STRUCT V4L2_JPEG_FRAME_HEADER(9)

💖 NAME 💖

struct v4l2_jpeg_frame_header — bestie, it's literally the JPEG frame header 🎀

So this is the Kernel API Manual entry for it, and we're gonna go through the whole thing together, no skipping, okay? 🫶

---

✨ SYNOPSIS ✨

Okay so here's the struct in all its glory, and yes you're gonna read every line of it:

struct v4l2_jpeg_frame_header {
    u16 height;
    u16 width;
    u8 precision;
    u8 num_components;
    struct v4l2_jpeg_frame_component_spec
component[V4L2_JPEG_MAX_COMPONENTS];
    enum v4l2_jpeg_chroma_subsampling subsampling;
 };

Look at her. Main character energy fr 💅

---

🌸 Members 🌸

These are the fields, one by one, and I'm gonna tell you exactly what each one is, no gatekeeping:

• height — Y. That's it. That's the whole thing. It's Y 😭
• width — X. Same vibe, it's X 🌈
• precision — P. Yes, just P. She's mysterious, she's iconic 💜
• num_components — Nf ✨
• component — the component-specification, like, the actual spec for a component — go see v4l2_jpeg_frame_component_spec for that whole situation 🦋
• subsampling — the decoded subsampling, pulled straight out of the component-specification 👑

ngl the single-letter descriptions are giving cryptic, but that's genuinely all the manual says, so I'm not gonna invent lore for you 🙈

---

🎀 SEE ALSO 🎀

The kernel file lives at ./include/media/v4l2-jpeg.h, and here's the whole friend group you should also go say hi to:

• struct v4l2_jpeg_reference(9)
• struct v4l2_jpeg_frame_component_spec(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)

All of them, linked, exactly as listed. Go read them, bestie, they're literally right there 📚💖

---

⭐ sign-off ⭐

This little masterpiece lives in the source directory ./include/media, and the version/date on the tin is October 2026. Slay. Periodt. 💅🌸🎀

Stay hydrated and may your headers always parse 🧚💜