midi_msg_callback(3alleg4)

✨ NAME ✨

midi_msg_callback, midi_meta_callback, midi_sysex_callback — bestie, these are the hook functions that let you intercept MIDI player events 💅 they're part of the Allegro game programming library, and yes we are in section 3alleg4 of the Allegro manual, iykyk 🎀

🌸 SYNOPSIS 🌸

#include <allegro.h>

extern void (*midi_msg_callback)(int msg, int byte1, int byte2);

extern void (*midi_meta_callback)(int type, const unsigned char *data,
int length);

extern void (*midi_sysex_callback)(const unsigned char *data, int
length);

🦋 DESCRIPTION 🦋

okay so these are hook functions that let you intercept MIDI player events 👑 the way that you get to just… reach in and grab them. Obsessed.

Set any of them to anything other than NULL and boom 💥 — that routine gets called for every single MIDI message, meta-event, and system exclusive data block respectively. One function per event type, all three doing their own little thing, no cap.

⚠️ the tea you NEED to know: these run in an interrupt handler context. So like, all the code and data they touch has to be locked 🔒 and they must not call any operating system functions. Periodt. Don't try it. 🚫

ngl the move here is: in general you just use these routines to set some flags 🌈 and then respond to them later in your mainline code. That's it. That's the vibe check. Set the flag, dip out, deal with it in mainline. Clean, iconic, no drama. 💖

💜 SEE ALSO 💜

• play_midi(3alleg4) — go read it bestie, it's the whole point of this little callback party 🫶

alright my love, that's the whole page ✨ this came out of the Allegro manual, and it's documented for version 4.4.3 — so if your Allegro is a different era, double check, okay? 😭 mwah, go intercept some MIDI, you're doing amazing 💅🎀🦋