YouTube.js/src/parser/classes/PlayerCaptionsTracklist.ts

import Text from './misc/Text.js';
import { YTNode } from '../helpers.js';
import type { RawNode } from '../index.js';

export interface CaptionTrackData {
  base_url: string;
  name: Text;
  vss_id: string;
  language_code: string;
  kind?: 'asr' | 'frc';
  is_translatable: boolean;
}

export default class PlayerCaptionsTracklist extends YTNode {
  static type = 'PlayerCaptionsTracklist';

  caption_tracks?: CaptionTrackData[];

  audio_tracks?: {
    audio_track_id: string;
    captions_initial_state: string;
    default_caption_track_index?: number;
    has_default_track: boolean;
    visibility: string;
    caption_track_indices: number[];
  }[];

  default_audio_track_index?: number;

  translation_languages?: {
    language_code: string;
    language_name: Text;
  }[];

  constructor(data: RawNode) {
    super();
    if (Reflect.has(data, 'captionTracks')) {
      this.caption_tracks = data.captionTracks.map((ct: any) => ({
        base_url: ct.baseUrl,
        name: new Text(ct.name),
        vss_id: ct.vssId,
        language_code: ct.languageCode,
        kind: ct.kind,
        is_translatable: ct.isTranslatable
      }));
    }

    if (Reflect.has(data, 'audioTracks')) {
      this.audio_tracks = data.audioTracks.map((at: any) => ({
        audio_track_id: at.audioTrackId,
        captions_initial_state: at.captionsInitialState,
        default_caption_track_index: at.defaultCaptionTrackIndex,
        has_default_track: at.hasDefaultTrack,
        visibility: at.visibility,
        caption_track_indices: at.captionTrackIndices
      }));
    }

    if (Reflect.has(data, 'defaultAudioTrackIndex')) {
      this.default_audio_track_index = data.defaultAudioTrackIndex;
    }

    if (Reflect.has(data, 'translationLanguages')) {
      this.translation_languages = data.translationLanguages.map((tl: any) => ({
        language_code: tl.languageCode,
        language_name: new Text(tl.languageName)
      }));
    }
  }
}