Hi,
I am trying to use libcurl to manage rtsp streaming with a D-Link camera.
ONVIF streaming specification
(https://www.onvif.org/specs/stream/ONVIF-Streaming-Spec-v221.pdf)
introduced an audio backchannel feature .
A field 'require' is mandatory in DESCRIBE request as in this example:

    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

my question is: how can I add the field "Require:......." in DESCRIBE
request header?
Thanks for your help
JN Prigent

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Received on 2018-03-17