tree 0505d9d14085c61527a43bff36e3a9fcb42c1e95
parent eb282efa670148de9c27a000b1ff952a3681e2bd
author Neels Hofmeyr <neels@hofmeyr.de> 1538276480 +0200
committer Neels Hofmeyr <neels@hofmeyr.de> 1566264373 +0200

add simplistic IuUP FSM and strip/add IuUP headers

This should really be using the FSM in libosmocore/laforge/iu_up: take the best
of both sides and integate in the libosmocore FSM implementation, then use it
here.
- in libosmocore, the FSM definition is nicer.
- here, we have correct header checksums.

Introduce using msgb to receive, pass and send RTP packets.

Add/strip IuUP from RTP data (for which msgb is particularly useful).

The payload type on an IuUP conn is maintained as negotiated in the IuUP
Initialization. For the pure RTP side, an SDP "AMR" ptmap attribute is looked
up, so that payload type numbers are translated between IuUP <-> RTP.

Change-Id: Ibc70e0aa00476926dd1f4ea8139c34f31f9cdfa3