ENUM V4L2_AV1_REFERENCE_FRAME(9)

💅 enum v4l2_av1_reference_frame(9)

okay so bestie, welcome to the Kernel API Manual ✨ this one's a little enum from the Linux kernel docs, and honestly? it's giving "tiny but mighty." it's literally called enum v4l2_av1_reference_frame and it's all about AV1 reference frames 🎀

---

🌸 NAME 🌸

enum v4l2_av1_reference_frame — AV1 reference frames. that's it, that's the whole vibe 🦋

---

✨ SYNOPSIS ✨

here's the whole thing, character for character, no cap:

enum v4l2_av1_reference_frame {
    V4L2_AV1_REF_INTRA_FRAME ,
    V4L2_AV1_REF_LAST_FRAME ,
    V4L2_AV1_REF_LAST2_FRAME ,
    V4L2_AV1_REF_LAST3_FRAME ,
    V4L2_AV1_REF_GOLDEN_FRAME ,
    V4L2_AV1_REF_BWDREF_FRAME ,
    V4L2_AV1_REF_ALTREF2_FRAME ,
    V4L2_AV1_REF_ALTREF_FRAME

};

---

🎀 Constants 🎀

eight constants, all iconic, all accounted for 👑

• V4L2_AV1_REF_INTRA_FRAME — Intra Frame Reference 💖 the one that stays in its own lane, no outside references needed
• V4L2_AV1_REF_LAST_FRAME — Last Reference Frame ⭐
• V4L2_AV1_REF_LAST2_FRAME — Last2 Reference Frame 🌸
• V4L2_AV1_REF_LAST3_FRAME — Last3 Reference Frame 🦋
• V4L2_AV1_REF_GOLDEN_FRAME — Golden Reference Frame 👑 main character energy fr fr
• V4L2_AV1_REF_BWDREF_FRAME — BWD Reference Frame 🔥
• V4L2_AV1_REF_ALTREF2_FRAME — Alternative2 Reference Frame 💜
• V4L2_AV1_REF_ALTREF_FRAME — Alternative Reference Frame 🌈

ngl bestie, the descriptions are short here — that's just how the original rolls, so i'm not out here inventing lore that isn't there 🙈

---

🔗 SEE ALSO 🔗

so this enum lowkey has a whole extended friend group 💀 — the source lives in the kernel file ./include/uapi/linux/v4l2-controls.h (enum), and then there's this entire list of siblings and cousins:

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), 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)

like i said. huge friend group. iykyk 😭🫶

---

and that's the whole page bestie!! 🧚 from ./include/uapi/linux, this October 2026 drop of the Kernel API Manual — go forth and reference those frames, periodt 💅🍓