[Bug 19523] winmm: Multiple waveOutOpen calls on single device supported by Windows, not Wine

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=19523





--- Comment #3 from Eric Pouech <eric.pouech at orange.fr>  2009-09-19 02:28:51 ---
of course, there is...

let's take the wave out driver interface as example:

DWORD WINAPI wodMessage(UINT wDevID, UINT wMsg, DWORD_PTR dwUser,
                        DWORD_PTR dwParam1, DWORD_PTR dwParam2);

in case wMsg in WODM_OPEN, dwUser is expected to be a pointer to a DWORD, that
the driver is supposed to filled with a unique instance ID (to identify the
stream)

in other (subsequent) messages, winmm passes in dwUser the unique ID defined by
the driver at WODM_OPEN time

winmm correctly supports this scheme (see MMDRV_Open in dlls/winmm/lolvldrv.c)

but, none of the wine drivers correctly initialize the dwUser while processing
the various XXXX_OPEN messages

it works as it is because most of the drivers only support a single instance,
hence any value for the unique ID will do

HTH

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