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extern crate midir;
use std::io::{stdin, stdout, Write};
use std::error::Error;
use midir::{MidiInput, MidiOutput, MidiIO, Ignore};
fn main() {
match run() {
Ok(_) => (),
Err(err) => println!("Error: {}", err)
}
}
#[cfg(not(target_arch = "wasm32"))] // conn_out is not `Send` in Web MIDI, which means it cannot be passed to connect
fn run() -> Result<(), Box<dyn Error>> {
let mut midi_in = MidiInput::new("midir forwarding input")?;
midi_in.ignore(Ignore::None);
let midi_out = MidiOutput::new("midir forwarding output")?;
let in_port = select_port(&midi_in, "input")?;
println!();
let out_port = select_port(&midi_out, "output")?;
println!("\nOpening connections");
let in_port_name = midi_in.port_name(&in_port)?;
let out_port_name = midi_out.port_name(&out_port)?;
let mut conn_out = midi_out.connect(&out_port, "midir-forward")?;
// _conn_in needs to be a named parameter, because it needs to be kept alive until the end of the scope
let _conn_in = midi_in.connect(&in_port, "midir-forward", move |stamp, message, _| {
conn_out.send(message).unwrap_or_else(|_| println!("Error when forwarding message ..."));
println!("{}: {:?} (len = {})", stamp, message, message.len());
}, ())?;
println!("Connections open, forwarding from '{}' to '{}' (press enter to exit) ...", in_port_name, out_port_name);
let mut input = String::new();
stdin().read_line(&mut input)?; // wait for next enter key press
println!("Closing connections");
Ok(())
}
fn select_port<T: MidiIO>(midi_io: &T, descr: &str) -> Result<T::Port, Box<dyn Error>> {
println!("Available {} ports:", descr);
let midi_ports = midi_io.ports();
for (i, p) in midi_ports.iter().enumerate() {
println!("{}: {}", i, midi_io.port_name(p)?);
}
print!("Please select {} port: ", descr);
stdout().flush()?;
let mut input = String::new();
stdin().read_line(&mut input)?;
let port = midi_ports.get(input.trim().parse::<usize>()?)
.ok_or("Invalid port number")?;
Ok(port.clone())
}
#[cfg(target_arch = "wasm32")]
fn run() -> Result<(), Box<dyn Error>> {
println!("test_forward cannot run on Web MIDI");
Ok(())
}
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