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import { AnyEvent } from "midifile-ts"
import {
AnyEventFeature,
DeltaTimeProvider,
isSequencerSpecificEvent,
TickProvider,
} from "../track"
import { mapToSignalEvent } from "../track/signalEvents"
import { DistributiveOmit } from "../types"
import { assemble as assembleNotes } from "./noteAssembler"
export function addTick<T extends DeltaTimeProvider>(events: T[]) {
let tick = 0
return events.map((e) => {
const { deltaTime, ...rest } = e
tick += deltaTime
return {
...(rest as DistributiveOmit<T, "deltaTime">),
tick,
}
})
}
export const removeUnnecessaryProps = <T>(e: T): T => {
const { channel, ...ev } = e as any
return ev
}
export const isSupportedEvent = (e: AnyEventFeature): boolean =>
!(e.type === "meta" && e.subtype === "endOfTrack")
const toSignalEvent = <
T extends DistributiveOmit<AnyEvent, "deltaTime"> & TickProvider,
>(
e: T,
) => {
if (isSequencerSpecificEvent(e)) {
return mapToSignalEvent(e)
}
return e
}
export function toTrackEvents(events: AnyEvent[]) {
return assembleNotes(
addTick(events.filter(isSupportedEvent)).map(toSignalEvent),
).map(removeUnnecessaryProps)
}
// toTrackEvents without addTick
export function tickedEventsToTrackEvents(
events: (DistributiveOmit<AnyEvent, "deltaTime"> & TickProvider)[],
) {
return assembleNotes(events.filter(isSupportedEvent).map(toSignalEvent)).map(
removeUnnecessaryProps,
)
}
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