MIDI to OSC?

Hi marek ,

OSC Exchange will handle both directions, but the idea is that you have MidiFire on either side of the MIDI link converting the OSC to/from MIDI at either end.

If you want to convert MIDI events to OSC (and send over UDP), you can use StreamByter although it's a bit fiddly.

There is an example in the MidiFire manual under the StreamByter 'SEND' rule. Here it is:

IF LOAD
  # setup two OSC messages in W array
  ASS W00 = 4F 53 43 00 # 'OSC'
  ASS W10 = 41 42 43 00 # 'ABC'

  # you can use variables for start, size and port
  # this example for second 'ABC' message
  ASS I0 = 10 4
  ALIAS I2 PORT
  ASSIGN PORT = $2468
END

# send our OSC messages when we see sustain pedal
IF M0 = B0 40 7F
  # send 'OSC' to host1 on port 1234
  SND 0 4 +Uhost1:$1234

  # send 'ABC' to local IP on port 2468
  # using variables I0-2 for credentials
  SND I0 I1 +U192.168.1.1:PORT
END

Regards, Nic.

Hi marek ,

Like I said, it's a little fiddly. This feature was added for a specific customer so it is not as user friendly as it should be. I have made an online script to make this a little easier though.

Here is how you do it:

The first thing you want to do is trap when we see CC10 on channel 5:

if M0 == B4 $10
  # got CC10 on channel 5, convert to OSC here
end

Second, you want to setup your OSC message into StreamByter's 'W' array. I have made an OSC2SB script here. Using it, will generate the following for your specific OSC message:

# osc2sb - /mix/monitor/0/matrix/fader
ASS W000 = 2F 6D 69 78 2F 6D 6F 6E 69 74 6F 72 2F 30 2F 6D
ASS W010 = 61 74 72 69 78 2F 66 61 64 65 72

The script also gives you a line of code on how to send that message:

SEND $0 $27 +U192.168.1.1:1234

So, putting all of the above together, this code sends the OSC message when one a CC 10 on channel 5 message comes in:

# convert CC10/CH5 to OSC send
if M0 == B4 $10
  # osc2sb - /mix/monitor/0/matrix/fader
  ASS W000 = 2F 6D 69 78 2F 6D 6F 6E 69 74 6F 72 2F 30 2F 6D
  ASS W010 = 61 74 72 69 78 2F 66 61 64 65 72
 
  SEND $0 $27 +U192.168.1.1:1234
end

That's the gist of it. If you want to use the CC's value in the OSC message then that's a bit more complex.

Regards, Nic.

Hi logxen ,

Second question first. I imagine I was thinking that host would be a define (like an alias but different):

if load
  define host 192.168.1.1
end
send $0 $84 +Uhost:port

Now, the first issue/question is more troublesome!

I have not encountered this before (or have had that reported) but it suspiciously sounds like MidiFire is so busy dealing with events from MIDI messages that it gets bogged down to the point of more or less crashing. It's hard to know unless I can reproduce exactly, but it sounds like there could be an event loop - either externally via the interfaces or your script is injecting an event that cause the script to eject an event in an infinite loop, which will pretty well kill the app.

I didn't look at your code closely, and I can see you're injecting albeit with a test that the trigger event is not re-triggering the inject.

My suggestion is to shove an Event Monitor on the canvas before the StreamByter and see if it gets swamped.

On the other hand it is possible there is a bug somewhere in MidiFire, but I would rather eliminate infinite event loops in your setup before I start looking into that.

Regards, Nic.