v4l2_m2m_prepare_buf(9)

📦 version 7.3.1, in nixpkgs unstable

💅 v4l2_m2m_prepare_buf(9) — the Kernel API Manual page, bestie edition 🎀

okay so ✨ this is a page straight out of the Kernel API Manual (yes the actual kernel docs, we're fancy now 💅) and it's all about one lil function that gets a buffer ready to go — src or dst, depends on the type, iykyk 🦋

✨ NAME ✨

v4l2_m2m_prepare_buf — prepare a source or destination buffer, depending on the type 💖

like, that's literally the whole gig. you hand it a buffer and it preps it. whether it's the source one or the destination one is just… vibes-based on the type, no cap 🌸

🫶 SYNOPSIS 🫶

int v4l2_m2m_prepare_buf (struct file *file , struct v4l2_m2m_ctx
*m2m_ctx , struct v4l2_buffer *buf );

it returns an int, bestie. and it takes three pointers. three!! we love a three-pointer situation 😭

🧚 ARGUMENTS 🧚

  • file — pointer to struct file. that's it, that's the whole description. a pointer. to a struct file. iconic behavior honestly 👑
  • m2m_ctx — the m2m context that's been assigned to the instance, given by struct v4l2_m2m_ctx. so like, the mem2mem context holding it down for this instance 🫶
  • buf — pointer to struct v4l2_buffer. your buffer!! the one getting prepped!! go off 🎀

👀 SEE ALSO 👀

so this function has a whole friend group, and honestly the way it's an entire extended family of (9) pages… 🔥

the kernel file for all this is at ./include/media/v4l2-mem2mem.h, and it's giving main character energy for:

bestie that's like sixty cross-references. read them. all of them. i'm not kidding 🙈

✨ and that's the page!! 🌈 it lives in ./include/media, dated October 2026, and the manual page itself is v4l2_m2m_prepare_buf(9) 🎀

go prep some buffers, you absolute icon 👑💜 periodt.

📦 where this page comes from