Yes (not alsa-specific but less speex-specific),
Outside of the spx_int* types, what are the speex-specific bits that bother you?
once if it's merged to alsa-lib tree. (The code can't be applied to the tree as it is, BTW, because it must be LGPL, as we discussed...)
Is a COPYING file OK or do you need headers (in which case, what's the smallest header that can be added?)?
Yes, but if the code is in another tree, it's actually a fork. Having codes that may be frequently changed in multiple places is already a risky action from the maintenance POV, regardless of the coding style. That's what I'd like to avoid.
Then the solution would be to just copy from the Speex tree once in a while and get the fixes there first. You can always have an automated formatting tool that you run after importing a new version. Overall, I really see no reason why you'd want to modify the resampler in the first place -- other than fixing bugs, which should go in the Speex tree anyway.
Jean-Marc