tree f93d11d8a26701cdecceebdf40b9fac006c8af03
parent 05c6feb71dd2f66b74c9e1671d91570485479836
author Tom Tsou <tom.tsou@ettus.com> 1440210778 -0700
committer Tom Tsou <tom.tsou@ettus.com> 1467367391 -0700

iface: Add inner ring-buffer implementation

Two buffers, inner and outer, are used in the transceiver
implementation. The outer buffer interfaces with the device receive
interface to guarantee timestamp aligned and contiguously allocated
sample buffers. The inner buffer absorbs vector size differences between
GSM bursts (156 or 157 samples) and the resampler interface (typically
fixed multiples of 65).

Reimplement the inner buffer with a ring buffer that allows fixed size
segments on the outer (resampler) portion and variable lengths (GSM
side) on the inner side. Compared to the previous stack-like version,
this implementation removes unnecessary copying of buffer contents.

Signed-off-by: Tom Tsou <tom.tsou@ettus.com>