867 lines
30 KiB
C#
867 lines
30 KiB
C#
using MediaBrowser.Common.Configuration;
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using MediaBrowser.Common.Extensions;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Controller.MediaEncoding;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.MediaInfo;
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using MediaBrowser.Model.Serialization;
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using System;
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using System.Collections.Concurrent;
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using System.Diagnostics;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using CommonIO;
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using UniversalDetector;
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namespace MediaBrowser.MediaEncoding.Subtitles
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{
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public class SubtitleEncoder : ISubtitleEncoder
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{
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private readonly ILibraryManager _libraryManager;
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private readonly ILogger _logger;
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private readonly IApplicationPaths _appPaths;
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private readonly IFileSystem _fileSystem;
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private readonly IMediaEncoder _mediaEncoder;
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private readonly IJsonSerializer _json;
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private readonly IHttpClient _httpClient;
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private readonly IMediaSourceManager _mediaSourceManager;
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public SubtitleEncoder(ILibraryManager libraryManager, ILogger logger, IApplicationPaths appPaths, IFileSystem fileSystem, IMediaEncoder mediaEncoder, IJsonSerializer json, IHttpClient httpClient, IMediaSourceManager mediaSourceManager)
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{
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_libraryManager = libraryManager;
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_logger = logger;
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_appPaths = appPaths;
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_fileSystem = fileSystem;
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_mediaEncoder = mediaEncoder;
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_json = json;
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_httpClient = httpClient;
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_mediaSourceManager = mediaSourceManager;
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}
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private string SubtitleCachePath
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{
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get
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{
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return Path.Combine(_appPaths.DataPath, "subtitles");
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}
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}
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private async Task<Stream> ConvertSubtitles(Stream stream,
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string inputFormat,
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string outputFormat,
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long startTimeTicks,
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long? endTimeTicks,
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CancellationToken cancellationToken)
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{
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var ms = new MemoryStream();
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try
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{
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var reader = GetReader(inputFormat, true);
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var trackInfo = reader.Parse(stream, cancellationToken);
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FilterEvents(trackInfo, startTimeTicks, endTimeTicks, false);
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var writer = GetWriter(outputFormat);
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writer.Write(trackInfo, ms, cancellationToken);
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ms.Position = 0;
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}
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catch
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{
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ms.Dispose();
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throw;
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}
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return ms;
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}
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private void FilterEvents(SubtitleTrackInfo track, long startPositionTicks, long? endTimeTicks, bool preserveTimestamps)
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{
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// Drop subs that are earlier than what we're looking for
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track.TrackEvents = track.TrackEvents
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.SkipWhile(i => (i.StartPositionTicks - startPositionTicks) < 0 || (i.EndPositionTicks - startPositionTicks) < 0)
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.ToList();
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if (endTimeTicks.HasValue)
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{
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var endTime = endTimeTicks.Value;
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track.TrackEvents = track.TrackEvents
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.TakeWhile(i => i.StartPositionTicks <= endTime)
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.ToList();
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}
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if (!preserveTimestamps)
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{
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foreach (var trackEvent in track.TrackEvents)
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{
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trackEvent.EndPositionTicks -= startPositionTicks;
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trackEvent.StartPositionTicks -= startPositionTicks;
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}
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}
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}
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public async Task<Stream> GetSubtitles(string itemId,
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string mediaSourceId,
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int subtitleStreamIndex,
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string outputFormat,
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long startTimeTicks,
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long? endTimeTicks,
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CancellationToken cancellationToken)
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{
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var subtitle = await GetSubtitleStream(itemId, mediaSourceId, subtitleStreamIndex, cancellationToken)
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.ConfigureAwait(false);
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var inputFormat = subtitle.Item2;
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if (string.Equals(inputFormat, outputFormat, StringComparison.OrdinalIgnoreCase) && TryGetWriter(outputFormat) == null)
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{
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return subtitle.Item1;
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}
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using (var stream = subtitle.Item1)
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{
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return await ConvertSubtitles(stream, inputFormat, outputFormat, startTimeTicks, endTimeTicks, cancellationToken).ConfigureAwait(false);
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}
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}
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private async Task<Tuple<Stream, string>> GetSubtitleStream(string itemId,
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string mediaSourceId,
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int subtitleStreamIndex,
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CancellationToken cancellationToken)
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{
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var mediaSources = await _mediaSourceManager.GetPlayackMediaSources(itemId, null, false, new[] { MediaType.Audio, MediaType.Video }, cancellationToken).ConfigureAwait(false);
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var mediaSource = mediaSources
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.First(i => string.Equals(i.Id, mediaSourceId));
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var subtitleStream = mediaSource.MediaStreams
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.First(i => i.Type == MediaStreamType.Subtitle && i.Index == subtitleStreamIndex);
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var inputFiles = new[] { mediaSource.Path };
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if (mediaSource.VideoType.HasValue)
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{
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if (mediaSource.VideoType.Value == VideoType.BluRay ||
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mediaSource.VideoType.Value == VideoType.Dvd)
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{
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var mediaSourceItem = (Video)_libraryManager.GetItemById(new Guid(mediaSourceId));
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inputFiles = mediaSourceItem.GetPlayableStreamFiles().ToArray();
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}
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}
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var fileInfo = await GetReadableFile(mediaSource.Path, inputFiles, mediaSource.Protocol, subtitleStream, cancellationToken).ConfigureAwait(false);
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var stream = await GetSubtitleStream(fileInfo.Item1, fileInfo.Item2, fileInfo.Item4, cancellationToken).ConfigureAwait(false);
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return new Tuple<Stream, string>(stream, fileInfo.Item3);
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}
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private async Task<Stream> GetSubtitleStream(string path, MediaProtocol protocol, bool requiresCharset, CancellationToken cancellationToken)
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{
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if (requiresCharset)
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{
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var charset = await GetSubtitleFileCharacterSet(path, protocol, cancellationToken).ConfigureAwait(false);
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if (!string.IsNullOrEmpty(charset))
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{
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using (var fs = await GetStream(path, protocol, cancellationToken).ConfigureAwait(false))
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{
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using (var reader = new StreamReader(fs, GetEncoding(charset)))
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{
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var text = await reader.ReadToEndAsync().ConfigureAwait(false);
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var bytes = Encoding.UTF8.GetBytes(text);
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return new MemoryStream(bytes);
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}
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}
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}
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}
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return _fileSystem.OpenRead(path);
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}
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private Encoding GetEncoding(string charset)
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{
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if (string.IsNullOrWhiteSpace(charset))
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{
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throw new ArgumentNullException("charset");
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}
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try
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{
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return Encoding.GetEncoding(charset);
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}
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catch (ArgumentException)
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{
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return Encoding.GetEncoding(charset.Replace("-", string.Empty));
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}
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}
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private async Task<Tuple<string, MediaProtocol, string, bool>> GetReadableFile(string mediaPath,
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string[] inputFiles,
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MediaProtocol protocol,
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MediaStream subtitleStream,
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CancellationToken cancellationToken)
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{
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if (!subtitleStream.IsExternal)
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{
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string outputFormat;
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string outputCodec;
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if (string.Equals(subtitleStream.Codec, "ass", StringComparison.OrdinalIgnoreCase))
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{
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// Extract
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outputCodec = "copy";
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outputFormat = "ass";
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}
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else if (string.Equals(subtitleStream.Codec, "subrip", StringComparison.OrdinalIgnoreCase) ||
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string.Equals(subtitleStream.Codec, "srt", StringComparison.OrdinalIgnoreCase))
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{
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// Extract
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outputCodec = "copy";
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outputFormat = "srt";
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}
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else
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{
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// Extract
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outputCodec = "srt";
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outputFormat = "srt";
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}
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// Extract
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var outputPath = GetSubtitleCachePath(mediaPath, protocol, subtitleStream.Index, "." + outputFormat);
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await ExtractTextSubtitle(inputFiles, protocol, subtitleStream.Index, outputCodec, outputPath, cancellationToken)
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.ConfigureAwait(false);
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return new Tuple<string, MediaProtocol, string, bool>(outputPath, MediaProtocol.File, outputFormat, false);
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}
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var currentFormat = (Path.GetExtension(subtitleStream.Path) ?? subtitleStream.Codec)
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.TrimStart('.');
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if (GetReader(currentFormat, false) == null)
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{
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// Convert
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var outputPath = GetSubtitleCachePath(mediaPath, protocol, subtitleStream.Index, ".srt");
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await ConvertTextSubtitleToSrt(subtitleStream.Path, protocol, outputPath, cancellationToken).ConfigureAwait(false);
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return new Tuple<string, MediaProtocol, string, bool>(outputPath, MediaProtocol.File, "srt", true);
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}
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return new Tuple<string, MediaProtocol, string, bool>(subtitleStream.Path, protocol, currentFormat, true);
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}
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private ISubtitleParser GetReader(string format, bool throwIfMissing)
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{
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if (string.IsNullOrEmpty(format))
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{
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throw new ArgumentNullException("format");
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}
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if (string.Equals(format, SubtitleFormat.SRT, StringComparison.OrdinalIgnoreCase))
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{
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return new SrtParser(_logger);
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}
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if (string.Equals(format, SubtitleFormat.SSA, StringComparison.OrdinalIgnoreCase))
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{
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return new SsaParser();
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}
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if (string.Equals(format, SubtitleFormat.ASS, StringComparison.OrdinalIgnoreCase))
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{
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return new AssParser();
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}
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if (throwIfMissing)
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{
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throw new ArgumentException("Unsupported format: " + format);
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}
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return null;
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}
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private ISubtitleWriter TryGetWriter(string format)
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{
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if (string.IsNullOrEmpty(format))
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{
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throw new ArgumentNullException("format");
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}
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if (string.Equals(format, "json", StringComparison.OrdinalIgnoreCase))
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{
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return new JsonWriter(_json);
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}
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if (string.Equals(format, SubtitleFormat.SRT, StringComparison.OrdinalIgnoreCase))
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{
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return new SrtWriter();
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}
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if (string.Equals(format, SubtitleFormat.VTT, StringComparison.OrdinalIgnoreCase))
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{
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return new VttWriter();
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}
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if (string.Equals(format, SubtitleFormat.TTML, StringComparison.OrdinalIgnoreCase))
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{
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return new TtmlWriter();
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}
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return null;
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}
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private ISubtitleWriter GetWriter(string format)
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{
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var writer = TryGetWriter(format);
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if (writer != null)
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{
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return writer;
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}
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throw new ArgumentException("Unsupported format: " + format);
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}
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/// <summary>
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/// The _semaphoreLocks
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/// </summary>
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private readonly ConcurrentDictionary<string, SemaphoreSlim> _semaphoreLocks =
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new ConcurrentDictionary<string, SemaphoreSlim>();
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/// <summary>
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/// Gets the lock.
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/// </summary>
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/// <param name="filename">The filename.</param>
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/// <returns>System.Object.</returns>
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private SemaphoreSlim GetLock(string filename)
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{
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return _semaphoreLocks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
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}
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/// <summary>
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/// Converts the text subtitle to SRT.
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/// </summary>
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/// <param name="inputPath">The input path.</param>
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/// <param name="inputProtocol">The input protocol.</param>
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/// <param name="outputPath">The output path.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task.</returns>
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private async Task ConvertTextSubtitleToSrt(string inputPath, MediaProtocol inputProtocol, string outputPath, CancellationToken cancellationToken)
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{
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var semaphore = GetLock(outputPath);
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await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
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try
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{
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if (!_fileSystem.FileExists(outputPath))
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{
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await ConvertTextSubtitleToSrtInternal(inputPath, inputProtocol, outputPath, cancellationToken).ConfigureAwait(false);
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}
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}
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finally
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{
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semaphore.Release();
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}
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}
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/// <summary>
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/// Converts the text subtitle to SRT internal.
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/// </summary>
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/// <param name="inputPath">The input path.</param>
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/// <param name="inputProtocol">The input protocol.</param>
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/// <param name="outputPath">The output path.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task.</returns>
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/// <exception cref="System.ArgumentNullException">
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/// inputPath
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/// or
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/// outputPath
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/// </exception>
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/// <exception cref="System.ApplicationException"></exception>
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private async Task ConvertTextSubtitleToSrtInternal(string inputPath, MediaProtocol inputProtocol, string outputPath, CancellationToken cancellationToken)
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{
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if (string.IsNullOrEmpty(inputPath))
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{
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throw new ArgumentNullException("inputPath");
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}
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if (string.IsNullOrEmpty(outputPath))
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{
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throw new ArgumentNullException("outputPath");
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}
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_fileSystem.CreateDirectory(Path.GetDirectoryName(outputPath));
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var encodingParam = await GetSubtitleFileCharacterSet(inputPath, inputProtocol, cancellationToken).ConfigureAwait(false);
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if (!string.IsNullOrEmpty(encodingParam))
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{
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encodingParam = " -sub_charenc " + encodingParam;
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}
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var process = new Process
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{
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StartInfo = new ProcessStartInfo
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{
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RedirectStandardOutput = false,
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RedirectStandardError = true,
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RedirectStandardInput = true,
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CreateNoWindow = true,
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UseShellExecute = false,
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FileName = _mediaEncoder.EncoderPath,
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Arguments = string.Format("{0} -i \"{1}\" -c:s srt \"{2}\"", encodingParam, inputPath, outputPath),
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WindowStyle = ProcessWindowStyle.Hidden,
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ErrorDialog = false
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}
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};
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_logger.Info("{0} {1}", process.StartInfo.FileName, process.StartInfo.Arguments);
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var logFilePath = Path.Combine(_appPaths.LogDirectoryPath, "ffmpeg-sub-convert-" + Guid.NewGuid() + ".txt");
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_fileSystem.CreateDirectory(Path.GetDirectoryName(logFilePath));
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var logFileStream = _fileSystem.GetFileStream(logFilePath, FileMode.Create, FileAccess.Write, FileShare.Read,
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true);
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try
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{
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process.Start();
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}
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catch (Exception ex)
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{
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logFileStream.Dispose();
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_logger.ErrorException("Error starting ffmpeg", ex);
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throw;
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}
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var logTask = process.StandardError.BaseStream.CopyToAsync(logFileStream);
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var ranToCompletion = process.WaitForExit(60000);
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if (!ranToCompletion)
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{
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try
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{
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_logger.Info("Killing ffmpeg subtitle conversion process");
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process.StandardInput.WriteLine("q");
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process.WaitForExit(1000);
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await logTask.ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error killing subtitle conversion process", ex);
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}
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finally
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{
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logFileStream.Dispose();
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}
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}
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var exitCode = ranToCompletion ? process.ExitCode : -1;
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process.Dispose();
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var failed = false;
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if (exitCode == -1)
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{
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failed = true;
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|
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if (_fileSystem.FileExists(outputPath))
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{
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try
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{
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_logger.Info("Deleting converted subtitle due to failure: ", outputPath);
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_fileSystem.DeleteFile(outputPath);
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}
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catch (IOException ex)
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{
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_logger.ErrorException("Error deleting converted subtitle {0}", ex, outputPath);
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}
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}
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}
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else if (!_fileSystem.FileExists(outputPath))
|
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{
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failed = true;
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}
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|
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if (failed)
|
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{
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var msg = string.Format("ffmpeg subtitle converted failed for {0}", inputPath);
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_logger.Error(msg);
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throw new ApplicationException(msg);
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}
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await SetAssFont(outputPath).ConfigureAwait(false);
|
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}
|
|
|
|
/// <summary>
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/// Extracts the text subtitle.
|
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/// </summary>
|
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/// <param name="inputFiles">The input files.</param>
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/// <param name="protocol">The protocol.</param>
|
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/// <param name="subtitleStreamIndex">Index of the subtitle stream.</param>
|
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/// <param name="outputCodec">The output codec.</param>
|
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/// <param name="outputPath">The output path.</param>
|
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/// <param name="cancellationToken">The cancellation token.</param>
|
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/// <returns>Task.</returns>
|
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/// <exception cref="System.ArgumentException">Must use inputPath list overload</exception>
|
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private async Task ExtractTextSubtitle(string[] inputFiles, MediaProtocol protocol, int subtitleStreamIndex,
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string outputCodec, string outputPath, CancellationToken cancellationToken)
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{
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var semaphore = GetLock(outputPath);
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await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
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try
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{
|
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if (!_fileSystem.FileExists(outputPath))
|
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{
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await ExtractTextSubtitleInternal(_mediaEncoder.GetInputArgument(inputFiles, protocol), subtitleStreamIndex,
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outputCodec, outputPath, cancellationToken).ConfigureAwait(false);
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}
|
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}
|
|
finally
|
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{
|
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semaphore.Release();
|
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}
|
|
}
|
|
|
|
private async Task ExtractTextSubtitleInternal(string inputPath, int subtitleStreamIndex,
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string outputCodec, string outputPath, CancellationToken cancellationToken)
|
|
{
|
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if (string.IsNullOrEmpty(inputPath))
|
|
{
|
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throw new ArgumentNullException("inputPath");
|
|
}
|
|
|
|
if (string.IsNullOrEmpty(outputPath))
|
|
{
|
|
throw new ArgumentNullException("outputPath");
|
|
}
|
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|
|
_fileSystem.CreateDirectory(Path.GetDirectoryName(outputPath));
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|
|
var processArgs = string.Format("-i {0} -map 0:{1} -an -vn -c:s {2} \"{3}\"", inputPath,
|
|
subtitleStreamIndex, outputCodec, outputPath);
|
|
|
|
var process = new Process
|
|
{
|
|
StartInfo = new ProcessStartInfo
|
|
{
|
|
CreateNoWindow = true,
|
|
UseShellExecute = false,
|
|
|
|
RedirectStandardOutput = false,
|
|
RedirectStandardError = true,
|
|
RedirectStandardInput = true,
|
|
|
|
FileName = _mediaEncoder.EncoderPath,
|
|
Arguments = processArgs,
|
|
WindowStyle = ProcessWindowStyle.Hidden,
|
|
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, FileMode.Create, FileAccess.Write, FileShare.Read,
|
|
true);
|
|
|
|
try
|
|
{
|
|
process.Start();
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
logFileStream.Dispose();
|
|
|
|
_logger.ErrorException("Error starting ffmpeg", ex);
|
|
|
|
throw;
|
|
}
|
|
|
|
process.StandardError.BaseStream.CopyToAsync(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 (DirectoryNotFoundException)
|
|
{
|
|
|
|
}
|
|
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 ApplicationException(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);
|
|
}
|
|
}
|
|
|
|
/// <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 reader = new StreamReader(file, 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 writer = new StreamWriter(file, false, 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, MediaProtocol protocol, CancellationToken cancellationToken)
|
|
{
|
|
if (protocol == MediaProtocol.File)
|
|
{
|
|
if (GetFileEncoding(path).Equals(Encoding.UTF8))
|
|
{
|
|
return string.Empty;
|
|
}
|
|
}
|
|
|
|
var charset = await DetectCharset(path, protocol, cancellationToken).ConfigureAwait(false);
|
|
|
|
if (!string.IsNullOrWhiteSpace(charset))
|
|
{
|
|
if (string.Equals(charset, "utf-8", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
return null;
|
|
}
|
|
|
|
return charset;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
public string GetSubtitleFileCharacterSetFromLanguage(string language)
|
|
{
|
|
switch (language.ToLower())
|
|
{
|
|
case "pol":
|
|
case "cze":
|
|
case "ces":
|
|
case "slo":
|
|
case "slk":
|
|
case "hun":
|
|
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, 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);
|
|
}
|
|
|
|
return charset;
|
|
}
|
|
}
|
|
catch (IOException ex)
|
|
{
|
|
_logger.ErrorException("Error attempting to determine subtitle charset from {0}", ex, path);
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
private Encoding GetFileEncoding(string srcFile)
|
|
{
|
|
// *** Detect byte order mark if any - otherwise assume default
|
|
var buffer = new byte[5];
|
|
|
|
using (var file = _fileSystem.GetFileStream(srcFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
|
|
{
|
|
file.Read(buffer, 0, 5);
|
|
}
|
|
|
|
if (buffer[0] == 0xef && buffer[1] == 0xbb && buffer[2] == 0xbf)
|
|
return Encoding.UTF8;
|
|
if (buffer[0] == 0xfe && buffer[1] == 0xff)
|
|
return Encoding.Unicode;
|
|
if (buffer[0] == 0 && buffer[1] == 0 && buffer[2] == 0xfe && buffer[3] == 0xff)
|
|
return Encoding.UTF32;
|
|
if (buffer[0] == 0x2b && buffer[1] == 0x2f && buffer[2] == 0x76)
|
|
return Encoding.UTF7;
|
|
|
|
// It's ok - anything aside from utf is ok since that's what we're looking for
|
|
return Encoding.Default;
|
|
}
|
|
|
|
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, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
|
|
}
|
|
|
|
throw new ArgumentOutOfRangeException("protocol");
|
|
}
|
|
}
|
|
}
|