[PATCH RFC 2/5] dsound: Replace convert() functions with get() and put()

[Alexander E. Patrakov]

This is the second patch in a series of cleanups that I prepared for
dsound in order to ease the development of a new resampler. As the
subject says, it simplifies the sample depth conversion by always
using float as the intermediate format.

The patch works for me, but it would be nice to also convert volume
operations to floating point, and do them on a temporary mixing buffer.
This is not done yet.

-- 
Alexander E. Patrakov
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