# All files / src/utils parsing.ts

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     import {
      FfmpegCodec,
      FfmpegCodecType,
      FfmpegCodecs,
      FfmpegEncoderType,
      FfmpegEncoders,
      FfmpegFilterStreamType,
      FfmpegFilters,
      FfmpegFormats,
      InputCodecInformation,
      InputStreamCodecInformation,
      ProgressInformation
    } from './data-types'

    import {
      capCodecDecodersRegexp,
      capCodecEncodersRegexp,
      capCodecRegexp,
      capEncoderRegexp,
      capFilterRegexp,
      capFormatRegexp,
      codecAudioRegexp,
      codecDurRegexp,
      codecEndRegexp,
      codecInputRegexp,
      codecOutputRegexp,
      codecVideoRegexp
    } from './regexp'

    /**
     * Extract an error message from ffmpeg stderr
     *
     * @param stderrLines stderr output from ffmpeg as an array of lines
     * @returns error message
     */
    export function extractErrorMessage(stderrLines: string[]): string {
      // Return the last block of lines that don't start with a space or square bracket
      return stderrLines
        .reduce((messages: string[], message: string): string[] => {
          if (message.charAt(0) === ' ' || message.charAt(0) === '[') {
            return []
          } else {
            messages.push(message)
            return messages
          }
        }, [])
        .join('\n')
    }

    /**
     * Extract progress information from ffmpeg stderr
     *
     * @param stderrLine a line from ffmpeg stderr
     * @returns progress information
     */
    export function extractProgress(
      stderrLine: string
    ): ProgressInformation | undefined {
      let parts = stderrLine.replace(/=\s+/g, '=').trim().split(' ')
      let progress: ProgressInformation = {}

      for (let part of parts) {
        let [key, value] = part.split('=', 2)

        if (value === undefined) {
          // Not a progress line
          return
        }

        if (key === 'frame' || key === 'fps') {
          progress[key] = Number(value)
        } else if (key === 'bitrate') {
          progress.bitrate = Number(value.replace('kbits/s', ''))
        } else if (key === 'size' || key === 'Lsize') {
          progress.size = Number(value.replace('kB', ''))
        } else if (key === 'time') {
          progress.time = value
        } else if (key === 'speed') {
          progress.speed = Number(value.replace('x', ''))
        }
      }

      return progress
    }

    export class CodecDataExtractor {
      inputs: InputStreamCodecInformation[]
      index: number
      inInput: boolean
      done: boolean
      callback: (data: InputCodecInformation) => any

      constructor(callback: (data: InputCodecInformation) => any) {
        this.inputs = []
        this.index = -1
        this.inInput = false
        this.done = false
        this.callback = callback
      }

      // TODO better output for multiple inputs / multi-stream inputs !
      processLine(line: string) {
        let matchFormat = line.match(codecInputRegexp)
        if (matchFormat) {
          this.inInput = true
          this.index++
          this.inputs[this.index] = {
            format: matchFormat[1]
          }

          return
        }

        if (this.inInput) {
          let durationMatch = line.match(codecDurRegexp)
          if (durationMatch) {
            this.inputs[this.index].duration = durationMatch[1]
            return
          }

          let audioMatch = line.match(codecAudioRegexp)
          if (audioMatch) {
            this.inputs[this.index].audio = audioMatch[1].split(', ')[0]
            this.inputs[this.index].audioDetails = audioMatch[1]
            return
          }

          let videoMatch = line.match(codecVideoRegexp)
          if (videoMatch) {
            this.inputs[this.index].video = videoMatch[1].split(', ')[0]
            this.inputs[this.index].videoDetails = videoMatch[1]
            return
          }
        }

        if (codecOutputRegexp.test(line)) {
          this.inInput = false
        }

        if (codecEndRegexp.test(line)) {
          this.done = true
          let { callback } = this

          callback(this.inputs)
        }
      }
    }

    function parseCodecType(type: string): FfmpegCodecType {
      if (type === 'A') return 'audio'
      if (type === 'V') return 'video'
      if (type === 'S') return 'subtitle'
      if (type === 'D') return 'data'
      return 'attachment'
    }

    export function extractCodecs(lines: string[]): FfmpegCodecs {
      let codecs: FfmpegCodecs = {}

      for (let line of lines) {
        let match = line.match(capCodecRegexp)
        if (match) {
          let [, decode, encode, type, intra, lossy, lossless, name, description] =
            match

          let codec: FfmpegCodec = {
            description,
            type: parseCodecType(type),
            canEncode: encode === 'E',
            canDecode: decode === 'D',
            intraFrame: intra === 'I',
            lossy: lossy === 'L',
            lossless: lossless === 'S'
          }

          if (decode === 'D') {
            let decoders = description.match(capCodecDecodersRegexp)
            if (decoders) {
              codec.decoders = decoders[1].trim().split(' ')
              codec.description = codec.description
                .replace(capCodecDecodersRegexp, '')
                .trim()
            }
          }

          if (encode === 'E') {
            let encoders = description.match(capCodecEncodersRegexp)
            if (encoders) {
              codec.encoders = encoders[1].trim().split(' ')
              codec.description = codec.description
                .replace(capCodecEncodersRegexp, '')
                .trim()
            }
          }

          codecs[name] = codec
        }
      }

      return codecs
    }

    export function extractFormats(lines: string[]): FfmpegFormats {
      let formats: FfmpegFormats = {}

      for (let line of lines) {
        let match = line.match(capFormatRegexp)
        if (match) {
          let [, demux, mux, name, description] = match
          formats[name] = {
            description,
            canMux: mux === 'E',
            canDemux: demux === 'D'
          }
        }
      }

      return formats
    }

    function parseFilterStreams(
      streams: string
    ): FfmpegFilterStreamType[] | 'dynamic' {
      if (streams === '|') {
        return []
      } else if (streams === 'N') {
        return 'dynamic'
      } else {
        return [...streams].map((s) => (s === 'A' ? 'audio' : 'video'))
      }
    }

    export function extractFilters(lines: string[]): FfmpegFilters {
      let filters: FfmpegFilters = {}

      for (let line of lines) {
        let match = line.match(capFilterRegexp)
        if (match) {
          let [, timeline, slice, command, name, inputs, outputs, description] =
            match

          filters[name] = {
            description,
            inputs: parseFilterStreams(inputs),
            outputs: parseFilterStreams(outputs)
          }
        }
      }

      return filters
    }

    function parseEncoderType(type: string): FfmpegEncoderType {
      if (type === 'A') return 'audio'
      if (type === 'V') return 'video'
      return 'subtitle'
    }

    export function extractEncoders(lines: string[]): FfmpegEncoders {
      let encoders: FfmpegEncoders = {}

      for (let line of lines) {
        let match = line.match(capEncoderRegexp)
        if (match) {
          let [, type, frame, slice, exp, band, direct, name, description] = match

          encoders[name] = {
            description,
            type: parseEncoderType(type),
            frameMultithreading: frame === 'F',
            sliceMultithreading: slice === 'S',
            experimental: exp === 'X',
            drawHorizBand: band === 'B',
            directRendering: direct === 'D'
          }
        }
      }

      return encoders
    }