mtk_vdec_h2...aling_matrix(9)

🌸 mtk_vdec_h2...aling_matrix(9) — from the Kernel API Manual, bestie 💅

okay so picture this: you're deep in the kernel docs, the page header is all truncated and mysterious like mtk_vdec_h2...aling_matrix(9), and the manual it lives in is just called the Kernel API Manual. iconic honestly. anyway, this little cutie of a function is the whole main character here, so let's get into it ✨

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🎀 NAME 🎀

mtk_vdec_h264_copy_scaling_matrix — literally copies a scaling matrix from a control over to the driver. that's it, that's the job, and it does it flawlessly 🫶

✨ SYNOPSIS ✨

void mtk_vdec_h264_copy_scaling_matrix (struct
       slice_api_h264_scaling_matrix *dst_matrix , const struct
       v4l2_ctrl_h264_scaling_matrix *src_matrix );

returns nothing (void), takes two pointers, no drama. periodt.

💖 ARGUMENTS 💖

• dst_matrix — the scaling list params for the HW decoder, aka where the goods are going 🎁
• src_matrix — the scaling list params from a V4L2 control, aka where the goods are coming from 👑

🦋 DESCRIPTION 🦋

so what does this actually do? this function is used to copy the scaling matrix from a v4l2 control into the slice parameters for a decode. that's the whole vibe check — control in, slice params out, decode ready to slay 🔥

🌈 SEE ALSO 🌈

the kernel file it lives in, no cap:

./drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_common.h

and the whole squad of related functions, all linked up like a group chat 💬:

• struct mtk_h264_dpb_info(9)
• struct h264_fb(9)
• mtk_vdec_h264_get_ref_list(9)
• mtk_vdec_h264_get_ctrl_ptr(9)
• mtk_vdec_h264_fill_dpb_info(9)
• mtk_vdec_h264_copy_sps_params(9)
• mtk_vdec_h264_copy_pps_params(9)
• mtk_vdec_h264_copy_slice_hd_params(9)
• mtk_vdec_h264_copy_decode_params(9)
• mtk_vdec_h264_update_dpb(9)
• mtk_vdec_h264_find_start_code(9)
• mtk_vdec_h264_get_mv_buf_size(9)

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fr fr that's the whole page, every last flag and reference accounted for, not me being thorough or anything 🙈

and before you go — cute little sign-off from the footer bestie: this page comes from the source/version path ./drivers/media/platform/media... and it's dated October 2026, page title mtk_vdec_h2...aling_matrix(9) and all. mwah, go decode something gorgeous 💜🧚‍♀️