[wdmaudiodev] Re: What is different from w2k to XP in the WaveOut/In API?
- From: "Jeff Claar" <jclaar@xxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 1 Aug 2003 15:06:28 -0700
No...it's WAVEOUTCAPS2 and WAVEINCAPS2 (not to mention MIDIINCAPS2, AUXCAPS2,
etc). Look in the MSDN docs for the article "Extended Capabilities from a WDM
Audio Driver" at:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/stream/hh/stream/pcdesign_4js7.asp
Jeff
----- Original Message -----
From: Uwe Kirst
To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Friday, August 01, 2003 6:02 PM
Subject: [wdmaudiodev] Re: What is different from w2k to XP in the WaveOut/In
API?
Hi Jeff,
doe you mean WAVEOUTCAPSW / WAVEINCAPSW? I think the length should be 84 / 80
Bytes, at least this is what I know from w2k. That corresponses with use of
wide-characters. Does XP use 8-Bit characters or is there another extension I
don't know?
Uwe
Jeff Claar schrieb:
Hi Uwe, Could you be receiving a WAVEOUTCAPS2 or WAVEINCAPS2 structure? You
don't say what the length of the buffer is, but it sounds like that might be
it, especially since this only happens on XP, which is the only OS that
supports those structures. Jeff
----- Original Message -----
From: Uwe Kirst
To: wdmaudiodev@xxxxxxxxxxxxxxxxx: Friday, August 01, 2003 5:29 PMSubject:
[wdmaudiodev] What is different from w2k to XP in the WaveOut/In API?
Hi,
because there are so many known kmixer bugs and limitation I started to
write a wrapper dll that bypasses the the kmixer. It implements the good
old mme Wave API and is based on the direct KS sample. My dll has the
following advantages:
-no additional latency introduced, because audio data is not copied.
-no format and sample rate conversations, audio data provided as it is.
-no 10/32 device limit.
-full 32 and 24 bit support (32/24 bit support has been removed in XP
(e.g.:samplitude plays 32 bit data in w2x, does not play in 32 bit in
XP))
The dll works quite well in w2k, but I'm still having some trouble with
XP. That's why I'm asking for help. I'm having some strange effects
while debugging the dll under XP:
I see a lot of WODM_GETNUMDEVS, WIDM_GETNUMDEVS, WODM_GETDEVCAPS,
WIDM_GETDEVCAPS messages, more than I expect from the number of devices
I support. It seems that the system calls these messages in an more or
less endless loop. The WOM_GETDEVCAPS and WIDM_GETDEVCAPS have two
parameters: dwparam1, dwparam2. The first parameter is a pointer to the
memory that should be filled with the devicecaps. The second parameter
is the length of the devicecaps which should be 80 or 84 depending on
the direction. From the debugprints I can see that the second parameter
most of the time is not 80 or 84 but a number >> 84. If I copy the
devicecaps in that case, the application that uses the waveapi crashes.
The windows explorer or the messenger also crashes during installation
in that case. If I do not copy the devicecaps in that case the
devicename in the application is left blank (depending on the
application I use) or shows some other error message. I see also much
more blank lines or error message than devices I have installed. The
windows control panel shoes the correct number of devices and
devicenames. To be sure that all these effects does not have anything to
do with DirectKS I skipped DirectKS device enumeration and used constant
values for the number of devices and devicecaps structures.
Does anyone have a clue?
Thanks
Uwe
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