The present source repository is intended to be a collection of C libraries
(each at least conceptually independent and free-standing) providing
functionality in a spirit similar to the venerable libgsm (GSM 06.10
implementation) from 1990s.  The following libraries are currently envisioned:

libgsmfrp	A preprocessor to be invoked prior to gsm_decode() from classic
		libgsm, implementing GSM 06.11, 06.12 and 06.31 functionality
		in the Rx direction.

libgsmefr	An implementation of EFR codec in the same spirit as classic
		libgsm, i.e., like libgsm, but for EFR instead of 06.10.  It
		will be based on the reference code from ETSI.

libgsmamr	A similar deal for AMR, only a fuzzy idea currently.