Cli logic and midi event flattening

This commit is contained in:
Denis Redozubov 2023-05-08 20:26:25 +04:00
parent 8f84491801
commit f1dfb31b70
7 changed files with 510 additions and 79 deletions

285
Cargo.lock generated
View file

@ -2,18 +2,127 @@
# It is not intended for manual editing.
version = 3
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"anstyle-parse",
"anstyle-query",
"anstyle-wincon",
"colorchoice",
"is-terminal",
"utf8parse",
]
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]
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"clap_lex",
"strsim",
]
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dependencies = [
"heck",
"proc-macro2",
"quote",
"syn 2.0.15",
]
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[[package]]
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@ -73,7 +182,7 @@ dependencies = [
"proc-macro2",
"quote",
"rustc_version",
"syn",
"syn 1.0.109",
]
[[package]]
@ -82,6 +191,33 @@ version = "1.8.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"errno-dragonfly",
"libc",
"windows-sys",
]
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name = "errno-dragonfly"
version = "0.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"cc",
"libc",
]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "hermit-abi"
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@ -91,12 +227,47 @@ dependencies = [
"libc",
]
[[package]]
name = "hermit-abi"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286"
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dependencies = [
"hermit-abi 0.3.1",
"libc",
"windows-sys",
]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"hermit-abi 0.3.1",
"io-lifetimes",
"rustix",
"windows-sys",
]
[[package]]
name = "libc"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "memchr"
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@ -143,14 +314,21 @@ version = "1.15.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0fac9e2da13b5eb447a6ce3d392f23a29d8694bff781bf03a16cd9ac8697593b"
dependencies = [
"hermit-abi",
"hermit-abi 0.2.6",
"libc",
]
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name = "once_cell"
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name = "poly"
version = "0.1.0"
dependencies = [
"clap",
"derive_more",
"midly",
"nom",
@ -205,6 +383,20 @@ dependencies = [
"semver",
]
[[package]]
name = "rustix"
version = "0.37.19"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "acf8729d8542766f1b2cf77eb034d52f40d375bb8b615d0b147089946e16613d"
dependencies = [
"bitflags",
"errno",
"io-lifetimes",
"libc",
"linux-raw-sys",
"windows-sys",
]
[[package]]
name = "scopeguard"
version = "1.1.0"
@ -217,6 +409,12 @@ version = "1.0.17"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bebd363326d05ec3e2f532ab7660680f3b02130d780c299bca73469d521bc0ed"
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@ -228,8 +426,91 @@ dependencies = [
"unicode-ident",
]
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name = "syn"
version = "2.0.15"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"quote",
"unicode-ident",
]
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View file

@ -12,4 +12,5 @@ path = "src/bin/main.rs"
[dependencies]
nom = "*"
midly = "0.5.3"
derive_more = "*"
derive_more = "*"
clap = { version = "4.2.7", features = ["derive"] }

View file

@ -1,6 +1,83 @@
use poly::dsl;
use std::collections::HashMap;
use std::process::exit;
use poly::dsl::dsl;
use poly::midi;
use poly::midi::core::Part;
use clap::*;
#[derive(Debug, Parser)]
#[command(name = "poly")]
#[command(author = "Denis Redozubov <denis.redozubov@gmail.com>")]
#[command(version = "0.1")]
#[command(about = "Polyrhythmically-inclinded Midi Drum generator", long_about = None)]
struct Cli {
#[arg(short = 'k', default_value = None)]
kick: Option<String>,
#[arg(short = 's', default_value = None)]
snare: Option<String>,
#[arg(short = 'h', default_value = None)]
hihat: Option<String>,
#[arg(short = 'c', default_value = None)]
crash: Option<String>,
#[arg(short = 't', default_value = "120")]
tempo: String,
#[arg(short = 'S', default_value = "4/4")]
time_signature: String,
#[arg(short = 'o', default_value = None)]
output: Option<String>
}
fn part_to_instrument(part: Part) -> String {
match part {
Part::KickDrum => String::from("Kick Drum"),
Part::SnareDrum => String::from("Snare Drum"),
Part::HiHat => String::from("Hi-Hat"),
Part::CrashCymbal => String::from("Crash Cymbal"),
}
}
fn validate_and_parse_part(cli: Option<String>, part: Part, patterns: &mut HashMap<Part, Vec<dsl::Group>>) -> () {
match cli {
None => {},
Some(pattern) => {
match dsl::groups(pattern.as_str()) {
Ok((_, group)) => { patterns.insert(part, group); },
Err(e) => {
println!("{} pattern is malformed.", part_to_instrument(part));
exit(1)
}
}
}
}
}
fn main() {
println!("Hello, world!");
let matches = Cli::parse();
let mut drum_patterns : HashMap<Part, Vec<dsl::Group>> = HashMap::new();
match matches {
Cli { kick, snare, hihat, crash, tempo, time_signature, output} => {
if kick == None && snare == None && hihat == None && crash == None {
println!("No drum pattern was supplied, exiting...");
exit(1)
} else if output == None {
println!("No output file path was supplied, running a dry run...")
} else {
validate_and_parse_part(kick, Part::KickDrum, &mut drum_patterns);
validate_and_parse_part(snare, Part::SnareDrum, &mut drum_patterns);
validate_and_parse_part(hihat, Part::HiHat, &mut drum_patterns);
validate_and_parse_part(crash, Part::CrashCymbal, &mut drum_patterns);
}
}
}
}

View file

@ -9,7 +9,7 @@ use nom::branch::alt;
use nom::combinator::{map, map_res};
#[derive(Debug, Clone, PartialEq, Eq)]
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum BasicLength {
Whole,
Half,
@ -20,26 +20,26 @@ pub enum BasicLength {
SixtyFourth
}
#[derive(Debug, Clone, PartialEq, Eq)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ModdedLength {
Plain(BasicLength),
Dotted(BasicLength)
}
#[derive(Debug, Clone, PartialEq, Eq)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Length {
Simple(ModdedLength),
Tied(ModdedLength, ModdedLength),
Triplet(ModdedLength)
}
#[derive(Debug, Clone, PartialEq, Eq)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Note {
Hit,
Rest
}
#[derive(Debug, Clone, PartialEq, Eq)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Times(pub u16);
#[derive(Debug, Clone, PartialEq, Eq)]
@ -49,38 +49,76 @@ pub enum GroupOrNote {
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Group { notes: Vec<GroupOrNote>, length: Length, times: Times }
pub struct Group {
pub notes: Vec<GroupOrNote>,
pub length: Length,
pub times: Times
}
static WHOLE : Length = Length::Simple(ModdedLength::Plain(BasicLength::Whole));
static HALF : Length = Length::Simple(ModdedLength::Plain(BasicLength::Half));
static FOURTH : Length = Length::Simple(ModdedLength::Plain(BasicLength::Fourth));
static EIGHTH : Length = Length::Simple(ModdedLength::Plain(BasicLength::Eighth));
static SIXTEENTH : Length = Length::Simple(ModdedLength::Plain(BasicLength::Sixteenth));
static THIRTY_SECOND : Length = Length::Simple(ModdedLength::Plain(BasicLength::ThirtySecond));
static SIXTY_FOURTH : Length = Length::Simple(ModdedLength::Plain(BasicLength::SixtyFourth));
impl std::ops::Deref for Group {
type Target = Vec<GroupOrNote>;
static WHOLE_DOTTED_TRIPLET : Length = Length::Triplet(ModdedLength::Dotted(BasicLength::Whole));
static HALF_DOTTED_TRIPLET : Length = Length::Triplet(ModdedLength::Dotted(BasicLength::Half));
static FOURTH_DOTTED_TRIPLET : Length = Length::Triplet(ModdedLength::Dotted(BasicLength::Fourth));
static EIGHTH_DOTTED_TRIPLET : Length = Length::Triplet(ModdedLength::Dotted(BasicLength::Eighth));
static SIXTEENTH_DOTTED_TRIPLET : Length = Length::Triplet(ModdedLength::Dotted(BasicLength::Sixteenth));
static THIRTY_SECOND_DOTTED_TRIPLET : Length = Length::Triplet(ModdedLength::Dotted(BasicLength::ThirtySecond));
static SIXTY_FOURTH_DOTTED_TRIPLET : Length = Length::Triplet(ModdedLength::Dotted(BasicLength::SixtyFourth));
fn deref(&self) -> &Self::Target {
&self.notes
}
}
static WHOLE_TRIPLET : Length = Length::Triplet(ModdedLength::Plain(BasicLength::Whole));
static HALF_TRIPLET : Length = Length::Triplet(ModdedLength::Plain(BasicLength::Half));
static FOURTH_TRIPLET : Length = Length::Triplet(ModdedLength::Plain(BasicLength::Fourth));
static EIGHTH_TRIPLET : Length = Length::Triplet(ModdedLength::Plain(BasicLength::Eighth));
static SIXTEENTH_TRIPLET : Length = Length::Triplet(ModdedLength::Plain(BasicLength::Sixteenth));
static THIRTY_SECOND_TRIPLET : Length = Length::Triplet(ModdedLength::Plain(BasicLength::ThirtySecond));
static SIXTY_FOURTH_TRIPLET : Length = Length::Triplet(ModdedLength::Plain(BasicLength::SixtyFourth));
#[allow(dead_code)]
static WHOLE : &Length = &Length::Simple(ModdedLength::Plain(BasicLength::Whole));
#[allow(dead_code)]
static HALF : &Length = &Length::Simple(ModdedLength::Plain(BasicLength::Half));
#[allow(dead_code)]
static FOURTH : &Length = &Length::Simple(ModdedLength::Plain(BasicLength::Fourth));
#[allow(dead_code)]
static EIGHTH : &Length = &Length::Simple(ModdedLength::Plain(BasicLength::Eighth));
#[allow(dead_code)]
static SIXTEENTH : &Length = &Length::Simple(ModdedLength::Plain(BasicLength::Sixteenth));
#[allow(dead_code)]
static THIRTY_SECOND : &Length = &Length::Simple(ModdedLength::Plain(BasicLength::ThirtySecond));
#[allow(dead_code)]
static SIXTY_FOURTH : &Length = &Length::Simple(ModdedLength::Plain(BasicLength::SixtyFourth));
#[allow(dead_code)]
static WHOLE_DOTTED_TRIPLET : &Length = &Length::Triplet(ModdedLength::Dotted(BasicLength::Whole));
#[allow(dead_code)]
static HALF_DOTTED_TRIPLET : &Length = &Length::Triplet(ModdedLength::Dotted(BasicLength::Half));
#[allow(dead_code)]
static FOURTH_DOTTED_TRIPLET : &Length = &Length::Triplet(ModdedLength::Dotted(BasicLength::Fourth));
#[allow(dead_code)]
static EIGHTH_DOTTED_TRIPLET : &Length = &Length::Triplet(ModdedLength::Dotted(BasicLength::Eighth));
#[allow(dead_code)]
static SIXTEENTH_DOTTED_TRIPLET : &Length = &Length::Triplet(ModdedLength::Dotted(BasicLength::Sixteenth));
#[allow(dead_code)]
static THIRTY_SECOND_DOTTED_TRIPLET : &Length = &Length::Triplet(ModdedLength::Dotted(BasicLength::ThirtySecond));
#[allow(dead_code)]
static SIXTY_FOURTH_DOTTED_TRIPLET : &Length = &Length::Triplet(ModdedLength::Dotted(BasicLength::SixtyFourth));
#[allow(dead_code)]
static WHOLE_TRIPLET : &Length = &Length::Triplet(ModdedLength::Plain(BasicLength::Whole));
#[allow(dead_code)]
static HALF_TRIPLET : &Length = &Length::Triplet(ModdedLength::Plain(BasicLength::Half));
#[allow(dead_code)]
static FOURTH_TRIPLET : &Length = &Length::Triplet(ModdedLength::Plain(BasicLength::Fourth));
#[allow(dead_code)]
static EIGHTH_TRIPLET : &Length = &Length::Triplet(ModdedLength::Plain(BasicLength::Eighth));
#[allow(dead_code)]
static SIXTEENTH_TRIPLET : &Length = &Length::Triplet(ModdedLength::Plain(BasicLength::Sixteenth));
#[allow(dead_code)]
static THIRTY_SECOND_TRIPLET : &Length = &Length::Triplet(ModdedLength::Plain(BasicLength::ThirtySecond));
#[allow(dead_code)]
static SIXTY_FOURTH_TRIPLET : &Length = &Length::Triplet(ModdedLength::Plain(BasicLength::SixtyFourth));
#[allow(dead_code)]
static HIT : GroupOrNote = GroupOrNote::SingleNote(Note::Hit);
#[allow(dead_code)]
static REST : GroupOrNote = GroupOrNote::SingleNote(Note::Rest);
static ONCE : Times = Times(1);
static TWICE: Times = Times(2);
static THRICE : Times = Times(3);
#[allow(dead_code)]
static ONCE : &Times = &Times(1);
#[allow(dead_code)]
static TWICE: &Times = &Times(2);
#[allow(dead_code)]
static THRICE : &Times = &Times(3);
fn hit(input: &str) -> IResult<&str, Note> {
@ -104,7 +142,7 @@ fn length_basic(input: &str) -> IResult<&str, BasicLength> {
Ok((r,16)) => Ok((r, BasicLength::Sixteenth)),
Ok((r,32)) => Ok((r, BasicLength::ThirtySecond)),
Ok((r, 64)) => Ok((r, BasicLength::SixtyFourth)),
Ok((r, i)) => {
Ok((r, _)) => {
Err(Err::Error(nom::error::make_error(r, nom::error::ErrorKind::Fail)))
},
Err(e) => Err(e)
@ -150,35 +188,35 @@ fn group_or_delimited_group(input: &str) -> IResult<&str, Group> {
alt((delimited_group, group))(input)
}
fn groups(input: &str) -> IResult<&str, Vec<Group>> {
pub fn groups(input: &str) -> IResult<&str, Vec<Group>> {
many1(group_or_delimited_group)(input)
}
#[test]
fn parse_length() {
assert_eq!(length("16"), Ok(("", SIXTEENTH.clone())));
assert_eq!(length("16"), Ok(("", *SIXTEENTH)));
assert_eq!(length("8+16"), Ok(("", Length::Tied(ModdedLength::Plain(BasicLength::Eighth), ModdedLength::Plain(BasicLength::Sixteenth)))));
assert_eq!(length("8t"), Ok(("", EIGHTH_TRIPLET.clone())));
assert_eq!(length("4.t"), Ok(("", FOURTH_DOTTED_TRIPLET.clone())));
assert_eq!(length("8t"), Ok(("", *EIGHTH_TRIPLET)));
assert_eq!(length("4.t"), Ok(("", *FOURTH_DOTTED_TRIPLET)));
}
#[test]
fn parse_group() {
assert_eq!(group("16x--x-"), Ok(("", Group { times: ONCE.clone(), notes: vec![HIT.clone(), REST.clone(), REST.clone(), HIT.clone(), REST.clone()], length: SIXTEENTH.clone()})));
assert_eq!(group("8txxx"), Ok(("", Group { times: ONCE.clone(), notes: vec![HIT.clone(), HIT.clone(), HIT.clone()], length: EIGHTH_TRIPLET.clone()})));
assert_eq!(group("16+32x-xx"), Ok(("", Group { times: ONCE.clone(), notes: vec![HIT.clone(), REST.clone(), HIT.clone(), HIT.clone()], length: Length::Tied(ModdedLength::Plain(BasicLength::Sixteenth), ModdedLength::Plain(BasicLength::ThirtySecond))})));
assert_eq!(group("3,16xx"), Ok(("", Group { times: THRICE.clone(), length: SIXTEENTH.clone(), notes: vec![HIT.clone(), HIT.clone()] })));
assert_eq!(group("16x--x-"), Ok(("", Group { times: *ONCE, notes: vec![HIT.clone(), REST.clone(), REST.clone(), HIT.clone(), REST.clone()], length: *SIXTEENTH})));
assert_eq!(group("8txxx"), Ok(("", Group { times: *ONCE, notes: vec![HIT.clone(), HIT.clone(), HIT.clone()], length: *EIGHTH_TRIPLET})));
assert_eq!(group("16+32x-xx"), Ok(("", Group { times: *ONCE, notes: vec![HIT.clone(), REST.clone(), HIT.clone(), HIT.clone()], length: Length::Tied(ModdedLength::Plain(BasicLength::Sixteenth), ModdedLength::Plain(BasicLength::ThirtySecond))})));
assert_eq!(group("3,16xx"), Ok(("", Group { times: *THRICE, length: *SIXTEENTH, notes: vec![HIT.clone(), HIT.clone()] })));
}
#[test]
fn parse_delimited_group() {
assert_eq!(delimited_group("(3,16x--x-)"), Ok(("", Group { times: THRICE.clone(), notes: vec![HIT.clone(), REST.clone(), REST.clone(), HIT.clone(), REST.clone()], length: SIXTEENTH.clone()})));
assert_eq!(delimited_group("(3,16x--x-)"), Ok(("", Group { times: *THRICE, notes: vec![HIT.clone(), REST.clone(), REST.clone(), HIT.clone(), REST.clone()], length: *SIXTEENTH})));
}
#[test]
fn parse_group_or_delimited_group() {
assert_eq!(group_or_delimited_group("(3,16x--x-)"), Ok(("", Group { times: THRICE.clone(), notes: vec![HIT.clone(), REST.clone(), REST.clone(), HIT.clone(), REST.clone()], length: SIXTEENTH.clone()})));
assert_eq!(group_or_delimited_group("16x--x-"), Ok(("", Group { times: ONCE.clone(), notes: vec![HIT.clone(), REST.clone(), REST.clone(), HIT.clone(), REST.clone()], length: SIXTEENTH.clone()})));
assert_eq!(group_or_delimited_group("(3,16x--x-)"), Ok(("", Group { times: *THRICE, notes: vec![HIT.clone(), REST.clone(), REST.clone(), HIT.clone(), REST.clone()], length: *SIXTEENTH})));
assert_eq!(group_or_delimited_group("16x--x-"), Ok(("", Group { times: *ONCE, notes: vec![HIT.clone(), REST.clone(), REST.clone(), HIT.clone(), REST.clone()], length: *SIXTEENTH})));
}
// “x” hit

View file

@ -1,2 +1 @@
pub mod dsl;
pub mod process;
pub mod dsl;

View file

@ -1,6 +0,0 @@
use super::dsl::{BasicLength};
pub struct TimeSignature {
numerator: u8,
denominator: BasicLength
}

View file

@ -1,7 +1,8 @@
extern crate derive_more;
use std::collections::HashMap;
use derive_more::{Mul, Add};
use midly::{Smf, Header, live::LiveEvent, MidiMessage, num::u15};
use std::convert::{TryFrom};
use midly::{Smf, Header, live::LiveEvent, MidiMessage, num::u15, Track};
use crate::dsl::dsl::{Group, Length, ModdedLength, BasicLength};
@ -17,10 +18,25 @@ pub struct Tick(pub u128);
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum EventType {
NoteOn,
NoteOff,
Tempo,
Signature
NoteOn(Part),
NoteOff(Part),
Tempo(u8),
Signature(TimeSignature)
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct TimeSignature {
pub numerator: u8,
pub denominator: BasicLength
}
#[derive(Debug, Clone, Copy, PartialEq, PartialOrd, Ord, Eq, Hash)]
pub enum Part {
KickDrum,
SnareDrum,
HiHat,
CrashCymbal
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
@ -32,6 +48,7 @@ pub struct Event {
// Events are supposed to be sorted.
pub type EventGrid = Vec<Event>;
#[allow(dead_code)]
static TICKS_PER_QUARTER_NOTE : u16 = 48;
fn basic_length_to_ticks(basic_length: BasicLength) -> Tick {
@ -69,42 +86,66 @@ fn length_to_ticks(length: Length) -> Tick {
}
}
fn flatten_group(Group { notes, length, times }: Group, start: Tick) -> EventGrid {
fn flatten_group(Group { notes, length, times }: &Group, part: Part, start: &mut Tick, grid: &mut EventGrid) -> EventGrid {
let mut time = start;
let note_length = length_to_ticks(length);
let note_length = length_to_ticks(*length);
let mut grid = Vec::new();
let ticks = length_to_ticks(length);
for entry in notes.iter() { |entry|
match entry {
crate::dsl::dsl::GroupOrNote::SingleGroup(_) => todo!(),
crate::dsl::dsl::GroupOrNote::SingleNote(Rest) => { time = time + note_length },
crate::dsl::dsl::GroupOrNote::SingleGroup(group) => {
flatten_group(&group, part, time , &mut grid).repeat(times.0 as usize);
},
crate::dsl::dsl::GroupOrNote::SingleNote(Rest) => { *time = *time + note_length; },
crate::dsl::dsl::GroupOrNote::SingleNote(Hit) => {
let note_end = time + note_length;
let note_on = Event { tick: time, event_type: EventType::NoteOn };
let note_off = Event { tick: note_end, event_type: EventType::NoteOff };
let note_end = *time + note_length;
let note_on = Event { tick: *time, event_type: EventType::NoteOn(part) };
let note_off = Event { tick: note_end, event_type: EventType::NoteOff(part) };
grid.push(note_on);
grid.push(note_off);
time = note_end;
*time = note_end;
},
};
}
grid.repeat(times.0 as usize)
grid
}
fn flatten_groups(groups: Vec<Group>) -> EventGrid {
let mut out : EventGrid = Vec::new();
groups.iter().flat_map(|Group { notes, length, times }| {
}).collect()
fn flatten_groups(part: Part, groups: Vec<Group>) -> EventGrid {
let mut time : Tick = Tick(0);
let mut grid : EventGrid = Vec::new();
groups.iter().for_each(|group| {
flatten_group(group, part, &mut time, &mut grid);
});
grid
}
fn combine_event_grids<'a>(a: &'a mut EventGrid, b : &'a mut EventGrid) -> &'a mut EventGrid {
a.append(b);
a.sort_by(|e1, e2| { e1.tick.cmp(&e2.tick)} );
a
}
fn merge_event_grids(mut eg: Vec<EventGrid>) -> EventGrid {
let first = eg.pop().unwrap();
eg.iter_mut().fold(first, |mut acc, next| {
combine_event_grids(&mut acc, next);
acc
})
}
fn flatten_and_merge(groups: HashMap<Part, Vec<Group>>) -> EventGrid {
let mut eg = Vec::new();
for (part, group) in groups {
eg.push(flatten_groups(part, group))
}
merge_event_grids(eg)
}
// 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.
fn create_smf<'a>() -> Smf<'a> {
let tracks = vec![]; // FIXME
fn create_smf<'a>(groups: HashMap<Part, Vec<Group>>) -> Smf<'a> {
let tracks = vec![]; //create_tracks(groups); // 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.clone()));
let metrical = midly::Timing::Metrical(u15::new(TICKS_PER_QUARTER_NOTE));
Smf { header: Header { format: midly::Format::Parallel, timing: metrical }, tracks: tracks }
}