jellyfin/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs

620 lines
21 KiB
C#
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using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.IO;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.MediaInfo;
using System;
using System.Collections.Concurrent;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.MediaEncoding.Subtitles
{
public class SubtitleEncoder : ISubtitleEncoder
{
private readonly ILibraryManager _libraryManager;
private readonly ILogger _logger;
private readonly IApplicationPaths _appPaths;
private readonly IFileSystem _fileSystem;
private readonly IMediaEncoder _mediaEncoder;
public SubtitleEncoder(ILibraryManager libraryManager, ILogger logger, IApplicationPaths appPaths, IFileSystem fileSystem, IMediaEncoder mediaEncoder)
{
_libraryManager = libraryManager;
_logger = logger;
_appPaths = appPaths;
_fileSystem = fileSystem;
_mediaEncoder = mediaEncoder;
}
private string SubtitleCachePath
{
get
{
return Path.Combine(_appPaths.CachePath, "subtitles");
}
}
public async Task<Stream> ConvertSubtitles(Stream stream,
string inputFormat,
string outputFormat,
CancellationToken cancellationToken)
{
var ms = new MemoryStream();
try
{
if (string.Equals(inputFormat, outputFormat, StringComparison.OrdinalIgnoreCase))
{
await stream.CopyToAsync(ms, 81920, cancellationToken).ConfigureAwait(false);
}
else
{
var trackInfo = await GetTrackInfo(stream, inputFormat, cancellationToken).ConfigureAwait(false);
var writer = GetWriter(outputFormat);
writer.Write(trackInfo, ms, cancellationToken);
}
ms.Position = 0;
}
catch
{
ms.Dispose();
throw;
}
return ms;
}
public async Task<Stream> GetSubtitles(string itemId,
string mediaSourceId,
int subtitleStreamIndex,
string outputFormat,
CancellationToken cancellationToken)
{
var subtitle = await GetSubtitleStream(itemId, mediaSourceId, subtitleStreamIndex, cancellationToken)
.ConfigureAwait(false);
using (var stream = subtitle.Item1)
{
var inputFormat = subtitle.Item2;
return await ConvertSubtitles(stream, inputFormat, outputFormat, cancellationToken).ConfigureAwait(false);
}
}
private async Task<Tuple<Stream, string>> GetSubtitleStream(string itemId,
string mediaSourceId,
int subtitleStreamIndex,
CancellationToken cancellationToken)
{
var item = (Video)_libraryManager.GetItemById(new Guid(itemId));
var mediaSource = item.GetMediaSources(false)
.First(i => string.Equals(i.Id, mediaSourceId));
var subtitleStream = mediaSource.MediaStreams
.First(i => i.Type == MediaStreamType.Subtitle && i.Index == subtitleStreamIndex);
var inputType = mediaSource.LocationType == LocationType.Remote ? InputType.Url : InputType.File;
var inputFiles = new[] { mediaSource.Path };
if (mediaSource.VideoType.HasValue)
{
if (mediaSource.VideoType.Value == VideoType.BluRay)
{
inputType = InputType.Bluray;
var mediaSourceItem = (Video)_libraryManager.GetItemById(new Guid(mediaSourceId));
inputFiles = mediaSourceItem.GetPlayableStreamFiles().ToArray();
}
else if (mediaSource.VideoType.Value == VideoType.Dvd)
{
inputType = InputType.Dvd;
var mediaSourceItem = (Video)_libraryManager.GetItemById(new Guid(mediaSourceId));
inputFiles = mediaSourceItem.GetPlayableStreamFiles().ToArray();
}
}
var fileInfo = await GetReadableFile(mediaSource.Path, inputFiles, inputType, subtitleStream, cancellationToken).ConfigureAwait(false);
var stream = File.OpenRead(fileInfo.Item1);
return new Tuple<Stream, string>(stream, fileInfo.Item2);
}
private async Task<Tuple<string, string>> GetReadableFile(string mediaPath,
string[] inputFiles,
InputType type,
MediaStream subtitleStream,
CancellationToken cancellationToken)
{
if (!subtitleStream.IsExternal)
{
// Extract
var outputPath = GetSubtitleCachePath(mediaPath, subtitleStream.Index, ".ass");
await ExtractTextSubtitle(inputFiles, type, subtitleStream.Index, false, outputPath, cancellationToken)
.ConfigureAwait(false);
return new Tuple<string, string>(outputPath, "ass");
}
var currentFormat = (Path.GetExtension(subtitleStream.Path) ?? subtitleStream.Codec)
.TrimStart('.');
if (GetReader(currentFormat, false) == null)
{
// Convert
var outputPath = GetSubtitleCachePath(mediaPath, subtitleStream.Index, ".ass");
await ConvertTextSubtitleToAss(subtitleStream.Path, outputPath, subtitleStream.Language, cancellationToken)
.ConfigureAwait(false);
return new Tuple<string, string>(outputPath, "ass");
}
return new Tuple<string, string>(subtitleStream.Path, currentFormat);
}
private async Task<SubtitleTrackInfo> GetTrackInfo(Stream stream,
string inputFormat,
CancellationToken cancellationToken)
{
var reader = GetReader(inputFormat, true);
return reader.Parse(stream, cancellationToken);
}
private ISubtitleParser GetReader(string format, bool throwIfMissing)
{
if (string.IsNullOrEmpty(format))
{
throw new ArgumentNullException("format");
}
if (string.Equals(format, SubtitleFormat.SRT, StringComparison.OrdinalIgnoreCase))
{
return new SrtParser();
}
if (string.Equals(format, SubtitleFormat.SSA, StringComparison.OrdinalIgnoreCase) ||
string.Equals(format, SubtitleFormat.ASS, StringComparison.OrdinalIgnoreCase))
{
return new SsaParser();
}
if (throwIfMissing)
{
throw new ArgumentException("Unsupported format: " + format);
}
return null;
}
private ISubtitleWriter GetWriter(string format)
{
if (string.IsNullOrEmpty(format))
{
throw new ArgumentNullException("format");
}
if (string.Equals(format, SubtitleFormat.VTT, StringComparison.OrdinalIgnoreCase))
{
return new VttWriter();
}
throw new ArgumentException("Unsupported format: " + format);
}
/// <summary>
/// The _semaphoreLocks
/// </summary>
private readonly ConcurrentDictionary<string, SemaphoreSlim> _semaphoreLocks =
new ConcurrentDictionary<string, SemaphoreSlim>();
/// <summary>
/// Gets the lock.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>System.Object.</returns>
private SemaphoreSlim GetLock(string filename)
{
return _semaphoreLocks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
}
/// <summary>
/// Converts the text subtitle to ass.
/// </summary>
/// <param name="inputPath">The input path.</param>
/// <param name="outputPath">The output path.</param>
/// <param name="language">The language.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
public async Task ConvertTextSubtitleToAss(string inputPath, string outputPath, string language,
CancellationToken cancellationToken)
{
var semaphore = GetLock(outputPath);
await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
if (!File.Exists(outputPath))
{
await ConvertTextSubtitleToAssInternal(inputPath, outputPath, language).ConfigureAwait(false);
}
}
finally
{
semaphore.Release();
}
}
/// <summary>
/// Converts the text subtitle to ass.
/// </summary>
/// <param name="inputPath">The input path.</param>
/// <param name="outputPath">The output path.</param>
/// <param name="language">The language.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">inputPath
/// or
/// outputPath</exception>
/// <exception cref="System.ApplicationException"></exception>
private async Task ConvertTextSubtitleToAssInternal(string inputPath, string outputPath, string language)
{
if (string.IsNullOrEmpty(inputPath))
{
throw new ArgumentNullException("inputPath");
}
if (string.IsNullOrEmpty(outputPath))
{
throw new ArgumentNullException("outputPath");
}
var encodingParam = string.IsNullOrEmpty(language)
? string.Empty
: _mediaEncoder.GetSubtitleLanguageEncodingParam(inputPath, language);
if (!string.IsNullOrEmpty(encodingParam))
{
encodingParam = " -sub_charenc " + encodingParam;
}
var process = new Process
{
StartInfo = new ProcessStartInfo
{
RedirectStandardOutput = false,
RedirectStandardError = true,
CreateNoWindow = true,
UseShellExecute = false,
FileName = _mediaEncoder.EncoderPath,
Arguments =
string.Format("{0} -i \"{1}\" -c:s ass \"{2}\"", encodingParam, inputPath, outputPath),
WindowStyle = ProcessWindowStyle.Hidden,
ErrorDialog = false
}
};
_logger.Debug("{0} {1}", process.StartInfo.FileName, process.StartInfo.Arguments);
var logFilePath = Path.Combine(_appPaths.LogDirectoryPath, "ffmpeg-sub-convert-" + Guid.NewGuid() + ".txt");
Directory.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;
}
var logTask = process.StandardError.BaseStream.CopyToAsync(logFileStream);
var ranToCompletion = process.WaitForExit(60000);
if (!ranToCompletion)
{
try
{
_logger.Info("Killing ffmpeg subtitle conversion process");
process.Kill();
process.WaitForExit(1000);
await logTask.ConfigureAwait(false);
}
catch (Exception ex)
{
_logger.ErrorException("Error killing subtitle conversion process", ex);
}
finally
{
logFileStream.Dispose();
}
}
var exitCode = ranToCompletion ? process.ExitCode : -1;
process.Dispose();
var failed = false;
if (exitCode == -1)
{
failed = true;
if (File.Exists(outputPath))
{
try
{
_logger.Info("Deleting converted subtitle due to failure: ", outputPath);
File.Delete(outputPath);
}
catch (IOException ex)
{
_logger.ErrorException("Error deleting converted subtitle {0}", ex, outputPath);
}
}
}
else if (!File.Exists(outputPath))
{
failed = true;
}
if (failed)
{
var msg = string.Format("ffmpeg subtitle converted failed for {0}", inputPath);
_logger.Error(msg);
throw new ApplicationException(msg);
}
await SetAssFont(outputPath).ConfigureAwait(false);
}
/// <summary>
/// Extracts the text subtitle.
/// </summary>
/// <param name="inputFiles">The input files.</param>
/// <param name="type">The type.</param>
/// <param name="subtitleStreamIndex">Index of the subtitle stream.</param>
/// <param name="copySubtitleStream">if set to true, copy stream instead of converting.</param>
/// <param name="outputPath">The output path.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentException">Must use inputPath list overload</exception>
private async Task ExtractTextSubtitle(string[] inputFiles, InputType type, int subtitleStreamIndex,
bool copySubtitleStream, string outputPath, CancellationToken cancellationToken)
{
var semaphore = GetLock(outputPath);
await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
if (!File.Exists(outputPath))
{
await ExtractTextSubtitleInternal(_mediaEncoder.GetInputArgument(inputFiles, type), subtitleStreamIndex,
copySubtitleStream, outputPath, cancellationToken).ConfigureAwait(false);
}
}
finally
{
semaphore.Release();
}
}
/// <summary>
/// Extracts the text subtitle.
/// </summary>
/// <param name="inputPath">The input path.</param>
/// <param name="subtitleStreamIndex">Index of the subtitle stream.</param>
/// <param name="copySubtitleStream">if set to true, copy stream instead of converting.</param>
/// <param name="outputPath">The output path.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">inputPath
/// or
/// outputPath
/// or
/// cancellationToken</exception>
/// <exception cref="System.ApplicationException"></exception>
private async Task ExtractTextSubtitleInternal(string inputPath, int subtitleStreamIndex,
bool copySubtitleStream, string outputPath, CancellationToken cancellationToken)
{
if (string.IsNullOrEmpty(inputPath))
{
throw new ArgumentNullException("inputPath");
}
if (string.IsNullOrEmpty(outputPath))
{
throw new ArgumentNullException("outputPath");
}
string processArgs = string.Format("-i {0} -map 0:{1} -an -vn -c:s ass \"{2}\"", inputPath,
subtitleStreamIndex, outputPath);
if (copySubtitleStream)
{
processArgs = string.Format("-i {0} -map 0:{1} -an -vn -c:s copy \"{2}\"", inputPath,
subtitleStreamIndex, outputPath);
}
var process = new Process
{
StartInfo = new ProcessStartInfo
{
CreateNoWindow = true,
UseShellExecute = false,
RedirectStandardOutput = false,
RedirectStandardError = true,
FileName = _mediaEncoder.EncoderPath,
Arguments = processArgs,
WindowStyle = ProcessWindowStyle.Hidden,
ErrorDialog = false
}
};
_logger.Debug("{0} {1}", process.StartInfo.FileName, process.StartInfo.Arguments);
var logFilePath = Path.Combine(_appPaths.LogDirectoryPath, "ffmpeg-sub-extract-" + Guid.NewGuid() + ".txt");
Directory.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(60000);
if (!ranToCompletion)
{
try
{
_logger.Info("Killing ffmpeg subtitle extraction process");
process.Kill();
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;
if (File.Exists(outputPath))
{
try
{
_logger.Info("Deleting extracted subtitle due to failure: ", outputPath);
File.Delete(outputPath);
}
catch (IOException ex)
{
_logger.ErrorException("Error deleting extracted subtitle {0}", ex, outputPath);
}
}
}
else if (!File.Exists(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);
}
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, int subtitleStreamIndex, string outputSubtitleExtension)
{
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);
}
}
}