tek/plugin/vst/examples/fwd_midi.rs

#[macro_use]
extern crate vst;

use vst::api;
use vst::prelude::*;

plugin_main!(MyPlugin); // Important!

#[derive(Default)]
struct MyPlugin {
    host: HostCallback,
    recv_buffer: SendEventBuffer,
    send_buffer: SendEventBuffer,
}

impl MyPlugin {
    fn send_midi(&mut self) {
        self.send_buffer
            .send_events(self.recv_buffer.events().events(), &mut self.host);
        self.recv_buffer.clear();
    }
}

impl Plugin for MyPlugin {
    fn new(host: HostCallback) -> Self {
        MyPlugin {
            host,
            ..Default::default()
        }
    }

    fn get_info(&self) -> Info {
        Info {
            name: "fwd_midi".to_string(),
            unique_id: 7357001, // Used by hosts to differentiate between plugins.
            ..Default::default()
        }
    }

    fn process_events(&mut self, events: &api::Events) {
        self.recv_buffer.store_events(events.events());
    }

    fn process(&mut self, buffer: &mut AudioBuffer<f32>) {
        for (input, output) in buffer.zip() {
            for (in_sample, out_sample) in input.iter().zip(output) {
                *out_sample = *in_sample;
            }
        }
        self.send_midi();
    }

    fn process_f64(&mut self, buffer: &mut AudioBuffer<f64>) {
        for (input, output) in buffer.zip() {
            for (in_sample, out_sample) in input.iter().zip(output) {
                *out_sample = *in_sample;
            }
        }
        self.send_midi();
    }

    fn can_do(&self, can_do: CanDo) -> vst::api::Supported {
        use vst::api::Supported::*;
        use vst::plugin::CanDo::*;

        match can_do {
            SendEvents | SendMidiEvent | ReceiveEvents | ReceiveMidiEvent => Yes,
            _ => No,
        }
    }
}