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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);
}
}
}
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