implemented Ogg/Opus audio.

Experimental/Experimental.csproj

@@ -35,6 +35,14 @@
     <BaseAddress>16777216</BaseAddress>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="Concentus, Version=1.1.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\Concentus.1.1.3\lib\portable-net45+win+wpa81+wp80\Concentus.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Concentus.Oggfile, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\Concentus.OggFile.1.0.0\lib\portable-net45+win+wpa81+wp80\Concentus.Oggfile.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="PresentationCore" />
     <Reference Include="System" />
     <Reference Include="System.ComponentModel.Composition" />
@@ -52,6 +60,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="CellWorks\ArcDB.cs" />
+    <Compile Include="Opus\AudioOPUS.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="WebP\ImageWEBP.cs" />
   </ItemGroup>

Experimental/Opus/AudioOPUS.cs

@@ -0,0 +1,99 @@
+//! \file       AudioOPUS.cs
+//! \date       Thu Dec 15 11:38:40 2016
+//! \brief      Handler for Ogg/Opus containers.
+//
+// Copyright (C) 2016 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System;
+using System.ComponentModel.Composition;
+using System.IO;
+using Concentus.Oggfile;
+using Concentus.Structs;
+
+namespace GameRes.Formats.Opus
+{
+    [Export(typeof(AudioFormat))]
+    public class OpusAudio : AudioFormat
+    {
+        public override string         Tag { get { return "OPUS"; } }
+        public override string Description { get { return "Ogg/Opus audio format"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override SoundInput TryOpen (IBinaryStream file)
+        {
+            if (file.Signature != 0x5367674F) // 'OggS'
+                return null;
+            var header = file.ReadHeader (0x1C);
+            int table_size = header[0x1A];
+            if (table_size < 1)
+                return null;
+            int header_size = header[0x1B];
+            if (header_size < 0x10)
+                return null;
+            int header_pos = 0x1B + table_size;
+            header = file.ReadHeader (header_pos + header_size);
+            if (!header.AsciiEqual (header_pos, "OpusHead"))
+                return null;
+            int channels = header[header_pos+9];
+//            int rate = header.ToInt32 (header_pos+0xC);
+            int rate = 48000;
+            file.Position = 0;
+            var decoder = OpusDecoder.Create (rate, channels);
+            var ogg_in = new OpusOggReadStream (decoder, file.AsStream);
+            var pcm = new MemoryStream();
+            try
+            {
+                using (var output = new BinaryWriter (pcm, System.Text.Encoding.UTF8, true))
+                {
+                    while (ogg_in.HasNextPacket)
+                    {
+                        var packet = ogg_in.DecodeNextPacket();
+                        if (packet != null)
+                        {
+                            for (int i = 0; i < packet.Length; ++i)
+                                output.Write (packet[i]);
+                        }
+                    }
+                }
+                var format = new WaveFormat
+                {
+                    FormatTag = 1,
+                    Channels = (ushort)channels,
+                    SamplesPerSecond = (uint)rate,
+                    BitsPerSample = 16,
+                };
+                format.BlockAlign = (ushort)(format.Channels*format.BitsPerSample/8);
+                format.AverageBytesPerSecond = format.SamplesPerSecond*format.BlockAlign;
+                pcm.Position = 0;
+                var sound = new RawPcmInput (pcm, format);
+                file.Dispose();
+                return sound;
+            }
+            catch
+            {
+                pcm.Dispose();
+                throw;
+            }
+        }
+    }
+}

Experimental/packages.config

@@ -1,4 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="Concentus" version="1.1.3" targetFramework="net45" />
+  <package id="Concentus.OggFile" version="1.0.0" targetFramework="net45" />
   <package id="System.Data.SQLite.Core" version="1.0.103" targetFramework="net45" />
 </packages>