[wdmaudiodev] Re: writing to a midi pin in user-mode
- From: "Alper Selcuk" <alpers@xxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 8 Nov 2004 09:17:26 -0800
FrameExtent seems to be wrong. Try this instead.
kd> dt 0x840c0f98 KSSTREAM_HEADER -r1
+0x000 Size : 0x30
+0x004 TypeSpecificFlags : 0
+0x008 PresentationTime :
+0x000 Time : 234196706
+0x008 Numerator : 1
+0x00c Denominator : 1
+0x018 Duration : 0
+0x020 FrameExtent : 0xc
+0x024 DataUsed : 0xc
+0x028 Data : 0x840c0ff0
+0x02c OptionsFlags : 0
kd> dd 0x840c0ff0
840c0ff0 00000000 00000003 000000b0 e5e5e5e5
kd> dt 0x840c0ff0 KSMUSICFORMAT
+0x000 TimeDeltaMs : 0
+0x004 ByteCount : 3
Alper Selcuk
This posting is provided "AS IS" with no warranties, and confers no
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-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Ben Allison
Sent: Friday, November 05, 2004 8:19 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] writing to a midi pin in user-mode
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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