111 lines
3.2 KiB
JavaScript
111 lines
3.2 KiB
JavaScript
// vim: set et sw=2 ts=2:
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//
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// This file is part of Moonfire NVR, a security camera network video recorder.
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// Copyright (C) 2018 The Moonfire NVR Authors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// In addition, as a special exception, the copyright holders give
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// permission to link the code of portions of this program with the
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// OpenSSL library under certain conditions as described in each
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// individual source file, and distribute linked combinations including
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// the two.
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//
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// You must obey the GNU General Public License in all respects for all
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// of the code used other than OpenSSL. If you modify file(s) with this
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// exception, you may extend this exception to your version of the
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// file(s), but you are not obligated to do so. If you do not wish to do
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// so, delete this exception statement from your version. If you delete
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// this exception statement from all source files in the program, then
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// also delete it here.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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import Range from './Range';
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/**
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* WeakMap that keeps our private data.
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*
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* @type {WeakMap}
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*/
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const _range = new WeakMap();
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/**
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* Class like Range to represent ranges over timestamps in 90k format.
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*
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* A composed member of the Range class is use for the heavy lifting, while
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* this class provides a different interface.
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*/
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export default class Range90k {
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/**
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* Create a range.
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*
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* @param {Number} low Low value (inclusive) in range.
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* @param {Number} high High value (inclusive) in range.
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*/
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constructor(low, high) {
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_range.set(this, new Range(low, high));
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}
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/**
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* Return the range's start time.
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*
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* @return {Number} Number in 90k units
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*/
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get startTime90k() {
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return _range.get(this).low;
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}
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/**
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* Return the range's end time.
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*
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* @return {Number} Number in 90k units
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*/
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get endTime90k() {
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return _range.get(this).high;
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}
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/**
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* Return the range's duration.
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*
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* @return {Number} Number in 90k units
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*/
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get duration90k() {
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return _range.get(this).size;
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}
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/**
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* Create a new range by trimming the current range against
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* another.
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*
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* The returned range will lie completely within the provided range.
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*
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* @param {Range90k} against Range the be used for limits
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* @return {Range90k} The trimmed range (always a new object)
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*/
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trimmed(against) {
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return new Range90k(
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Math.max(this.startTime90k, against.startTime90k),
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Math.min(this.endTime90k, against.endTime90k)
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);
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}
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/**
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* Return a copy of this range.
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*
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* @return {Range90k} A copy of this range object.
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*/
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clone() {
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return new Range90k(this.startTime90k, this.endTime90k);
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}
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}
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