_rate
     y = (y * (1 << 15)).astype("int16")
     if lang == 'CN':
-        ans = decoder_cn.decode(y.tobytes(), True)
+        if cur_lang != lang:
+            del decoder
+            decoder = wenet.Decoder(lang='chs')
+            cur_lang = 'CN'
     elif lang == 'EN':
+        if cur_lang != lang:
+            del decoder
+            decoder = wenet.Decoder(lang='en')
+            cur_lang = 'EN'
         # ans = decoder_en.decode(y.tobytes(), True)
         return "ERROR! English is not supported yet!"
     else:
         return "ERROR! Please select a language!"
+    ans = decoder.decode(y.tobytes(), True)
     if ans is None:
         return "ERROR! No text output! Please try again!"
     # NOTE: ans (json)