在Javascript中将立体声音频转换为单声道

var audioContext = new AudioContext();

var audioSource = audioContext.createBufferSource();
audioSource.buffer = audioBuffer; // 立体声音频文件

var splitter = audioContext.createChannelSplitter(2); // 2表示立体声
audioSource.connect(splitter);

var merger = audioContext.createChannelMerger(1); // 1表示单声道
splitter.connect(merger, 0, 0); // 将左声道连接到合并节点的输入端口0
splitter.connect(merger, 1, 0); // 将右声道连接到合并节点的输入端口0

merger.connect(audioContext.destination);

var audioContext = new AudioContext();

function convertToMono(audioBuffer) {
  var audioSource = audioContext.createBufferSource();
  audioSource.buffer = audioBuffer;

  var splitter = audioContext.createChannelSplitter(2);
  audioSource.connect(splitter);

  var merger = audioContext.createChannelMerger(1);
  splitter.connect(merger, 0, 0);
  splitter.connect(merger, 1, 0);

  merger.connect(audioContext.destination);

  audioSource.start();
}

// 加载立体声音频文件
var audioUrl = '立体声音频文件地址';
fetch(audioUrl)
  .then(response => response.arrayBuffer())
  .then(arrayBuffer => audioContext.decodeAudioData(arrayBuffer))
  .then(audioBuffer => convertToMono(audioBuffer))
  .catch(error => console.log(error));