# All files / src output.ts

97.97% Statements 194/198
93.75% Branches 30/32
100% Functions 9/9
97.97% Lines 194/198

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     import { Writable } from 'node:stream'

    import { protocolRegexp } from './utils/regexp'
    import { formatBitrate } from './utils/formatting'
    import { FilterChain, generateFilterChain } from './utils/filters'

    export type OutputAudioOptions = {
      codec?: string
      bitrate?: string | number
      channels?: number
      frequency?: number
      quality?: number
      filters?: FilterChain
    }

    export type OutputVideoOptions = {
      codec?: string
      bitrate?: string | number
      constantBitrate?: boolean
      fps?: number
      frames?: number
      filters?: FilterChain
    }

    type OutputTarget = string | Writable

    export type OutputOptions = {
      target: OutputTarget
      seek?: string | number
      duration?: string | number
      format?: string
      map?: string
      customArgs?: string[]

      audio?: false | OutputAudioOptions
      video?: false | OutputVideoOptions
    }

    export type OutputDefinition = OutputTarget | OutputOptions

    export class FfmpegOutput implements OutputOptions {
      target: OutputTarget
      seek?: string | number
      duration?: string | number
      format?: string
      map?: string
      customArgs: string[]

      audio?: false | OutputAudioOptions
      video?: false | OutputVideoOptions

      constructor(options: OutputDefinition) {
        if (typeof options === 'string' || options instanceof Writable) {
          options = { target: options }
        }

        this.target = options.target
        this.seek = options.seek
        this.duration = options.duration
        this.format = options.format
        this.map = options.map
        this.customArgs = options.customArgs || []

        this.audio = options.audio
        this.video = options.video
      }

      get isStream(): boolean {
        return this.target instanceof Writable
      }

      get isLocalFile(): boolean {
        if (this.target instanceof Writable) {
          return false
        } else {
          let protocol = this.target.match(protocolRegexp)
          return !protocol || protocol[1] === 'file'
        }
      }

      #getAudioOptions(): string[] {
        let options: string[] = []

        if (this.audio === false) {
          options.push('-an')
        } else if (this.audio) {
          if (this.audio.codec) {
            options.push('-acodec', this.audio.codec)
          }

          if (this.audio.bitrate) {
            options.push('-b:a', formatBitrate(this.audio.bitrate))
          }

          if (this.audio.channels) {
            options.push('-ac', this.audio.channels.toString())
          }

          if (this.audio.frequency) {
            options.push('-ar', this.audio.frequency.toString())
          }

          if (this.audio.quality) {
            options.push('-aq', this.audio.quality.toString())
          }

          if (this.audio.filters) {
            options.push('-filter:a', generateFilterChain(this.audio.filters))
          }
        }

        return options
      }

      #getVideoOptions(): string[] {
        let options: string[] = []

        if (this.video === false) {
          options.push('-vn')
        } else if (this.video) {
          if (this.video.codec) {
            options.push('-vcodec', this.video.codec)
          }

          if (this.video.bitrate) {
            let bitrate = formatBitrate(this.video.bitrate)
            options.push('-b:v', bitrate)

            if (this.video.constantBitrate) {
              options.push(
                '-minrate',
                bitrate,
                '-maxrate',
                bitrate,
                '-bufsize',
                bitrate
              )
            }
          }

          if (this.video.fps) {
            options.push('-r', this.video.fps.toString())
          }

          if (this.video.frames) {
            options.push('-vframes', this.video.frames.toString())
          }

          if (this.video.filters) {
            options.push('-filter:v', generateFilterChain(this.video.filters))
          }

          // todo size filters
        }

        return options
      }

      #getOptions(): string[] {
        let options: string[] = []

        if (this.seek) {
          options.push('-ss', this.seek.toString())
        }

        if (this.duration) {
          options.push('-t', this.duration.toString())
        }

        if (this.format) {
          options.push('-f', this.format)
        }

        if (this.map) {
          options.push('-map', this.map)
        }

        return options
      }

      #getOutputString(): string {
        if (typeof this.target === 'string') {
          return this.target
        } else {
          return 'pipe:1'
        }
      }

      getFfmpegArguments(): string[] {
        return [
          ...this.#getAudioOptions(),
          ...this.#getVideoOptions(),
          ...this.#getOptions(),
          ...this.customArgs,
          this.#getOutputString()
        ]
      }
    }