申请语音权限

ohos.permission.MICROPHONE

初始化引擎

this.asrEngine = await speechRecognizer.createEngine({
  language: 'zh-CN',  // 中文
  online: 1  // 离线
})

设置回调，用来接收语音识别相关的回调信息

export enum VoiceState {
  DEFAULT, // 默认
  VOICING, // 录音中
  VOICEOVER, // 录音结束
}


const _this = this
this.asrEngine.setListener({
      // 开始识别成功回调
  onStart(sessionId: string, eventMessage: string) {
    console.info(`onStart, sessionId: ${sessionId} eventMessage: ${eventMessage}`);
  },
      // 事件回调
  onEvent(sessionId: string, eventCode: number, eventMessage: string) {
    console.info(`onEvent, sessionId: ${sessionId} eventCode: ${eventCode} eventMessage: ${eventMessage}`);
  },
      // 识别结果回调，包括中间结果和最终结果
  onResult(sessionId: string, result: speechRecognizer.SpeechRecognitionResult) {
    _this.keyword = result.result
    _this.onChange(result.result)
    console.info(`onResult, sessionId: ${sessionId} sessionId: ${JSON.stringify(result)}`);
  },
      // 识别完成回调
  onComplete(sessionId: string, eventMessage: string) {
    _this.onComplete(_this.keyword)
    _this.keyword = ''
    _this.voiceState = VoiceState.DEFAULT
    console.info(`onComplete, sessionId: ${sessionId} eventMessage: ${eventMessage}`);
  },
      // 错误回调
  onError(sessionId: string, errorCode: number, errorMessage: string) {
    console.error(`onError, sessionId: ${sessionId} errorCode: ${errorCode} errorMessage: ${errorMessage}`);
  }
})

设置开始识别的相关参数，调用startListening方法，开始合成

this.asrEngine?.startListening({
  sessionId: this.asrEngineId,  // 会话ID
  audioInfo: {
    audioType: 'pcm',  // 音频类型
    sampleRate: 16000,  // 音频的采样率
    soundChannel: 1,  // 音频返回的通道数信息
    sampleBit: 16  // 音频返回的采样位数
  }
})

录制音频

1. 配置音频采集参数并创建AudioCapturer实例

// 表示音频流信息
const audioStreamInfo: audio.AudioStreamInfo = {
  samplingRate: audio.AudioSamplingRate.SAMPLE_RATE_16000,  // 音频文件的采样率
  channels: audio.AudioChannel.CHANNEL_1,  // 音频文件的通道数
  sampleFormat: audio.AudioSampleFormat.SAMPLE_FORMAT_S16LE,  // 音频采样格式
  encodingType: audio.AudioEncodingType.ENCODING_TYPE_RAW  // 音频编码格式
}

// 表示采集器信息
const audioCapturerInfo: audio.AudioCapturerInfo = {
  source: audio.SourceType.SOURCE_TYPE_MIC,  // 音频类型
  capturerFlags: 0  // 音频采集器标志
}


const audioCapturerOptions: audio.AudioCapturerOptions = {
  streamInfo: audioStreamInfo,
  capturerInfo: audioCapturerInfo
}



this.audioCapturer = await audio.createAudioCapturer(audioCapturerOptions)

2. 调用on('readData')方法，订阅监听音频数据读入回调

this.audioCapturer.on('readData', (buffer) => {
  this.asrEngine?.writeAudio(this.asrEngineId, new Uint8Array(buffer))
})

3. 调用start()方法进入running状态，开始录制音频

await this.audioCapturer.start()
this.voiceState = VoiceState.VOICING

取消录制

async closeRecord() {
  this.audioCapturer?.stop()  // 调用stop()方法停止录制
  this.audioCapturer?.release()  调用release()方法销毁实例，释放资源
  // 结束识别，调用 finish 方法
  this.asrEngine?.finish(this.asrEngineId)
  // 取消识别，调用 cancel 方法
  this.asrEngine?.cancel(this.asrEngineId)
  // 释放语音识别引擎资源，调用shutdown方法
  this.asrEngine?.shutdown()
  if (this.keyword) {
    this.voiceState = VoiceState.DEFAULT
    this.keyword = ''
  } else {
    this.voiceState = VoiceState.VOICEOVER
  }
}

通过长按属性执行开始录音和取消录音

.gesture(
  // 长按手势
  LongPressGesture()
    .onAction(() => {
      // 长按开始-开始录音
      this.startRecord()
    })
    .onActionEnd(() => {
      // 长按结束-结束录音
      this.closeRecord()
    })
    .onActionCancel(() => {
      // 长按取消-结束录音
      this.closeRecord()
    })
)