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Neels Hofmeyr nhofmeyr at sysmocom.deOn 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 at sysmocom.de>
AuthorDate: Sat Sep 17 14:15:03 2016 +0200
Commit: Max <msuraev at 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
--
- Neels Hofmeyr <nhofmeyr at sysmocom.de> http://www.sysmocom.de/
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