[voice] add google voice support

voice/google/google_voice.py

@@ -0,0 +1,21 @@
+
+"""
+google voice service
+"""
+
+import subprocess
+import speech_recognition 
+from voice.voice import Voice
+
+class GoogleVoice(Voice):
+    recognizer = speech_recognition.Recognizer()
+
+    def __init__(self):
+        pass
+
+    def voiceToText(self, voice_file):
+        new_file = voice_file.replace('.mp3', '.wav')
+        subprocess.call('ffmpeg -i ' + voice_file + ' -acodec pcm_s16le -ac 1 -ar 16000 ' + new_file, shell=True)
+        with speech_recognition.AudioFile(new_file) as source:
+            audio = self.recognizer.record(source)
+        return self.recognizer.recognize_google(audio, language='zh-CN')