如何在react native中将麦克风中的PCM样本转换为字节

import { AudioRecorder, AudioUtils } from 'react-native-audio';
import Sound from 'react-native-sound';

class MicrophoneHandler {
  constructor() {
    this.audioPath = AudioUtils.DocumentDirectoryPath + '/sample.pcm';
    this.recording = null;
  }

  startRecording = async () => {
    try {
      await AudioRecorder.prepareRecordingAtPath(this.audioPath, {
        SampleRate: 44100,
        Channels: 1,
        AudioQuality: 'High',
        AudioEncoding: 'pcm',
      });

      await AudioRecorder.startRecording();
    } catch (error) {
      console.error(error);
    }
  };

  stopRecording = async () => {
    try {
      await AudioRecorder.stopRecording();
      this.recording = new Sound(this.audioPath, '', (error) => {
        if (error) {
          console.error('Failed to load the sound', error);
        }
      });
    } catch (error) {
      console.error(error);
    }
  };

  convertToBytes = () => {
    if (this.recording) {
      const buffer = this.recording.toPCM();
      const bytes = new Uint8Array(buffer.length);

      for (let i = 0; i < buffer.length; i++) {
        bytes[i] = buffer[i];
      }

      return bytes;
    }

    return null;
  };
}

const microphoneHandler = new MicrophoneHandler();

// 开始录制麦克风样本
microphoneHandler.startRecording();

// 结束录制麦克风样本
microphoneHandler.stopRecording();

// 转换为字节
const bytes = microphoneHandler.convertToBytes();