STRUCT V4L2_SUBDEV_FRAME_SIZE_ENUM(9)

🦋 struct v4l2_subdev_frame_size_enum(9) 🦋

okay bestie, welcome to the Kernel API Manual 💖 this one's about struct v4l2_subdev_frame_size_enum — aka the lil struct that does media bus format enumeration. yes the page header literally calls it struct v4l2_...me_size_enum(9) because it got truncated mid-yawn, but she's the same girl, trust 💅

✨ NAME ✨

struct v4l2_subdev_frame_size_enum — Media bus format enumeration 🌸

✨ SYNOPSIS ✨

like, here she is in all her glory, no cap, every field exactly as it lives:

struct v4l2_subdev_frame_size_enum {
    __u32 index;
    __u32 pad;
    __u32 code;
    __u32 min_width;
    __u32 max_width;
    __u32 min_height;
    __u32 max_height;
    __u32 which;
    __u32 stream;
    __u32 reserved[7];
 };

🎀 Members 🎀

bestie, let's go field by field, we're not skipping a single one:

• index — the format index during enumeration 🔢 like, which one are we on rn
• pad — the pad number, as reported by the media API 🫶
• code — the format code (it's giving MEDIA_BUS_FMT_ definitions energy) ⭐
• min_width — minimum frame width, in pixels ✨
• max_width — maximum frame width, in pixels 💜
• min_height — minimum frame height, in pixels 🦋
• max_height — maximum frame height, in pixels 🌈
• which — the format type (from enum v4l2_subdev_format_whence), periodt 👑
• stream — the stream number, defined in subdev routing 🌊
• reserved — 🚨 drivers and applications must zero this array 🚨 like, not optional, not a vibe, zero it fr fr

no cap on that reserved one — it's an array of 7 __u32, and both drivers and applications have to zero it. don't be the main character who forgets 🙈

👀 SEE ALSO 👀

the whole friend group, all linked, none left out:

• Kernel file ./include/uapi/linux/v4l2-subdev.h enum
• v4l2_subdev_format_whence(9)
• struct v4l2_subdev_format(9)
• struct v4l2_subdev_crop(9)
• struct v4l2_subdev_mbus_code_enum(9)
• struct v4l2_subdev_frame_interval(9)
• struct v4l2_subdev_frame_interval_enum(9)
• struct v4l2_subdev_selection(9)
• struct v4l2_subdev_capability(9)
• struct v4l2_subdev_route(9)
• struct v4l2_subdev_routing(9)
• struct v4l2_subdev_client_capability(9)

okay that's the whole page, you ate that 💅

sign-off time: this cutie lives in ./include/uapi/linux 📁 and she's dated October 2026 🗓️ — manual name Kernel API Manual, page struct v4l2_...me_size_enum(9). mwah, go enumerate some formats bestie 🫶💖