node百度语音识别

绝对干货，直接代码详解

1. 截取一段音频文件（wav）

eg:audio.wav

2. 验证语音识别账户

var config_data= {
    apiKey: "4eymBfpmT4Laaaaaaaa",
    secretKey: "daa65d352b7ec5583aaaaaaaaaaaaaaa",
    cuid: "sewise_pakison",
    format: "wav",
    rate: 16000
};
var httpobj=require('./http.js');
httpobj.httpget('openapi.baidu.com',"http://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials" + "&client_id=" + config_data.apiKey + "&client_secret=" + config_data.secretKey,'GET',function(ret){
console.log(ret);
}）

3. 利用dns模块解析百度语音的域名IP地址

var dns=require('dns');
dns.resolve('vop.baidu.com',function(err,data){ 
    console.log(data);
}）

4. 最后一步最重要，创建流将wav文件上传到百度语音接口进行解析

            var file = fs.readFileSync( './audio.wav');
            var len = file.length;
            var dns=require('dns');
            dns.resolve('vop.baidu.com',function(err,data){
                if(err) return;
                var request = http.request({
                    hostname:data[0],
                    host : 'vop.baidu.com',
                    port : 80,
                    path : '/server_api?token='+ret.access_token+'&cuid='+config_data.cuid,
                    method : 'POST',
                    headers : {
                        'Content-Type' : 'audio/wav; rate='+config_data.rate,
                        'Content-Length' :len,
                        'Host':'vop.baidu.com'
                    }
                }, function (response) {
                    var data = '';
                    response.on('data', function(chunk) {
                        data += chunk.toString();
                    });
                    response.on('end', function() {
                        var result=JSON.parse(data);
                        if(result.err_no==0){
                            console.log(result.result[0]);
                        }else{
                            console.log('failed')
                        }
                    });
                });
                fs.createReadStream('./audio.wav', { bufferSize: 4 * 1024 })
                    // set "end" to false in the options so .end() isnt called on the request
                    .pipe(request) 
                    .on('end', function() {

                    });