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add preliminary getFrequency

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This commit is contained in:
Felix Roos 2022-04-16 21:34:05 +02:00
parent 803b50535f
commit 1b35dd0c55
1 changed files with 17 additions and 0 deletions
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17
packages/core/util.mjs
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@ -40,6 +40,23 @@ export const getPlayableNoteValue = (event) => {
return note;
};
// TODO: make this compatible with midi numbers object values
export const getFrequency = (event) => {
let { value, context } = event;
// if value is number => interpret as midi number as long as its not marked as frequency
if (typeof value === 'object' && value.freq) {
return value.freq;
}
/* if (typeof value === 'number' && context.type !== 'frequency') {
value = fromMidi(event.value);
} else */ if (typeof value === 'string' && isNote(value)) {
value = fromMidi(toMidi(event.value));
} else if (typeof value !== 'number') {
throw new Error('not a note or frequency:' + value);
}
return value;
};
// rotate array by n steps (to the left)
export const rotate = (arr, n) => arr.slice(n).concat(arr.slice(0, n));