nal_hevc_write_filler(9)

💖 nal_hevc_write_filler(9) 💖

okay bestie, welcome to the Kernel API Manual — this one's short but it's lowkey iconic. we're writing filler data, and yes, filler can slay. ✨

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✨ NAME ✨

nal_hevc_write_filler — write filler data RBSP 🎀

🌸 SYNOPSIS 🌸

ssize_t nal_hevc_write_filler (const struct device *dev , void *dest ,
       size_t n );

🦋 ARGUMENTS 🦋

• dev — device pointer. yeah, the device. it's giving "who am I? the device." 💅
• dest — buffer to fill with filler data. this is where the filler goes, bestie 🫶
• n — size of the buffer to fill with filler data. how many bytes of filler we're serving up 🍓

👑 DESCRIPTION 👑

so what this does: it writes a filler data RBSP to dest with a size of n bytes, then returns the number of written filler data bytes. literally that simple, no cap ✨

Use this function to generate dummy data in an RBSP data stream that can be safely ignored by hevc decoders. not me writing data that everyone just agrees to ignore 😭 it's giving "background character energy" but honestly? needed. the stream stays valid, the decoders stay unbothered, everyone wins 💜

The RBSP format of the filler data is specified in Rec. ITU-T H.265 (02/2018) 7.3.2.8 Filler data RBSP syntax — so if you wanna get into the nitty-gritty of the format, that's your reference, iykyk 📖

🧚 RETURN 🧚

number of filler data bytes (including marker) or negative error. so either you get your byte count — marker included, don't forget the marker!! — or you get a negative error and it's giving 😭💀

🌈 SEE ALSO 🌈

• Kernel file ./drivers/media/platform/allegro-dvt/nal-hevc.c — the source itself, go read it bestie, it ate 🔥
• nal_hevc_write_vps(9) — write VPS 👑
• nal_hevc_read_vps(9) — read VPS 💖
• nal_hevc_write_sps(9) — write SPS ✨
• nal_hevc_read_sps(9) — read SPS 🌸
• nal_hevc_write_pps(9) — write PPS 🎀
• nal_hevc_read_pps(9) — read PPS 🦋
• nal_hevc_read_filler(9) — read filler, the mirror of this whole vibe 🫶

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lowkey reminder: n is the size of the buffer, and the return is the number of bytes written including the marker — don't mix those up, bestie, fr fr 💅

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that's the whole page!! brought to you by ./drivers/media/platform/alleg... (yes it's truncated in the footer, she's mysterious like that 🌈), October 2026 era — and the page name itself is nal_hevc_write_filler(9), so you always know exactly where you are 💜 mwah, go write some filler, periodt 💅✨