[Openal] ADPCM support

[Mike Armstrong]

Hi

Having downloaded the source and had a good look around, it seems that 
ADPCM support amounts to the decompression of
data uploaded to a buffer via alBufferData.  Many moons ago (2003ish)  
there was talk of the adpcm data decompressing on
the fly and having looked at the FillBuffer code within alc.c this seems 
very possible given the quick decompression of adpcm and short
(1sec dsound buffer).
Is there still a plan to resurrect this task as it would removed the 
need to manage many queued buffers via a polling system for
anyone wanting to conserve memory/space by using adpcm on common 
shortish sounds?

I did think of another method of only creating buffers as they were 
require via a simple caching scheme, however the main advantage of the
FillBuffer method would be that it would spread the load of 
decompression over several frames for longer than 1sec sounds.

many thanks

mike