# All files / src process.ts

86.93% Statements 153/176
87.87% Branches 29/33
100% Functions 4/4
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     import { spawn } from 'node:child_process'

    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
      }
    }