/**
 * Specialized audio metadata properties.
 * Includes MusicBrainz IDs, ReplayGain values, AcoustID fingerprints, and Apple Sound Check.
 */
export declare const SPECIALIZED_PROPERTIES: {
    readonly musicbrainzArtistId: {
        readonly key: "MUSICBRAINZ_ARTISTID";
        readonly description: "MusicBrainz Artist ID (UUID)";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "MusicBrainz Artist Id";
            };
            readonly vorbis: "MUSICBRAINZ_ARTISTID";
            readonly mp4: "----:com.apple.iTunes:MusicBrainz Artist Id";
        };
    };
    readonly musicbrainzReleaseId: {
        readonly key: "MUSICBRAINZ_ALBUMID";
        readonly description: "MusicBrainz Release ID (UUID)";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "MusicBrainz Album Id";
            };
            readonly vorbis: "MUSICBRAINZ_ALBUMID";
            readonly mp4: "----:com.apple.iTunes:MusicBrainz Album Id";
        };
    };
    readonly musicbrainzTrackId: {
        readonly key: "MUSICBRAINZ_TRACKID";
        readonly description: "MusicBrainz Recording ID (UUID)";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "UFID";
                readonly description: "http://musicbrainz.org";
            };
            readonly vorbis: "MUSICBRAINZ_TRACKID";
            readonly mp4: "----:com.apple.iTunes:MusicBrainz Track Id";
        };
    };
    readonly musicbrainzReleaseGroupId: {
        readonly key: "MUSICBRAINZ_RELEASEGROUPID";
        readonly description: "MusicBrainz Release Group ID (UUID)";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "MusicBrainz Release Group Id";
            };
            readonly vorbis: "MUSICBRAINZ_RELEASEGROUPID";
            readonly mp4: "----:com.apple.iTunes:MusicBrainz Release Group Id";
        };
    };
    readonly replayGainTrackGain: {
        readonly key: "REPLAYGAIN_TRACK_GAIN";
        readonly description: "ReplayGain track gain in dB (e.g., '-6.54 dB')";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "ReplayGain_Track_Gain";
            };
            readonly vorbis: "REPLAYGAIN_TRACK_GAIN";
            readonly mp4: "----:com.apple.iTunes:replaygain_track_gain";
        };
    };
    readonly replayGainTrackPeak: {
        readonly key: "REPLAYGAIN_TRACK_PEAK";
        readonly description: "ReplayGain track peak value (0.0-1.0)";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "ReplayGain_Track_Peak";
            };
            readonly vorbis: "REPLAYGAIN_TRACK_PEAK";
            readonly mp4: "----:com.apple.iTunes:replaygain_track_peak";
        };
    };
    readonly replayGainAlbumGain: {
        readonly key: "REPLAYGAIN_ALBUM_GAIN";
        readonly description: "ReplayGain album gain in dB";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "ReplayGain_Album_Gain";
            };
            readonly vorbis: "REPLAYGAIN_ALBUM_GAIN";
            readonly mp4: "----:com.apple.iTunes:replaygain_album_gain";
        };
    };
    readonly replayGainAlbumPeak: {
        readonly key: "REPLAYGAIN_ALBUM_PEAK";
        readonly description: "ReplayGain album peak value (0.0-1.0)";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "ReplayGain_Album_Peak";
            };
            readonly vorbis: "REPLAYGAIN_ALBUM_PEAK";
            readonly mp4: "----:com.apple.iTunes:replaygain_album_peak";
        };
    };
    readonly acoustidFingerprint: {
        readonly key: "ACOUSTID_FINGERPRINT";
        readonly description: "AcoustID fingerprint (Chromaprint)";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "Acoustid Fingerprint";
            };
            readonly vorbis: "ACOUSTID_FINGERPRINT";
            readonly mp4: "----:com.apple.iTunes:Acoustid Fingerprint";
        };
    };
    readonly acoustidId: {
        readonly key: "ACOUSTID_ID";
        readonly description: "AcoustID UUID";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "Acoustid Id";
            };
            readonly vorbis: "ACOUSTID_ID";
            readonly mp4: "----:com.apple.iTunes:Acoustid Id";
        };
    };
    readonly appleSoundCheck: {
        readonly key: "ITUNNORM";
        readonly description: "Apple Sound Check normalization data";
        readonly type: "string";
        readonly supportedFormats: readonly ["ID3v2", "MP4", "Vorbis"];
        readonly mappings: {
            readonly id3v2: {
                readonly frame: "TXXX";
                readonly description: "iTunNORM";
            };
            readonly vorbis: "ITUNNORM";
            readonly mp4: "----:com.apple.iTunes:iTunNORM";
        };
    };
};
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