STRUCT V4L2_CREATE_BUFFERS32(9)

💅 struct v4l2_create_buffers32(9) — Kernel API Manual, bestie edition

okay so welcome to the group chat, this is the manual page for struct v4l2_create_buffers32 and honestly it's giving "compat ioctl icon" energy the whole way through. pull up a chair 🎀

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✨ NAME ✨

struct v4l2_create_buffers32 — literally just the argument struct for VIDIOC_CREATE_BUFS32, no cap 💅

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🌸 SYNOPSIS 🌸

struct v4l2_create_buffers32 {
    __u32 index;
    __u32 count;
    __u32 memory;
    struct v4l2_format32    format;
    __u32 capabilities;
    __u32 flags;
    __u32 max_num_buffers;
    __u32 reserved[5];
 };

look at her. iconic. every field exactly where it should be 🫶

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🦋 Members 🦋

• index — on return, this is the index of the first created buffer. so like, where the party starts ✨
• count — entry: number of requested buffers. you say how many you want, she does her thing.
• memory — the buffer memory type. iykyk.
• format — the frame format, for which buffers are requested. the whole point, honestly 💖
• capabilities — capabilities of this buffer type. very demure, very mindful.
• flags — additional buffer management attributes. BUT 🚨 these are ignored unless the queue has the V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability and is configured for MMAP streaming I/O. read that twice, bestie.
• max_num_buffers — if the V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS capability flag is set, this field indicate the maximum possible number of buffers for this queue. (yes, "indicate." she said what she said 🌈)
• reserved — future extensions 👀 the reserved [5] girlies are just waiting their turn

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⭐ Return ⭐

number of created buffers. that's it, that's the return value, and we love a straightforward queen 👑

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💜 SEE ALSO 💜

• Kernel file ./drivers/media/v4l2-core/v4l2-compat-ioctl32.c — go read the source, it slaps
• v4l2_compat_ioctl32(9)

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real talk though: those flags are conditional and those reserved fields are not yours to touch. respect the ABI, protect your vibe check 🙈

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and that's the page!! from ./drivers/media/v4l2-core, dated October 2026, titled struct v4l2_...te_buffers32(9) — mwah, go create some buffers bestie, ily, bye 🧚💜