lidarr/src/NzbDrone.Core/MediaFiles/MediaFileExtensions.cs

using System.Collections.Generic;
using NzbDrone.Core.Qualities;


namespace NzbDrone.Core.MediaFiles
{
    public static class MediaFileExtensions
    {
        private static Dictionary<string, Quality> _fileExtensions;

        static MediaFileExtensions()
        {
            _fileExtensions = new Dictionary<string, Quality>
            {
                { ".mp3", Quality.Unknown },
                { ".m4a", Quality.Unknown },
                { ".ogg", Quality.Unknown },
                { ".flac", Quality.FLAC },
            };
        }

        public static HashSet<string> Extensions => new HashSet<string>(_fileExtensions.Keys);

        public static Quality GetQualityForExtension(string extension)
        {
            if (_fileExtensions.ContainsKey(extension))
            {
                return _fileExtensions[extension];
            }

            return Quality.Unknown;
        }
    }
}