feat: simple virtual port impl

Cargo.toml

@@ -5,3 +5,14 @@ edition = "2021"
 
 [lib]
 
+[[bin]]
+name = "mmp-port"
+path = "src/port/main.rs"
+required-features = ["port"]
+
+[dependencies]
+midi-msg = { version = "0.7", optional = true }
+midir = { version = "0.10", optional = true }
+[features]
+default = []
+port = ["dep:midi-msg", "dep:midir"]

src/port/main.rs

@@ -0,0 +1,40 @@
+use std::error::Error;
+use std::io::Read;
+
+use midi_msg::ControlChange;
+use midir::os::unix::VirtualOutput;
+use midir::MidiOutput;
+
+fn main() {
+	match run() {
+		Ok(_) => (),
+		Err(err) => println!("Error: {}", err),
+	}
+}
+
+fn run() -> Result<(), Box<dyn Error>> {
+	let Some(addr) = std::env::args().nth(1) else {
+		eprintln!("no address provided!");
+		eprintln!("usage: mpp-port 192.168.1.1:8080");
+		return Ok(());
+	};
+
+	let midi_out = MidiOutput::new("mmp")?;
+
+	let mut conn = midi_out.create_virtual("control")?;
+
+	let msg = |control, value| midi_msg::MidiMsg::ChannelVoice {
+		channel: midi_msg::Channel::Ch1,
+		msg: midi_msg::ChannelVoiceMsg::ControlChange {
+			control: ControlChange::CC { control, value, }
+		}
+	};
+
+	let mut stream = std::net::TcpStream::connect(addr)?;
+	let mut buf = [0u8, 0u8];
+
+	loop {
+		stream.read_exact(&mut buf)?;
+		conn.send(&msg(buf[0], buf[1]).to_midi())?;
+	}
+}