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import React from 'react'
import {parse} from 'hls-parser'
import {MasterPlaylist, MediaPlaylist, Variant} from 'hls-parser/types'
interface PostMessageData {
action: 'progress' | 'error'
messageStr?: string
messageFloat?: number
}
function postMessage(data: PostMessageData) {
// @ts-expect-error safari webview only
if (window?.webkit) {
// @ts-expect-error safari webview only
window.webkit.messageHandlers.onMessage.postMessage(JSON.stringify(data))
// @ts-expect-error android webview only
} else if (AndroidInterface) {
// @ts-expect-error android webview only
AndroidInterface.onMessage(JSON.stringify(data))
}
}
function createSegementUrl(originalUrl: string, newFile: string) {
const parts = originalUrl.split('/')
parts[parts.length - 1] = newFile
return parts.join('/')
}
export function VideoDownloadScreen() {
const ffmpegRef = React.useRef<any>(null)
const fetchFileRef = React.useRef<any>(null)
const [dataUrl, setDataUrl] = React.useState<any>(null)
const load = React.useCallback(async () => {
const ffmpegLib = await import('@ffmpeg/ffmpeg')
const ffmpeg = new ffmpegLib.FFmpeg()
ffmpegRef.current = ffmpeg
const ffmpegUtilLib = await import('@ffmpeg/util')
fetchFileRef.current = ffmpegUtilLib.fetchFile
const baseURL = 'https://unpkg.com/@ffmpeg/core@0.12.6/dist/esm'
await ffmpeg.load({
coreURL: await ffmpegUtilLib.toBlobURL(
`${baseURL}/ffmpeg-core.js`,
'text/javascript',
),
wasmURL: await ffmpegUtilLib.toBlobURL(
`${baseURL}/ffmpeg-core.wasm`,
'application/wasm',
),
})
}, [])
const createMp4 = React.useCallback(async (videoUrl: string) => {
// Get the master playlist and find the best variant
const masterPlaylistRes = await fetch(videoUrl)
const masterPlaylistText = await masterPlaylistRes.text()
const masterPlaylist = parse(masterPlaylistText) as MasterPlaylist
// If URL given is not a master playlist, we probably cannot handle this.
if (!masterPlaylist.isMasterPlaylist) {
postMessage({
action: 'error',
messageStr: 'A master playlist was not found in the provided playlist.',
})
return
}
// Figure out what the best quality is. These should generally be in order, but we'll check them all just in case
let bestVariant: Variant | undefined
for (const variant of masterPlaylist.variants) {
if (!bestVariant || variant.bandwidth > bestVariant.bandwidth) {
bestVariant = variant
}
}
// Should only happen if there was no variants at all given to us. Mostly for types.
if (!bestVariant) {
postMessage({
action: 'error',
messageStr: 'No variants were found in the provided master playlist.',
})
return
}
const urlParts = videoUrl.split('/')
urlParts[urlParts.length - 1] = bestVariant?.uri
const bestVariantUrl = urlParts.join('/')
// Download and parse m3u8
const hlsFileRes = await fetch(bestVariantUrl)
const hlsPlainText = await hlsFileRes.text()
const playlist = parse(hlsPlainText) as MediaPlaylist
// This one shouldn't be a master playlist - again just for types really
if (playlist.isMasterPlaylist) {
postMessage({
action: 'error',
messageStr: 'An unknown error has occurred.',
})
return
}
const ffmpeg = ffmpegRef.current
// Get the correctly ordered file names. We need to remove the tracking info from the end of the file name
const segments = playlist.segments.map(segment => {
return segment.uri.split('?')[0]
})
// Download each segment
let error: string | null = null
let completed = 0
await Promise.all(
playlist.segments.map(async segment => {
const uri = createSegementUrl(bestVariantUrl, segment.uri)
const filename = segment.uri.split('?')[0]
const res = await fetch(uri)
if (!res.ok) {
error = 'Failed to download playlist segment.'
}
const blob = await res.blob()
try {
await ffmpeg.writeFile(filename, await fetchFileRef.current(blob))
} catch (e: unknown) {
error = 'Failed to write file.'
} finally {
completed++
const progress = completed / playlist.segments.length
postMessage({
action: 'progress',
messageFloat: progress,
})
}
}),
)
// Do something if there was an error
if (error) {
postMessage({
action: 'error',
messageStr: error,
})
return
}
// Put the segments together
await ffmpeg.exec([
'-i',
`concat:${segments.join('|')}`,
'-c:v',
'copy',
'output.mp4',
])
const fileData = await ffmpeg.readFile('output.mp4')
const blob = new Blob([fileData.buffer], {type: 'video/mp4'})
const dataUrl = await new Promise<string | null>(resolve => {
const reader = new FileReader()
reader.onloadend = () => resolve(reader.result as string)
reader.onerror = () => resolve(null)
reader.readAsDataURL(blob)
})
return dataUrl
}, [])
const download = React.useCallback(
async (videoUrl: string) => {
await load()
const mp4Res = await createMp4(videoUrl)
if (!mp4Res) {
postMessage({
action: 'error',
messageStr: 'An error occurred while creating the MP4.',
})
return
}
setDataUrl(mp4Res)
},
[createMp4, load],
)
React.useEffect(() => {
const url = new URL(window.location.href)
const videoUrl = url.searchParams.get('videoUrl')
if (!videoUrl) {
postMessage({action: 'error', messageStr: 'No video URL provided'})
} else {
setDataUrl(null)
download(videoUrl)
}
}, [download])
if (!dataUrl) return null
return (
<div>
<a
href={dataUrl}
ref={el => {
el?.click()
}}
download="video.mp4"
/>
</div>
)
}
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