[PATCH 3/6] dsound: create a primary_pwfx separately from pwfx

[Andrew Eikum]

Patches 1 and 2 in this series look fine.

I have a series of patches similar to this one in my dsound
multichannel branch. This patch seems to do too much at once.

When I did this cleanup, I split it up into four patches:
1) Allocate the device format in the Device struct
2) Load the default format from the IAC, not hard-coded in dsound
3) Put SetFormat() calls into their own WFX that we don't really care
about
4) Always use WAVE_FORMAT_EXTENSIBLE for the device format

Much more bisect-able that way. I've attached a tarball here. It's not
submission-quality yet (I haven't reviewed it lately; it might not
even work), but it should show you what I had in mind for this kind of
cleanup.

I can bump those up in priority, but I don't think this blocks patches
4-6 in this series anyway.

Andrew
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