[Bug 779860] alsa: use pow2 for performance

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779860

--- Comment #2 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
While at it, the description is a bit long, try and synthetise, and add a long
description.

alsa: Short desc
<empty line>
long desc

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