网络音频 - 将3个音频流合并为1个

Question

相信它应该是可能的。

目前我只能从一个获取流：

let mediaElement = document.createElement("img");
mediaElement.className = "fileMedia";
mediaElement.style.maxWidth = "280px";
mediaElement.crossOrigin = "anonymous";
mediaElement.controls = true;
mediaElement.src = URL.createObjectURL(selectedLocalMedia); // a file from type="file" input

  let audioCtx = new AudioContext();
  // create placeholder stream from our AudioContext
  let dest = audioCtx.createMediaStreamDestination();
  this.audioStream[pluginHandleIndex] = dest.stream;

  // connect our video element's output to the stream
  let sourceNode = audioCtx.createMediaElementSource(mediaElement);

  // if (pluginHandleIndex > 0) {
  //   let testvideo = document.getElementById("testvideo");
  //   let sourceNodeTwo = audioCtx.createMediaElementSource(testvideo);
  //   sourceNodeTwo.connect(dest);
  // }
  sourceNode.connect(dest);
  sourceNode.connect(audioCtx.destination);

如何向this.audioStream[pluginHandleIndex]（audioCtx.createMediaStreamDestination()）添加更多音频流？

如果您看到注释行

// if (pluginHandleIndex > 0) {
  //   let testvideo = document.getElementById("testvideo");
  //   let sourceNodeTwo = audioCtx.createMediaElementSource(testvideo);
  //   sourceNodeTwo.connect(dest);
  // }

我试着像第一次一样加入tome，但这似乎不起作用：/

谢谢！