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import fsPromises from 'fs/promises'
import {
randomUUID
} from 'crypto'
import config from './config.js'
import {
PassThrough,
Writable
} from 'stream'
import {
once
} from 'events'
import streamsPromises from 'stream/promises'
import Throttle from 'throttle'
import childProcess from 'child_process'
import {
logger
} from './util.js'
import path, {
join,
extname
} from 'path'
const {
dir: {
publicDirectory,
fxDirectory
},
constants: {
fallbackBitRate,
englishConversation,
bitRateDivisor,
audioMediaType,
songVolume,
fxVolume
}
} = config
export class Service {
constructor() {
this.clientStreams = new Map()
this.currentSong = englishConversation
this.currentBitRate = 0
this.throttleTransform = {}
this.currentReadable = {}
}
createClientStream() {
const id = randomUUID()
const clientStream = new PassThrough()
this.clientStreams.set(id, clientStream)
return {
id,
clientStream
}
}
removeClientStream(id) {
this.clientStreams.delete(id)
}
_executeSoxCommand(args) {
return childProcess.spawn('sox', args)
}
async getBitRate(song) {
try {
const args = [
'--i', // info
'-B', // bitrate
song
]
const {
stderr, // tudo que é erro
stdout, // tudo que é log
// stdin // enviar dados como stream
} = this._executeSoxCommand(args)
await Promise.all([
once(stderr, 'readable'),
once(stdout, 'readable'),
])
const [success, error] = [stdout, stderr].map(stream => stream.read())
if (error) return await Promise.reject(error)
return success
.toString()
.trim()
.replace(/k/, '000')
} catch (error) {
logger.error(`deu ruim no bitrate: ${error}`)
return fallbackBitRate
}
}
broadCast() {
return new Writable({
write: (chunk, enc, cb) => {
for (const [id, stream] of this.clientStreams) {
// se o cliente descontou não devemos mais mandar dados pra ele
if (stream.writableEnded) {
this.clientStreams.delete(id)
continue;
}
stream.write(chunk)
}
cb()
}
})
}
async startStreamming() {
logger.info(`starting with ${this.currentSong}`)
const bitRate = this.currentBitRate = (await this.getBitRate(this.currentSong)) / bitRateDivisor
const throttleTransform = this.throttleTransform = new Throttle(bitRate)
const songReadable = this.currentReadable = this.createFileStream(this.currentSong)
return streamsPromises.pipeline(
songReadable,
throttleTransform,
this.broadCast()
)
}
stopStreamming() {
this.throttleTransform?.end?.()
}
createFileStream(filename) {
return fs.createReadStream(filename)
}
async getFileInfo(file) {
// file = home/index.html
const fullFilePath = join(publicDirectory, file)
// valida se existe, se não existe estoura erro!!
await fsPromises.access(fullFilePath)
const fileType = extname(fullFilePath)
return {
type: fileType,
name: fullFilePath
}
}
async getFileStream(file) {
const {
name,
type
} = await this.getFileInfo(file)
return {
stream: this.createFileStream(name),
type
}
}
async readFxByName(fxName) {
const songs = await fsPromises.readdir(fxDirectory)
const chosenSong = songs.find(filename => filename.toLowerCase().includes(fxName))
if (!chosenSong) return Promise.reject(`the song ${fxName} wasn't found!`)
return path.join(fxDirectory, chosenSong)
}
appendFxStream(fx) {
const throttleTransformable = new Throttle(this.currentBitRate)
streamsPromises.pipeline(
throttleTransformable,
this.broadCast()
)
const unpipe = () => {
const transformStream = this.mergeAudioStreams(fx, this.currentReadable)
this.throttleTransform = throttleTransformable
this.currentReadable = transformStream
this.currentReadable.removeListener('unpipe', unpipe)
streamsPromises.pipeline(
transformStream,
throttleTransformable
)
}
this.throttleTransform.on('unpipe', unpipe)
this.throttleTransform.pause()
this.currentReadable.unpipe(this.throttleTransform)
}
mergeAudioStreams(song, readable) {
const transformStream = PassThrough()
const args = [
'-t', audioMediaType,
'-v', songVolume,
// -m => merge -> o - é para receber como stream
'-m', '-',
'-t', audioMediaType,
'-v', fxVolume,
song,
'-t', audioMediaType,
'-'
]
const {
stdout,
stdin
} = this._executeSoxCommand(args)
// plugamos a stream de conversacao
// na entrada de dados do terminal
streamsPromises.pipeline(
readable,
stdin
)
// .catch(error => logger.error(`error on sending stream to sox: ${error}`))
streamsPromises.pipeline(
stdout,
transformStream
)
// .catch(error => logger.error(`error on receiving stream from sox: ${error}`))
return transformStream
}
} |