jellyfin/MediaBrowser.Api/Playback/Progressive/ProgressiveStreamWriter.cs
2016-03-27 23:11:27 +02:00

185 lines
5.8 KiB
C#

using MediaBrowser.Model.Logging;
using ServiceStack.Web;
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using CommonIO;
namespace MediaBrowser.Api.Playback.Progressive
{
public class ProgressiveStreamWriter : IStreamWriter, IHasOptions
{
private string Path { get; set; }
private ILogger Logger { get; set; }
private readonly IFileSystem _fileSystem;
private readonly TranscodingJob _job;
/// <summary>
/// The _options
/// </summary>
private readonly IDictionary<string, string> _options = new Dictionary<string, string>();
/// <summary>
/// Gets the options.
/// </summary>
/// <value>The options.</value>
public IDictionary<string, string> Options
{
get { return _options; }
}
/// <summary>
/// Initializes a new instance of the <see cref="ProgressiveStreamWriter" /> class.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="logger">The logger.</param>
/// <param name="fileSystem">The file system.</param>
public ProgressiveStreamWriter(string path, ILogger logger, IFileSystem fileSystem, TranscodingJob job)
{
Path = path;
Logger = logger;
_fileSystem = fileSystem;
_job = job;
}
/// <summary>
/// Writes to.
/// </summary>
/// <param name="responseStream">The response stream.</param>
public void WriteTo(Stream responseStream)
{
WriteToInternal(responseStream);
}
/// <summary>
/// Writes to async.
/// </summary>
/// <param name="responseStream">The response stream.</param>
/// <returns>Task.</returns>
private void WriteToInternal(Stream responseStream)
{
try
{
var task = new ProgressiveFileCopier(_fileSystem, _job, Logger).StreamFile(Path, responseStream);
Task.WaitAll(task);
}
catch (IOException)
{
// These error are always the same so don't dump the whole stack trace
Logger.Error("Error streaming media. The client has most likely disconnected or transcoding has failed.");
throw;
}
catch (Exception ex)
{
Logger.ErrorException("Error streaming media. The client has most likely disconnected or transcoding has failed.", ex);
throw;
}
finally
{
if (_job != null)
{
ApiEntryPoint.Instance.OnTranscodeEndRequest(_job);
}
}
}
}
public class ProgressiveFileCopier
{
private readonly IFileSystem _fileSystem;
private readonly TranscodingJob _job;
private readonly ILogger _logger;
// 256k
private const int BufferSize = 262144;
private long _bytesWritten = 0;
public ProgressiveFileCopier(IFileSystem fileSystem, TranscodingJob job, ILogger logger)
{
_fileSystem = fileSystem;
_job = job;
_logger = logger;
}
public async Task StreamFile(string path, Stream outputStream)
{
var eofCount = 0;
long position = 0;
using (var fs = _fileSystem.GetFileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, false))
{
while (eofCount < 15)
{
CopyToInternal(fs, outputStream, BufferSize);
var fsPosition = fs.Position;
var bytesRead = fsPosition - position;
//Logger.Debug("Streamed {0} bytes from file {1}", bytesRead, path);
if (bytesRead == 0)
{
if (_job == null || _job.HasExited)
{
eofCount++;
}
await Task.Delay(100).ConfigureAwait(false);
}
else
{
eofCount = 0;
}
position = fsPosition;
}
}
}
private void CopyToInternal(Stream source, Stream destination, int bufferSize)
{
var array = new byte[bufferSize];
int count;
while ((count = source.Read(array, 0, array.Length)) != 0)
{
//if (_job != null)
//{
// var didPause = false;
// var totalPauseTime = 0;
// if (_job.IsUserPaused)
// {
// _logger.Debug("Pausing writing to network stream while user has paused playback.");
// while (_job.IsUserPaused && totalPauseTime < 30000)
// {
// didPause = true;
// var pauseTime = 500;
// totalPauseTime += pauseTime;
// await Task.Delay(pauseTime).ConfigureAwait(false);
// }
// }
// if (didPause)
// {
// _logger.Debug("Resuming writing to network stream due to user unpausing playback.");
// }
//}
destination.Write(array, 0, count);
_bytesWritten += count;
if (_job != null)
{
_job.BytesDownloaded = Math.Max(_job.BytesDownloaded ?? _bytesWritten, _bytesWritten);
}
}
}
}
}