Fix RTSP server SDP for some clients

cmd/rtsp/rtsp.go

@@ -162,6 +162,8 @@ func tcpHandler(conn *rtsp.Conn) {
 
 			log.Debug().Str("stream", name).Msg("[rtsp] new consumer")
 
+			conn.SessionName = app.UserAgent
+
 			initMedias(conn)
 
 			if err := stream.AddConsumer(conn); err != nil {

pkg/rtsp/conn.go

@@ -78,6 +78,7 @@ type Conn struct {
 	// public
 
 	Backchannel bool
+	SessionName string
 
 	Medias    []*streamer.Media
 	Session   string
@@ -618,7 +619,7 @@ func (c *Conn) Accept() error {
 				medias = append(medias, media)
 			}
 
-			res.Body, err = streamer.MarshalSDP(medias)
+			res.Body, err = streamer.MarshalSDP(c.SessionName, medias)
 			if err != nil {
 				return err
 			}

pkg/streamer/media.go

@@ -183,8 +183,22 @@ func UnmarshalSDP(rawSDP []byte) ([]*Media, error) {
 	return medias, nil
 }
 
-func MarshalSDP(medias []*Media) ([]byte, error) {
+func MarshalSDP(name string, medias []*Media) ([]byte, error) {
-	sd := &sdp.SessionDescription{}
+	sd := &sdp.SessionDescription{
+		Origin: sdp.Origin{
+			Username: "-", SessionID: 1, SessionVersion: 1,
+			NetworkType: "IN", AddressType: "IP4", UnicastAddress: "0.0.0.0",
+		},
+		SessionName: sdp.SessionName(name),
+		ConnectionInformation: &sdp.ConnectionInformation{
+			NetworkType: "IN", AddressType: "IP4", Address: &sdp.Address{
+				Address: "0.0.0.0",
+			},
+		},
+		TimeDescriptions: []sdp.TimeDescription{
+			{Timing: sdp.Timing{}},
+		},
+	}
 
 	payloadType := uint8(96)
 

pkg/streamer/media_test.go

@@ -0,0 +1,23 @@
+package streamer
+
+import (
+	"github.com/pion/sdp/v3"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestSDP(t *testing.T) {
+	medias := []*Media{{
+		Kind: KindAudio, Direction: DirectionSendonly,
+		Codecs: []*Codec{
+			{Name: CodecPCMU, ClockRate: 8000},
+		},
+	}}
+
+	data, err := MarshalSDP("go2rtc/1.0.0", medias)
+	assert.Empty(t, err)
+
+	sd := &sdp.SessionDescription{}
+	err = sd.Unmarshal(data)
+	assert.Empty(t, err)
+}