import chai from 'chai'; import sinon from 'sinon'; import sinonChai from 'sinon-chai'; import AudioStreamController from '../../../src/controller/audio-stream-controller'; import { Events } from '../../../src/events'; import Hls from '../../../src/hls'; import { Fragment, Part } from '../../../src/loader/fragment'; import { LevelDetails } from '../../../src/loader/level-details'; import { LoadStats } from '../../../src/loader/load-stats'; import M3U8Parser from '../../../src/loader/m3u8-parser'; import { Level } from '../../../src/types/level'; import { PlaylistLevelType } from '../../../src/types/loader'; import { AttrList } from '../../../src/utils/attr-list'; import { addSliding, adjustSliding, computeReloadInterval, mapFragmentIntersection, mapPartIntersection, mergeDetails, } from '../../../src/utils/level-helper'; import { logger } from '../../../src/utils/logger'; import type { MediaFragment } from '../../../src/loader/fragment'; import type { ComponentAPI, NetworkComponentAPI, } from '../../../src/types/component-api'; import type { AudioPlaylistType, MediaAttributes, MediaPlaylist, } from '../../../src/types/media-playlist'; chai.use(sinonChai); chai.config.truncateThreshold = 0; const expect = chai.expect; type HlsTestable = Omit & { coreComponents: ComponentAPI[]; networkControllers: NetworkComponentAPI[]; }; const generatePlaylist = (sequenceNumbers, offset = 0, duration = 5) => { const playlist = new LevelDetails(''); playlist.startSN = sequenceNumbers[0]; playlist.endSN = sequenceNumbers[sequenceNumbers.length - 1]; playlist.targetduration = duration + 1; playlist.averagetargetduration = duration; playlist.fragments = sequenceNumbers.map((n, i) => { const frag = new Fragment(PlaylistLevelType.MAIN, ''); frag.sn = n; frag.setStart(i * 5 + offset); frag.duration = duration; return frag; }); return playlist; }; const getIteratedSequence = (oldPlaylist, newPlaylist) => { const actual: number[] = []; mapFragmentIntersection(oldPlaylist, newPlaylist, (oldFrag, newFrag) => { if (oldFrag.sn !== newFrag.sn) { throw new Error('Expected old frag and new frag to have the same SN'); } actual.push(newFrag.sn as number); }); return actual; }; const getFragmentSequenceNumbers = (details: LevelDetails) => details.fragments .map((f: MediaFragment | null) => `${f?.sn}-${f?.cc}`) .join(','); describe('LevelHelper Tests', function () { let sandbox; beforeEach(function () { sandbox = sinon.createSandbox(); }); afterEach(function () { sandbox.restore(); }); describe('mapSegmentIntersection', function () { it('iterates over the intersection of the fragment arrays', function () { const oldPlaylist = generatePlaylist([1, 2, 3, 4, 5]); const newPlaylist = generatePlaylist([3, 4, 5, 6, 7]); const actual = getIteratedSequence(oldPlaylist, newPlaylist); expect(actual).to.deep.equal([3, 4, 5]); }); it('can iterate with one overlapping fragment', function () { const oldPlaylist = generatePlaylist([1, 2, 3, 4, 5]); const newPlaylist = generatePlaylist([5, 6, 7, 8, 9]); const actual = getIteratedSequence(oldPlaylist, newPlaylist); expect(actual).to.deep.equal([5]); }); it('can iterate over the entire segment array', function () { const oldPlaylist = generatePlaylist([1, 2, 3]); const newPlaylist = generatePlaylist([1, 2, 3]); const actual = getIteratedSequence(oldPlaylist, newPlaylist); expect(actual).to.deep.equal([1, 2, 3]); }); it('can iterate when overlapping happens at the start of the old playlist', function () { const oldPlaylist = generatePlaylist([5, 6, 7, 8]); const newPlaylist = generatePlaylist([3, 4, 5, 6]); const actual = getIteratedSequence(oldPlaylist, newPlaylist); expect(actual).to.deep.equal([5, 6]); }); it('never executes the callback if no intersection exists', function () { const oldPlaylist = generatePlaylist([1, 2, 3, 4, 5]); const newPlaylist = generatePlaylist([10, 11, 12]); const actual = getIteratedSequence(oldPlaylist, newPlaylist); expect(actual).to.deep.equal([]); }); }); describe('mapPartIntersection', function () { it('finds overlapping parts and executes callback for each', function () { const oldFrags = generatePlaylist([1, 2, 3]).fragments; const newFrags = generatePlaylist([2, 3, 4]).fragments; const attr = new AttrList('DURATION=1'); const oldParts: Part[] = [ new Part(attr, oldFrags[1], '', 0), new Part(attr, oldFrags[1], '', 1), new Part(attr, oldFrags[1], '', 2), new Part(attr, oldFrags[2], '', 0), new Part(attr, oldFrags[2], '', 1), new Part(attr, oldFrags[2], '', 2), ]; const newParts: Part[] = [ new Part(attr, newFrags[1], '', 0), new Part(attr, newFrags[1], '', 1), new Part(attr, newFrags[1], '', 2), new Part(attr, newFrags[2], '', 0), new Part(attr, newFrags[2], '', 1), new Part(attr, newFrags[2], '', 2), ]; const intersectionFn = sinon.spy(); mapPartIntersection(oldParts, newParts, intersectionFn); expect(intersectionFn).to.have.been.calledThrice; expect(intersectionFn.firstCall).to.have.been.calledWith( oldParts[3], newParts[0], ); expect(intersectionFn.secondCall).to.have.been.calledWith( oldParts[4], newParts[1], ); expect(intersectionFn.thirdCall).to.have.been.calledWith( oldParts[5], newParts[2], ); }); }); describe('adjustSliding', function () { // generatePlaylist creates fragments with a duration of 5 seconds it('adds the start time of the first comment segment to all other segment', function () { const oldPlaylist = generatePlaylist([1, 2, 3]); // start times: 0, 5, 10 const newPlaylist = generatePlaylist([3, 4, 5]); adjustSliding(oldPlaylist, newPlaylist); const actual = newPlaylist.fragments.map((f) => f.start); expect(actual).to.deep.equal([10, 15, 20]); }); it('applies expected sliding when no common segments exist', function () { const oldPlaylist = generatePlaylist([1, 2, 3]); const newPlaylist = generatePlaylist([5, 6, 7]); adjustSliding(oldPlaylist, newPlaylist); const actual = newPlaylist.fragments.map((f) => f.start); expect(actual).to.deep.equal([20, 25, 30]); }); it('applies minimal sliding when segments meet but do not overlap', function () { const oldPlaylist = generatePlaylist([1, 2, 3]); const newPlaylist = generatePlaylist([4, 5, 6]); adjustSliding(oldPlaylist, newPlaylist); const actual = newPlaylist.fragments.map((f) => f.start); expect(actual).to.deep.equal([15, 20, 25]); }); }); describe('mergeDetails', function () { it('transfers start times where segments overlap, and extrapolates the start of any new segment', function () { const oldPlaylist = generatePlaylist([1, 2, 3, 4]); // start times: 0, 5, 10, 15 const newPlaylist = generatePlaylist([2, 3, 4, 5]); mergeDetails(oldPlaylist, newPlaylist, logger); const actual = newPlaylist.fragments.map((f) => f.start); expect(actual).to.deep.equal([5, 10, 15, 20]); expect(newPlaylist.playlistParsingError).to.be.null; }); it('applies expected sliding when there is no segment overlap', function () { const oldPlaylist = generatePlaylist([1, 2, 3]); const newPlaylist = generatePlaylist([5, 6, 7]); mergeDetails(oldPlaylist, newPlaylist, logger); const actual = newPlaylist.fragments.map((f) => f.start); expect(actual).to.deep.equal([20, 25, 30]); expect(newPlaylist.playlistParsingError).to.be.null; }); it('matches start when the new playlist starts before the old', function () { const oldPlaylist = generatePlaylist([3, 4, 5]); oldPlaylist.fragments.forEach((f) => { f.addStart(10); }); const newPlaylist = generatePlaylist([1, 2, 3]); mergeDetails(oldPlaylist, newPlaylist, logger); const actual = newPlaylist.fragments.map((f) => f.start); expect(actual).to.deep.equal([10, 15, 20]); expect(newPlaylist.playlistParsingError).to.be.null; }); it('merges delta playlist updates', function () { const oldPlaylist = generatePlaylist([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]); const newPlaylist = generatePlaylist([10, 11, 12]); newPlaylist.skippedSegments = 7; newPlaylist.startSN = 3; // @ts-ignore newPlaylist.fragments.unshift(null, null, null, null, null, null, null); const merged = generatePlaylist([3, 4, 5, 6, 7, 8, 9, 10, 11, 12], 10); mergeDetails(oldPlaylist, newPlaylist, logger); expect(newPlaylist.deltaUpdateFailed).to.equal(false); expect(newPlaylist.fragments.length).to.equal(merged.fragments.length); newPlaylist.fragments.forEach((frag, i) => { expect( frag, `Fragment sn: ${frag.sn} does not match expected: actual: ${JSON.stringify(frag)} expect: ${JSON.stringify(merged.fragments[i])}`, ).to.deep.equal(merged.fragments[i]); }); expect(newPlaylist.playlistParsingError).to.be.null; }); it('marks failed delta playlist updates', function () { const oldPlaylist = generatePlaylist([1, 2, 3, 4, 5, 6, 7, 8]); const newPlaylist = generatePlaylist([10, 11, 12]); newPlaylist.skippedSegments = 5; newPlaylist.startSN = 5; // @ts-ignore newPlaylist.fragments.unshift(null, null, null, null, null); // FIXME: An expected offset of 50 would be preferred, but there is nothing to sync playlist start with const merged = generatePlaylist([10, 11, 12], 0); mergeDetails(oldPlaylist, newPlaylist, logger); expect(newPlaylist.deltaUpdateFailed).to.equal(true); expect(newPlaylist.fragments.length).to.equal(3); newPlaylist.fragments.forEach((frag, i) => { expect( frag, `Fragment sn: ${frag.sn} does not match expected: actual: ${JSON.stringify(frag)} expect: ${JSON.stringify(merged.fragments[i])}`, ).to.deep.equal(merged.fragments[i]); }); expect(newPlaylist.playlistParsingError).to.be.null; }); it('merges initSegments', function () { const oldPlaylist = generatePlaylist([1, 2, 3]); const oldInitSegment = new Fragment(PlaylistLevelType.MAIN, ''); oldInitSegment.sn = 'initSegment'; oldInitSegment.relurl = 'init.mp4'; oldPlaylist.fragments.forEach((frag) => { frag.initSegment = oldInitSegment; }); oldPlaylist.fragmentHint = new Fragment( PlaylistLevelType.MAIN, '', ) as MediaFragment; oldPlaylist.fragmentHint.sn = 4; oldPlaylist.fragmentHint.initSegment = oldInitSegment; const newPlaylist = generatePlaylist([2, 3, 4]); const newInitSegment = new Fragment(PlaylistLevelType.MAIN, ''); newInitSegment.sn = 'initSegment'; newInitSegment.relurl = 'init.mp4'; newPlaylist.fragments.forEach((frag) => { frag.initSegment = newInitSegment; }); newPlaylist.fragmentHint = new Fragment( PlaylistLevelType.MAIN, '', ) as MediaFragment; newPlaylist.fragmentHint.sn = 5; newPlaylist.fragmentHint.initSegment = newInitSegment; mergeDetails(oldPlaylist, newPlaylist, logger); newPlaylist.fragments.forEach((frag, i) => { expect( frag.initSegment, `Fragment sn: ${frag.sn} does not have correct initSegment`, ).to.equal(oldInitSegment); }); expect( newPlaylist.fragmentHint.initSegment, 'fragmentHint does not have correct initSegment', ).to.equal(oldInitSegment); expect(newPlaylist.playlistParsingError).to.be.null; }); it('handles delta Playlist updates with merged program date time and skipped date ranges', function () { const playlist = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:9 #EXT-X-MEDIA-SEQUENCE:3 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=36.0,CAN-SKIP-DATERANGES=YES,CAN-BLOCK-RELOAD=YES,HOLDBACK=18,PART-HOLDBACK=3 #EXTINF:6, fileSequence3.ts #EXT-X-DATERANGE:ID="one",START-DATE="2024-02-29T12:00:04.000Z" #EXT-X-MAP:URI="map.ts\ #EXT-X-KEY:METHOD=SAMPLE-AES,URI="key.bin" #EXT-X-PROGRAM-DATE-TIME:2024-02-29T12:00:06.000Z #EXTINF:6, fileSequence4.ts #EXT-X-BITRATE:2000 #EXT-X-DISCONTINUITY #EXT-X-PROGRAM-DATE-TIME:2024-02-29T12:01:00.000Z #EXTINF:6, fileSequence5.ts #EXT-X-DATERANGE:ID="two",START-DATE="2024-02-29T12:00:10.000Z" #EXTINF:6, fileSequence6.ts #EXTINF:6, fileSequence7.ts #EXTINF:6, fileSequence8.ts #EXTINF:6, fileSequence9.ts #EXTINF:6, fileSequence10.ts #EXT-X-DATERANGE:ID="three",START-DATE="2024-02-29T12:01:04.000Z"`; const playlistUpdate = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:9 #EXT-X-MEDIA-SEQUENCE:4 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=36.0,CAN-SKIP-DATERANGES=YES,CAN-BLOCK-RELOAD=YES,HOLDBACK=18,PART-HOLDBACK=3 #EXT-X-SKIP:SKIPPED-SEGMENTS=3 #EXTINF:6, fileSequence7.ts #EXTINF:6, fileSequence8.ts #EXTINF:6, fileSequence9.ts #EXTINF:6, fileSequence10.ts #EXT-X-DATERANGE:ID="three",START-DATE="2024-02-29T12:01:04.000Z" #EXTINF:6, fileSequence11.ts #EXT-X-DATERANGE:ID="four",START-DATE="2024-02-29T12:02:04.000Z"`; const details = parseLevelPlaylist(playlist); const detailsUpdated = parseLevelPlaylist(playlistUpdate); mergeDetails(details, detailsUpdated, logger); expect(details.hasProgramDateTime, 'details.hasProgramDateTime').to.be .true; expect(details.dateRanges, 'one') .to.have.property('one') .which.has.property('tagAnchor') .which.equals(details.fragments[1].ref) .which.has.property('sn') .which.equals(4); expect(details.dateRanges, 'two') .to.have.property('two') .which.has.property('tagAnchor') .which.equals(details.fragments[1].ref) .which.has.property('sn') .which.equals(4); expect(details.dateRanges, 'three') .to.have.property('three') .which.has.property('tagAnchor') .which.equals(details.fragments[2].ref) .which.has.property('sn') .which.equals(5); expect(details.dateRanges.one!.startTime).to.equal(4); expect(details.dateRanges.two!.startTime).to.equal(10); expect(details.dateRanges.three!.startTime).to.equal(16); expect(details.dateRanges.one!.tagOrder, 'one.tagOrder').to.equal(0); expect(details.dateRanges.two!.tagOrder, 'two.tagOrder').to.equal(1); expect(details.dateRanges.three!.tagOrder, 'three.tagOrder').to.equal(2); expect( detailsUpdated.hasProgramDateTime, 'detailsUpdated.hasProgramDateTime', ).to.be.true; expect(detailsUpdated.dateRanges, 'one updated') .to.have.property('one') .which.has.property('tagAnchor') .which.equals(detailsUpdated.fragments[0].ref) .which.has.property('sn') .which.equals(4); expect(detailsUpdated.dateRanges, 'two updated') .to.have.property('two') .which.has.property('tagAnchor') .which.equals(detailsUpdated.fragments[0].ref) .which.has.property('sn') .which.equals(4); expect(detailsUpdated.dateRanges, 'three updated') .to.have.property('three') .which.has.property('tagAnchor') .which.equals(detailsUpdated.fragments[1].ref) .which.has.property('sn') .which.equals(5); expect(detailsUpdated.dateRanges, 'four') .to.have.property('four') .which.has.property('tagAnchor') .which.has.property('sn') .which.equals(5); expect(detailsUpdated.dateRanges.one!.startTime).to.equal(4); expect(detailsUpdated.dateRanges.two!.startTime).to.equal(10); expect(detailsUpdated.dateRanges.three!.startTime).to.equal(16); expect(detailsUpdated.dateRanges.four!.startTime).to.equal(76); expect( detailsUpdated.dateRanges.one!.tagOrder, 'one.tagOrder updated', ).to.equal(0); expect( detailsUpdated.dateRanges.two!.tagOrder, 'two.tagOrder updated', ).to.equal(1); expect( detailsUpdated.dateRanges.three!.tagOrder, 'three.tagOrder updated', ).to.equal(2); expect( detailsUpdated.dateRanges.four!.tagOrder, 'four.tagOrder', ).to.equal(3); expect(detailsUpdated.playlistParsingError).to.be.null; }); it('handles delta Playlist updates with discontinuities', function () { const playlist = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:9 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=36 #EXT-X-MEDIA-SEQUENCE:0 #EXT-X-DISCONTINUITY-SEQUENCE:0 #EXTINF:6, fileSequence0.ts #EXTINF:6, fileSequence1.ts #EXT-X-DISCONTINUITY #EXTINF:6, fileSequence2.ts #EXTINF:6, fileSequence3.ts #EXTINF:6, fileSequence4.ts #EXTINF:6, fileSequence5.ts #EXTINF:6, fileSequence6.ts #EXTINF:6, fileSequence7.ts #EXTINF:6, fileSequence8.ts #EXTINF:6, fileSequence9.ts`; const deltaUpdate1 = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:9 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=36 #EXT-X-MEDIA-SEQUENCE:0 #EXT-X-DISCONTINUITY-SEQUENCE:0 #EXT-X-SKIP:SKIPPED-SEGMENTS=3 #EXTINF:6, fileSequence3.ts #EXTINF:6, fileSequence4.ts #EXTINF:6, fileSequence5.ts #EXTINF:6, fileSequence6.ts #EXTINF:6, fileSequence7.ts #EXTINF:6, fileSequence8.ts #EXTINF:6, fileSequence9.ts`; const deltaUpdate2 = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:9 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=36 #EXT-X-MEDIA-SEQUENCE:1 #EXT-X-DISCONTINUITY-SEQUENCE:0 #EXT-X-SKIP:SKIPPED-SEGMENTS=3 #EXTINF:6, fileSequence4.ts #EXTINF:6, fileSequence5.ts #EXTINF:6, fileSequence6.ts #EXTINF:6, fileSequence7.ts #EXTINF:6, fileSequence8.ts #EXTINF:6, fileSequence9.ts #EXTINF:6, fileSequence10.ts`; const deltaUpdate3 = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:9 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=36 #EXT-X-MEDIA-SEQUENCE:3 #EXT-X-DISCONTINUITY-SEQUENCE:1 #EXT-X-SKIP:SKIPPED-SEGMENTS=3 #EXTINF:6, fileSequence6.ts #EXTINF:6, fileSequence7.ts #EXTINF:6, fileSequence8.ts #EXTINF:6, fileSequence9.ts #EXTINF:6, fileSequence10.ts #EXTINF:6, fileSequence11.ts #EXT-X-DISCONTINUITY #EXTINF:6, fileSequence12.ts`; const details1 = parseLevelPlaylist(playlist); const details2 = parseLevelPlaylist(deltaUpdate1); const details3 = parseLevelPlaylist(deltaUpdate2); const details4 = parseLevelPlaylist(deltaUpdate3); expect(details1, 'details1').to.include({ live: true, canSkipUntil: 36, totalduration: 60, startSN: 0, endSN: 9, fragmentStart: 0, lastPartSn: 9, lastPartIndex: -1, fragmentHint: undefined, startCC: 0, endCC: 1, }); expect(details2, 'details2 before merging').to.include({ live: true, skippedSegments: 3, canSkipUntil: 36, totalduration: 60, startSN: 0, endSN: 9, lastPartSn: 9, lastPartIndex: -1, fragmentHint: undefined, startCC: 0, endCC: 0, // end CC reflects delta details until merged with previous }); expect(details2.fragments, 'details2 parsed fragments').to.have.lengthOf( 10, ); expect(details3, 'details3 before merging').to.include({ live: true, skippedSegments: 3, canSkipUntil: 36, totalduration: 60, startSN: 1, endSN: 10, lastPartSn: 10, lastPartIndex: -1, fragmentHint: undefined, startCC: 0, endCC: 0, // end CC reflects delta details until merged with previous }); expect(details3.fragments, 'details3 parsed fragments').to.have.lengthOf( 10, ); expect(details4, 'details4 before merging').to.include({ live: true, skippedSegments: 3, totalduration: 60, startSN: 3, endSN: 12, lastPartSn: 12, lastPartIndex: -1, fragmentHint: undefined, startCC: 1, endCC: 2, }); expect(details4.fragments, 'details4 parsed fragments').to.have.lengthOf( 10, ); // This delta update had no changes from the last (same end SN) details2.reloaded(details1); expect(details2, 'details2 reloaded').to.include({ misses: 1, advanced: false, updated: false, }); // discontinuity sequence numbers (frag.cc) should be carried over mergeDetails(details1, details2, logger); const mergedSequence1 = getFragmentSequenceNumbers(details2); expect( details2, `details2 merged with details1 (${mergedSequence1})`, ).to.include({ skippedSegments: 3, deltaUpdateFailed: false, startSN: 0, endSN: 9, startCC: 0, endCC: 1, }); expect(mergedSequence1).to.equal( '0-0,1-0,2-1,3-1,4-1,5-1,6-1,7-1,8-1,9-1', ); expect(details2.playlistParsingError).to.be.null; // This delta update added and removed one segment details3.reloaded(details2); expect(details3, 'details3 reloaded').to.include({ misses: 0, advanced: true, updated: true, }); // discontinuity sequence numbers (frag.cc) should be carried over mergeDetails(details2, details3, logger); const mergedSequence2 = getFragmentSequenceNumbers(details3); expect( details3, `details3 merged with details2 (${mergedSequence2})`, ).to.include({ skippedSegments: 3, deltaUpdateFailed: false, startSN: 1, endSN: 10, startCC: 0, endCC: 1, }); expect(mergedSequence2).to.equal( '1-0,2-1,3-1,4-1,5-1,6-1,7-1,8-1,9-1,10-1', ); expect(details3.playlistParsingError).to.be.null; // This delta update added and removed two segments with a discontinuity at the last segment details4.reloaded(details3); expect(details4, 'details4 reloaded').to.include({ misses: 0, advanced: true, updated: true, }); // discontinuity sequence numbers (frag.cc) should be carried over mergeDetails(details3, details4, logger); const mergedSequence3 = getFragmentSequenceNumbers(details4); expect( details4, `details4 merged with details3 (${mergedSequence3})`, ).to.include({ skippedSegments: 3, deltaUpdateFailed: false, startSN: 3, endSN: 12, startCC: 1, endCC: 2, }); expect(mergedSequence3).to.equal( '3-1,4-1,5-1,6-1,7-1,8-1,9-1,10-1,11-1,12-2', ); expect(details4.playlistParsingError).to.be.null; }); it('handles delta Playlist updates with discontinuities and parts', function () { const playlist = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:9 #EXT-X-SERVER-CONTROL:CAN-BLOCK-RELOAD=YES,CAN-SKIP-UNTIL=24,PART-HOLD-BACK=3.0 #EXT-X-MEDIA-SEQUENCE:101 #EXT-X-DISCONTINUITY-SEQUENCE:10 #EXTINF:6, fileSequence1.m4s #EXT-X-DISCONTINUITY #EXTINF:6, fileSequence2.m4s #EXTINF:6, fileSequence3.m4s #EXTINF:6, fileSequence4.m4s #EXTINF:6, fileSequence5.m4s #EXTINF:6, fileSequence6.m4s #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence7.1.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence7.2.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence7.3.m4s" #EXTINF:6, fileSequence7.m4s #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence8.1.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence8.2.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence8.3.m4s"`; const deltaUpdate = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:9 #EXT-X-SERVER-CONTROL:CAN-BLOCK-RELOAD=YES,CAN-SKIP-UNTIL=24,PART-HOLD-BACK=3.0 #EXT-X-MEDIA-SEQUENCE:102 #EXT-X-DISCONTINUITY-SEQUENCE:10 #EXT-X-DISCONTINUITY #EXT-X-SKIP:SKIPPED-SEGMENTS=4 #EXTINF:6, fileSequence6.m4s #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence7.1.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence7.2.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence7.3.m4s" #EXTINF:6, fileSequence7.m4s #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence8.1.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence8.2.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence8.3.m4s" #EXTINF:6, fileSequence8.m4s #EXT-X-DISCONTINUITY #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence9.1.m4s"`; const deltaUpdateIncrementDisco = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:9 #EXT-X-SERVER-CONTROL:CAN-BLOCK-RELOAD=YES,CAN-SKIP-UNTIL=24,PART-HOLD-BACK=3.0 #EXT-X-MEDIA-SEQUENCE:102 #EXT-X-DISCONTINUITY-SEQUENCE:11 #EXT-X-SKIP:SKIPPED-SEGMENTS=4 #EXTINF:6, fileSequence6.m4s #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence7.1.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence7.2.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence7.3.m4s" #EXTINF:6, fileSequence7.m4s #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence8.1.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence8.2.m4s" #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence8.3.m4s" #EXTINF:6, fileSequence8.m4s #EXT-X-DISCONTINUITY #EXT-X-PART:DURATION=2,URI="ll.m4s?segment=fileSequence9.1.m4s"`; const details1 = parseLevelPlaylist(playlist); const details2 = parseLevelPlaylist(deltaUpdate); const details3 = parseLevelPlaylist(deltaUpdateIncrementDisco); expect(details1, 'details1').to.include({ live: true, canSkipUntil: 24, totalduration: 48, startSN: 101, endSN: 107, fragmentStart: 0, lastPartSn: 108, lastPartIndex: 2, startCC: 10, endCC: 11, }); expect( details2, 'delta w/o disco seq incremented before merging', ).to.include({ live: true, skippedSegments: 4, canSkipUntil: 24, totalduration: 44, startSN: 102, endSN: 108, lastPartSn: 109, lastPartIndex: 0, startCC: 10, endCC: 12, }); expect( details2.fragments, 'delta w/o disco seq incremented fragments', ).to.have.lengthOf(7); expect( details3, 'delta w/ disco seq incremented before merging', ).to.include({ live: true, skippedSegments: 4, canSkipUntil: 24, totalduration: 44, startSN: 102, endSN: 108, lastPartSn: 109, lastPartIndex: 0, startCC: 11, // w/ disco-sequence incremented endCC: 12, // end CC reflects delta details until merged with previous }); expect( details3.fragments, 'delta w/ disco seq incremented fragments', ).to.have.lengthOf(7); // This delta update does not increment discontinuity-sequence (discontinuity tag would appear before first segment) details2.reloaded(details1); expect(details2, 'delta w/o disco seq incremented reloaded').to.include({ misses: 0, advanced: true, updated: true, }); // discontinuity sequence numbers (frag.cc) should be carried over mergeDetails(details1, details2, logger); const mergedSequence1 = getFragmentSequenceNumbers(details2); expect( details2, `delta w/o disco seq incremented merged (${mergedSequence1})`, ).to.include({ skippedSegments: 4, deltaUpdateFailed: false, startSN: 102, endSN: 108, startCC: 10, // w/o disco-sequence incremented endCC: 11, }); expect(details2.fragments[0]).to.include({ sn: 102, cc: 11 }); expect(details2.fragmentHint).to.include({ sn: 109, cc: 12 }); expect(mergedSequence1).to.equal( '102-11,103-11,104-11,105-11,106-11,107-11,108-11', ); expect(details2.playlistParsingError).to.be.null; // This delta update does not increment discontinuity-sequence (discontinuity tag would appear before first segment) details3.reloaded(details1); expect(details3, 'delta w/ disco seq incremented reloaded').to.include({ misses: 0, advanced: true, updated: true, }); // discontinuity sequence numbers (frag.cc) should be carried over mergeDetails(details1, details3, logger); const mergedSequence2 = getFragmentSequenceNumbers(details3); expect( details3, `delta w/ disco seq incremented merged (${mergedSequence2})`, ).to.include({ skippedSegments: 4, deltaUpdateFailed: false, startSN: 102, endSN: 108, startCC: 11, // w/ disco-sequence incremented endCC: 11, }); expect(details3.fragments[0]).to.include({ sn: 102, cc: 11 }); expect(details3.fragmentHint).to.include({ sn: 109, cc: 12 }); expect(mergedSequence2).to.equal( '102-11,103-11,104-11,105-11,106-11,107-11,108-11', ); expect(details3.playlistParsingError).to.be.null; }); it('handles delta Playlist updates with discontinuities and parts and no sequence change (missing PDT)', function () { const playlist = `#EXTM3U #EXT-X-VERSION:10 #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-TARGETDURATION:3 #EXT-X-SERVER-CONTROL:CAN-BLOCK-RELOAD=YES,PART-HOLD-BACK=3.126000,CAN-SKIP-UNTIL=20.0 #EXT-X-PART-INF:PART-TARGET=1.000000 #EXT-X-MEDIA-SEQUENCE:0 #EXT-X-DISCONTINUITY-SEQUENCE:0 #EXT-X-DATERANGE:ID="nmss-daterange",START-DATE="2025-05-22T07:59:38.809Z" #EXT-X-MAP:URI="720p_0_0.m4s" #EXTINF:2.500000, 720p_0.m4v #EXTINF:2.500000, 720p_1.m4v #EXTINF:2.500000, 720p_2.m4v #EXTINF:2.184667, #EXT-X-DISCONTINUITY #EXT-X-MAP:URI="720p_0_1.m4s #EXTINF:2.500000, 720p_3.m4v #EXTINF:2.500000, 720p_4.m4v #EXTINF:2.500000, 720p_5.m4v #EXTINF:2.500000, 720p_6.m4v #EXTINF:2.500000, 720p_7.m4v #EXTINF:2.500000, 720p_8.m4v #EXT-X-PART:DURATION=1.000000,URI="720p_9_0.m4v",INDEPENDENT=YES #EXT-X-PART:DURATION=1.000000,URI="720p_9_1.m4v" #EXT-X-PART:DURATION=0.500000,URI="720p_9_2.m4v" #EXTINF:2.500000, 720p_9.m4v #EXT-X-PART:DURATION=1.000000,URI="720p_10_0.m4v",INDEPENDENT=YES #EXT-X-PART:DURATION=1.000000,URI="720p_10_1.m4v" #EXT-X-PART:DURATION=0.500000,URI="720p_10_2.m4v" #EXTINF:2.500000, 720p_10.m4v #EXT-X-PART:DURATION=1.000000,URI="720p_11_0.m4v",INDEPENDENT=YES #EXT-X-PART:DURATION=1.000000,URI="720p_11_1.m4v" #EXT-X-PART:DURATION=0.500000,URI="720p_11_2.m4v" #EXTINF:2.500000, 720p_11.m4v #EXT-X-PART:DURATION=1.000000,URI="720p_12_0.m4v",INDEPENDENT=YES #EXT-X-PART:DURATION=1.000000,URI="720p_12_0.m4v" #EXT-X-PRELOAD-HINT:TYPE=PART,URI="720p_12_2.m4v"`; const deltaUpdate = `#EXTM3U #EXT-X-VERSION:10 #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-TARGETDURATION:3 #EXT-X-SERVER-CONTROL:CAN-BLOCK-RELOAD=YES,PART-HOLD-BACK=3.126000,CAN-SKIP-UNTIL=20.0 #EXT-X-PART-INF:PART-TARGET=1.000000 #EXT-X-MEDIA-SEQUENCE:0 #EXT-X-DISCONTINUITY-SEQUENCE:0 #EXT-X-DATERANGE:ID="nmss-daterange",START-DATE="2025-05-22T07:59:38.809Z" #EXT-X-SKIP:SKIPPED-SEGMENTS=4 #EXT-X-MAP:URI="720p_0_1.m4s" 720p_4.m4v #EXTINF:2.500000, 720p_5.m4v #EXTINF:2.500000, 720p_6.m4v #EXTINF:2.500000, 720p_7.m4v #EXTINF:2.500000, 720p_8.m4v #EXT-X-PART:DURATION=1.000000,URI="720p_9_0.m4v",INDEPENDENT=YES #EXT-X-PART:DURATION=1.000000,URI="720p_9_1.m4v" #EXT-X-PART:DURATION=0.500000,URI="720p_9_2.m4v" #EXTINF:2.500000, 720p_9.m4v #EXT-X-PART:DURATION=1.000000,URI="720p_10_0.m4v",INDEPENDENT=YES #EXT-X-PART:DURATION=1.000000,URI="720p_10_1.m4v" #EXT-X-PART:DURATION=0.500000,URI="720p_10_2.m4v" #EXTINF:2.500000, 720p_10.m4v #EXT-X-PART:DURATION=1.000000,URI="720p_11_0.m4v",INDEPENDENT=YES #EXT-X-PART:DURATION=1.000000,URI="720p_11_1.m4v" #EXT-X-PART:DURATION=0.500000,URI="720p_11_2.m4v" #EXTINF:2.500000, 720p_11.m4v #EXT-X-PART:DURATION=1.000000,URI="720p_12_0.m4v",INDEPENDENT=YES #EXT-X-PART:DURATION=1.000000,URI="720p_12_0.m4v" #EXT-X-PART:DURATION=1.000000,URI="720p_12_0.m4v" #EXTINF:2.500000, 720p_12.m4v #EXT-X-PRELOAD-HINT:TYPE=PART,URI="720p_13_0.m4`; const details1 = parseLevelPlaylist(playlist); const details2 = parseLevelPlaylist(deltaUpdate); expect(details1, 'details1').to.include({ live: true, canSkipUntil: 20, totalduration: 32, startSN: 0, endSN: 11, fragmentStart: 0, lastPartSn: 12, lastPartIndex: 1, startCC: 0, endCC: 1, }); expect( details2, 'delta w/o disco seq incremented before merging', ).to.include({ live: true, skippedSegments: 4, canSkipUntil: 20, totalduration: 32, startSN: 0, endSN: 12, lastPartSn: 12, lastPartIndex: 2, startCC: 0, endCC: 0, // endCC of delta playlist will not be incremented until merged }); expect( details2.fragments, 'delta w/o disco seq incremented fragments', ).to.have.lengthOf(13); // This delta update does not increment discontinuity-sequence (discontinuity tag would appear before first segment) details2.reloaded(details1); expect(details2, 'delta w/o disco seq incremented reloaded').to.include({ misses: 0, advanced: true, updated: true, }); // discontinuity sequence numbers (frag.cc) should be carried over mergeDetails(details1, details2, logger); const mergedSequence1 = getFragmentSequenceNumbers(details2); expect( details2, `delta w/o disco seq incremented merged (${mergedSequence1})`, ).to.include({ skippedSegments: 4, deltaUpdateFailed: false, startSN: 0, endSN: 12, startCC: 0, endCC: 1, // incremented after merging }); expect(details2.fragmentHint).to.include({ sn: 13, cc: 1 }); expect(mergedSequence1).to.equal( '0-0,1-0,2-0,3-1,4-1,5-1,6-1,7-1,8-1,9-1,10-1,11-1,12-1', ); expect(details2.playlistParsingError).to.be.null; }); it('handles delta Playlist updates with multiple skip tags and removed date ranges', function () { const playlist = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:10 #EXT-X-MEDIA-SEQUENCE:3 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=36.0,CAN-SKIP-DATERANGES=YES,CAN-BLOCK-RELOAD=YES,HOLDBACK=18,PART-HOLDBACK=3 #EXT-X-PROGRAM-DATE-TIME:2019-04-29T19:52:19.060Z #EXT-X-DATERANGE:ID="d0",START-DATE="2019-04-29T19:52:20.000Z",DURATION=0 #EXT-X-DATERANGE:ID="d1",START-DATE="2019-04-29T19:52:21.000Z",DURATION=1 #EXT-X-DATERANGE:ID="d2",START-DATE="2019-04-29T19:52:22.000Z",DURATION=2 #EXT-X-DATERANGE:ID="d3",START-DATE="2019-04-29T19:52:23.000Z",DURATION=3 #EXT-X-DATERANGE:ID="d4",START-DATE="2019-04-29T19:52:24.000Z",DURATION=4 #EXTINF:6, fileSequence3.ts #EXTINF:6, fileSequence4.ts #EXTINF:6, fileSequence5.ts #EXTINF:6, fileSequence6.ts #EXTINF:6, fileSequence7.ts #EXTINF:6, fileSequence8.ts #EXTINF:6, fileSequence9.ts #EXTINF:6, fileSequence10.ts #EXTINF:6, fileSequence11.ts #EXTINF:6, fileSequence12.ts #EXTINF:6, fileSequence13.ts #EXTINF:6, fileSequence14.ts #EXTINF:6, fileSequence15.ts #EXTINF:6, fileSequence16.ts #EXTINF:6, fileSequence17.ts`; const playlistUpdate = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:10 #EXT-X-MEDIA-SEQUENCE:3 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=36.0,CAN-SKIP-DATERANGES=YES,CAN-BLOCK-RELOAD=YES,HOLDBACK=18,PART-HOLDBACK=3 #EXT-X-DATERANGE:ID="d3",START-DATE="2019-04-29T19:52:23.000Z",DURATION=3 #EXT-X-DATERANGE:ID="d5",START-DATE="2019-04-29T19:52:25.000Z",DURATION=5 #EXT-X-DATERANGE:ID="d6",START-DATE="2019-04-29T19:52:26.000Z",DURATION=6 #EXT-X-SKIP:SKIPPED-SEGMENTS=2,RECENTLY-REMOVED-DATERANGES="d1 d4" #EXTINF:6, fileSequence5.ts #EXTINF:6, fileSequence6.ts #EXT-X-SKIP:SKIPPED-SEGMENTS=2,RECENTLY-REMOVED-DATERANGES="d0" #EXTINF:6, fileSequence9.ts #EXTINF:6, fileSequence10.ts #EXTINF:6, fileSequence11.ts #EXTINF:6, fileSequence12.ts #EXTINF:6, fileSequence13.ts #EXTINF:6, fileSequence14.ts #EXTINF:6, fileSequence15.ts #EXTINF:6, fileSequence16.ts #EXTINF:6, fileSequence17.ts #EXTINF:6, fileSequence18.ts`; const details = parseLevelPlaylist(playlist); const detailsUpdated = parseLevelPlaylist(playlistUpdate); mergeDetails(details, detailsUpdated, logger); expect(details.hasProgramDateTime, 'details.hasProgramDateTime').to.be .true; expect( Object.keys(details.dateRanges), 'first playlist daterange ids', ).to.have.deep.equal(['d0', 'd1', 'd2', 'd3', 'd4']); expect(details.dateRanges.d2!.startTime).to.equal(2.94); expect(details.dateRanges.d3!.startTime).to.equal(3.94); expect( detailsUpdated.hasProgramDateTime, 'detailsUpdated.hasProgramDateTime', ).to.be.true; expect( detailsUpdated.recentlyRemovedDateranges, 'removed daterange ids', ).to.deep.equal(['d1', 'd4', 'd0']); expect( Object.keys(detailsUpdated.dateRanges), 'delta playlist merged daterange ids', ).to.have.deep.equal(['d2', 'd3', 'd5', 'd6']); expect(detailsUpdated.dateRanges, 'd2 updated') .to.have.property('d2') .which.has.property('tagAnchor') .which.equals(detailsUpdated.fragments[0].ref) .which.has.property('sn') .which.equals(3); expect(detailsUpdated.dateRanges.d2!.startTime).to.equal(2.94); expect(detailsUpdated.dateRanges.d3!.startTime).to.equal(3.94); // Multiple #EXT-X-SKIP tags are not allowed expect(detailsUpdated.playlistParsingError).to.include({ message: `#EXT-X-SKIP must not appear more than once (#EXT-X-SKIP:SKIPPED-SEGMENTS=2,RECENTLY-REMOVED-DATERANGES="d0")`, }); }); it('does not add more sliding when LevelDetails arguments are the same object', function () { const playlist = `#EXTM3U #EXT-X-TARGETDURATION:6 #EXT-X-VERSION:10 #EXT-X-MEDIA-SEQUENCE:3 #EXTINF:6, fileSequence5.ts #EXTINF:6, fileSequence6.ts`; const details = parseLevelPlaylist(playlist); addSliding(details, 10); expect(details.fragmentStart).to.equal(10); mergeDetails(details, details, logger); expect(details.fragmentStart).to.equal(10); }); it('aligns discontinuities based on media sequence number', function () { const playlist1 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:2 #EXT-X-MEDIA-SEQUENCE:26 #EXT-X-MAP:URI="video_init.mp4" #EXTINF:2.000, video_26.m4s #EXT-X-DISCONTINUITY #EXTINF:2.000, video_27.m4s #EXT-X-DISCONTINUITY #EXTINF:2.000, video_28.m4s #EXT-X-DISCONTINUITY #EXTINF:2.000, video_29.m4s #EXTINF:2.000, video_30.m4s #EXT-X-DISCONTINUITY #EXTINF:2.000, video_31.m4s`; const playlist2 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:2 #EXT-X-MEDIA-SEQUENCE:28 #EXT-X-MAP:URI="video_init.mp4" #EXTINF:2.000, video_28.m4s #EXT-X-DISCONTINUITY #EXTINF:2.000, video_29.m4s #EXTINF:2.000, video_30.m4s #EXT-X-DISCONTINUITY #EXTINF:2.000, video_31.m4s #EXT-X-DISCONTINUITY #EXTINF:2.000, video_32.m4s`; const oldPlaylist = parseLevelPlaylist(playlist1); const newPlaylist = parseLevelPlaylist(playlist2); expect(oldPlaylist).to.include({ startSN: 26, startCC: 0, endCC: 4, }); expect(newPlaylist).to.include({ startSN: 28, startCC: 0, endCC: 3, }); mergeDetails(oldPlaylist, newPlaylist, logger); expect(newPlaylist.playlistParsingError).to.be.null; expect(newPlaylist).to.include({ startSN: 28, startCC: 1, endCC: 5, }); const mergedSequence = getFragmentSequenceNumbers(newPlaylist); expect(mergedSequence).to.equal('28-2,29-3,30-3,31-4,32-5'); }); it('aligns discontinuities based on media sequence number (#7163)', function () { const playlist1 = `#EXTM3U #EXT-X-VERSION:7 #EXT-X-TARGETDURATION:2 #EXT-X-MEDIA-SEQUENCE:0 #EXT-X-DISCONTINUITY #EXT-X-MAP:URI="getMP4InitFragment.mp4" #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:25.166Z #EXTINF:1.875, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821492057832144523283530704043374 #EXT-X-DISCONTINUITY #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:27.155Z #EXTINF:1.73, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821497009592301664805164162363767 #EXT-X-DISCONTINUITY #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:28.696Z #EXTINF:1.698, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821501961352458806326677392019605 #EXT-X-DISCONTINUITY #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:30.387Z #EXTINF:1.742, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821506913112615947848230969811191 #EXT-X-DISCONTINUITY #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:32.335Z #EXTINF:1.685, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821511864872773089369853347903342`; const playlist2 = `#EXTM3U #EXT-X-VERSION:7 #EXT-X-TARGETDURATION:2 #EXT-X-MEDIA-SEQUENCE:1 #EXT-X-DISCONTINUITY #EXT-X-MAP:URI="getMP4InitFragment.mp4" #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:27.155Z #EXTINF:1.73, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821497009592301664805164162363767 #EXT-X-DISCONTINUITY #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:28.696Z #EXTINF:1.698, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821501961352458806326677392019605 #EXT-X-DISCONTINUITY #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:30.387Z #EXTINF:1.742, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821506913112615947848230969811191 #EXT-X-DISCONTINUITY #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:32.335Z #EXTINF:1.685, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821511864872773089369853347903342 #EXT-X-DISCONTINUITY #EXT-X-PROGRAM-DATE-TIME:2025-04-08T14:20:33.806Z #EXTINF:1.677, getMP4MediaFragment.mp4?FragmentNumber=91343852333398821516816632930230891347979802607`; const oldPlaylist = parseLevelPlaylist(playlist1); const newPlaylist = parseLevelPlaylist(playlist2); expect(oldPlaylist).to.include({ startSN: 0, startCC: 0, endCC: 5, }); expect(newPlaylist).to.include({ startSN: 1, startCC: 0, endCC: 5, }); mergeDetails(oldPlaylist, newPlaylist, logger); expect(newPlaylist.playlistParsingError).to.be.null; expect(newPlaylist).to.include({ startSN: 1, startCC: 1, endCC: 6, }); const mergedSequence = getFragmentSequenceNumbers(newPlaylist); expect(mergedSequence).to.equal('1-2,2-3,3-4,4-5,5-6'); }); }); describe('computeReloadInterval', function () { let sandbox; beforeEach(function () { sandbox = sinon.createSandbox(); sandbox.stub(performance, 'now').returns(0); }); afterEach(function () { sandbox.restore(); }); it('returns the targetduration of the new level if available', function () { const newPlaylist = generatePlaylist([3, 4], 0, 6); newPlaylist.targetduration = 5; newPlaylist.updated = true; const actual = computeReloadInterval(newPlaylist); expect(actual).to.equal(5000); }); it('halves the reload interval if the playlist contains the same segments', function () { const newPlaylist = generatePlaylist([1, 2]); newPlaylist.updated = false; newPlaylist.targetduration = 5; const actual = computeReloadInterval(newPlaylist); expect(actual).to.equal(2500); }); it('rounds the reload interval', function () { const newPlaylist = generatePlaylist([3, 4], 0, 10); newPlaylist.targetduration = 5.9999; newPlaylist.updated = true; const actual = computeReloadInterval(newPlaylist); expect(actual).to.equal(6000); }); it('returns a minimum of half the target duration', function () { const newPlaylist = generatePlaylist([3, 4]); newPlaylist.targetduration = 5; newPlaylist.updated = false; const actual = computeReloadInterval(newPlaylist); expect(actual).to.equal(2500); }); it('returns the last fragment duration when distance to live edge is less than or equal to four target durations', function () { const newPlaylist = generatePlaylist([3, 4], 0, 2); newPlaylist.targetduration = 5; newPlaylist.updated = true; const actual = computeReloadInterval(newPlaylist, 20000); expect(actual).to.equal(5000); const actualLow = computeReloadInterval(newPlaylist, 14000); expect(actualLow).to.equal(2000); }); }); describe('main and alternate playlist alignment on live update with discontinuity', function () { const mainPlaylist_01 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5428 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-PROGRAM-DATE-TIME:2024-11-20T14:14:59.000Z #EXT-X-MAP:URI="video_init.mp4" #EXTINF:2.000, video_5428.m4s #EXTINF:2.000, video_5429.m4s #EXTINF:2.000, video_5430.m4s #EXTINF:2.000, video_5431.m4s #EXTINF:2.000, video_5432.m4s #EXTINF:2.000, video_5433.m4s #EXTINF:2.000, video_5434.m4s`; const mainPlaylist_02 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5438 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-PROGRAM-DATE-TIME:2024-11-20T14:15:53.000Z #EXT-X-MAP:URI="video_init.mp4" #EXT-X-DISCONTINUITY #EXTINF:2.033, video_5438.m4s #EXTINF:2.000, video_5439.m4s #EXTINF:2.000, video_5440.m4s #EXTINF:2.000, video_5441.m4s`; const audioPlaylist_01 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5428 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-PROGRAM-DATE-TIME:2024-11-20T14:14:58.500Z #EXT-X-MAP:URI="audio_init.mp4" #EXTINF:2.005, audio_5428.m4s #EXTINF:2.005, audio_5429.m4s #EXTINF:2.005, audio_5430.m4s #EXTINF:1.984, audio_5431.m4s #EXTINF:2.005, audio_5432.m4s #EXTINF:2.005, audio_5433.m4s #EXTINF:2.005, audio_5434.m4s #EXTINF:2.005, audio_5435.m4s`; const audioPlaylist_02 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5438 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-PROGRAM-DATE-TIME:2024-11-20T14:15:52.500Z #EXT-X-MAP:URI="audio_init.mp4" #EXT-X-DISCONTINUITY #EXTINF:0.619, audio_5438.m4s #EXTINF:1.984, audio_5439.m4s #EXTINF:2.005, audio_5440.m4s #EXTINF:2.005, audio_5441.m4s`; let hls: HlsTestable; let levelInfo: Level; let trackInfo: MediaPlaylist; let mainDetails1: LevelDetails; let mainDetails2: LevelDetails; let audioDetails1: LevelDetails; let audioDetails2: LevelDetails; beforeEach(function () { hls = new Hls({ // debug: true, }) as unknown as HlsTestable; for (let i = hls.networkControllers.length; i--; ) { const component = hls.networkControllers[i]; if ( component !== (hls as any).streamController && !(component instanceof AudioStreamController) ) { component.destroy(); hls.networkControllers.splice(i, 1); } } hls.coreComponents.forEach( (component) => component !== (hls as any).latencyController && component.destroy(), ); hls.coreComponents.length = 0; mainDetails1 = parseLevelPlaylist( mainPlaylist_01, 'http://example.com/playlist-v.m3u8', ); mainDetails2 = parseLevelPlaylist( mainPlaylist_02, 'http://example.com/playlist-v.m3u8', ); audioDetails1 = parseLevelPlaylist( audioPlaylist_01, 'http://example.com/playlist-a.m3u8', PlaylistLevelType.AUDIO, ); audioDetails2 = parseLevelPlaylist( audioPlaylist_02, 'http://example.com/playlist-a.m3u8', PlaylistLevelType.AUDIO, ); levelInfo = new Level({ attrs: new AttrList({}), bitrate: 0, details: mainDetails1, name: '', url: '', }); trackInfo = { attrs: new AttrList({}) as MediaAttributes, autoselect: true, bitrate: 0, default: true, forced: false, groupId: '', id: 0, name: '', type: 'AUDIO' as AudioPlaylistType, url: '', }; hls.trigger(Events.MANIFEST_PARSED, { levels: [levelInfo], audioTracks: [trackInfo], subtitleTracks: [], sessionData: null, sessionKeys: null, firstLevel: 0, stats: new LoadStats(), audio: true, video: true, altAudio: true, }); hls.trigger(Events.AUDIO_TRACKS_UPDATED, { audioTracks: [trackInfo] }); }); afterEach(function () { hls.destroy(); }); function levelLoaded(details: LevelDetails, levelInfo: Level) { hls.trigger(Events.LEVEL_LOADED, { details, levelInfo, level: 0, id: 0, stats: new LoadStats(), networkDetails: new Response('ok'), deliveryDirectives: null, }); } function audioTrackLoaded(details: LevelDetails, track: MediaPlaylist) { hls.trigger(Events.AUDIO_TRACK_LOADED, { details, track, id: 0, groupId: '', stats: new LoadStats(), networkDetails: new Response('ok'), deliveryDirectives: null, }); } it('aligns playlist on level update', function () { // First main and audio playlist responses levelLoaded(mainDetails1, levelInfo); audioTrackLoaded(audioDetails1, trackInfo); expect(mainDetails1.fragmentStart).to.equal(0); expect(audioDetails1.fragmentStart).to.equal(-0.5); expect(mainDetails1.totalduration).to.equal(14); expect(audioDetails1.totalduration).to.equal(16.019); // Seconds main and audio playlist responses mergeDetails(mainDetails1, mainDetails2, logger); mergeDetails(audioDetails1, audioDetails2, logger); expect(audioDetails2.alignedSliding).to.be.false; expect(mainDetails2.fragmentStart).to.equal(20.0825); expect(audioDetails2.fragmentStart).to.equal(16.0325); expect(mainDetails2.startCC).to.equal(31); expect(audioDetails2.startCC).to.equal(31); expect(mainDetails2.endCC).to.equal(32); expect(audioDetails2.endCC).to.equal(32); levelLoaded(mainDetails2, levelInfo); audioTrackLoaded(audioDetails2, trackInfo); expect(audioDetails2.alignedSliding).to.be.true; expect(mainDetails2.fragmentStart).to.equal(20.0825); expect(audioDetails2.fragmentStart).to.equal(20.0825); expect(mainDetails2.playlistParsingError).to.be.null; expect(audioDetails2.playlistParsingError).to.be.null; }); it('aligns playlist on track update', function () { // First main and audio playlist responses audioTrackLoaded(audioDetails1, trackInfo); levelLoaded(mainDetails1, levelInfo); expect(mainDetails1.fragmentStart).to.equal(0); expect(audioDetails1.fragmentStart).to.equal(-0.5); expect(mainDetails1.totalduration).to.equal(14); expect(audioDetails1.totalduration).to.equal(16.019); // Seconds main and audio playlist responses mergeDetails(mainDetails1, mainDetails2, logger); mergeDetails(audioDetails1, audioDetails2, logger); expect(audioDetails2.alignedSliding).to.be.false; expect(mainDetails2.fragmentStart).to.equal(20.0825); expect(audioDetails2.fragmentStart).to.equal(16.0325); audioTrackLoaded(audioDetails2, trackInfo); levelLoaded(mainDetails2, levelInfo); expect(audioDetails2.alignedSliding).to.be.true; expect(mainDetails2.fragmentStart).to.equal(20.0825); expect(audioDetails2.fragmentStart).to.equal(20.0825); expect(mainDetails2.playlistParsingError).to.be.null; expect(audioDetails2.playlistParsingError).to.be.null; }); }); describe('Live playlist update errors', function () { it('changes the discontinuity sequence of segment between updates', function () { const playlist1 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5428 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-MAP:URI="video_init.mp4" #EXTINF:2.000, video_5428.m4s #EXTINF:2.000, video_5429.m4s #EXTINF:2.000, video_5430.m4s #EXTINF:2.000, video_5431.m4s`; const playlist2 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5429 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-MAP:URI="video_init.mp4" #EXTINF:2.000, video_5429.m4s #EXTINF:2.000, video_5430.m4s #EXT-X-DISCONTINUITY #EXTINF:2.000, video_5431.m4s #EXTINF:2.000, video_5432.m4s`; const details1 = parseLevelPlaylist(playlist1); const details2 = parseLevelPlaylist(playlist2); mergeDetails(details1, details2, logger); expectPlaylistParsingError( details2, 'discontinuity sequence mismatch (31!=32)', ); }); it('changes the media sequence of segment between updates', function () { const playlist1 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5428 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-MAP:URI="video_init.mp4" #EXTINF:2.000, video_5428.m4s #EXTINF:2.000, video_5429.m4s #EXTINF:2.000, video_5430.m4s #EXTINF:2.000, video_5431.m4s`; // Media sequence increased by one but two segments removed. const playlist2 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5429 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-MAP:URI="video_init.mp4" #EXTINF:2.000, video_5430.m4s #EXTINF:2.000, video_5431.m4s #EXTINF:2.000, video_5431.m4s #EXTINF:2.000, video_5432.m4s`; const details1 = parseLevelPlaylist(playlist1); const details2 = parseLevelPlaylist(playlist2); mergeDetails(details1, details2, logger); expectPlaylistParsingError( details2, 'media sequence mismatch 5429: http://example.com/video_5430.m4s', ); }); }); it('does not error between updates when only the query part of the URI changes', function () { const playlist1 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5428 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-MAP:URI="video_init.mp4" #EXTINF:2.000, video_5428.m4s?t=1 #EXTINF:2.000, video_5429.m4s?t=1 #EXTINF:2.000, video_5430.m4s?t=1 #EXTINF:2.000, video_5431.m4s?t=1`; // Media sequence increased by one but two segments removed. const playlist2 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:3 #EXT-X-MEDIA-SEQUENCE:5429 #EXT-X-DISCONTINUITY-SEQUENCE:31 #EXT-X-MAP:URI="video_init.mp4" #EXTINF:2.000, video_5429.m4s?t=2 #EXTINF:2.000, video_5430.m4s?t=2 #EXTINF:2.000, video_5431.m4s?t=2 #EXTINF:2.000, video_5432.m4s?t=2`; const details1 = parseLevelPlaylist(playlist1); const details2 = parseLevelPlaylist(playlist2); details2.fragments[0].base.url += '?base=changed'; mergeDetails(details1, details2, logger); expect(details2.playlistParsingError).to.be.null; }); it('maps dateranges based on latest EXT-X-PROGRAM-DATE-TIME', function () { const playlist1 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-MEDIA-SEQUENCE:1 #EXT-X-TARGETDURATION:6 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=9,CAN-SKIP-DATERANGES=YES #EXT-X-DATERANGE:ID="D0",START-DATE="2025-08-06T15:59:59Z",DURATION=1 #EXT-X-DATERANGE:ID="D1",START-DATE="2025-08-06T16:00:00Z",DURATION=12,SCTE35-CMD=0x00000000 #EXT-X-MAP:URI="hls/20821722-video=2499968.m4s" #EXT-X-PROGRAM-DATE-TIME:2025-08-06T16:00:00Z #EXTINF:4.0, no desc 1.m4s #EXTINF:4.0, no desc 2.m4s #EXT-X-PROGRAM-DATE-TIME:2025-08-06T16:08:00Z #EXTINF:4.0, no desc 3.m4s #EXT-X-DATERANGE:ID="D2",START-DATE="2025-08-06T16:00:15Z",PLANNED-DURATION=12,SCTE35-OUT=0x00000000 #EXTINF:4.0, no desc 4.m4s #EXTINF:4.0, no desc 5.m4s #EXT-X-PROGRAM-DATE-TIME:2025-08-06T16:00:20Z #EXTINF:4.0, no desc 6.m4s #EXTINF:4.0, no desc 7.m4s #EXTINF:4.0, no desc 8.m4s #EXTINF:4.0, no desc 9.m4s`; // Media sequence increased by one but two segments removed. const playlist2 = `#EXTM3U #EXT-X-VERSION:10 #EXT-X-MEDIA-SEQUENCE:5 #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-TARGETDURATION:6 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=9,CAN-SKIP-DATERANGES=YES #EXT-X-SKIP:SKIPPED-SEGMENTS=4,RECENTLY-REMOVED-DATERANGES="D0" #EXTINF:4, no desc 9.m4s #EXTINF:4, no desc 10.m4s #EXT-X-DATERANGE:ID="D3",START-DATE="2025-08-06T16:00:59.100Z",DURATION=12,SCTE35-CMD=0x00000000`; const details1 = parseLevelPlaylist(playlist1); const details2 = parseLevelPlaylist(playlist2); expect(details1.playlistParsingError).to.be.null; expect(details2.playlistParsingError).to.be.null; // First playilst details expect(details1).to.include({ startSN: 1, endSN: 9, totalduration: 36, dateRangeTagCount: 3, }); expect(details1.dateRanges).to.have.keys(['D0', 'D1', 'D2']); expect(details1.dateRanges.D0).to.include({ startTime: -1, tagOrder: 0, }); expect(details1.dateRanges.D0?.tagAnchor).to.include({ sn: 1, }); expect(details1.dateRanges.D1).to.include({ startTime: 0, tagOrder: 1, }); expect(details1.dateRanges.D1?.tagAnchor).to.include({ sn: 1, // expected to change in details2 after `mergeDetails` when sn: 1 is removed }); expect(details1.dateRanges.D2).to.include({ startTime: 15, tagOrder: 2, }); expect(details1.dateRanges.D2?.tagAnchor).to.include({ sn: 6, }); // Merged delta playlist with EXT-X-PROGRAM-DATE-TIME removed and DateRange tagAnchors updated mergeDetails(details1, details2, logger); expect(details2).to.include({ startSN: 5, endSN: 10, totalduration: 24, dateRangeTagCount: 1, }); expect(details2.dateRanges).to.have.keys(['D1', 'D2', 'D3']); expect(details2.dateRanges.D1).to.include({ startTime: 0, tagOrder: 1, }); expect(details2.dateRanges.D1?.tagAnchor).to.include({ sn: 6, }); expect(details2.dateRanges.D2).to.include({ startTime: 15, tagOrder: 2, }); expect(details2.dateRanges.D2?.tagAnchor).to.include({ sn: 6, }); expect(details2.dateRanges.D3).to.include({ startTime: 59.1, tagOrder: 2, // Note: tagOrder: 3 is expected (following previous/skipped date-ranges), but not critical. }); expect(details2.dateRanges.D3?.tagAnchor).to.include({ sn: 6, }); }); it('merges new dateranges in delta updates with previous details containing no dateranges', function () { const playlist1 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-MEDIA-SEQUENCE:1 #EXT-X-TARGETDURATION:6 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=9,CAN-SKIP-DATERANGES=YES #EXT-X-MAP:URI="hls/20821722-video=2499968.m4s" #EXT-X-PROGRAM-DATE-TIME:2025-08-06T16:00:00Z #EXTINF:4.0, no desc 1.m4s #EXTINF:4.0, no desc 2.m4s #EXT-X-PROGRAM-DATE-TIME:2025-08-06T16:08:00Z #EXTINF:4.0, no desc 3.m4s #EXTINF:4.0, no desc 4.m4s #EXTINF:4.0, no desc 5.m4s #EXT-X-PROGRAM-DATE-TIME:2025-08-06T16:00:20Z #EXTINF:4.0, no desc 6.m4s #EXTINF:4.0, no desc 7.m4s #EXTINF:4.0, no desc 8.m4s #EXTINF:4.0, no desc 9.m4s`; // Media sequence increased by one but two segments removed. const playlist2 = `#EXTM3U #EXT-X-VERSION:10 #EXT-X-MEDIA-SEQUENCE:5 #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-TARGETDURATION:6 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=9,CAN-SKIP-DATERANGES=YES #EXT-X-SKIP:SKIPPED-SEGMENTS=4,RECENTLY-REMOVED-DATERANGES="D0" #EXTINF:4, no desc 9.m4s #EXTINF:4, no desc 10.m4s #EXT-X-DATERANGE:ID="D3",START-DATE="2025-08-06T16:00:59.100Z",DURATION=12,SCTE35-CMD=0x00000000`; const details1 = parseLevelPlaylist(playlist1); const details2 = parseLevelPlaylist(playlist2); expect(details1.playlistParsingError).to.be.null; expect(details2.playlistParsingError).to.be.null; // First playilst details expect(details1).to.include({ startSN: 1, endSN: 9, totalduration: 36, dateRangeTagCount: 0, }); expect(details1.dateRanges).to.be.empty; // Merged delta playlist mergeDetails(details1, details2, logger); expect(details2).to.include({ startSN: 5, endSN: 10, totalduration: 24, dateRangeTagCount: 1, }); expect(details2.dateRanges).to.have.keys(['D3']); expect(details2.dateRanges.D3).to.include({ startTime: 59.1, tagOrder: 0, }); expect(details2.dateRanges.D3?.tagAnchor, 'D3?.tagAnchor').to.include({ sn: 6, }); }); it('adds and removed dateranges in delta updates with previous details when all previous dateranges are removed', function () { const playlist1 = `#EXTM3U #EXT-X-VERSION:6 #EXT-X-MEDIA-SEQUENCE:1 #EXT-X-TARGETDURATION:6 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=9,CAN-SKIP-DATERANGES=YES #EXT-X-MAP:URI="hls/20821722-video=2499968.m4s" #EXT-X-PROGRAM-DATE-TIME:2025-08-06T16:00:00Z #EXTINF:4.0, no desc 1.m4s #EXTINF:4.0, no desc 2.m4s #EXTINF:4.0, no desc 3.m4s #EXTINF:4.0, no desc 4.m4s #EXTINF:4.0, no desc 5.m4s #EXTINF:4.0, no desc 6.m4s #EXTINF:4.0, no desc 7.m4s #EXTINF:4.0, no desc 8.m4s #EXTINF:4.0, no desc 9.m4s #EXT-X-DATERANGE:ID="D2",START-DATE="2025-08-06T16:00:15Z",PLANNED-DURATION=12,SCTE35-OUT=0x00000000`; // Media sequence increased by one but two segments removed. const playlist2 = `#EXTM3U #EXT-X-VERSION:10 #EXT-X-MEDIA-SEQUENCE:5 #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-TARGETDURATION:6 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=9,CAN-SKIP-DATERANGES=YES #EXT-X-SKIP:SKIPPED-SEGMENTS=4,RECENTLY-REMOVED-DATERANGES="D2" #EXTINF:4, no desc 9.m4s #EXTINF:4, no desc 10.m4s #EXT-X-DATERANGE:ID="D3",START-DATE="2025-08-06T16:00:59.100Z",DURATION=12,SCTE35-CMD=0x00000000`; const playlist3 = `#EXTM3U #EXT-X-VERSION:10 #EXT-X-MEDIA-SEQUENCE:6 #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-TARGETDURATION:6 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=9,CAN-SKIP-DATERANGES=YES #EXT-X-SKIP:SKIPPED-SEGMENTS=4,RECENTLY-REMOVED-DATERANGES="D2" #EXTINF:4, no desc 10.m4s #EXTINF:4, no desc 11.m4s #EXT-X-DATERANGE:ID="D3",START-DATE="2025-08-06T16:00:59.100Z",DURATION=12,SCTE35-CMD=0x00000000`; const playlist4 = `#EXTM3U #EXT-X-VERSION:10 #EXT-X-MEDIA-SEQUENCE:7 #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-TARGETDURATION:6 #EXT-X-SERVER-CONTROL:CAN-SKIP-UNTIL=9,CAN-SKIP-DATERANGES=YES #EXT-X-SKIP:SKIPPED-SEGMENTS=4,RECENTLY-REMOVED-DATERANGES="D2 D3" #EXTINF:4, no desc 11.m4s #EXTINF:4, no desc 12.m4s #EXT-X-DATERANGE:ID="D4",START-DATE="2025-08-06T16:01:09.100Z",DURATION=12,SCTE35-CMD=0x00000000`; const details1 = parseLevelPlaylist(playlist1); const details2 = parseLevelPlaylist(playlist2); const details3 = parseLevelPlaylist(playlist3); const details4 = parseLevelPlaylist(playlist4); expect(details1.playlistParsingError).to.be.null; expect(details2.playlistParsingError).to.be.null; expect(details3.playlistParsingError).to.be.null; expect(details4.playlistParsingError).to.be.null; // First playilst details expect(details1).to.include({ startSN: 1, endSN: 9, totalduration: 36, dateRangeTagCount: 1, }); expect(details1.dateRanges).to.have.keys(['D2']); // Merge delta playlist mergeDetails(details1, details2, logger); expect(details2).to.include({ startSN: 5, endSN: 10, totalduration: 24, dateRangeTagCount: 1, }); expect(details2.dateRanges).to.have.keys(['D3']); expect(details2.dateRanges.D3).to.include({ startTime: 59.1, tagOrder: 0, }); expect(details2.dateRanges.D3?.tagAnchor, 'D3?.tagAnchor').to.include({ sn: 1, }); // Merge next delta playlist mergeDetails(details2, details3, logger); expect(details3).to.include({ startSN: 6, endSN: 11, totalduration: 24, dateRangeTagCount: 1, }); expect(details3.dateRanges).to.have.keys(['D3']); expect(details3.dateRanges.D3).to.include({ startTime: 59.1, tagOrder: 0, }); // `tagAnchor` moved to last segment when no segments with `rawProgramDateTime` (#EXT-X-PROGRAM-DATE-TIME) remain expect(details3.dateRanges.D3?.tagAnchor, 'D3?.tagAnchor').to.include({ sn: 11, }); // Merge next delta playlist mergeDetails(details3, details4, logger); expect(details4).to.include({ startSN: 7, endSN: 12, totalduration: 24, dateRangeTagCount: 1, }); expect(details4.dateRanges).to.have.keys(['D4']); // `tagAnchor` not inherited in new daterange when no segments with `rawProgramDateTime` (#EXT-X-PROGRAM-DATE-TIME) remain expect(details4.dateRanges.D4?.tagAnchor, 'D4?.tagAnchor').to.include({ sn: 12, }); expect(details4.dateRanges.D4).to.include({ startTime: 69.1, tagOrder: 0, }); }); }); function parseLevelPlaylist( m3u8: string, url?: string, type?: PlaylistLevelType, ) { return M3U8Parser.parseLevelPlaylist( m3u8, url || 'http://example.com/playlist.m3u8', 0, type || PlaylistLevelType.MAIN, 0, null, ); } function expectPlaylistParsingError(object: any, message: string) { expect( object, object?.playlistParsingError ? undefined : 'playlistParsingError', ) .to.have.property('playlistParsingError') .which.is.an('Error') .which.has.property('message') .which.is.a('string') .which.satisfy( (msg: string) => msg.startsWith(message), `Expected error message to start with "${message}"`, ); }