Make API a method of group.

group.go

@@ -47,6 +47,10 @@ var groups struct {
 	api    *webrtc.API
 }
 
+func (g *group) API() *webrtc.API {
+	return groups.api
+}
+
 func addGroup(name string, desc *groupDescription) (*group, error) {
 	groups.mu.Lock()
 	defer groups.mu.Unlock()

rtpconn.go

@@ -109,8 +109,8 @@ type rtpDownConnection struct {
 	iceCandidates  []*webrtc.ICECandidateInit
 }
 
-func newDownConn(id string, remote upConnection) (*rtpDownConnection, error) {
-	pc, err := groups.api.NewPeerConnection(iceConfiguration())
+func newDownConn(c client, id string, remote upConnection) (*rtpDownConnection, error) {
+	pc, err := c.Group().API().NewPeerConnection(iceConfiguration())
 	if err != nil {
 		return nil, err
 	}
@@ -371,7 +371,7 @@ func (up *rtpUpConnection) complete() bool {
 }
 
 func newUpConn(c client, id string) (*rtpUpConnection, error) {
-	pc, err := groups.api.NewPeerConnection(iceConfiguration())
+	pc, err := c.Group().API().NewPeerConnection(iceConfiguration())
 	if err != nil {
 		return nil, err
 	}

webclient.go

@@ -302,7 +302,7 @@ func getConn(c *webClient, id string) iceConnection {
 }
 
 func addDownConn(c *webClient, id string, remote upConnection) (*rtpDownConnection, error) {
-	conn, err := newDownConn(id, remote)
+	conn, err := newDownConn(c, id, remote)
 	if err != nil {
 		return nil, err
 	}