It is a good practice to constify pointers when their dereferenced
data is not modified within the functions or its descendants.

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This will make refactoring features easier, especially now that
pthreads support and larger refactorings are on the horizon.

Hopefully, this will make porting to other platforms (even
non-UNIX-like ones for masochists) easier, too.

os_compat.h will house all the #includes for system headers
considered to be the "core" of MPD.  Headers for optional
features will be left to individual source files.

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because lsr may return less than the input buffer size, and the rest of the
audio code needs to know the new size.  This fixes the clicking that was
introduced with recent changes to the lsr code.  A huge thanks to remiss
for figuring this out.

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audio at once, so it won't work for us.  The old full API code was still
heavily broken, as each call to pcm_convertSampleRate() used the same
state, even if it was processing two streams of audio.  The new code keeps
a separate state for each audio stream that's being converted.

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and samplerate conversion.  This makes the code much easier to read, and
fixes a few bugs that were previously there.

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Indent the entire tree, hopefully we can keep
it indented.

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Cleanup whitespace->tabs

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the GPL header where necessary

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now to just write the actual audioFormat conversion code!

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