MIDIMonitor: crash when using device IAC and many notes sent at once

[bwagner]

MIDIMonitor: crash when using device IAC and many notes sent at once

[krevis]

Will do a release of MIDI Monitor 1.5.4 shortly!

[krevis]

Thanks for the repro case, that's very helpful. Investigating.

The crash is in code that gets MIDI data from the "spying" MIDI driver. If you turn off "Spy on output to destinations > IAC Driver Bus 1", then it's fine.

[krevis]

My fault. SpyingMIDIDriver::SizeOfPacketList is very old and does not account for the 4-byte alignment of MIDIPackets on Apple Silicon processors.

[bwagner]

Interesting: After installing 1.5.4 I still get a crash in that situation.
midi_monitor_crash2.txt

[krevis]

The bug fix was actually in the driver that gets installed into ~/Library/Audio/MIDI Drivers/MIDI Monitor.plugin.

So a few things might have gone wrong:

1. When the new version of the app ran for the first time, it should have updated that driver. Check whether it's version 1.5.4.
2. If you moved that driver away from its installed location, perhaps into /Library/Audio/MIDI Drivers, then that old copy might be getting used instead. Check for any copies and remove them. The one in ~/Library/Audio/MIDI Drivers ought to work.
3. If some other app or process has been using CoreMIDI, it will be keeping the MIDIServer process alive, with the old driver code. Try quitting all apps that use MIDI, wait a few moments, then launch MIDI Monitor again and try again. Or, to be completely foolproof, log out and in again, or just restart the whole computer.

Let me know if that none of those help.

[bwagner]

restarted my computer and now it works. Thank you!