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refactor flatten_and_merge

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This commit is contained in:
Denis Redozubov 2023-06-14 20:07:21 +04:00
parent 6a7e9cf0a9
commit 970c0a0b9a
1 changed files with 15 additions and 50 deletions
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65
src/midi/core.rs
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@ -707,7 +707,7 @@ fn test_event_iterator_impl() {
/// 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(
fn flatten_to_iterator(
groups: BTreeMap<Part, Groups>,
time_signature: TimeSignature,
) -> EventIterator {
@ -728,56 +728,21 @@ fn flatten_and_merge(
}
let length_limit = converges_over_bars * time_signature.to_128th();
let (kick_grid, kick_repeats) = match groups.get(&KickDrum) {
Some(groups) => {
let length_128th = length_map.get(&KickDrum).unwrap();
let number_of_groups = groups.0.len();
let times = length_limit / length_128th;
(
flatten_groups(KickDrum, groups),
number_of_groups * times as usize,
)
let flatten = |part| {
match groups.get(part) {
Some(groups) => {
let length_128th = length_map.get(part).unwrap();
let times = length_limit / length_128th;
(flatten_groups(*part, groups), times)
}
None => (EventGrid::empty(), 0),
}
None => (EventGrid::empty(), 0),
};
let (snare_grid, snare_repeats) = match groups.get(&SnareDrum) {
Some(groups) => {
let length_128th = length_map.get(&SnareDrum).unwrap();
let number_of_groups = groups.0.len();
let times = length_limit / length_128th;
(
flatten_groups(SnareDrum, groups),
number_of_groups * times as usize,
)
}
None => (EventGrid::empty(), 0),
};
let (hihat_grid, hihat_repeats) = match groups.get(&HiHat) {
Some(groups) => {
let length_128th = length_map.get(&HiHat).unwrap();
let number_of_groups = groups.0.len();
let times = length_limit / length_128th;
(
flatten_groups(HiHat, groups),
number_of_groups * times as usize,
)
}
None => (EventGrid::empty(), 0),
};
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, // suspect, gives 2 instead of one for 4/4 crash
)
}
None => (EventGrid::empty(), 0),
};
println!("Crash grid: {:?}\n crash_repeats: {}", crash_grid, crash_repeats);
let (kick_grid, kick_repeats) = flatten(&KickDrum);
let (snare_grid, snare_repeats) = flatten(&SnareDrum);
let (hihat_grid, hihat_repeats) = flatten(&HiHat);
let (crash_grid, crash_repeats) = flatten(&CrashCymbal);
EventIterator::new(
cycle_grid(kick_grid, Times(kick_repeats as u16)),
@ -860,7 +825,7 @@ fn create_tracks<'a>(
text_event: &'a str,
midi_tempo: MidiTempo
) -> Vec<Vec<midly::TrackEvent<'a>>> {
let events_iter = flatten_and_merge(parts_and_groups, time_signature);
let events_iter = flatten_to_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() {