Add proxy example (#141) (#175)

* cleanup

* add proxy example

examples/proxy/server.go

@@ -0,0 +1,100 @@
+package main
+
+import (
+	"log"
+
+	"github.com/aler9/gortsplib/v2"
+	"github.com/aler9/gortsplib/v2/pkg/base"
+)
+
+type server struct {
+	getStream func() *gortsplib.ServerStream
+}
+
+func newServer(
+	getStream func() *gortsplib.ServerStream,
+) *server {
+	s := &server{
+		getStream: getStream,
+	}
+
+	// configure the server
+	rs := &gortsplib.Server{
+		Handler:           s,
+		RTSPAddress:       ":8554",
+		UDPRTPAddress:     ":8000",
+		UDPRTCPAddress:    ":8001",
+		MulticastIPRange:  "224.1.0.0/16",
+		MulticastRTPPort:  8002,
+		MulticastRTCPPort: 8003,
+	}
+
+	// start server and wait until a fatal error
+	log.Printf("server is ready")
+	panic(rs.StartAndWait())
+}
+
+// called when a connection is opened.
+func (s *server) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
+	log.Printf("conn opened")
+}
+
+// called when a connection is closed.
+func (s *server) OnConnClose(ctx *gortsplib.ServerHandlerOnConnCloseCtx) {
+	log.Printf("conn closed (%v)", ctx.Error)
+}
+
+// called when a session is opened.
+func (s *server) OnSessionOpen(ctx *gortsplib.ServerHandlerOnSessionOpenCtx) {
+	log.Printf("session opened")
+}
+
+// called when a session is closed.
+func (s *server) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionCloseCtx) {
+	log.Printf("session closed")
+}
+
+// called when receiving a DESCRIBE request.
+func (s *server) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
+	log.Printf("describe request")
+
+	stream := s.getStream()
+
+	// stream is not available yet
+	if stream == nil {
+		return &base.Response{
+			StatusCode: base.StatusNotFound,
+		}, nil, nil
+	}
+
+	return &base.Response{
+		StatusCode: base.StatusOK,
+	}, stream, nil
+}
+
+// called when receiving a SETUP request.
+func (s *server) OnSetup(ctx *gortsplib.ServerHandlerOnSetupCtx) (*base.Response, *gortsplib.ServerStream, error) {
+	log.Printf("setup request")
+
+	stream := s.getStream()
+
+	// stream is not available yet
+	if stream == nil {
+		return &base.Response{
+			StatusCode: base.StatusNotFound,
+		}, nil, nil
+	}
+
+	return &base.Response{
+		StatusCode: base.StatusOK,
+	}, stream, nil
+}
+
+// called when receiving a PLAY request.
+func (s *server) OnPlay(ctx *gortsplib.ServerHandlerOnPlayCtx) (*base.Response, error) {
+	log.Printf("play request")
+
+	return &base.Response{
+		StatusCode: base.StatusOK,
+	}, nil
+}