How to send a midi out clock?

[moebiussurfing]

Hey @danomatika ,
I checked your MIDI input clock receiver example and it works fine.

Do you have some implementation/example of sending a MIDI clock to a MIDI Out port?
I would like to integrate here https://github.com/moebiussurfing/ofxBeatClock.

Any help is appreciated.

Regards

[danomatika]

I don't. The MIDI spec is pretty stringent on timing, so an OS-agnostic fast & accurate timer is required. When I first added this part, there wasn't anything available in C++ without having to do a bunch of platform-specific stuff but now there should be. The protocol is pretty simple, so it would be adding a function to take the time and output an array of bytes for the timer to send out. The best solution is probably to have the timer run in it's own thread if it is not callback-based.

[moebiussurfing]

Hey @danomatika
I think that I made it work!

I just tested to receive play/stop and beat ticks and tempo to Ableton Live (Windows 11 & macOS / OF 0.12.0) and it worked!
(I am unsure if the time position is included in the MIDI protocol...)

I did the code assisted with Anthropic Claude, so I am not sure if that is optimal or redundant.
It seems to be platform-agnostic too.

I posted a repo to check by yourself if you like.
Of course, feel free to include it as an example here in ofxMidi.

https://github.com/moebiussurfing/TEST_MidiOutClock

[moebiussurfing]

oops! bad news.
now I see that there's some difference between bpm master/slave tempos...

[moebiussurfing]

well. now is better but requires some seconds (~10) to finish syncing the correct bpm.