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