百度语音识别API的python使用示例
2018-07-20 来源:open-open
百度给的样例程序,不论C还是Java版,都分为method1和method2两种
前者称为隐式(post的是json串,音频数据编码到json里),后者称为显式(post的就是音频数据)
一开始考虑到python wave包处理的都是“字符串”,担心跟C语言的数组不一致,所以选择低效但保险的method1,
即先将音频数据base64编码,再加上采样率、通道数等信息汇集成dict,最后总体编码成json串
结果老是报:
3300 输入参数不正确
先后试过urllib2和pycurl包,都是上面情况
不得已换用method2,成功(看来wave包对音频的存储并不是“字符串”)
#encoding=utf-8 import wave import urllib, urllib2, pycurl import base64 import json ## get access token by api key & secret key def get_token(): apiKey = "xxxxxxxx" secretKey = "xxxxxxxxx" auth_url = "https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials&client_id=" + apiKey + "&client_secret=" + secretKey; res = urllib2.urlopen(auth_url) json_data = res.read() return json.loads(json_data)['access_token'] def dump_res(buf): print buf ## post audio to server def use_cloud(token): fp = wave.open('vad_0.wav', 'rb') nf = fp.getnframes() f_len = nf * 2 audio_data = fp.readframes(nf) cuid = "xxxxxxxxxx" #my xiaomi phone MAC srv_url = 'http://vop.baidu.com/server_api' + '?cuid=' + cuid + '&token=' + token http_header = [ 'Content-Type: audio/pcm; rate=8000', 'Content-Length: %d' % f_len ] c = pycurl.Curl() c.setopt(pycurl.URL, str(srv_url)) #curl doesn't support unicode #c.setopt(c.RETURNTRANSFER, 1) c.setopt(c.HTTPHEADER, http_header) #must be list, not dict c.setopt(c.POST, 1) c.setopt(c.CONNECTTIMEOUT, 30) c.setopt(c.TIMEOUT, 30) c.setopt(c.WRITEFUNCTION, dump_res) c.setopt(c.POSTFIELDS, audio_data) c.setopt(c.POSTFIELDSIZE, f_len) c.perform() #pycurl.perform() has no return val if __name__ == "__main__": token = get_token() use_cloud(token)
运行结果
{"corpus_no":"6150045491002357923","err_msg":"success.","err_no":0,"result":["播放小苹果,"],"sn":"243903724071431919050"}
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