以前在研究百度的实时语音识别，并应用到了微信小程序中，写篇文章分享一下。

先看看完成的效果吧

前置条件

申请百度实时语音识别key

百度AI接入指南

建立小程序web

设置小程序录音参数

在index.js中输入

const recorderManager = wx.getRecorderManager()

const recorderConfig = {

duration: 600000,

frameSize: 5, //指定当录音大小达到5KB时触发onFrameRecorded

format: 'PCM',

//文档中没写这个参数也能够触发onFrameRecorded的回调，不过楼主亲测可使用

sampleRate: 16000,

encodeBitRate: 96000,

numberOfChannels: 1

}

使用websocket链接

linkSocket() {

let _this = this

//这里的sn是百度实时语音用于排查日志，这里我图方便就用时间戳了

let sn = new Date().getTime()

wx.showLoading({

title: '识别中...'

})

recorderManager.start(recorderConfig)

//开启连接

wx.connectSocket({

url: 'wss://vop.baidu.com/realtime_asr?sn=' + sn,

protocols: ['websocket'],

success() {

console.log('链接成功')

_this.initEventHandle()

}

})

},

//监听websocket返回的数据

initEventHandle() {

let _this = this

wx.onSocketMessage((res) => {

let result = JSON.parse(res.data.replace('\n',''))

if(result.type == 'MID_TEXT'){

_this.tran(result.result, 'value')

_this.setData({

textDis: 'none',

value: result.result,

})

}

if(result.type == 'FIN_TEXT'){

let value = _this.data.text

let tranStr = value + result.result

_this.tran(tranStr, 'text')

_this.setData({

value: '',

valueEn: '',

textDis: 'block',

text: tranStr,

})

}

})

wx.onSocketOpen(() =>

//发送数据帧

_this.wsStart()

console.log('WebSocket链接打开')

})

wx.onSocketError(function (res) {

console.log('WebSocket链接打开失败')

})

wx.onSocketClose(function (res) {

console.log('WebSocket 已关闭！')

})

},

发送开始、音频数据、结束帧

wsStart() {

let config = {

type: "START",

data: {

appid: XXXXXXXXX,//百度实时语音识别appid

appkey: "XXXXXXXXXXXXXXXXXX",//百度实时语音识别key

dev_pid: 15372,

cuid: "cuid-1",

format: "pcm",

sample: 16000

}

}

wx.sendSocketMessage({

data:JSON.stringify(config),

success(res){

console.log('发送开始帧成功')

}

})

},

wsSend(data){

wx.sendSocketMessage({

data:data,

success(res){

console.log('发送数据帧成功')

}

})

},

wsStop(){

let _this = this

this.setData({

click: true,

})

let config = {

type: "FINISH"

}

wx.hideLoading()

recorderManager.stop()

wx.sendSocketMessage({

data:JSON.stringify(config),

success(res){

console.log('发送结束帧成功')

}

})

},

小程序录音回调

onShow: function () {

let _this = this

recorderManager.onFrameRecorded(function (res){

let data = res.frameBuffer

_this.wsSend(data)

})

recorderManager.onInterruptionBegin(function (res){

console.log('录音中断')

_this.wsStopForAcc()

})

recorderManager.onStop(function (res){

console.log('录音中止')

})

},

wsStopForAcc(){

let _this = this

this.setData({

click: true,

})

let config = {

type: "FINISH"

}

wx.sendSocketMessage({

data:JSON.stringify(config),

success(res){

wx.hideLoading()

console.log('发送结束帧成功')

}

})

},