/*
    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>
*/

#[allow(unused)]
mod frame_type {
    pub const KEY_FRAME: u8 = 0;
    pub const NON_KEY_FRAME: u8 = 0;
}

pub fn is_keyframe(s: &[u8]) -> Option<bool> {
    let frame_marker = (s[0] >> 6) & 0b11;
    assert_eq!(frame_marker, 2);
    let profile_low_bit = (s[0] >> 5) & 0b1;
    let profile_high_bit = (s[0] >> 4) & 0b1;
    let profile = (profile_high_bit << 1) | profile_low_bit;
    if profile == 3 {
        todo!()
    }
    let show_existing_frame = (s[0] >> 3) & 0b1 != 0;
    if show_existing_frame {
        todo!()
    }
    let frame_type = (s[0] >> 2) & 0b1;
    Some(frame_type == frame_type::KEY_FRAME)
}