videos: move 'Caption' and associated global/functions to a separate file

src/invidious/videos/caption.cr

@@ -0,0 +1,168 @@
+require "json"
+
+module Invidious::Videos
+  struct Caption
+    property name : String
+    property language_code : String
+    property base_url : String
+
+    def initialize(@name, @language_code, @base_url)
+    end
+
+    # Parse the JSON structure from Youtube
+    def self.from_yt_json(container : JSON::Any) : Array(Caption)
+      caption_tracks = container
+        .dig?("playerCaptionsTracklistRenderer", "captionTracks")
+        .try &.as_a
+
+      captions_list = [] of Caption
+      return captions_list if caption_tracks.nil?
+
+      caption_tracks.each do |caption|
+        name = caption["name"]["simpleText"]? || caption["name"]["runs"][0]["text"]
+        name = name.to_s.split(" - ")[0]
+
+        language_code = caption["languageCode"].to_s
+        base_url = caption["baseUrl"].to_s
+
+        captions_list << Caption.new(name, language_code, base_url)
+      end
+
+      return captions_list
+    end
+
+    # List of all caption languages available on Youtube.
+    LANGUAGES = {
+      "",
+      "English",
+      "English (auto-generated)",
+      "English (United Kingdom)",
+      "English (United States)",
+      "Afrikaans",
+      "Albanian",
+      "Amharic",
+      "Arabic",
+      "Armenian",
+      "Azerbaijani",
+      "Bangla",
+      "Basque",
+      "Belarusian",
+      "Bosnian",
+      "Bulgarian",
+      "Burmese",
+      "Cantonese (Hong Kong)",
+      "Catalan",
+      "Cebuano",
+      "Chinese",
+      "Chinese (China)",
+      "Chinese (Hong Kong)",
+      "Chinese (Simplified)",
+      "Chinese (Taiwan)",
+      "Chinese (Traditional)",
+      "Corsican",
+      "Croatian",
+      "Czech",
+      "Danish",
+      "Dutch",
+      "Dutch (auto-generated)",
+      "Esperanto",
+      "Estonian",
+      "Filipino",
+      "Finnish",
+      "French",
+      "French (auto-generated)",
+      "Galician",
+      "Georgian",
+      "German",
+      "German (auto-generated)",
+      "Greek",
+      "Gujarati",
+      "Haitian Creole",
+      "Hausa",
+      "Hawaiian",
+      "Hebrew",
+      "Hindi",
+      "Hmong",
+      "Hungarian",
+      "Icelandic",
+      "Igbo",
+      "Indonesian",
+      "Indonesian (auto-generated)",
+      "Interlingue",
+      "Irish",
+      "Italian",
+      "Italian (auto-generated)",
+      "Japanese",
+      "Japanese (auto-generated)",
+      "Javanese",
+      "Kannada",
+      "Kazakh",
+      "Khmer",
+      "Korean",
+      "Korean (auto-generated)",
+      "Kurdish",
+      "Kyrgyz",
+      "Lao",
+      "Latin",
+      "Latvian",
+      "Lithuanian",
+      "Luxembourgish",
+      "Macedonian",
+      "Malagasy",
+      "Malay",
+      "Malayalam",
+      "Maltese",
+      "Maori",
+      "Marathi",
+      "Mongolian",
+      "Nepali",
+      "Norwegian Bokmål",
+      "Nyanja",
+      "Pashto",
+      "Persian",
+      "Polish",
+      "Portuguese",
+      "Portuguese (auto-generated)",
+      "Portuguese (Brazil)",
+      "Punjabi",
+      "Romanian",
+      "Russian",
+      "Russian (auto-generated)",
+      "Samoan",
+      "Scottish Gaelic",
+      "Serbian",
+      "Shona",
+      "Sindhi",
+      "Sinhala",
+      "Slovak",
+      "Slovenian",
+      "Somali",
+      "Southern Sotho",
+      "Spanish",
+      "Spanish (auto-generated)",
+      "Spanish (Latin America)",
+      "Spanish (Mexico)",
+      "Spanish (Spain)",
+      "Sundanese",
+      "Swahili",
+      "Swedish",
+      "Tajik",
+      "Tamil",
+      "Telugu",
+      "Thai",
+      "Turkish",
+      "Turkish (auto-generated)",
+      "Ukrainian",
+      "Urdu",
+      "Uzbek",
+      "Vietnamese",
+      "Vietnamese (auto-generated)",
+      "Welsh",
+      "Western Frisian",
+      "Xhosa",
+      "Yiddish",
+      "Yoruba",
+      "Zulu",
+    }
+  end
+end