STRUCT V4L2_SELECTION(9)

💅 struct v4l2_selection(9) — Kernel API Manual 🎀

okay bestie, sit down, hydrate, and let me tell you about struct v4l2_selection</p> — it's literally the selection info struct from the Linux kernel API and she is iconic. this is the glow-up version of the manual page, same facts, way better vibes. periodt. ✨

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🌸 NAME 🌸

struct v4l2_selection</p> — selection info. that's it, that's the name, she's concise and she knows it 💅

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🦋 SYNOPSIS 🦋

struct v4l2_selection {
    __u32 type;
    __u32 target;
    __u32 flags;
    struct v4l2_rect        r;
    __u32 reserved[9];
 };

look at her. five members. flawless structure. no notes. 💖

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✨ Members ✨

• type — the buffer type. and listen, do not use *_MPLANE types here, that's the rule, i don't make the rules (i do know them though) 🙈
• target — the selection target! this is what picks which rectangle you're talking about out of all the possible ones. it's defined in v4l2-common.h and the values are V4L2_SEL_TGT_*. she's the main character of choosing 🎯
• flags — the constraints flags, also defined in v4l2-common.h, and the values are V4L2_SEL_FLAG_*. little toggles, big energy ⭐
• r — the coordinates of the selection window. this is the actual rectangle, the whole point, the moment 🫶
• reserved — reserved for future use, rounds the structure size up to 64 bytes, and you set it to zero. it's a placeholder bestie, be nice to it, zero it out 💀

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🌈 Description 🌈

so here's the tea ☕ — hardware may use multiple helper windows to process a video stream. like, more than one. a whole little squad of windows doing the work.

and this structure? she's the go-between 💌 — the thing used to exchange these selection areas between an application and a driver. app says something, driver says something back, everybody's on the same page. communication slay.

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🔥 SEE ALSO 🔥

kernel file ./include/uapi/linux/videodev2.h, plus the whole friend group, all invited to the group chat:

• struct v4l2_capability(9)
• struct v4l2_plane(9)
• struct v4l2_buffer(9)
• v4l2_timeval_to_ns(9)
• struct v4l2_exportbuffer(9)
• struct v4l2_plane_pix_format(9)
• struct v4l2_pix_format_mplane(9)
• struct v4l2_sdr_format(9)
• struct v4l2_meta_format(9)
• struct v4l2_format(9)
• struct v4l2_event_motion_det(9)
• struct v4l2_create_buffers(9)
• struct v4l2_remove_buffers(9)

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ngl bestie, if you take one thing from this page: type gets a real buffer type (not the *_MPLANE ones) and reserved stays zero. everything else is just rectangles living their truth. 🧚

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and that's the whole page!! 💖✨🎀🦋🌸💅🫶 sourced straight from ./include/uapi/linux, dated October 2026, and brought to you by the struct v4l2_selection(9) crew. mwah. 😭👑