video

node_modules/hls.js/src/loader/level-details.ts

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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: string) {
+    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;
+  }
+}