jsmediatags/build2/ID3v1TagReader.js

Media Tags Reader (ID3, MP4)

'use strict';

function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }

function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }

function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

var MediaTagReader = require('./MediaTagReader');

var MediaFileReader = require('./MediaFileReader');

var ID3v1TagReader = /*#__PURE__*/function (_MediaTagReader) {
  _inherits(ID3v1TagReader, _MediaTagReader);

  var _super = _createSuper(ID3v1TagReader);

  function ID3v1TagReader() {
    _classCallCheck(this, ID3v1TagReader);

    return _super.apply(this, arguments);
  }

  _createClass(ID3v1TagReader, [{
    key: "_loadData",
    value: function _loadData(mediaFileReader, callbacks) {
      var fileSize = mediaFileReader.getSize();
      mediaFileReader.loadRange([fileSize - 128, fileSize - 1], callbacks);
    }
  }, {
    key: "_parseData",
    value: function _parseData(data, tags) {
      var offset = data.getSize() - 128;
      var title = data.getStringWithCharsetAt(offset + 3, 30).toString();
      var artist = data.getStringWithCharsetAt(offset + 33, 30).toString();
      var album = data.getStringWithCharsetAt(offset + 63, 30).toString();
      var year = data.getStringWithCharsetAt(offset + 93, 4).toString();
      var trackFlag = data.getByteAt(offset + 97 + 28);
      var track = data.getByteAt(offset + 97 + 29);

      if (trackFlag == 0 && track != 0) {
        var version = "1.1";
        var comment = data.getStringWithCharsetAt(offset + 97, 28).toString();
      } else {
        var version = "1.0";
        var comment = data.getStringWithCharsetAt(offset + 97, 30).toString();
        track = 0;
      }

      var genreIdx = data.getByteAt(offset + 97 + 30);

      if (genreIdx < 255) {
        var genre = GENRES[genreIdx];
      } else {
        var genre = "";
      }

      var tag = {
        "type": "ID3",
        "version": version,
        "tags": {
          "title": title,
          "artist": artist,
          "album": album,
          "year": year,
          "comment": comment,
          "genre": genre
        }
      };

      if (track) {
        // $FlowIssue - flow is not happy with adding properties
        tag.tags.track = track;
      }

      return tag;
    }
  }], [{
    key: "getTagIdentifierByteRange",
    value: function getTagIdentifierByteRange() {
      // The identifier is TAG and is at offset: -128. However, to avoid a
      // fetch for the tag identifier and another for the data, we load the
      // entire data since it's so small.
      return {
        offset: -128,
        length: 128
      };
    }
  }, {
    key: "canReadTagFormat",
    value: function canReadTagFormat(tagIdentifier) {
      var id = String.fromCharCode.apply(String, tagIdentifier.slice(0, 3));
      return id === "TAG";
    }
  }]);

  return ID3v1TagReader;
}(MediaTagReader);

var GENRES = ["Blues", "Classic Rock", "Country", "Dance", "Disco", "Funk", "Grunge", "Hip-Hop", "Jazz", "Metal", "New Age", "Oldies", "Other", "Pop", "R&B", "Rap", "Reggae", "Rock", "Techno", "Industrial", "Alternative", "Ska", "Death Metal", "Pranks", "Soundtrack", "Euro-Techno", "Ambient", "Trip-Hop", "Vocal", "Jazz+Funk", "Fusion", "Trance", "Classical", "Instrumental", "Acid", "House", "Game", "Sound Clip", "Gospel", "Noise", "AlternRock", "Bass", "Soul", "Punk", "Space", "Meditative", "Instrumental Pop", "Instrumental Rock", "Ethnic", "Gothic", "Darkwave", "Techno-Industrial", "Electronic", "Pop-Folk", "Eurodance", "Dream", "Southern Rock", "Comedy", "Cult", "Gangsta", "Top 40", "Christian Rap", "Pop/Funk", "Jungle", "Native American", "Cabaret", "New Wave", "Psychadelic", "Rave", "Showtunes", "Trailer", "Lo-Fi", "Tribal", "Acid Punk", "Acid Jazz", "Polka", "Retro", "Musical", "Rock & Roll", "Hard Rock", "Folk", "Folk-Rock", "National Folk", "Swing", "Fast Fusion", "Bebob", "Latin", "Revival", "Celtic", "Bluegrass", "Avantgarde", "Gothic Rock", "Progressive Rock", "Psychedelic Rock", "Symphonic Rock", "Slow Rock", "Big Band", "Chorus", "Easy Listening", "Acoustic", "Humour", "Speech", "Chanson", "Opera", "Chamber Music", "Sonata", "Symphony", "Booty Bass", "Primus", "Porn Groove", "Satire", "Slow Jam", "Club", "Tango", "Samba", "Folklore", "Ballad", "Power Ballad", "Rhythmic Soul", "Freestyle", "Duet", "Punk Rock", "Drum Solo", "Acapella", "Euro-House", "Dance Hall"];
module.exports = ID3v1TagReader;