106 lines
2.9 KiB
Rust
106 lines
2.9 KiB
Rust
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#![allow(incomplete_features)]
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#![feature(generic_associated_types)]
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#![feature(min_specialization)]
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use serde::{Deserialize, Serialize};
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use baseplug::{event::Data, Event, Plugin, ProcessContext};
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baseplug::model! {
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#[derive(Debug, Serialize, Deserialize)]
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struct MidiOutMetronomeModel {
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#[model(min = 0.5, max = 2.0)]
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#[parameter(name = "len")]
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len: f32,
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}
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}
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impl Default for MidiOutMetronomeModel {
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fn default() -> Self {
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Self { len: 1.0 }
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}
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}
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struct MidiOutMetronome {
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note_on: bool,
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on_ct: u64,
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frame_ct: u64,
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}
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impl Plugin for MidiOutMetronome {
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const NAME: &'static str = "midi out metronome plug";
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const PRODUCT: &'static str = "midi out metronome plug";
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const VENDOR: &'static str = "spicy plugins & co";
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const INPUT_CHANNELS: usize = 2;
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const OUTPUT_CHANNELS: usize = 2;
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type Model = MidiOutMetronomeModel;
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fn new(_sample_rate: f32, _model: &Self::Model) -> Self {
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Self {
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note_on: false,
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on_ct: 0,
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frame_ct: 0,
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}
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}
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fn process<'proc>(&mut self, model: &MidiOutMetronomeModelProcess,
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ctx: &'proc mut ProcessContext<Self>)
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{
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let output = &mut ctx.outputs[0].buffers;
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let enqueue_midi = &mut ctx.enqueue_event;
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// get the current beat and tempo
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let curr_bpm = ctx.musical_time.bpm;
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let is_playing = ctx.musical_time.is_playing;
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for i in 0..ctx.nframes {
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// write silence
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output[0][i] = 0.0;
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output[1][i] = 0.0;
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// calc
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let beat_in_ms = 60_000.0 / curr_bpm;
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let beat_in_samples = beat_in_ms * ctx.sample_rate as f64 / 1000.0;
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let sixth_in_samples = (beat_in_samples / 4.0) * model.len[i] as f64;
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let beat_in_samples = beat_in_samples.round() as u64;
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let sixth_in_samples = sixth_in_samples.round() as u64;
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if is_playing && self.frame_ct % beat_in_samples == 0 {
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// send a note on (C2)
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let note_on = Event::<MidiOutMetronome> {
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frame: i,
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data: Data::Midi([144, 36, 120]),
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};
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enqueue_midi(note_on);
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self.note_on = true;
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self.on_ct = 0;
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}
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if is_playing && self.note_on && self.on_ct == sixth_in_samples {
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// send a note off (C2)
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let note_off = Event::<MidiOutMetronome> {
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frame: i,
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data: Data::Midi([128, 36, 0]),
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};
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enqueue_midi(note_off);
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self.note_on = false;
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}
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if is_playing {
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if self.note_on {
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self.on_ct += 1;
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}
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self.frame_ct += 1;
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} else {
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self.frame_ct = 0;
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}
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}
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}
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}
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baseplug::vst2!(MidiOutMetronome, b"~MM~");
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