/
MediaPlayerModel.js
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/
MediaPlayerModel.js
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/**
* 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 UTCTiming from '../../dash/vo/UTCTiming';
import FactoryMaker from '../../core/FactoryMaker';
import Constants from '../constants/Constants';
import ABRRulesCollection from '../rules/abr/ABRRulesCollection';
import Settings from '../../core/Settings';
import {checkParameterType} from '../utils/SupervisorTools';
const DEFAULT_MIN_BUFFER_TIME = 12;
const DEFAULT_MIN_BUFFER_TIME_FAST_SWITCH = 20;
const DEFAULT_LOW_LATENCY_LIVE_DELAY = 3.0;
const LOW_LATENCY_REDUCTION_FACTOR = 10;
const LOW_LATENCY_MULTIPLY_FACTOR = 5;
const DEFAULT_LIVE_LATENCY_CATCHUP_THRESHOLD_FACTOR = 2;
const DEFAULT_XHR_WITH_CREDENTIALS = false;
function MediaPlayerModel() {
let instance,
UTCTimingSources,
xhrWithCredentials,
customABRRule;
const DEFAULT_UTC_TIMING_SOURCE = {
scheme: 'urn:mpeg:dash:utc:http-xsdate:2014',
value: 'http://time.akamai.com/?iso&ms'
};
const context = this.context;
const settings = Settings(context).getInstance();
function setup() {
UTCTimingSources = [];
xhrWithCredentials = {
default: DEFAULT_XHR_WITH_CREDENTIALS
};
customABRRule = [];
}
//TODO Should we use Object.define to have setters/getters? makes more readable code on other side.
function findABRCustomRuleIndex(rulename) {
let i;
for (i = 0; i < customABRRule.length; i++) {
if (customABRRule[i].rulename === rulename) {
return i;
}
}
return -1;
}
function getABRCustomRules() {
return customABRRule;
}
function addABRCustomRule(type, rulename, rule) {
if (typeof type !== 'string' || (type !== ABRRulesCollection.ABANDON_FRAGMENT_RULES && type !== ABRRulesCollection.QUALITY_SWITCH_RULES) ||
typeof rulename !== 'string') {
throw Constants.BAD_ARGUMENT_ERROR;
}
let index = findABRCustomRuleIndex(rulename);
if (index === -1) {
// add rule
customABRRule.push({
type: type,
rulename: rulename,
rule: rule
});
} else {
// update rule
customABRRule[index].type = type;
customABRRule[index].rule = rule;
}
}
function removeABRCustomRule(rulename) {
if (rulename) {
let index = findABRCustomRuleIndex(rulename);
//if no rulename custom rule has been found, do nothing
if (index !== -1) {
// remove rule
customABRRule.splice(index, 1);
}
} else {
//if no rulename is defined, remove all ABR custome rules
customABRRule = [];
}
}
function getStableBufferTime() {
if (settings.get().streaming.lowLatencyEnabled) {
return getLiveDelay() * 0.6;
}
const stableBufferTime = settings.get().streaming.stableBufferTime;
return stableBufferTime > -1 ? stableBufferTime : settings.get().streaming.fastSwitchEnabled ? DEFAULT_MIN_BUFFER_TIME_FAST_SWITCH : DEFAULT_MIN_BUFFER_TIME;
}
function getRetryAttemptsForType(type) {
const lowLatencyMultiplyFactor = !isNaN(settings.get().streaming.retryAttempts.lowLatencyMultiplyFactor) ? settings.get().streaming.retryAttempts.lowLatencyMultiplyFactor : LOW_LATENCY_MULTIPLY_FACTOR;
return settings.get().streaming.lowLatencyEnabled ? settings.get().streaming.retryAttempts[type] * lowLatencyMultiplyFactor : settings.get().streaming.retryAttempts[type];
}
function getRetryIntervalsForType(type) {
const lowLatencyReductionFactor = !isNaN(settings.get().streaming.retryIntervals.lowLatencyReductionFactor) ? settings.get().streaming.retryIntervals.lowLatencyReductionFactor : LOW_LATENCY_REDUCTION_FACTOR;
return settings.get().streaming.lowLatencyEnabled ? settings.get().streaming.retryIntervals[type] / lowLatencyReductionFactor : settings.get().streaming.retryIntervals[type];
}
function getLiveDelay() {
if (settings.get().streaming.lowLatencyEnabled) {
return settings.get().streaming.liveDelay || DEFAULT_LOW_LATENCY_LIVE_DELAY;
}
return settings.get().streaming.liveDelay;
}
function getLiveCatchupLatencyThreshold() {
try {
const liveCatchupLatencyThreshold = settings.get().streaming.liveCatchupLatencyThreshold;
if (liveCatchupLatencyThreshold !== null && !isNaN(liveCatchupLatencyThreshold)) {
return liveCatchupLatencyThreshold;
}
const liveDelay = getLiveDelay();
const liveCatchupMinDrift = settings.get().streaming.liveCatchUpMinDrift;
const maximumLiveDelay = !isNaN(liveDelay) && liveDelay ? !isNaN(liveCatchupMinDrift) ? settings.get().streaming.liveCatchUpMinDrift + getLiveDelay() : getLiveDelay() : NaN;
if (maximumLiveDelay && !isNaN(maximumLiveDelay)) {
return maximumLiveDelay * DEFAULT_LIVE_LATENCY_CATCHUP_THRESHOLD_FACTOR;
}
return NaN;
} catch (e) {
return NaN;
}
}
function addUTCTimingSource(schemeIdUri, value) {
removeUTCTimingSource(schemeIdUri, value); //check if it already exists and remove if so.
let vo = new UTCTiming();
vo.schemeIdUri = schemeIdUri;
vo.value = value;
UTCTimingSources.push(vo);
}
function getUTCTimingSources() {
return UTCTimingSources;
}
function removeUTCTimingSource(schemeIdUri, value) {
checkParameterType(schemeIdUri, 'string');
checkParameterType(value, 'string');
UTCTimingSources.forEach(function (obj, idx) {
if (obj.schemeIdUri === schemeIdUri && obj.value === value) {
UTCTimingSources.splice(idx, 1);
}
});
}
function clearDefaultUTCTimingSources() {
UTCTimingSources = [];
}
function restoreDefaultUTCTimingSources() {
addUTCTimingSource(DEFAULT_UTC_TIMING_SOURCE.scheme, DEFAULT_UTC_TIMING_SOURCE.value);
}
function setXHRWithCredentialsForType(type, value) {
if (!type) {
Object.keys(xhrWithCredentials).forEach(key => {
setXHRWithCredentialsForType(key, value);
});
} else {
xhrWithCredentials[type] = !!value;
}
}
function getXHRWithCredentialsForType(type) {
const useCreds = xhrWithCredentials[type];
return useCreds === undefined ? xhrWithCredentials.default : useCreds;
}
function getDefaultUtcTimingSource() {
return DEFAULT_UTC_TIMING_SOURCE;
}
function reset() {
//TODO need to figure out what props to persist across sessions and which to reset if any.
//setup();
}
instance = {
getABRCustomRules,
addABRCustomRule,
removeABRCustomRule,
getStableBufferTime,
getRetryAttemptsForType,
getRetryIntervalsForType,
getLiveDelay,
getLiveCatchupLatencyThreshold,
addUTCTimingSource,
removeUTCTimingSource,
getUTCTimingSources,
clearDefaultUTCTimingSources,
restoreDefaultUTCTimingSources,
setXHRWithCredentialsForType,
getXHRWithCredentialsForType,
getDefaultUtcTimingSource,
reset
};
setup();
return instance;
}
//TODO see if you can move this and not export and just getter to get default value.
MediaPlayerModel.__dashjs_factory_name = 'MediaPlayerModel';
export default FactoryMaker.getSingletonFactory(MediaPlayerModel);