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