This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://email@example.com/.Harald Welte laforge at gnumonks.org
Hi Aegean, On Sat, Oct 22, 2011 at 07:32:20PM +0800, Aegean Chou wrote: > The osmocomBB no AMR support yet now (only FR, HR and EFR). this is correct. > i checked the product datasheet, the C123 can support AMR from > the beginning. does anyone can give me some information to > patch it? AMR in general is relatively complex, at least at least if you want to implement it in a compliant way. There is not only the 'adaptive' aspect, i.e. the negotiation of different codec modes with CMR/CMI/CMC and the associated CmiPhase, but also the RATSCCH signalling for TFO. Furthermore, the situation gets slightly more complicated as the Calypso DSP ROM firmware apparently doesn't support AMR out-of-the-box but needs some DSP code patches. While we already have support for applying such patches, we don't have a license to distribute such patches, i.e. we cannot include them in OsmocomBB without being in copyright violation. So the correct way of implementing this is: * decide which DSP patch to use (from original firmware) * write a script that can extract it out of the original firmware image * include such a script in OsmocomBB * implement the DSP API / L1 related aspects for AMR in Calypso (by looking at TSM30 source code, or legal forms of reverse engineering the original firmware of e.g. a C123) If you would like to contribute patches/code for any of this work, we would be more than happy to review and merge them. Regards, Harald -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)