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jellyfin/Emby.Server.Implementations/LiveTv/TunerHosts/LiveStream.cs

236 lines
7.2 KiB

#pragma warning disable CS1591
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Controller.Library;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.LiveTv;
using Microsoft.Extensions.Logging;
namespace Emby.Server.Implementations.LiveTv.TunerHosts
{
public class LiveStream : ILiveStream
{
private readonly IConfigurationManager _configurationManager;
protected readonly IFileSystem FileSystem;
protected readonly IStreamHelper StreamHelper;
protected string TempFilePath;
protected readonly ILogger Logger;
protected readonly CancellationTokenSource LiveStreamCancellationTokenSource = new CancellationTokenSource();
public LiveStream(
MediaSourceInfo mediaSource,
TunerHostInfo tuner,
IFileSystem fileSystem,
ILogger logger,
IConfigurationManager configurationManager,
IStreamHelper streamHelper)
{
OriginalMediaSource = mediaSource;
FileSystem = fileSystem;
MediaSource = mediaSource;
Logger = logger;
EnableStreamSharing = true;
UniqueId = Guid.NewGuid().ToString("N", CultureInfo.InvariantCulture);
if (tuner != null)
{
TunerHostId = tuner.Id;
}
_configurationManager = configurationManager;
StreamHelper = streamHelper;
ConsumerCount = 1;
SetTempFilePath("ts");
}
protected virtual int EmptyReadLimit => 1000;
public MediaSourceInfo OriginalMediaSource { get; set; }
public MediaSourceInfo MediaSource { get; set; }
public int ConsumerCount { get; set; }
public string OriginalStreamId { get; set; }
public bool EnableStreamSharing { get; set; }
public string UniqueId { get; }
public string TunerHostId { get; }
public DateTime DateOpened { get; protected set; }
protected void SetTempFilePath(string extension)
{
TempFilePath = Path.Combine(_configurationManager.GetTranscodePath(), UniqueId + "." + extension);
}
public virtual Task Open(CancellationToken openCancellationToken)
{
DateOpened = DateTime.UtcNow;
return Task.CompletedTask;
}
public Task Close()
{
EnableStreamSharing = false;
Logger.LogInformation("Closing {Type}", GetType().Name);
LiveStreamCancellationTokenSource.Cancel();
return Task.CompletedTask;
}
protected FileStream GetInputStream(string path, bool allowAsyncFileRead)
=> new FileStream(
path,
FileMode.Open,
FileAccess.Read,
FileShare.ReadWrite,
IODefaults.FileStreamBufferSize,
allowAsyncFileRead ? FileOptions.SequentialScan | FileOptions.Asynchronous : FileOptions.SequentialScan);
public Task DeleteTempFiles()
{
return DeleteTempFiles(GetStreamFilePaths());
}
protected async Task DeleteTempFiles(IEnumerable<string> paths, int retryCount = 0)
{
if (retryCount == 0)
{
Logger.LogInformation("Deleting temp files {0}", paths);
}
var failedFiles = new List<string>();
foreach (var path in paths)
{
if (!File.Exists(path))
{
continue;
}
try
{
FileSystem.DeleteFile(path);
}
catch (Exception ex)
{
Logger.LogError(ex, "Error deleting file {path}", path);
failedFiles.Add(path);
}
}
if (failedFiles.Count > 0 && retryCount <= 40)
{
await Task.Delay(500).ConfigureAwait(false);
await DeleteTempFiles(failedFiles, retryCount + 1).ConfigureAwait(false);
}
}
protected virtual List<string> GetStreamFilePaths()
{
return new List<string> { TempFilePath };
}
public async Task CopyToAsync(Stream stream, CancellationToken cancellationToken)
{
cancellationToken = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, LiveStreamCancellationTokenSource.Token).Token;
// use non-async filestream on windows along with read due to https://github.com/dotnet/corefx/issues/6039
var allowAsync = Environment.OSVersion.Platform != PlatformID.Win32NT;
bool seekFile = (DateTime.UtcNow - DateOpened).TotalSeconds > 10;
var nextFileInfo = GetNextFile(null);
var nextFile = nextFileInfo.file;
var isLastFile = nextFileInfo.isLastFile;
while (!string.IsNullOrEmpty(nextFile))
{
var emptyReadLimit = isLastFile ? EmptyReadLimit : 1;
await CopyFile(nextFile, seekFile, emptyReadLimit, allowAsync, stream, cancellationToken).ConfigureAwait(false);
seekFile = false;
nextFileInfo = GetNextFile(nextFile);
nextFile = nextFileInfo.file;
isLastFile = nextFileInfo.isLastFile;
}
Logger.LogInformation("Live Stream ended.");
}
private (string file, bool isLastFile) GetNextFile(string currentFile)
{
var files = GetStreamFilePaths();
if (string.IsNullOrEmpty(currentFile))
{
return (files.Last(), true);
}
var nextIndex = files.FindIndex(i => string.Equals(i, currentFile, StringComparison.OrdinalIgnoreCase)) + 1;
var isLastFile = nextIndex == files.Count - 1;
return (files.ElementAtOrDefault(nextIndex), isLastFile);
}
private async Task CopyFile(string path, bool seekFile, int emptyReadLimit, bool allowAsync, Stream stream, CancellationToken cancellationToken)
{
using (var inputStream = GetInputStream(path, allowAsync))
{
if (seekFile)
{
TrySeek(inputStream, -20000);
}
await StreamHelper.CopyToAsync(
inputStream,
stream,
IODefaults.CopyToBufferSize,
emptyReadLimit,
cancellationToken).ConfigureAwait(false);
}
}
private void TrySeek(FileStream stream, long offset)
{
if (!stream.CanSeek)
{
return;
}
try
{
stream.Seek(offset, SeekOrigin.End);
}
catch (IOException)
{
}
catch (ArgumentException)
{
}
catch (Exception ex)
{
Logger.LogError(ex, "Error seeking stream");
}
}
}
}