fix(config) Remove the code related to lastN limits which is not used anymore.

config.js

@@ -422,22 +422,6 @@ var config = {
     // value will be used when the quality level is selected using "Manage Video Quality" slider.
     // startLastN: 1,
 
-    // Provides a way to use different "last N" values based on the number of participants in the conference.
-    // The keys in an Object represent number of participants and the values are "last N" to be used when number of
-    // participants gets to or above the number.
-    //
-    // For the given example mapping, "last N" will be set to 20 as long as there are at least 5, but less than
-    // 29 participants in the call and it will be lowered to 15 when the 30th participant joins. The 'channelLastN'
-    // will be used as default until the first threshold is reached.
-    //
-    // lastNLimits: {
-    //     5: 20,
-    //     30: 15,
-    //     50: 10,
-    //     70: 5,
-    //     90: 2,
-    // },
-
     // Specify the settings for video quality optimizations on the client.
     // videoQuality: {
     //    // Provides a way to prevent a video codec from being negotiated on the JVB connection. The codec specified

react/features/base/config/configType.ts

@@ -400,9 +400,6 @@ export interface IConfig {
     jaasActuatorUrl?: string;
     jaasFeedbackMetadataURL?: string;
     jaasTokenUrl?: string;
-    lastNLimits?: {
-        [key: number]: number;
-    };
     legalUrls?: {
         helpCentre: string;
         privacy: string;

react/features/base/lastn/functions.ts

@@ -22,60 +22,3 @@ export function getLastNForQualityLevel(qualityLevel: number, channelLastN: numb
 
     return lastN;
 }
-
-/**
- * Checks if the given Object is a correct last N limit mapping, converts both keys and values to numbers and sorts
- * the keys in ascending order.
- *
- * @param {Object} lastNLimits - The Object to be verified.
- * @returns {undefined|Map<number, number>}
- */
-export function validateLastNLimits(lastNLimits: any) {
-    // Checks if only numbers are used
-    if (typeof lastNLimits !== 'object'
-        || !Object.keys(lastNLimits).length
-        || Object.keys(lastNLimits)
-            .find(limit => limit === null || isNaN(Number(limit))
-                || lastNLimits[limit] === null || isNaN(Number(lastNLimits[limit])))) {
-        return undefined;
-    }
-
-    // Converts to numbers and sorts the keys
-    const sortedMapping = new Map();
-    const orderedLimits = Object.keys(lastNLimits)
-        .map(n => Number(n))
-        .sort((n1, n2) => n1 - n2);
-
-    for (const limit of orderedLimits) {
-        sortedMapping.set(limit, Number(lastNLimits[limit]));
-    }
-
-    return sortedMapping;
-}
-
-/**
- * Returns "last N" value which corresponds to a level defined in the {@code lastNLimits} mapping. See
- * {@code config.js} for more detailed explanation on how the mapping is defined.
- *
- * @param {number} participantsCount - The current number of participants in the conference.
- * @param {Map<number, number>} [lastNLimits] - The mapping of number of participants to "last N" values. NOTE that
- * this function expects a Map that has been preprocessed by {@link validateLastNLimits}, because the keys must be
- * sorted in ascending order and both keys and values should be numbers.
- * @returns {number|undefined} - A "last N" number if there was a corresponding "last N" value matched with the number
- * of participants or {@code undefined} otherwise.
- */
-export function limitLastN(participantsCount: number, lastNLimits?: Map<number, number>) {
-    if (!lastNLimits || !lastNLimits.keys) {
-        return undefined;
-    }
-
-    let selectedLimit;
-
-    for (const participantsN of lastNLimits.keys()) {
-        if (participantsCount >= participantsN) {
-            selectedLimit = participantsN;
-        }
-    }
-
-    return selectedLimit ? lastNLimits.get(selectedLimit) : undefined;
-}

react/features/base/lastn/middleware.ts

@@ -16,15 +16,11 @@ import {
     PARTICIPANT_KICKED,
     PARTICIPANT_LEFT
 } from '../participants/actionTypes';
-import {
+import { getParticipantById } from '../participants/functions';
-    getParticipantById,
-    getParticipantCount
-} from '../participants/functions';
 import MiddlewareRegistry from '../redux/MiddlewareRegistry';
 import { isLocalVideoTrackDesktop } from '../tracks/functions';
 
 import { setLastN } from './actions';
-import { limitLastN } from './functions';
 import logger from './logger';
 
 /**
@@ -48,8 +44,6 @@ const _updateLastN = debounce(({ dispatch, getState }: IStore) => {
     const { appState } = state['features/background'] || {};
     const { enabled: filmStripEnabled } = state['features/filmstrip'];
     const config = state['features/base/config'];
-    const { lastNLimits } = state['features/base/lastn'];
-    const participantCount = getParticipantCount(state);
     const { carMode } = state['features/video-layout'];
 
     // Select the (initial) lastN value based on the following preference order.
@@ -58,13 +52,6 @@ const _updateLastN = debounce(({ dispatch, getState }: IStore) => {
     // 3. -1 as the default value.
     let lastNSelected = config.startLastN ?? (config.channelLastN ?? -1);
 
-    // Apply last N limit based on the # of participants and config settings.
-    const limitedLastN = limitLastN(participantCount, lastNLimits);
-
-    if (limitedLastN !== undefined) {
-        lastNSelected = lastNSelected === -1 ? limitedLastN : Math.min(limitedLastN, lastNSelected);
-    }
-
     if (typeof appState !== 'undefined' && appState !== 'active') {
         lastNSelected = isLocalVideoTrackDesktop(state) ? 1 : 0;
     } else if (carMode) {

react/features/base/lastn/reducer.ts

@@ -1,22 +1,13 @@
-import {
-    SET_CONFIG
-} from '../config/actionTypes';
-import { IConfig } from '../config/configType';
 import ReducerRegistry from '../redux/ReducerRegistry';
-import { set } from '../redux/functions';
 
 import { SET_LAST_N } from './actionTypes';
-import { validateLastNLimits } from './functions';
 
 export interface ILastNState {
     lastN?: number;
-    lastNLimits?: Map<number, number>;
 }
 
 ReducerRegistry.register<ILastNState>('features/base/lastn', (state = {}, action): ILastNState => {
     switch (action.type) {
-    case SET_CONFIG:
-        return _setConfig(state, action);
     case SET_LAST_N: {
         const { lastN } = action;
 
@@ -29,15 +20,3 @@ ReducerRegistry.register<ILastNState>('features/base/lastn', (state = {}, action
 
     return state;
 });
-
-/**
- * Reduces a specific Redux action SET_CONFIG.
- *
- * @param {Object} state - The Redux state of feature base/lastn.
- * @param {Action} action - The Redux action SET_CONFIG to reduce.
- * @private
- * @returns {Object} The new state after the reduction of the specified action.
- */
-function _setConfig(state: ILastNState, { config }: { config: IConfig; }) {
-    return set(state, 'lastNLimits', validateLastNLimits(config.lastNLimits));
-}