Fix buggy SDP from D-Link cameras #771

pkg/rtsp/helpers.go

@@ -52,6 +52,9 @@ func UnmarshalSDP(rawSDP []byte) ([]*core.Media, error) {
 		}
 	}
 
+	// fix buggy camera https://github.com/AlexxIT/go2rtc/issues/771
+	forceDirection := sd.Origin.Username == "CV-RTSPHandler"
+
 	var medias []*core.Media
 
 	for _, md := range sd.MediaDescriptions {
@@ -65,7 +68,7 @@ func UnmarshalSDP(rawSDP []byte) ([]*core.Media, error) {
 			}
 		}
 
-		if media.Direction == "" {
+		if media.Direction == "" || forceDirection {
 			media.Direction = core.DirectionRecvonly
 		}
 

pkg/rtsp/rtsp_test.go

@@ -132,3 +132,30 @@ a=control:track3
 	assert.Nil(t, err)
 	assert.Len(t, medias, 3)
 }
+
+func TestBugSDP5(t *testing.T) {
+	s := `v=0
+o=CV-RTSPHandler 1123412 0 IN IP4 192.168.1.22
+s=Camera
+c=IN IP4 192.168.1.22
+t=0 0
+a=charset:Shift_JIS
+a=range:npt=0-
+a=control:*
+a=etag:1234567890
+m=video 0 RTP/AVP 99
+a=rtpmap:99 H264/90000
+a=fmtp:99 profile-level-id=42A01E;packetization-mode=1;sprop-parameter-sets=Z0KgKedAPAET8uAIEAABd2AAK/IGAAADAC+vCAAAHc1lP//jAAADABfXhAAADuayn//wIA==,aN48gA==
+a=control:trackID=1
+a=sendonly
+m=audio 0 RTP/AVP 127
+a=rtpmap:127 mpeg4-generic/8000/1
+a=fmtp:127 streamtype=5; profile-level-id=15; mode=AAC-hbr; sizeLength=13; indexLength=3; indexDeltalength=3; config=1588; CTSDeltaLength=0; DTSDeltaLength=0;
+a=control:trackID=2
+`
+	medias, err := UnmarshalSDP([]byte(s))
+	assert.Nil(t, err)
+	assert.Len(t, medias, 2)
+	assert.Equal(t, "recvonly", medias[0].Direction)
+	assert.Equal(t, "recvonly", medias[1].Direction)
+}