v4l2_isp_stats_init_block(9)

📦 version 7.3.1, in nixpkgs unstable

💅 v4l2_isp_stats_init_block(9) — like, the Kernel API Manual era 🎀

okay so bestie, welcome to the v4l2_isp_stats_init_block page from the Kernel API Manual. yes it's a function, yes it's a nine, yes we're doing this. grab a strawberry drink 🍓 and let's go.

✨ NAME ✨

v4l2_isp_stats_init_block — create and initialize a new block in a statistics buffer. that's the whole vibe. new block, freshly initialized, iconic. 👑

🌸 SYNOPSIS 🌸

struct v4l2_isp_block_header * v4l2_isp_stats_init_block (struct device *dev,
struct v4l2_isp_buffer *buf, const struct v4l2_isp_stats_block_type_info *type_info,
size_t num_block_types, unsigned int block_type, size_t max_size);

(it's giving "long signature, main character energy" and honestly? slay.)

🦋 ARGUMENTS 🦋

  • dev — the driver's device pointer. literally just the device, no cap.
  • buf — the v4l2_isp_buffer where the statistics get serialized. this is the canvas, the moment, the place where it all happens ✨
  • type_info — the array of per-block-type validation info. one entry per block type, all lined up like a little squad 🫶
  • num_block_types — how many block types are actually chillin' in that type_info array. count 'em.
  • block_type — which type of statistics block you want to initialize. the specific one. the chosen one 💅
  • max_size — the maximum size of the data[] member of buf. the ceiling, the limit, the "don't get too comfy" number 🎀

💖 DESCRIPTION 💖

so what does it actually do? it locates, and then initializes, a new statistics block inside buf so the driver can go populate its content. 🧚

it does the vibe check first, bestie: the function checks that there's enough space in buf for the requested block_type. if yes? it increments the 'data_size' member of buf. and the newly created statistics block's header gets initialized with the size and type info that the caller handed over in type_info. chef's kiss. 🔥

real talk: drivers should call this function before populating a new statistics block's content. like, before. not after. we don't do that here. 🙈

and what comes back? a pointer to the next available location in buf — or an error pointer if the requested block_size is not available in buf, or if block_type is not valid. 😭 so check your pointer, periodt.

🌈 SEE ALSO 🌈

all the related lore, go read it, it's giving study group 📚✨

and that's the page!! mwah 💜 this lil doc lives in ./include/media, dated October 2026, and it's filed under v4l2_isp_stats_init_block(9) — so if you forget where you found it, that's where. go init some blocks responsibly, bestie 🎀💖🌟

📦 where this page comes from