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| 1 | +import { Events } from '../events'; |
| 2 | +import { Logger } from '../utils/logger'; |
| 3 | +import { parseMediaFragment } from '../utils/media-fragment-parser'; |
| 4 | +import type Hls from '../hls'; |
| 5 | +import type { ComponentAPI } from '../types/component-api'; |
| 6 | +import type { |
| 7 | + ManifestLoadingData, |
| 8 | + MediaAttachingData, |
| 9 | + MediaDetachingData, |
| 10 | +} from '../types/events'; |
| 11 | + |
| 12 | +/** |
| 13 | + * MediaFragmentController |
| 14 | + * |
| 15 | + * Handles W3C Media Fragments URI temporal dimension (#t=start,end). |
| 16 | + * - Parses fragment from URL |
| 17 | + * - Sets start position |
| 18 | + * - Pauses at end time (one-time) |
| 19 | + * - Removes listeners after pause |
| 20 | + */ |
| 21 | +export default class MediaFragmentController |
| 22 | + extends Logger |
| 23 | + implements ComponentAPI |
| 24 | +{ |
| 25 | + private hls: Hls; |
| 26 | + private media: HTMLMediaElement | null = null; |
| 27 | + private fragmentEnd: number | null = null; |
| 28 | + private endReached: boolean = false; |
| 29 | + private _boundOnTimeUpdate: () => void; |
| 30 | + private _boundOnSeeked: () => void; |
| 31 | + |
| 32 | + constructor(hls: Hls) { |
| 33 | + super('media-fragment', hls.logger); |
| 34 | + this.hls = hls; |
| 35 | + this._boundOnTimeUpdate = this.onTimeUpdate.bind(this); |
| 36 | + this._boundOnSeeked = this.onSeeked.bind(this); |
| 37 | + this.registerListeners(); |
| 38 | + } |
| 39 | + |
| 40 | + private registerListeners() { |
| 41 | + const { hls } = this; |
| 42 | + hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this); |
| 43 | + hls.on(Events.MEDIA_ATTACHING, this.onMediaAttaching, this); |
| 44 | + hls.on(Events.MEDIA_DETACHING, this.onMediaDetaching, this); |
| 45 | + } |
| 46 | + |
| 47 | + private unregisterListeners() { |
| 48 | + const { hls } = this; |
| 49 | + hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this); |
| 50 | + hls.off(Events.MEDIA_ATTACHING, this.onMediaAttaching, this); |
| 51 | + hls.off(Events.MEDIA_DETACHING, this.onMediaDetaching, this); |
| 52 | + } |
| 53 | + |
| 54 | + private onManifestLoading( |
| 55 | + event: Events.MANIFEST_LOADING, |
| 56 | + data: ManifestLoadingData, |
| 57 | + ) { |
| 58 | + if (!data.url.includes('#')) { |
| 59 | + return; |
| 60 | + } |
| 61 | + const { temporalFragment } = parseMediaFragment(data.url); |
| 62 | + this.fragmentEnd = null; |
| 63 | + this.endReached = false; |
| 64 | + this.detachMediaListeners(); |
| 65 | + if (temporalFragment) { |
| 66 | + if (temporalFragment.start !== undefined) { |
| 67 | + this.hls.config.startPosition = temporalFragment.start; |
| 68 | + } |
| 69 | + this.fragmentEnd = temporalFragment.end ?? null; |
| 70 | + this.hls.trigger(Events.MEDIA_FRAGMENT_PARSED, { |
| 71 | + start: temporalFragment.start, |
| 72 | + end: temporalFragment.end, |
| 73 | + }); |
| 74 | + if (this.media && this.fragmentEnd !== null) { |
| 75 | + this.attachMediaListeners(); |
| 76 | + } |
| 77 | + } |
| 78 | + } |
| 79 | + |
| 80 | + private onMediaAttaching( |
| 81 | + event: Events.MEDIA_ATTACHING, |
| 82 | + data: MediaAttachingData, |
| 83 | + ) { |
| 84 | + this.media = data.media; |
| 85 | + if (this.fragmentEnd !== null && !this.endReached) { |
| 86 | + this.attachMediaListeners(); |
| 87 | + } |
| 88 | + } |
| 89 | + |
| 90 | + private onMediaDetaching( |
| 91 | + event: Events.MEDIA_DETACHING, |
| 92 | + data: MediaDetachingData, |
| 93 | + ) { |
| 94 | + this.detachMediaListeners(); |
| 95 | + this.media = null; |
| 96 | + } |
| 97 | + |
| 98 | + private attachMediaListeners() { |
| 99 | + if (!this.media) { |
| 100 | + return; |
| 101 | + } |
| 102 | + this.media.addEventListener('timeupdate', this._boundOnTimeUpdate); |
| 103 | + this.media.addEventListener('seeked', this._boundOnSeeked); |
| 104 | + } |
| 105 | + |
| 106 | + private detachMediaListeners() { |
| 107 | + if (this.media) { |
| 108 | + this.media.removeEventListener('timeupdate', this._boundOnTimeUpdate); |
| 109 | + this.media.removeEventListener('seeked', this._boundOnSeeked); |
| 110 | + } |
| 111 | + } |
| 112 | + |
| 113 | + private onTimeUpdate() { |
| 114 | + this.checkFragmentEnd(); |
| 115 | + } |
| 116 | + |
| 117 | + private onSeeked() { |
| 118 | + const { media } = this; |
| 119 | + if (media) { |
| 120 | + this.checkFragmentEnd(media.currentTime); |
| 121 | + } |
| 122 | + } |
| 123 | + |
| 124 | + private checkFragmentEnd(seekTime?: number) { |
| 125 | + const { media, fragmentEnd, endReached } = this; |
| 126 | + if (!media || fragmentEnd === null || endReached) { |
| 127 | + return; |
| 128 | + } |
| 129 | + const time = seekTime ?? media.currentTime; |
| 130 | + if (time >= fragmentEnd && (!media.paused || seekTime !== undefined)) { |
| 131 | + this.log( |
| 132 | + `Reached media fragment end at ${time.toFixed(3)} (end: ${fragmentEnd.toFixed(3)})`, |
| 133 | + ); |
| 134 | + this.endReached = true; |
| 135 | + media.pause(); |
| 136 | + this.detachMediaListeners(); |
| 137 | + this.hls.trigger(Events.MEDIA_FRAGMENT_END, {}); |
| 138 | + } |
| 139 | + } |
| 140 | + |
| 141 | + destroy() { |
| 142 | + this.unregisterListeners(); |
| 143 | + this.detachMediaListeners(); |
| 144 | + this.media = null; |
| 145 | + // @ts-ignore |
| 146 | + this.hls = null; |
| 147 | + } |
| 148 | +} |
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