required to distinguish between 20-ms and 30-ms modes, both for encoding
and decoding
add support for the iLBC mode= format parameter and dynamic mode
switching
closes#854
Change-Id: Icb6f0ec80df86d27681c689c168b24f163a2db06
(cherry picked from commit 228d822a71)
the AMR (narrowband) decode test is unreliable as different AMR lib
versions give different results and the AVCODEC version test macros
aren't sufficient to differentiate between them
closes#549
Change-Id: I2eceb0a14b968be9cf7c62303a83fc958235e2dc