Some dmusic questions

[Rok Mandeljc]

Today I did some "tests" with dmusic; I've tried to run dxdiag with
mixture of builtin and native dm*.dll and I have some questions based on
observations:

1. dm*.dlls don't share DllGetClassObject function like I did in wine's
implementations (dm*.dlls other than dmusic.dll have their functions
forwarded to dmusic.dll). Shall we implement such separation or shall we
leave it as it is? (personally, I'd choose separation because then
mixing dlls would be more efficient; at the moment, all dm*.dlls call
dmusic.DllGetClassObject, which mean I must replace all of them with
native equivalents if I want to replace dmusic.dll; besides, dxdiag
crashes in a mysterious way with builtin dlls and I expect the problem
lies here).

2. when listing dmusic ports, dmusic calls EnumLegacyDevice, which is
stub, because I can't find any info about it's parameters... It calls
some winemm stuff and lists Wine midi out mapper, although it can't be
used. It is obvious that it lists devices that could be used as ports,
except Microsoft Software Synthesizer, which is available only if native
dmsynth.dll is used (i used native dmusic.dll). Any ideas where I could
get more detailed info about what does this funct. do and what
parameters it takes?

3. this one concerns RIFF loading stuff I've been working on recently.
MSDN states that IStream and IPersistStream insterfaces should be used
in parsing data, which means all functs. in helper.c are wrong. I'll
look deeper into docs and try to find out how it's supposed to go (just
expect that all functs. will be replaced so do not modify them ;=) ).

Rok Mandeljc  writes:
> - this one concerns RIFF loading stuff I've been working on recently.
>
> MSDN states that IStream and IPersistStream insterfaces should be used
> in parsing data, which means all functs. in helper.c are wrong. I'll
> look deeper into docs and try to find out how it's supposed to go (just
> expect that all functs. will be replaced so do not modify them ;=) ).

The avifile/avifil32 library also says to implement the IPersistStream
interface, which I have implemented some time ago. But the avifile API
only uses the Load method, because the Save* methods are not sufficent
for the API.

Michael