STRUCT V4L2_JPEG_REFERENCE(9)

💅 struct v4l2_jpeg_reference(9) 💅

okay bestie, welcome to the Kernel API Manual — this one's a little struct from the v4l2-jpeg header and honestly? she's small but she matters. iykyk 🌸

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✨ NAME ✨

struct v4l2_jpeg_reference — literally just a reference into the JPEG buffer 🎀

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🦋 SYNOPSIS 🦋

struct v4l2_jpeg_reference {
    u8 *start;
    size_t length;
};

like, that's the whole thing. two fields. she's compact. she's iconic. 💅

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👯 MEMBERS 👯

• start — pointer to the start of the referenced segment or table ✨
• length — size of the referenced segment or table. yes, the size. of the thing. 🫶

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💖 DESCRIPTION 💖

okay so when you're referencing marker segments, here's the vibe check you cannot fail: start points right after the marker code, and length is the size of the segment parameters — excluding the marker code. fr fr, don't count the marker code, that's the whole trick 😭

ngl this is the kind of off-by-a-few-bytes situation that will absolutely ruin your day, so like… read it twice. 💀

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🌈 SEE ALSO 🌈

• Kernel file ./include/media/v4l2-jpeg.h
• struct v4l2_jpeg_frame_component_spec(9)
• struct v4l2_jpeg_frame_header(9)
• struct v4l2_jpeg_scan_component_spec(9)
• struct v4l2_jpeg_scan_header(9)
• enum v4l2_jpeg_app14_tf(9)
• struct v4l2_jpeg_header(9)

like, go read the whole friend group, they all slay together 🧚‍♀️

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okay that's the page!! mwah 💋 this one came straight out of ./include/media, dated October 2026, and she goes by struct v4l2_jpeg_reference(9) — stan a tiny struct with big main character energy 👑⭐