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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| import { ChannelDB } from '@/db/ChannelDB.ts'; | ||
| import { StreamLineupItem } from '@/db/derived_types/StreamLineup.ts'; | ||
| import { StreamProgramCalculator } from '@/stream/StreamProgramCalculator.ts'; | ||
| import dayjs from '@/util/dayjs.ts'; | ||
| import NodeCache from 'node-cache'; | ||
| import util from 'node:util'; | ||
|
|
||
| const playlistFmtString = ```#EXTM3U | ||
| #EXT-X-VERSION:3 | ||
| #EXT-X-TARGETDURATION:10 | ||
| #EXT-X-MEDIA-SEQUENCE:%d | ||
| #EXT-X-DISCONTINUITY | ||
| #EXTINF:%d, | ||
| %s://%s/ffmpeg/stream/%s?index=%d%s | ||
| ```; | ||
|
|
||
| type CachedCurrentIndex = { | ||
| startTime: number; | ||
| index: number; | ||
| }; | ||
|
|
||
| export class HlsPlaylistCreator { | ||
| private static cache = new NodeCache({ | ||
| stdTTL: +dayjs.duration({ days: 1 }), | ||
| }); | ||
|
|
||
| constructor( | ||
| private channelDB: ChannelDB, | ||
| private streamProgramCalculator: StreamProgramCalculator, | ||
| ) {} | ||
|
|
||
| async createPlaylist(channelId: string, now: dayjs.Dayjs) { | ||
| const lineupItemResult = | ||
| await this.streamProgramCalculator.getCurrentLineupItem({ | ||
| channelId, | ||
| startTime: +now, | ||
| allowSkip: false, | ||
| }); | ||
|
|
||
| if (lineupItemResult.isFailure()) { | ||
| throw lineupItemResult.error; | ||
| } | ||
|
|
||
| const { lineupItem } = lineupItemResult.get(); | ||
|
|
||
| const currentIndex = this.getLineupItemIndex(channelId, lineupItem); | ||
|
|
||
| return util.format(playlistFmtString, currentIndex); | ||
| } | ||
|
|
||
| private getLineupItemIndex(channelId: string, lineupItem: StreamLineupItem) { | ||
| const cachedValue = | ||
| HlsPlaylistCreator.cache.get<CachedCurrentIndex>(channelId); | ||
| if (cachedValue && cachedValue.startTime === lineupItem.programBeginMs) { | ||
| return cachedValue.index; | ||
| } else if (cachedValue) { | ||
| HlsPlaylistCreator.cache.set<CachedCurrentIndex>(channelId, { | ||
| startTime: lineupItem.programBeginMs, | ||
| index: cachedValue.index + 1, | ||
| }); | ||
| return cachedValue.index + 1; | ||
| } else { | ||
| HlsPlaylistCreator.cache.set<CachedCurrentIndex>(channelId, { | ||
| startTime: lineupItem.programBeginMs, | ||
| index: 1, | ||
| }); | ||
| return 1; | ||
| } | ||
| } | ||
| } |
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