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path: root/src/osmo-bts-sysmo/tch.c
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2014-05-18sysmoBTS TCH: Set CMR in AMR RTP framesHarald Welte1-12/+7
Enable the previously commented-out logic to set the CMR (Codec Mode Request) in AMR RTP frames based on the CMI (CMR Index) of the AMR speech frame on the Um interface. This is of course anyway the right thing to do, but also required for an AMR receiver which doesn't have out-of-band information on the codec mode, and which also doesn't determine the AMR codec mode based on the size of the AMR frame (such as lcr as of current master). We also move the entire CMR generation into the #ifdef section which is only compiled-in if we do _not_ use the RTP mode of L1.
2013-12-28tch: Do not log every single RTP packet and air frameHolger Hans Peter Freyther1-9/+0
The sysmoBTS takes quite a bit of CPU time for the vfprintf that is used by osmo_hexdump. Do not dump every single frame to improve the performance a bit.
2012-04-19add vty-configurable loopback modeHarald Welte1-0/+40
this allows the BTS to loop-back any incoming data on a TCH
2012-04-18TCH: Add support for the L1 RTP modeHarald Welte1-13/+55
In L1 RTP mode, the L1 already does all the bit-shifting and re-ordering required for the RTP formats (which have different bit/nibble order than the ETSI/3GPP encodings, for some odd reason). We don't enable it by default yet, as only HR/FR/EFR work with it, but AMR has some yet to be debugged problem. Enabling USE_L1_RTP_MODE would save some CPU cycles on the ARM side.
2012-03-15update to new "superfemto.h" header file namingHarald Welte1-1/+1
2012-01-23misc: Check return value of msgb _alloc functionsHolger Hans Peter Freyther1-16/+55
Attempt to catch all functions that allocate a msgb and didn't check the return value of the allocation.
2011-11-29misc: Move the cmr_index into the #if 0 block as it is only used thereHolger Hans Peter Freyther1-1/+2
2011-11-07audio: Make bts_model_rtp_rx_cb compatible with the prototypeHolger Hans Peter Freyther1-4/+4
2011-09-07store the last SID frame of a given LCHAN so we can repeat itHarald Welte1-2/+50
repeating the last SID frame is required during 20ms intervals where we don't get a new SID update (SID RTP frames are valid up to 160ms)
2011-09-06user DRTP where appropriate, not DL1CHarald Welte1-8/+8
2011-09-06More comprehensive AMR handlingHarald Welte1-32/+62
* parse AMR multirate config form 04.08 IE into easier format * CMR, CMC and CMI on the L1 side are an _index_ into the current mode array * Fix conversion of AMR SID frames from RTP -> L1
2011-09-04AMR: double-check CMI/CMR/CMC valuesHarald Welte1-13/+59
We have to make sure that a phone cannot request codec modes which are not part of the active set...
2011-09-03Sysmobts L1: Implement HR codec supportHarald Welte1-3/+22
We don't really know if the HR encoding is compatible with other equipment, but it _should_ follow Chapter 5.2 of ETSI TS 101 318. Please note that RFC5993 also specifies a way to encode GSM-HR into RTP, we do not try to be compatible with that. The only difference seems to be one additional TOC octet at the beginning of the payload field.
2011-09-03Add new ORTP based libosmo-trau based voice supportHarald Welte1-2/+333
Using osmo-bts-sysmo and this code, it is now possible to do FR and AMR based voice calls on TCH/F. A lot of CPU is wasted in the conversion between the RTP formats and the L1 specific formats for the codec frames. All data needs to be shifted by four bits, and the order of bits needs to be reversed in every byte.
2011-07-24sysmobts: add a skeleton for codec frame processingHarald Welte1-0/+95
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