# All files / src capabilities.ts

75.34% Statements 55/73
85.71% Branches 6/7
57.14% Functions 4/7
75.34% Lines 55/73

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     import { FfmpegProcess } from './process'
    import {
      FfmpegCodecs,
      FfmpegEncoders,
      FfmpegFilters,
      FfmpegFormats
    } from './utils/data-types'
    import {
      extractCodecs,
      extractEncoders,
      extractFilters,
      extractFormats
    } from './utils/parsing'
    import { nlRegexp } from './utils/regexp'

    export class FfmpegCapabilities {
      #codecs: FfmpegCodecs | null = null
      #formats: FfmpegFormats | null = null
      #filters: FfmpegFilters | null = null
      #encoders: FfmpegEncoders | null = null
      #decoders: FfmpegEncoders | null = null

      private async getLines(arg: string): Promise<string[]> {
        let { stdout } = await new FfmpegProcess({
          args: [arg],
          captureStdout: true
        }).run()

        return stdout.split(nlRegexp) || []
      }

      async codecs() {
        // TODO note: if we ever check codecs, "copy" is also an option for output codec

        if (!this.#codecs) {
          this.#codecs = extractCodecs(await this.getLines('-codecs'))
        }

        return this.#codecs
      }

      async formats() {
        if (!this.#formats) {
          this.#formats = extractFormats(await this.getLines('-formats'))
        }

        return this.#formats
      }

      async filters() {
        if (!this.#filters) {
          this.#filters = extractFilters(await this.getLines('-filters'))
        }

        return this.#filters
      }

      async encoders() {
        if (!this.#encoders) {
          this.#encoders = extractEncoders(await this.getLines('-encoders'))
        }

        return this.#encoders
      }

      async decoders() {
        if (!this.#decoders) {
          this.#decoders = extractEncoders(await this.getLines('-decoders'))
        }

        return this.#decoders
      }
    }