[S] Change in osmo-bts[master]: all models, HR1 codec: accept both TS101318 and RFC5993 formats

Attention is currently required from: laforge, pespin, dexter. falconia has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-bts/+/32968 ) Change subject: all models, HR1 codec: accept both TS101318 and RFC5993 formats ...................................................................... Patch Set 3: (1 comment) File src/common/rtp_input_preen.c: https://gerrit.osmocom.org/c/osmo-bts/+/32968/comment/309d817a_7126c5a6 PS3, Line 93: return PL_DECISION_STRIP_HDR_OCTET; Three-part answer: 1. The information content in the ToC octet is a SID vs non-SID indication, similar to the ternary SID flag of GSM 06.41 section 6.1, but with the invalid-SID state disallowed, keeping only valid-SID and non-SID. 2. At the present time there is no code anywhere in osmo-bts or even anywhere in Osmocom in general that does anything with this ToC octet other than ignore it. The old version of gsm0503_tch_hr_encode() function used by osmo-bts-trx would require 15-byte payload as input, yet never look at that extra byte. 3. I do have a plan (OS#6036) to start making use of the SID classification info passed in the ToC octet for DTXd logic of OS#5996, taking the work I already did for FR&EFR and extending it to support HR too. In this plan the rtp_payload_input_preen() function will produce one more output, a SID flag, and this flag will be passed down as an out-of-band datum like the current rtpmsg_marker_bit() mechanism. -- To view, visit https://gerrit.osmocom.org/c/osmo-bts/+/32968 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-bts Gerrit-Branch: master Gerrit-Change-Id: I702e26c3ad5b9d8347e73c6cd23efa38a3a3407e Gerrit-Change-Number: 32968 Gerrit-PatchSet: 3 Gerrit-Owner: falconia <falcon(a)freecalypso.org> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: dexter <pmaier(a)sysmocom.de> Gerrit-CC: laforge <laforge(a)osmocom.org> Gerrit-CC: pespin <pespin(a)sysmocom.de> Gerrit-Attention: laforge <laforge(a)osmocom.org> Gerrit-Attention: pespin <pespin(a)sysmocom.de> Gerrit-Attention: dexter <pmaier(a)sysmocom.de> Gerrit-Comment-Date: Thu, 25 May 2023 11:44:46 +0000 Gerrit-HasComments: Yes Gerrit-Has-Labels: No Comment-In-Reply-To: pespin <pespin(a)sysmocom.de> Gerrit-MessageType: comment