Make the segments bigger (1 second) as it seems to be the minimum size
we need to not introduce noise.
Sink works in my nexus 7 with rates from 8000 to 44100 and some noise
can be noticed on higger sample rates.
Add some log messages.
Fixed a bit the _player_cb function and properly advance reding in the
ringbuffer.
Still produces noise when the ringbuffer wraps.