[Bug 29299] Lords of the Realm 2: in-game videos missing audio

http://bugs.winehq.org/show_bug.cgi?id=29299

--- Comment #6 from Andrew Eikum  2012-01-23 11:32:05 CST ---
Created attachment 38513
  --> http://bugs.winehq.org/attachment.cgi?id=38513
Pre- and post-pads for winealsa

Here's two simple patches which fix both the tiny amount of data problem and
the last period not full problem. They're pretty obvious: if there won't be a
full period in ALSA before we write, we pre-pad with silence. If there is no
data left to write after writing and there isn't a multiple of a full ALSA
period in the ALSA buffer, then we write silence to fill out that last period.

I'm concerned about how the second patch affects nearly-empty buffer situations
like Bug 28723. I think it should work, but it makes us slightly less tolerant
of very low data scenarios (or does it? perhaps ALSA will glitch anyway as it
pulls that half-period).

Perhaps I should add TRACEs to these new codepaths...