[Bug 14717] resampled sound is horrible

[wine-bugs at winehq.org]

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

--- Comment #206 from Alexander E. Patrakov <patrakov at gmail.com> 2011-11-05 01:19:32 CDT ---
Sorry, yesterday I referenced a cubic interpolation formula that is not good
for our task. Namely, it produces a cubic curve that passes through all four
given points. It is (when compared to the exact value) actually as noisy as the
linear interpolation, just changes the sign of the error.

A different formula gives a cubic curve that passes through the middle two
given points and also gives correct derivatives here, but doesn't pass through
the two outer points: http://www.paulinternet.nl/?page=bicubic (just below the
words "So our cubic interpolation formula becomes"). From the noise viewpoint,
it is much better.

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