node-webrtc access camera and mic with speaker for webrtc video chat app

问题

I want to know how to access camera and mic for WebRTC app to stream video and add speaker for audio coming from remote peer.

const videoSource = new RTCVideoSource();
const videoTrack = videoSource.createTrack();
const audioSource = new RTCAudioSource()
const audioTrack = audioSource.createTrack();
pc.addTrack(videoTrack)
pc.addTrack(audioTrack)

here my code but not working. please help.

来源：https://stackoverflow.com/questions/56058724/node-webrtc-access-camera-and-mic-with-speaker-for-webrtc-video-chat-app