1 files changed, 176 insertions, 0 deletions
diff --git a/MediaBrowser.Providers/MediaInfo/AudioResolver.cs b/MediaBrowser.Providers/MediaInfo/AudioResolver.cs
new file mode 100644
index 000000000..425913501
--- /dev/null
+++ b/MediaBrowser.Providers/MediaInfo/AudioResolver.cs
@@ -0,0 +1,176 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Threading;
+using System.Threading.Tasks;
+using Emby.Naming.Audio;
+using Emby.Naming.Common;
+using Jellyfin.Extensions;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.MediaEncoding;
+using MediaBrowser.Controller.Providers;
+using MediaBrowser.Model.Dlna;
+using MediaBrowser.Model.Dto;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Globalization;
+using MediaBrowser.Model.MediaInfo;
+
+namespace MediaBrowser.Providers.MediaInfo
+{
+    /// <summary>
+    /// Resolves external audios for videos.
+    /// </summary>
+    public class AudioResolver
+    {
+        private readonly ILocalizationManager _localizationManager;
+        private readonly IMediaEncoder _mediaEncoder;
+        private readonly NamingOptions _namingOptions;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AudioResolver"/> class.
+        /// </summary>
+        /// <param name="localizationManager">The localization manager.</param>
+        /// <param name="mediaEncoder">The media encoder.</param>
+        /// <param name="namingOptions">The naming options.</param>
+        public AudioResolver(
+            ILocalizationManager localizationManager,
+            IMediaEncoder mediaEncoder,
+            NamingOptions namingOptions)
+        {
+            _localizationManager = localizationManager;
+            _mediaEncoder = mediaEncoder;
+            _namingOptions = namingOptions;
+        }
+
+        /// <summary>
+        /// Returns the audio streams found in the external audio files for the given video.
+        /// </summary>
+        /// <param name="video">The video to get the external audio streams from.</param>
+        /// <param name="startIndex">The stream index to start adding audio streams at.</param>
+        /// <param name="directoryService">The directory service to search for files.</param>
+        /// <param name="clearCache">True if the directory service cache should be cleared before searching.</param>
+        /// <param name="cancellationToken">The cancellation token to cancel operation.</param>
+        /// <returns>A list of external audio streams.</returns>
+        public async IAsyncEnumerable<MediaStream> GetExternalAudioStreams(
+            Video video,
+            int startIndex,
+            IDirectoryService directoryService,
+            bool clearCache,
+            [EnumeratorCancellation] CancellationToken cancellationToken)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            if (!video.IsFileProtocol)
+            {
+                yield break;
+            }
+
+            IEnumerable<string> paths = GetExternalAudioFiles(video, directoryService, clearCache);
+            foreach (string path in paths)
+            {
+                string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(path);
+                Model.MediaInfo.MediaInfo mediaInfo = await GetMediaInfo(path, cancellationToken).ConfigureAwait(false);
+
+                foreach (MediaStream mediaStream in mediaInfo.MediaStreams)
+                {
+                    mediaStream.Index = startIndex++;
+                    mediaStream.Type = MediaStreamType.Audio;
+                    mediaStream.IsExternal = true;
+                    mediaStream.Path = path;
+                    mediaStream.IsDefault = false;
+                    mediaStream.Title = null;
+
+                    if (string.IsNullOrEmpty(mediaStream.Language))
+                    {
+                        // Try to translate to three character code
+                        // Be flexible and check against both the full and three character versions
+                        var language = StringExtensions.RightPart(fileNameWithoutExtension, '.').ToString();
+
+                        if (language != fileNameWithoutExtension)
+                        {
+                            var culture = _localizationManager.FindLanguageInfo(language);
+
+                            language = culture == null ? language : culture.ThreeLetterISOLanguageName;
+                            mediaStream.Language = language;
+                        }
+                    }
+
+                    yield return mediaStream;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Returns the external audio file paths for the given video.
+        /// </summary>
+        /// <param name="video">The video to get the external audio file paths from.</param>
+        /// <param name="directoryService">The directory service to search for files.</param>
+        /// <param name="clearCache">True if the directory service cache should be cleared before searching.</param>
+        /// <returns>A list of external audio file paths.</returns>
+        public IEnumerable<string> GetExternalAudioFiles(
+            Video video,
+            IDirectoryService directoryService,
+            bool clearCache)
+        {
+            if (!video.IsFileProtocol)
+            {
+                yield break;
+            }
+
+            // Check if video folder exists
+            string folder = video.ContainingFolderPath;
+            if (!Directory.Exists(folder))
+            {
+                yield break;
+            }
+
+            string videoFileNameWithoutExtension = Path.GetFileNameWithoutExtension(video.Path);
+
+            var files = directoryService.GetFilePaths(folder, clearCache, true);
+            for (int i = 0; i < files.Count; i++)
+            {
+                string file = files[i];
+                if (string.Equals(video.Path, file, StringComparison.OrdinalIgnoreCase)
+                    || !AudioFileParser.IsAudioFile(file, _namingOptions)
+                    || Path.GetExtension(file.AsSpan()).Equals(".strm", StringComparison.OrdinalIgnoreCase))
+                {
+                    continue;
+                }
+
+                string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(file);
+                // The audio filename must either be equal to the video filename or start with the video filename followed by a dot
+                if (videoFileNameWithoutExtension.Equals(fileNameWithoutExtension, StringComparison.OrdinalIgnoreCase)
+                    || (fileNameWithoutExtension.Length > videoFileNameWithoutExtension.Length
+                        && fileNameWithoutExtension[videoFileNameWithoutExtension.Length] == '.'
+                        && fileNameWithoutExtension.StartsWith(videoFileNameWithoutExtension, StringComparison.OrdinalIgnoreCase)))
+                {
+                    yield return file;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Returns the media info of the given audio file.
+        /// </summary>
+        /// <param name="path">The path to the audio file.</param>
+        /// <param name="cancellationToken">The cancellation token to cancel operation.</param>
+        /// <returns>The media info for the given audio file.</returns>
+        private Task<Model.MediaInfo.MediaInfo> GetMediaInfo(string path, CancellationToken cancellationToken)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            return _mediaEncoder.GetMediaInfo(
+                new MediaInfoRequest
+                {
+                    MediaType = DlnaProfileType.Audio,
+                    MediaSource = new MediaSourceInfo
+                    {
+                        Path = path,
+                        Protocol = MediaProtocol.File
+                    }
+                },
+                cancellationToken);
+        }
+    }
+}