fix

main.go

@@ -20,7 +20,7 @@ func wsHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	peer := NewPeer(conn, room)
-	room.Add(peer)
+	room.AddPeer(peer)
 
 	go peer.ReadLoop()
 }

peer.go

@@ -63,13 +63,8 @@ func NewPeer(conn *websocket.Conn, room *Room) *Peer {
 	pc.OnTrack(func(remote *webrtc.TrackRemote, _ *webrtc.RTPReceiver) {
 		local := NewTrack(remote)
 
-		p.Room.mu.Lock()
-		for _, other := range p.Room.peers {
-			if other.ID != p.ID {
-				other.AddTrack(local)
-			}
-		}
-		p.Room.mu.Unlock()
+		// 🔥 регистрируем трек в комнате
+		p.Room.AddTrack(p, local)
 
 		for {
 			pkt, _, err := remote.ReadRTP()
@@ -95,7 +90,7 @@ func (p *Peer) AddTrack(track *Track) {
 func (p *Peer) ReadLoop() {
 	defer func() {
 		p.Conn.Close()
-		p.Room.Remove(p.ID)
+		p.Room.RemovePeer(p.ID)
 		p.PC.Close()
 	}()
 

room.go

@@ -3,24 +3,47 @@ package main
 import "sync"
 
 type Room struct {
-	mu    sync.Mutex
-	peers map[string]*Peer
+	mu     sync.Mutex
+	peers  map[string]*Peer
+	tracks []*Track
 }
 
 func NewRoom() *Room {
 	return &Room{
-		peers: make(map[string]*Peer),
+		peers:  make(map[string]*Peer),
+		tracks: make([]*Track, 0),
 	}
 }
 
-func (r *Room) Add(p *Peer) {
+func (r *Room) AddPeer(p *Peer) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
+
 	r.peers[p.ID] = p
+
+	// 🔥 ВАЖНО: отдать новому peer ВСЕ существующие треки
+	for _, track := range r.tracks {
+		p.AddTrack(track)
+	}
 }
 
-func (r *Room) Remove(id string) {
+func (r *Room) RemovePeer(id string) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 	delete(r.peers, id)
 }
+
+func (r *Room) AddTrack(from *Peer, track *Track) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	// сохраняем трек
+	r.tracks = append(r.tracks, track)
+
+	// форвардим всем, кроме источника
+	for _, peer := range r.peers {
+		if peer.ID != from.ID {
+			peer.AddTrack(track)
+		}
+	}
+}