Attention is currently required from: falconia, pespin.

fixeria has posted comments on this change by falconia. ( 
https://gerrit.osmocom.org/c/osmo-bts/+/38553?usp=email )

Change subject: CSD: implement half-rate modes correctly
......................................................................


Patch Set 2: Code-Review+1

(5 comments)

Commit Message:

https://gerrit.osmocom.org/c/osmo-bts/+/38553/comment/f55d153e_392cfca0?usp=email
 :
PS2, Line 26: by emitting two RTP packets
            : directly back-to-back for UL, and pulling two RTP packets at a 
time
            : from the Rx jitter buffer at the needed times for DL.
I understand your idea now. Just curious, how would you do that if osmo-bts 
were an E1 BTS (not Abis-over-IP)? I guess the only option would be to buffer 
V.110 frames, since you cannot do the same trick for a TDM interface.


File src/common/l1sap.c:

https://gerrit.osmocom.org/c/osmo-bts/+/38553/comment/7e6234ce_4292240f?usp=email
 :
PS2, Line 1493: /* TDMA frame number of burst 'a' % 26 is the table index.
> This bit of code is not newly written with this patch - I simply moved it 
> from osmo-bts-trx to the c […]
I agree with Mychaela here. It's a well known constant that is used quite often 
here and there.


https://gerrit.osmocom.org/c/osmo-bts/+/38553/comment/5aa500ad_532f6eb5?usp=email
 :
PS2, Line 1539: 2
`ARRAY_SIZE(input_msg)` here and below, please.


https://gerrit.osmocom.org/c/osmo-bts/+/38553/comment/d0770a5a_b08f40ee?usp=email
 :
PS2, Line 1556: else
I would put a comment that it's an IDLE frame (all bits set to 1).


https://gerrit.osmocom.org/c/osmo-bts/+/38553/comment/8879c982_8934bcf2?usp=email
 :
PS2, Line 2098: switch (lchan->tch_mode) {
As a further improvement, I suggest sharing `csd_v110_lchan_desc[]`, so that it 
can be used here (`desc->num_blocks * desc->num_bits`). I have a WIP patch 
moving that lookup table to libosmocore: 
https://gerrit.osmocom.org/c/libosmocore/+/35914.



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Gerrit-Change-Number: 38553
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