jiti-meet/react/features/base/lastn/middleware.js

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// @flow
import { SET_FILMSTRIP_ENABLED } from '../../filmstrip/actionTypes';
import { SELECT_LARGE_VIDEO_PARTICIPANT } from '../../large-video/actionTypes';
import { APP_STATE_CHANGED } from '../../mobile/background/actionTypes';
import { SCREEN_SHARE_PARTICIPANTS_UPDATED, SET_TILE_VIEW } from '../../video-layout/actionTypes';
import { SET_AUDIO_ONLY } from '../audio-only/actionTypes';
import { CONFERENCE_JOINED } from '../conference/actionTypes';
import { getParticipantById } from '../participants/functions';
import { MiddlewareRegistry } from '../redux';
import logger from './logger';
declare var APP: Object;
MiddlewareRegistry.register(store => next => action => {
const result = next(action);
switch (action.type) {
case APP_STATE_CHANGED:
case CONFERENCE_JOINED:
case SCREEN_SHARE_PARTICIPANTS_UPDATED:
case SELECT_LARGE_VIDEO_PARTICIPANT:
case SET_AUDIO_ONLY:
case SET_FILMSTRIP_ENABLED:
case SET_TILE_VIEW:
_updateLastN(store);
break;
}
return result;
});
/**
* Updates the last N value in the conference based on the current state of the redux store.
*
* @param {Store} store - The redux store.
* @private
* @returns {void}
*/
function _updateLastN({ getState }) {
const state = getState();
const { conference } = state['features/base/conference'];
const { enabled: audioOnly } = state['features/base/audio-only'];
const { appState } = state['features/background'];
const { enabled: filmStripEnabled } = state['features/filmstrip'];
const config = state['features/base/config'];
if (!conference) {
logger.debug('There is no active conference, not updating last N');
return;
}
const defaultLastN = typeof config.channelLastN === 'undefined' ? -1 : config.channelLastN;
let lastN = defaultLastN;
if (appState !== 'active') {
lastN = 0;
} else if (audioOnly) {
const { screenShares, tileViewEnabled } = state['features/video-layout'];
const largeVideoParticipantId = state['features/large-video'].participantId;
const largeVideoParticipant
= largeVideoParticipantId ? getParticipantById(state, largeVideoParticipantId) : undefined;
if (!tileViewEnabled && largeVideoParticipant && !largeVideoParticipant.local) {
lastN = (screenShares || []).includes(largeVideoParticipantId) ? 1 : 0;
} else {
lastN = 0;
}
} else if (!filmStripEnabled) {
lastN = 1;
}
if (conference.getLastN() === lastN) {
return;
}
logger.info(`Setting last N to: ${lastN}`);
try {
conference.setLastN(lastN);
} catch (err) {
logger.error(`Failed to set lastN: ${err}`);
}
}