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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2026 metamuffin <metamuffin.org>
*/
use std::fmt::Write;
pub(super) fn hevc_codec_param(cp: &[u8]) -> String {
let general_profile_space = cp[1] >> 6;
let general_tier_flag = (cp[1] >> 5) & 0b1;
let general_profile_idc = cp[1] & 0b11111;
let general_level_idc = cp[12];
let general_profile_compatibility_flag =
u32::from_be_bytes([cp[2], cp[3], cp[4], cp[5]]).reverse_bits();
let mut d = String::new();
let trailing_zeroes = cp[6..12].iter().rev().take_while(|x| **x == 0).count();
for &flag in &cp[6..12 - trailing_zeroes] {
write!(d, ".{flag:02x}").unwrap();
}
format!(
"hvc1.{}{}.{:x}.{}{}{d}",
match general_profile_space {
0 => "",
1 => "A",
2 => "B",
3 => "C",
_ => unreachable!(),
},
general_profile_idc,
general_profile_compatibility_flag,
match general_tier_flag {
0 => 'L',
1 => 'H',
_ => unreachable!(),
},
general_level_idc,
)
}
#[test]
fn sample1() {
let cp = [
0x01, 0x02, 0x20, 0x00, 0x00, 0x00, 0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3F,
];
assert_eq!(hevc_codec_param(&cp), "hvc1.2.4.L63.90")
}
#[test]
fn sample2() {
let cp = [
0x01, 0x01, 0x60, 0x00, 0x00, 0x00, 0xB0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78,
];
assert_eq!(hevc_codec_param(&cp), "hvc1.1.6.L120.b0")
}
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