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//! Stream of notes
use crate::messages::Status;
use crate::midi::MidiSend;
use crate::music::duration::Duration;
use crate::music::note::Note;
use crate::music::time::Time;
use itertools::Itertools;
use midir::MidiOutputConnection;
use tokio::time::{self, Duration as TDuration};
/// Temporal arrangement of events
#[derive(Debug, Default, Clone)]
pub struct Stream {
pub events: Vec<Event>,
}
/// An event is a timed command
#[derive(Clone, Debug)]
pub struct Event {
time: Time,
status: Status,
note: Note,
}
impl Event {
pub fn new(time: Time, status: Status, note: Note) -> Self {
Event { time, status, note }
}
}
impl Stream {
/// Creates a new empty `Stream` with no events.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// use mumuse::music::stream::Stream;
/// let s = Stream::new();
/// ```
pub fn new() -> Self {
Self { events: vec![] }
}
/// Adds event to stream
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// use mumuse::music::{time::Time, note::Note, stream::{Stream, Event}};
/// use mumuse::messages::Status;
/// let mut stream: Stream = Stream::new();
/// let time: Time = Time::new(1, 16, 1);
/// let note: Note = Note::try_from("A3").unwrap();
/// stream.add_event(Event::new(time, Status::NoteOn, note));
/// ```
pub fn add_event(&mut self, event: Event) {
self.events.push(event);
}
/// Adds note to stream
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// use mumuse::music::{time::Time, note::Note, stream::Stream, duration::Duration};
/// let mut stream: Stream = Stream::new();
/// let note: Note = Note::try_from("A3").unwrap();
/// let time: Time = Time::new(1, 16, 1);
/// let duration: Duration = Duration::new(16, 1);
/// stream.add_note(note, time, duration);
/// ```
pub fn add_note(&mut self, note: Note, time: Time, duration: Duration) {
println!("{:?} + {:?} = {:?}", time, duration, time + duration);
self.events.push(Event::new(time, Status::NoteOn, note));
self.events
.push(Event::new(time + duration, Status::NoteOff, note))
}
/// Converts Events to seconds timeline
///
/// In order to convert the stream with `Time` events, one need to declare a `bpm`
/// (beats per minutes) and a `bpb` (beats per bar).
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// use mumuse::music::{time::Time, note::Note, stream::Stream, duration::Duration};
/// let mut stream: Stream = Stream::new();
/// let note: Note = Note::try_from("A3").unwrap();
/// let time: Time = Time::new(1, 16, 1);
/// let duration: Duration = Duration::new(16, 1);
/// stream.add_note(note, time, duration);
/// let stream_seconds = stream.to_seconds(120.0, 4);
/// ```
pub fn to_seconds(&self, bpm: f64, bpb: u32) -> Vec<(f64, Status, Note)> {
let mut events_seconds: Vec<(f64, Status, Note)> = vec![];
for event in self.events.iter() {
events_seconds.push((event.time.to_seconds(bpm, bpb), event.status, event.note));
}
// Sort by time
events_seconds.sort_by(|a, b| a.0.partial_cmp(&b.0).unwrap());
events_seconds
}
/// Plays stream of events in real time
///
/// Use ticking for playing the stream of events at regular intervals.
/// For each tick, the events with Time to seconds lying in the tick window are
/// sent as MIDI.
/// The `bpm` (beats per minutes) and `bpb` (beats per bar) are needed for the conversion
/// to seconds.
#[tokio::main]
pub async fn play(&self, conn_out: &mut MidiOutputConnection, bpm: f64, bpb: u32) {
let events_seconds = self.to_seconds(bpm, bpb); // Vector of events with seconds unit
let interval_time = 10.0; // in ms
let mut played_events = 0; // Count of sent event
let mut n_tick = 0; // Tick number counter
let total_events = events_seconds.len(); // Number of total events to send
let mut interval = time::interval(TDuration::from_millis(interval_time as u64));
// Async function to send midi events with constant tick time
// Constant tick time is managed by Tokio interval ticking with Burst missed tick strategy
// Tick time is set to 10ms here, adjust for more / less precision in event timing
async fn play_events(
conn_out: &mut MidiOutputConnection,
n_tick: usize,
interval_time: f64,
events_seconds: &Vec<(f64, Status, Note)>,
) -> usize {
let last_tick_time = n_tick as f64 * interval_time / 1000.0; // in sec
let next_tick_time = (n_tick + 1) as f64 * interval_time / 1000.0; // in sec
// Filter out events that to not belong to current tick window
// Could be smarter by removing past events
let current_events = events_seconds
.iter()
.filter(|event| (event.0 >= last_tick_time) && (event.0 < next_tick_time))
.collect_vec();
// Send events, currently only NoteOn and Note Off are handled.
// Add match arms for additional case handling
for current_event in ¤t_events {
match current_event.1 {
Status::NoteOn => current_event.2.send_midi(Status::NoteOn, conn_out),
Status::NoteOff => current_event.2.send_midi(Status::NoteOff, conn_out),
_ => (),
};
println!("sent {:?}", current_event);
}
current_events.len()
}
loop {
// We tick until all events are sent
interval.tick().await;
played_events += play_events(conn_out, n_tick, interval_time, &events_seconds).await;
if total_events == played_events {
break;
}
n_tick += 1;
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn add_event() {
let mut stream: Stream = Stream::new();
let time: Time = Time::new(1, 16, 1);
let note: Note = Note::try_from("A3").unwrap();
stream.add_event(Event::new(time, Status::NoteOn, note));
assert_eq!(stream.events.get(0).unwrap().time.bar, 1);
assert_eq!(stream.events.get(0).unwrap().time.divisions, 16);
assert_eq!(stream.events.get(0).unwrap().time.position, 1);
}
#[test]
fn sort_stream_time() {
let mut stream: Stream = Stream::new();
let note: Note = Note::try_from("A3").unwrap();
// Unordered declaration of events
stream.add_event(Event::new(Time::new(1, 4, 4), Status::NoteOn, note));
stream.add_event(Event::new(Time::new(1, 4, 3), Status::NoteOn, note));
stream.add_event(Event::new(Time::new(1, 4, 2), Status::NoteOn, note));
stream.add_event(Event::new(Time::new(1, 4, 1), Status::NoteOn, note));
// time_stream time should be ordered
let time_stream = stream.to_seconds(120.0, 4);
assert!(time_stream[0].0 < time_stream[1].0);
assert!(time_stream[1].0 < time_stream[2].0);
assert!(time_stream[2].0 < time_stream[3].0);
}
}