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How do I calculate time divisions for MIDI files? (kbin.social)

submitted 1 year ago by ZILtoid1991@kbin.social to c/programming@kbin.social

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https://github.com/ZILtoid1991/pixelperfectengine/blob/117ffcf785b5fadf4324902d4944238d34668e65/pixelperfectengine/src/pixelperfectengine/audio/base/midiseq.d#L125

I have some issues with understanding the documentation on how set tempo events and time divisions work, so it's really not well calculated, and thus causes my code to just zoom through the MIDI file I'm throwing at it. Maybe there's some other chunks I'm not processing at the function that should be processing MIDI events here, so I don't really know.

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[–] VeeSilverball@kbin.social 2 points 1 year ago

An overview of PPQN:

http://midi.teragonaudio.com/tech/midifile/ppqn.htm

Some reference code I've used, which might help with architectural issues: https://github.com/triplefox/minimidi/tree/master/minimidi

[–] ZILtoid1991@kbin.social 1 points 1 year ago

Potential solution: It seems like multiplying the time by 10 solved it, at least now it doesn't zooms through the MIDI track in an instant.

https://github.com/ZILtoid1991/pixelperfectengine/blob/5cc5834f931783b5553d9959cfe66fe8f9ea6cfe/pixelperfectengine/src/pixelperfectengine/audio/base/midiseq.d#L125