STRUCT V4L2_CTRL_FWHT_PARAMS(9)

🦋 struct v4l2_ctrl_fwht_params(9) 🦋

okay bestie, welcome to the Kernel API Manual — this is the page for struct v4l2_ctrl_fwht_params, with that struct v4l2_..._fwht_params(9) header/footer shorthand living rent-free in the margins 💅

✨ NAME ✨

struct v4l2_ctrl_fwht_params — FWHT parameters. that's the name, that's the vibe, and we're obsessed 🫶

🌸 SYNOPSIS 🌸

here's the exact shape of it, no cap:

struct v4l2_ctrl_fwht_params {
    __u64 backward_ref_ts;
    __u32 version;
    __u32 width;
    __u32 height;
    __u32 flags;
    __u32 colorspace;
    __u32 xfer_func;
    __u32 ycbcr_enc;
    __u32 quantization;
};

🎀 Members 🎀

member by member, bestie — no skipping:

• backward_ref_ts — timestamp of the V4L2 capture buffer to use as reference. The timestamp refers to the timestamp field in struct v4l2_buffer. Use v4l2_timeval_to_ns to convert the struct timeval to a __u64. literally the reference-buffer timestamp situation ✨
• version — must be V4L2_FWHT_VERSION. no substitutions, periodt.
• width — width of frame.
• height — height of frame.
• flags — FWHT flags (see V4L2_FWHT_FL_*). flag lore goes here 🔥
• colorspace — the colorspace (enum v4l2_colorspace).
• xfer_func — the transfer function (enum v4l2_xfer_func).
• ycbcr_enc — the Y'CbCr encoding (enum v4l2_ycbcr_encoding).
• quantization — the quantization (enum v4l2_quantization).

💖 SEE ALSO 💖

Kernel file: ./include/uapi/linux/v4l2-controls.h

and now the whole extended cinematic universe, every single one:

• 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_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_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)

xoxo, your Kernel API Manual bestie 🫶 — source: ./include/uapi/linux, date: October 2026, and the footer title is still struct v4l2_..._fwht_params(9) for the vibes 💅✨