theluyuan
38ba663466
Some checks failed
Close stale issues and PRs / stale (push) Has been cancelled
25 lines
883 B
TypeScript
25 lines
883 B
TypeScript
import { VIDEO_QUALITY_LEVELS } from '../../video-quality/constants';
|
|
|
|
/**
|
|
* Determines the lastN value to be used for the conference based on the video quality selected.
|
|
*
|
|
* @param {string} qualityLevel - Quality level (height) selected.
|
|
* @param {number} channelLastN - LastN value set for the whole conference.
|
|
* @returns {number} LastN value applicable to the quality level specified.
|
|
*/
|
|
export function getLastNForQualityLevel(qualityLevel: number, channelLastN: number) {
|
|
let lastN = channelLastN;
|
|
|
|
const videoQualityLevels = Object.values(VIDEO_QUALITY_LEVELS);
|
|
|
|
for (const lvl in videoQualityLevels) {
|
|
if (videoQualityLevels.hasOwnProperty(lvl)
|
|
&& qualityLevel === videoQualityLevels[lvl]
|
|
&& Number(lvl) > 1) {
|
|
lastN = Math.floor(channelLastN / Math.pow(2, Number(lvl) - 1));
|
|
}
|
|
}
|
|
|
|
return lastN;
|
|
}
|