Dear sir,
I am implementing bidirectiotnal audio connection based on the ONVIF specification.
But ONVIF spec use a extension of RTSP. I couldn't implement it with live555.
The procedure is simple as below.
========== Server with onvif backchannel support ===========
Client – Server:
DESCRIBE rtsp://192.168.0.1 RTSP/1.0
CSeq: 1
User-Agent: ONVIF Rtsp client
Accept: application/sdp
Require: www.onvif.org/ver20/backchannel
Server – Client:
RTSP/1.0 200 OK
CSeq: 1
Content-Type: application/sdp
Content-Length: xxx
v=0
o= 2890842807 IN IP4 192.168.0.1
s=RTSP Session with audiobackchannel
m=video 0 RTP/AVP 26
a=control:rtsp://192.168.0.1/video
a=recvonly
m=audio 0 RTP/AVP 0
a=control:rtsp://192.168.0.1/audio
a=recvonly
m=audio 0 RTP/AVP 0
a=control:rtsp://192.168.0.1/audioback
a=rtpmap:0 PCMU/8000
a=sendonly
=========== setup session =============
Client – Server:
SETUP rtsp://192.168.0.1/audioback RTSP/1.0
CSeq: 4
Session: 123124
Transport: RTP/AVP;unicast;client_port=6296-6297
Require: www.onvif.org/ver20/backchannel
Server – Client:
RTSP/1.0 200 OK
CSeq: 4
Session: 123124;timeout=60
Transport:RTP/AVP;unicast;client_port=6296-6297; server_port=2346-2347
=========== play session =============
Client – Server:
PLAY rtsp://192.168.0.1 RTSP/1.0
CSeq: 5
Session: 123124
Require: www.onvif.org/ver20/backchannel
Server – Client:
RTSP/1.0 200 OK
CSeq: 5
Session: 123124;timeout=60
=========== RTP communication =============
Then last media subsession should send audio data to server without receiving any rtp data.
I refer the openRTSP source code, and can implement a client for video/audio streaming.
Could you advice me how i can implement bidirectional audio streaming?
Regards,
Hyunho Kim.
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