On Wed, Oct 05, 2016 at 03:43:02AM +0200, Neels Hofmeyr wrote:
b) just reverted the libortp version bumping commit in libosmo-abis (15d9b7929d449e4138bcb003c614035bceadc3d1) Everything compiles and works out, but alas, I get constant very weird distortion/blip-tones/hickups on the voice channels, a bit of voice still audible but definitely some bad codec problem. A regression?
I have identified voice to be broken on sysmobts-v2 starting from this osmo-bts commit:
commit 654175f33bd412671e3ef8cdd65c0689d10f278c Refs: 0.4.0-281-g654175f Author: Max msuraev@sysmocom.de AuthorDate: Sat Sep 17 14:15:03 2016 +0200 Commit: Max msuraev@sysmocom.de CommitDate: Sat Sep 24 15:09:31 2016 +0200
DTX: check Marker bit to send ONSET to L1
If Marker bit is set than it's a talkspurt which we have to explicitly indicate to L1 by first sending ONSET message and than actual voice data in a separate message.
This change affect sysmobts and LC15 hw.
Change-Id: I88c41568bcb0d82699f617adc4ad192603dd1bb6 Related: OS#1750
Going back with osmo-bts to one before this commit fixes all problems with both 1.5.3 SDK versions tested:
poky-eglibc-i686-meta-toolchain-osmo-armv5te-toolchain-osmo-1.5.3-20160323112523.sh poky-eglibc-i686-meta-toolchain-osmo-armv5te-toolchain-osmo-1.5.3-20160910200558.sh
However, the 1.5.4 SDK still produces only noise. It has a newer libortp, and note that the litecell15 instructions include a choice of libortp 0.16.5, explicitly *not* a newer version, so it might be related to that.
To summarize, to have a working setup on sysmobts, I still need to: - use a 1.5.3 SDK - libosmo-abis: git revert 15d9b7929d449e4138bcb003c614035bceadc3d1 - osmo-bts: git checkout eb08a87be52bf55a78c12689f1e5c7cff627cbbc
GPRS is not affected, works well with all of the above (except for the old two-phase-access OS#1756 issue).
Maybe I'll figure out how to compile the mbedtls into the 1.5.3 SDK or build without mbedtls, allowing a newer libortp: if voice is reduced to noise by that, we would know whether libortp's HEAD has a problem for us.
~Neels