webpd/dist/src/nodes/global-code/timing.js

WebPd is a compiler for audio programming language Pure Data allowing to run .pd patches on web pages.

import { Func, Var } from '../../../node_modules/@webpd/compiler/dist/src/ast/declare.js';

/*
 * Copyright (c) 2022-2023 Sébastien Piquemal <sebpiq@protonmail.com>, Chris McCormick.
 *
 * This file is part of WebPd
 * (see https://github.com/sebpiq/WebPd).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
const computeUnitInSamples = {
    namespace: 'timing',
    // prettier-ignore
    code: () => Func('computeUnitInSamples', [
        Var(`Float`, `sampleRate`),
        Var(`Float`, `amount`),
        Var(`string`, `unit`),
    ], 'Float') `
        if (unit.slice(0, 3) === 'per') {
            if (amount !== 0) {
                amount = 1 / amount
            }
            unit = unit.slice(3)
        }

        if (unit === 'msec' || unit === 'milliseconds' || unit === 'millisecond') {
            return amount / 1000 * sampleRate
        } else if (unit === 'sec' || unit === 'seconds' || unit === 'second') {
            return amount * sampleRate
        } else if (unit === 'min' || unit === 'minutes' || unit === 'minute') {
            return amount * 60 * sampleRate
        } else if (unit === 'samp' || unit === 'samples' || unit === 'sample') {
            return amount
        } else {
            throw new Error("invalid time unit : " + unit)
        }
    `
};

export { computeUnitInSamples };