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/**
*
* @copyright Copyright (c) 2020, Daniel Calviño Sánchez (danxuliu@gmail.com)
*
* @license AGPL-3.0-or-later
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
import {
QUALITY,
VideoConstrainer,
} from './VideoConstrainer'
/**
* Helper to adjust the quality of the sent video based on the current call
* state.
*
* The properties of the local video (like resolution or frame rate) can be
* changed on the fly during a call with immediate effect, without having to
* reconnect to the call. This class uses that feature to dynamically reduce or
* increase the video quality depending on the call state. Basically the goal is
* to reduce the CPU usage when there are too many participants in a call.
*
* @param {object} localMediaModel the model for the local media.
* @param {object} callParticipantCollection the collection.
* that contains the models for the rest of the participants in the call.
*/
export default function SentVideoQualityThrottler(localMediaModel, callParticipantCollection) {
this._localMediaModel = localMediaModel
this._callParticipantCollection = callParticipantCollection
this._videoConstrainer = new VideoConstrainer(localMediaModel)
this._gracePeriodAfterSpeakingTimeout = null
this._speakingOrInGracePeriodAfterSpeaking = false
this._availableVideosThreshold = {}
this._availableVideosThreshold[QUALITY.THUMBNAIL] = 15
this._availableVideosThreshold[QUALITY.VERY_LOW] = 10
this._availableVideosThreshold[QUALITY.LOW] = 7
this._availableVideosThreshold[QUALITY.MEDIUM] = 4
// QUALITY.HIGH otherwise
this._availableAudiosThreshold = {}
this._availableAudiosThreshold[QUALITY.THUMBNAIL] = 40
this._availableAudiosThreshold[QUALITY.VERY_LOW] = 30
this._availableAudiosThreshold[QUALITY.LOW] = 20
this._availableAudiosThreshold[QUALITY.MEDIUM] = 10
// QUALITY.HIGH otherwise
this._handleLocalVideoAvailableChangeBound = this._handleLocalVideoAvailableChange.bind(this)
this._handleAddParticipantBound = this._handleAddParticipant.bind(this)
this._handleRemoveParticipantBound = this._handleRemoveParticipant.bind(this)
this._handleLocalAudioEnabledChangeBound = this._handleLocalAudioEnabledChange.bind(this)
this._handleLocalSpeakingChangeBound = this._handleLocalSpeakingChange.bind(this)
this._adjustVideoQualityIfNeededBound = this._adjustVideoQualityIfNeeded.bind(this)
this._localMediaModel.on('change:videoAvailable', this._handleLocalVideoAvailableChangeBound)
if (this._localMediaModel.get('videoAvailable')) {
this._startListeningToChanges()
}
}
SentVideoQualityThrottler.prototype = {
destroy() {
this._localMediaModel.off('change:videoAvailable', this._handleLocalVideoAvailableChangeBound)
this._stopListeningToChanges()
},
_handleLocalVideoAvailableChange(localMediaModel, videoAvailable) {
if (videoAvailable) {
this._startListeningToChanges()
} else {
this._stopListeningToChanges()
}
},
_startListeningToChanges() {
this._localMediaModel.on('change:videoEnabled', this._adjustVideoQualityIfNeededBound)
this._localMediaModel.on('change:audioEnabled', this._handleLocalAudioEnabledChangeBound)
this._localMediaModel.on('change:speaking', this._handleLocalSpeakingChangeBound)
this._callParticipantCollection.on('add', this._handleAddParticipantBound)
this._callParticipantCollection.on('remove', this._handleRemoveParticipantBound)
this._callParticipantCollection.callParticipantModels.forEach(callParticipantModel => {
callParticipantModel.on('change:videoAvailable', this._adjustVideoQualityIfNeededBound)
callParticipantModel.on('change:audioAvailable', this._adjustVideoQualityIfNeededBound)
})
this._handleLocalSpeakingChange()
this._handleLocalAudioEnabledChange()
this._adjustVideoQualityIfNeeded()
},
_stopListeningToChanges() {
this._localMediaModel.off('change:videoEnabled', this._adjustVideoQualityIfNeededBound)
this._localMediaModel.off('change:audioEnabled', this._handleLocalAudioEnabledChangeBound)
this._localMediaModel.off('change:speaking', this._handleLocalSpeakingChangeBound)
this._callParticipantCollection.off('add', this._handleAddParticipantBound)
this._callParticipantCollection.off('remove', this._handleRemoveParticipantBound)
this._callParticipantCollection.callParticipantModels.forEach(callParticipantModel => {
callParticipantModel.off('change:videoAvailable', this._adjustVideoQualityIfNeededBound)
callParticipantModel.off('change:audioAvailable', this._adjustVideoQualityIfNeededBound)
})
},
_handleAddParticipant(callParticipantCollection, callParticipantModel) {
callParticipantModel.on('change:videoAvailable', this._adjustVideoQualityIfNeededBound)
callParticipantModel.on('change:audioAvailable', this._adjustVideoQualityIfNeededBound)
this._adjustVideoQualityIfNeeded()
},
_handleRemoveParticipant(callParticipantCollection, callParticipantModel) {
callParticipantModel.off('change:videoAvailable', this._adjustVideoQualityIfNeededBound)
callParticipantModel.off('change:audioAvailable', this._adjustVideoQualityIfNeededBound)
this._adjustVideoQualityIfNeeded()
},
_handleLocalAudioEnabledChange() {
if (this._localMediaModel.get('audioEnabled')) {
return
}
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