[Bug 14717] resampled sound is horrible

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=14717

--- Comment #223 from Alexander E. Patrakov <patrakov at gmail.com> 2011-11-08 10:20:10 CST ---
Created attachment 37381
  --> http://bugs.winehq.org/attachment.cgi?id=37381
My patchset, after some more cleanups

I have split the channel handling and added comments to all fixed-point math.
If you want even less bitshifting, I can convert the added code to
floating-point math, as in your old patch.

The patch about freqAccNext -> freqAcc change is also incorporated. With this
change, freqAccNext becomes almost unused, and it would be a good cleanup to
kill it.

The patchset works for me and matches the default Windows XP resampling
quality, but eats ~18% CPU for 44100 -> 48000 Hz resampling. This is the price
to pay for the quality that is better than provided by the resamplers on linux
desktops at the default settings, and for the lack of any MMX/SSE optimizations
found in other resampling libraries.

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