如何在Javascript中将音频缓冲区转换为MP3？

const audioContext = new AudioContext();
const audioBufferSourceNode = audioContext.createBufferSource();

fetch('audio.wav')
  .then(response => response.arrayBuffer())
  .then(arrayBuffer => audioContext.decodeAudioData(arrayBuffer))
  .then(audioBuffer => {
    audioBufferSourceNode.buffer = audioBuffer;
    audioBufferSourceNode.connect(audioContext.destination);
    audioBufferSourceNode.start();
  });

const mp3Encoder = new lamejs.Mp3Encoder(1, audioContext.sampleRate, 128);
const samples = audioBuffer.getChannelData(0) * 32767; // 将音频缓冲区的数据转换为16位有符号整数

const mp3Data = [];
const sampleBlockSize = 1152; // MP3帧的样本块大小

for (let i = 0; i < samples.length; i += sampleBlockSize) {
  const sampleBlock = samples.subarray(i, i + sampleBlockSize);
  const mp3Block = mp3Encoder.encodeBuffer(sampleBlock);
  mp3Data.push(mp3Block);
}

const finalMp3Block = mp3Encoder.flush();
mp3Data.push(finalMp3Block);

const mp3Blob = new Blob(mp3Data, { type: 'audio/mp3' });

const mp3Url = URL.createObjectURL(mp3Blob);
const downloadLink = document.createElement('a');
downloadLink.href = mp3Url;
downloadLink.download = 'audio.mp3';
downloadLink.click();