PeerTube/server/lib/hls.ts

262 lines
9.6 KiB
TypeScript

import { close, ensureDir, move, open, outputJSON, read, readFile, remove, stat, writeFile } from 'fs-extra'
import { flatten, uniq } from 'lodash'
import PQueue from 'p-queue'
import { basename, dirname, join } from 'path'
import { MStreamingPlaylist, MStreamingPlaylistFilesVideo, MVideo } from '@server/types/models'
import { sha256 } from '@shared/extra-utils'
import { VideoStorage } from '@shared/models'
import { getAudioStreamCodec, getVideoStreamCodec, getVideoStreamDimensionsInfo } from '../helpers/ffmpeg'
import { logger } from '../helpers/logger'
import { doRequest, doRequestAndSaveToFile } from '../helpers/requests'
import { generateRandomString } from '../helpers/utils'
import { CONFIG } from '../initializers/config'
import { P2P_MEDIA_LOADER_PEER_VERSION, REQUEST_TIMEOUTS } from '../initializers/constants'
import { sequelizeTypescript } from '../initializers/database'
import { VideoFileModel } from '../models/video/video-file'
import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
import { storeHLSFile } from './object-storage'
import { generateHLSMasterPlaylistFilename, generateHlsSha256SegmentsFilename, getHlsResolutionPlaylistFilename } from './paths'
import { VideoPathManager } from './video-path-manager'
async function updateStreamingPlaylistsInfohashesIfNeeded () {
const playlistsToUpdate = await VideoStreamingPlaylistModel.listByIncorrectPeerVersion()
// Use separate SQL queries, because we could have many videos to update
for (const playlist of playlistsToUpdate) {
await sequelizeTypescript.transaction(async t => {
const videoFiles = await VideoFileModel.listByStreamingPlaylist(playlist.id, t)
playlist.assignP2PMediaLoaderInfoHashes(playlist.Video, videoFiles)
playlist.p2pMediaLoaderPeerVersion = P2P_MEDIA_LOADER_PEER_VERSION
await playlist.save({ transaction: t })
})
}
}
async function updatePlaylistAfterFileChange (video: MVideo, playlist: MStreamingPlaylist) {
try {
let playlistWithFiles = await updateMasterHLSPlaylist(video, playlist)
playlistWithFiles = await updateSha256VODSegments(video, playlist)
// Refresh playlist, operations can take some time
playlistWithFiles = await VideoStreamingPlaylistModel.loadWithVideoAndFiles(playlist.id)
playlistWithFiles.assignP2PMediaLoaderInfoHashes(video, playlistWithFiles.VideoFiles)
await playlistWithFiles.save()
video.setHLSPlaylist(playlistWithFiles)
} catch (err) {
logger.info('Cannot update playlist after file change. Maybe due to concurrent transcoding', { err })
}
}
// ---------------------------------------------------------------------------
// Avoid concurrency issues when updating streaming playlist files
const playlistFilesQueue = new PQueue({ concurrency: 1 })
function updateMasterHLSPlaylist (video: MVideo, playlistArg: MStreamingPlaylist): Promise<MStreamingPlaylistFilesVideo> {
return playlistFilesQueue.add(async () => {
const playlist = await VideoStreamingPlaylistModel.loadWithVideoAndFiles(playlistArg.id)
const masterPlaylists: string[] = [ '#EXTM3U', '#EXT-X-VERSION:3' ]
for (const file of playlist.VideoFiles) {
const playlistFilename = getHlsResolutionPlaylistFilename(file.filename)
await VideoPathManager.Instance.makeAvailableVideoFile(file.withVideoOrPlaylist(playlist), async videoFilePath => {
const size = await getVideoStreamDimensionsInfo(videoFilePath)
const bandwidth = 'BANDWIDTH=' + video.getBandwidthBits(file)
const resolution = `RESOLUTION=${size?.width || 0}x${size?.height || 0}`
let line = `#EXT-X-STREAM-INF:${bandwidth},${resolution}`
if (file.fps) line += ',FRAME-RATE=' + file.fps
const codecs = await Promise.all([
getVideoStreamCodec(videoFilePath),
getAudioStreamCodec(videoFilePath)
])
line += `,CODECS="${codecs.filter(c => !!c).join(',')}"`
masterPlaylists.push(line)
masterPlaylists.push(playlistFilename)
})
}
if (playlist.playlistFilename) {
await video.removeStreamingPlaylistFile(playlist, playlist.playlistFilename)
}
playlist.playlistFilename = generateHLSMasterPlaylistFilename(video.isLive)
const masterPlaylistPath = VideoPathManager.Instance.getFSHLSOutputPath(video, playlist.playlistFilename)
await writeFile(masterPlaylistPath, masterPlaylists.join('\n') + '\n')
if (playlist.storage === VideoStorage.OBJECT_STORAGE) {
playlist.playlistUrl = await storeHLSFile(playlist, playlist.playlistFilename)
await remove(masterPlaylistPath)
}
return playlist.save()
})
}
// ---------------------------------------------------------------------------
function updateSha256VODSegments (video: MVideo, playlistArg: MStreamingPlaylist): Promise<MStreamingPlaylistFilesVideo> {
return playlistFilesQueue.add(async () => {
const json: { [filename: string]: { [range: string]: string } } = {}
const playlist = await VideoStreamingPlaylistModel.loadWithVideoAndFiles(playlistArg.id)
// For all the resolutions available for this video
for (const file of playlist.VideoFiles) {
const rangeHashes: { [range: string]: string } = {}
const fileWithPlaylist = file.withVideoOrPlaylist(playlist)
await VideoPathManager.Instance.makeAvailableVideoFile(fileWithPlaylist, videoPath => {
return VideoPathManager.Instance.makeAvailableResolutionPlaylistFile(fileWithPlaylist, async resolutionPlaylistPath => {
const playlistContent = await readFile(resolutionPlaylistPath)
const ranges = getRangesFromPlaylist(playlistContent.toString())
const fd = await open(videoPath, 'r')
for (const range of ranges) {
const buf = Buffer.alloc(range.length)
await read(fd, buf, 0, range.length, range.offset)
rangeHashes[`${range.offset}-${range.offset + range.length - 1}`] = sha256(buf)
}
await close(fd)
const videoFilename = file.filename
json[videoFilename] = rangeHashes
})
})
}
if (playlist.segmentsSha256Filename) {
await video.removeStreamingPlaylistFile(playlist, playlist.segmentsSha256Filename)
}
playlist.segmentsSha256Filename = generateHlsSha256SegmentsFilename(video.isLive)
const outputPath = VideoPathManager.Instance.getFSHLSOutputPath(video, playlist.segmentsSha256Filename)
await outputJSON(outputPath, json)
if (playlist.storage === VideoStorage.OBJECT_STORAGE) {
playlist.segmentsSha256Url = await storeHLSFile(playlist, playlist.segmentsSha256Filename)
await remove(outputPath)
}
return playlist.save()
})
}
// ---------------------------------------------------------------------------
async function buildSha256Segment (segmentPath: string) {
const buf = await readFile(segmentPath)
return sha256(buf)
}
function downloadPlaylistSegments (playlistUrl: string, destinationDir: string, timeout: number, bodyKBLimit: number) {
let timer
let remainingBodyKBLimit = bodyKBLimit
logger.info('Importing HLS playlist %s', playlistUrl)
return new Promise<void>(async (res, rej) => {
const tmpDirectory = join(CONFIG.STORAGE.TMP_DIR, await generateRandomString(10))
await ensureDir(tmpDirectory)
timer = setTimeout(() => {
deleteTmpDirectory(tmpDirectory)
return rej(new Error('HLS download timeout.'))
}, timeout)
try {
// Fetch master playlist
const subPlaylistUrls = await fetchUniqUrls(playlistUrl)
const subRequests = subPlaylistUrls.map(u => fetchUniqUrls(u))
const fileUrls = uniq(flatten(await Promise.all(subRequests)))
logger.debug('Will download %d HLS files.', fileUrls.length, { fileUrls })
for (const fileUrl of fileUrls) {
const destPath = join(tmpDirectory, basename(fileUrl))
await doRequestAndSaveToFile(fileUrl, destPath, { bodyKBLimit: remainingBodyKBLimit, timeout: REQUEST_TIMEOUTS.REDUNDANCY })
const { size } = await stat(destPath)
remainingBodyKBLimit -= (size / 1000)
logger.debug('Downloaded HLS playlist file %s with %d kB remained limit.', fileUrl, Math.floor(remainingBodyKBLimit))
}
clearTimeout(timer)
await move(tmpDirectory, destinationDir, { overwrite: true })
return res()
} catch (err) {
deleteTmpDirectory(tmpDirectory)
return rej(err)
}
})
function deleteTmpDirectory (directory: string) {
remove(directory)
.catch(err => logger.error('Cannot delete path on HLS download error.', { err }))
}
async function fetchUniqUrls (playlistUrl: string) {
const { body } = await doRequest(playlistUrl)
if (!body) return []
const urls = body.split('\n')
.filter(line => line.endsWith('.m3u8') || line.endsWith('.mp4'))
.map(url => {
if (url.startsWith('http://') || url.startsWith('https://')) return url
return `${dirname(playlistUrl)}/${url}`
})
return uniq(urls)
}
}
// ---------------------------------------------------------------------------
export {
updateMasterHLSPlaylist,
updateSha256VODSegments,
buildSha256Segment,
downloadPlaylistSegments,
updateStreamingPlaylistsInfohashesIfNeeded,
updatePlaylistAfterFileChange
}
// ---------------------------------------------------------------------------
function getRangesFromPlaylist (playlistContent: string) {
const ranges: { offset: number, length: number }[] = []
const lines = playlistContent.split('\n')
const regex = /^#EXT-X-BYTERANGE:(\d+)@(\d+)$/
for (const line of lines) {
const captured = regex.exec(line)
if (captured) {
ranges.push({ length: parseInt(captured[1], 10), offset: parseInt(captured[2], 10) })
}
}
return ranges
}