jellyfin-server/Emby.Server.Implementations/LiveTv/TunerHosts/HdHomerun/HdHomerunUdpStream.cs

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
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using Emby.Server.Implementations.IO;
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using MediaBrowser.Common.Net;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.MediaInfo;
using MediaBrowser.Model.Net;
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using MediaBrowser.Model.System;
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using System.Globalization;
using MediaBrowser.Controller.IO;
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namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
{
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public class HdHomerunUdpStream : LiveStream, IDirectStreamProvider
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{
private readonly ILogger _logger;
private readonly IServerApplicationHost _appHost;
private readonly ISocketFactory _socketFactory;
private readonly CancellationTokenSource _liveStreamCancellationTokenSource = new CancellationTokenSource();
private readonly TaskCompletionSource<bool> _liveStreamTaskCompletionSource = new TaskCompletionSource<bool>();
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private readonly IHdHomerunChannelCommands _channelCommands;
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private readonly int _numTuners;
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private readonly INetworkManager _networkManager;
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private readonly string _tempFilePath;
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private bool _enableFileBuffer = false;
private readonly MulticastStream _multicastStream;
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public HdHomerunUdpStream(MediaSourceInfo mediaSource, string originalStreamId, IHdHomerunChannelCommands channelCommands, int numTuners, IFileSystem fileSystem, IHttpClient httpClient, ILogger logger, IServerApplicationPaths appPaths, IServerApplicationHost appHost, ISocketFactory socketFactory, INetworkManager networkManager, IEnvironmentInfo environment)
: base(mediaSource, environment, fileSystem)
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{
_logger = logger;
_appHost = appHost;
_socketFactory = socketFactory;
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_networkManager = networkManager;
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OriginalStreamId = originalStreamId;
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_channelCommands = channelCommands;
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_numTuners = numTuners;
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_tempFilePath = Path.Combine(appPaths.TranscodingTempPath, UniqueId + ".ts");
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_multicastStream = new MulticastStream(_logger);
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}
protected override async Task OpenInternal(CancellationToken openCancellationToken)
{
_liveStreamCancellationTokenSource.Token.ThrowIfCancellationRequested();
var mediaSource = OriginalMediaSource;
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var uri = new Uri(mediaSource.Path);
var localPort = _networkManager.GetRandomUnusedUdpPort();
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_logger.Info("Opening HDHR UDP Live stream from {0}", uri.Host);
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var taskCompletionSource = new TaskCompletionSource<bool>();
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StartStreaming(uri.Host, localPort, taskCompletionSource, _liveStreamCancellationTokenSource.Token);
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//OpenedMediaSource.Protocol = MediaProtocol.File;
//OpenedMediaSource.Path = tempFile;
//OpenedMediaSource.ReadAtNativeFramerate = true;
OpenedMediaSource.Path = _appHost.GetLocalApiUrl("127.0.0.1") + "/LiveTv/LiveStreamFiles/" + UniqueId + "/stream.ts";
OpenedMediaSource.Protocol = MediaProtocol.Http;
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//OpenedMediaSource.SupportsDirectPlay = false;
//OpenedMediaSource.SupportsDirectStream = true;
//OpenedMediaSource.SupportsTranscoding = true;
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await taskCompletionSource.Task.ConfigureAwait(false);
//await Task.Delay(5000).ConfigureAwait(false);
}
public override Task Close()
{
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_logger.Info("Closing HDHR UDP live stream");
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_liveStreamCancellationTokenSource.Cancel();
return _liveStreamTaskCompletionSource.Task;
}
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private Task StartStreaming(string remoteIp, int localPort, TaskCompletionSource<bool> openTaskCompletionSource, CancellationToken cancellationToken)
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{
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return Task.Run(async () =>
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{
var isFirstAttempt = true;
using (var udpClient = _socketFactory.CreateUdpSocket(localPort))
{
using (var hdHomerunManager = new HdHomerunManager(_socketFactory))
{
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var remoteAddress = _networkManager.ParseIpAddress(remoteIp);
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IpAddressInfo localAddress = null;
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using (var tcpSocket = _socketFactory.CreateSocket(remoteAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp, false))
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{
try
{
tcpSocket.Connect(new IpEndPointInfo(remoteAddress, HdHomerunManager.HdHomeRunPort));
localAddress = tcpSocket.LocalEndPoint.IpAddress;
tcpSocket.Close();
}
catch (Exception)
{
_logger.Error("Unable to determine local ip address for Legacy HDHomerun stream.");
return;
}
}
while (!cancellationToken.IsCancellationRequested)
{
try
{
// send url to start streaming
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await hdHomerunManager.StartStreaming(remoteAddress, localAddress, localPort, _channelCommands, _numTuners, cancellationToken).ConfigureAwait(false);
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_logger.Info("Opened HDHR UDP stream from {0}", remoteAddress);
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if (!cancellationToken.IsCancellationRequested)
{
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if (_enableFileBuffer)
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{
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FileSystem.CreateDirectory(FileSystem.GetDirectoryName(_tempFilePath));
using (var fileStream = FileSystem.GetFileStream(_tempFilePath, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read, FileOpenOptions.None))
{
CopyTo(udpClient, fileStream, openTaskCompletionSource, cancellationToken);
}
}
else
{
await _multicastStream.CopyUntilCancelled(new UdpClientStream(udpClient), () => Resolve(openTaskCompletionSource), cancellationToken).ConfigureAwait(false);
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}
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}
}
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catch (OperationCanceledException ex)
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{
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_logger.Info("HDHR UDP stream cancelled or timed out from {0}", remoteAddress);
openTaskCompletionSource.TrySetException(ex);
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break;
}
catch (Exception ex)
{
if (isFirstAttempt)
{
_logger.ErrorException("Error opening live stream:", ex);
openTaskCompletionSource.TrySetException(ex);
break;
}
_logger.ErrorException("Error copying live stream, will reopen", ex);
}
isFirstAttempt = false;
}
await hdHomerunManager.StopStreaming().ConfigureAwait(false);
_liveStreamTaskCompletionSource.TrySetResult(true);
}
}
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await DeleteTempFile(_tempFilePath).ConfigureAwait(false);
});
}
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private void Resolve(TaskCompletionSource<bool> openTaskCompletionSource)
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{
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Task.Run(() =>
{
openTaskCompletionSource.TrySetResult(true);
});
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}
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public async Task CopyToAsync(Stream outputStream, CancellationToken cancellationToken)
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{
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if (!_enableFileBuffer)
{
await _multicastStream.CopyToAsync(outputStream, cancellationToken).ConfigureAwait(false);
return;
}
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var path = _tempFilePath;
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long startPosition = -20000;
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if (startPosition < 0)
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{
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var length = FileSystem.GetFileInfo(path).Length;
startPosition = Math.Max(length - startPosition, 0);
}
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_logger.Info("Live stream starting position is {0} bytes", startPosition.ToString(CultureInfo.InvariantCulture));
var allowAsync = Environment.OperatingSystem != MediaBrowser.Model.System.OperatingSystem.Windows;
// use non-async filestream along with read due to https://github.com/dotnet/corefx/issues/6039
using (var inputStream = GetInputStream(path, startPosition, allowAsync))
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{
if (startPosition > 0)
{
inputStream.Position = startPosition;
}
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while (!cancellationToken.IsCancellationRequested)
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{
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long bytesRead;
if (allowAsync)
{
bytesRead = await AsyncStreamCopier.CopyStream(inputStream, outputStream, 81920, 2, cancellationToken).ConfigureAwait(false);
}
else
{
StreamHelper.CopyTo(inputStream, outputStream, 81920, cancellationToken);
bytesRead = 1;
}
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//var position = fs.Position;
//_logger.Debug("Streamed {0} bytes to position {1} from file {2}", bytesRead, position, path);
if (bytesRead == 0)
{
await Task.Delay(100, cancellationToken).ConfigureAwait(false);
}
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}
}
}
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private static int RtpHeaderBytes = 12;
private void CopyTo(ISocket udpClient, Stream target, TaskCompletionSource<bool> openTaskCompletionSource, CancellationToken cancellationToken)
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{
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var source = _socketFactory.CreateNetworkStream(udpClient, false);
var bufferSize = 81920;
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byte[] buffer = new byte[bufferSize];
int read;
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var resolved = false;
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while ((read = source.Read(buffer, 0, buffer.Length)) != 0)
{
cancellationToken.ThrowIfCancellationRequested();
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read -= RtpHeaderBytes;
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if (read > 0)
{
target.Write(buffer, RtpHeaderBytes, read);
}
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if (!resolved)
{
resolved = true;
Resolve(openTaskCompletionSource);
}
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}
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//var copier = new AsyncStreamCopier(source, target, 0, cancellationToken, false, bufferSize, bufferCount);
//copier.IndividualReadOffset = RtpHeaderBytes;
//var taskCompletion = new TaskCompletionSource<long>();
//copier.TaskCompletionSource = taskCompletion;
//var result = copier.BeginCopy(StreamCopyCallback, copier);
//if (openTaskCompletionSource != null)
//{
// Resolve(openTaskCompletionSource);
// openTaskCompletionSource = null;
//}
//if (result.CompletedSynchronously)
//{
// StreamCopyCallback(result);
//}
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//cancellationToken.Register(() => taskCompletion.TrySetCanceled());
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//return taskCompletion.Task;
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}
private void StreamCopyCallback(IAsyncResult result)
{
var copier = (AsyncStreamCopier)result.AsyncState;
var taskCompletion = copier.TaskCompletionSource;
try
{
copier.EndCopy(result);
taskCompletion.TrySetResult(0);
}
catch (Exception ex)
{
taskCompletion.TrySetException(ex);
}
}
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public class UdpClientStream : Stream
{
private static int RtpHeaderBytes = 12;
private static int PacketSize = 1316;
private readonly ISocket _udpClient;
bool disposed;
public UdpClientStream(ISocket udpClient) : base()
{
_udpClient = udpClient;
}
public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
if (offset + count < 0)
throw new ArgumentOutOfRangeException("offset + count must not be negative", "offset+count");
if (offset + count > buffer.Length)
throw new ArgumentException("offset + count must not be greater than the length of buffer", "offset+count");
if (disposed)
throw new ObjectDisposedException(typeof(UdpClientStream).ToString());
// This will always receive a 1328 packet size (PacketSize + RtpHeaderSize)
// The RTP header will be stripped so see how many reads we need to make to fill the buffer.
int numReads = count / PacketSize;
int totalBytesRead = 0;
byte[] receiveBuffer = new byte[81920];
for (int i = 0; i < numReads; ++i)
{
var data = await _udpClient.ReceiveAsync(receiveBuffer, 0, receiveBuffer.Length, cancellationToken).ConfigureAwait(false);
var bytesRead = data.ReceivedBytes - RtpHeaderBytes;
// remove rtp header
Buffer.BlockCopy(data.Buffer, RtpHeaderBytes, buffer, offset, bytesRead);
offset += bytesRead;
totalBytesRead += bytesRead;
}
return totalBytesRead;
}
public override int Read(byte[] buffer, int offset, int count)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
if (offset + count < 0)
throw new ArgumentOutOfRangeException("offset + count must not be negative", "offset+count");
if (offset + count > buffer.Length)
throw new ArgumentException("offset + count must not be greater than the length of buffer", "offset+count");
if (disposed)
throw new ObjectDisposedException(typeof(UdpClientStream).ToString());
// This will always receive a 1328 packet size (PacketSize + RtpHeaderSize)
// The RTP header will be stripped so see how many reads we need to make to fill the buffer.
int numReads = count / PacketSize;
int totalBytesRead = 0;
byte[] receiveBuffer = new byte[81920];
for (int i = 0; i < numReads; ++i)
{
var receivedBytes = _udpClient.Receive(receiveBuffer, 0, receiveBuffer.Length);
var bytesRead = receivedBytes - RtpHeaderBytes;
// remove rtp header
Buffer.BlockCopy(receiveBuffer, RtpHeaderBytes, buffer, offset, bytesRead);
offset += bytesRead;
totalBytesRead += bytesRead;
}
return totalBytesRead;
}
protected override void Dispose(bool disposing)
{
disposed = true;
}
public override bool CanRead
{
get
{
throw new NotImplementedException();
}
}
public override bool CanSeek
{
get
{
throw new NotImplementedException();
}
}
public override bool CanWrite
{
get
{
throw new NotImplementedException();
}
}
public override long Length
{
get
{
throw new NotImplementedException();
}
}
public override long Position
{
get
{
throw new NotImplementedException();
}
set
{
throw new NotImplementedException();
}
}
public override void Flush()
{
throw new NotImplementedException();
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotImplementedException();
}
public override void SetLength(long value)
{
throw new NotImplementedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotImplementedException();
}
}
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}
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}