snd_ump_convert_from_ump(9)

✨ snd_ump_convert_from_ump(9) ✨

okay bestie, welcome to the Kernel API Manual 💖 this one lives in ./sound/core and it's literally the glow-down machine: it takes a shiny modern UMP packet and turns it back into old-school MIDI 1.0 bytes. no cap, the vibes are immaculate.

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🎀 NAME 🎀

snd_ump_convert_from_ump — convert from UMP to legacy MIDI 🦋

like... it does exactly what it says on the tin, bestie. from UMP. legacy MIDI. slay.

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🌸 SYNOPSIS 🌸

int snd_ump_convert_from_ump (const u32 *data , unsigned char *buf ,
       unsigned char *group_ret );

three args, one int coming back at you. it's giving "small function, big responsibilities" 💅

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⭐ ARGUMENTS ⭐

• data — the UMP packet itself, a const u32 *. this is the main character of the whole operation 🔥
• buf — buffer where the legacy MIDI data gets stored. it's unsigned char *, it's the destination, it's ready for its moment 👑
• group_ret — pointer to store the target group in. yes bestie, we're reporting back where it came from 🫶

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💜 DESCRIPTION 💜

so here's the tea ☕ — this function converts from a UMP packet data into MIDI 1.0 bytes, and it drops those bytes right at buf. iconic behaviour, honestly.

the target group? it gets stored at group_ret. so you're never left wondering which group your little MIDI bytes belonged to 💀

and the return value? it's the number of bytes of MIDI 1.0 stream. that's it. that's the number. count it, love it, use it ✨

ngl, keep an eye on your buf — it needs to be big enough for the MIDI 1.0 bytes, and the only way you know how many there are is the return value. just saying 🙈

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🦋 SEE ALSO 🦋

• Kernel file ./sound/core/ump_convert.c
• snd_ump_convert_to_ump(9) — the reverse direction, the origin story, the prequel 🌈

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okay that's the whole page, and before you go: this little baddie is filed under ./sound/core, dated October 2026, and it's snd_ump_convert_from_ump(9) all over again — we've come full circle 🧚💖 bye bestie, go convert something 🎀