讯飞云webapi接入方法

代码部分

index.vue

<template>
  <div class="tts-record flexBox">
    <img class="desktop-svg-icon" src="../../assets/images/microphone-icon.svg" alt="" v-if="isStop" @click="say">
    <template v-else>
      <Corrugation />
      <img class="desktop-svg-icon" src="../../assets/images/tingzhi-icon.svg" alt="" @click="stop">
    </template>
  </div>
</template>

<script lang='ts'>
import IatRecorder  from './js/IatRecorder.js'
const iatRecorder = new IatRecorder()//小语种-中文方言-appId
import { Vue, Component, Prop, Emit, Watch } from 'vue-property-decorator'
@Component({
  components: {
    Corrugation: () => import('@/pages/Common/Corrugation.vue'),
  }
})
export default class Iat extends Vue {
  @Prop({
    type: Boolean,
    default: false
  })
  disabled

  @Prop({
    type: String,
    default: ''
  })
  text

  @Watch('disabled', {
    immediate: true
  })
  public watchDisabled(val: any) {
    if (val) {
      stop()
    }
  }

  isStop: boolean = true;
  searchData:string = ''
  @Watch('searchData')
  searchDataChange() {
    if (this.searchData) {
      this.$emit('updateText', this.searchData)
    }
  }

  say() {
    if (this.disabled) return
    iatRecorder.start();
    (iatRecorder as any).onTextChange = (text)=>{
	        let inputText = text
	        this.searchData= inputText.substring(0, inputText.length - 1);//文字处理，因为不知道为什么识别输出的后面都带‘。’，这个方法是去除字符串最后一位
	      }
    this.isStop = false
  }

  stop() {
    this.isStop = true;
      iatRecorder.stop()
   }

  handleRecord(text: any, isLast?: boolean) { 
    if (!this.isStop) { 
      this.$emit('updateText', text, isLast)
    }
  }

}
</script>

<style lang='less' scoped>
.tts-record {
  position: absolute;
  right: 106px;
  bottom: 22px;

  .el-icon {
    font-size: 22px;
    cursor: pointer;
    color: #878787;
    margin-left: 12px;

    &:hover {
      color: #4b72ef;
    }
  }

  .desktop-svg-icon {
    cursor: pointer;
    margin-left: 16px;
  }
}
</style>

IatRecorder.js

const APPID = 'b335f736' //在科大讯飞控制台中获取的服务接口认证信息
const API_SECRET = 'ZWMyZThhMGVlMDk0NTFjYTk2YWY1OWRh' //在科大讯飞控制台中获取的服务接口认证信息
const API_KEY = '7e8b4cc85919d8c05ae803cf128749ee' //在科大讯飞控制台中获取的服务接口认证信息
import CryptoJS from 'crypto-js'
import Worker from './transcode.worker.js'
const transWorker = new Worker()
console.log(transWorker)
var startTime = ""
var endTime = ""

function getWebSocketUrl(){
  return new Promise((resolve, reject) => {
 // 请求地址根据语种不同变化
 var url = 'wss://iat-api.xfyun.cn/v2/iat'
 var host = 'iat-api.xfyun.cn'
 var apiKey = API_KEY
 var apiSecret = API_SECRET
 var date = new Date().toGMTString()
 var algorithm = 'hmac-sha256'
 var headers = 'host date request-line'
 var signatureOrigin = `host: ${host}\ndate: ${date}\nGET /v2/iat HTTP/1.1`
 var signatureSha = CryptoJS.HmacSHA256(signatureOrigin, apiSecret)
 var signature = CryptoJS.enc.Base64.stringify(signatureSha)
 var authorizationOrigin = `api_key="${apiKey}", algorithm="${algorithm}", headers="${headers}", signature="${signature}"`
 var authorization = btoa(authorizationOrigin)
 url = `${url}?authorization=${authorization}&date=${date}&host=${host}`
 resolve(url)
 })
}
const IatRecorder = class  {
    constructor() {
      let self = this
      this.status = 'null'
      this.language = 'zh_cn'
      this.accent = 'mandarin'
      this.appId = APPID
      // 记录音频数据
      this.audioData = []
      // 记录听写结果
      this.resultText = ''
      // wpgs下的听写结果需要中间状态辅助记录
      this.resultTextTemp = ''
      transWorker.onmessage = function (event) {
        // console.log("构造方法中",self.audioData)
        self.audioData.push(...event.data)
      }
    }

    // 修改录音听写状态
    setStatus(status) {
      this.onWillStatusChange && this.status !== status && this.onWillStatusChange(this.status, status)
      this.status = status
    }
    setResultText({ resultText, resultTextTemp } = {}) {
      this.onTextChange && this.onTextChange(resultTextTemp || resultText || '')
      resultText !== undefined && (this.resultText = resultText)
      resultTextTemp !== undefined && (this.resultTextTemp = resultTextTemp)
    }
    // 修改听写参数
    setParams({ language, accent } = {}) {
      language && (this.language = language)
      accent && (this.accent = accent)
    }
    // 连接websocket
    connectWebSocket() {
      return getWebSocketUrl().then(url => {
        let iatWS
        if ('WebSocket' in window) {
          iatWS = new WebSocket(url)
        } else if ('MozWebSocket' in window) {
          iatWS = new MozWebSocket(url)
        } else {
          alert('浏览器不支持WebSocket')
          return
        }
        this.webSocket = iatWS
        this.setStatus('init')
        iatWS.onopen = e => {
          this.setStatus('ing')
          // 重新开始录音
          setTimeout(() => {
            this.webSocketSend()
          }, 500)
        }
        iatWS.onmessage = e => {
          this.result(e.data)
        }
        iatWS.onerror = e => {
          this.recorderStop()
        }
        iatWS.onclose = e => {
          endTime = Date.parse(new Date())
          console.log("持续时间",endTime-startTime)
          this.recorderStop()
        }
      })
    }
    // 初始化浏览器录音
    recorderInit() {
      navigator.getUserMedia =
        navigator.getUserMedia ||
        navigator.webkitGetUserMedia ||
        navigator.mozGetUserMedia ||
        navigator.msGetUserMedia

      // 创建音频环境
      try {
        this.audioContext = new (window.AudioContext || window.webkitAudioContext)()
        this.audioContext.resume()
        if (!this.audioContext) {
          alert('浏览器不支持webAudioApi相关接口')
          return
        }
      } catch (e) {
        if (!this.audioContext) {
          alert('浏览器不支持webAudioApi相关接口')
          return
        }
      }

      // 获取浏览器录音权限
      if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
        navigator.mediaDevices
          .getUserMedia({
            audio: true,
            video: false,
          })
          .then(stream => {
            getMediaSuccess(stream)
          })
          .catch(e => {
            getMediaFail(e)
          })
      } else if (navigator.getUserMedia) {
        navigator.getUserMedia(
          {
            audio: true,
            video: false,
          },
          stream => {
            getMediaSuccess(stream)
          },
          function(e) {
            getMediaFail(e)
          }
        )
      } else {
        if (navigator.userAgent.toLowerCase().match(/chrome/) && location.origin.indexOf('https://') < 0) {
          alert('chrome下获取浏览器录音功能，因为安全性问题，需要在localhost或127.0.0.1或https下才能获取权限')
        } else {
          alert('无法获取浏览器录音功能，请升级浏览器或使用chrome')
        }
        this.audioContext && this.audioContext.close()
        return
      }
      // 获取浏览器录音权限成功的回调
      let getMediaSuccess = stream => {
        // 创建一个用于通过JavaScript直接处理音频
        this.scriptProcessor = this.audioContext.createScriptProcessor(0, 1, 1)
        this.scriptProcessor.onaudioprocess = e => {
          // 去处理音频数据
           if (this.status === 'ing') {
             transWorker.postMessage(e.inputBuffer.getChannelData(0))
            //  this.audioData.push(e.inputBuffer.getChannelData(0))
           }
        }
        // 创建一个新的MediaStreamAudioSourceNode 对象，使来自MediaStream的音频可以被播放和操作
        this.mediaSource = this.audioContext.createMediaStreamSource(stream)
        // 连接
        this.mediaSource.connect(this.scriptProcessor)
        this.scriptProcessor.connect(this.audioContext.destination)
        this.connectWebSocket()
      }

      let getMediaFail = (e) => {
        alert('请求麦克风失败')
        this.audioContext && this.audioContext.close()
        this.audioContext = undefined
        // 关闭websocket
        if (this.webSocket && this.webSocket.readyState === 1) {
          this.webSocket.close()
        }
      }
    }
    recorderStart() {
      if (!this.audioContext) {
        this.recorderInit()
      } else {
        this.audioContext.resume()
        this.connectWebSocket()
      }
    }
    // 暂停录音
    recorderStop() {
      // safari下suspend后再次resume录音内容将是空白，设置safari下不做suspend
      if (!(/Safari/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgen))){
        this.audioContext && this.audioContext.suspend()
      }
      this.setStatus('end')
    }
    // 处理音频数据
    // transAudioData(audioData) {
    //   audioData = transAudioData.transaction(audioData)
    //   this.audioData.push(...audioData)
    // }
    // 对处理后的音频数据进行base64编码，
    toBase64(buffer) {
      var binary = ''
      var bytes = new Uint8Array(buffer)
      var len = bytes.byteLength
      for (var i = 0; i < len; i++) {
        binary += String.fromCharCode(bytes[i])
      }
      return window.btoa(binary)
    }
    // 向webSocket发送数据
    webSocketSend() {
      if (this.webSocket.readyState !== 1) {
        return
      }
      let audioData = this.audioData.splice(0, 1280)
      var params = {
        common: {
          app_id: this.appId,
        },
        business: {
          language: this.language, //小语种可在控制台--语音听写（流式）--方言/语种处添加试用
          domain: 'iat',
          accent: this.accent, //中文方言可在控制台--语音听写（流式）--方言/语种处添加试用
        },
        data: {
          status: 0,
          format: 'audio/L16;rate=16000',
          encoding: 'raw',
          audio: this.toBase64(audioData),
        },
      }
      console.log("参数language：",this.language)
      console.log("参数accent：",this.accent)
      this.webSocket.send(JSON.stringify(params))
      startTime = Date.parse(new Date())
      this.handlerInterval = setInterval(() => {
        // websocket未连接
        if (this.webSocket.readyState !== 1) {
          console.log("websocket未连接")
          this.audioData = []
          clearInterval(this.handlerInterval)
          return
        }
        if (this.audioData.length === 0) {
          console.log("自动关闭",this.status)
          if (this.status === 'end') {
            this.webSocket.send(
              JSON.stringify({
                data: {
                  status: 2,
                  format: 'audio/L16;rate=16000',
                  encoding: 'raw',
                  audio: '',
                },
              })
            )
            this.audioData = []
            clearInterval(this.handlerInterval)
          }
          return false
        }
        audioData = this.audioData.splice(0, 1280)
        // 中间帧
        this.webSocket.send(
          JSON.stringify({
            data: {
              status: 1,
              format: 'audio/L16;rate=16000',
              encoding: 'raw',
              audio: this.toBase64(audioData),
            },
          })
        )
      }, 40)
    }
    result(resultData) {
      // 识别结束
      let jsonData = JSON.parse(resultData)
      if (jsonData.data && jsonData.data.result) {
        let data = jsonData.data.result
        let str = ''
        let resultStr = ''
        let ws = data.ws
        for (let i = 0; i < ws.length; i++) {
          str = str + ws[i].cw[0].w
        }
        console.log("识别的结果为：",str)
        // 开启wpgs会有此字段(前提：在控制台开通动态修正功能)
        // 取值为 "apd"时表示该片结果是追加到前面的最终结果；取值为"rpl" 时表示替换前面的部分结果，替换范围为rg字段
        if (data.pgs) {
          if (data.pgs === 'apd') {
            // 将resultTextTemp同步给resultText
            this.setResultText({
              resultText: this.resultTextTemp,
            })
          }
          // 将结果存储在resultTextTemp中
          this.setResultText({
            resultTextTemp: this.resultText + str,
          })
        } else {
          this.setResultText({
            resultText: this.resultText + str,
          })
        }
      }
      if (jsonData.code === 0 && jsonData.data.status === 2) {
        this.webSocket.close()
      }
      if (jsonData.code !== 0) {
        this.webSocket.close()
        console.log(`${jsonData.code}:${jsonData.message}`)
      }
    }
    start() {
      this.recorderStart()
      this.setResultText({ resultText: '', resultTextTemp: '' })
    }
    stop() {
      this.recorderStop()
    }
  }

  export default IatRecorder

transcode.worker.js

self.onmessage = function(e){
  transAudioData.transcode(e.data)
}
let transAudioData = {
  transcode(audioData) {
    let output = transAudioData.to16kHz(audioData)
    output = transAudioData.to16BitPCM(output)
    output = Array.from(new Uint8Array(output.buffer))
    self.postMessage(output)
    // return output
  },
  to16kHz(audioData) {
    var data = new Float32Array(audioData)
    var fitCount = Math.round(data.length * (16000 / 44100))
    var newData = new Float32Array(fitCount)
    var springFactor = (data.length - 1) / (fitCount - 1)
    newData[0] = data[0]
    for (let i = 1; i < fitCount - 1; i++) {
      var tmp = i * springFactor
      var before = Math.floor(tmp).toFixed()
      var after = Math.ceil(tmp).toFixed()
      var atPoint = tmp - before
      newData[i] = data[before] + (data[after] - data[before]) * atPoint
    }
    newData[fitCount - 1] = data[data.length - 1]
    return newData
  },
  to16BitPCM(input) {
    var dataLength = input.length * (16 / 8)
    var dataBuffer = new ArrayBuffer(dataLength)
    var dataView = new DataView(dataBuffer)
    var offset = 0
    for (var i = 0; i < input.length; i++, offset += 2) {
      var s = Math.max(-1, Math.min(1, input[i]))
      dataView.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7fff, true)
    }
    return dataView
  },
}