STRUCT VDEC_LAT_BUF(9)

✨ struct vdec_lat_buf(9) ✨

okay so bestie, buckle up — this is a page straight out of the Kernel API Manual, section 9, and it's all about struct vdec_lat_buf, aka the lat buffer message used to store lat info for core decode. yes i know, "lat" twice, we love a consistent queen 💅

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🌸 NAME 🌸

struct vdec_lat_buf — the lat buffer message that stores lat info for core decode 🎀

Like, it's literally a little envelope that carries all the lat-related gossip over to core decode. main character energy, honestly.

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🦋 SYNOPSIS 🦋

here's the whole struct, laid out exactly as-is, no cap:

struct vdec_lat_buf {
    struct mtk_vcodec_mem wdma_err_addr;
    struct mtk_vcodec_mem slice_bc_addr;
    struct mtk_vcodec_mem rd_mv_addr;
    struct mtk_vcodec_mem tile_addr;
    struct vb2_v4l2_buffer ts_info;
    struct media_request *src_buf_req;
    void *private_data;
    struct mtk_vcodec_dec_ctx *ctx;
    core_decode_cb_t core_decode;
    struct list_head lat_list;
    struct list_head core_list;
    bool is_last_frame;
 };

she's got range ✨ hardware addresses, a timestamp carrier, a media request, callback pointers, two whole list heads… iconic.

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💖 Members 💖

• wdma_err_addr — the wdma error address used for lat hardware 🫶
• slice_bc_addr — the slice bc address used for lat hardware, okurrr
• rd_mv_addr — the mv addr for av1 lat hardware output AND core hardware input — she's working both sides of the pipeline, we stan a multitasker 💀
• tile_addr — the tile buffer for av1 core input 🧚
• ts_info — you need to set the timestamp from output to capture here, don't forget bestie 🙈
• src_buf_req — the output buffer media request object 🌈
• private_data — shared information used by BOTH lat and core hardware — a true friend to all 💜
• ctx — mtk vcodec context information 🔥
• core_decode — different codecs use different decode callback functions, so like, every codec picks its own fave ✨
• lat_list — adds the lat buffer to the lat head list 🎀
• core_list — adds the lat buffer to the core head list 🦋
• is_last_frame — meaning this buffer is the last frame 😭 the finale, the send-off, periodt

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👑 SEE ALSO 👑

the kernel file to go peep is:

./drivers/media/platform/mediatek/vcodec/decoder/vdec_msg_queue.h enum

and these lovely neighbors, all in their own (9) sections:

• core_ctx_status(9)
• struct vdec_msg_queue_ctx(9)
• struct vdec_msg_queue(9)
• vdec_msg_queue_init(9)
• vdec_msg_queue_init_ctx(9)
• vdec_msg_queue_qbuf(9)
• vdec_msg_queue_dqbuf(9)
• vdec_msg_queue_update_ube_rptr(9)
• vdec_msg_queue_update_ube_wptr(9)
• vdec_msg_queue_wait_lat_buf_full(9)
• vdec_msg_queue_deinit(9)

iykyk — the whole vdec_msg_queue friend group is right there 🫶

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⭐ real talk: everything above comes from the original page, so don't come for me if your kernel tree disagrees — go read that header file, bestie 💖

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and that's a wrap! 🎀 source path on the original footer was ./drivers/media/platform/media... and it's dated October 2026 — so like, future vibes only 🌸✨ slay, bye! 💅