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note_event.go
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note_event.go
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package core
import (
"encoding/json"
"fmt"
"os"
"time"
"github.com/emicklei/melrose/notify"
)
type NoteEvent struct {
Start time.Time `json:"start"`
End time.Time `json:"end"`
Number int `json:"number"`
Velocity int `json:"velocity"`
}
func (e NoteEvent) WithEnd(end time.Time) NoteEvent {
return NoteEvent{Start: e.Start, Number: e.Number, Velocity: e.Velocity, End: end}
}
func NotesEventsToFile(events []NoteEvent, name string) {
out, err := os.Create(name)
if err != nil {
notify.Errorf("NotesEventsToFile:%v", err)
return
}
defer out.Close()
enc := json.NewEncoder(out)
enc.SetIndent("", "\t")
if err := enc.Encode(events); err != nil {
notify.Errorf("NotesEventsToFile:%v", err)
}
}
func NoteEventsFromFile(name string) (list []NoteEvent) {
in, err := os.Open(name)
if err != nil {
notify.Errorf("NoteEventsFromFile:%v", err)
return
}
defer in.Close()
dec := json.NewDecoder(in)
if err := dec.Decode(&list); err != nil {
notify.Errorf("NoteEventsFromFile:%v", err)
}
return
}
func NoteEventsToPeriods(events []NoteEvent) (list []NotePeriod) {
for _, each := range events {
list = append(list, NotePeriod{
startMs: each.Start.UnixMilli(),
endMs: each.End.UnixMilli(),
number: each.Number,
velocity: each.Velocity,
})
}
return
}
type NoteEventStatistics struct {
Start, End time.Time
Lowest, Highest int
}
func NoteStatistics(list []NoteEvent) (stats NoteEventStatistics) {
if len(list) == 0 {
return stats
}
stats.Start = list[0].Start
stats.End = list[len(list)-1].End
stats.Lowest = 127
for _, each := range list {
if each.Number < stats.Lowest {
stats.Lowest = each.Number
}
if each.Number > stats.Highest {
stats.Highest = each.Number
}
}
return
}
const eventTimeFormat = "03:04:05.000000000"
func (s NoteEventStatistics) String() string {
return fmt.Sprintf("start=%s,end=%s,low=%d,high=%d", s.Start.Format(eventTimeFormat), s.End.Format(eventTimeFormat), s.Lowest, s.Highest)
}
type NoteChange struct {
isOn bool
note int64
velocity int64
}
func (n NoteChange) Number() int {
return int(n.note)
}
func (n NoteChange) Velocity() int {
return int(n.velocity)
}
func (n NoteChange) IsOn() bool {
return n.isOn
}
func (n NoteChange) NoteChangesDo(block func(NoteChange)) { block(n) }
func NewNoteChange(isOn bool, midiNr int64, velocity int64) NoteChange {
return NoteChange{
isOn: isOn,
note: midiNr,
velocity: velocity,
}
}
func (n NoteChange) Handle(tim *Timeline, when time.Time) {
// NOP
}