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extern crate midir;
use std::thread::sleep;
use std::time::Duration;
use std::io::{stdin, stdout, Write};
use std::error::Error;
use midir::{MidiOutput, MidiOutputPort};
fn main() {
match run() {
Ok(_) => (),
Err(err) => println!("Error: {}", err)
}
}
fn run() -> Result<(), Box<dyn Error>> {
let midi_out = MidiOutput::new("My Test Output")?;
// Get an output port (read from console if multiple are available)
let out_ports = midi_out.ports();
let out_port: &MidiOutputPort = match out_ports.len() {
0 => return Err("no output port found".into()),
1 => {
println!("Choosing the only available output port: {}", midi_out.port_name(&out_ports[0]).unwrap());
&out_ports[0]
},
_ => {
println!("\nAvailable output ports:");
for (i, p) in out_ports.iter().enumerate() {
println!("{}: {}", i, midi_out.port_name(p).unwrap());
}
print!("Please select output port: ");
stdout().flush()?;
let mut input = String::new();
stdin().read_line(&mut input)?;
out_ports.get(input.trim().parse::<usize>()?)
.ok_or("invalid output port selected")?
}
};
println!("\nOpening connection");
let mut conn_out = midi_out.connect(out_port, "midir-test")?;
println!("Connection open. Listen!");
{
// Define a new scope in which the closure `play_note` borrows conn_out, so it can be called easily
let mut play_note = |note: u8, duration: u64| {
const NOTE_ON_MSG: u8 = 0x90;
const NOTE_OFF_MSG: u8 = 0x80;
const VELOCITY: u8 = 0x64;
// We're ignoring errors in here
let _ = conn_out.send(&[NOTE_ON_MSG, note, VELOCITY]);
sleep(Duration::from_millis(duration * 150));
let _ = conn_out.send(&[NOTE_OFF_MSG, note, VELOCITY]);
};
sleep(Duration::from_millis(4 * 150));
play_note(66, 4);
play_note(65, 3);
play_note(63, 1);
play_note(61, 6);
play_note(59, 2);
play_note(58, 4);
play_note(56, 4);
play_note(54, 4);
}
sleep(Duration::from_millis(150));
println!("\nClosing connection");
// This is optional, the connection would automatically be closed as soon as it goes out of scope
conn_out.close();
println!("Connection closed");
Ok(())
}
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