528 lines
20 KiB
C#
528 lines
20 KiB
C#
using System;
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using System.Buffers;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Controller.LiveTv;
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namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
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{
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public interface IHdHomerunChannelCommands
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{
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IEnumerable<(string, string)> GetCommands();
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}
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public class LegacyHdHomerunChannelCommands : IHdHomerunChannelCommands
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{
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private string _channel;
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private string _program;
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public LegacyHdHomerunChannelCommands(string url)
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{
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// parse url for channel and program
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var regExp = new Regex(@"\/ch(\d+)-?(\d*)");
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var match = regExp.Match(url);
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if (match.Success)
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{
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_channel = match.Groups[1].Value;
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_program = match.Groups[2].Value;
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}
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}
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public IEnumerable<(string, string)> GetCommands()
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{
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if (!string.IsNullOrEmpty(_channel))
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{
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yield return ("channel", _channel);
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}
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if (!string.IsNullOrEmpty(_program))
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{
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yield return ("program", _program);
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}
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}
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}
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public class HdHomerunChannelCommands : IHdHomerunChannelCommands
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{
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private string _channel;
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private string _profile;
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public HdHomerunChannelCommands(string channel, string profile)
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{
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_channel = channel;
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_profile = profile;
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}
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public IEnumerable<(string, string)> GetCommands()
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{
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if (!string.IsNullOrEmpty(_channel))
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{
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if (!string.IsNullOrEmpty(_profile)
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&& !string.Equals(_profile, "native", StringComparison.OrdinalIgnoreCase))
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{
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yield return ("vchannel", $"{_channel} transcode={_profile}");
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}
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else
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{
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yield return ("vchannel", _channel);
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}
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}
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}
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}
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public class HdHomerunManager : IDisposable
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{
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public const int HdHomeRunPort = 65001;
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// Message constants
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private const byte GetSetName = 3;
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private const byte GetSetValue = 4;
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private const byte GetSetLockkey = 21;
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private const ushort GetSetRequest = 4;
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private const ushort GetSetReply = 5;
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private uint? _lockkey = null;
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private int _activeTuner = -1;
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private IPEndPoint _remoteEndPoint;
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private TcpClient _tcpClient;
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public void Dispose()
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{
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using (var socket = _tcpClient)
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{
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if (socket != null)
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{
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_tcpClient = null;
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StopStreaming(socket).GetAwaiter().GetResult();
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}
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}
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}
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public async Task<bool> CheckTunerAvailability(IPAddress remoteIp, int tuner, CancellationToken cancellationToken)
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{
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using (var client = new TcpClient(new IPEndPoint(remoteIp, HdHomeRunPort)))
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using (var stream = client.GetStream())
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{
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return await CheckTunerAvailability(stream, tuner, cancellationToken).ConfigureAwait(false);
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}
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}
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private static async Task<bool> CheckTunerAvailability(NetworkStream stream, int tuner, CancellationToken cancellationToken)
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{
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var lockkeyMsg = CreateGetMessage(tuner, "lockkey");
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await stream.WriteAsync(lockkeyMsg, 0, lockkeyMsg.Length, cancellationToken).ConfigureAwait(false);
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byte[] buffer = ArrayPool<byte>.Shared.Rent(8192);
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try
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{
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int receivedBytes = await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false);
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ParseReturnMessage(buffer, receivedBytes, out string returnVal);
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return string.Equals(returnVal, "none", StringComparison.OrdinalIgnoreCase);
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}
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finally
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{
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ArrayPool<byte>.Shared.Return(buffer);
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}
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}
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public async Task StartStreaming(IPAddress remoteIp, IPAddress localIp, int localPort, IHdHomerunChannelCommands commands, int numTuners, CancellationToken cancellationToken)
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{
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_remoteEndPoint = new IPEndPoint(remoteIp, HdHomeRunPort);
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_tcpClient = new TcpClient(_remoteEndPoint);
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if (!_lockkey.HasValue)
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{
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var rand = new Random();
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_lockkey = (uint)rand.Next();
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}
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var lockKeyValue = _lockkey.Value;
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var stream = _tcpClient.GetStream();
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byte[] buffer = ArrayPool<byte>.Shared.Rent(8192);
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try
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{
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for (int i = 0; i < numTuners; ++i)
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{
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if (!await CheckTunerAvailability(stream, i, cancellationToken).ConfigureAwait(false))
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{
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continue;
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}
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_activeTuner = i;
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var lockKeyString = string.Format("{0:d}", lockKeyValue);
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var lockkeyMsg = CreateSetMessage(i, "lockkey", lockKeyString, null);
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await stream.WriteAsync(lockkeyMsg, 0, lockkeyMsg.Length, cancellationToken).ConfigureAwait(false);
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int receivedBytes = await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false);
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// parse response to make sure it worked
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if (!ParseReturnMessage(buffer, receivedBytes, out _))
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{
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continue;
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}
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var commandList = commands.GetCommands();
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foreach (var command in commandList)
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{
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var channelMsg = CreateSetMessage(i, command.Item1, command.Item2, lockKeyValue);
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await stream.WriteAsync(channelMsg, 0, channelMsg.Length, cancellationToken).ConfigureAwait(false);
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receivedBytes = await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false);
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// parse response to make sure it worked
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if (!ParseReturnMessage(buffer, receivedBytes, out _))
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{
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await ReleaseLockkey(_tcpClient, lockKeyValue).ConfigureAwait(false);
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continue;
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}
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}
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var targetValue = string.Format("rtp://{0}:{1}", localIp, localPort);
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var targetMsg = CreateSetMessage(i, "target", targetValue, lockKeyValue);
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await stream.WriteAsync(targetMsg, 0, targetMsg.Length, cancellationToken).ConfigureAwait(false);
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receivedBytes = await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false);
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// parse response to make sure it worked
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if (!ParseReturnMessage(buffer, receivedBytes, out _))
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{
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await ReleaseLockkey(_tcpClient, lockKeyValue).ConfigureAwait(false);
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continue;
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}
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return;
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}
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}
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finally
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{
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ArrayPool<byte>.Shared.Return(buffer);
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}
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_activeTuner = -1;
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throw new LiveTvConflictException();
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}
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public async Task ChangeChannel(IHdHomerunChannelCommands commands, CancellationToken cancellationToken)
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{
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if (!_lockkey.HasValue)
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{
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return;
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}
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using (var tcpClient = new TcpClient(_remoteEndPoint))
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using (var stream = tcpClient.GetStream())
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{
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var commandList = commands.GetCommands();
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byte[] buffer = ArrayPool<byte>.Shared.Rent(8192);
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try
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{
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foreach (var command in commandList)
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{
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var channelMsg = CreateSetMessage(_activeTuner, command.Item1, command.Item2, _lockkey);
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await stream.WriteAsync(channelMsg, 0, channelMsg.Length, cancellationToken).ConfigureAwait(false);
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int receivedBytes = await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false);
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// parse response to make sure it worked
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if (!ParseReturnMessage(buffer, receivedBytes, out _))
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{
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return;
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}
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}
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}
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finally
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{
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ArrayPool<byte>.Shared.Return(buffer);
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}
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}
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}
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public Task StopStreaming(TcpClient client)
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{
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var lockKey = _lockkey;
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if (!lockKey.HasValue)
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{
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return Task.CompletedTask;
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}
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return ReleaseLockkey(client, lockKey.Value);
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}
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private async Task ReleaseLockkey(TcpClient client, uint lockKeyValue)
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{
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var stream = client.GetStream();
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var releaseTarget = CreateSetMessage(_activeTuner, "target", "none", lockKeyValue);
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await stream.WriteAsync(releaseTarget, 0, releaseTarget.Length).ConfigureAwait(false);
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var buffer = ArrayPool<byte>.Shared.Rent(8192);
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try
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{
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await stream.ReadAsync(buffer, 0, buffer.Length).ConfigureAwait(false);
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var releaseKeyMsg = CreateSetMessage(_activeTuner, "lockkey", "none", lockKeyValue);
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_lockkey = null;
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await stream.WriteAsync(releaseKeyMsg, 0, releaseKeyMsg.Length).ConfigureAwait(false);
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await stream.ReadAsync(buffer, 0, buffer.Length).ConfigureAwait(false);
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}
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finally
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{
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ArrayPool<byte>.Shared.Return(buffer);
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}
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}
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private static byte[] CreateGetMessage(int tuner, string name)
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{
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var byteName = Encoding.UTF8.GetBytes(string.Format(CultureInfo.InvariantCulture, "/tuner{0}/{1}\0", tuner, name));
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int messageLength = byteName.Length + 10; // 4 bytes for header + 4 bytes for crc + 2 bytes for tag name and length
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var message = new byte[messageLength];
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int offset = InsertHeaderAndName(byteName, messageLength, message);
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bool flipEndian = BitConverter.IsLittleEndian;
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// calculate crc and insert at the end of the message
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var crcBytes = BitConverter.GetBytes(HdHomerunCrc.GetCrc32(message, messageLength - 4));
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if (flipEndian)
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{
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Array.Reverse(crcBytes);
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}
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Buffer.BlockCopy(crcBytes, 0, message, offset, 4);
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return message;
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}
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private static byte[] CreateSetMessage(int tuner, string name, string value, uint? lockkey)
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{
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var byteName = Encoding.UTF8.GetBytes(string.Format(CultureInfo.InvariantCulture, "/tuner{0}/{1}\0", tuner, name));
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var byteValue = Encoding.UTF8.GetBytes(string.Format(CultureInfo.InvariantCulture, "{0}\0", value));
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int messageLength = byteName.Length + byteValue.Length + 12;
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if (lockkey.HasValue)
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{
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messageLength += 6;
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}
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var message = new byte[messageLength];
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int offset = InsertHeaderAndName(byteName, messageLength, message);
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bool flipEndian = BitConverter.IsLittleEndian;
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message[offset++] = GetSetValue;
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message[offset++] = Convert.ToByte(byteValue.Length);
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Buffer.BlockCopy(byteValue, 0, message, offset, byteValue.Length);
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offset += byteValue.Length;
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if (lockkey.HasValue)
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{
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message[offset++] = GetSetLockkey;
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message[offset++] = 4;
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var lockKeyBytes = BitConverter.GetBytes(lockkey.Value);
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if (flipEndian)
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{
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Array.Reverse(lockKeyBytes);
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}
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Buffer.BlockCopy(lockKeyBytes, 0, message, offset, 4);
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offset += 4;
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}
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// calculate crc and insert at the end of the message
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var crcBytes = BitConverter.GetBytes(HdHomerunCrc.GetCrc32(message, messageLength - 4));
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if (flipEndian)
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{
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Array.Reverse(crcBytes);
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}
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Buffer.BlockCopy(crcBytes, 0, message, offset, 4);
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return message;
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}
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private static int InsertHeaderAndName(byte[] byteName, int messageLength, byte[] message)
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{
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// check to see if we need to flip endiannes
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bool flipEndian = BitConverter.IsLittleEndian;
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int offset = 0;
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// create header bytes
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var getSetBytes = BitConverter.GetBytes(GetSetRequest);
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var msgLenBytes = BitConverter.GetBytes((ushort)(messageLength - 8)); // Subtrace 4 bytes for header and 4 bytes for crc
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if (flipEndian)
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{
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Array.Reverse(getSetBytes);
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Array.Reverse(msgLenBytes);
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}
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// insert header bytes into message
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Buffer.BlockCopy(getSetBytes, 0, message, offset, 2);
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offset += 2;
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Buffer.BlockCopy(msgLenBytes, 0, message, offset, 2);
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offset += 2;
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// insert tag name and length
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message[offset++] = GetSetName;
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message[offset++] = Convert.ToByte(byteName.Length);
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// insert name string
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Buffer.BlockCopy(byteName, 0, message, offset, byteName.Length);
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offset += byteName.Length;
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return offset;
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}
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private static bool ParseReturnMessage(byte[] buf, int numBytes, out string returnVal)
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{
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returnVal = string.Empty;
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if (numBytes < 4)
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{
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return false;
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}
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var flipEndian = BitConverter.IsLittleEndian;
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int offset = 0;
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byte[] msgTypeBytes = new byte[2];
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Buffer.BlockCopy(buf, offset, msgTypeBytes, 0, msgTypeBytes.Length);
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if (flipEndian)
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{
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Array.Reverse(msgTypeBytes);
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}
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var msgType = BitConverter.ToUInt16(msgTypeBytes, 0);
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offset += 2;
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if (msgType != GetSetReply)
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{
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return false;
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}
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byte[] msgLengthBytes = new byte[2];
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Buffer.BlockCopy(buf, offset, msgLengthBytes, 0, msgLengthBytes.Length);
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if (flipEndian)
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{
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Array.Reverse(msgLengthBytes);
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}
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var msgLength = BitConverter.ToUInt16(msgLengthBytes, 0);
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offset += 2;
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if (numBytes < msgLength + 8)
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{
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return false;
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}
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offset++; // Name Tag
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var nameLength = buf[offset++];
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// skip the name field to get to value for return
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offset += nameLength;
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offset++; // Value Tag
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var valueLength = buf[offset++];
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returnVal = Encoding.UTF8.GetString(buf, offset, valueLength - 1); // remove null terminator
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return true;
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}
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private static class HdHomerunCrc
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{
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private static uint[] crc_table = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
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0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
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0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
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0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
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0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
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0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
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0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
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0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
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0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
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0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
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0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
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0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
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0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
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0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
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0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
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0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
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0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
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0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
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0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
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0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
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0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
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0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
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0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
|
|
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
|
|
0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
|
|
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
|
|
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
|
|
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
|
|
0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
|
|
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
|
|
0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
|
|
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
|
|
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
|
|
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
|
|
0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
|
|
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
|
|
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
|
|
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
|
|
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
|
|
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
|
|
0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
|
|
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
|
|
0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
|
|
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
|
|
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d };
|
|
|
|
public static uint GetCrc32(byte[] bytes, int numBytes)
|
|
{
|
|
var hash = 0xffffffff;
|
|
for (var i = 0; i < numBytes; i++)
|
|
{
|
|
hash = (hash >> 8) ^ crc_table[(hash ^ bytes[i]) & 0xff];
|
|
}
|
|
|
|
var tmp = ~hash & 0xffffffff;
|
|
var b0 = tmp & 0xff;
|
|
var b1 = (tmp >> 8) & 0xff;
|
|
var b2 = (tmp >> 16) & 0xff;
|
|
var b3 = (tmp >> 24) & 0xff;
|
|
return (b0 << 24) | (b1 << 16) | (b2 << 8) | b3;
|
|
}
|
|
}
|
|
}
|
|
}
|