Dear all,
In NS2, the packet header must be accessed through its offset. But I can
not find where the offset_ is initialized. Please look and see if my
understanding of this issue is right or not:
In the RTPAgent, it is directly use hdr_cmn::access(p) to access the
header part. When the RTPAgent is configured in TCL, a binding is made to
connect the RTP header's offset to the "offset_" of struct "hdr_cmn".
Therefore, through the forced type conversion "return (hdr_rtp*)
p->access(offset_);" (in ns/apps/rtp.cc, and p is a pointer to a new Packet
instance), the "offset_" in hdr_rtp (which is a child of hdr_cmn) is
initialized to the value configured through TCL.
Thank you.
