Yes, I know what you mean,but my question is about this: >For outcoming traffic : >1/ read on TUN interface: you get one IP/UDP/RTP packet if I create a TUN, how to send a packet to a TUN with my application?For example, if my application create a RTP packet, without ROHC, I only need to use "sendto" to send this packet, but with ROHC, first I need to complete the RTP packet with IP/UDP header, then send this IP/UDP/RTP packet to TUN. If I don't want to constuct the IP/UDP/RTP packet myself,how to complete the RTP packet with IP/UDP header in another way?
2013/6/14 Didier Barvaux <did...@barvaux.org> > Hello 宋鑫, > > > About ROHC I would like to ask you for the call before compression of > > IP / UDP / RTP packet, how are the IP / UDP headers come from? > > For example, if do not use ROHC, we can directly send RTP packets to > > the peer through the UDP socket, use the "sendto" function which will > > automatically fix the packet with IP / UDP header > > But with ROHC, before send the ROHC packet I need to fix all headers. > > if use tun, the packet read from it is a complete IP packet, how to > > wirte a IP packet to the tun? > > I want to know how you solve this problem or similar problems > > For outcoming traffic : > 1/ read on TUN interface: you get one IP/UDP/RTP packet > 2/ compress the IP/UDP/RTP packet: you get one ROHC packet > 3/ write the ROHC packet as the UDP payload on the UDP socket: > one IP/UDP/ROHC packet is transmitted over the network > > For incoming traffic : > 1/ read on UDP socket: you get the UDP payload, ie a ROHC packet > 2/ decompress the ROHC packet: you get one IP/UDP/RTP packet > 3/ write the IP/UDP/RTP packet on TUN (you don't have to build the > IP and UDP headers, they come from the decompressed ROHC packet). > > Regards, > Didier > > _______________________________________________ > Mailing list: https://launchpad.net/~rohc > Post to : rohc@lists.launchpad.net > Unsubscribe : https://launchpad.net/~rohc > More help : https://help.launchpad.net/ListHelp > >
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