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import React, {useEffect, useId, useRef, useState} from 'react'
import {View} from 'react-native'
import {AppBskyEmbedVideo} from '@atproto/api'
import Hls, {Events, FragChangedData, Fragment} from 'hls.js'
import {useNonReactiveCallback} from '#/lib/hooks/useNonReactiveCallback'
import {atoms as a} from '#/alf'
import {MediaInsetBorder} from '#/components/MediaInsetBorder'
import {Controls} from './web-controls/VideoControls'
export function VideoEmbedInnerWeb({
embed,
active,
setActive,
onScreen,
}: {
embed: AppBskyEmbedVideo.View
active: boolean
setActive: () => void
onScreen: boolean
}) {
const containerRef = useRef<HTMLDivElement>(null)
const videoRef = useRef<HTMLVideoElement>(null)
const [focused, setFocused] = useState(false)
const [hasSubtitleTrack, setHasSubtitleTrack] = useState(false)
const figId = useId()
// send error up to error boundary
const [error, setError] = useState<Error | null>(null)
if (error) {
throw error
}
const hlsRef = useHLS({
focused,
playlist: embed.playlist,
setHasSubtitleTrack,
setError,
videoRef,
})
return (
<View style={[a.flex_1, a.rounded_md, a.overflow_hidden]}>
<div ref={containerRef} style={{height: '100%', width: '100%'}}>
<figure style={{margin: 0, position: 'absolute', inset: 0}}>
<video
ref={videoRef}
poster={embed.thumbnail}
style={{width: '100%', height: '100%', objectFit: 'contain'}}
playsInline
preload="none"
muted={!focused}
aria-labelledby={embed.alt ? figId : undefined}
/>
{embed.alt && (
<figcaption
id={figId}
style={{
position: 'absolute',
width: 1,
height: 1,
padding: 0,
margin: -1,
overflow: 'hidden',
clip: 'rect(0, 0, 0, 0)',
whiteSpace: 'nowrap',
borderWidth: 0,
}}>
{embed.alt}
</figcaption>
)}
</figure>
<Controls
videoRef={videoRef}
hlsRef={hlsRef}
active={active}
setActive={setActive}
focused={focused}
setFocused={setFocused}
onScreen={onScreen}
fullscreenRef={containerRef}
hasSubtitleTrack={hasSubtitleTrack}
/>
<MediaInsetBorder />
</div>
</View>
)
}
export class HLSUnsupportedError extends Error {
constructor() {
super('HLS is not supported')
}
}
export class VideoNotFoundError extends Error {
constructor() {
super('Video not found')
}
}
function useHLS({
focused,
playlist,
setHasSubtitleTrack,
setError,
videoRef,
}: {
focused: boolean
playlist: string
setHasSubtitleTrack: (v: boolean) => void
setError: (v: Error | null) => void
videoRef: React.RefObject<HTMLVideoElement>
}) {
const hlsRef = useRef<Hls | undefined>(undefined)
const [lowQualityFragments, setLowQualityFragments] = useState<Fragment[]>([])
// purge low quality segments from buffer on next frag change
const handleFragChange = useNonReactiveCallback(
(_event: Events.FRAG_CHANGED, {frag}: FragChangedData) => {
if (!hlsRef.current) return
const hls = hlsRef.current
if (focused && hls.nextAutoLevel > 0) {
// if the current quality level goes above 0, flush the low quality segments
const flushed: Fragment[] = []
for (const lowQualFrag of lowQualityFragments) {
// avoid if close to the current fragment
if (Math.abs(frag.start - lowQualFrag.start) < 0.1) {
continue
}
hls.trigger(Hls.Events.BUFFER_FLUSHING, {
startOffset: lowQualFrag.start,
endOffset: lowQualFrag.end,
type: 'video',
})
flushed.push(lowQualFrag)
}
setLowQualityFragments(prev => prev.filter(f => !flushed.includes(f)))
}
},
)
useEffect(() => {
if (!videoRef.current) return
if (!Hls.isSupported()) throw new HLSUnsupportedError()
const hls = new Hls({
maxMaxBufferLength: 10, // only load 10s ahead
// note: the amount buffered is affected by both maxBufferLength and maxBufferSize
// it will buffer until it it's greater than *both* of those values
// so we use maxMaxBufferLength to set the actual maximum amount of buffering instead
})
hlsRef.current = hls
hls.attachMedia(videoRef.current)
hls.loadSource(playlist)
// initial value, later on it's managed by Controls
hls.autoLevelCapping = 0
// manually loop, so if we've flushed the first buffer it doesn't get confused
const abortController = new AbortController()
const {signal} = abortController
const videoNode = videoRef.current
videoNode.addEventListener(
'ended',
function () {
videoNode.currentTime = 0
videoNode.play()
},
{signal},
)
hls.on(Hls.Events.SUBTITLE_TRACKS_UPDATED, (_event, data) => {
if (data.subtitleTracks.length > 0) {
setHasSubtitleTrack(true)
}
})
hls.on(Hls.Events.FRAG_BUFFERED, (_event, {frag}) => {
if (frag.level === 0) {
setLowQualityFragments(prev => [...prev, frag])
}
})
hls.on(Hls.Events.ERROR, (_event, data) => {
if (data.fatal) {
if (
data.details === 'manifestLoadError' &&
data.response?.code === 404
) {
setError(new VideoNotFoundError())
} else {
setError(data.error)
}
} else {
console.error(data.error)
}
})
hls.on(Hls.Events.FRAG_CHANGED, handleFragChange)
return () => {
hlsRef.current = undefined
hls.detachMedia()
hls.destroy()
abortController.abort()
}
}, [playlist, setError, setHasSubtitleTrack, videoRef, handleFragChange])
return hlsRef
}
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