update socket interfaces

Emby.Server.Implementations/Emby.Server.Implementations.csproj

@@ -169,6 +169,7 @@
     <Compile Include="LiveTv\RecordingImageProvider.cs" />
     <Compile Include="LiveTv\RefreshChannelsScheduledTask.cs" />
     <Compile Include="LiveTv\TunerHosts\BaseTunerHost.cs" />
+    <Compile Include="LiveTv\TunerHosts\HdHomerun\HdHomerunManager.cs" />
     <Compile Include="LiveTv\TunerHosts\HdHomerun\HdHomerunDiscovery.cs" />
     <Compile Include="LiveTv\TunerHosts\HdHomerun\HdHomerunHost.cs" />
     <Compile Include="LiveTv\TunerHosts\HdHomerun\HdHomerunLiveStream.cs" />

Emby.Server.Implementations/LiveTv/TunerHosts/HdHomerun/HdHomerunHost.cs

@@ -28,13 +28,15 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
         private readonly IHttpClient _httpClient;
         private readonly IFileSystem _fileSystem;
         private readonly IServerApplicationHost _appHost;
+        private readonly ISocketFactory _socketFactory;
 
-        public HdHomerunHost(IServerConfigurationManager config, ILogger logger, IJsonSerializer jsonSerializer, IMediaEncoder mediaEncoder, IHttpClient httpClient, IFileSystem fileSystem, IServerApplicationHost appHost)
+        public HdHomerunHost(IServerConfigurationManager config, ILogger logger, IJsonSerializer jsonSerializer, IMediaEncoder mediaEncoder, IHttpClient httpClient, IFileSystem fileSystem, IServerApplicationHost appHost, ISocketFactory socketFactory)
             : base(config, logger, jsonSerializer, mediaEncoder)
         {
             _httpClient = httpClient;
             _fileSystem = fileSystem;
             _appHost = appHost;
+            _socketFactory = socketFactory;
         }
 
         public string Name
@@ -104,14 +106,14 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
         }
 
         private readonly Dictionary<string, DiscoverResponse> _modelCache = new Dictionary<string, DiscoverResponse>();
-        private async Task<string> GetModelInfo(TunerHostInfo info, CancellationToken cancellationToken)
+        private async Task<DiscoverResponse> GetModelInfo(TunerHostInfo info, bool throwAllExceptions, CancellationToken cancellationToken)
         {
             lock (_modelCache)
             {
                 DiscoverResponse response;
                 if (_modelCache.TryGetValue(info.Url, out response))
                 {
-                    return response.ModelNumber;
+                    return response;
                 }
             }
 
@@ -135,67 +137,57 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
                         _modelCache[info.Id] = response;
                     }
 
-                    return response.ModelNumber;
+                    return response;
                 }
             }
             catch (HttpException ex)
             {
-                if (ex.StatusCode.HasValue && ex.StatusCode.Value == System.Net.HttpStatusCode.NotFound)
+                if (!throwAllExceptions && ex.StatusCode.HasValue && ex.StatusCode.Value == System.Net.HttpStatusCode.NotFound)
                 {
                     var defaultValue = "HDHR";
+                    var response = new DiscoverResponse
+                    {
+                        ModelNumber = defaultValue
+                    };
                     // HDHR4 doesn't have this api
                     lock (_modelCache)
                     {
-                        _modelCache[info.Id] = new DiscoverResponse
-                        {
-                            ModelNumber = defaultValue
-                        };
+                        _modelCache[info.Id] = response;
                     }
-                    return defaultValue;
+                    return response;
                 }
 
                 throw;
             }
         }
 
-        public async Task<List<LiveTvTunerInfo>> GetTunerInfos(TunerHostInfo info, CancellationToken cancellationToken)
+        private async Task<List<LiveTvTunerInfo>> GetTunerInfos(TunerHostInfo info, CancellationToken cancellationToken)
         {
-            var model = await GetModelInfo(info, cancellationToken).ConfigureAwait(false);
+            var model = await GetModelInfo(info, false, cancellationToken).ConfigureAwait(false);
 
-            using (var stream = await _httpClient.Get(new HttpRequestOptions()
-            {
-                Url = string.Format("{0}/tuners.html", GetApiUrl(info, false)),
-                CancellationToken = cancellationToken,
-                TimeoutMs = Convert.ToInt32(TimeSpan.FromSeconds(5).TotalMilliseconds),
-                BufferContent = false
+            var tuners = new List<LiveTvTunerInfo>();
 
-            }).ConfigureAwait(false))
+            using (var manager = new HdHomerunManager(_socketFactory))
             {
-                var tuners = new List<LiveTvTunerInfo>();
-                using (var sr = new StreamReader(stream, System.Text.Encoding.UTF8))
+                // Legacy HdHomeruns are IPv4 only
+                var ipInfo = new IpAddressInfo(info.Url, IpAddressFamily.InterNetwork);
+
+                for (int i = 0; i < model.TunerCount; ++i)
                 {
-                    while (!sr.EndOfStream)
+                    var name = String.Format("Tuner {0}", i + 1);
+                    var currentChannel = "none"; /// @todo Get current channel and map back to Station Id      
+                    var isAvailable = await manager.CheckTunerAvailability(ipInfo, i, cancellationToken).ConfigureAwait(false);
+                    LiveTvTunerStatus status = isAvailable ? LiveTvTunerStatus.Available : LiveTvTunerStatus.LiveTv;
+                    tuners.Add(new LiveTvTunerInfo
                     {
-                        string line = StripXML(sr.ReadLine());
-                        if (line.Contains("Channel"))
-                        {
-                            LiveTvTunerStatus status;
-                            var index = line.IndexOf("Channel", StringComparison.OrdinalIgnoreCase);
-                            var name = line.Substring(0, index - 1);
-                            var currentChannel = line.Substring(index + 7);
-                            if (currentChannel != "none") { status = LiveTvTunerStatus.LiveTv; } else { status = LiveTvTunerStatus.Available; }
-                            tuners.Add(new LiveTvTunerInfo
-                            {
-                                Name = name,
-                                SourceType = string.IsNullOrWhiteSpace(model) ? Name : model,
-                                ProgramName = currentChannel,
-                                Status = status
-                            });
-                        }
-                    }
+                        Name = name,
+                        SourceType = string.IsNullOrWhiteSpace(model.ModelNumber) ? Name : model.ModelNumber,
+                        ProgramName = currentChannel,
+                        Status = status
+                    });
                 }
-                return tuners;
             }
+            return tuners;
         }
 
         public async Task<List<LiveTvTunerInfo>> GetTunerInfos(CancellationToken cancellationToken)
@@ -244,34 +236,6 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
             return uri.AbsoluteUri.TrimEnd('/');
         }
 
-        private static string StripXML(string source)
-        {
-            char[] buffer = new char[source.Length];
-            int bufferIndex = 0;
-            bool inside = false;
-
-            for (int i = 0; i < source.Length; i++)
-            {
-                char let = source[i];
-                if (let == '<')
-                {
-                    inside = true;
-                    continue;
-                }
-                if (let == '>')
-                {
-                    inside = false;
-                    continue;
-                }
-                if (!inside)
-                {
-                    buffer[bufferIndex] = let;
-                    bufferIndex++;
-                }
-            }
-            return new string(buffer, 0, bufferIndex);
-        }
-
         private class Channels
         {
             public string GuideNumber { get; set; }
@@ -455,8 +419,8 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
 
             try
             {
-                var model = await GetModelInfo(info, cancellationToken).ConfigureAwait(false);
-                model = model ?? string.Empty;
+                var modelInfo = await GetModelInfo(info, false, cancellationToken).ConfigureAwait(false);
+                var model = modelInfo == null ? string.Empty : (modelInfo.ModelNumber ?? string.Empty);
 
                 if ((model.IndexOf("hdtc", StringComparison.OrdinalIgnoreCase) != -1))
                 {
@@ -531,18 +495,8 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
             try
             {
                 // Test it by pulling down the lineup
-                using (var stream = await _httpClient.Get(new HttpRequestOptions
-                {
-                    Url = string.Format("{0}/discover.json", GetApiUrl(info, false)),
-                    CancellationToken = CancellationToken.None,
-                    BufferContent = false
-
-                }).ConfigureAwait(false))
-                {
-                    var response = JsonSerializer.DeserializeFromStream<DiscoverResponse>(stream);
-
-                    info.DeviceId = response.DeviceID;
-                }
+                var modelInfo = await GetModelInfo(info, true, CancellationToken.None).ConfigureAwait(false);
+                info.DeviceId = modelInfo.DeviceID;
             }
             catch (HttpException ex)
             {
@@ -573,6 +527,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
             public string DeviceAuth { get; set; }
             public string BaseURL { get; set; }
             public string LineupURL { get; set; }
+            public int TunerCount { get; set; }
         }
     }
 }

Emby.Server.Implementations/LiveTv/TunerHosts/HdHomerun/HdHomerunManager.cs

@@ -0,0 +1,397 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+using MediaBrowser.Model.Net;
+
+namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
+{
+    public class HdHomerunManager : IDisposable
+    {
+        public static int HdHomeRunPort = 65001;
+        // Message constants
+        private static byte GetSetName = 3;
+        private static byte GetSetValue = 4;
+        private static byte GetSetLockkey = 21;
+        private static ushort GetSetRequest = 4;
+        private static ushort GetSetReply = 5;
+
+        private uint? _lockkey = null;
+        private int _activeTuner = 0;
+        private readonly ISocketFactory _socketFactory;
+        private IpAddressInfo _remoteIp;
+
+        public HdHomerunManager(ISocketFactory socketFactory)
+        {
+            _socketFactory = socketFactory;
+        }
+
+        public void Dispose()
+        {
+            var task = StopStreaming();
+
+            Task.WaitAll(task);
+        }
+
+        public async Task<bool> CheckTunerAvailability(IpAddressInfo remoteIp, int tuner, CancellationToken cancellationToken)
+        {
+            var ipEndPoint = new IpEndPointInfo(remoteIp, HdHomeRunPort);
+            var tcpClient = _socketFactory.CreateTcpSocket(remoteIp, HdHomeRunPort);
+            var lockkeyMsg = CreateGetMessage(tuner, "lockkey");
+            await tcpClient.SendAsync(lockkeyMsg, lockkeyMsg.Length, ipEndPoint, cancellationToken);
+            var response = await tcpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false);
+            string returnVal;
+            ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal);
+
+            return (returnVal == "none");
+        }
+
+        public async Task StartStreaming(IpAddressInfo remoteIp, IpAddressInfo localIp, int localPort, string url, int numTuners, CancellationToken cancellationToken)
+        {
+            _remoteIp = remoteIp;
+            // parse url for channel and program
+            string frequency, program;
+            if (!ParseUrl(url, out frequency, out program))
+            {
+                return;
+            }
+
+            var tcpClient = _socketFactory.CreateTcpSocket(_remoteIp, HdHomeRunPort);
+
+            if (!_lockkey.HasValue)
+            {
+                var rand = new Random();
+                _lockkey = (uint)rand.Next();
+            }
+
+            var ipEndPoint = new IpEndPointInfo(_remoteIp, HdHomeRunPort);
+
+            for (int i = 0; i < numTuners; ++i)
+            {
+                if (!await CheckTunerAvailability(_remoteIp, i, cancellationToken).ConfigureAwait(false))
+                    continue;
+
+                _activeTuner = i;
+                var lockKeyString = String.Format("{0:d}", _lockkey.Value);
+                var lockkeyMsg = CreateSetMessage(i, "lockkey", lockKeyString, null);
+                await tcpClient.SendAsync(lockkeyMsg, lockkeyMsg.Length, ipEndPoint, cancellationToken).ConfigureAwait(false);
+                var response = await tcpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false);
+                string returnVal;
+                // parse response to make sure it worked
+                if (!ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal))
+                    continue;
+
+                var channelMsg = CreateSetMessage(i, "channel", frequency, _lockkey.Value);
+                await tcpClient.SendAsync(channelMsg, channelMsg.Length, ipEndPoint, cancellationToken).ConfigureAwait(false);
+                await tcpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false);
+                // parse response to make sure it worked
+                if (!ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal))
+                {
+                    await ReleaseLockkey(tcpClient).ConfigureAwait(false);
+                    continue;
+                }
+
+                if (program != String.Empty)
+                {
+                    var programMsg = CreateSetMessage(i, "program", program, _lockkey.Value);
+                    await tcpClient.SendAsync(programMsg, programMsg.Length, ipEndPoint, cancellationToken).ConfigureAwait(false);
+                    await tcpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false);
+                    // parse response to make sure it worked
+                    if (!ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal))
+                    {
+                        await ReleaseLockkey(tcpClient).ConfigureAwait(false);
+                        continue;
+                    }
+                }
+
+                var targetValue = String.Format("rtp://{0}:{1}", localIp, localPort);
+                var targetMsg = CreateSetMessage(i, "target", targetValue, _lockkey.Value);
+
+                await tcpClient.SendAsync(targetMsg, targetMsg.Length, ipEndPoint, cancellationToken).ConfigureAwait(false);
+                response = await tcpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false);
+                // parse response to make sure it worked
+                if (!ParseReturnMessage(response.Buffer, response.ReceivedBytes, out returnVal))
+                {
+                    await ReleaseLockkey(tcpClient).ConfigureAwait(false);
+                    continue;
+                }
+
+                break;
+            }
+        }
+
+        public async Task StopStreaming()
+        {
+            if (!_lockkey.HasValue)
+                return;
+
+            using (var socket = _socketFactory.CreateTcpSocket(_remoteIp, HdHomeRunPort))
+            {
+                await ReleaseLockkey(socket).ConfigureAwait(false);
+            }
+        }
+
+        private async Task ReleaseLockkey(ISocket tcpClient)
+        {
+            var releaseTarget = CreateSetMessage(_activeTuner, "target", "none", _lockkey);
+            await tcpClient.SendAsync(releaseTarget, releaseTarget.Length, new IpEndPointInfo(_remoteIp, HdHomeRunPort), CancellationToken.None).ConfigureAwait(false);
+            await tcpClient.ReceiveAsync(CancellationToken.None).ConfigureAwait(false);
+            var releaseKeyMsg = CreateSetMessage(_activeTuner, "lockkey", "none", _lockkey);
+            _lockkey = null;
+            await tcpClient.SendAsync(releaseKeyMsg, releaseKeyMsg.Length, new IpEndPointInfo(_remoteIp, HdHomeRunPort), CancellationToken.None).ConfigureAwait(false);
+            await tcpClient.ReceiveAsync(CancellationToken.None).ConfigureAwait(false);
+        }
+
+        private static bool ParseUrl(string url, out string frequency, out string program)
+        {
+            frequency = String.Empty;
+            program = String.Empty;
+            var regExp = new Regex(@"\/ch(\d+)-?(\d*)");
+            var match = regExp.Match(url);
+            if (match.Success)
+            {
+                frequency = match.Groups[1].Value;
+                program = match.Groups[2].Value;
+                return true;
+            }
+
+            return false;
+        }
+
+        private static byte[] CreateGetMessage(int tuner, string name)
+        {
+            var byteName = Encoding.UTF8.GetBytes(String.Format("/tuner{0}/{1}\0", tuner, name));
+            int messageLength = byteName.Length + 10; // 4 bytes for header + 4 bytes for crc + 2 bytes for tag name and length
+
+            var message = new byte[messageLength];
+
+            int offset = InsertHeaderAndName(byteName, messageLength, message);
+
+            bool flipEndian = BitConverter.IsLittleEndian;
+
+            // calculate crc and insert at the end of the message
+            var crcBytes = BitConverter.GetBytes(HdHomerunCrc.GetCrc32(message, messageLength - 4));
+            if (flipEndian)
+                Array.Reverse(crcBytes);
+            Buffer.BlockCopy(crcBytes, 0, message, offset, 4);
+
+            return message;
+        }
+
+        private static byte[] CreateSetMessage(int tuner, String name, String value, uint? lockkey)
+        {
+            var byteName = Encoding.UTF8.GetBytes(String.Format("/tuner{0}/{1}\0", tuner, name));
+            var byteValue = Encoding.UTF8.GetBytes(String.Format("{0}\0", value));
+
+            int messageLength = byteName.Length + byteValue.Length + 12;
+            if (lockkey.HasValue)
+                messageLength += 6;
+
+            var message = new byte[messageLength];
+
+            int offset = InsertHeaderAndName(byteName, messageLength, message);
+
+            bool flipEndian = BitConverter.IsLittleEndian;
+
+            message[offset] = GetSetValue;
+            offset++;
+            message[offset] = Convert.ToByte(byteValue.Length);
+            offset++;
+            Buffer.BlockCopy(byteValue, 0, message, offset, byteValue.Length);
+            offset += byteValue.Length;
+            if (lockkey.HasValue)
+            {
+                message[offset] = GetSetLockkey;
+                offset++;
+                message[offset] = (byte)4;
+                offset++;
+                var lockKeyBytes = BitConverter.GetBytes(lockkey.Value);
+                if (flipEndian)
+                    Array.Reverse(lockKeyBytes);
+                Buffer.BlockCopy(lockKeyBytes, 0, message, offset, 4);
+                offset += 4;
+            }
+
+            // calculate crc and insert at the end of the message
+            var crcBytes = BitConverter.GetBytes(HdHomerunCrc.GetCrc32(message, messageLength - 4));
+            if (flipEndian)
+                Array.Reverse(crcBytes);
+            Buffer.BlockCopy(crcBytes, 0, message, offset, 4);
+
+            return message;
+        }
+
+        private static int InsertHeaderAndName(byte[] byteName, int messageLength, byte[] message)
+        {
+            // check to see if we need to flip endiannes
+            bool flipEndian = BitConverter.IsLittleEndian;
+            int offset = 0;
+
+            // create header bytes
+            var getSetBytes = BitConverter.GetBytes(GetSetRequest);
+            var msgLenBytes = BitConverter.GetBytes((ushort)(messageLength - 8)); // Subtrace 4 bytes for header and 4 bytes for crc
+
+            if (flipEndian)
+            {
+                Array.Reverse(getSetBytes);
+                Array.Reverse(msgLenBytes);
+            }
+
+            // insert header bytes into message
+            Buffer.BlockCopy(getSetBytes, 0, message, offset, 2);
+            offset += 2;
+            Buffer.BlockCopy(msgLenBytes, 0, message, offset, 2);
+            offset += 2;
+
+            // insert tag name and length
+            message[offset] = GetSetName;
+            offset++;
+            message[offset] = Convert.ToByte(byteName.Length);
+            offset++;
+
+            // insert name string
+            Buffer.BlockCopy(byteName, 0, message, offset, byteName.Length);
+            offset += byteName.Length;
+
+            return offset;
+        }
+
+        private static bool ParseReturnMessage(byte[] buf, int numBytes, out string returnVal)
+        {
+            returnVal = String.Empty;
+
+            if (numBytes < 4)
+                return false;
+
+            var flipEndian = BitConverter.IsLittleEndian;
+            int offset = 0;
+            byte[] msgTypeBytes = new byte[2];
+            Buffer.BlockCopy(buf, offset, msgTypeBytes, 0, msgTypeBytes.Length);
+
+            if (flipEndian)
+                Array.Reverse(msgTypeBytes);
+
+            var msgType = BitConverter.ToUInt16(msgTypeBytes, 0);
+            offset += 2;
+
+            if (msgType != GetSetReply)
+                return false;
+
+            byte[] msgLengthBytes = new byte[2];
+            Buffer.BlockCopy(buf, offset, msgLengthBytes, 0, msgLengthBytes.Length);
+            if (flipEndian)
+                Array.Reverse(msgLengthBytes);
+
+            var msgLength = BitConverter.ToUInt16(msgLengthBytes, 0);
+            offset += 2;
+
+            if (numBytes < msgLength + 8)
+                return false;
+
+            var nameTag = buf[offset];
+            offset++;
+
+            var nameLength = buf[offset];
+            offset++;
+
+            // skip the name field to get to value for return
+            offset += nameLength;
+
+            var valueTag = buf[offset];
+            offset++;
+
+            var valueLength = buf[offset];
+            offset++;
+
+            returnVal = Encoding.UTF8.GetString(buf, offset, valueLength - 1); // remove null terminator
+            return true;
+        }
+
+        private class HdHomerunCrc
+        {
+            private static UInt32[] crc_table = {
+            0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
+            0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+            0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+            0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+            0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
+            0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+            0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
+            0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+            0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+            0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+            0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
+            0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+            0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
+            0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+            0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+            0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+            0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
+            0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+            0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
+            0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+            0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+            0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+            0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
+            0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+            0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
+            0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+            0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+            0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+            0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
+            0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+            0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
+            0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+            0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+            0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
+            0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
+            0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+            0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
+            0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+            0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+            0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+            0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
+            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 UInt32 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;
+                hash = (b0 << 24) | (b1 << 16) | (b2 << 8) | b3;
+                return hash;
+            }
+        }
+    }
+}

Emby.Server.Implementations/Udp/UdpServer.cs

@@ -128,7 +128,7 @@ namespace Emby.Server.Implementations.Udp
         /// <summary>
         /// The _udp client
         /// </summary>
-        private IUdpSocket _udpClient;
+        private ISocket _udpClient;
         private readonly ISocketFactory _socketFactory;
 
         /// <summary>
@@ -148,7 +148,7 @@ namespace Emby.Server.Implementations.Udp
             {
                 try
                 {
-                    var result = await _udpClient.ReceiveAsync().ConfigureAwait(false);
+                    var result = await _udpClient.ReceiveAsync(CancellationToken.None).ConfigureAwait(false);
 
                     OnMessageReceived(result);
                 }