#!/usr/bin/env python
# coding: utf-8
import urllib2
import json
import base64
import  os
import codecs



def asr(WAVE_FILE):
#设置应用信息
		baidu_server = "https://openapi.baidu.com/oauth/2.0/token?"
		grant_type = "client_credentials"
		client_id = "f2qgYOAj2vk3Dqdd4ADV6dWB" #填写API Key
		client_secret = "0sj87GtzqmsCTK6gYG5Ne4rRn3mGL3ql" #填写Secret Key

		#合成请求token的URL
		url = baidu_server+"grant_type="+grant_type+"&client_id="+client_id+"&client_secret="+client_secret

		#获取token
		res = urllib2.urlopen(url).read()
		data = json.loads(res)
		token = data["access_token"]
		#print token

		#设置音频属性，根据百度的要求，采样率必须为8000，压缩格式支持pcm（不压缩）、wav、opus、speex、amr
		VOICE_RATE = 8000
		#WAVE_FILE = "test.wav" #音频文件的路径
		USER_ID = "hail_hydra" #用于标识的ID，可以随意设置
		WAVE_TYPE = "wav"

		#打开音频文件，并进行编码
		f = open(WAVE_FILE, "r")
		speech = base64.b64encode(f.read())
		size = os.path.getsize(WAVE_FILE)
		update = json.dumps({"format":WAVE_TYPE, "rate":VOICE_RATE, 'channel':1,'cuid':USER_ID,'token':token,'speech':speech,'len':size})
		headers = { 'Content-Type' : 'application/json' } 
		url = "http://vop.baidu.com/server_api"
		req = urllib2.Request(url, update, headers)

		r = urllib2.urlopen(req)


		t = r.read()
		result = json.loads(t)
		#print result

		if result['err_msg']=='success.':
		    word = result['result'][0].encode('utf-8')
		    if word!='':
		        if word[len(word)-3:len(word)]=='，':
		            print word[0:len(word)-3]
		            return word[0:len(word)-3]
		        else:
		            print word
		    else:
		        print "音频文件不存在或格式错误"
		else:
		    print "错误"