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import { Part } from './fragment';
import type { Fragment } from './fragment';
import type { AttrList } from '../utils/attr-list';
import type { DateRange } from './date-range';
import type { VariableMap } from '../types/level';
const DEFAULT_TARGET_DURATION = 10;
/**
* Object representing parsed data from an HLS Media Playlist. Found in {@link hls.js#Level.details}.
*/
export class LevelDetails {
public PTSKnown: boolean = false;
public alignedSliding: boolean = false;
public averagetargetduration?: number;
public endCC: number = 0;
public endSN: number = 0;
public fragments: Fragment[];
public fragmentHint?: Fragment;
public partList: Part[] | null = null;
public dateRanges: Record<string, DateRange>;
public live: boolean = true;
public ageHeader: number = 0;
public advancedDateTime?: number;
public updated: boolean = true;
public advanced: boolean = true;
public availabilityDelay?: number; // Manifest reload synchronization
public misses: number = 0;
public startCC: number = 0;
public startSN: number = 0;
public startTimeOffset: number | null = null;
public targetduration: number = 0;
public totalduration: number = 0;
public type: string | null = null;
public url: string;
public m3u8: string = '';
public version: number | null = null;
public canBlockReload: boolean = false;
public canSkipUntil: number = 0;
public canSkipDateRanges: boolean = false;
public skippedSegments: number = 0;
public recentlyRemovedDateranges?: string[];
public partHoldBack: number = 0;
public holdBack: number = 0;
public partTarget: number = 0;
public preloadHint?: AttrList;
public renditionReports?: AttrList[];
public tuneInGoal: number = 0;
public deltaUpdateFailed?: boolean;
public driftStartTime: number = 0;
public driftEndTime: number = 0;
public driftStart: number = 0;
public driftEnd: number = 0;
public encryptedFragments: Fragment[];
public playlistParsingError: Error | null = null;
public variableList: VariableMap | null = null;
public hasVariableRefs = false;
constructor(baseUrl) {
this.fragments = [];
this.encryptedFragments = [];
this.dateRanges = {};
this.url = baseUrl;
}
reloaded(previous: LevelDetails | undefined) {
if (!previous) {
this.advanced = true;
this.updated = true;
return;
}
const partSnDiff = this.lastPartSn - previous.lastPartSn;
const partIndexDiff = this.lastPartIndex - previous.lastPartIndex;
this.updated =
this.endSN !== previous.endSN ||
!!partIndexDiff ||
!!partSnDiff ||
!this.live;
this.advanced =
this.endSN > previous.endSN ||
partSnDiff > 0 ||
(partSnDiff === 0 && partIndexDiff > 0);
if (this.updated || this.advanced) {
this.misses = Math.floor(previous.misses * 0.6);
} else {
this.misses = previous.misses + 1;
}
this.availabilityDelay = previous.availabilityDelay;
}
get hasProgramDateTime(): boolean {
if (this.fragments.length) {
return Number.isFinite(
this.fragments[this.fragments.length - 1].programDateTime as number
);
}
return false;
}
get levelTargetDuration(): number {
return (
this.averagetargetduration ||
this.targetduration ||
DEFAULT_TARGET_DURATION
);
}
get drift(): number {
const runTime = this.driftEndTime - this.driftStartTime;
if (runTime > 0) {
const runDuration = this.driftEnd - this.driftStart;
return (runDuration * 1000) / runTime;
}
return 1;
}
get edge(): number {
return this.partEnd || this.fragmentEnd;
}
get partEnd(): number {
if (this.partList?.length) {
return this.partList[this.partList.length - 1].end;
}
return this.fragmentEnd;
}
get fragmentEnd(): number {
if (this.fragments?.length) {
return this.fragments[this.fragments.length - 1].end;
}
return 0;
}
get age(): number {
if (this.advancedDateTime) {
return Math.max(Date.now() - this.advancedDateTime, 0) / 1000;
}
return 0;
}
get lastPartIndex(): number {
if (this.partList?.length) {
return this.partList[this.partList.length - 1].index;
}
return -1;
}
get lastPartSn(): number {
if (this.partList?.length) {
return this.partList[this.partList.length - 1].fragment.sn as number;
}
return this.endSN;
}
}