[wdmaudiodev] writing to a midi pin in user-mode
- From: Ben Allison <benjamin.james.allison@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 5 Nov 2004 23:18:52 -0500
Hi,
I'm fairly new to kernel streaming. I am trying to write code to
output midi to a midi device (in this case, the Microsoft GS Wavetable
Synth).
I've successfully queried all the devices, opened the filter to the
device, identified the midi pin, and gotten a handle to the pin it
from KsCreatePin. (my KSDATAFORMAT after KSPIN_CONNECT has a subtype
of MIDI, not directmusic)
However, I can't seem to write to it. I get the error "The supplied
user buffer is not valid for the requested operation".
I'm passing a KSSTREAM_HEADER with the following:
Size = 48
TypeSpecificFlags = 0
PresentationTime = Time=0 Numerator = 1 Denominator = 1
Duration = 0
FrameExtent = 36
DataUsed = 12
Data = (16 byte aligned pointer)
OptionsFlag = 0
my data is just a simple midi message
KSDATAFORMAT_MUSIC header:
TimeStampMs = 0
Bytes = 3
(data following) = 4 bytes, 0x00404090 (note on, note 64, velocity 64,
0 padding)
I'm passing in an OVERLAPPED for getting signalled later.
What am I doing wrong? Why is DeviceIoControl rejecting my buffer?
-Ben Allison
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