v4l2_calc_aspect_ratio(9)

✨ v4l2_calc_aspect_ratio ✨

okay so bestie, welcome to the Kernel API Manual 💖 this page is all about v4l2_calc_aspect_ratio(9) and honestly? it's a little niche but it serves. stay with me, i gotchu 🫶

🌸 NAME 🌸

v4l2_calc_aspect_ratio — literally just calculates the aspect ratio based on bytes 0x15 and 0x16 from the EDID 💅 no cap, that's the whole job.

🎀 SYNOPSIS 🎀

struct v4l2_fract v4l2_calc_aspect_ratio (u8 hor_landscape , u8 vert_portrait );

like, look at that signature. iconic. the way it returns a struct v4l2_fract and takes two u8s… chef's kiss 🔥

🦋 ARGUMENTS 🦋

• hor_landscape — bestie this is byte 0x15 from the EDID ✨ that's it, that's the whole vibe.
• vert_portrait — and this one is byte 0x16 from the EDID 💖 matching set, we love to see it 🎀

💜 DESCRIPTION 💜

so what does it actually do? it determines the aspect ratio from the EDID 🌈 that's the whole main character energy of this function.

and if you wanna go deeper (iykyk), the receipts are in the VESA Enhanced EDID standard, release A, rev 2, section 3.6.2: "Horizontal and Vertical Screen Size or Aspect Ratio" ⭐ like yes, they really named a whole section that and honestly? valid.

lowkey if you're out here reading EDID bytes for fun, you're already in too deep and i respect that fr fr 🙈

🧚 SEE ALSO 🧚

okay so there's a whole friend group here, all hanging out in the kernel file ./include/media/v4l2-dv-timings.h 👑 go say hi to:

• v4l2_calc_timeperframe(9)
• v4l2_check_dv_timings_fnc(9)
• v4l2_valid_dv_timings(9)
• v4l2_enum_dv_timings_cap(9)
• v4l2_find_dv_timings_cap(9)
• v4l2_find_dv_timings_cea861_vic(9)
• v4l2_match_dv_timings(9)
• v4l2_print_dv_timings(9)
• v4l2_detect_cvt(9)
• v4l2_detect_gtf(9)
• v4l2_dv_timings_aspect_ratio(9)
• can_reduce_fps(9)
• struct v4l2_hdmi_colorimetry(9)

and before you go — this page lives in ./include/media, it's the October 2026 edition, and it's filed under v4l2_calc_aspect_ratio(9) 💅 slay, you read the whole thing, so proud of you bestie 💖✨🎀