777 lines
28 KiB
C#
777 lines
28 KiB
C#
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 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.Dto;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.MediaInfo;
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using Microsoft.Extensions.Logging;
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using UtfUnknown;
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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 IHttpClient _httpClient;
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private readonly IMediaSourceManager _mediaSourceManager;
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public SubtitleEncoder(
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ILibraryManager libraryManager,
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ILogger<SubtitleEncoder> logger,
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IApplicationPaths appPaths,
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IFileSystem fileSystem,
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IMediaEncoder mediaEncoder,
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IHttpClient httpClient,
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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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_httpClient = httpClient;
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_mediaSourceManager = mediaSourceManager;
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}
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private string SubtitleCachePath => Path.Combine(_appPaths.DataPath, "subtitles");
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private Stream ConvertSubtitles(
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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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bool preserveOriginalTimestamps,
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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, preserveOriginalTimestamps);
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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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.ToArray();
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if (endTimeTicks > 0)
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{
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track.TrackEvents = track.TrackEvents
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.TakeWhile(i => i.StartPositionTicks <= endTimeTicks)
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.ToArray();
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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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async Task<Stream> ISubtitleEncoder.GetSubtitles(BaseItem item, string mediaSourceId, int subtitleStreamIndex, string outputFormat, long startTimeTicks, long endTimeTicks, bool preserveOriginalTimestamps, CancellationToken cancellationToken)
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{
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if (item == null)
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{
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throw new ArgumentNullException(nameof(item));
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}
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if (string.IsNullOrWhiteSpace(mediaSourceId))
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{
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throw new ArgumentNullException(nameof(mediaSourceId));
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}
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var mediaSources = await _mediaSourceManager.GetPlaybackMediaSources(item, null, true, false, cancellationToken).ConfigureAwait(false);
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var mediaSource = mediaSources
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.First(i => string.Equals(i.Id, mediaSourceId, StringComparison.OrdinalIgnoreCase));
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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 subtitle = await GetSubtitleStream(mediaSource, subtitleStream, cancellationToken)
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.ConfigureAwait(false);
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var inputFormat = subtitle.format;
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var writer = TryGetWriter(outputFormat);
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// Return the original if we don't have any way of converting it
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if (writer == null)
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{
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return subtitle.stream;
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}
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// Return the original if the same format is being requested
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// Character encoding was already handled in GetSubtitleStream
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if (string.Equals(inputFormat, outputFormat, StringComparison.OrdinalIgnoreCase))
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{
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return subtitle.stream;
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}
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using (var stream = subtitle.stream)
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{
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return ConvertSubtitles(stream, inputFormat, outputFormat, startTimeTicks, endTimeTicks, preserveOriginalTimestamps, cancellationToken);
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}
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}
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private async Task<(Stream stream, string format)> GetSubtitleStream(
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MediaSourceInfo mediaSource,
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MediaStream subtitleStream,
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CancellationToken cancellationToken)
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{
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string[] inputFiles;
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if (mediaSource.VideoType.HasValue
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&& (mediaSource.VideoType.Value == VideoType.BluRay || mediaSource.VideoType.Value == VideoType.Dvd))
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{
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var mediaSourceItem = (Video)_libraryManager.GetItemById(new Guid(mediaSource.Id));
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inputFiles = mediaSourceItem.GetPlayableStreamFileNames();
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}
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else
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{
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inputFiles = new[] { mediaSource.Path };
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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.Path, fileInfo.Protocol, fileInfo.IsExternal, cancellationToken).ConfigureAwait(false);
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return (stream, fileInfo.Format);
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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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using (var stream = await GetStream(path, protocol, cancellationToken).ConfigureAwait(false))
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{
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var result = CharsetDetector.DetectFromStream(stream).Detected;
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stream.Position = 0;
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if (result != null)
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{
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_logger.LogDebug("charset {CharSet} detected for {Path}", result.EncodingName, path);
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using var reader = new StreamReader(stream, result.Encoding);
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var text = await reader.ReadToEndAsync().ConfigureAwait(false);
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return new MemoryStream(Encoding.UTF8.GetBytes(text));
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}
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}
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}
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return File.OpenRead(path);
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}
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private async Task<SubtitleInfo> GetReadableFile(
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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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string.Equals(subtitleStream.Codec, "ssa", 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 = subtitleStream.Codec;
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}
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else if (string.Equals(subtitleStream.Codec, "subrip", 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 SubtitleInfo(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, subtitleStream.Language, protocol, outputPath, cancellationToken).ConfigureAwait(false);
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return new SubtitleInfo(outputPath, MediaProtocol.File, "srt", true);
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}
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return new SubtitleInfo(subtitleStream.Path, protocol, currentFormat, true);
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}
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private struct SubtitleInfo
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{
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public SubtitleInfo(string path, MediaProtocol protocol, string format, bool isExternal)
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{
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Path = path;
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Protocol = protocol;
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Format = format;
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IsExternal = isExternal;
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}
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public string Path { get; set; }
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public MediaProtocol Protocol { get; set; }
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public string Format { get; set; }
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public bool IsExternal { get; set; }
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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(nameof(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(nameof(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();
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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, string language, 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 (!File.Exists(outputPath))
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{
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await ConvertTextSubtitleToSrtInternal(inputPath, language, 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="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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private async Task ConvertTextSubtitleToSrtInternal(string inputPath, string language, 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(nameof(inputPath));
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}
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if (string.IsNullOrEmpty(outputPath))
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{
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throw new ArgumentNullException(nameof(outputPath));
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}
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Directory.CreateDirectory(Path.GetDirectoryName(outputPath));
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var encodingParam = await GetSubtitleFileCharacterSet(inputPath, language, inputProtocol, cancellationToken).ConfigureAwait(false);
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// FFmpeg automatically convert character encoding when it is UTF-16
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// If we specify character encoding, it rejects with "do not specify a character encoding" and "Unable to recode subtitle event"
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if ((inputPath.EndsWith(".smi") || inputPath.EndsWith(".sami")) && (encodingParam == "UTF-16BE" || encodingParam == "UTF-16LE"))
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{
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encodingParam = "";
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}
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else if (!string.IsNullOrEmpty(encodingParam))
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{
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encodingParam = " -sub_charenc " + encodingParam;
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}
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int exitCode;
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using (var process = new Process
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{
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StartInfo = new ProcessStartInfo
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{
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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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EnableRaisingEvents = true
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})
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{
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_logger.LogInformation("{0} {1}", process.StartInfo.FileName, process.StartInfo.Arguments);
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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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_logger.LogError(ex, "Error starting ffmpeg");
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throw;
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}
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var ranToCompletion = await process.WaitForExitAsync(TimeSpan.FromMinutes(5)).ConfigureAwait(false);
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if (!ranToCompletion)
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{
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try
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{
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_logger.LogInformation("Killing ffmpeg subtitle conversion process");
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process.Kill();
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Error killing subtitle conversion process");
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}
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}
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exitCode = ranToCompletion ? process.ExitCode : -1;
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}
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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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if (File.Exists(outputPath))
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{
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try
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{
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_logger.LogInformation("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.LogError(ex, "Error deleting converted subtitle {Path}", outputPath);
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}
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}
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}
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else if (!File.Exists(outputPath))
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{
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failed = true;
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}
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if (failed)
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{
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_logger.LogError("ffmpeg subtitle conversion failed for {Path}", inputPath);
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throw new Exception(
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string.Format(CultureInfo.InvariantCulture, "ffmpeg subtitle conversion failed for {0}", inputPath));
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}
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await SetAssFont(outputPath).ConfigureAwait(false);
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_logger.LogInformation("ffmpeg subtitle conversion succeeded for {Path}", inputPath);
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}
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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="ArgumentException">Must use inputPath list overload</exception>
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private async Task ExtractTextSubtitle(
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string[] inputFiles,
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MediaProtocol protocol,
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int subtitleStreamIndex,
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string outputCodec,
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string outputPath,
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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 (!File.Exists(outputPath))
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{
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await ExtractTextSubtitleInternal(
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_mediaEncoder.GetInputArgument(inputFiles, protocol),
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subtitleStreamIndex,
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outputCodec,
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outputPath,
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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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private async Task ExtractTextSubtitleInternal(
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string inputPath,
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int subtitleStreamIndex,
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string outputCodec,
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string outputPath,
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CancellationToken cancellationToken)
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{
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|
if (string.IsNullOrEmpty(inputPath))
|
|
{
|
|
throw new ArgumentNullException(nameof(inputPath));
|
|
}
|
|
|
|
if (string.IsNullOrEmpty(outputPath))
|
|
{
|
|
throw new ArgumentNullException(nameof(outputPath));
|
|
}
|
|
|
|
Directory.CreateDirectory(Path.GetDirectoryName(outputPath));
|
|
|
|
var processArgs = string.Format(
|
|
CultureInfo.InvariantCulture,
|
|
"-i {0} -map 0:{1} -an -vn -c:s {2} \"{3}\"",
|
|
inputPath,
|
|
subtitleStreamIndex,
|
|
outputCodec,
|
|
outputPath);
|
|
|
|
int exitCode;
|
|
|
|
using (var process = new Process
|
|
{
|
|
StartInfo = new ProcessStartInfo
|
|
{
|
|
CreateNoWindow = true,
|
|
UseShellExecute = false,
|
|
FileName = _mediaEncoder.EncoderPath,
|
|
Arguments = processArgs,
|
|
WindowStyle = ProcessWindowStyle.Hidden,
|
|
ErrorDialog = false
|
|
},
|
|
EnableRaisingEvents = true
|
|
})
|
|
{
|
|
_logger.LogInformation("{File} {Arguments}", process.StartInfo.FileName, process.StartInfo.Arguments);
|
|
|
|
try
|
|
{
|
|
process.Start();
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
_logger.LogError(ex, "Error starting ffmpeg");
|
|
|
|
throw;
|
|
}
|
|
|
|
var ranToCompletion = await process.WaitForExitAsync(TimeSpan.FromMinutes(5)).ConfigureAwait(false);
|
|
|
|
if (!ranToCompletion)
|
|
{
|
|
try
|
|
{
|
|
_logger.LogWarning("Killing ffmpeg subtitle extraction process");
|
|
|
|
process.Kill();
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
_logger.LogError(ex, "Error killing subtitle extraction process");
|
|
}
|
|
}
|
|
|
|
exitCode = ranToCompletion ? process.ExitCode : -1;
|
|
}
|
|
|
|
var failed = false;
|
|
|
|
if (exitCode == -1)
|
|
{
|
|
failed = true;
|
|
|
|
try
|
|
{
|
|
_logger.LogWarning("Deleting extracted subtitle due to failure: {Path}", outputPath);
|
|
_fileSystem.DeleteFile(outputPath);
|
|
}
|
|
catch (FileNotFoundException)
|
|
{
|
|
|
|
}
|
|
catch (IOException ex)
|
|
{
|
|
_logger.LogError(ex, "Error deleting extracted subtitle {Path}", outputPath);
|
|
}
|
|
}
|
|
else if (!File.Exists(outputPath))
|
|
{
|
|
failed = true;
|
|
}
|
|
|
|
if (failed)
|
|
{
|
|
var msg = $"ffmpeg subtitle extraction failed for {inputPath} to {outputPath}";
|
|
|
|
_logger.LogError(msg);
|
|
|
|
throw new Exception(msg);
|
|
}
|
|
else
|
|
{
|
|
var msg = $"ffmpeg subtitle extraction completed for {inputPath} to {outputPath}";
|
|
|
|
_logger.LogInformation(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.LogInformation("Setting ass font within {File}", file);
|
|
|
|
string text;
|
|
Encoding encoding;
|
|
|
|
using (var fileStream = File.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 = new FileStream(file, FileMode.Create, FileAccess.Write, FileShare.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);
|
|
}
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public async Task<string> GetSubtitleFileCharacterSet(string path, string language, MediaProtocol protocol, CancellationToken cancellationToken)
|
|
{
|
|
using (var stream = await GetStream(path, protocol, cancellationToken).ConfigureAwait(false))
|
|
{
|
|
var charset = CharsetDetector.DetectFromStream(stream).Detected?.EncodingName;
|
|
|
|
// UTF16 is automatically converted to UTF8 by FFmpeg, do not specify a character encoding
|
|
if ((path.EndsWith(".ass") || path.EndsWith(".ssa") || path.EndsWith(".srt"))
|
|
&& (string.Equals(charset, "utf-16le", StringComparison.OrdinalIgnoreCase)
|
|
|| string.Equals(charset, "utf-16be", StringComparison.OrdinalIgnoreCase)))
|
|
{
|
|
charset = "";
|
|
}
|
|
|
|
_logger.LogDebug("charset {0} detected for {Path}", charset ?? "null", path);
|
|
|
|
return charset;
|
|
}
|
|
}
|
|
|
|
private Task<Stream> GetStream(string path, MediaProtocol protocol, CancellationToken cancellationToken)
|
|
{
|
|
switch (protocol)
|
|
{
|
|
case MediaProtocol.Http:
|
|
var opts = new HttpRequestOptions()
|
|
{
|
|
Url = path,
|
|
CancellationToken = cancellationToken,
|
|
|
|
// Needed for seeking
|
|
BufferContent = true
|
|
};
|
|
|
|
return _httpClient.Get(opts);
|
|
|
|
case MediaProtocol.File:
|
|
return Task.FromResult<Stream>(File.OpenRead(path));
|
|
default:
|
|
throw new ArgumentOutOfRangeException(nameof(protocol));
|
|
}
|
|
}
|
|
}
|
|
}
|