Makes complete sense Patrick. I will get to the bottom of if and keep you
posted!
Thanks,
-Greg
From: Patrick Wakano [mailto:pwak...@gmail.com]
Sent: Tuesday, October 18, 2011 7:22 AM
To: Greg Horton
Cc: sipp-users@lists.sourceforge.net
Subject: Re: [Sipp-users] Need to change video port offset from auto_media_port
I can't tell you for sure what is happenning because I haven't gone in the
sources that deep, but the overview is that in prepare_pcap.c it reads your
pcap data and store it in some buffer and in send_packets.c it gets your data,
packs in UDP/RTP and sends it to the wire, so I recommend you to study these
two files to understand the full process!
By having a quick look in the code I found this in send_packets() func:
while (pkt_index < pkt_max) {
memcpy(udp, pkt_index->data, pkt_index->pktlen);
port_diff = ntohs (udp->uh_dport) - pkts->base;
// modify UDP ports
udp->uh_sport = htons(port_diff + *from_port);
udp->uh_dport = htons(port_diff + *to_port);
....
so my guess is that you have to handle this port_diff, since it seems to be
calculated from the packets of your pcap, as you have observed!
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