mirror of
https://github.com/advplyr/audiobookshelf.git
synced 2024-10-05 17:52:32 +02:00
436 lines
14 KiB
JavaScript
436 lines
14 KiB
JavaScript
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const EventEmitter = require('events')
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const Path = require('path')
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const Logger = require('../Logger')
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const SocketAuthority = require('../SocketAuthority')
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const fs = require('../libs/fsExtra')
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const Ffmpeg = require('../libs/fluentFfmpeg')
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const { secondsToTimestamp } = require('../utils/index')
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const { writeConcatFile } = require('../utils/ffmpegHelpers')
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const { AudioMimeType } = require('../utils/constants')
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const hlsPlaylistGenerator = require('../utils/hlsPlaylistGenerator')
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const AudioTrack = require('./files/AudioTrack')
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class Stream extends EventEmitter {
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constructor(sessionId, streamPath, user, libraryItem, episodeId, startTime, transcodeOptions = {}) {
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super()
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this.id = sessionId
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this.user = user
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this.libraryItem = libraryItem
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this.episodeId = episodeId
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this.transcodeOptions = transcodeOptions
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this.segmentLength = 6
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this.maxSeekBackTime = 30
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this.streamPath = Path.join(streamPath, this.id)
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this.concatFilesPath = Path.join(this.streamPath, 'files.txt')
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this.playlistPath = Path.join(this.streamPath, 'output.m3u8')
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this.finalPlaylistPath = Path.join(this.streamPath, 'final-output.m3u8')
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this.startTime = startTime
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this.ffmpeg = null
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this.loop = null
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this.isResetting = false
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this.isClientInitialized = false
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this.isTranscodeComplete = false
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this.segmentsCreated = new Set()
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this.furthestSegmentCreated = 0
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}
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get isPodcast() {
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return this.libraryItem.mediaType === 'podcast'
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}
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get episode() {
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if (!this.isPodcast) return null
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return this.libraryItem.media.episodes.find(ep => ep.id === this.episodeId)
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}
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get libraryItemId() {
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return this.libraryItem.id
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}
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get mediaTitle() {
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if (this.episode) return this.episode.title || ''
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return this.libraryItem.media.metadata.title || ''
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}
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get totalDuration() {
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if (this.episode) return this.episode.duration
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return this.libraryItem.media.duration
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}
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get tracks() {
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if (this.episode) return this.episode.tracks
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return this.libraryItem.media.tracks
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}
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get tracksAudioFileType() {
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if (!this.tracks.length) return null
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return this.tracks[0].metadata.format
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}
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get tracksMimeType() {
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if (!this.tracks.length) return null
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return this.tracks[0].mimeType
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}
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get tracksCodec() {
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if (!this.tracks.length) return null
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return this.tracks[0].codec
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}
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get mimeTypesToForceAAC() {
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return [
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AudioMimeType.FLAC,
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AudioMimeType.OPUS,
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AudioMimeType.WMA,
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AudioMimeType.AIFF,
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AudioMimeType.WEBM,
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AudioMimeType.WEBMA
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]
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}
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get codecsToForceAAC() {
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return [
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'alac'
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]
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}
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get userToken() {
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return this.user.token
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}
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// Fmp4 does not work on iOS devices: https://github.com/advplyr/audiobookshelf-app/issues/85
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// Workaround: Force AAC transcode for FLAC
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get hlsSegmentType() {
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return 'mpegts'
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}
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get segmentBasename() {
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if (this.hlsSegmentType === 'fmp4') return 'output-%d.m4s'
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return 'output-%d.ts'
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}
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get segmentStartNumber() {
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if (!this.startTime) return 0
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return Math.floor(Math.max(this.startTime - this.maxSeekBackTime, 0) / this.segmentLength)
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}
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get numSegments() {
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var numSegs = Math.floor(this.totalDuration / this.segmentLength)
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if (this.totalDuration - (numSegs * this.segmentLength) > 0) {
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numSegs++
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}
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return numSegs
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}
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get clientPlaylistUri() {
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return `/hls/${this.id}/output.m3u8`
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}
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get isAACEncodable() {
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return ['mp4', 'm4a', 'm4b'].includes(this.tracksAudioFileType)
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}
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get transcodeForceAAC() {
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return !!this.transcodeOptions.forceAAC
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}
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toJSON() {
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return {
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id: this.id,
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userId: this.user.id,
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libraryItem: this.libraryItem.toJSONExpanded(),
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episode: this.episode ? this.episode.toJSONExpanded() : null,
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segmentLength: this.segmentLength,
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playlistPath: this.playlistPath,
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clientPlaylistUri: this.clientPlaylistUri,
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startTime: this.startTime,
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segmentStartNumber: this.segmentStartNumber,
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isTranscodeComplete: this.isTranscodeComplete,
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}
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}
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async checkSegmentNumberRequest(segNum) {
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const segStartTime = segNum * this.segmentLength
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if (this.startTime > segStartTime) {
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Logger.warn(`[STREAM] Segment #${segNum} Request @${secondsToTimestamp(segStartTime)} is before start time (${secondsToTimestamp(this.startTime)}) - Reset Transcode`)
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await this.reset(segStartTime - (this.segmentLength * 2))
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return segStartTime
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} else if (this.isTranscodeComplete) {
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return false
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}
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const distanceFromFurthestSegment = segNum - this.furthestSegmentCreated
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if (distanceFromFurthestSegment > 10) {
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Logger.info(`Segment #${segNum} requested is ${distanceFromFurthestSegment} segments from latest (${secondsToTimestamp(segStartTime)}) - Reset Transcode`)
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await this.reset(segStartTime - (this.segmentLength * 2))
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return segStartTime
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}
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return false
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}
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async generatePlaylist() {
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await fs.ensureDir(this.streamPath)
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await hlsPlaylistGenerator(this.playlistPath, 'output', this.totalDuration, this.segmentLength, this.hlsSegmentType, this.userToken)
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return this.clientPlaylistUri
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}
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async checkFiles() {
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try {
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var files = await fs.readdir(this.streamPath)
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files.forEach((file) => {
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var extname = Path.extname(file)
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if (extname === '.ts' || extname === '.m4s') {
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var basename = Path.basename(file, extname)
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var num_part = basename.split('-')[1]
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var part_num = Number(num_part)
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this.segmentsCreated.add(part_num)
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}
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})
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if (!this.segmentsCreated.size) {
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Logger.warn('No Segments')
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return
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}
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if (this.segmentsCreated.size > 6 && !this.isClientInitialized) {
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this.isClientInitialized = true
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Logger.info(`[STREAM] ${this.id} notifying client that stream is ready`)
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this.clientEmit('stream_open', this.toJSON())
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}
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var chunks = []
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var current_chunk = []
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var last_seg_in_chunk = -1
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var segments = Array.from(this.segmentsCreated).sort((a, b) => a - b);
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var lastSegment = segments[segments.length - 1]
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if (lastSegment > this.furthestSegmentCreated) {
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this.furthestSegmentCreated = lastSegment
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}
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segments.forEach((seg) => {
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if (!current_chunk.length || last_seg_in_chunk + 1 === seg) {
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last_seg_in_chunk = seg
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current_chunk.push(seg)
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} else {
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if (current_chunk.length === 1) chunks.push(current_chunk[0])
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else chunks.push(`${current_chunk[0]}-${current_chunk[current_chunk.length - 1]}`)
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last_seg_in_chunk = seg
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current_chunk = [seg]
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}
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})
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if (current_chunk.length) {
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if (current_chunk.length === 1) chunks.push(current_chunk[0])
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else chunks.push(`${current_chunk[0]}-${current_chunk[current_chunk.length - 1]}`)
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}
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var perc = (this.segmentsCreated.size * 100 / this.numSegments).toFixed(2) + '%'
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Logger.info('[STREAM-CHECK] Check Files', this.segmentsCreated.size, 'of', this.numSegments, perc, `Furthest Segment: ${this.furthestSegmentCreated}`)
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// Logger.debug('[STREAM-CHECK] Chunks', chunks.join(', '))
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this.clientEmit('stream_progress', {
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stream: this.id,
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percent: perc,
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chunks,
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numSegments: this.numSegments
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})
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} catch (error) {
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Logger.error('Failed checking files', error)
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}
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}
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startLoop() {
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this.clientEmit('stream_progress', { stream: this.id, chunks: [], numSegments: 0, percent: '0%' })
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clearInterval(this.loop)
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var intervalId = setInterval(() => {
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if (!this.isTranscodeComplete) {
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this.checkFiles()
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} else {
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Logger.info(`[Stream] ${this.mediaTitle} sending stream_ready`)
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this.clientEmit('stream_ready')
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clearInterval(intervalId)
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}
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}, 2000)
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this.loop = intervalId
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}
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async start() {
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Logger.info(`[STREAM] START STREAM - Num Segments: ${this.numSegments}`)
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this.ffmpeg = Ffmpeg()
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var adjustedStartTime = Math.max(this.startTime - this.maxSeekBackTime, 0)
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var trackStartTime = await writeConcatFile(this.tracks, this.concatFilesPath, adjustedStartTime)
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this.ffmpeg.addInput(this.concatFilesPath)
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// seek_timestamp : https://ffmpeg.org/ffmpeg.html
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// the argument to the -ss option is considered an actual timestamp, and is not offset by the start time of the file
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// fixes https://github.com/advplyr/audiobookshelf/issues/116
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this.ffmpeg.inputOption('-seek_timestamp 1')
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this.ffmpeg.inputFormat('concat')
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this.ffmpeg.inputOption('-safe 0')
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if (adjustedStartTime > 0) {
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const shiftedStartTime = adjustedStartTime - trackStartTime
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// Issues using exact fractional seconds i.e. 29.49814 - changing to 29.5s
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var startTimeS = Math.round(shiftedStartTime * 10) / 10 + 's'
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Logger.info(`[STREAM] Starting Stream at startTime ${secondsToTimestamp(adjustedStartTime)} (User startTime ${secondsToTimestamp(this.startTime)}) and Segment #${this.segmentStartNumber}`)
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this.ffmpeg.inputOption(`-ss ${startTimeS}`)
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this.ffmpeg.inputOption('-noaccurate_seek')
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}
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const logLevel = process.env.NODE_ENV === 'production' ? 'error' : 'warning'
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let audioCodec = 'copy'
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if (this.transcodeForceAAC || this.mimeTypesToForceAAC.includes(this.tracksMimeType) || this.codecsToForceAAC.includes(this.tracksCodec)) {
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Logger.debug(`[Stream] Forcing AAC for tracks with mime type ${this.tracksMimeType} and codec ${this.tracksCodec}`)
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audioCodec = 'aac'
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}
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this.ffmpeg.addOption([
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`-loglevel ${logLevel}`,
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'-map 0:a',
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`-c:a ${audioCodec}`
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])
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const hlsOptions = [
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'-f hls',
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"-copyts",
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"-avoid_negative_ts make_non_negative",
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"-max_delay 5000000",
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"-max_muxing_queue_size 2048",
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`-hls_time 6`,
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`-hls_segment_type ${this.hlsSegmentType}`,
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`-start_number ${this.segmentStartNumber}`,
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"-hls_playlist_type vod",
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"-hls_list_size 0",
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"-hls_allow_cache 0"
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]
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if (this.hlsSegmentType === 'fmp4') {
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hlsOptions.push('-strict -2')
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var fmp4InitFilename = Path.join(this.streamPath, 'init.mp4')
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// var fmp4InitFilename = 'init.mp4'
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hlsOptions.push(`-hls_fmp4_init_filename ${fmp4InitFilename}`)
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}
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this.ffmpeg.addOption(hlsOptions)
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var segmentFilename = Path.join(this.streamPath, this.segmentBasename)
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this.ffmpeg.addOption(`-hls_segment_filename ${segmentFilename}`)
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this.ffmpeg.output(this.finalPlaylistPath)
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this.ffmpeg.on('start', (command) => {
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Logger.info('[INFO] FFMPEG transcoding started with command: ' + command)
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Logger.info('')
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if (this.isResetting) {
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// AAC encode is much slower
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const clearIsResettingTime = this.transcodeForceAAC ? 3000 : 500
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setTimeout(() => {
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Logger.info('[STREAM] Clearing isResetting')
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this.isResetting = false
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this.startLoop()
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}, clearIsResettingTime)
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} else {
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this.startLoop()
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}
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})
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this.ffmpeg.on('stderr', (stdErrline) => {
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Logger.info(stdErrline)
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})
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this.ffmpeg.on('error', (err, stdout, stderr) => {
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if (err.message && err.message.includes('SIGKILL')) {
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// This is an intentional SIGKILL
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Logger.info('[FFMPEG] Transcode Killed')
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this.ffmpeg = null
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clearInterval(this.loop)
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} else {
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Logger.error('Ffmpeg Err', '"' + err.message + '"')
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// Temporary workaround for https://github.com/advplyr/audiobookshelf/issues/172
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const aacErrorMsg = 'ffmpeg exited with code 1: Could not write header for output file #0 (incorrect codec parameters ?)'
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if (audioCodec === 'copy' && this.isAACEncodable && err.message && err.message.startsWith(aacErrorMsg)) {
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Logger.info(`[Stream] Re-attempting stream with AAC encode`)
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this.transcodeOptions.forceAAC = true
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this.reset(this.startTime)
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} else {
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// Close stream show error
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this.close(err.message)
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}
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}
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})
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this.ffmpeg.on('end', (stdout, stderr) => {
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Logger.info('[FFMPEG] Transcoding ended')
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// For very small fast load
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if (!this.isClientInitialized) {
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this.isClientInitialized = true
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Logger.info(`[STREAM] ${this.id} notifying client that stream is ready`)
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this.clientEmit('stream_open', this.toJSON())
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}
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this.isTranscodeComplete = true
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this.ffmpeg = null
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clearInterval(this.loop)
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})
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this.ffmpeg.run()
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}
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async close(errorMessage = null) {
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clearInterval(this.loop)
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Logger.info('Closing Stream', this.id)
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if (this.ffmpeg) {
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this.ffmpeg.kill('SIGKILL')
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}
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await fs.remove(this.streamPath).then(() => {
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Logger.info('Deleted session data', this.streamPath)
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}).catch((err) => {
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Logger.error('Failed to delete session data', err)
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})
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if (errorMessage) this.clientEmit('stream_error', { id: this.id, error: (errorMessage || '').trim() })
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else this.clientEmit('stream_closed', this.id)
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this.emit('closed')
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}
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cancelTranscode() {
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clearInterval(this.loop)
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if (this.ffmpeg) {
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this.ffmpeg.kill('SIGKILL')
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}
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}
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async waitCancelTranscode() {
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for (let i = 0; i < 20; i++) {
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if (!this.ffmpeg) return true
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await new Promise((resolve) => setTimeout(resolve, 500))
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}
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Logger.error('[STREAM] Transcode never closed...')
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return false
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}
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async reset(time) {
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if (this.isResetting) {
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return Logger.info(`[STREAM] Stream ${this.id} already resetting`)
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}
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time = Math.max(0, time)
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this.isResetting = true
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if (this.ffmpeg) {
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this.cancelTranscode()
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await this.waitCancelTranscode()
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}
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this.isTranscodeComplete = false
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this.startTime = time
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// this.clientCurrentTime = this.startTime
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Logger.info(`Stream Reset New Start Time ${secondsToTimestamp(this.startTime)}`)
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this.start()
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}
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clientEmit(evtName, data) {
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SocketAuthority.clientEmitter(this.user.id, evtName, data)
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}
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getAudioTrack() {
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var newAudioTrack = new AudioTrack()
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newAudioTrack.setFromStream(this.mediaTitle, this.totalDuration, this.clientPlaylistUri)
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return newAudioTrack
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}
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}
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module.exports = Stream |