tek/src/mixer/mod.rs

mod handle;
mod jack;
mod render;
pub use self::handle::*;
pub use self::jack::*;
pub use self::render::*;
use crate::prelude::*;

// TODO:
// - Meters: propagate clipping:
//   - If one stage clips, all stages after it are marked red
//   - If one track clips, all tracks that feed from it are marked red?

pub const ACTIONS: [(&'static str, &'static str);2] = [
    ("+/-",     "Adjust"),
    ("Ins/Del", "Add/remove track"),
];

pub struct Mixer {
    exited:          bool,
    jack:            Jack<Notifications>,
    tracks:          Vec<Track>,
    selected_track:  usize,
    selected_column: usize,
}

pub struct Track {
    name:              String,
    channels:          u8,
    input_ports:       Vec<Port<AudioIn>>,
    pre_gain_meter:    f64,
    gain:              f64,
    insert_ports:      Vec<Port<AudioOut>>,
    return_ports:      Vec<Port<AudioIn>>,
    post_gain_meter:   f64,
    post_insert_meter: f64,
    level:             f64,
    pan:               f64,
    output_ports:      Vec<Port<AudioOut>>,
    post_fader_meter:  f64,
    route:             String,
}

impl Mixer {

    pub fn new () -> Result<Self, Box<dyn Error>> {
        let (client, status) = Client::new(
            "bloop-mixer",
            ClientOptions::NO_START_SERVER
        )?;
        let jack = client.activate_async(
            Notifications,
            ClosureProcessHandler::new(Box::new(
                move |_: &Client, _: &ProcessScope| -> Control {
                    Control::Continue
                }) as Box<dyn FnMut(&Client, &ProcessScope)->Control + Send>
            )
        )?;
        Ok(Self {
            exited:          false,
            selected_column: 0,
            selected_track:  1,
            tracks: vec![
                Track::new(&jack.as_client(), 1, "Kick")?,
                Track::new(&jack.as_client(), 1, "Snare")?,
                Track::new(&jack.as_client(), 2, "Hihats")?,
                Track::new(&jack.as_client(), 2, "Sample")?,
                Track::new(&jack.as_client(), 2, "Bus 1")?,
                Track::new(&jack.as_client(), 2, "Bus 2")?,
                Track::new(&jack.as_client(), 2, "Mix")?,
            ],
            jack,
        })
    }

}

impl Track {
    pub fn new (jack: &Client, channels: u8, name: &str) -> Result<Self, Box<dyn Error>> {
        let mut input_ports  = vec![];
        let mut insert_ports = vec![];
        let mut return_ports = vec![];
        let mut output_ports = vec![];
        for channel in 1..=channels {
            input_ports.push(jack.register_port(&format!("{name} [input {channel}]"),   AudioIn::default())?);
            output_ports.push(jack.register_port(&format!("{name} [out {channel}]"),    AudioOut::default())?);
            let insert_port = jack.register_port(&format!("{name} [pre {channel}]"),    AudioOut::default())?;
            let return_port = jack.register_port(&format!("{name} [insert {channel}]"), AudioIn::default())?;
            jack.connect_ports(&insert_port, &return_port)?;
            insert_ports.push(insert_port);
            return_ports.push(return_port);
        }
        Ok(Self {
            name:              name.into(),
            channels,
            input_ports,
            pre_gain_meter:    0.0,
            gain:              0.0,
            post_gain_meter:   0.0,
            insert_ports,
            return_ports,
            post_insert_meter: 0.0,
            level:             0.0,
            pan:               0.0,
            post_fader_meter:  0.0,
            route:             "---".into(),
            output_ports,
        })
    }
}

impl Exitable for Mixer {
    fn exit (&mut self) {
        self.exited = true
    }
    fn exited (&self) -> bool {
        self.exited
    }
}