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MIDIThruConnection Usage
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MIDIThruConnection Usage


  • Subject: MIDIThruConnection Usage
  • From: Peter Zegelin <email@hidden>
  • Date: Wed, 12 Nov 2008 22:42:16 +1100

Hi,

I am trying to figure out how to create a MIDI thru connection in my application without much luck. I found some example code from this list:

http://lists.apple.com/archives/coreaudio-api/2003/Sep/msg00211.html but like the original poster, I cannot get it to work.

This is what I have done.

I have created a MIDI source in my app ('Rondo') and the destination is a UM-1 USB to MIDI convertor. My app specifies the UM-1 as its destination. The application is running.

I created a simple tool with the example code and run it in the debugger. The arguments: -d UM-1,-s Rondo and -r 20:20 are passed in to main(). Stepping through, the source, destination and MIDIThruConnectionRef all appear to be OK. When I play a MIDI file in my app I would have expected almost all notes to be suppressed due to the -r 20:20 command ( which sets params.lowNote and params.highNote to 20) but everything plays as if there is no thru connection at all.

I guess I am doing something fundamentally wrong but can't even begin to see where. I would be grateful for some advice or an example of how to get this working. Basically I want to be able to intercept the stream of events from a playing MIDI file and do some filtering.

thanks!

Peter
www.fracturedsoftware.com
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