[wdmaudiodev] Re: Generic Virtual MIDI-driver...
- From: stevejet@xxxxxxxxxxxx
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Mon, 23 Mar 2009 13:13:13 -0400
Hello Tobias,
I have just written a driver similar to this to replace the earlier one I
mentioned in my post of March 2nd.
The driver provides 1 MIDI input port (omni) and 2 MIDI output ports (32
channels) for the sequencer. My DXi host feeds the input port and renders the
output ports using buffers written and read using METHOD_BUFFERED IOCTLs.
I hope that you get help from the experts, but if not, I'll do what I can.
Regards,
Steve.
-----Original Message-----
From: Tobias Erichsen <erichsen@xxxxxxxxxxxxx>
To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Mon, 23 Mar 2009 12:25
Subject: [wdmaudiodev] Generic Virtual MIDI-driver...
Hi everyone,
like I wrote in my last mail from Friday I would highly welcome a
complete MIDI-driver-
sample that implements the following functionality:
- Software-only (like MSVAD)
- Private interface for applications (either by custom KS properties or
private IOCTLs)
- Dynamically creatable/destroyable MIDI-ports with freely configurable
friendly-name
without the need for any reboots
- the created MIDI-Port is accessible to all kinds of standard
application through
the standard interfaces like "old-school" MME API, DirectX...
- The "backend" / "virtual-hardware" side of the MIDI-port is
implemented by the application
(if someone needs some clarification on how this would work, I can
provide with a more
thorough description)
This kind of driver would allow for all kind of cool functionality:
- DAW-applications could create MIDI-ports on demand to interface to
other stand-alone
applications for MIDI-message-exchange
- Special-operation MIDI-port(s) can be created by just writing a simple
user-space application
or service. Making a multitude of functions possible like:
- MIDI-over-NET tunneling
- MIDI-patchbays
- MIDI-filters
Apart from the "real-world" uses, the driver-writer-community has some
benefits as well
- For many applications the need of writing a driver would be eliminated
totally!
- Serve as a blueprint for other driver-writers on how to implement this
functionality
- Functionality that has not been that well documented (like dynmaic
creation of ports,
dynamic friendly-names etc.) can be deduced rather easily by browsing
this sample.
It would by highly convenient if such driver could be incorporated into
the standard-shipment
of the next Windows OS version.
In the last couple of years (and especially in the last months) a large
number of companies &
individuals have asked many times for information about writing drivers
which each implement
some of the functionality I have sketched out above - having a generic
driver which implements
the sum of all those request would really bring forward the
DAW-community (both on the developer
& on the user side)
I would be willing to start up such an endeavor but I must admit that
apart from having written
several device-drivers (in other areas) already, I have no intimate
knowledge about the imple-
mentation of the kernel-streaming-mechanisms on the driver side - so any
help from other
interested parties would be highly welcome. Especially the area of
private-interfaces and
dynamic creation/destruction of ports with a free friendlyname is
something that is still
a closed book to me...
I have thought about a driver that would be called VMIDI.SYS
implementing the functionality
described above and also having a matching DLL: VMIDI.DLL which creates
an easy to use user-
space DLL for applications to interface to this driver in a
standard-way.
So any feedback on this subject is highly welcome (hopefully some of the
folks who have
asked for such stuff in the past are still monitoring this mailing-list
to get feedback
if this contemplated driver would implement most/all of what they were
trying to achieve :-)
Best regards,
Tobias
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