如何通过管道将Howler.masterGain输出传输到mediaRecorder

var sound = new Howl({
  src: ['audio.mp3'],
  volume: 0.5, // 设置音量为0.5
});

sound.play();

var audioContext = new (window.AudioContext || window.webkitAudioContext)();
var mediaStreamDestination = audioContext.createMediaStreamDestination();

// 连接Howler.js的音频输出到MediaStreamDestination
var howlerSource = audioContext.createMediaElementSource(sound._sounds[0]._node);
howlerSource.connect(mediaStreamDestination);

var mediaRecorder = new MediaRecorder(mediaStreamDestination.stream, {
  mimeType: 'audio/webm', // 设置音频格式为WebM
  audioBitsPerSecond: 128000, // 设置音频比特率
});

var recordedChunks = [];

mediaRecorder.addEventListener('dataavailable', function(event) {
  recordedChunks.push(event.data);
});

mediaRecorder.start();

// 停止录制
setTimeout(function() {
  mediaRecorder.stop();
}, 5000); // 录制5秒钟

mediaRecorder.addEventListener('stop', function() {
  var recordedBlob = new Blob(recordedChunks, { type: 'audio/webm' });

  // 可以将Blob对象上传到服务器或进行其他处理
});