Javascript 将P5js AudioIn获取到MediaStream对象

我正在尝试合并音频和视频流。我使用的是

p5.js

，无法从

p5.js的AudioIn函数中获取mediastream对象

下面是代码片段：

audioRecorder = new p5.SoundRecorder();
audioRecorder.setInput(voiceStream);
voiceStream.start();
let ctx = new AudioContext();
let sourceNode2 = ctx.createMediaStreamSource(voiceStream);
let dest = ctx.createMediaStreamDestination();
//... connecting stream to dest code goes here
let audioTrack = dest.stream.getAudioTracks()[0];