dmusic: framework for file loading

[Raphaël Junqueira]

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Hi rok ;)

> 	As I've mentioned, we'll need a function for loading chunks from dmusic
> files. I tried to write one, and here's result; it's not very nice, but
> it works (sort of).
> 	At the time being, it only "loads" and displays data
> (--debugmsg=+dmfile for debug and --debugmsg=+dmfiledat for the display
> of data). I couldn't make it load data into IDirectMusic*Impl
> interfaces, because whatever I did, exception occured (maybe someone
> more familiar with this could do this (Raphael?)). Also, if someone has
> more robust and simpler function, please tell me.
> 	DMUSIC_FillSegmentFromFileHandle loads sample.sgt from DX SDK
> completely... however, i didn't try the other.

Impressive work ;)

> 	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 ;)

for what i understand, this code must be the correct one:
if (!ppDirectSound)
	  IDirectSound_Release(This->dsound);

> I don't know why, but it causes exception (i've commented it).

well Releasing a NULL object ;)

>
> ChangeLog:
>    - wine/dlls/dmusic/dmusic_private.h: added some new structs
>    - wine/dlls/dmusic/dmusic_loader.c: load file
>    - wine/dlls/dmusic/dmusic_preformance.c: minor fix
>    - wine/dlls/dmusic/helper.c: new file with file loading functions

Regards,
Raphael
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