jitsi_app_c0/react/features/video-quality/middleware.js

// @flow

import { CONFERENCE_JOINED } from '../base/conference/actionTypes';
import { setPreferredVideoQuality } from '../base/conference/actions';
import { MiddlewareRegistry } from '../base/redux';

import logger from './logger';

/**
 * Implements the middleware of the feature video-quality.
 *
 * @param {Store} store - The redux store.
 * @returns {Function}
 */
MiddlewareRegistry.register(({ dispatch, getState }) => next => action => {
    const result = next(action);

    switch (action.type) {
    case CONFERENCE_JOINED: {
        if (navigator.product === 'ReactNative') {
            const { resolution } = getState()['features/base/config'];

            if (typeof resolution !== 'undefined') {
                dispatch(setPreferredVideoQuality(Number.parseInt(resolution, 10)));
                logger.info(`Configured preferred receiver video frame height to: ${resolution}`);
            }
        }
        break;
    }
    }

    return result;
});