v4l2_vp9_adapt_coef_probs(9)

💜 v4l2_vp9_adapt_coef_probs — from the Kernel API Manual, bestie ✨

okay so picture this: it's giving kernel-doc, it's giving VP9, and it's literally the glow-up era for coefficient probabilities. this is the v4l2_vp9_adapt_coef_probs(9) page, and we're gonna read it together like it's the group chat. no cap 🫶

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✨ NAME ✨

v4l2_vp9_adapt_coef_probs — does the backward update of the vp9 coefficients probabilities. that's the whole vibe. 👑

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🌸 SYNOPSIS 🌸

void v4l2_vp9_adapt_coef_probs (struct v4l2_vp9_frame_context *probs ,
struct v4l2_vp9_frame_symbol_counts *counts , bool use_128 , bool
frame_is_intra );

four arguments, one function, zero drama (unless you pass something cursed, but that's on you bestie 😭).

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🎀 ARGUMENTS 🎀

• probs — the current probabilities values. like, the probabilities as they are right now, before we mess with them 💅
• counts — the values of symbol counts after the current frame has been decoded. receipts on how many times everything showed up 📊
• use_128 — a flag: if it's true, you're requesting that 128 is used as the update factor; otherwise 112 is used. two numbers, one flag, choose wisely ⭐
• frame_is_intra — flag indicating that FrameIsIntra is true. yes, capital F, capital I, she's iconic like that 🔥

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🦋 DESCRIPTION 🦋

so what does this function actually do? it performs backward updates of coefficients probabilities for the vp9 boolean decoder 🧚

and here's the cute part: after a frame has been decoded, the counts of how many times a given symbol has occurred are known — and those counts get used to update the probability of each symbol. like the frame handed you a little report card and now the probabilities get to level up accordingly 💖

lowkey obsessed with how tidy that is: decode first, count second, adapt after. order matters, bestie, don't skip steps 🙈

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🌈 SEE ALSO 🌈

• kernel file ./include/media/v4l2-vp9.h struct v4l2_vp9_frame_mv_context(9)
• struct v4l2_vp9_frame_context(9)
• struct v4l2_vp9_frame_symbol_counts(9)
• v4l2_vp9_fw_update_probs(9)
• v4l2_vp9_reset_frame_ctx(9)
• v4l2_vp9_adapt_noncoef_probs(9)
• v4l2_vp9_seg_feat_enabled(9)

it's giving "read the whole friend group, not just one text" 💀 go read them, iykyk.

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and that's the page!! mwah 💋 big sign-off energy: this one comes from ./include/media, dated October 2026, living in the Kernel API Manual as v4l2_vp9_adapt_coef_probs(9). bye bestie, go adapt those probabilities 🍓🫶