STRUCT V4L2_VP8_ENTROPY(9)

💅 struct v4l2_vp8_entropy(9) — from the Kernel API Manual, bestie ✨

okay so picture this: you're deep in the kernel API manual, right? and you stumble on struct v4l2_vp8_entropy. that's her. that's the main character. she's all about VP8 update probabilities and honestly? she ate. 🎀

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✨ NAME ✨

struct v4l2_vp8_entropy — the VP8 update probabilities struct, no cap 💖

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🦋 SYNOPSIS 🦋

struct v4l2_vp8_entropy {
    __u8 coeff_probs[4][8][3][V4L2_VP8_COEFF_PROB_CNT];
    __u8 y_mode_probs[4];
    __u8 uv_mode_probs[3];
    __u8 mv_probs[2][V4L2_VP8_MV_PROB_CNT];
    __u8 padding[3];
 };

look at her. the layout. the vibes. immaculate. 🌸

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🫶 Members 🫶

• coeff_probs — the coefficient probability update values, literally the whole point. 🧚
• y_mode_probs — luma intra-prediction probabilities, y'know, the Y ones. ⭐
• uv_mode_probs — chroma intra-prediction probabilities, the UV girlies. 💜
• mv_probs — mv decoding probability. motion vector things. iykyk. 🔥
• padding — padding field. Should be zeroed by applications. yes, actually zero it, don't be that person 🙈

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🌈 Description 🌈

so this structure contains the update probabilities present in the VP8 spec — specifically, go read section '17.2. Probability Updates' of the VP8 specification for more details. that's where the lore lives, bestie 📖✨

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👑 SEE ALSO 👑

Kernel file ./include/uapi/linux/v4l2-controls.h, plus the whole friend group:

• enum v4l2_mpeg_video_av1_profile(9)
• enum v4l2_mpeg_video_av1_level(9)
• enum v4l2_stateless_h264_decode_mode(9)
• enum v4l2_stateless_h264_start_code(9)
• struct v4l2_ctrl_h264_sps(9)
• struct v4l2_ctrl_h264_pps(9)
• struct v4l2_ctrl_h264_scaling_matrix(9)
• struct v4l2_ctrl_h264_pred_weights(9)
• struct v4l2_h264_reference(9)
• struct v4l2_ctrl_h264_slice_params(9)
• struct v4l2_h264_dpb_entry(9)
• struct v4l2_ctrl_h264_decode_params(9)
• struct v4l2_ctrl_fwht_params(9)
• struct v4l2_vp8_segment(9)
• struct v4l2_vp8_loop_filter(9)
• struct v4l2_vp8_quantization(9)
• struct v4l2_vp8_entropy_coder_state(9)
• struct v4l2_ctrl_vp8_frame(9)
• struct v4l2_ctrl_mpeg2_sequence(9)
• struct v4l2_ctrl_mpeg2_picture(9)
• struct v4l2_ctrl_mpeg2_quantisation(9)
• struct v4l2_ctrl_hevc_sps(9)
• struct v4l2_ctrl_hevc_pps(9)
• struct v4l2_hevc_dpb_entry(9)
• struct v4l2_hevc_pred_weight_table(9)
• struct v4l2_ctrl_hevc_slice_params(9)
• struct v4l2_ctrl_hevc_decode_params(9)
• struct v4l2_ctrl_hevc_scaling_matrix(9)
• struct v4l2_vp9_loop_filter(9)
• struct v4l2_vp9_quantization(9)
• struct v4l2_vp9_segmentation(9)
• struct v4l2_ctrl_vp9_frame(9)
• struct v4l2_vp9_mv_probs(9)
• struct v4l2_ctrl_vp9_compressed_hdr(9)
• struct v4l2_ctrl_av1_sequence(9)
• struct v4l2_ctrl_av1_tile_group_entry(9)
• enum v4l2_av1_warp_model(9)
• enum v4l2_av1_reference_frame(9)
• struct v4l2_av1_global_motion(9)
• enum v4l2_av1_frame_restoration_type(9)
• struct v4l2_av1_loop_restoration(9)
• struct v4l2_av1_cdef(9)
• enum v4l2_av1_segment_feature(9)
• struct v4l2_av1_segmentation(9)
• struct v4l2_av1_loop_filter(9)
• struct v4l2_av1_quantization(9)
• struct v4l2_av1_tile_info(9)
• enum v4l2_av1_frame_type(9)
• enum v4l2_av1_interpolation_filter(9)
• enum v4l2_av1_tx_mode(9)
• struct v4l2_ctrl_av1_frame(9)
• struct v4l2_ctrl_av1_film_grain(9)

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and that's the whole thing, bestie. this page lives at ./include/uapi/linux, dated October 2026, and it's still signed struct v4l2_vp8_entropy(9). mwah 💋 go zero your padding fr fr 💀🫶