STRUCT V4L2_AV1_QUANTIZATION(9)

okay so this is the struct v4l2_av1_quantization(9) page from the Kernel API Manual, and it’s literally the AV1 Quantization params struct. ✨ She’s giving quantizer main character energy, and you’re gonna slay this one, bestie. 💅

🌸 NAME 🌸

struct v4l2_av1_quantization — AV1 Quantization params as defined in section 6.8.11 "Quantization params semantics" of the AV1 specification. 🎀

✨ SYNOPSIS ✨

Here’s the whole struct, bestie — every field, no skips:

struct v4l2_av1_quantization {
    __u8 flags;
    __u8 base_q_idx;
    __s8 delta_q_y_dc;
    __s8 delta_q_u_dc;
    __s8 delta_q_u_ac;
    __s8 delta_q_v_dc;
    __s8 delta_q_v_ac;
    __u8 qm_y;
    __u8 qm_u;
    __u8 qm_v;
    __u8 delta_q_res;
};

💅 Members 💅

• flags — see V4L2_AV1_QUANTIZATION_FLAG_{}. 👀
• base_q_idx — indicates the base frame qindex. This is used for Y AC coefficients and as the base value for the other quantizers. 💖
• delta_q_y_dc — indicates the Y DC quantizer relative to base_q_idx.
• delta_q_u_dc — indicates the U DC quantizer relative to base_q_idx.
• delta_q_u_ac — indicates the U AC quantizer relative to base_q_idx.
• delta_q_v_dc — indicates the V DC quantizer relative to base_q_idx.
• delta_q_v_ac — indicates the V AC quantizer relative to base_q_idx.
• qm_y — specifies the level in the quantizer matrix that should be used for luma plane decoding. 🌟
• qm_u — specifies the level in the quantizer matrix that should be used for chroma U plane decoding.
• qm_v — specifies the level in the quantizer matrix that should be used for chroma V plane decoding.
• delta_q_res — specifies the left shift which should be applied to decoded quantizer index delta values. 🌈

🔮 SEE ALSO 🔮

Kernel file ./include/uapi/linux/v4l2-controls.h is right here, and the whole reference crew is below — every single one, no cap. 🫶

• 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(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_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)

That’s the page, bestie! 🫶 Source/version vibes come from ./include/uapi/linux, and the date is October 2026 — iconic, periodt. 💖