import requests

import json

import base64

import wave

import numpy as np

if __name__ == "__main__":

    #Step1: get the Access Token

    auth_url = "https://openapi.baidu.com/oauth/2.0/token"

    grant_type = "client_credentials"

    apiKey = "************"

    secretKey = "*******************"

    data = {"grant_type":grant_type, "client_id":apiKey, "client_secret": secretKey}

    result = requests.post(url = auth_url, data = data)

    ret = json.loads(result.text)

    #Step2: 

    asr_url = "http://vop.baidu.com/server_api"

    formattype = "wav"

    cuid = "baidu_workshop"

    token = ret["access_token"]

    filename = "test.wav"

    f = wave.open(filename, "rb")

    params = f.getparams()

    nchannels, sampwidth, framerate, nframes = params[:4]

    str_data = f.readframes(nframes)

    f.close()

    wave_data = np.fromstring(str_data, dtype = np.short)

    wave_data = wave_data

    speech = base64.b64encode(wave_data)

    asr_data = {"format":formattype, "rate":framerate, "channel":nchannels, "cuid":cuid, "token":token, "speech":speech, "len":nframes}

    result = requests.post(url = asr_url, data = data)

    ret = json.loads(result.text)

返回err_no : 3300

access_token返回是OK的，python读取wav数据后是数组，直接做base64的编码后作为speech参数上传，这个是不是会有问题呢？base64编码后，数据变成以下的格式：