jiti-meet/react/features/video-quality/functions.js

63 lines
2.2 KiB
JavaScript

// @flow
import { VIDEO_QUALITY_LEVELS } from '../base/conference';
import { CFG_LVL_TO_APP_QUALITY_LVL } from './constants';
/**
* Selects {@code VIDEO_QUALITY_LEVELS} for the given {@link availableHeight} and threshold to quality mapping.
*
* @param {number} availableHeight - The height to which a matching video quality level should be found.
* @param {Map<number, number>} heightToLevel - The threshold to quality level mapping. The keys are sorted in the
* ascending order.
* @returns {number} The matching value from {@code VIDEO_QUALITY_LEVELS}.
*/
export function getReceiverVideoQualityLevel(availableHeight: number, heightToLevel: Map<number, number>): number {
let selectedLevel = VIDEO_QUALITY_LEVELS.LOW;
for (const [ levelThreshold, level ] of heightToLevel.entries()) {
if (availableHeight >= levelThreshold) {
selectedLevel = level;
}
}
return selectedLevel;
}
/**
* Converts {@code Object} passed in the config which represents height thresholds to vide quality level mapping to
* a {@code Map}.
*
* @param {Object} minHeightForQualityLvl - The 'config.videoQuality.minHeightForQualityLvl' Object from
* the configuration. See config.js for more details.
* @returns {Map<number, number>|undefined} - A mapping of minimal thumbnail height required for given quality level or
* {@code undefined} if the map contains invalid values.
*/
export function validateMinHeightForQualityLvl(minHeightForQualityLvl: Object): ?Map<number, number> {
if (typeof minHeightForQualityLvl !== 'object'
|| Object.keys(minHeightForQualityLvl).map(lvl => Number(lvl))
.find(lvl => lvl === null || isNaN(lvl) || lvl < 0)) {
return undefined;
}
const levelsSorted
= Object.keys(minHeightForQualityLvl)
.map(k => Number(k))
.sort((a, b) => a - b);
const map = new Map();
for (const level of levelsSorted) {
const configQuality = minHeightForQualityLvl[level];
const appQuality = CFG_LVL_TO_APP_QUALITY_LVL[configQuality];
if (!appQuality) {
return undefined;
}
map.set(level, appQuality);
}
return map;
}