Experimental, Windows only. This is intended as an alternative to Creative's
router DLL, fixing a few issues with it (falsely reporting extensions that
aren't supported, not being able to query the ALC version without a device, and
not being able to use ALC extension functions).
When enabled OpenAL Soft's DLL is built as soft_oal.dll, while the router is
OpenAL32.dll.
I say "convert" because it takes the lazy way and essentially just embeds the
wrappers into the backend. It's done this way because I lack the means to check
any changes, even syntactically. This also means the device's ExtraData field
is still needed.
However, this does mean all the backends are now using the new API. Code
related to the old interface can now be removed.
Unfortunately PulseAudio has a habit of limiting tlength, and trying to
calculate the device's buffer length to write regardless of tlength could
result in some amount always being writable.
This needs to be handled more automatically by the mixer to work correctly.
Otherwise, requiring a property update on resume can put the source into a
playing state with the mixer never playing it, due to not having valid mixing
parameters and the mixing parameters not getting calculated because no updates
are specified by the app (and forcing an update can break deferred updates).
Similar to the recent chorus and flanger changes, the modulation delay now
swings between -n to +n, where n is less than the delay length. This brings up
a slight issue with the linear interpolation, as modff doesn't produce the
correct fraction value for interpolation (it's inverted, with 0 being closer to
the next sample and 1 being closer to the base). So it's using nearest
interpolation for now.
