Comments on: How should my program collect MIDI messages?

Question: How should my program collect MIDI messages?

springload — Sat, 13 Oct 2007 18:11:31 -0800

Where can I find enough info on Windows' MIDI API to start using it?

I have a Behringer controller with a "USB MIDI" interface (a USB cable goes straight from the box to the computer). I want to catch the messages sent from this unit in a Matlab program. There should be built-in support for this in Windows, but I don't find much documentation about it. Can someone please explain to me what DLL or ActiveX element to load, how to create a session, what functions to call and all the other details needed to see some MIDI messages on the screen?

By: teraflop

teraflop — Sat, 13 Oct 2007 18:38:26 -0800

If you want to access the MIDI API directly, the MSDN documentation is probably the best place to start. It looks like most of the functions you'll need are in winmm.dll.

I don't know how easy that will be to interface with Matlab, though; does it even support event-driven programming?

By: springload

springload — Sun, 14 Oct 2007 04:21:29 -0800

teraflop: With the basic DLL support, a native Matlab callback would likely be at least very hard to implement. The easiest thing for me would be a dll function that returns with the message as soon as it has arrived. Any recommendations for a wrapper that can do something like this?

By: moonmilk

moonmilk — Sun, 14 Oct 2007 07:07:59 -0800

Do you need to do this in realtime? If not, you could use any freeware midi-recording software to capture a .mid file. Then you can either parse the file in Matlab, or use a utility like MIDICSV or MIDI-Perl to convert the data to something easier for Matlab to read.

By: cmicali

cmicali — Sun, 14 Oct 2007 07:08:04 -0800

A quick googling for matlab midi brough up the Matlab Midi Toolbox .. might be worth looking into.

I'm not too familiar with matlab and what it supports, but C#/.NET is probably the easiest way to get started. seems fairly robust.

If you are ever working with MIDI, jglatt's resource center should be your #1 bookmark.

By: springload

springload — Sun, 14 Oct 2007 08:13:55 -0800

moonmilk: Unfortunately, this has to be done in realtime, message by message.

cmicali: I've snoped around jglatt's site, and it contains some nice information. .NET components can be accessed from Matlab, though I'm not sure how to go about it. A solution like that is one option, accessing winmm.dll from a MEX file (Matlab's C interface) is another one. Again, details and alternatives are most welcome - I'm very inexperienced with API interfacing.

By: springload

springload — Sun, 14 Oct 2007 14:32:48 -0800

Another possibility: Matlab can quite easily use Java classes. JavaSound seems to have useful MIDI functions, but I don't know where to find it. I tried to install a recent Java SDK, but I still can't find it. Should I look for a jar file with a different name?

By: plinth

plinth — Mon, 15 Oct 2007 06:32:03 -0800

I wrote some code 8 years ago to made the MIDI APIs available to Java on the PC. If you want, I'll dig out the source code for you. I never did any code for input, but if I recall correctly, the input routines are in the same family/region as the output routines.

By: springload

springload — Tue, 16 Oct 2007 14:31:16 -0800

For the record: I ended up using the COM interface of MIXI-OX. Thanks for the advice, everybody.