pion/webrtc -如何在GO Pion API中设置音频接收器和源？

import (
    "github.com/pion/webrtc/v3"
    "github.com/pion/webrtc/v3/pkg/media"
)

mediaEngine := webrtc.MediaEngine{}
mediaEngine.RegisterCodec(webrtc.NewOpusCodec(webrtc.DefaultPayloadTypeOpus, 48000))

api := webrtc.NewAPI(webrtc.WithMediaEngine(mediaEngine))

peerConnection, err := api.NewPeerConnection(webrtc.Configuration{})
if err != nil {
    // 处理错误
}

audioTrack, err := peerConnection.NewTrack(webrtc.DefaultPayloadTypeOpus, rand.Uint32(), "audio", "pion")
if err != nil {
    // 处理错误
}

_, err = peerConnection.AddTrack(audioTrack)
if err != nil {
    // 处理错误
}

audioReceiver := &SampleAudioReceiver{}
peerConnection.OnTrack(func(track *webrtc.Track, receiver *webrtc.RTPReceiver) {
    if track.Kind() == webrtc.RTPCodecTypeAudio {
        track.AddReceiver(audioReceiver)
    }
})