如何从音轨中获取ArrayBuffer？

// 创建一个录音器
const audioContext = new (window.AudioContext || window.webkitAudioContext)();
const recorder = audioContext.createScriptProcessor(4096, 1, 1);

// 监听音频数据
recorder.onaudioprocess = function(event) {
  const audioBuffer = event.inputBuffer;
  const channelData = audioBuffer.getChannelData(0);
  
  // 将音频数据转换为ArrayBuffer
  const arrayBuffer = bufferToWave(channelData);
  
  // 在这里使用arrayBuffer进行后续处理
};

// 创建一个AudioBuffer，并填充音频数据
function bufferToWave(channelData) {
  const audioBuffer = audioContext.createBuffer(1, channelData.length, audioContext.sampleRate);
  const audioData = audioBuffer.getChannelData(0);
  audioData.set(channelData);

  // 转换为ArrayBuffer
  const buffer = new ArrayBuffer(audioData.length * 2);
  const view = new DataView(buffer);
  for (let i = 0; i < audioData.length; i++) {
    view.setInt16(i * 2, audioData[i] * 0x7FFF, true);
  }
  
  return buffer;
}

// 开始录制音轨
navigator.mediaDevices.getUserMedia({ audio: true })
  .then(function(stream) {
    const audioSource = audioContext.createMediaStreamSource(stream);
    audioSource.connect(recorder);
    recorder.connect(audioContext.destination);
  })
  .catch(function(error) {
    console.error(error);
  });