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add locking around subtitle extraction

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This commit is contained in:
Luke Pulverenti
2013-10-18 16:02:56 -04:00
parent e6829fcdf0
commit 088c77674b
2 changed files with 65 additions and 6 deletions
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67
MediaBrowser.Server.Implementations/MediaEncoder/MediaEncoder.cs
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@@ -1,4 +1,5 @@
using MediaBrowser.Common.Configuration;
using System.Collections.Concurrent;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.IO;
using MediaBrowser.Common.MediaInfo;
using MediaBrowser.Model.Entities;
@@ -84,6 +85,21 @@ namespace MediaBrowser.Server.Implementations.MediaEncoder
get { return FFMpegPath; }
}
/// <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>
/// Gets the media info.
/// </summary>
@@ -359,6 +375,35 @@ namespace MediaBrowser.Server.Implementations.MediaEncoder
((Process)sender).Dispose();
}
/// <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="offset">The offset.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
public async Task ConvertTextSubtitleToAss(string inputPath, string outputPath, string language, TimeSpan offset,
CancellationToken cancellationToken)
{
var semaphore = GetLock(outputPath);
await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
if (!File.Exists(outputPath))
{
await ConvertTextSubtitleToAssInternal(inputPath, outputPath, language, offset, cancellationToken).ConfigureAwait(false);
}
}
finally
{
semaphore.Release();
}
}
/// <summary>
/// Converts the text subtitle to ass.
/// </summary>
@@ -372,7 +417,7 @@ namespace MediaBrowser.Server.Implementations.MediaEncoder
/// or
/// outputPath</exception>
/// <exception cref="System.ApplicationException"></exception>
public async Task ConvertTextSubtitleToAss(string inputPath, string outputPath, string language, TimeSpan offset,
private async Task ConvertTextSubtitleToAssInternal(string inputPath, string outputPath, string language, TimeSpan offset,
CancellationToken cancellationToken)
{
if (string.IsNullOrEmpty(inputPath))
@@ -562,9 +607,23 @@ namespace MediaBrowser.Server.Implementations.MediaEncoder
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentException">Must use inputPath list overload</exception>
public Task ExtractTextSubtitle(string[] inputFiles, InputType type, int subtitleStreamIndex, TimeSpan offset, string outputPath, CancellationToken cancellationToken)
public async Task ExtractTextSubtitle(string[] inputFiles, InputType type, int subtitleStreamIndex, TimeSpan offset, string outputPath, CancellationToken cancellationToken)
{
return ExtractTextSubtitleInternal(GetInputArgument(inputFiles, type), subtitleStreamIndex, offset, outputPath, cancellationToken);
var semaphore = GetLock(outputPath);
await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
if (!File.Exists(outputPath))
{
await ExtractTextSubtitleInternal(GetInputArgument(inputFiles, type), subtitleStreamIndex, offset, outputPath, cancellationToken).ConfigureAwait(false);
}
}
finally
{
semaphore.Release();
}
}
/// <summary>