ArkTS音频采集,音频采集的主要工作是通过输入设备将声音采集并转码为音频数据

export default class RecordModel { 
  private tag: string = 'RecordModel' 
  private audioRecorder: media.AudioRecorder = undefined 
  initAudioRecorder(handleStateChange: () => void) { 
    this.release(); 
    this.audioRecorder = media.createAudioRecorder() 
    Logger.info(this.tag, 'create audioRecorder success') 
    //音频录制参数设置完成 
    this.audioRecorder.on('prepare', () => { 
      Logger.info(this.tag, 'setCallback  prepare case callback is called') 
      this.audioRecorder.start() 
    }) 
    //音频录制开始 
    this.audioRecorder.on('start', () => { 
      Logger.info(this.tag, 'setCallback start case callback is called') 
      handleStateChange() 
    }) 
    //音频停止录制 
    this.audioRecorder.on('stop', () => { 
      Logger.info(this.tag, 'audioRecorder stop called') 
      this.audioRecorder.release() 
    }) 
    //音频暂停录制 
    this.audioRecorder.on('pause', () => { 
      Logger.info(this.tag, 'audioRecorder pause finish') 
      handleStateChange() 
    }) 
    //音频恢复录制 
    this.audioRecorder.on('resume', () => { 
      Logger.info(this.tag, 'audioRecorder resume finish') 
      handleStateChange() 
    }) 
  } 
  //do something 
}

let audioRecorderConfig = { 
  audioEncodeBitRate: 22050, 
  audioSampleRate: 22050, 
  numberOfChannels: 2, 
  location: { latitude: 30, longitude: 130 }, 
  audioEncoderMime: media.CodecMimeType.AUDIO_AAC, 
  fileFormat: media.ContainerFormatType.CFT_MPEG_4A, 
  uri: ''                              // fb路径由媒体库生成 
}

startRecorder(pathName: string) { 
  Logger.info(this.tag, `startRecorder, pathName = ${pathName}`) 
  if (typeof (this.audioRecorder) !== 'undefined') { 
    Logger.info(this.tag, 'start prepare') 
    audioConfig.uri = pathName 
    this.audioRecorder.prepare(audioConfig) 
  } else { 
    Logger.error(this.tag, 'case failed, audioRecorder is null') 
  } 
}

pause() { 
  Logger.info(this.tag, 'audioRecorder pause called') 
  if (typeof (this.audioRecorder) !== `undefined`) { 
    this.audioRecorder.pause() 
  } 
} 
 
resume() { 
  Logger.info(this.tag, 'audioRecorder resume called') 
  if (typeof (this.audioRecorder) !== `undefined`) { 
    this.audioRecorder.resume() 
  } 
} 
 
release() { 
  if (typeof (this.audioRecorder) !== `undefined`) { 
    Logger.info(this.tag, 'audioRecorder  release') 
    this.audioRecorder.release() 
    this.audioRecorder = undefined 
  } 
} 
 
finish() { 
  if (typeof (this.audioRecorder) !== `undefined`) { 
    this.audioRecorder.stop() 
  } 
}