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import { isWindows } from './utils/platform'
import {
extractErrorMessage,
extractProgress,
CodecDataExtractor
} from './utils/parsing'
import LineBuffer from './utils/line-buffer'
import { InputCodecInformation, ProgressInformation } from './utils/data-types'
import { Readable, Writable } from 'node:stream'
export type RunResult = {
stderr: string
stdout: string
}
export type RunOptions = {
nice?: number
cwd?: string
timeout?: number
onProgress?: (progress: ProgressInformation) => void
onCodecData?: (data: InputCodecInformation) => void
onStderr?: (line: string) => void
}
export type ProcessOptions = RunOptions & {
args: string[]
captureStdout?: boolean
inputStream?: Readable
outputStream?: Writable
}
export class FfmpegProcess implements ProcessOptions {
args: string[]
nice?: number
cwd?: string
timeout?: number
captureStdout?: boolean
inputStream?: Readable
outputStream?: Writable
onProgress?: (progress: ProgressInformation) => void
onCodecData?: (data: InputCodecInformation) => void
onStderr?: (line: string) => void
constructor(options: ProcessOptions) {
this.args = options.args
this.nice = options.nice
this.cwd = options.cwd
this.timeout = options.timeout
this.captureStdout = options.captureStdout
this.inputStream = options.inputStream
this.outputStream = options.outputStream
this.onProgress = options.onProgress
this.onCodecData = options.onCodecData
this.onStderr = options.onStderr
this.#validateOptions()
}
#validateOptions() {
if (this.outputStream && this.captureStdout) {
throw new Error(
"Cannot use 'captureStdout' when a stream output is present"
)
}
}
// TODO return a compound type that is PromiseLike and has methods on the process (like kill)
run(callback?: (err: any, result?: any) => any): Promise<RunResult> {
let cmd = process.env.FFMPEG_PATH || 'ffmpeg'
let args: string[] = [...this.args]
let { onProgress, onCodecData, onStderr } = this
if (this.nice && this.nice !== 0 && !isWindows) {
args = ['-n', this.nice.toString(), cmd, ...args]
cmd = 'nice'
}
let promise: Promise<RunResult> = new Promise((resolve, reject) => {
let child = spawn(cmd, args, {
cwd: this.cwd,
timeout: this.timeout,
windowsHide: true
})
let stderr = new LineBuffer()
let stdout = new LineBuffer()
if (onStderr) {
stderr.on('line', onStderr)
}
if (onProgress) {
stderr.on('line', (line: string) => {
let progress = extractProgress(line)
if (progress) {
onProgress?.(progress)
}
})
}
if (onCodecData) {
let extractor = new CodecDataExtractor(onCodecData)
stderr.on('line', (line: string) => {
if (!extractor.done) {
extractor.processLine(line)
}
})
}
child.on('error', (err) => reject(err))
child.on('close', (code, signal) => {
stderr.close()
stdout.close()
if (signal) {
reject(new Error(`ffmpeg was killed with signal ${signal}`))
} else if (code) {
let message = `ffmpeg exited with code ${code}`
let error = extractErrorMessage(stderr.lines)
if (error) {
message = `${message}:\n${error}`
}
reject(new Error(message))
} else {
resolve({
stdout: stdout.toString(),
stderr: stderr.toString()
})
}
})
if (this.inputStream) {
this.inputStream.pipe(child.stdin)
this.inputStream.on('error', (err) => {
// TODO make a specific error type
reject(err)
child.kill()
})
// Prevent stdin errors from bubbling up, ffmpeg will crash anyway
child.stdin.on('error', () => {})
}
child.stderr.on('data', (data) => stderr.append(data.toString()))
if (this.outputStream) {
child.stdout.pipe(this.outputStream)
this.outputStream.on('error', (err) => {
// TODO make a specific error type
reject(err)
child.kill()
})
} else if (this.captureStdout) {
child.stdout.on('data', (data) => stdout.append(data.toString()))
}
})
if (callback) {
promise.then(
(value) => callback(null, value),
(reason) => callback(reason)
)
}
return promise
}
}
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