44 lines
1.3 KiB
JavaScript
44 lines
1.3 KiB
JavaScript
/* global rtcpeers */
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import { useEffect } from 'react';
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/**
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* This hook will switch between one of the 3 simulcast layers
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* depending on the number of participants present on the call
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* to optimise bandwidth / cpu usage
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*
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* Note: the API for this feature is currently work in progress
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* and not documented. Momentarily we are using an internal
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* method `setPreferredLayerForTrack` found on the global
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* `rtcpeers` object.
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*
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* Note: this will have no effect when not in SFU mode
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*/
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export const usePreferredLayer = (participants) => {
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/**
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* Set bandwidth layer based on amount of visible participants
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*/
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useEffect(() => {
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if (typeof rtcpeers === 'undefined' || rtcpeers?.getCurrentType() !== 'sfu')
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return;
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const sfu = rtcpeers.soup;
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const count = participants.length;
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participants.forEach(({ id }) => {
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if (count < 5) {
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// High quality video for calls with < 5 people per page
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sfu.setPreferredLayerForTrack(id, 'cam-video', 2);
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} else if (count < 10) {
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// Medium quality video for calls with < 10 people per page
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sfu.setPreferredLayerForTrack(id, 'cam-video', 1);
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} else {
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// Low quality video for calls with 10 or more people per page
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sfu.setPreferredLayerForTrack(id, 'cam-video', 0);
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}
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});
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}, [participants]);
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};
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export default usePreferredLayer;
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