al_register_sample_identifier(3alleg5)

💖 al_register_sample_identifier — bestie, we're teaching Allegro how to sniff out file types 💖

okay so real talk, this one lives in the Allegro 5 API (that's the 3alleg5 manual, section 3, if you're keeping score) and it's giving "let me introduce you to my little friend, the identify handler" energy. Let's get into it. 🎀

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✨ SYNOPSIS ✨

#include <allegro5/allegro_audio.h>

bool al_register_sample_identifier(const char *ext,
   bool (*identifier)(ALLEGRO_FILE* fp))

look at her. two args, one bool back. iconic. 👑

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🌸 DESCRIPTION 🌸

So what you're doing here is registering an identify handler for al_identify_sample(3alleg5). Like, you're handing Allegro a little detective function and saying "hey, when you see files with this extension, run this to figure out what they actually are." 🕵️♀️✨

That function you pass in gets called with a single argument of type ALLEGRO_FILE(3alleg5) — and important detail, bestie: that's a file handle already opened for reading, and it's sitting at the first byte of the file. So you're right at the start, no scrolling needed. 🫶

Your handler's whole job? Read as few bytes as possible while still safely determining whether the file's contents match the type that goes with that extension. If yes → return true. If no → return false. That's it, that's the assignment. 💅

⚠️ two rules, do not break them: - Do NOT close the file handle. Nope. Not yours to close. - You don't need to reset it back to the beginning either. Chill. 😌

Now about the extension — it should include the leading dot (that's the . character, yes the little guy). And it gets matched case-insensitively, so don't stress about MP3 vs mp3, she's flexible. 🦋

And here's a fun one: the identifier argument can be NULL — and that's how you unregister an entry. Cleanup era. 🧹

Return values, because we love clarity:

• Returns true on success 🎉
• Returns false on error 😭
• Also returns false if you try to unregister an entry that doesn't exist. Yeah. Nothing to delete, nothing to celebrate.

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⭐ SINCE ⭐

5.2.8 — she's been around since 5.2.8, a lil vintage queen. 👑

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🌈 SEE ALSO 🌈

• al_identify_bitmap(3alleg5)

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and that's the whole page, bestie!! no cap, you now know exactly how to slide a sample identifier into Allegro's registry. go forth and identify samples responsibly 💖✨

~ fin ~ — this was pulled straight from the Allegro reference manual, page al_register_sample_identifier(3alleg5), and it's officially SINCE 5.2.8 so you know the vibe is time-tested. mwah. 🎀🫶💅