Attention is currently required from: fixeria, jolly, laforge. Hello Jenkins Builder, falconia, fixeria, laforge, I'd like you to reexamine a change. Please visit https://gerrit.osmocom.org/c/libosmocore/+/35131?usp=email to look at the new patch set (#2). The following approvals got outdated and were removed: Code-Review+1 by fixeria, Code-Review+1 by laforge, Verified+1 by Jenkins Builder Change subject: coding: gsm0503_tch_{afs,ahs}_encode(): add ability to emit BFI ...................................................................... coding: gsm0503_tch_{afs,ahs}_encode(): add ability to emit BFI Similar to Change ID Iade3310e16b906efb6892d28f474a0d15204e861, add BFI support to TCH AFS and TCH AHS encoder. Every BTS needs to have some graceful handling for the scenario where it is time to send out a speech frame on TCH DL, but there is no frame to be sent. One possible solution is to transmit dummy FACCH, but this option is unattractive for TCH/AHS where FACCH displaces two speech frames rather than one. A more elegant solution is to emit a speech frame with inverted CRC6, causing the MS receiver to declare a BFI condition to trigger substitution and muting procedure. Setting all u(k) bits to 0 is one way to produce such an inverted-CRC speech frame (normal TCH FR/HR CRC6 for an all-zeros frame would be 111111). This patch adds the abiliy to gsm0503_tch_{afs,ahs}_encode() functions, indicated by payload length of 0. See §6.2 of 3GPP TS 26.191 for substitution and muting procedure. Related: OS#6049 Change-Id: I82ce2adf995a4b42d1f378c5819f88d773b9104a --- M src/coding/gsm0503_coding.c 1 file changed, 171 insertions(+), 58 deletions(-) git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/31/35131/2 -- To view, visit https://gerrit.osmocom.org/c/libosmocore/+/35131?usp=email To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: libosmocore Gerrit-Branch: master Gerrit-Change-Id: I82ce2adf995a4b42d1f378c5819f88d773b9104a Gerrit-Change-Number: 35131 Gerrit-PatchSet: 2 Gerrit-Owner: jolly <andreas(a)eversberg.eu> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: falconia <falcon(a)freecalypso.org> Gerrit-Reviewer: fixeria <vyanitskiy(a)sysmocom.de> Gerrit-Reviewer: laforge <laforge(a)osmocom.org> Gerrit-Attention: jolly <andreas(a)eversberg.eu> Gerrit-Attention: laforge <laforge(a)osmocom.org> Gerrit-Attention: fixeria <vyanitskiy(a)sysmocom.de> Gerrit-MessageType: newpatchset