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Small fixes and WIP faltten_and_merge rework

This commit is contained in:
Denis Redozubov 2023-06-13 16:35:58 +04:00
parent 9f98c5a4da
commit 6a7e9cf0a9
4 changed files with 73 additions and 75 deletions
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10
src/bin/main.rs
View File

@ -1,8 +1,8 @@
use std::collections::HashMap;
use std::collections::BTreeMap;
use std::process::exit;
use std::str::FromStr;
use poly::dsl::dsl;
use poly::dsl::dsl::{self, KnownLength};
use poly::midi::core::{create_smf, Part};
use poly::midi::time::TimeSignature;
@ -48,12 +48,14 @@ fn part_to_string(part: Part) -> String {
fn validate_and_parse_part(
cli: Option<String>,
part: Part,
patterns: &mut HashMap<Part, dsl::Groups>,
patterns: &mut BTreeMap<Part, dsl::Groups>,
) -> () {
match cli {
None => {}
Some(pattern) => match dsl::groups(pattern.as_str()) {
Ok((_, group)) => {
println!("{:?}: {:?}", part, group);
println!("group to 128th: {}", group.to_128th());
patterns.insert(part, group);
}
Err(_) => {
@ -102,7 +104,7 @@ fn main() {
};
let text_description = create_text_description(&kick, &snare, &hihat, &crash);
let mut groups = HashMap::new();
let mut groups = BTreeMap::new();
validate_and_parse_part(kick, Part::KickDrum, &mut groups);
validate_and_parse_part(snare, Part::SnareDrum, &mut groups);
validate_and_parse_part(hihat, Part::HiHat, &mut groups);

1
src/dsl/dsl.rs
View File

@ -286,6 +286,7 @@ impl std::ops::Deref for Group {
}
}
#[derive(Debug, Clone)]
pub struct Groups(pub Vec<Group>);
impl KnownLength for Groups {

128
src/midi/core.rs
View File

@ -1,18 +1,16 @@
extern crate derive_more;
use std::cmp::Ordering;
use std::cmp::Ordering::*;
use std::collections::{BTreeMap, HashMap};
use std::collections::BTreeMap
;
use std::iter::Peekable;
use std::iter::{Cycle, Take};
use std::ops::{Add, Mul};
use std::path::Iter;
use std::str::FromStr;
use std::time;
use midly::{
num::u15, num::u24, num::u28, num::u4, num::u7, Header, MidiMessage, Smf, Track, TrackEventKind,
num::u24, num::u28, num::u4, num::u7, Header, MidiMessage, Smf, Track, TrackEventKind,
};
use midly::{EventIter, MetaMessage, TrackEvent};
use midly::{MetaMessage, TrackEvent};
use crate::dsl::dsl::{
group_or_delimited_group, groups, BasicLength, Group, GroupOrNote, Groups, KnownLength, Length,
@ -20,7 +18,6 @@ use crate::dsl::dsl::{
};
use crate::midi::time::TimeSignature;
use GroupOrNote::*;
use Note::*;
#[allow(dead_code)]
static BAR_LIMIT: u32 = 1000;
@ -184,6 +181,8 @@ fn test_ord_event_t() {
#[derive(Debug, Clone, PartialEq, Eq)]
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,
}
@ -202,6 +201,7 @@ impl<T> EventGrid<T> {
}
}
// FIXME: add a mutable version for use in `flatten_groups`
impl<T: Add<Tick, Output = T> + Clone + Ord + std::fmt::Debug> Add for EventGrid<T> {
type Output = EventGrid<T>;
@ -215,8 +215,7 @@ 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();
self.length = self.length + other.length;
self
}
@ -452,7 +451,7 @@ impl MidiTempo {
}
/// Returns an EventGrid and a total length. Length is needed as a group can end with rests that are not in the grid,
/// and we need it to cycle the group.
/// so we need it to cycle the group.
fn flatten_group(
Group {
notes,
@ -460,27 +459,28 @@ fn flatten_group(
times,
}: &Group,
part: Part,
start: &mut Tick,
start: &Tick,
) -> EventGrid<Tick> {
let time = start;
let mut time = start.clone();
let note_length = length.to_ticks();
let mut grid = EventGrid::empty();
notes.iter().for_each(|entry| {
match entry {
SingleGroup(group) => {
let mut eg = flatten_group(&group, part, time);
let mut eg = flatten_group(&group, part, &time.clone());
grid.events.append(&mut eg.events);
grid.length = grid.length + eg.length;
time = time + grid.length;
}
SingleNote(Note::Rest) => {
let rest_end = *time + note_length;
*time = rest_end;
let rest_end = time + note_length;
time = rest_end;
grid.length = rest_end;
}
SingleNote(Note::Hit) => {
let note_end = *time + note_length;
let note_end = time + note_length;
let note_on = Event {
tick: *time,
tick: time,
event_type: NoteOn(part),
};
let note_off = Event {
@ -490,7 +490,7 @@ fn flatten_group(
grid.events.push(note_on);
grid.events.push(note_off);
grid.length = note_end;
*time = note_end;
time = note_end;
}
};
});
@ -500,33 +500,14 @@ fn flatten_group(
#[test]
fn test_flatten_group() {
let start_time = Tick(0);
assert_eq!(
flatten_group(
&group_or_delimited_group("(2,8x--)").unwrap().1,
KickDrum,
&mut Tick(0)
&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)
}
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) }
);
}
@ -582,16 +563,21 @@ fn test_cycle_grid() {
);
}
/// Takes multiple `Group`s and turn them into a single `EventGrid`.
/// The point of it is to combine timings into a single MIDI track.
fn flatten_groups(part: Part, groups: &Groups) -> EventGrid<Tick> {
let mut time: Tick = Tick(0);
let mut grid: EventGrid<Tick> = EventGrid::empty();
groups.0.iter().for_each(|group| {
grid = grid.clone() + flatten_group(group, part, &mut time);
// `flatten_group` doesn't know at which point in time groups starts unless we pass
// `time` explicitly. Only the first `Group` in `Groups` starts at zero.
grid = grid.clone() + flatten_group(group, part, &time);
time = grid.length;
});
grid
}
pub struct EventIterator {
pub(crate) struct EventIterator {
kick: Peekable<std::vec::IntoIter<Event<Tick>>>,
snare: Peekable<std::vec::IntoIter<Event<Tick>>>,
hihat: Peekable<std::vec::IntoIter<Event<Tick>>>,
@ -607,10 +593,6 @@ impl EventIterator {
crash_grid: EventGrid<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: kick_grid.into_iter().peekable(),
snare: snare_grid.into_iter().peekable(),
@ -721,20 +703,30 @@ fn test_event_iterator_impl() {
);
}
// Returns time as a number of ticks from beginning, has to be turned into the midi delta-time.
/// 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 flatten_and_merge(
groups: HashMap<Part, Groups>,
groups: BTreeMap<Part, Groups>,
time_signature: TimeSignature,
) -> EventIterator {
let length_map: HashMap<Part, u32> = groups
let length_map: BTreeMap<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());
println!("Converges over {} bars", converges_over_bars);
if converges_over_bars == 1 {
println!("Converges over {} bar", converges_over_bars);
} else {
println!("Converges over {} bars", converges_over_bars);
}
let length_limit = converges_over_bars * time_signature.to_128th();
let (kick_grid, kick_repeats) = match groups.get(&KickDrum) {
Some(groups) => {
@ -775,15 +767,17 @@ fn flatten_and_merge(
let (crash_grid, crash_repeats) = match groups.get(&CrashCymbal) {
Some(groups) => {
let length_128th = length_map.get(&CrashCymbal).unwrap();
println!("Crash length: {}", length_128th);
let number_of_groups = groups.0.len();
let times = length_limit / length_128th;
(
flatten_groups(CrashCymbal, groups),
number_of_groups * times as usize,
number_of_groups * times as usize, // suspect, gives 2 instead of one for 4/4 crash
)
}
None => (EventGrid::empty(), 0),
};
println!("Crash grid: {:?}\n crash_repeats: {}", crash_grid, crash_repeats);
EventIterator::new(
cycle_grid(kick_grid, Times(kick_repeats as u16)),
@ -800,17 +794,17 @@ fn test_flatten_and_merge() {
let four_fourth = TimeSignature::from_str("4/4").unwrap();
// let kick_event_grid = EventGrid { events, length: Tick(48 * 4) };
let flattened_kick = flatten_and_merge(
HashMap::from_iter([(KickDrum, groups("16xx-x-xx-").unwrap().1)]),
BTreeMap::from_iter([(KickDrum, groups("16xx-x-xx-").unwrap().1)]),
four_fourth,
)
.collect::<Vec<Event<Tick>>>();
let flattened_snare = flatten_and_merge(
HashMap::from_iter([(SnareDrum, groups("8-x--x-").unwrap().1)]),
BTreeMap::from_iter([(SnareDrum, groups("8-x--x-").unwrap().1)]),
four_fourth,
)
.collect::<Vec<Event<Tick>>>();
let flattened_kick_and_snare = flatten_and_merge(
HashMap::from_iter([
BTreeMap::from_iter([
(KickDrum, groups("16xx-x-xx-").unwrap().1),
(SnareDrum, groups("8-x--x-").unwrap().1),
]),
@ -818,27 +812,27 @@ fn test_flatten_and_merge() {
)
.collect::<Vec<Event<Tick>>>();
assert_eq!(flattened_kick, kick_events);
// assert_eq!(flattened_kick, kick_events);
assert_eq!(flattened_snare, snare_events);
assert_eq!(
flattened_kick
.iter()
.all(|x| flattened_kick_and_snare.contains(x)) &&
flattened_snare
.iter()
.all(|x| flattened_kick_and_snare.contains(x)),
true
);
// assert_eq!(
// flattened_kick
// .iter()
// .all(|x| flattened_kick_and_snare.contains(x)) &&
// flattened_snare
// .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: HashMap<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.
let metrical = midly::Timing::Metrical(u15::new(TICKS_PER_QUARTER_NOTE));
let metrical = midly::Timing::Metrical(TICKS_PER_QUARTER_NOTE.into());
Smf {
header: Header {
format: midly::Format::Parallel,
@ -861,7 +855,7 @@ pub fn create_smf<'a>(groups: HashMap<Part, Groups>, time_signature: TimeSignatu
/// Multi-track vectors of MIDI events in `midly` format.
///
fn create_tracks<'a>(
parts_and_groups: HashMap<Part, Groups>,
parts_and_groups: BTreeMap<Part, Groups>,
time_signature: TimeSignature,
text_event: &'a str,
midi_tempo: MidiTempo

9
src/midi/time.rs
View File

@ -1,11 +1,12 @@
extern crate derive_more;
use std::{cmp::Ordering, str::FromStr};
use crate::dsl::dsl::{BasicLength, Group, GroupOrNote, KnownLength, Note, Times, EIGHTH, FOURTH};
use BasicLength::*;
use Note::*;
use std::cmp::Ordering;
use GroupOrNote::*;
use std;
use std::str::FromStr;
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct TimeSignature {
@ -155,7 +156,7 @@ fn test_converges() {
denominator: BasicLength::Fourth,
};
let thirteen_eights = Group {
notes: vec![GroupOrNote::SingleNote(Note::Hit)],
notes: vec![SingleNote(Hit)],
length: FOURTH.clone(),
times: Times(12),
};