implement server TLS support (RTSPS)

server.go

@@ -2,6 +2,7 @@ package gortsplib
 
 import (
 	"bufio"
+	"crypto/tls"
 	"net"
 )
 
@@ -23,10 +24,15 @@ func (s *Server) Accept() (*ServerConn, error) {
 		return nil, err
 	}
 
+	conn := nconn
+	if s.conf.TLSConfig != nil {
+		conn = tls.Server(conn, s.conf.TLSConfig)
+	}
+
 	return &ServerConn{
 		s:     s,
 		nconn: nconn,
-		br:    bufio.NewReaderSize(nconn, serverReadBufferSize),
-		bw:    bufio.NewWriterSize(nconn, serverWriteBufferSize),
+		br:    bufio.NewReaderSize(conn, serverReadBufferSize),
+		bw:    bufio.NewWriterSize(conn, serverWriteBufferSize),
 	}, nil
 }