dmusic: framework for file loading

[Raphaël Junqueira]

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Hi,

> Indeed, good job! ;-)
;)

> >>	Also "fixed" a problem I've encountered while running 3DAudio.exe (from
> >>SDK). One of the latest patches added this clause:
> >>
> >>if (!ppDirectSound)
> >>	IDirectSound_Release(*ppDirectSound);
> >
> >well, seem another christian regression ;)
>
> ;-)
> I suppose the first regression is the crash when DirectSoundCreate
> failed when no driver is selected in the config file... :-)
> In that case, I was thinking to myself if we should be able to create
> DirectPerformance or DirectMusic objects or not.
> If so, Init and InitAudio functions should failed with an error.
> The error value could be DSERR_NODRIVER, E_NOINTERFACE or
> DSERR_UNINITIALIZED.
> Any idea?

Well i don't know the real behavior of dx (we need to test it on a real 
windows without a soundcard) but Unreal2 seems to need DMusic and 
DMmusicPerformance objects with and without sound support.
For what i have tested it's only the DMmusicPerformance who can't return 
anything without dsound drivers (DSERR_NODRIVER).

Regards,
Raphael
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