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Denis Redozubov 2023-06-16 20:54:40 +04:00
parent b89debcbd7
commit 9ad78242c5
2 changed files with 239 additions and 162 deletions
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2
src/bin/main.rs
View file

@ -54,8 +54,6 @@ fn validate_and_parse_part(
None => {}
Some(pattern) => match dsl::groups(pattern.as_str()) {
Ok((_, groups)) => {
println!("{:?}: {:?}", part, groups);
// println!("group to 128th: {}", group.to_128th());
patterns.insert(part, groups);
}
Err(_) => {

399
src/midi/core.rs
View file

@ -1,10 +1,9 @@
extern crate derive_more;
use std::cmp::Ordering;
use std::cmp::Ordering::*;
use std::collections::BTreeMap
;
use std::collections::BTreeMap;
use std::iter::Peekable;
use std::ops::{Add, Mul};
use std::ops::{Add, Mul, Sub};
use std::str::FromStr;
use midly::{
@ -13,8 +12,8 @@ use midly::{
use midly::{MetaMessage, TrackEvent};
use crate::dsl::dsl::{
group_or_delimited_group, groups, BasicLength, Group, GroupOrNote, Groups, KnownLength, Length,
ModdedLength, Note, Times, flatten_group,
flatten_group, group_or_delimited_group, groups, BasicLength, Group, GroupOrNote, Groups,
KnownLength, Length, ModdedLength, Note, Times, SIXTEENTH,
};
use crate::midi::time::TimeSignature;
use GroupOrNote::*;
@ -111,6 +110,12 @@ pub struct Event<T> {
event_type: EventType,
}
impl<T> Event<T> {
pub fn new(tick: T, event_type: EventType) -> Event<T> {
Event { tick, event_type }
}
}
impl<T> PartialOrd for Event<T>
where
T: PartialOrd + Ord,
@ -183,7 +188,26 @@ pub struct EventGrid<T> {
events: Vec<Event<T>>,
/// Length of the note group in Ticks. Rests are implicit, so it's necessary to know
/// the length of the note group to cycle it.
length: Tick,
start: Tick,
end: Tick,
}
impl EventGrid<Tick> {
pub fn new(events: Vec<Event<Tick>>, end: Tick) -> EventGrid<Tick> {
let start = if events.len() == 0 {
Tick(0)
} else {
match events.first() {
Some(x) => x.tick,
None => Tick(0)
}
};
EventGrid {
events,
start: start,
end: end,
}
}
}
impl<T> IntoIterator for EventGrid<T> {
@ -203,71 +227,42 @@ impl<T> EventGrid<T> {
impl<T> EventGrid<T>
where
T: Clone
T: Clone,
{
pub fn extend(&self, other: &EventGrid<T>) -> EventGrid<T> {
let combined = self.events.iter().cloned().chain(other.events.iter().cloned()).collect();
EventGrid { events: combined, length: self.length + other.length }
pub fn unsafe_extend(&self, other: &EventGrid<T>) -> EventGrid<T> {
let combined = self
.events
.iter()
.cloned()
.chain(other.events.iter().cloned())
.collect();
EventGrid {
events: combined,
end: self.end + other.end,
start: self.start,
}
}
}
// FIXME: add a mutable version for use in `groups_to_event_grid`
/// Adds two EventGrids together, manipulates the time of the right `EventGrid` by
/// adding the length of the left one to timings.
/// If you need to concat two `EventGrid`s without messing up with times, then use `extend`.
impl<T: Add<Tick, Output = T> + Clone + Ord + std::fmt::Debug> Add for EventGrid<T> {
type Output = EventGrid<T>;
fn add(mut self, other: EventGrid<T>) -> EventGrid<T> {
let other_events: Vec<Event<T>> = other
.events
.into_iter()
.map(|mut e| {
e.tick = e.tick + self.length;
e
})
.collect();
self.events.extend(other_events);
self.events.sort();
self.length = self.length + other.length;
self
}
}
impl<T: Clone + Ord> Mul for EventGrid<T> {
type Output = EventGrid<T>;
fn mul(mut self, other: EventGrid<T>) -> EventGrid<T> {
let other_events: Vec<Event<T>> = other.events;
self.events.extend(other_events);
self.events.sort();
self.length = self.length + other.length;
self
/// If you need to concat two `EventGrid`s without messing up with times, then use `unsafe_extend`.
impl EventGrid<Tick> {
fn extend(&self, other: EventGrid<Tick>) -> EventGrid<Tick> {
// FIXME: get rid of unnecessary cloning
let other_events = other.clone().events.into_iter().map(|mut e| {
e.tick = e.tick + self.end;
e
});
let mut self_event_copy = self.events.clone();
self_event_copy.extend(other_events);
EventGrid { events: self_event_copy, start: self.start, end: self.start + self.length() + other.length()}
}
}
#[test]
fn test_arith_event_grids() {
let eg1 = EventGrid {
events: vec![Event { tick: Tick(0), event_type: NoteOn(KickDrum) }, Event { tick: Tick(TICKS_PER_QUARTER_NOTE as u128), event_type: NoteOff(KickDrum) }],
length: Tick(TICKS_PER_QUARTER_NOTE as u128),
};
let eg2 = EventGrid {
events: vec![Event { tick: Tick(24), event_type: NoteOn(HiHat) }, Event { tick: Tick(TICKS_PER_QUARTER_NOTE as u128), event_type: NoteOff(HiHat) }],
length: Tick(TICKS_PER_QUARTER_NOTE as u128),
};
let mul_res = EventGrid {
events: vec![Event { tick: Tick(0), event_type: NoteOn(KickDrum) }, Event { tick: Tick(24), event_type: NoteOn(HiHat) }, Event { tick: Tick(48), event_type: NoteOff(KickDrum) }, Event { tick: Tick(48), event_type: NoteOff(HiHat) }],
length: Tick(96),
};
assert_eq!(eg1.clone() * eg2.clone(), mul_res);
}
#[test]
fn test_add_event_grid() {
fn test_extend_event_grid() {
let empty: EventGrid<Tick> = EventGrid::empty();
let kick_on = Event {
tick: Tick(0),
@ -279,34 +274,66 @@ fn test_add_event_grid() {
};
let simple_grid = EventGrid {
events: vec![kick_on, kick_off],
length: Tick(48),
start: Tick(0),
end: Tick(48),
};
assert_eq!(empty.clone() + empty.clone(), empty);
assert_eq!(simple_grid.clone() + empty.clone(), simple_grid);
assert_eq!(empty.clone() + simple_grid.clone(), simple_grid);
assert_eq!(empty.clone().extend(empty.clone()), empty);
assert_eq!(simple_grid.clone().extend(empty.clone()), simple_grid);
assert_eq!(empty.clone().extend(simple_grid.clone()), simple_grid);
assert_eq!(
simple_grid.clone() + simple_grid.clone(),
simple_grid.clone().extend(simple_grid.clone()),
EventGrid {
events: vec![Event { tick: Tick(0), event_type: NoteOn(KickDrum) }, Event { tick: Tick(24), event_type: NoteOff(KickDrum) }, Event { tick: Tick(48), event_type: NoteOn(KickDrum) }, Event { tick: Tick(72), event_type: NoteOff(KickDrum) }],
length: Tick(96)
start: Tick(0),
end: Tick(96)
}
);
let events = EventGrid { events: vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }], length: Tick(144)};
let expected = EventGrid { events: vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(144+24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(144+48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(144+96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(144+120), event_type: NoteOff(SnareDrum) }], length: Tick(144*2) };
assert_eq!(events.clone() + events.clone(), expected);
let events = EventGrid {
events: vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }],
start: Tick(24),
end: Tick(144),
};
let expected = EventGrid {
events: vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(144 + 24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(144 + 48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(144 + 96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(144 + 120), event_type: NoteOff(SnareDrum) }],
start: Tick(24),
end: Tick(264),
};
assert_eq!(events.extend(events.clone()), expected);
let events2_1 = EventGrid::new(
vec![
Event::new(Tick(0), NoteOn(CrashCymbal)),
Event::new(Tick(96), NoteOff(CrashCymbal)),
],
Tick(96),
);
let events2_2: EventGrid<Tick> = EventGrid { events: vec![], start: Tick(96), end: Tick(192) };
let result2 = EventGrid::new(events2_1.events.clone(), Tick(192));
assert_eq!(events2_1.extend(events2_2), result2);
let events3 = EventGrid { events: Vec::new(), start: Tick(96), end: Tick(144) };
assert_eq!(
events3.extend(events3.clone()),
EventGrid { events: Vec::new(), start: Tick(96), end: Tick(192) }
);
}
impl<T> EventGrid<T> {
fn empty() -> Self {
EventGrid {
events: Vec::new(),
length: Tick(0),
start: Tick(0),
end: Tick(0),
}
}
}
impl EventGrid<Tick> {
pub fn length(&self) -> Tick {
self.end - self.start
}
/// Converts a single-track(!!!!) sorted `EventGrid<Tick>`
pub fn to_delta(&self) -> EventGrid<Delta> {
let mut time = Tick(0);
@ -430,19 +457,13 @@ fn group_to_event_grid(
let mut time = start.clone();
let note_length = length.to_ticks();
let mut grid = EventGrid::empty();
grid.start = *start;
notes.iter().for_each(|entry| {
match entry {
// SingleGroup(group) => {
// let mut eg = group_to_event_grid(&group, part, &time.clone());
// println!("SINGLE GROUP EVENTGRID: {:?}", eg);
// grid.events.append(&mut eg.events);
// grid.length = grid.length + eg.length;
// time = time + grid.length;
// }
Note::Rest => {
let rest_end = time + note_length;
time = rest_end;
grid.length = rest_end;
grid.end = rest_end;
}
Note::Hit => {
let note_end = time + note_length;
@ -456,60 +477,88 @@ fn group_to_event_grid(
};
grid.events.push(note_on);
grid.events.push(note_off);
grid.length = note_end;
grid.end = note_end;
time = note_end;
}
};
});
grid.events.sort();
println!("GRID before cycling: {:?}", grid);
// FIXME: this one fails. Either fix the cycle_grid and underlying operations (best) or reimplement a hack here(worst)
cycle_grid(grid, *times)
}
#[test]
fn test_group_to_event_grid() {
let start_time = Tick(0);
assert_eq!(
group_to_event_grid(
flatten_group(group_or_delimited_group("(2,8x--)").unwrap().1).0.first().unwrap(),
KickDrum,
&start_time
),
EventGrid { events: vec![Event { tick: Tick(0), event_type: NoteOn(KickDrum) }, Event { tick: Tick(24), event_type: NoteOff(KickDrum) }, Event { tick: Tick(72), event_type: NoteOn(KickDrum) }, Event { tick: Tick(96), event_type: NoteOff(KickDrum) }], length: Tick(144) }
);
let start_time = Tick(12);
let group = Group {
notes: vec![Note::Hit],
length: SIXTEENTH.clone(),
times: Times(15),
};
let grid = EventGrid {
events: vec![],
start: start_time,
end: Tick(192),
};
assert_eq!(group_to_event_grid(&group, HiHat, &start_time), grid);
// assert_eq!(
// group_to_event_grid(
// flatten_group(group_or_delimited_group("(2,8x--)").unwrap().1).0.first().unwrap(),
// KickDrum,
// &start_time
// ),
// EventGrid { events: vec![Event { tick: Tick(0), event_type: NoteOn(KickDrum) }, Event { tick: Tick(24), event_type: NoteOff(KickDrum) }, Event { tick: Tick(72), event_type: NoteOn(KickDrum) }, Event { tick: Tick(96), event_type: NoteOff(KickDrum) }], length: Tick(144) }
// );
}
fn cycle_grid(event_grid: EventGrid<Tick>, times: Times) -> EventGrid<Tick> {
let mut grid = EventGrid::empty();
for _ in 1..(times.0 + 1) {
grid = grid + event_grid.clone();
if times.0 <= 0 {
EventGrid::empty()
} else {
// FIXME: think about unnecessary cloning
(0..).take((times.0 - 1) as usize).fold(event_grid.clone(), |acc, _| acc.extend(event_grid.clone()))
}
grid
}
#[test]
fn test_cycle_grid() {
let empty: EventGrid<Tick> = EventGrid::empty();
assert_eq!(cycle_grid(EventGrid::empty(), Times(2)), empty);
let kick_on = Event { tick: Tick(0), event_type: NoteOn(KickDrum) };
let kick_off = Event { tick: Tick(24), event_type: NoteOff(KickDrum) };
let simple_grid = EventGrid { events: vec![kick_on, kick_off], length: Tick(48) };
assert_eq!(cycle_grid(simple_grid.clone(), Times(0)), empty);
assert_eq!(cycle_grid(simple_grid.clone(), Times(1)), simple_grid);
assert_eq!(
cycle_grid(simple_grid.clone(), Times(2)),
EventGrid {
events: vec![
Event { tick: Tick(0), event_type: NoteOn(KickDrum) },
Event { tick: Tick(24), event_type: NoteOff(KickDrum) },
Event { tick: Tick(48), event_type: NoteOn(KickDrum) },
Event { tick: Tick(72), event_type: NoteOff(KickDrum) }
],
length: Tick(96)
}
cycle_grid(EventGrid { events: vec![Event { tick: Tick(12), event_type: NoteOn(HiHat) }, Event { tick: Tick(24), event_type: NoteOff(HiHat) }], start: Tick(12), end: Tick(24) }, Times(15)),
EventGrid::empty()
);
let events = EventGrid { events: vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }], length: Tick(144)};
let expected = EventGrid { events: vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(144+24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(144+48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(144+96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(144+120), event_type: NoteOff(SnareDrum) }], length: Tick(144*2) };
assert_eq!(
cycle_grid(EventGrid { events: Vec::new(), start: Tick(96), end: Tick(144) }, Times(2)),
EventGrid { events: Vec::new(), start: Tick(96), end: Tick(192) }
);
let empty: EventGrid<Tick> = EventGrid::empty();
assert_eq!(cycle_grid(EventGrid::empty(), Times(2)), empty);
let simple_grid = EventGrid { events: vec![Event { tick: Tick(0), event_type: NoteOn(KickDrum) }, Event { tick: Tick(24), event_type: NoteOff(KickDrum) }],
start: Tick(0),
end: Tick(48),
};
assert_eq!(cycle_grid(simple_grid.clone(), Times(0)), empty);
assert_eq!(cycle_grid(simple_grid.clone(), Times(1)), simple_grid);
assert_eq!(
cycle_grid(simple_grid.clone(), Times(2)),
EventGrid::new(
vec![Event { tick: Tick(0), event_type: NoteOn(KickDrum) }, Event { tick: Tick(24), event_type: NoteOff(KickDrum) }, Event { tick: Tick(48), event_type: NoteOn(KickDrum) }, Event { tick: Tick(72), event_type: NoteOff(KickDrum) }],
Tick(96)
)
);
let events = EventGrid::new(
vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }],
Tick(144),
);
let expected = EventGrid::new(
vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(144 + 24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(144 + 48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(144 + 96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(144 + 120), event_type: NoteOff(SnareDrum) }],
Tick(264),
);
assert_eq!(cycle_grid(events.clone(), Times(2)), expected);
}
@ -522,11 +571,17 @@ fn groups_to_event_grid(part: Part, groups: &Groups) -> EventGrid<Tick> {
// `group_to_event_grid` doesn't know at which point in time groups starts unless we pass
// `time` explicitly. Only the first `Group` in `Groups` starts at zero.
let flattened_group = group_to_event_grid(group, part, &time);
println!("(groups_to_event_grid) FLATTENED GROUP: {:?}", flattened_group);
if part == CrashCymbal {
println!("GROUPS: {:?}", groups);
println!(
"(groups_to_event_grid) FLATTENED GROUP TIME: {:?} - {:?}",
part, flattened_group
);
}
// Note that using `+` is wrong here as it's messing with timings and it really shouldn't
grid = grid.extend(&flattened_group);
time = grid.length;
grid = grid.extend(flattened_group);
time = grid.end;
});
grid
}
@ -594,12 +649,18 @@ impl Iterator for EventIterator {
fn test_event_iterator_impl() {
let empty = EventGrid::empty();
let kick1 = group_to_event_grid(
&flatten_group(group_or_delimited_group("(4x-)").unwrap().1).0.first().unwrap(),
&flatten_group(group_or_delimited_group("(4x-)").unwrap().1)
.0
.first()
.unwrap(),
KickDrum,
&mut Tick(0),
);
let snare1 = group_to_event_grid(
&flatten_group(group_or_delimited_group("(4-x)").unwrap().1).0.first().unwrap(),
&flatten_group(group_or_delimited_group("(4-x)").unwrap().1)
.0
.first()
.unwrap(),
SnareDrum,
&mut Tick(0),
);
@ -659,32 +720,27 @@ fn test_event_iterator_impl() {
/// Takes a mapping of drum parts and produce an `EventIterator` that return the next MIDI event.
/// Calling .collect() on this EventIterator should produce an `EventGrid`.
///
///
/// Returns time as a number of ticks from beginning, has to be turned into the midi delta-time.
fn merge_to_iterator(
fn merge_into_iterator(
groups: BTreeMap<Part, Groups>,
time_signature: TimeSignature,
) -> EventIterator {
println!("INPUT MAP: {:?}", groups);
// println!("INPUT MAP: {:?}", groups);
// Maps a drum part to a number of 128th notes
let length_map: BTreeMap<Part, u32> = groups
.iter()
.map(|(k, x)| (*k, x.to_128th()))
.collect();
println!("LENGTH MAP: {:?}", length_map);
println!("CONVERGING OVER {:?}", groups.values());
let length_map: BTreeMap<Part, u32> = groups.iter().map(|(k, x)| (*k, x.to_128th())).collect();
// We want exactly length_limit or BAR_LIMIT
let converges_over_bars = time_signature
.converges(groups.values())
.unwrap_or(BAR_LIMIT.clone());
if converges_over_bars == 1 {
println!("Converges over {} bar", converges_over_bars);
} else {
println!("Converges over {} bars", converges_over_bars);
}
// length limit in 128th notes
let length_limit = converges_over_bars * time_signature.to_128th();
println!("LENGTH LIMIT: {}", length_limit);
@ -697,7 +753,6 @@ fn merge_to_iterator(
let times = length_limit / length_128th;
println!("TIMES: {}", times);
let flattened = groups_to_event_grid(*part, groups);
println!("FLATTENED: {:?}", flattened);
(flattened, times)
}
None => (EventGrid::empty(), 0),
@ -709,7 +764,10 @@ fn merge_to_iterator(
let (hihat_grid, hihat_repeats) = flatten(&HiHat);
let (crash_grid, crash_repeats) = flatten(&CrashCymbal);
println!("CYCLED TO: {:?}", cycle_grid(kick_grid.clone(), Times(kick_repeats as u16)));
println!(
"CYCLED TO: {:?}",
cycle_grid(crash_grid.clone(), Times(crash_repeats as u16))
);
EventIterator::new(
cycle_grid(kick_grid, Times(kick_repeats as u16)),
@ -721,14 +779,14 @@ fn merge_to_iterator(
}
#[test]
fn test_merge_to_iterator() {
fn test_merge_into_iterator() {
let snare_group = "8-x--x-";
let kick_group = "16xx-x-xx-";
let kick_events = vec![Event { tick: Tick(0), event_type: NoteOn(KickDrum) }, Event { tick: Tick(12), event_type: NoteOff(KickDrum) }, Event { tick: Tick(12), event_type: NoteOn(KickDrum) }, Event { tick: Tick(24), event_type: NoteOff(KickDrum) }, Event { tick: Tick(36), event_type: NoteOn(KickDrum) }, Event { tick: Tick(48), event_type: NoteOff(KickDrum) }, Event { tick: Tick(60), event_type: NoteOn(KickDrum) }, Event { tick: Tick(72), event_type: NoteOff(KickDrum) }, Event { tick: Tick(72), event_type: NoteOn(KickDrum) }, Event { tick: Tick(84), event_type: NoteOff(KickDrum) }, Event { tick: Tick(96), event_type: NoteOn(KickDrum) }, Event { tick: Tick(108), event_type: NoteOff(KickDrum) }, Event { tick: Tick(108), event_type: NoteOn(KickDrum) }, Event { tick: Tick(120), event_type: NoteOff(KickDrum) }, Event { tick: Tick(132), event_type: NoteOn(KickDrum) }, Event { tick: Tick(144), event_type: NoteOff(KickDrum) }, Event { tick: Tick(156), event_type: NoteOn(KickDrum) }, Event { tick: Tick(168), event_type: NoteOff(KickDrum) }, Event { tick: Tick(168), event_type: NoteOn(KickDrum) }, Event { tick: Tick(180), event_type: NoteOff(KickDrum) }];
let snare_events = vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(24+144), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48+144), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96+144), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120+144), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(24+288), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48+288), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96+288), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120+288), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(24+144*3), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48+144*3), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96+144*3), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120+144*3), event_type: NoteOff(SnareDrum) }];
let snare_events = vec![Event { tick: Tick(24), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(24 + 144), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48 + 144), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96 + 144), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120 + 144), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(24 + 288), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48 + 288), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96 + 288), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120 + 288), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(24 + 144 * 3), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(48 + 144 * 3), event_type: NoteOff(SnareDrum) }, Event { tick: Tick(96 + 144 * 3), event_type: NoteOn(SnareDrum) }, Event { tick: Tick(120 + 144 * 3), event_type: NoteOff(SnareDrum) }];
let four_fourth = TimeSignature::from_str("4/4").unwrap();
let flattened_kick_and_snare = merge_to_iterator(
let flattened_kick_and_snare = merge_into_iterator(
BTreeMap::from_iter([
(KickDrum, groups("16xx-x-xx-").unwrap().1),
(SnareDrum, groups("8-x--x-").unwrap().1),
@ -737,25 +795,44 @@ fn test_merge_to_iterator() {
)
.collect::<Vec<Event<Tick>>>();
assert_eq!(merge_to_iterator(BTreeMap::from_iter([(KickDrum, groups(kick_group).unwrap().1)]), four_fourth).collect::<Vec<Event<Tick>>>(), kick_events);
assert_eq!(merge_to_iterator(BTreeMap::from_iter([(SnareDrum, groups(snare_group).unwrap().1)]), four_fourth).collect::<Vec<Event<Tick>>>(), snare_events);
assert_eq!(
merge_into_iterator(
BTreeMap::from_iter([(KickDrum, groups(kick_group).unwrap().1)]),
four_fourth
)
.collect::<Vec<Event<Tick>>>(),
kick_events
);
assert_eq!(
merge_into_iterator(
BTreeMap::from_iter([(SnareDrum, groups(snare_group).unwrap().1)]),
four_fourth
)
.collect::<Vec<Event<Tick>>>(),
snare_events
);
assert_eq!(
kick_events
.iter()
.all(|x| flattened_kick_and_snare.contains(x)) &&
snare_events
.iter()
.all(|x| flattened_kick_and_snare.contains(x)),
.all(|x| flattened_kick_and_snare.contains(x))
&& snare_events
.iter()
.all(|x| flattened_kick_and_snare.contains(x)),
true
);
}
// The length of a beat is not standard, so in order to fully describe the length of a MIDI tick the MetaMessage::Tempo event should be present.
pub fn create_smf<'a>(groups: BTreeMap<Part, Groups>, time_signature: TimeSignature, text: &'a str, tempo: u16) -> Smf<'a> {
pub fn create_smf<'a>(
groups: BTreeMap<Part, Groups>,
time_signature: TimeSignature,
text: &'a str,
tempo: u16,
) -> Smf<'a> {
let tracks = create_tracks(groups, time_signature, text, MidiTempo::from_tempo(tempo)); // FIXME
// https://majicdesigns.github.io/MD_MIDIFile/page_timing.html
// says " If it is not specified the MIDI default is 48 ticks per quarter note."
// As it's required in `Header`, let's use the same value.
// https://majicdesigns.github.io/MD_MIDIFile/page_timing.html
// says " If it is not specified the MIDI default is 48 ticks per quarter note."
// As it's required in `Header`, let's use the same value.
let metrical = midly::Timing::Metrical(TICKS_PER_QUARTER_NOTE.into());
Smf {
header: Header {
@ -767,36 +844,33 @@ pub fn create_smf<'a>(groups: BTreeMap<Part, Groups>, time_signature: TimeSignat
}
/// Translates drum parts to a single MIDI track.
///
///
/// /// # Arguments
///
/// * `parts_and_groups` - Drum parts parsed from the command line.
/// * `time_signature` - Time signature parsed from the command line.
/// * `text_event` - Text message to be embedded into the MIDI file.
///
///
/// # Returns
///
///
/// Multi-track vectors of MIDI events in `midly` format.
///
///
fn create_tracks<'a>(
parts_and_groups: BTreeMap<Part, Groups>,
time_signature: TimeSignature,
text_event: &'a str,
midi_tempo: MidiTempo
midi_tempo: MidiTempo,
) -> Vec<Vec<midly::TrackEvent<'a>>> {
let events_iter = merge_to_iterator(parts_and_groups, time_signature);
let events_iter = merge_into_iterator(parts_and_groups, time_signature);
let events: Vec<Event<Tick>> = events_iter.collect();
// Notice this time can be incorrect, but it shouldn't matter.
let time = match events.last() {
let track_time = match events.last() {
Some(ev) => ev.tick,
None => {
panic!("Result has no midi notes")
}
};
let event_grid_tick = EventGrid {
events,
length: time,
};
let event_grid_tick = EventGrid::new(events, track_time);
let event_grid = event_grid_tick.to_delta();
let mut drums = Vec::new();
@ -825,10 +899,12 @@ fn create_tracks<'a>(
kind: TrackEventKind::Meta(MetaMessage::MidiPort(10.into())),
});
drums.push(TrackEvent { delta: 0.into(), kind: TrackEventKind::Meta(MetaMessage::Tempo(midi_tempo.0)) });
drums.push(TrackEvent {
delta: 0.into(),
kind: TrackEventKind::Meta(MetaMessage::Tempo(midi_tempo.0)),
});
let (midi_time_signature_numerator, midi_time_signature_denominator) =
time_signature.to_midi();
let (midi_time_signature_numerator, midi_time_signature_denominator) = time_signature.to_midi();
drums.push(TrackEvent {
delta: 0.into(),
kind: TrackEventKind::Meta(MetaMessage::TimeSignature(
@ -838,8 +914,11 @@ fn create_tracks<'a>(
8,
)),
});
drums.push(TrackEvent { delta: 0.into(), kind: TrackEventKind::Meta(MetaMessage::Text(text_event.as_bytes())) });
drums.push(TrackEvent {
delta: 0.into(),
kind: TrackEventKind::Meta(MetaMessage::Text(text_event.as_bytes())),
});
for event in event_grid.events {
let midi_message = match event.event_type {