The frame duration was calculated without taking in account the
bytes per sample.

Thanks to Lorenzo Pistone <blaffablaffa@gmail.com> for pointing
the issue and providing an initial fix.

It currently use the simple api and is using the latency information
provided only to offset the stream start.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Cleanup the options and add explicit fragment_size avoption.

This should be changed to LIBAVDEVICE_IDENT once it exists.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

It currently use the simple api and is using the latency information
provided only to offset the stream start.