mgcp: Attempt to count missing RTP packets with a basic calculation
This code compares the UDP sequence numbers of two RTP messages
and guesses if packets are missing. It is guessing in two ways:
1.) by default the sequence number is 0, so on the first
value we ignore the jump... we might ignore a real issue
in case of a wrap around which is easily possible as the
sequence should be a random number.
2.) the UDP stream might have been reordered on the network
and we would see the jump...
In any case these two shortcomings are acceptable for the feature
that is meant to provide some basic analysis..
diff --git a/openbsc/src/mgcp/mgcp_protocol.c b/openbsc/src/mgcp/mgcp_protocol.c
index d82bd68..8131277 100644
--- a/openbsc/src/mgcp/mgcp_protocol.c
+++ b/openbsc/src/mgcp/mgcp_protocol.c
@@ -764,4 +764,7 @@
endp->in_bts = endp->in_remote = 0;
memset(&endp->remote, 0, sizeof(endp->remote));
memset(&endp->bts, 0, sizeof(endp->bts));
+
+ endp->net_seq_no = endp->bts_seq_no = 0;
+ endp->net_lost_no = endp->bts_lost_no = 0;
}