jellyfin/MediaBrowser.Movies/Resolvers/MovieResolver.cs

using System.ComponentModel.Composition;
using MediaBrowser.Controller.IO;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Resolvers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Movies.Entities;

namespace MediaBrowser.Movies.Resolvers
{
    [Export(typeof(IBaseItemResolver))]
    public class MovieResolver : BaseVideoResolver<Movie>
    {
        protected override Movie Resolve(ItemResolveEventArgs args)
        {
            // Must be a directory and under a 'Movies' VF
            if (args.IsDirectory)
            {
                // If the parent is not a boxset, the only other allowed parent type is Folder		
                if (!(args.Parent is BoxSet))
                {
                    if (args.Parent != null && args.Parent.GetType() != typeof(Folder))
                    {
                        return null;
                    }
                }

                // Return a movie if the video resolver finds something in the folder
                return GetMovie(args);
            }

            return null;
        }

        protected override void SetInitialItemValues(Movie item, ItemResolveEventArgs args)
        {
            base.SetInitialItemValues(item, args);

            SetProviderIdFromPath(item);
        }

        private void SetProviderIdFromPath(Movie item)
        {
            string srch = "[tmdbid=";
            int index = item.Path.IndexOf(srch, System.StringComparison.OrdinalIgnoreCase);

            if (index != -1)
            {
                string id = item.Path.Substring(index + srch.Length);

                id = id.Substring(0, id.IndexOf(']'));

                item.SetProviderId(MetadataProviders.Tmdb, id);
            }
        }

        private Movie GetMovie(ItemResolveEventArgs args)
        {
            // Loop through each child file/folder and see if we find a video
            for (var i = 0; i < args.FileSystemChildren.Length; i++)
            {
                var child = args.FileSystemChildren[i];

                ItemResolveEventArgs childArgs = new ItemResolveEventArgs()
                {
                    FileInfo = child,
                    FileSystemChildren = new WIN32_FIND_DATA[] { },
                    Path = child.Path
                };

                var item = base.Resolve(childArgs);

                if (item != null)
                {
                    return new Movie()
                    {
                        Path = item.Path,
                        VideoType = item.VideoType
                    };
                }
            }

            return null;
        }
    }
}