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- using MediaBrowser.Common.Configuration;
- using MediaBrowser.Common.Extensions;
- using MediaBrowser.Common.Net;
- using MediaBrowser.Controller.Entities;
- using MediaBrowser.Controller.Library;
- using MediaBrowser.Controller.MediaEncoding;
- using MediaBrowser.Model.Entities;
- using MediaBrowser.Model.Logging;
- using MediaBrowser.Model.MediaInfo;
- using MediaBrowser.Model.Serialization;
- using System;
- using System.Collections.Concurrent;
- using System.Diagnostics;
- using System.Globalization;
- using System.IO;
- using System.Linq;
- using System.Text;
- using System.Threading;
- using System.Threading.Tasks;
- using MediaBrowser.Model.IO;
- using MediaBrowser.Model.Diagnostics;
- using MediaBrowser.Model.Text;
- using UniversalDetector;
- namespace MediaBrowser.MediaEncoding.Subtitles
- {
- public class SubtitleEncoder : ISubtitleEncoder
- {
- private readonly ILibraryManager _libraryManager;
- private readonly ILogger _logger;
- private readonly IApplicationPaths _appPaths;
- private readonly IFileSystem _fileSystem;
- private readonly IMediaEncoder _mediaEncoder;
- private readonly IJsonSerializer _json;
- private readonly IHttpClient _httpClient;
- private readonly IMediaSourceManager _mediaSourceManager;
- private readonly IMemoryStreamFactory _memoryStreamProvider;
- private readonly IProcessFactory _processFactory;
- private readonly ITextEncoding _textEncoding;
- public SubtitleEncoder(ILibraryManager libraryManager, ILogger logger, IApplicationPaths appPaths, IFileSystem fileSystem, IMediaEncoder mediaEncoder, IJsonSerializer json, IHttpClient httpClient, IMediaSourceManager mediaSourceManager, IMemoryStreamFactory memoryStreamProvider, IProcessFactory processFactory, ITextEncoding textEncoding)
- {
- _libraryManager = libraryManager;
- _logger = logger;
- _appPaths = appPaths;
- _fileSystem = fileSystem;
- _mediaEncoder = mediaEncoder;
- _json = json;
- _httpClient = httpClient;
- _mediaSourceManager = mediaSourceManager;
- _memoryStreamProvider = memoryStreamProvider;
- _processFactory = processFactory;
- _textEncoding = textEncoding;
- }
- private string SubtitleCachePath
- {
- get
- {
- return Path.Combine(_appPaths.DataPath, "subtitles");
- }
- }
- private async Task<Stream> ConvertSubtitles(Stream stream,
- string inputFormat,
- string outputFormat,
- long startTimeTicks,
- long? endTimeTicks,
- bool preserveOriginalTimestamps,
- CancellationToken cancellationToken)
- {
- var ms = _memoryStreamProvider.CreateNew();
- try
- {
- var reader = GetReader(inputFormat, true);
- var trackInfo = reader.Parse(stream, cancellationToken);
- FilterEvents(trackInfo, startTimeTicks, endTimeTicks, preserveOriginalTimestamps);
- var writer = GetWriter(outputFormat);
- writer.Write(trackInfo, ms, cancellationToken);
- ms.Position = 0;
- }
- catch
- {
- ms.Dispose();
- throw;
- }
- return ms;
- }
- private void FilterEvents(SubtitleTrackInfo track, long startPositionTicks, long? endTimeTicks, bool preserveTimestamps)
- {
- // Drop subs that are earlier than what we're looking for
- track.TrackEvents = track.TrackEvents
- .SkipWhile(i => (i.StartPositionTicks - startPositionTicks) < 0 || (i.EndPositionTicks - startPositionTicks) < 0)
- .ToList();
- if (endTimeTicks.HasValue)
- {
- var endTime = endTimeTicks.Value;
- track.TrackEvents = track.TrackEvents
- .TakeWhile(i => i.StartPositionTicks <= endTime)
- .ToList();
- }
- if (!preserveTimestamps)
- {
- foreach (var trackEvent in track.TrackEvents)
- {
- trackEvent.EndPositionTicks -= startPositionTicks;
- trackEvent.StartPositionTicks -= startPositionTicks;
- }
- }
- }
- public async Task<Stream> GetSubtitles(string itemId,
- string mediaSourceId,
- int subtitleStreamIndex,
- string outputFormat,
- long startTimeTicks,
- long? endTimeTicks,
- bool preserveOriginalTimestamps,
- CancellationToken cancellationToken)
- {
- if (string.IsNullOrWhiteSpace(itemId))
- {
- throw new ArgumentNullException("itemId");
- }
- if (string.IsNullOrWhiteSpace(mediaSourceId))
- {
- throw new ArgumentNullException("mediaSourceId");
- }
- var subtitle = await GetSubtitleStream(itemId, mediaSourceId, subtitleStreamIndex, cancellationToken)
- .ConfigureAwait(false);
- var inputFormat = subtitle.Item2;
- if (string.Equals(inputFormat, outputFormat, StringComparison.OrdinalIgnoreCase) && TryGetWriter(outputFormat) == null)
- {
- return subtitle.Item1;
- }
- using (var stream = subtitle.Item1)
- {
- return await ConvertSubtitles(stream, inputFormat, outputFormat, startTimeTicks, endTimeTicks, preserveOriginalTimestamps, cancellationToken).ConfigureAwait(false);
- }
- }
- private async Task<Tuple<Stream, string>> GetSubtitleStream(string itemId,
- string mediaSourceId,
- int subtitleStreamIndex,
- CancellationToken cancellationToken)
- {
- if (string.IsNullOrWhiteSpace(itemId))
- {
- throw new ArgumentNullException("itemId");
- }
- if (string.IsNullOrWhiteSpace(mediaSourceId))
- {
- throw new ArgumentNullException("mediaSourceId");
- }
- var mediaSources = await _mediaSourceManager.GetPlayackMediaSources(itemId, null, false, new[] { MediaType.Audio, MediaType.Video }, cancellationToken).ConfigureAwait(false);
- var mediaSource = mediaSources
- .First(i => string.Equals(i.Id, mediaSourceId, StringComparison.OrdinalIgnoreCase));
- var subtitleStream = mediaSource.MediaStreams
- .First(i => i.Type == MediaStreamType.Subtitle && i.Index == subtitleStreamIndex);
- var inputFiles = new[] { mediaSource.Path };
- if (mediaSource.VideoType.HasValue)
- {
- if (mediaSource.VideoType.Value == VideoType.BluRay ||
- mediaSource.VideoType.Value == VideoType.Dvd)
- {
- var mediaSourceItem = (Video)_libraryManager.GetItemById(new Guid(mediaSourceId));
- inputFiles = mediaSourceItem.GetPlayableStreamFiles().ToArray();
- }
- }
- var fileInfo = await GetReadableFile(mediaSource.Path, inputFiles, mediaSource.Protocol, subtitleStream, cancellationToken).ConfigureAwait(false);
- var stream = await GetSubtitleStream(fileInfo.Item1, subtitleStream.Language, fileInfo.Item2, fileInfo.Item4, cancellationToken).ConfigureAwait(false);
- return new Tuple<Stream, string>(stream, fileInfo.Item3);
- }
- private async Task<Stream> GetSubtitleStream(string path, string language, MediaProtocol protocol, bool requiresCharset, CancellationToken cancellationToken)
- {
- if (requiresCharset)
- {
- var charset = await GetSubtitleFileCharacterSet(path, language, protocol, cancellationToken).ConfigureAwait(false);
- if (!string.IsNullOrEmpty(charset))
- {
- using (var fs = await GetStream(path, protocol, cancellationToken).ConfigureAwait(false))
- {
- using (var reader = new StreamReader(fs, GetEncoding(charset)))
- {
- var text = await reader.ReadToEndAsync().ConfigureAwait(false);
- var bytes = Encoding.UTF8.GetBytes(text);
- return _memoryStreamProvider.CreateNew(bytes);
- }
- }
- }
- }
- return _fileSystem.OpenRead(path);
- }
- private Encoding GetEncoding(string charset)
- {
- if (string.IsNullOrWhiteSpace(charset))
- {
- throw new ArgumentNullException("charset");
- }
- _logger.Debug("Getting encoding object for character set: {0}", charset);
- try
- {
- return Encoding.GetEncoding(charset);
- }
- catch (ArgumentException)
- {
- charset = charset.Replace("-", string.Empty);
- _logger.Debug("Getting encoding object for character set: {0}", charset);
- return Encoding.GetEncoding(charset);
- }
- }
- private async Task<Tuple<string, MediaProtocol, string, bool>> GetReadableFile(string mediaPath,
- string[] inputFiles,
- MediaProtocol protocol,
- MediaStream subtitleStream,
- CancellationToken cancellationToken)
- {
- if (!subtitleStream.IsExternal)
- {
- string outputFormat;
- string outputCodec;
- if (string.Equals(subtitleStream.Codec, "ass", StringComparison.OrdinalIgnoreCase) ||
- string.Equals(subtitleStream.Codec, "ssa", StringComparison.OrdinalIgnoreCase) ||
- string.Equals(subtitleStream.Codec, "srt", StringComparison.OrdinalIgnoreCase))
- {
- // Extract
- outputCodec = "copy";
- outputFormat = subtitleStream.Codec;
- }
- else if (string.Equals(subtitleStream.Codec, "subrip", StringComparison.OrdinalIgnoreCase))
- {
- // Extract
- outputCodec = "copy";
- outputFormat = "srt";
- }
- else
- {
- // Extract
- outputCodec = "srt";
- outputFormat = "srt";
- }
- // Extract
- var outputPath = GetSubtitleCachePath(mediaPath, protocol, subtitleStream.Index, "." + outputFormat);
- await ExtractTextSubtitle(inputFiles, protocol, subtitleStream.Index, outputCodec, outputPath, cancellationToken)
- .ConfigureAwait(false);
- return new Tuple<string, MediaProtocol, string, bool>(outputPath, MediaProtocol.File, outputFormat, false);
- }
- var currentFormat = (Path.GetExtension(subtitleStream.Path) ?? subtitleStream.Codec)
- .TrimStart('.');
- if (GetReader(currentFormat, false) == null)
- {
- // Convert
- var outputPath = GetSubtitleCachePath(mediaPath, protocol, subtitleStream.Index, ".srt");
- await ConvertTextSubtitleToSrt(subtitleStream.Path, subtitleStream.Language, protocol, outputPath, cancellationToken).ConfigureAwait(false);
- return new Tuple<string, MediaProtocol, string, bool>(outputPath, MediaProtocol.File, "srt", true);
- }
- return new Tuple<string, MediaProtocol, string, bool>(subtitleStream.Path, protocol, currentFormat, true);
- }
- private ISubtitleParser GetReader(string format, bool throwIfMissing)
- {
- if (string.IsNullOrEmpty(format))
- {
- throw new ArgumentNullException("format");
- }
- if (string.Equals(format, SubtitleFormat.SRT, StringComparison.OrdinalIgnoreCase))
- {
- return new SrtParser(_logger);
- }
- if (string.Equals(format, SubtitleFormat.SSA, StringComparison.OrdinalIgnoreCase))
- {
- return new SsaParser();
- }
- if (string.Equals(format, SubtitleFormat.ASS, StringComparison.OrdinalIgnoreCase))
- {
- return new AssParser();
- }
- if (throwIfMissing)
- {
- throw new ArgumentException("Unsupported format: " + format);
- }
- return null;
- }
- private ISubtitleWriter TryGetWriter(string format)
- {
- if (string.IsNullOrEmpty(format))
- {
- throw new ArgumentNullException("format");
- }
- if (string.Equals(format, "json", StringComparison.OrdinalIgnoreCase))
- {
- return new JsonWriter(_json);
- }
- if (string.Equals(format, SubtitleFormat.SRT, StringComparison.OrdinalIgnoreCase))
- {
- return new SrtWriter();
- }
- if (string.Equals(format, SubtitleFormat.VTT, StringComparison.OrdinalIgnoreCase))
- {
- return new VttWriter();
- }
- if (string.Equals(format, SubtitleFormat.TTML, StringComparison.OrdinalIgnoreCase))
- {
- return new TtmlWriter();
- }
- return null;
- }
- private ISubtitleWriter GetWriter(string format)
- {
- var writer = TryGetWriter(format);
- if (writer != null)
- {
- return writer;
- }
- throw new ArgumentException("Unsupported format: " + format);
- }
- /// <summary>
- /// The _semaphoreLocks
- /// </summary>
- private readonly ConcurrentDictionary<string, SemaphoreSlim> _semaphoreLocks =
- new ConcurrentDictionary<string, SemaphoreSlim>();
- /// <summary>
- /// Gets the lock.
- /// </summary>
- /// <param name="filename">The filename.</param>
- /// <returns>System.Object.</returns>
- private SemaphoreSlim GetLock(string filename)
- {
- return _semaphoreLocks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
- }
- /// <summary>
- /// Converts the text subtitle to SRT.
- /// </summary>
- /// <param name="inputPath">The input path.</param>
- /// <param name="inputProtocol">The input protocol.</param>
- /// <param name="outputPath">The output path.</param>
- /// <param name="cancellationToken">The cancellation token.</param>
- /// <returns>Task.</returns>
- private async Task ConvertTextSubtitleToSrt(string inputPath, string language, MediaProtocol inputProtocol, string outputPath, CancellationToken cancellationToken)
- {
- var semaphore = GetLock(outputPath);
- await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
- try
- {
- if (!_fileSystem.FileExists(outputPath))
- {
- await ConvertTextSubtitleToSrtInternal(inputPath, language, inputProtocol, outputPath, cancellationToken).ConfigureAwait(false);
- }
- }
- finally
- {
- semaphore.Release();
- }
- }
- /// <summary>
- /// Converts the text subtitle to SRT internal.
- /// </summary>
- /// <param name="inputPath">The input path.</param>
- /// <param name="inputProtocol">The input protocol.</param>
- /// <param name="outputPath">The output path.</param>
- /// <param name="cancellationToken">The cancellation token.</param>
- /// <returns>Task.</returns>
- /// <exception cref="System.ArgumentNullException">
- /// inputPath
- /// or
- /// outputPath
- /// </exception>
- private async Task ConvertTextSubtitleToSrtInternal(string inputPath, string language, MediaProtocol inputProtocol, string outputPath, CancellationToken cancellationToken)
- {
- if (string.IsNullOrEmpty(inputPath))
- {
- throw new ArgumentNullException("inputPath");
- }
- if (string.IsNullOrEmpty(outputPath))
- {
- throw new ArgumentNullException("outputPath");
- }
- _fileSystem.CreateDirectory(Path.GetDirectoryName(outputPath));
- var encodingParam = await GetSubtitleFileCharacterSet(inputPath, language, inputProtocol, cancellationToken).ConfigureAwait(false);
- if (!string.IsNullOrEmpty(encodingParam))
- {
- encodingParam = " -sub_charenc " + encodingParam;
- }
- var process = _processFactory.Create(new ProcessOptions
- {
- RedirectStandardOutput = false,
- RedirectStandardError = true,
- RedirectStandardInput = true,
- CreateNoWindow = true,
- UseShellExecute = false,
- FileName = _mediaEncoder.EncoderPath,
- Arguments = string.Format("{0} -i \"{1}\" -c:s srt \"{2}\"", encodingParam, inputPath, outputPath),
- IsHidden = true,
- ErrorDialog = false
- });
- _logger.Info("{0} {1}", process.StartInfo.FileName, process.StartInfo.Arguments);
- var logFilePath = Path.Combine(_appPaths.LogDirectoryPath, "ffmpeg-sub-convert-" + Guid.NewGuid() + ".txt");
- _fileSystem.CreateDirectory(Path.GetDirectoryName(logFilePath));
- var logFileStream = _fileSystem.GetFileStream(logFilePath, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read,
- true);
- try
- {
- process.Start();
- }
- catch (Exception ex)
- {
- logFileStream.Dispose();
- _logger.ErrorException("Error starting ffmpeg", ex);
- throw;
- }
-
- var logTask = process.StandardError.BaseStream.CopyToAsync(logFileStream);
- var ranToCompletion = process.WaitForExit(60000);
- if (!ranToCompletion)
- {
- try
- {
- _logger.Info("Killing ffmpeg subtitle conversion process");
- process.StandardInput.WriteLine("q");
- process.WaitForExit(1000);
- await logTask.ConfigureAwait(false);
- }
- catch (Exception ex)
- {
- _logger.ErrorException("Error killing subtitle conversion process", ex);
- }
- finally
- {
- logFileStream.Dispose();
- }
- }
- var exitCode = ranToCompletion ? process.ExitCode : -1;
- process.Dispose();
- var failed = false;
- if (exitCode == -1)
- {
- failed = true;
- if (_fileSystem.FileExists(outputPath))
- {
- try
- {
- _logger.Info("Deleting converted subtitle due to failure: ", outputPath);
- _fileSystem.DeleteFile(outputPath);
- }
- catch (IOException ex)
- {
- _logger.ErrorException("Error deleting converted subtitle {0}", ex, outputPath);
- }
- }
- }
- else if (!_fileSystem.FileExists(outputPath))
- {
- failed = true;
- }
- if (failed)
- {
- var msg = string.Format("ffmpeg subtitle converted failed for {0}", inputPath);
- _logger.Error(msg);
- throw new Exception(msg);
- }
- await SetAssFont(outputPath).ConfigureAwait(false);
- }
- /// <summary>
- /// Extracts the text subtitle.
- /// </summary>
- /// <param name="inputFiles">The input files.</param>
- /// <param name="protocol">The protocol.</param>
- /// <param name="subtitleStreamIndex">Index of the subtitle stream.</param>
- /// <param name="outputCodec">The output codec.</param>
- /// <param name="outputPath">The output path.</param>
- /// <param name="cancellationToken">The cancellation token.</param>
- /// <returns>Task.</returns>
- /// <exception cref="System.ArgumentException">Must use inputPath list overload</exception>
- private async Task ExtractTextSubtitle(string[] inputFiles, MediaProtocol protocol, int subtitleStreamIndex,
- string outputCodec, string outputPath, CancellationToken cancellationToken)
- {
- var semaphore = GetLock(outputPath);
- await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
- try
- {
- if (!_fileSystem.FileExists(outputPath))
- {
- await ExtractTextSubtitleInternal(_mediaEncoder.GetInputArgument(inputFiles, protocol), subtitleStreamIndex,
- outputCodec, outputPath, cancellationToken).ConfigureAwait(false);
- }
- }
- finally
- {
- semaphore.Release();
- }
- }
- private async Task ExtractTextSubtitleInternal(string inputPath, int subtitleStreamIndex,
- string outputCodec, string outputPath, CancellationToken cancellationToken)
- {
- if (string.IsNullOrEmpty(inputPath))
- {
- throw new ArgumentNullException("inputPath");
- }
- if (string.IsNullOrEmpty(outputPath))
- {
- throw new ArgumentNullException("outputPath");
- }
- _fileSystem.CreateDirectory(Path.GetDirectoryName(outputPath));
- var processArgs = string.Format("-i {0} -map 0:{1} -an -vn -c:s {2} \"{3}\"", inputPath,
- subtitleStreamIndex, outputCodec, outputPath);
- var process = _processFactory.Create(new ProcessOptions
- {
- CreateNoWindow = true,
- UseShellExecute = false,
- RedirectStandardOutput = false,
- RedirectStandardError = true,
- RedirectStandardInput = true,
- FileName = _mediaEncoder.EncoderPath,
- Arguments = processArgs,
- IsHidden = true,
- ErrorDialog = false
- });
- _logger.Info("{0} {1}", process.StartInfo.FileName, process.StartInfo.Arguments);
- var logFilePath = Path.Combine(_appPaths.LogDirectoryPath, "ffmpeg-sub-extract-" + Guid.NewGuid() + ".txt");
- _fileSystem.CreateDirectory(Path.GetDirectoryName(logFilePath));
- var logFileStream = _fileSystem.GetFileStream(logFilePath, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read,
- true);
- try
- {
- process.Start();
- }
- catch (Exception ex)
- {
- logFileStream.Dispose();
- _logger.ErrorException("Error starting ffmpeg", ex);
- throw;
- }
- // Important - don't await the log task or we won't be able to kill ffmpeg when the user stops playback
- Task.Run(() => StartStreamingLog(process.StandardError.BaseStream, logFileStream));
- var ranToCompletion = process.WaitForExit(300000);
- if (!ranToCompletion)
- {
- try
- {
- _logger.Info("Killing ffmpeg subtitle extraction process");
- process.StandardInput.WriteLine("q");
- process.WaitForExit(1000);
- }
- catch (Exception ex)
- {
- _logger.ErrorException("Error killing subtitle extraction process", ex);
- }
- finally
- {
- logFileStream.Dispose();
- }
- }
- var exitCode = ranToCompletion ? process.ExitCode : -1;
- process.Dispose();
- var failed = false;
- if (exitCode == -1)
- {
- failed = true;
- try
- {
- _logger.Info("Deleting extracted subtitle due to failure: {0}", outputPath);
- _fileSystem.DeleteFile(outputPath);
- }
- catch (FileNotFoundException)
- {
- }
- catch (IOException ex)
- {
- _logger.ErrorException("Error deleting extracted subtitle {0}", ex, outputPath);
- }
- }
- else if (!_fileSystem.FileExists(outputPath))
- {
- failed = true;
- }
- if (failed)
- {
- var msg = string.Format("ffmpeg subtitle extraction failed for {0} to {1}", inputPath, outputPath);
- _logger.Error(msg);
- throw new Exception(msg);
- }
- else
- {
- var msg = string.Format("ffmpeg subtitle extraction completed for {0} to {1}", inputPath, outputPath);
- _logger.Info(msg);
- }
- if (string.Equals(outputCodec, "ass", StringComparison.OrdinalIgnoreCase))
- {
- await SetAssFont(outputPath).ConfigureAwait(false);
- }
- }
- private async Task StartStreamingLog(Stream source, Stream target)
- {
- try
- {
- using (var reader = new StreamReader(source))
- {
- while (!reader.EndOfStream)
- {
- var line = await reader.ReadLineAsync().ConfigureAwait(false);
- var bytes = Encoding.UTF8.GetBytes(Environment.NewLine + line);
- await target.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
- await target.FlushAsync().ConfigureAwait(false);
- }
- }
- }
- catch (ObjectDisposedException)
- {
- // Don't spam the log. This doesn't seem to throw in windows, but sometimes under linux
- }
- catch (Exception ex)
- {
- _logger.ErrorException("Error reading ffmpeg log", ex);
- }
- }
- /// <summary>
- /// Sets the ass font.
- /// </summary>
- /// <param name="file">The file.</param>
- /// <returns>Task.</returns>
- private async Task SetAssFont(string file)
- {
- _logger.Info("Setting ass font within {0}", file);
- string text;
- Encoding encoding;
- using (var fileStream = _fileSystem.OpenRead(file))
- {
- using (var reader = new StreamReader(fileStream, true))
- {
- encoding = reader.CurrentEncoding;
- text = await reader.ReadToEndAsync().ConfigureAwait(false);
- }
- }
- var newText = text.Replace(",Arial,", ",Arial Unicode MS,");
- if (!string.Equals(text, newText))
- {
- using (var fileStream = _fileSystem.GetFileStream(file, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read))
- {
- using (var writer = new StreamWriter(fileStream, encoding))
- {
- writer.Write(newText);
- }
- }
- }
- }
- private string GetSubtitleCachePath(string mediaPath, MediaProtocol protocol, int subtitleStreamIndex, string outputSubtitleExtension)
- {
- if (protocol == MediaProtocol.File)
- {
- var ticksParam = string.Empty;
- var date = _fileSystem.GetLastWriteTimeUtc(mediaPath);
- var filename = (mediaPath + "_" + subtitleStreamIndex.ToString(CultureInfo.InvariantCulture) + "_" + date.Ticks.ToString(CultureInfo.InvariantCulture) + ticksParam).GetMD5() + outputSubtitleExtension;
- var prefix = filename.Substring(0, 1);
- return Path.Combine(SubtitleCachePath, prefix, filename);
- }
- else
- {
- var filename = (mediaPath + "_" + subtitleStreamIndex.ToString(CultureInfo.InvariantCulture)).GetMD5() + outputSubtitleExtension;
- var prefix = filename.Substring(0, 1);
- return Path.Combine(SubtitleCachePath, prefix, filename);
- }
- }
- public async Task<string> GetSubtitleFileCharacterSet(string path, string language, MediaProtocol protocol, CancellationToken cancellationToken)
- {
- if (protocol == MediaProtocol.File)
- {
- var fileEncoding = _textEncoding.GetFileEncoding(path);
- if (fileEncoding != null && fileEncoding.Equals(Encoding.UTF8))
- {
- return string.Empty;
- }
- }
- var charset = await DetectCharset(path, language, protocol, cancellationToken).ConfigureAwait(false);
- if (!string.IsNullOrWhiteSpace(charset))
- {
- if (string.Equals(charset, "utf-8", StringComparison.OrdinalIgnoreCase))
- {
- return null;
- }
- return charset;
- }
- if (!string.IsNullOrWhiteSpace(language))
- {
- return GetSubtitleFileCharacterSetFromLanguage(language);
- }
- return null;
- }
- public string GetSubtitleFileCharacterSetFromLanguage(string language)
- {
- // https://developer.xamarin.com/api/type/System.Text.Encoding/
- switch (language.ToLower())
- {
- case "hun":
- return "windows-1252";
- case "pol":
- case "cze":
- case "ces":
- case "slo":
- case "slk":
- case "slv":
- case "srp":
- case "hrv":
- case "rum":
- case "ron":
- case "rup":
- case "alb":
- case "sqi":
- return "windows-1250";
- case "ara":
- return "windows-1256";
- case "heb":
- return "windows-1255";
- case "grc":
- case "gre":
- return "windows-1253";
- case "crh":
- case "ota":
- case "tur":
- return "windows-1254";
- case "rus":
- return "windows-1251";
- case "vie":
- return "windows-1258";
- case "kor":
- return "cp949";
- default:
- return "windows-1252";
- }
- }
- private async Task<string> DetectCharset(string path, string language, MediaProtocol protocol, CancellationToken cancellationToken)
- {
- try
- {
- using (var file = await GetStream(path, protocol, cancellationToken).ConfigureAwait(false))
- {
- var detector = new CharsetDetector();
- detector.Feed(file);
- detector.DataEnd();
- var charset = detector.Charset;
- if (!string.IsNullOrWhiteSpace(charset))
- {
- _logger.Info("UniversalDetector detected charset {0} for {1}", charset, path);
- }
- // This is often incorrectly indetected. If this happens, try to use other techniques instead
- if (string.Equals("x-mac-cyrillic", charset, StringComparison.OrdinalIgnoreCase))
- {
- if (!string.IsNullOrWhiteSpace(language))
- {
- return null;
- }
- }
- return charset;
- }
- }
- catch (IOException ex)
- {
- _logger.ErrorException("Error attempting to determine subtitle charset from {0}", ex, path);
- }
- return null;
- }
- private async Task<Stream> GetStream(string path, MediaProtocol protocol, CancellationToken cancellationToken)
- {
- if (protocol == MediaProtocol.Http)
- {
- return await _httpClient.Get(path, cancellationToken).ConfigureAwait(false);
- }
- if (protocol == MediaProtocol.File)
- {
- return _fileSystem.GetFileStream(path, FileOpenMode.Open, FileAccessMode.Read, FileShareMode.ReadWrite);
- }
- throw new ArgumentOutOfRangeException("protocol");
- }
- }
- }
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