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xlink:href="#font-size-icon"></use></svg></button></div></div><nav></nav></nav></div><div class="toc-container"><div class="toc-content"><span class="bold">On this page</span><div id="eed4d2a0bfd64539bb9df78095dec881"></div></div></div><div class="body-wrapper"><div class="main-content"><div class="main-wrapper"><section id="source-page" class="source-page"><header><h1 id="title" class="has-anchor">streaming_controllers_AbrController.js</h1></header><article><pre class="prettyprint source lang-js"><code>/** * The copyright in this software is being made available under the BSD License, * included below. This software may be subject to other third party and contributor * rights, including patent rights, and no such rights are granted under this license. * * Copyright (c) 2013, Dash Industry Forum. * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation and/or * other materials provided with the distribution. * * Neither the name of Dash Industry Forum nor the names of its * contributors may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ import ABRRulesCollection from '../rules/abr/ABRRulesCollection'; import Constants from '../constants/Constants'; import MetricsConstants from '../constants/MetricsConstants'; import BitrateInfo from '../vo/BitrateInfo'; import FragmentModel from '../models/FragmentModel'; import EventBus from '../../core/EventBus'; import Events from '../../core/events/Events'; import FactoryMaker from '../../core/FactoryMaker'; import RulesContext from '../rules/RulesContext'; import SwitchRequest from '../rules/SwitchRequest'; import SwitchRequestHistory from '../rules/SwitchRequestHistory'; import DroppedFramesHistory from '../rules/DroppedFramesHistory'; import ThroughputHistory from '../rules/ThroughputHistory'; import Debug from '../../core/Debug'; import {HTTPRequest} from '../vo/metrics/HTTPRequest'; import {checkInteger} from '../utils/SupervisorTools'; import MediaPlayerEvents from '../MediaPlayerEvents'; const DEFAULT_VIDEO_BITRATE = 1000; const DEFAULT_AUDIO_BITRATE = 100; const QUALITY_DEFAULT = 0; function AbrController() { const context = this.context; const debug = Debug(context).getInstance(); const eventBus = EventBus(context).getInstance(); let instance, logger, abrRulesCollection, streamController, topQualities, qualityDict, streamProcessorDict, abandonmentStateDict, abandonmentTimeout, windowResizeEventCalled, elementWidth, elementHeight, adapter, videoModel, mediaPlayerModel, customParametersModel, cmsdModel, domStorage, playbackIndex, switchHistoryDict, droppedFramesHistory, throughputHistory, isUsingBufferOccupancyAbrDict, isUsingL2AAbrDict, isUsingLoLPAbrDict, dashMetrics, settings; function setup() { logger = debug.getLogger(instance); resetInitialSettings(); } /** * Initialize everything that is not Stream specific. We only have one instance of the ABR Controller for all periods. */ function initialize() { droppedFramesHistory = DroppedFramesHistory(context).create(); throughputHistory = ThroughputHistory(context).create({ settings }); abrRulesCollection = ABRRulesCollection(context).create({ dashMetrics, customParametersModel, mediaPlayerModel, settings }); abrRulesCollection.initialize(); eventBus.on(MediaPlayerEvents.QUALITY_CHANGE_RENDERED, _onQualityChangeRendered, instance); eventBus.on(MediaPlayerEvents.METRIC_ADDED, _onMetricAdded, instance); eventBus.on(Events.LOADING_PROGRESS, _onFragmentLoadProgress, instance); } /** * Whenever a StreamProcessor is created it is added to the list of streamProcessorDict * In addition, the corresponding objects for this object and its stream id are created * @param {object} type * @param {object} streamProcessor */ function registerStreamType(type, streamProcessor) { const streamId = streamProcessor.getStreamInfo().id; if (!streamProcessorDict[streamId]) { streamProcessorDict[streamId] = {}; } if (!switchHistoryDict[streamId]) { switchHistoryDict[streamId] = {}; } if (!abandonmentStateDict[streamId]) { abandonmentStateDict[streamId] = {}; } switchHistoryDict[streamId][type] = SwitchRequestHistory(context).create(); streamProcessorDict[streamId][type] = streamProcessor; abandonmentStateDict[streamId][type] = {}; abandonmentStateDict[streamId][type].state = MetricsConstants.ALLOW_LOAD; _initializeAbrStrategy(type); if (type === Constants.VIDEO) { setElementSize(); } } function _initializeAbrStrategy(type) { const strategy = settings.get().streaming.abr.ABRStrategy; if (strategy === Constants.ABR_STRATEGY_L2A) { isUsingBufferOccupancyAbrDict[type] = false; isUsingLoLPAbrDict[type] = false; isUsingL2AAbrDict[type] = true; } else if (strategy === Constants.ABR_STRATEGY_LoLP) { isUsingBufferOccupancyAbrDict[type] = false; isUsingLoLPAbrDict[type] = true; isUsingL2AAbrDict[type] = false; } else if (strategy === Constants.ABR_STRATEGY_BOLA) { isUsingBufferOccupancyAbrDict[type] = true; isUsingLoLPAbrDict[type] = false; isUsingL2AAbrDict[type] = false; } else if (strategy === Constants.ABR_STRATEGY_THROUGHPUT) { isUsingBufferOccupancyAbrDict[type] = false; isUsingLoLPAbrDict[type] = false; isUsingL2AAbrDict[type] = false; } else if (strategy === Constants.ABR_STRATEGY_DYNAMIC) { isUsingBufferOccupancyAbrDict[type] = isUsingBufferOccupancyAbrDict && isUsingBufferOccupancyAbrDict[type] ? isUsingBufferOccupancyAbrDict[type] : false; isUsingLoLPAbrDict[type] = false; isUsingL2AAbrDict[type] = false; } } function unRegisterStreamType(streamId, type) { try { if (streamProcessorDict[streamId] && streamProcessorDict[streamId][type]) { delete streamProcessorDict[streamId][type]; } if (switchHistoryDict[streamId] && switchHistoryDict[streamId][type]) { delete switchHistoryDict[streamId][type]; } if (abandonmentStateDict[streamId] && abandonmentStateDict[streamId][type]) { delete abandonmentStateDict[streamId][type]; } } catch (e) { } } function resetInitialSettings() { topQualities = {}; qualityDict = {}; abandonmentStateDict = {}; streamProcessorDict = {}; switchHistoryDict = {}; isUsingBufferOccupancyAbrDict = {}; isUsingL2AAbrDict = {}; isUsingLoLPAbrDict = {}; if (windowResizeEventCalled === undefined) { windowResizeEventCalled = false; } if (droppedFramesHistory) { droppedFramesHistory.reset(); } playbackIndex = undefined; droppedFramesHistory = undefined; throughputHistory = undefined; clearTimeout(abandonmentTimeout); abandonmentTimeout = null; } function reset() { resetInitialSettings(); eventBus.off(Events.LOADING_PROGRESS, _onFragmentLoadProgress, instance); eventBus.off(MediaPlayerEvents.QUALITY_CHANGE_RENDERED, _onQualityChangeRendered, instance); eventBus.off(MediaPlayerEvents.METRIC_ADDED, _onMetricAdded, instance); if (abrRulesCollection) { abrRulesCollection.reset(); } } function setConfig(config) { if (!config) return; if (config.streamController) { streamController = config.streamController; } if (config.domStorage) { domStorage = config.domStorage; } if (config.mediaPlayerModel) { mediaPlayerModel = config.mediaPlayerModel; } if (config.customParametersModel) { customParametersModel = config.customParametersModel; } if (config.cmsdModel) { cmsdModel = config.cmsdModel } if (config.dashMetrics) { dashMetrics = config.dashMetrics; } if (config.adapter) { adapter = config.adapter; } if (config.videoModel) { videoModel = config.videoModel; } if (config.settings) { settings = config.settings; } } function checkConfig() { if (!domStorage || !domStorage.hasOwnProperty('getSavedBitrateSettings')) { throw new Error(Constants.MISSING_CONFIG_ERROR); } } /** * While fragment loading is in progress we check if we might need to abort the request * @param {object} e * @private */ function _onFragmentLoadProgress(e) { const type = e.request.mediaType; const streamId = e.streamId; if (!type || !streamId || !streamProcessorDict[streamId] || !settings.get().streaming.abr.autoSwitchBitrate[type]) { return; } const streamProcessor = streamProcessorDict[streamId][type]; if (!streamProcessor) { return; } const rulesContext = RulesContext(context).create({ abrController: instance, streamProcessor: streamProcessor, currentRequest: e.request, useBufferOccupancyABR: isUsingBufferOccupancyAbrDict[type], useL2AABR: isUsingL2AAbrDict[type], useLoLPABR: isUsingLoLPAbrDict[type], videoModel }); const switchRequest = abrRulesCollection.shouldAbandonFragment(rulesContext, streamId); if (switchRequest.quality > SwitchRequest.NO_CHANGE) { const fragmentModel = streamProcessor.getFragmentModel(); const request = fragmentModel.getRequests({ state: FragmentModel.FRAGMENT_MODEL_LOADING, index: e.request.index })[0]; if (request) { abandonmentStateDict[streamId][type].state = MetricsConstants.ABANDON_LOAD; switchHistoryDict[streamId][type].reset(); switchHistoryDict[streamId][type].push({ oldValue: getQualityFor(type, streamId), newValue: switchRequest.quality, confidence: 1, reason: switchRequest.reason }); setPlaybackQuality(type, streamController.getActiveStreamInfo(), switchRequest.quality, switchRequest.reason); clearTimeout(abandonmentTimeout); abandonmentTimeout = setTimeout( () => { abandonmentStateDict[streamId][type].state = MetricsConstants.ALLOW_LOAD; abandonmentTimeout = null; }, settings.get().streaming.abandonLoadTimeout ); } } } /** * Update dropped frames history when the quality was changed * @param {object} e * @private */ function _onQualityChangeRendered(e) { if (e.mediaType === Constants.VIDEO) { if (playbackIndex !== undefined) { droppedFramesHistory.push(e.streamId, playbackIndex, videoModel.getPlaybackQuality()); } playbackIndex = e.newQuality; } } /** * When the buffer level is updated we check if we need to change the ABR strategy * @param e * @private */ function _onMetricAdded(e) { if (e.metric === MetricsConstants.HTTP_REQUEST && e.value && e.value.type === HTTPRequest.MEDIA_SEGMENT_TYPE && (e.mediaType === Constants.AUDIO || e.mediaType === Constants.VIDEO)) { throughputHistory.push(e.mediaType, e.value, settings.get().streaming.abr.useDeadTimeLatency); } if (e.metric === MetricsConstants.BUFFER_LEVEL && (e.mediaType === Constants.AUDIO || e.mediaType === Constants.VIDEO)) { _updateAbrStrategy(e.mediaType, 0.001 * e.value.level); } } /** * Returns the highest possible index taking limitations like maxBitrate, representationRatio and portal size into account. * @param {string} type * @param {string} streamId * @return {undefined|number} */ function getMaxAllowedIndexFor(type, streamId) { try { let idx; topQualities[streamId] = topQualities[streamId] || {}; if (!topQualities[streamId].hasOwnProperty(type)) { topQualities[streamId][type] = 0; } idx = _checkMaxBitrate(type, streamId); idx = _checkMaxRepresentationRatio(idx, type, streamId); idx = _checkPortalSize(idx, type, streamId); // Apply maximum suggested bitrate from CMSD headers if enabled if (settings.get().streaming.cmsd.enabled && settings.get().streaming.cmsd.abr.applyMb) { idx = _checkCmsdMaxBitrate(idx, type, streamId); } return idx; } catch (e) { return undefined } } /** * Returns the minimum allowed index. We consider thresholds defined in the settings, i.e. minBitrate for the corresponding media type. * @param {string} type * @param {string} streamId * @return {undefined|number} */ function getMinAllowedIndexFor(type, streamId) { try { return _getMinIndexBasedOnBitrateFor(type, streamId); } catch (e) { return undefined } } /** * Returns the maximum allowed index. * @param {string} type * @param {string} streamId * @return {undefined|number} */ function _getMaxIndexBasedOnBitrateFor(type, streamId) { try { const maxBitrate = mediaPlayerModel.getAbrBitrateParameter('maxBitrate', type); if (maxBitrate > -1) { return getQualityForBitrate(streamProcessorDict[streamId][type].getMediaInfo(), maxBitrate, streamId); } else { return undefined; } } catch (e) { return undefined } } /** * Returns the minimum allowed index. * @param {string} type * @param {string} streamId * @return {undefined|number} */ function _getMinIndexBasedOnBitrateFor(type, streamId) { try { const minBitrate = mediaPlayerModel.getAbrBitrateParameter('minBitrate', type); if (minBitrate > -1) { const mediaInfo = streamProcessorDict[streamId][type].getMediaInfo(); const bitrateList = getBitrateList(mediaInfo); // This returns the quality index <= for the given bitrate let minIdx = getQualityForBitrate(mediaInfo, minBitrate, streamId); if (bitrateList[minIdx] && minIdx < bitrateList.length - 1 && bitrateList[minIdx].bitrate < minBitrate * 1000) { minIdx++; // Go to the next bitrate } return minIdx; } else { return undefined; } } catch (e) { return undefined; } } /** * Returns the maximum possible index * @param type * @param streamId * @return {number|*} */ function _checkMaxBitrate(type, streamId) { let idx = topQualities[streamId][type]; let newIdx = idx; if (!streamProcessorDict[streamId] || !streamProcessorDict[streamId][type]) { return newIdx; } const minIdx = getMinAllowedIndexFor(type, streamId); if (minIdx !== undefined) { newIdx = Math.max(idx, minIdx); } const maxIdx = _getMaxIndexBasedOnBitrateFor(type, streamId); if (maxIdx !== undefined) { newIdx = Math.min(newIdx, maxIdx); } return newIdx; } /** * Returns the maximum possible index from CMSD model * @param type * @param streamId * @return {number|*} */ function _checkCmsdMaxBitrate(idx, type, streamId) { // Check CMSD max suggested bitrate only for video segments if (type !== 'video') { return idx; } // Get max suggested bitrate let maxCmsdBitrate = cmsdModel.getMaxBitrate(type); if (maxCmsdBitrate < 0) { return idx; } // Substract audio bitrate const audioBitrate = _getBitrateInfoForQuality(streamId, 'audio', getQualityFor('audio', streamId)); maxCmsdBitrate -= audioBitrate ? (audioBitrate.bitrate / 1000) : 0; const maxIdx = getQualityForBitrate(streamProcessorDict[streamId][type].getMediaInfo(), maxCmsdBitrate, streamId); logger.debug('Stream ID: ' + streamId + ' [' + type + '] Apply max bit rate from CMSD: ' + maxCmsdBitrate); return Math.min(idx, maxIdx); } /** * Returns the maximum index according to maximum representation ratio * @param idx * @param type * @param streamId * @return {number|*} * @private */ function _checkMaxRepresentationRatio(idx, type, streamId) { let maxIdx = topQualities[streamId][type] const maxRepresentationRatio = settings.get().streaming.abr.maxRepresentationRatio[type]; if (isNaN(maxRepresentationRatio) || maxRepresentationRatio >= 1 || maxRepresentationRatio < 0) { return idx; } return Math.min(idx, Math.round(maxIdx * maxRepresentationRatio)); } /** * Returns the maximum index according to the portal size * @param idx * @param type * @param streamId * @return {number|*} * @private */ function _checkPortalSize(idx, type, streamId) { if (type !== Constants.VIDEO || !settings.get().streaming.abr.limitBitrateByPortal || !streamProcessorDict[streamId] || !streamProcessorDict[streamId][type]) { return idx; } if (!windowResizeEventCalled) { setElementSize(); } const streamInfo = streamProcessorDict[streamId][type].getStreamInfo(); const representation = adapter.getAdaptationForType(streamInfo.index, type, streamInfo).Representation_asArray; let newIdx = idx; if (elementWidth > 0 && elementHeight > 0) { while ( newIdx > 0 && representation[newIdx] && elementWidth < representation[newIdx].width && elementWidth - representation[newIdx - 1].width < representation[newIdx].width - elementWidth) { newIdx = newIdx - 1; } // Make sure that in case of multiple representation elements have same // resolution, every such element is included while (newIdx < representation.length - 1 && representation[newIdx].width === representation[newIdx + 1].width) { newIdx = newIdx + 1; } } return newIdx; } /** * Gets top BitrateInfo for the player * @param {string} type - 'video' or 'audio' are the type options. * @param {string} streamId - Id of the stream * @returns {BitrateInfo | null} */ function getTopBitrateInfoFor(type, streamId = null) { if (!streamId) { streamId = streamController.getActiveStreamInfo().id; } if (type && streamProcessorDict && streamProcessorDict[streamId] && streamProcessorDict[streamId][type]) { const idx = getMaxAllowedIndexFor(type, streamId); const bitrates = getBitrateList(streamProcessorDict[streamId][type].getMediaInfo()); return bitrates[idx] ? bitrates[idx] : null; } return null; } /** * Returns the initial bitrate for a specific media type and stream id * @param {string} type * @param {string} streamId * @returns {number} A value of the initial bitrate, kbps * @memberof AbrController# */ function getInitialBitrateFor(type, streamId) { checkConfig(); if (type === Constants.TEXT) { return NaN; } const savedBitrate = domStorage.getSavedBitrateSettings(type); let configBitrate = mediaPlayerModel.getAbrBitrateParameter('initialBitrate', type); let configRatio = settings.get().streaming.abr.initialRepresentationRatio[type]; if (configBitrate === -1) { if (configRatio > -1) { const streamInfo = streamProcessorDict[streamId][type].getStreamInfo(); const representation = adapter.getAdaptationForType(streamInfo.index, type, streamInfo).Representation_asArray; if (Array.isArray(representation)) { const repIdx = Math.max(Math.round(representation.length * configRatio) - 1, 0); configBitrate = representation[repIdx].bandwidth / 1000; } else { configBitrate = 0; } } else if (!isNaN(savedBitrate)) { configBitrate = savedBitrate; } else { configBitrate = (type === Constants.VIDEO) ? DEFAULT_VIDEO_BITRATE : DEFAULT_AUDIO_BITRATE; } } return configBitrate; } /** * This function is called by the scheduleControllers to check if the quality should be changed. * Consider this the main entry point for the ABR decision logic * @param {string} type * @param {string} streamId */ function checkPlaybackQuality(type, streamId) { try { if (!type || !streamProcessorDict || !streamProcessorDict[streamId] || !streamProcessorDict[streamId][type]) { return false; } if (droppedFramesHistory) { const playbackQuality = videoModel.getPlaybackQuality(); if (playbackQuality) { droppedFramesHistory.push(streamId, playbackIndex, playbackQuality); } } // ABR is turned off, do nothing if (!settings.get().streaming.abr.autoSwitchBitrate[type]) { return false; } const oldQuality = getQualityFor(type, streamId); const rulesContext = RulesContext(context).create({ abrController: instance, switchHistory: switchHistoryDict[streamId][type], droppedFramesHistory: droppedFramesHistory, streamProcessor: streamProcessorDict[streamId][type], currentValue: oldQuality, useBufferOccupancyABR: isUsingBufferOccupancyAbrDict[type], useL2AABR: isUsingL2AAbrDict[type], useLoLPABR: isUsingLoLPAbrDict[type], videoModel }); const minIdx = getMinAllowedIndexFor(type, streamId); const maxIdx = getMaxAllowedIndexFor(type, streamId); const switchRequest = abrRulesCollection.getMaxQuality(rulesContext); let newQuality = switchRequest.quality; if (minIdx !== undefined && ((newQuality > SwitchRequest.NO_CHANGE) ? newQuality : oldQuality) < minIdx) { newQuality = minIdx; } if (newQuality > maxIdx) { newQuality = maxIdx; } switchHistoryDict[streamId][type].push({ oldValue: oldQuality, newValue: newQuality }); if (newQuality > SwitchRequest.NO_CHANGE && newQuality !== oldQuality && (abandonmentStateDict[streamId][type].state === MetricsConstants.ALLOW_LOAD || newQuality < oldQuality)) { _changeQuality(type, oldQuality, newQuality, maxIdx, switchRequest.reason, streamId); return true; } return false; } catch (e) { return false; } } /** * Returns the current quality for a specific media type and a specific streamId * @param {string} type * @param {string} streamId * @return {number|*} */ function getQualityFor(type, streamId = null) { try { if (!streamId) { streamId = streamController.getActiveStreamInfo().id; } if (type && streamProcessorDict[streamId] && streamProcessorDict[streamId][type]) { let quality; if (streamId) { qualityDict[streamId] = qualityDict[streamId] || {}; if (!qualityDict[streamId].hasOwnProperty(type)) { qualityDict[streamId][type] = QUALITY_DEFAULT; } quality = qualityDict[streamId][type]; return quality; } } return QUALITY_DEFAULT; } catch (e) { return QUALITY_DEFAULT; } } /** * Sets the new playback quality. Starts from index 0. * If the index of the new quality is the same as the old one changeQuality will not be called. * @param {string} type * @param {object} streamInfo * @param {number} newQuality * @param {string} reason */ function setPlaybackQuality(type, streamInfo, newQuality, reason = null) { if (!streamInfo || !streamInfo.id || !type) { return; } const streamId = streamInfo.id; const oldQuality = getQualityFor(type, streamId); checkInteger(newQuality); const topQualityIdx = getMaxAllowedIndexFor(type, streamId); if (newQuality !== oldQuality && newQuality >= 0 && newQuality <= topQualityIdx) { _changeQuality(type, oldQuality, newQuality, topQualityIdx, reason, streamId); } } /** * * @param {string} streamId * @param {type} type * @return {*|null} */ function getAbandonmentStateFor(streamId, type) { return abandonmentStateDict[streamId] && abandonmentStateDict[streamId][type] ? abandonmentStateDict[streamId][type].state : null; } /** * Changes the internal qualityDict values according to the new quality * @param {string} type * @param {number} oldQuality * @param {number} newQuality * @param {number} maxIdx * @param {string} reason * @param {object} streamId * @private */ function _changeQuality(type, oldQuality, newQuality, maxIdx, reason, streamId) { if (type && streamProcessorDict[streamId] && streamProcessorDict[streamId][type]) { const streamInfo = streamProcessorDict[streamId][type].getStreamInfo(); const isDynamic = streamInfo && streamInfo.manifestInfo && streamInfo.manifestInfo.isDynamic; const bufferLevel = dashMetrics.getCurrentBufferLevel(type); logger.info('Stream ID: ' + streamId + ' [' + type + '] switch from ' + oldQuality + ' to ' + newQuality + '/' + maxIdx + ' (buffer: ' + bufferLevel + ') ' + (reason ? JSON.stringify(reason) : '.')); qualityDict[streamId] = qualityDict[streamId] || {}; qualityDict[streamId][type] = newQuality; const bitrateInfo = _getBitrateInfoForQuality(streamId, type, newQuality); eventBus.trigger(Events.QUALITY_CHANGE_REQUESTED, { oldQuality, newQuality, reason, streamInfo, bitrateInfo, maxIdx, mediaType: type }, { streamId: streamInfo.id, mediaType: type } ); const bitrate = throughputHistory.getAverageThroughput(type, isDynamic); if (!isNaN(bitrate)) { domStorage.setSavedBitrateSettings(type, bitrate); } } } function _getBitrateInfoForQuality(streamId, type, idx) { if (type && streamProcessorDict && streamProcessorDict[streamId] && streamProcessorDict[streamId][type]) { const bitrates = getBitrateList(streamProcessorDict[streamId][type].getMediaInfo()); return bitrates[idx] ? bitrates[idx] : null; } return null; } /** * @param {MediaInfo} mediaInfo * @param {number} bitrate A bitrate value, kbps * @param {String} streamId Period ID * @param {number|n