STRUCT VDEC_AV1_SLICE_QUANTIZATION(9)

Kernel API Manual · struct vdec_av1_slice_quantization(9) — welcome to the AV1 quantization params page, bestie 💖 no cap, this is the whole vibe.

✨ NAME ✨

struct vdec_av1_slice_quantization — AV1 Quantization params 🎀

🌈 SYNOPSIS 🌈

struct vdec_av1_slice_quantization {
    int base_q_idx;
    int qindex[V4L2_AV1_MAX_SEGMENTS];
    int delta_qydc;
    int delta_qudc;
    int delta_quac;
    int delta_qvdc;
    int delta_qvac;
    u8 using_qmatrix;
    u8 qm_y;
    u8 qm_u;
    u8 qm_v;
};

🧚 Members 🧚

okay so here's the member-by-member tea, and yes every field is staying:

• base_q_idx — indicates the base frame qindex. This is used for Y AC coefficients and as the base value for the other quantizers. main character energy fr fr 👑
• qindex — it's qindex. That's the whole description: qindex. lowkey iconic for giving us nothing else 😭
• delta_qydc — indicates the Y DC quantizer relative to base_q_idx. slay 💅
• delta_qudc — indicates the U DC quantizer relative to base_q_idx. periodt.
• delta_quac — indicates the U AC quantizer relative to base_q_idx. yes bestie 🌸
• delta_qvdc — indicates the V DC quantizer relative to base_q_idx. iconic.
• delta_qvac — indicates the V AC quantizer relative to base_q_idx. we love a consistent queen 💜
• using_qmatrix — specifies that the quantizer matrix will be used to compute quantizers. noted, bestie ✨
• qm_y — specifies the level in the quantizer matrix that should be used for luma plane decoding. luma gets its moment 🎀
• qm_u — specifies the level in the quantizer matrix that should be used for chroma U plane decoding. chroma U said hi 🦋
• qm_v — specifies the level in the quantizer matrix that should be used for chroma V plane decoding. and chroma V completes the trio 💫

💜 SEE ALSO 💜

• Kernel file: ./drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_av1_req_lat_if.c
• struct vdec_av1_slice_init_vsi(9)
• struct vdec_av1_slice_mem(9)
• struct vdec_av1_slice_state(9)
• struct vdec_av1_slice_tile_group(9)
• struct vdec_av1_slice_scale_factors(9)
• struct vdec_av1_slice_frame_refs(9)
• struct vdec_av1_slice_gm(9)
• struct vdec_av1_slice_sm(9)
• struct vdec_av1_slice_seg(9)
• struct vdec_av1_slice_delta_q_lf(9)
• struct vdec_av1_slice_lr(9)
• struct vdec_av1_slice_loop_filter(9)
• struct vdec_av1_slice_cdef(9)
• struct vdec_av1_slice_mfmv(9)
• struct vdec_av1_slice_tile(9)
• struct vdec_av1_slice_uncompressed_header(9)
• struct vdec_av1_slice_seq_header(9)
• struct vdec_av1_slice_frame(9)
• struct vdec_av1_slice_work_buffer(9)
• struct vdec_av1_slice_frame_info(9)
• struct vdec_av1_slice_slot(9)
• struct vdec_av1_slice_fb(9)
• struct vdec_av1_slice_vsi(9)
• struct vdec_av1_slice_pfc(9)
• struct vdec_av1_slice_instance(9)

that's the whole page, bestie 🫶 the footer says source/version ./drivers/media/platform/media..., date October 2026, and page struct vdec_...quantization(9). mwah 💖