jellyfin/MediaBrowser.Providers/MediaInfo/SubtitleResolver.cs
2021-05-16 20:16:47 +02:00

203 lines
7.4 KiB
C#

#pragma warning disable CS1591
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Globalization;
namespace MediaBrowser.Providers.MediaInfo
{
public class SubtitleResolver
{
private readonly ILocalizationManager _localization;
public SubtitleResolver(ILocalizationManager localization)
{
_localization = localization;
}
public List<MediaStream> GetExternalSubtitleStreams(
Video video,
int startIndex,
IDirectoryService directoryService,
bool clearCache)
{
var streams = new List<MediaStream>();
if (!video.IsFileProtocol)
{
return streams;
}
AddExternalSubtitleStreams(streams, video.ContainingFolderPath, video.Path, startIndex, directoryService, clearCache);
startIndex += streams.Count;
string folder = video.GetInternalMetadataPath();
if (!Directory.Exists(folder))
{
return streams;
}
try
{
AddExternalSubtitleStreams(streams, folder, video.Path, startIndex, directoryService, clearCache);
}
catch (IOException)
{
}
return streams;
}
public List<string> GetExternalSubtitleFiles(
Video video,
IDirectoryService directoryService,
bool clearCache)
{
var list = new List<string>();
if (!video.IsFileProtocol)
{
return list;
}
var streams = GetExternalSubtitleStreams(video, 0, directoryService, clearCache);
foreach (var stream in streams)
{
list.Add(stream.Path);
}
return list;
}
public void AddExternalSubtitleStreams(
List<MediaStream> streams,
string videoPath,
int startIndex,
string[] files)
{
var videoFileNameWithoutExtension = NormalizeFilenameForSubtitleComparison(videoPath);
foreach (var fullName in files)
{
var extension = Path.GetExtension(fullName.AsSpan());
if (!IsSubtitleExtension(extension))
{
continue;
}
var fileNameWithoutExtension = NormalizeFilenameForSubtitleComparison(fullName);
MediaStream mediaStream;
// The subtitle 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))
{
mediaStream = new MediaStream
{
Index = startIndex++,
Type = MediaStreamType.Subtitle,
IsExternal = true,
Path = fullName
};
}
else if (fileNameWithoutExtension.Length > videoFileNameWithoutExtension.Length
&& fileNameWithoutExtension[videoFileNameWithoutExtension.Length] == '.'
&& fileNameWithoutExtension.StartsWith(videoFileNameWithoutExtension, StringComparison.OrdinalIgnoreCase))
{
var isForced = fullName.Contains(".forced.", StringComparison.OrdinalIgnoreCase)
|| fullName.Contains(".foreign.", StringComparison.OrdinalIgnoreCase);
var isDefault = fullName.Contains(".default.", StringComparison.OrdinalIgnoreCase);
// Support xbmc naming conventions - 300.spanish.srt
var languageSpan = fileNameWithoutExtension;
while (languageSpan.Length > 0)
{
var lastDot = languageSpan.LastIndexOf('.');
var currentSlice = languageSpan[lastDot..];
if (currentSlice.Equals(".default", StringComparison.OrdinalIgnoreCase)
|| currentSlice.Equals(".forced", StringComparison.OrdinalIgnoreCase)
|| currentSlice.Equals(".foreign", StringComparison.OrdinalIgnoreCase))
{
languageSpan = languageSpan[..lastDot];
continue;
}
languageSpan = languageSpan[(lastDot + 1)..];
break;
}
var language = languageSpan.ToString();
// Try to translate to three character code
// Be flexible and check against both the full and three character versions
var culture = _localization.FindLanguageInfo(language);
if (culture != null)
{
language = culture.ThreeLetterISOLanguageName;
}
mediaStream = new MediaStream
{
Index = startIndex++,
Type = MediaStreamType.Subtitle,
IsExternal = true,
Path = fullName,
Language = language,
IsForced = isForced,
IsDefault = isDefault
};
}
else
{
continue;
}
mediaStream.Codec = extension.TrimStart('.').ToString().ToLowerInvariant();
streams.Add(mediaStream);
}
}
private static bool IsSubtitleExtension(ReadOnlySpan<char> extension)
{
return extension.Equals(".srt", StringComparison.OrdinalIgnoreCase)
|| extension.Equals(".ssa", StringComparison.OrdinalIgnoreCase)
|| extension.Equals(".ass", StringComparison.OrdinalIgnoreCase)
|| extension.Equals(".sub", StringComparison.OrdinalIgnoreCase)
|| extension.Equals(".vtt", StringComparison.OrdinalIgnoreCase)
|| extension.Equals(".smi", StringComparison.OrdinalIgnoreCase)
|| extension.Equals(".sami", StringComparison.OrdinalIgnoreCase);
}
private static ReadOnlySpan<char> NormalizeFilenameForSubtitleComparison(string filename)
{
// Try to account for sloppy file naming
filename = filename.Replace("_", string.Empty, StringComparison.Ordinal);
filename = filename.Replace(" ", string.Empty, StringComparison.Ordinal);
return Path.GetFileNameWithoutExtension(filename.AsSpan());
}
private void AddExternalSubtitleStreams(
List<MediaStream> streams,
string folder,
string videoPath,
int startIndex,
IDirectoryService directoryService,
bool clearCache)
{
var files = directoryService.GetFilePaths(folder, clearCache).OrderBy(i => i).ToArray();
AddExternalSubtitleStreams(streams, videoPath, startIndex, files);
}
}
}