alsa-rs sequencer bug

main.rs

use alsa::Seq;
use alsa::seq::{PortInfo, Event, EvNote, EvCtrl, PortType, EventType, PortCap};
use std::ffi::CString;
use std::io::stdin;
use std::time::Duration;
use std::thread::sleep;

fn main() {
    let alsa_seq = Seq::open(None, None, true).unwrap();

    let mut portinfo = PortInfo::empty().unwrap();
    let cstr = CString::new("OUT").unwrap();
    portinfo.set_capability(PortCap::READ | PortCap::SUBS_READ);
    portinfo.set_type(PortType::MIDI_GENERIC | PortType::APPLICATION);
    portinfo.set_name(&cstr);
    alsa_seq.create_port(&portinfo).unwrap();
    let outport = portinfo.get_port();

    println!("Connect a rawMIDI receiver and press enter to continue...");
    stdin().read_line(&mut String::new()).unwrap();

    let mut e = create_note_on(outport, 0, 8);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_note_off(outport, 0, 8);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_cc(outport, 0, 8, 127);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_cc(outport, 0, 8, 0);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_sysex_shift_on(outport);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_sysex_shift_off(outport);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_cc(outport, 0, 8, 127);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_cc(outport, 0, 8, 0);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_note_on(outport, 0, 8);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_note_off(outport, 0, 8);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_cc(outport, 0, 8, 127);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

    e = create_cc(outport, 0, 8, 0);
    alsa_seq.event_output_direct(&mut e).unwrap();
    sleep(Duration::from_millis(100));

}

fn create_note_on<'a>(port: i32, channel: u8, note: u8) -> Event<'a> {
    let note = EvNote {
        channel,
        note,
        duration: 0,
        velocity: 127,
        off_velocity: 0,
    };
    let mut e = Event::new(EventType::Noteon, &note);
    e.set_subs();
    e.set_direct();
    e.set_source(port);
    e
}

fn create_note_off<'a>(port: i32, channel: u8, note: u8) -> Event<'a> {
    let note = EvNote {
        channel,
        note,
        duration: 0,
        velocity: 0,
        off_velocity: 0,
    };
    let mut e = Event::new(EventType::Noteon, &note);
    e.set_subs();
    e.set_direct();
    e.set_source(port);
    e
}

fn create_cc<'a>(port: i32, channel: u8, param: u32, value: i32) -> Event<'a> {
    let cc = EvCtrl {
        channel,
        param,
        value,
    };

    let mut e = Event::new(EventType::Controller, &cc);
    e.set_subs();
    e.set_direct();
    e.set_source(port);
    e
}

fn create_sysex_shift_on<'a>(port: i32) -> Event<'a> {
    let data = [
        0xf0, 0x00, 0x21, 0x09, 0x15, 0x00, 0x4d, 0x50, 0x00, 0x01, 0x4d, 0x01, 0xf7,
    ];
    let mut e = Event::new_ext(EventType::Sysex, &data[..]);
    e.set_subs();
    e.set_direct();
    e.set_source(port);
    e.into_owned()
}

fn create_sysex_shift_off<'a>(port: i32) -> Event<'a> {
    let data = [
        0xf0, 0x00, 0x21, 0x09, 0x15, 0x00, 0x4d, 0x50, 0x00, 0x01, 0x4d, 0x00, 0xf7,
    ];
    let mut e = Event::new_ext(EventType::Sysex, &data[..]);
    e.set_subs();
    e.set_direct();
    e.set_source(port);
    e.into_owned()
}