midi.rs

use bitfield_struct::bitfield;

#[bitfield(u8)]
struct Status {
    #[bits(4)]
    tag: u8,
    #[bits(4)]
    channel: u8,
}

enum Tags {
    NoteOff,
    NoteOn,
    Cc,
    PitchBend,
}

fn parse_status(status: u8) -> Option<(Tags, u8)> {
    let status = Status::from(status);
    use Tags::*;
    let tag = match status.tag() {
        0x8 => NoteOff,
        0x9 => NoteOn,
        0xB => Cc,
        0xE => PitchBend,
        _ => return None,
    };
    Some((tag, status.channel()))
}