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Massive reworking of the EventIterator WIP

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This commit is contained in:
Denis Redozubov 2023-06-08 15:23:15 +04:00
parent 02bb26516e
commit 5ea3d27efc
3 changed files with 306 additions and 269 deletions
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2
src/bin/main.rs
View file

@ -46,7 +46,7 @@ fn part_to_string(part: Part) -> String {
}
}
fn validate_and_parse_part(cli: Option<String>, part: Part, patterns: &mut HashMap<Part, Vec<dsl::Group>>) -> () {
fn validate_and_parse_part(cli: Option<String>, part: Part, patterns: &mut HashMap<Part, dsl::Groups>) -> () {
match cli {
None => {},
Some(pattern) => {

114
src/dsl/dsl.rs
View file

@ -155,44 +155,6 @@ pub enum Note {
Rest
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[repr(transparent)]
pub struct Times(pub u16);
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum GroupOrNote {
SingleGroup(Group),
SingleNote(Note)
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Group {
pub notes: Vec<GroupOrNote>,
pub length: Length,
pub times: Times
}
impl KnownLength for Group {
fn to_128th(&self) -> u32 {
let mut acc = 0;
let note_length = self.length.to_128th();
for group in self.notes.iter() {
match group {
GroupOrNote::SingleGroup(subgroup) => { acc += subgroup.to_128th(); },
GroupOrNote::SingleNote(_) => { acc += note_length; },
}
};
acc * self.times.0 as u32
}
}
impl std::ops::Deref for Group {
type Target = Vec<GroupOrNote>;
fn deref(&self) -> &Self::Target {
&self.notes
}
}
#[allow(dead_code)]
pub static WHOLE : &Length = &Length::Simple(ModdedLength::Plain(BasicLength::Whole));
@ -251,6 +213,78 @@ pub static TWICE: &Times = &Times(2);
#[allow(dead_code)]
pub static THRICE : &Times = &Times(3);
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[repr(transparent)]
pub struct Times(pub u16);
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum GroupOrNote {
SingleGroup(Group),
SingleNote(Note)
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Group {
pub notes: Vec<GroupOrNote>,
pub length: Length,
pub times: Times
}
impl Group {
pub fn empty() -> Self {
Group { notes: Vec::new(), length: FOURTH.clone(), times: Times(1) }
}
}
impl KnownLength for &Group {
fn to_128th(&self) -> u32 {
let mut acc = 0;
let note_length = self.length.to_128th();
for group in self.notes.iter() {
match group {
GroupOrNote::SingleGroup(subgroup) => { acc += subgroup.to_128th(); },
GroupOrNote::SingleNote(_) => { acc += note_length; },
}
};
acc * self.times.0 as u32
}
}
impl KnownLength for Group {
fn to_128th(&self) -> u32 {
let mut acc = 0;
let note_length = self.length.to_128th();
for group in self.notes.iter() {
match group {
GroupOrNote::SingleGroup(subgroup) => { acc += subgroup.to_128th(); },
GroupOrNote::SingleNote(_) => { acc += note_length; },
}
};
acc * self.times.0 as u32
}
}
impl std::ops::Deref for Group {
type Target = Vec<GroupOrNote>;
fn deref(&self) -> &Self::Target {
&self.notes
}
}
pub struct Groups(pub Vec<Group>);
impl KnownLength for Groups {
fn to_128th(&self) -> u32 {
self.0.iter().fold(0, |acc, x| { acc + x.to_128th() })
}
}
impl KnownLength for &Groups {
fn to_128th(&self) -> u32 {
self.0.iter().fold(0, |acc, x| { acc + x.to_128th() })
}
}
fn hit(input: &str) -> IResult<&str, Note> {
map(char('x'), |_| { Note::Hit })(input)
@ -319,8 +353,8 @@ pub fn group_or_delimited_group(input: &str) -> IResult<&str, Group> {
alt((delimited_group, group))(input)
}
pub fn groups(input: &str) -> IResult<&str, Vec<Group>> {
many1(group_or_delimited_group)(input)
pub fn groups(input: &str) -> IResult<&str, Groups> {
many1(group_or_delimited_group)(input).map(|x| { (x.0, Groups(x.1)) } )
}
#[test]

459
src/midi/core.rs
View file

@ -1,10 +1,12 @@
extern crate derive_more;
use std::cmp::Ordering;
use std::collections::HashMap;
use std::iter::Cycle;
use std::collections::{BTreeMap, HashMap};
use std::iter::Peekable;
use std::iter::{Cycle, Take};
use std::ops::{Add, Mul};
use std::str::FromStr;
use std::path::Iter;
use std::time;
use midly::{
num::u15, num::u24, num::u28, num::u4, num::u7, Header, MidiMessage, Smf, Track, TrackEventKind,
@ -12,16 +14,38 @@ use midly::{
use midly::{EventIter, MetaMessage, TrackEvent};
use crate::dsl::dsl::{
group_or_delimited_group, groups, BasicLength, Group, GroupOrNote, Length, ModdedLength, Note,
Times,
group_or_delimited_group, groups, BasicLength, Group, GroupOrNote, Groups, KnownLength, Length,
ModdedLength, Note, Times,
};
use crate::midi::time::{TimeSignature};
use crate::midi::time::TimeSignature;
#[allow(dead_code)]
static BAR_LIMIT: u32 = 1000;
// Typically used as number of ticks since the beginning of the track.
#[derive(Debug, Clone, Copy, PartialEq,Eq,PartialOrd,Ord,derive_more::Add, derive_more::Sub, derive_more::Mul, derive_more::Rem,derive_more::Display)]
#[derive(
Debug,
Clone,
Copy,
PartialEq,
Eq,
PartialOrd,
Ord,
derive_more::Add,
derive_more::Sub,
derive_more::Mul,
derive_more::Rem,
derive_more::Display,
)]
#[repr(transparent)]
pub struct Tick(pub u128);
impl Tick {
pub fn from_128th(t: u32) -> Self {
Tick(TICKS_PER_64TH_NOTE as u128 * t as u128)
}
}
#[test]
fn test_add_tick() {
assert_eq!(Tick(2) + Tick(2), Tick(4));
@ -46,7 +70,7 @@ impl Ord for EventType {
(EventType::NoteOn(a), EventType::NoteOn(b)) => a.cmp(b),
(EventType::NoteOn(_), EventType::NoteOff(_)) => Ordering::Greater,
(EventType::NoteOff(_), EventType::NoteOn(_)) => Ordering::Less,
(EventType::NoteOff(a), EventType::NoteOff(b)) => a.cmp(b)
(EventType::NoteOff(a), EventType::NoteOff(b)) => a.cmp(b),
}
}
}
@ -86,9 +110,9 @@ pub struct Event<T> {
event_type: EventType,
}
impl <T> Ord for Event<T>
impl<T> Ord for Event<T>
where
T: Ord
T: Ord,
{
fn cmp(&self, other: &Event<T>) -> Ordering {
if self.tick == other.tick {
@ -101,14 +125,23 @@ where
#[test]
fn test_ord_event_t() {
let first_on = Event{ tick: Tick(0), event_type: EventType::NoteOn(Part::KickDrum)};
let first_off = Event{ tick: Tick(24), event_type: EventType::NoteOff(Part::KickDrum)};
let second_on = Event{ tick: Tick(24), event_type: EventType::NoteOn(Part::KickDrum)};
let first_on = Event {
tick: Tick(0),
event_type: EventType::NoteOn(Part::KickDrum),
};
let first_off = Event {
tick: Tick(24),
event_type: EventType::NoteOff(Part::KickDrum),
};
let second_on = Event {
tick: Tick(24),
event_type: EventType::NoteOn(Part::KickDrum),
};
assert_eq!(first_on.cmp(&first_off), Ordering::Less);
assert_eq!(first_off.cmp(&second_on), Ordering::Less);
let mut vec1 = vec![second_on, first_off, first_on];
vec1.sort_by(|x,y| {x.cmp(y)});
vec1.sort_by(|x, y| x.cmp(y));
assert_eq!(vec1, vec![first_on, first_off, second_on]);
}
@ -148,7 +181,7 @@ impl<T: Add<Tick, Output = T> + Clone + Ord + std::fmt::Debug> Add for EventGrid
.collect();
self.events.extend(other_events);
// I don't know why sort() doesn't work in the same way.
self.events.sort_by(|x,y| { x.cmp(y) });
self.events.sort_by(|x, y| x.cmp(y));
println!("self.events: {:?}", self.events);
self.length = self.length + other.length;
self
@ -223,7 +256,7 @@ fn test_arith_event_grids() {
#[test]
fn test_add_event_grid() {
let mut empty: EventGrid<Tick> = EventGrid::new();
let empty: EventGrid<Tick> = EventGrid::empty();
let kick_on = Event {
tick: Tick(0),
event_type: EventType::NoteOn(Part::KickDrum),
@ -266,7 +299,7 @@ fn test_add_event_grid() {
}
impl<T> EventGrid<T> {
fn new() -> Self {
fn empty() -> Self {
EventGrid {
events: Vec::new(),
length: Tick(0),
@ -278,7 +311,7 @@ impl EventGrid<Tick> {
/// Converts a single-track(!!!!) sorted `EventGrid<Tick>`
fn to_delta(&self) -> EventGrid<Delta> {
let mut time = Tick(0);
let mut delta_grid = EventGrid::new();
let mut delta_grid = EventGrid::empty();
for e in &self.events {
let delta = e.tick - time;
time = time + delta;
@ -294,6 +327,9 @@ impl EventGrid<Tick> {
#[allow(dead_code)]
static TICKS_PER_QUARTER_NOTE: u16 = 48;
#[allow(dead_code)]
static TICKS_PER_64TH_NOTE: u16 = TICKS_PER_QUARTER_NOTE / 16;
impl BasicLength {
/// `BasicLength` to MIDI Ticks
pub fn to_ticks(&self) -> Tick {
@ -307,19 +343,6 @@ impl BasicLength {
BasicLength::SixtyFourth => Tick((TICKS_PER_QUARTER_NOTE / 16) as u128),
}
}
pub fn to_note_length(&self) -> u8 {
match self {
BasicLength::Whole => 1,
BasicLength::Half => 2,
BasicLength::Fourth => 4,
BasicLength::Eighth => 8,
BasicLength::Sixteenth => 16,
BasicLength::ThirtySecond => 32,
BasicLength::SixtyFourth => 64,
}
}
}
impl ModdedLength {
@ -407,7 +430,7 @@ fn flatten_group(
) -> EventGrid<Tick> {
let time = start;
let note_length = length.to_ticks();
let mut grid = EventGrid::new();
let mut grid = EventGrid::empty();
notes.iter().for_each(|entry| {
match entry {
crate::dsl::dsl::GroupOrNote::SingleGroup(group) => {
@ -438,7 +461,7 @@ fn flatten_group(
};
});
// grid.events.sort() is not the same for some reason
grid.events.sort_by(|x,y| { x.cmp(y) });
grid.events.sort_by(|x, y| x.cmp(y));
cycle_grid(grid, *times)
}
@ -475,7 +498,7 @@ fn test_flatten_group() {
}
fn cycle_grid(event_grid: EventGrid<Tick>, times: Times) -> EventGrid<Tick> {
let mut grid = EventGrid::new();
let mut grid = EventGrid::empty();
for _ in 1..(times.0 + 1) {
grid = grid + event_grid.clone();
}
@ -484,8 +507,8 @@ fn cycle_grid(event_grid: EventGrid<Tick>, times: Times) -> EventGrid<Tick> {
#[test]
fn test_cycle_grid() {
let empty: EventGrid<Tick> = EventGrid::new();
assert_eq!(cycle_grid(EventGrid::new(), Times(2)), empty);
let empty: EventGrid<Tick> = EventGrid::empty();
assert_eq!(cycle_grid(EventGrid::empty(), Times(2)), empty);
let kick_on = Event {
tick: Tick(0),
event_type: EventType::NoteOn(Part::KickDrum),
@ -526,26 +549,21 @@ fn test_cycle_grid() {
);
}
fn flatten_groups(part: Part, groups: &Vec<Group>) -> EventGrid<Tick> {
fn flatten_groups(part: Part, groups: &Groups) -> EventGrid<Tick> {
let mut time: Tick = Tick(0);
let mut grid: EventGrid<Tick> = EventGrid::new();
groups.iter().for_each(|group| {
let mut grid: EventGrid<Tick> = EventGrid::empty();
groups.0.iter().for_each(|group| {
grid = grid.clone() + flatten_group(group, part, &mut time);
});
grid
}
pub struct EventIterator {
kick: Peekable<Cycle<std::vec::IntoIter<Event<Tick>>>>,
snare: Peekable<Cycle<std::vec::IntoIter<Event<Tick>>>>,
hihat: Peekable<Cycle<std::vec::IntoIter<Event<Tick>>>>,
crash: Peekable<Cycle<std::vec::IntoIter<Event<Tick>>>>,
kick_length: Tick,
snare_length: Tick,
hihat_length: Tick,
crash_length: Tick,
limit: Tick,
time: Tick,
kick: Peekable<std::vec::IntoIter<Event<Tick>>>,
snare: Peekable<std::vec::IntoIter<Event<Tick>>>,
hihat: Peekable<std::vec::IntoIter<Event<Tick>>>,
crash: Peekable<std::vec::IntoIter<Event<Tick>>>,
time_signature: TimeSignature,
}
impl EventIterator {
@ -554,157 +572,60 @@ impl EventIterator {
snare_grid: EventGrid<Tick>,
hihat_grid: EventGrid<Tick>,
crash_grid: EventGrid<Tick>,
limit_value: Tick,
time_signature: TimeSignature,
) -> EventIterator {
let kick_repeats = 1;
let snare_repeats = 1;
let hihat_repeats = 1;
let crash_repeats = 1;
let event_iterator = EventIterator {
kick_length: kick_grid.length.clone(),
snare_length: snare_grid.length.clone(),
hihat_length: hihat_grid.length.clone(),
crash_length: crash_grid.length.clone(),
kick: kick_grid.into_iter().cycle().peekable(),
snare: snare_grid.into_iter().cycle().peekable(),
hihat: hihat_grid.into_iter().cycle().peekable(),
crash: crash_grid.into_iter().cycle().peekable(),
limit: limit_value,
time: Tick(0),
kick: kick_grid.into_iter().peekable(),
snare: snare_grid.into_iter().peekable(),
hihat: hihat_grid.into_iter().peekable(),
crash: crash_grid.into_iter().peekable(),
time_signature,
};
event_iterator
}
}
impl Iterator for EventIterator {
type Item = (Event<Tick>, Tick);
type Item = Event<Tick>;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
println!("============");
println!("self.time: {}", self.time);
println!("self.kick: {:?}", self.kick.peek());
let mut min_part = Part::KickDrum;
let mut min_tick = self.limit;
let mut min_event: Event<Tick> = Event {
tick: Tick(0),
event_type: EventType::NoteOn(Part::KickDrum),
};
let candidates = vec![
(self.kick.peek(), Part::KickDrum),
(self.snare.peek(), Part::SnareDrum),
(self.hihat.peek(), Part::HiHat),
(self.crash.peek(), Part::CrashCymbal),
];
let candidates: BTreeMap<Part, Event<Tick>> = [
(Part::KickDrum, self.kick.peek()),
(Part::SnareDrum, self.snare.peek()),
(Part::HiHat, self.hihat.peek()),
(Part::CrashCymbal, self.crash.peek()),
]
.into_iter()
.filter_map(|(p, x)| match x {
Some(x) => Some((p, *x)),
None => None,
})
.collect();
println!("candidates: {:?}", candidates);
for (o, p) in candidates {
match o {
Some(e) => {
println!("{:?}", e);
if e.tick == self.time {
println!("e.tick = self.time");
min_part = p;
min_tick = e.tick;
min_event = *e;
continue;
} else if e.tick <= min_tick {
println!("e.tick <= min_tick");
min_part = p;
min_tick = e.tick;
min_event = *e;
} else {
println!("continue");
continue;
}
}
None => continue,
}
}
println!("<<< min_event: {:?}", min_event);
let mut group_length: Tick;
match min_part {
Part::KickDrum => {
println!("Kick");
self.kick.next();
group_length = self.kick_length;
}
Part::SnareDrum => {
println!("Snare");
self.snare.next();
group_length = self.snare_length;
}
Part::HiHat => {
self.hihat.next();
group_length = self.hihat_length;
}
Part::CrashCymbal => {
self.crash.next();
group_length = self.crash_length;
}
};
println!("group_length: {}", group_length);
self.time = match self.time.cmp(&group_length) {
Ordering::Less => {
println!("self.time < group_length");
if min_event.tick == self.time {
println!(
"min_event.tick ({}) = self.time ({})",
min_event.tick, self.time
);
self.time + min_event.tick
} else {
println!(
"min_event.tick ({}) <> self.time ({})",
min_event.tick, self.time
);
Tick(self.time.0 + (self.time.0 % group_length.0) + min_event.tick.0)
}
}
Ordering::Equal => {
println!("self.time = group_length ({})", self.time);
if self.time == min_event.tick {
self.time
} else {
self.time + min_event.tick
}
}
Ordering::Greater => {
println!("self.time ({}) > group_length ({})", self.time, group_length);
Tick(self.time.0 + (group_length.0 % self.time.0) + min_event.tick.0)
}
};
println!("updated self.time: {}", self.time);
match self.time.cmp(&self.limit) {
Ordering::Less => {
println!("self.time < self.limit");
min_event.tick = self.time;
Some((min_event, self.time))
}
Ordering::Equal => {
println!("self.time = self.limit");
if min_event.event_type.is_note_on() {
None
} else {
min_event.tick = self.time;
Some((min_event, self.time))
}
}
Ordering::Greater => {
println!("self.time > self.limit");
None
}
}
if let Some((min_part, min_event)) = candidates.iter().min_by_key(|(_,x)| *x) {
match min_part {
Part::KickDrum => self.kick.next(),
Part::SnareDrum => self.snare.next(),
Part::HiHat => self.hihat.next(),
Part::CrashCymbal => self.crash.next(),
};
Some(*min_event)
} else {
None
}
}
}
#[test]
fn test_event_iterator_impl() {
let empty = EventGrid::new();
let empty = EventGrid::empty();
let kick1 = flatten_group(
&group_or_delimited_group("(4x-)").unwrap().1,
Part::KickDrum,
@ -732,22 +653,51 @@ fn test_event_iterator_impl() {
snare2.clone(),
empty.clone(),
empty.clone(),
Tick(96)
TimeSignature::from_str("4/4").unwrap()
)
.into_iter()
.map(|x| { x.0 })
.collect::<Vec<Event<Tick>>>(),
vec![
Event { event_type: EventType::NoteOn(Part::KickDrum), tick: Tick(0) },
Event { event_type: EventType::NoteOff(Part::KickDrum), tick: Tick(24) },
Event { event_type: EventType::NoteOn(Part::KickDrum), tick: Tick(24) },
Event { event_type: EventType::NoteOff(Part::KickDrum), tick: Tick(48) },
Event { event_type: EventType::NoteOn(Part::SnareDrum), tick: Tick(48) },
Event { event_type: EventType::NoteOn(Part::KickDrum), tick: Tick(48) },
Event { event_type: EventType::NoteOff(Part::KickDrum), tick: Tick(72) },
Event { event_type: EventType::NoteOn(Part::KickDrum), tick: Tick(72) },
Event { event_type: EventType::NoteOff(Part::KickDrum), tick: Tick(96) },
Event { event_type: EventType::NoteOn(Part::SnareDrum), tick: Tick(96) }
Event {
event_type: EventType::NoteOn(Part::KickDrum),
tick: Tick(0)
},
Event {
event_type: EventType::NoteOff(Part::KickDrum),
tick: Tick(24)
},
Event {
event_type: EventType::NoteOn(Part::KickDrum),
tick: Tick(24)
},
Event {
event_type: EventType::NoteOff(Part::KickDrum),
tick: Tick(48)
},
Event {
event_type: EventType::NoteOn(Part::SnareDrum),
tick: Tick(48)
},
Event {
event_type: EventType::NoteOn(Part::KickDrum),
tick: Tick(48)
},
Event {
event_type: EventType::NoteOff(Part::KickDrum),
tick: Tick(72)
},
Event {
event_type: EventType::NoteOn(Part::KickDrum),
tick: Tick(72)
},
Event {
event_type: EventType::NoteOff(Part::KickDrum),
tick: Tick(96)
},
Event {
event_type: EventType::NoteOn(Part::SnareDrum),
tick: Tick(96)
}
]
);
@ -757,10 +707,9 @@ fn test_event_iterator_impl() {
snare1.clone(),
empty.clone(),
empty.clone(),
Tick(96)
TimeSignature::from_str("4/4").unwrap()
)
.into_iter()
.map(|x| { x.0 })
.collect::<Vec<Event<Tick>>>(),
vec![
Event {
@ -788,10 +737,9 @@ fn test_event_iterator_impl() {
empty.clone(),
empty.clone(),
empty.clone(),
Tick(96)
TimeSignature::from_str("4/4").unwrap()
)
.into_iter()
.map(|x| { x.0 })
.collect::<Vec<Event<Tick>>>(),
[
Event {
@ -810,10 +758,9 @@ fn test_event_iterator_impl() {
empty.clone(),
empty.clone(),
empty.clone(),
Tick(144)
TimeSignature::from_str("4/4").unwrap()
)
.into_iter()
.map(|x| { x.0 })
.collect::<Vec<Event<Tick>>>(),
[
Event {
@ -838,28 +785,89 @@ fn test_event_iterator_impl() {
// Returns time as a number of ticks from beginning, has to be turned into the midi delta-time.
fn flatten_and_merge(
mut groups: HashMap<Part, Vec<Group>>,
groups: HashMap<Part, Groups>,
time_signature: TimeSignature,
) -> EventIterator {
let f = |p| {
groups
.get(&p)
.map(|g| flatten_groups(p, g))
.unwrap_or(EventGrid::new())
let length_map: HashMap<Part, u32> = groups
.iter()
.map(|(k, x)| (*k, x.0.iter().fold(0, |acc, n| acc + n.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());
let length_limit = converges_over_bars * time_signature.to_128th();
let (kick_grid, kick_repeats) = match groups.get(&Part::KickDrum) {
Some(groups) => {
let length_128th = length_map.get(&Part::KickDrum).unwrap();
let number_of_groups = groups.0.len();
let times = length_limit / length_128th;
// let iterator = flatten_groups(Part::KickDrum, groups).into_iter().cycle().take(number_of_groups * times as usize).peekable()
(
flatten_groups(Part::KickDrum, groups),
number_of_groups * times as usize,
)
}
None => (EventGrid::empty(), 0),
};
let kick = f(Part::KickDrum);
let snare = f(Part::SnareDrum);
let hihat = f(Part::HiHat);
let crash = f(Part::CrashCymbal);
EventIterator::new(kick, snare, hihat, crash, Tick(1000000))
let (snare_grid, snare_repeats) = match groups.get(&Part::SnareDrum) {
Some(groups) => {
let length_128th = length_map.get(&Part::SnareDrum).unwrap();
let number_of_groups = groups.0.len();
let times = length_limit / length_128th;
(
flatten_groups(Part::SnareDrum, groups),
number_of_groups * times as usize,
)
}
None => (EventGrid::empty(), 0),
};
let (hihat_grid, hihat_repeats) = match groups.get(&Part::HiHat) {
Some(groups) => {
let length_128th = length_map.get(&Part::HiHat).unwrap();
let number_of_groups = groups.0.len();
let times = length_limit / length_128th;
(
flatten_groups(Part::HiHat, groups),
number_of_groups * times as usize,
)
}
None => (EventGrid::empty(), 0),
};
let (crash_grid, crash_repeats) = match groups.get(&Part::CrashCymbal) {
Some(groups) => {
let length_128th = length_map.get(&Part::CrashCymbal).unwrap();
let number_of_groups = groups.0.len();
let times = length_limit / length_128th;
(
flatten_groups(Part::CrashCymbal, groups),
number_of_groups * times as usize,
)
}
None => (EventGrid::empty(), 0),
};
// let iter = |grid: EventGrid<Tick>, times| grid.into_iter().cycle().take(times).peekable();
let iter = |grid: EventGrid<Tick>, times| {
[0..times]
.iter()
.fold(EventGrid::empty(), |acc, _| acc + grid.clone())
};
EventIterator::new(
iter(kick_grid, kick_repeats),
iter(snare_grid, snare_repeats),
iter(hihat_grid, hihat_repeats),
iter(crash_grid, crash_repeats),
time_signature,
)
}
// 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: HashMap<Part, Vec<Group>>, time_signature: TimeSignature) -> Smf<'a> {
pub fn create_smf<'a>(groups: HashMap<Part, Groups>, time_signature: TimeSignature) -> Smf<'a> {
let tracks = create_tracks(groups, time_signature); // 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(u15::new(TICKS_PER_QUARTER_NOTE));
Smf {
header: Header {
@ -872,28 +880,23 @@ pub fn create_smf<'a>(groups: HashMap<Part, Vec<Group>>, time_signature: TimeSig
/// Translates drum parts to a single MIDI track.
fn create_tracks<'a>(
parts_and_groups: HashMap<Part, Vec<Group>>,
time_signature: TimeSignature, // tempo: u32
parts_and_groups: HashMap<Part, Groups>,
time_signature: TimeSignature,
// tempo: u32
) -> Vec<Vec<midly::TrackEvent<'a>>> {
//FIXME: unhardcode time signature
let events_iter = flatten_and_merge(
parts_and_groups,
TimeSignature {
numerator: 4,
denominator: BasicLength::Fourth,
},
);
let event_pairs: Vec<(Event<Tick>, Tick)> = events_iter.collect();
let events = event_pairs.iter().map(|x| x.0).collect();
let time = match event_pairs.last() {
Some((_, time)) => time,
let events_iter = flatten_and_merge(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() {
Some(ev) => ev.tick,
None => {
panic!("Result has no midi notes")
}
};
let event_grid_tick = EventGrid {
events,
length: *time,
length: time,
};
println!("event grid in ticks: {:?}", event_grid_tick);
let event_grid = event_grid_tick.to_delta();