Added Opus.Net, fixed public IP method, starting to add outgoing voice support.

src/Discord.Net.Net45/Discord.Net.csproj

@@ -141,6 +141,12 @@
     </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Opus.Net.Net45\Opus.Net.csproj">
+      <Project>{114c8c10-7354-4ec3-819a-33e83aa57768}</Project>
+      <Name>Opus.Net</Name>
+    </ProjectReference>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="..\..\packages\Baseclass.Contrib.Nuget.Output.1.0.0\build\net40\Baseclass.Contrib.Nuget.Output.targets" Condition="Exists('..\..\packages\Baseclass.Contrib.Nuget.Output.1.0.0\build\net40\Baseclass.Contrib.Nuget.Output.targets')" />
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">

src/Discord.Net/DiscordClient.cs

@@ -1320,6 +1320,13 @@ namespace Discord
 			return DiscordAPI.Undeafen(serverId, userId);
 		}
 
+#if !DNXCORE50
+		public void SendVoiceWAV(byte[] buffer, int count)
+		{
+			_voiceWebSocket.SendWAV(buffer, count);
+		}
+#endif
+
 		//Profile
 		/// <summary> Changes your username to newName. </summary>
 		public async Task ChangeUsername(string newName, string currentEmail, string currentPassword)
@@ -1360,7 +1367,7 @@ namespace Discord
 		private string GenerateNonce()
 		{
 			lock (_rand)
-				return _rand.Next(0, int.MaxValue).ToString();
+				return _rand.Next().ToString();
 		}
 
 		/// <summary> Blocking call that will not return until client has been stopped. This is mainly intended for use in console applications. </summary>

src/Discord.Net/DiscordVoiceSocket.cs

@@ -10,6 +10,10 @@ using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
 using WebSocketMessage = Discord.API.Models.VoiceWebSocketCommands.WebSocketMessage;
+using System.Text;
+#if !DNXCORE50
+using Opus.Net;
+#endif
 
 namespace Discord
 {
@@ -23,13 +27,24 @@ namespace Discord
 		private byte[] _secretKey;
 		private string _mode;
 		private bool _isFirst;
+		private ushort _sequence;
+		private uint _ssrc;
+		private long _startTicks;
+		private readonly Random _rand = new Random();
+
+#if !DNXCORE50
+		private OpusEncoder _encoder;
+#endif
 
 		public DiscordVoiceSocket(int timeout, int interval)
 			: base(timeout, interval)
 		{
 			_connectWaitOnLogin = new ManualResetEventSlim(false);
 			_sendQueue = new ConcurrentQueue<byte[]>();
-        }
+#if !DNXCORE50
+			_encoder = OpusEncoder.Create(24000, 1, Application.Voip);
+#endif
+		}
 
 		protected override void OnConnect()
 		{
@@ -58,7 +73,7 @@ namespace Discord
 
 			_connectWaitOnLogin.Reset();
 
-			_myIp = (await Http.Get("http://ipinfo.io/ip")).Trim();
+			_sequence = 0;
 
 			VoiceWebSocketCommands.Login msg = new VoiceWebSocketCommands.Login();
 			msg.Payload.ServerId = serverId;
@@ -138,13 +153,18 @@ namespace Discord
 						//_mode = payload.Modes.LastOrDefault();
 						_mode = "plain";
                         _udp.Connect(_endpoint);
-						var ssrc = payload.SSRC;
+						lock(_rand)
+						{
+							_sequence = (ushort)_rand.Next(0, ushort.MaxValue);
+							_startTicks = DateTime.UtcNow.Ticks - _rand.Next();
+						}
+						_ssrc = payload.SSRC;
 
 						_sendQueue.Enqueue(new byte[70] {
-							(byte)((ssrc >> 24) & 0xFF),
-							(byte)((ssrc >> 16) & 0xFF),
-							(byte)((ssrc >> 8) & 0xFF),
-							(byte)((ssrc >> 0) & 0xFF),
+							(byte)((_ssrc >> 24) & 0xFF),
+							(byte)((_ssrc >> 16) & 0xFF),
+							(byte)((_ssrc >> 8) & 0xFF),
+							(byte)((_ssrc >> 0) & 0xFF),
 							0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 							0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 							0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
@@ -179,6 +199,8 @@ namespace Discord
 
 					int port = buffer[68] | buffer[69] << 8;
 
+					_myIp = Encoding.ASCII.GetString(buffer, 4, 70 - 6).TrimEnd('\0');
+
 					var login2 = new VoiceWebSocketCommands.Login2();
 					login2.Payload.Protocol = "udp";
 					login2.Payload.SocketData.Address = _myIp;
@@ -189,7 +211,7 @@ namespace Discord
 				else
 				{
 					//Parse RTP Data
-					if (length < 12)
+					/*if (length < 12)
 						throw new Exception($"Unexpected message length. Expected >= 12, got {length}.");
 
 					byte flags = buffer[0];
@@ -227,11 +249,38 @@ namespace Discord
 						byte[] newBuffer = new byte[buffer.Length - 12];
 						Buffer.BlockCopy(buffer, 12, newBuffer, 0, newBuffer.Length);
 						buffer = newBuffer;
-					}
+					}*/
+
+					//TODO: Use Voice Data
 				}
 			}
         }
 
+#if !DNXCORE50
+		public void SendWAV(byte[] buffer, int count)
+		{
+			int encodedLength;
+			buffer = _encoder.Encode(buffer, count, out encodedLength);
+			byte[] packet = new byte[12 + encodedLength];
+			Buffer.BlockCopy(buffer, 0, packet, 12, encodedLength);
+
+			ushort sequence = _sequence++;
+			long timestamp = (DateTime.UtcNow.Ticks - _startTicks) >> 2; //200ns resolution
+            packet[0] = 0x80; //Flags;
+			packet[1] = 0x78; //Payload Type
+			packet[2] = (byte)((sequence >> 8) & 0xFF);
+			packet[3] = (byte)((sequence >> 0) & 0xFF);
+			packet[4] = (byte)((timestamp >> 24) & 0xFF);
+			packet[5] = (byte)((timestamp >> 16) & 0xFF);
+			packet[6] = (byte)((timestamp >> 8) & 0xFF);
+			packet[7] = (byte)((timestamp >> 0) & 0xFF);
+			packet[8] = (byte)((_ssrc >> 24) & 0xFF);
+			packet[9] = (byte)((_ssrc >> 16) & 0xFF);
+			packet[10] = (byte)((_ssrc >> 8) & 0xFF);
+			packet[11] = (byte)((_ssrc >> 0) & 0xFF);
+		}
+#endif
+
 		protected override object GetKeepAlive()
 		{
 			return new VoiceWebSocketCommands.KeepAlive();

src/Discord.Net/project.json

@@ -1,54 +1,56 @@
 {
-    "version": "0.5.0-*",
-    "description": "An unofficial .Net API wrapper for the Discord client.",
-    "authors": [ "RogueException" ],
-    "tags": [ "discord", "discordapp" ],
-    "projectUrl": "https://github.com/RogueException/Discord.Net",
-    "licenseUrl": "http://opensource.org/licenses/MIT",
-    "repository": {
-        "type": "git",
-        "url": "git://github.com/RogueException/Discord.Net"
-    },
-    "configurations": {
-        "FullDebug": {
-            "compilationOptions": {
-                "define": [ "DEBUG", "TRACE", "TEST_RESPONSES" ]
-            }
-        }
-    },
+	"version": "0.5.0-*",
+	"description": "An unofficial .Net API wrapper for the Discord client.",
+	"authors": [ "RogueException" ],
+	"tags": [ "discord", "discordapp" ],
+	"projectUrl": "https://github.com/RogueException/Discord.Net",
+	"licenseUrl": "http://opensource.org/licenses/MIT",
+	"repository": {
+		"type": "git",
+		"url": "git://github.com/RogueException/Discord.Net"
+	},
+	"configurations": {
+		"FullDebug": {
+			"compilationOptions": {
+				"define": [ "DEBUG", "TRACE", "TEST_RESPONSES" ]
+			}
+		}
+	},
 
-    "dependencies": {
-        "Newtonsoft.Json": "7.0.1"
-    },
+	"dependencies": {
+		"Newtonsoft.Json": "7.0.1"
+	},
 
-    "frameworks": {
-        "net45": {
-            "dependencies": {
-                "Microsoft.Net.Http": "2.2.22",
-                "libsodium-net": "0.8.0",
-                "Baseclass.Contrib.Nuget.Output": "2.1.0"
-            }
-        },
-        "dnx451": {
-            "dependencies": {
-                "Microsoft.Net.Http": "2.2.22",
-                "libsodium-net": "0.8.0",
-                "Baseclass.Contrib.Nuget.Output": "2.1.0"
-            }
-        },
-        "dnxcore50": {
-            "dependencies": {
-                "System.Collections.Concurrent": "4.0.10",
-                "System.Diagnostics.Debug": "4.0.10",
-                "System.IO.Compression": "4.0.0",
-                "System.Linq": "4.0.0",
-                "System.Net.Requests": "4.0.10",
-                "System.Net.Sockets": "4.0.10-beta-23019",
-                "System.Net.WebSockets.Client": "4.0.0-beta-23123",
-                "System.Runtime": "4.0.20",
-                "System.Text.RegularExpressions": "4.0.10",
-                "System.Net.NameResolution": "4.0.0-beta-23019"
-            }
-        }
-    }
+	"frameworks": {
+		"net45": {
+			"dependencies": {
+				"Microsoft.Net.Http": "2.2.22",
+				"libsodium-net": "0.8.0",
+				"Baseclass.Contrib.Nuget.Output": "2.1.0",
+				"Opus.Net": "0.1.0"
+			}
+		},
+		"dnx451": {
+			"dependencies": {
+				"Microsoft.Net.Http": "2.2.22",
+				"libsodium-net": "0.8.0",
+				"Baseclass.Contrib.Nuget.Output": "2.1.0",
+				"Opus.Net": "0.1.0"
+			}
+		},
+		"dnxcore50": {
+			"dependencies": {
+				"System.Collections.Concurrent": "4.0.10",
+				"System.Diagnostics.Debug": "4.0.10",
+				"System.IO.Compression": "4.0.0",
+				"System.Linq": "4.0.0",
+				"System.Net.Requests": "4.0.10",
+				"System.Net.Sockets": "4.0.10-beta-23019",
+				"System.Net.WebSockets.Client": "4.0.0-beta-23123",
+				"System.Runtime": "4.0.20",
+				"System.Text.RegularExpressions": "4.0.10",
+				"System.Net.NameResolution": "4.0.0-beta-23019"
+			}
+		}
+	}
 }

src/Opus.Net.Net45/Opus.Net.csproj

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{114C8C10-7354-4EC3-819A-33E83AA57768}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Discord.Net</RootNamespace>
+    <AssemblyName>Discord.Net</AssemblyName>
+    <FileAlignment>512</FileAlignment>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <NuGetPackageImportStamp>
+    </NuGetPackageImportStamp>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>2</WarningLevel>
+    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Newtonsoft.Json, Version=7.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Sodium, Version=0.8.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\libsodium-net.0.8.0\lib\Net40\Sodium.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Net.Http" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="..\Opus.Net\API.cs">
+      <Link>API.cs</Link>
+    </Compile>
+    <Compile Include="..\Opus.Net\OpusDecoder.cs">
+      <Link>OpusDecoder.cs</Link>
+    </Compile>
+    <Compile Include="..\Opus.Net\OpusEncoder.cs">
+      <Link>OpusEncoder.cs</Link>
+    </Compile>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Import Project="..\..\packages\Baseclass.Contrib.Nuget.Output.1.0.0\build\net40\Baseclass.Contrib.Nuget.Output.targets" Condition="Exists('..\..\packages\Baseclass.Contrib.Nuget.Output.1.0.0\build\net40\Baseclass.Contrib.Nuget.Output.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\packages\Baseclass.Contrib.Nuget.Output.1.0.0\build\net40\Baseclass.Contrib.Nuget.Output.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Baseclass.Contrib.Nuget.Output.1.0.0\build\net40\Baseclass.Contrib.Nuget.Output.targets'))" />
+  </Target>
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

src/Opus.Net.Net45/Properties/AssemblyInfo.cs

@@ -0,0 +1,17 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+[assembly: AssemblyTitle("Opus.Net")]
+[assembly: AssemblyDescription("Opus .NET Wrapper")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("John Carruthers")]
+[assembly: AssemblyProduct("Opus.Net")]
+[assembly: AssemblyCopyright("Copyright © 2013")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+[assembly: ComVisible(false)]
+[assembly: Guid("76ea00e6-ea24-41e1-acb2-639c0313fa80")]
+
+[assembly: AssemblyVersion("0.1.0.0")]
+[assembly: AssemblyFileVersion("0.1.0.0")]

src/Opus.Net.Net45/packages.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Baseclass.Contrib.Nuget.Output" version="1.0.0" targetFramework="net45" />
+  <package id="libsodium-net" version="0.8.0" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
+</packages>

src/Opus.Net/API.cs

@@ -0,0 +1,108 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+
+namespace Opus.Net
+{
+	internal class API
+	{
+		static API()
+		{
+			if (LoadLibrary(Environment.Is64BitProcess ? "lib/x64/opus.dll" : "lib/x86/opus.dll") == IntPtr.Zero)
+				throw new FileNotFoundException("Unable to find opus.dll", "opus.dll");
+		}
+
+		[DllImport("kernel32.dll")]
+		private static extern IntPtr LoadLibrary(string dllToLoad);
+
+		[DllImport("opus.dll", CallingConvention = CallingConvention.Cdecl)]
+		internal static extern IntPtr opus_encoder_create(int Fs, int channels, int application, out IntPtr error);
+
+		[DllImport("opus.dll", CallingConvention = CallingConvention.Cdecl)]
+		internal static extern void opus_encoder_destroy(IntPtr encoder);
+
+		[DllImport("opus.dll", CallingConvention = CallingConvention.Cdecl)]
+		internal static extern int opus_encode(IntPtr st, byte[] pcm, int frame_size, IntPtr data, int max_data_bytes);
+
+		[DllImport("opus.dll", CallingConvention = CallingConvention.Cdecl)]
+		internal static extern IntPtr opus_decoder_create(int Fs, int channels, out IntPtr error);
+
+		[DllImport("opus.dll", CallingConvention = CallingConvention.Cdecl)]
+		internal static extern void opus_decoder_destroy(IntPtr decoder);
+
+		[DllImport("opus.dll", CallingConvention = CallingConvention.Cdecl)]
+		internal static extern int opus_decode(IntPtr st, byte[] data, int len, IntPtr pcm, int frame_size, int decode_fec);
+
+		[DllImport("opus.dll", CallingConvention = CallingConvention.Cdecl)]
+		internal static extern int opus_encoder_ctl(IntPtr st, Ctl request, int value);
+
+		[DllImport("opus.dll", CallingConvention = CallingConvention.Cdecl)]
+		internal static extern int opus_encoder_ctl(IntPtr st, Ctl request, out int value);
+	}
+
+	public enum Ctl : int
+	{
+		SetBitrateRequest = 4002,
+		GetBitrateRequest = 4003,
+		SetInbandFECRequest = 4012,
+		GetInbandFECRequest = 4013
+	}
+
+	/// <summary>
+	/// Supported coding modes.
+	/// </summary>
+	public enum Application
+	{
+		/// <summary>
+		/// Best for most VoIP/videoconference applications where listening quality and intelligibility matter most.
+		/// </summary>
+		Voip = 2048,
+		/// <summary>
+		/// Best for broadcast/high-fidelity application where the decoded audio should be as close as possible to input.
+		/// </summary>
+		Audio = 2049,
+		/// <summary>
+		/// Only use when lowest-achievable latency is what matters most. Voice-optimized modes cannot be used.
+		/// </summary>
+		Restricted_LowLatency = 2051
+	}
+
+	public enum Errors
+	{
+		/// <summary>
+		/// No error.
+		/// </summary>
+		OK = 0,
+		/// <summary>
+		/// One or more invalid/out of range arguments.
+		/// </summary>
+		BadArg = -1,
+		/// <summary>
+		/// The mode struct passed is invalid.
+		/// </summary>
+		BufferToSmall = -2,
+		/// <summary>
+		/// An internal error was detected.
+		/// </summary>
+		InternalError = -3,
+		/// <summary>
+		/// The compressed data passed is corrupted.
+		/// </summary>
+		InvalidPacket = -4,
+		/// <summary>
+		/// Invalid/unsupported request number.
+		/// </summary>
+		Unimplemented = -5,
+		/// <summary>
+		/// An encoder or decoder structure is invalid or already freed.
+		/// </summary>
+		InvalidState = -6,
+		/// <summary>
+		/// Memory allocation has failed.
+		/// </summary>
+		AllocFail = -7
+	}
+}

src/Opus.Net/Opus.Net.xproj

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+  </PropertyGroup>
+
+  <Import Project="$(VSToolsPath)\DNX\Microsoft.DNX.Props" Condition="'$(VSToolsPath)' != ''" />
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>42ab6a2d-2f2c-4003-80ef-33b5b5b0ed8e</ProjectGuid>
+    <RootNamespace>Opus.Net</RootNamespace>
+    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">..\artifacts\obj\$(MSBuildProjectName)</BaseIntermediateOutputPath>
+    <OutputPath Condition="'$(OutputPath)'=='' ">..\artifacts\bin\$(MSBuildProjectName)\</OutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DNX\Microsoft.DNX.targets" Condition="'$(VSToolsPath)' != ''" />
+</Project>

src/Opus.Net/OpusDecoder.cs

@@ -0,0 +1,133 @@
+using System;
+
+namespace Opus.Net
+{
+	/// <summary>
+	/// Opus audio decoder.
+	/// </summary>
+	public class OpusDecoder : IDisposable
+	{
+		/// <summary>
+		/// Creates a new Opus decoder.
+		/// </summary>
+		/// <param name="outputSampleRate">Sample rate to decode at (Hz). This must be one of 8000, 12000, 16000, 24000, or 48000.</param>
+		/// <param name="outputChannels">Number of channels to decode.</param>
+		/// <returns>A new <c>OpusDecoder</c>.</returns>
+		public static OpusDecoder Create(int outputSampleRate, int outputChannels)
+		{
+			if (outputSampleRate != 8000 &&
+				outputSampleRate != 12000 &&
+				outputSampleRate != 16000 &&
+				outputSampleRate != 24000 &&
+				outputSampleRate != 48000)
+				throw new ArgumentOutOfRangeException("inputSamplingRate");
+			if (outputChannels != 1 && outputChannels != 2)
+				throw new ArgumentOutOfRangeException("inputChannels");
+
+			IntPtr error;
+			IntPtr decoder = API.opus_decoder_create(outputSampleRate, outputChannels, out error);
+			if ((Errors)error != Errors.OK)
+			{
+				throw new Exception("Exception occured while creating decoder");
+			}
+			return new OpusDecoder(decoder, outputSampleRate, outputChannels);
+		}
+
+		private IntPtr _decoder;
+
+		private OpusDecoder(IntPtr decoder, int outputSamplingRate, int outputChannels)
+		{
+			_decoder = decoder;
+			OutputSamplingRate = outputSamplingRate;
+			OutputChannels = outputChannels;
+			MaxDataBytes = 4000;
+		}
+
+		/// <summary>
+		/// Produces PCM samples from Opus encoded data.
+		/// </summary>
+		/// <param name="inputOpusData">Opus encoded data to decode, null for dropped packet.</param>
+		/// <param name="dataLength">Length of data to decode.</param>
+		/// <param name="decodedLength">Set to the length of the decoded sample data.</param>
+		/// <returns>PCM audio samples.</returns>
+		public unsafe byte[] Decode(byte[] inputOpusData, int dataLength, out int decodedLength)
+		{
+			if (disposed)
+				throw new ObjectDisposedException("OpusDecoder");
+
+			IntPtr decodedPtr;
+			byte[] decoded = new byte[MaxDataBytes];
+			int frameCount = FrameCount(MaxDataBytes);
+			int length = 0;
+			fixed (byte* bdec = decoded)
+			{
+				decodedPtr = new IntPtr((void*)bdec);
+
+				if (inputOpusData != null)
+					length = API.opus_decode(_decoder, inputOpusData, dataLength, decodedPtr, frameCount, 0);
+				else
+					length = API.opus_decode(_decoder, null, 0, decodedPtr, frameCount, (ForwardErrorCorrection) ? 1 : 0);
+			}
+			decodedLength = length * 2;
+			if (length < 0)
+				throw new Exception("Decoding failed - " + ((Errors)length).ToString());
+
+			return decoded;
+		}
+
+		/// <summary>
+		/// Determines the number of frames that can fit into a buffer of the given size.
+		/// </summary>
+		/// <param name="bufferSize"></param>
+		/// <returns></returns>
+		public int FrameCount(int bufferSize)
+		{
+			//  seems like bitrate should be required
+			int bitrate = 16;
+			int bytesPerSample = (bitrate / 8) * OutputChannels;
+			return bufferSize / bytesPerSample;
+		}
+
+		/// <summary>
+		/// Gets the output sampling rate of the decoder.
+		/// </summary>
+		public int OutputSamplingRate { get; private set; }
+
+		/// <summary>
+		/// Gets the number of channels of the decoder.
+		/// </summary>
+		public int OutputChannels { get; private set; }
+
+		/// <summary>
+		/// Gets or sets the size of memory allocated for decoding data.
+		/// </summary>
+		public int MaxDataBytes { get; set; }
+
+		/// <summary>
+		/// Gets or sets whether forward error correction is enabled or not.
+		/// </summary>
+		public bool ForwardErrorCorrection { get; set; }
+
+		~OpusDecoder()
+		{
+			Dispose();
+		}
+
+		private bool disposed;
+		public void Dispose()
+		{
+			if (disposed)
+				return;
+
+			GC.SuppressFinalize(this);
+
+			if (_decoder != IntPtr.Zero)
+			{
+				API.opus_decoder_destroy(_decoder);
+				_decoder = IntPtr.Zero;
+			}
+
+			disposed = true;
+		}
+	}
+}

src/Opus.Net/OpusEncoder.cs

@@ -0,0 +1,198 @@
+using System;
+
+namespace Opus.Net
+{
+	/// <summary>
+	/// Opus codec wrapper.
+	/// </summary>
+	public class OpusEncoder : IDisposable
+	{
+		/// <summary>
+		/// Creates a new Opus encoder.
+		/// </summary>
+		/// <param name="inputSamplingRate">Sampling rate of the input signal (Hz). This must be one of 8000, 12000, 16000, 24000, or 48000.</param>
+		/// <param name="inputChannels">Number of channels (1 or 2) in input signal.</param>
+		/// <param name="application">Coding mode.</param>
+		/// <returns>A new <c>OpusEncoder</c></returns>
+		public static OpusEncoder Create(int inputSamplingRate, int inputChannels, Application application)
+		{
+			if (inputSamplingRate != 8000 &&
+				inputSamplingRate != 12000 &&
+				inputSamplingRate != 16000 &&
+				inputSamplingRate != 24000 &&
+				inputSamplingRate != 48000)
+				throw new ArgumentOutOfRangeException("inputSamplingRate");
+			if (inputChannels != 1 && inputChannels != 2)
+				throw new ArgumentOutOfRangeException("inputChannels");
+
+			IntPtr error;
+			IntPtr encoder = API.opus_encoder_create(inputSamplingRate, inputChannels, (int)application, out error);
+			if ((Errors)error != Errors.OK)
+			{
+				throw new Exception("Exception occured while creating encoder");
+			}
+			return new OpusEncoder(encoder, inputSamplingRate, inputChannels, application);
+		}
+
+		private IntPtr _encoder;
+
+		private OpusEncoder(IntPtr encoder, int inputSamplingRate, int inputChannels, Application application)
+		{
+			_encoder = encoder;
+			InputSamplingRate = inputSamplingRate;
+			InputChannels = inputChannels;
+			Application = application;
+			MaxDataBytes = 4000;
+		}
+
+		/// <summary>
+		/// Produces Opus encoded audio from PCM samples.
+		/// </summary>
+		/// <param name="inputPcmSamples">PCM samples to encode.</param>
+		/// <param name="sampleLength">How many bytes to encode.</param>
+		/// <param name="encodedLength">Set to length of encoded audio.</param>
+		/// <returns>Opus encoded audio buffer.</returns>
+		public unsafe byte[] Encode(byte[] inputPcmSamples, int sampleLength, out int encodedLength)
+		{
+			if (disposed)
+				throw new ObjectDisposedException("OpusEncoder");
+
+			int frames = FrameCount(inputPcmSamples);
+			IntPtr encodedPtr;
+			byte[] encoded = new byte[MaxDataBytes];
+			int length = 0;
+			fixed (byte* benc = encoded)
+			{
+				encodedPtr = new IntPtr((void*)benc);
+				length = API.opus_encode(_encoder, inputPcmSamples, frames, encodedPtr, sampleLength);
+			}
+			encodedLength = length;
+			if (length < 0)
+				throw new Exception("Encoding failed - " + ((Errors)length).ToString());
+
+			return encoded;
+		}
+
+		/// <summary>
+		/// Determines the number of frames in the PCM samples.
+		/// </summary>
+		/// <param name="pcmSamples"></param>
+		/// <returns></returns>
+		public int FrameCount(byte[] pcmSamples)
+		{
+			//  seems like bitrate should be required
+			int bitrate = 16;
+			int bytesPerSample = (bitrate / 8) * InputChannels;
+			return pcmSamples.Length / bytesPerSample;
+		}
+
+		/// <summary>
+		/// Helper method to determine how many bytes are required for encoding to work.
+		/// </summary>
+		/// <param name="frameCount">Target frame size.</param>
+		/// <returns></returns>
+		public int FrameByteCount(int frameCount)
+		{
+			int bitrate = 16;
+			int bytesPerSample = (bitrate / 8) * InputChannels;
+			return frameCount * bytesPerSample;
+		}
+
+		/// <summary>
+		/// Gets the input sampling rate of the encoder.
+		/// </summary>
+		public int InputSamplingRate { get; private set; }
+
+		/// <summary>
+		/// Gets the number of channels of the encoder.
+		/// </summary>
+		public int InputChannels { get; private set; }
+
+		/// <summary>
+		/// Gets the coding mode of the encoder.
+		/// </summary>
+		public Application Application { get; private set; }
+
+		/// <summary>
+		/// Gets or sets the size of memory allocated for reading encoded data.
+		/// 4000 is recommended.
+		/// </summary>
+		public int MaxDataBytes { get; set; }
+
+		/// <summary>
+		/// Gets or sets the bitrate setting of the encoding.
+		/// </summary>
+		public int Bitrate
+		{
+			get
+			{
+				if (disposed)
+					throw new ObjectDisposedException("OpusEncoder");
+				int bitrate;
+				var ret = API.opus_encoder_ctl(_encoder, Ctl.GetBitrateRequest, out bitrate);
+				if (ret < 0)
+					throw new Exception("Encoder error - " + ((Errors)ret).ToString());
+				return bitrate;
+			}
+			set
+			{
+				if (disposed)
+					throw new ObjectDisposedException("OpusEncoder");
+				var ret = API.opus_encoder_ctl(_encoder, Ctl.SetBitrateRequest, value);
+				if (ret < 0)
+					throw new Exception("Encoder error - " + ((Errors)ret).ToString());
+			}
+		}
+
+		/// <summary>
+		/// Gets or sets whether Forward Error Correction is enabled.
+		/// </summary>
+		public bool ForwardErrorCorrection
+		{
+			get
+			{
+				if (_encoder == IntPtr.Zero)
+					throw new ObjectDisposedException("OpusEncoder");
+
+				int fec;
+				int ret = API.opus_encoder_ctl(_encoder, Ctl.GetInbandFECRequest, out fec);
+				if (ret < 0)
+					throw new Exception("Encoder error - " + ((Errors)ret).ToString());
+
+				return fec > 0;
+			}
+
+			set
+			{
+				if (_encoder == IntPtr.Zero)
+					throw new ObjectDisposedException("OpusEncoder");
+
+				var ret = API.opus_encoder_ctl(_encoder, Ctl.SetInbandFECRequest, value ? 1 : 0);
+				if (ret < 0)
+					throw new Exception("Encoder error - " + ((Errors)ret).ToString());
+			}
+		}
+
+		~OpusEncoder()
+		{
+			Dispose();
+		}
+
+		private bool disposed;
+		public void Dispose()
+		{
+			if (disposed)
+				return;
+
+			GC.SuppressFinalize(this);
+
+			if (_encoder != IntPtr.Zero)
+			{
+				API.opus_encoder_destroy(_encoder);
+				_encoder = IntPtr.Zero;
+			}
+
+			disposed = true;
+		}
+	}
+}