BGI audio format interpreter moved to separate class.

ArcFormats/ArcFormats.csproj

@@ -63,6 +63,7 @@
   <ItemGroup>
     <Compile Include="Amaterasu\ImageGRP.cs" />
     <Compile Include="BitStream.cs" />
+    <Compile Include="Ethornell\AudioBGI.cs" />
     <Compile Include="Lilim\ArcABM.cs" />
     <Compile Include="ActiveSoft\ArcADPACK.cs" />
     <Compile Include="ArcAdvCls.cs" />

ArcFormats/Ethornell/AudioBGI.cs

@@ -0,0 +1,59 @@
+//! \file       AudioBGI.cs
+//! \date       Sat Aug 29 21:44:06 2015
+//! \brief      BURIKO engine audio file (Ogg/Vorbis)
+//
+// Copyright (C) 2015 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.ComponentModel.Composition;
+using System.IO;
+using GameRes.Utility;
+
+namespace GameRes.Formats.BGI
+{
+    [Export(typeof(AudioFormat))]
+    public class BgiAudio : OggAudio
+    {
+        public override string         Tag { get { return "BW"; } }
+        public override string Description { get { return "BGI/Ethornell engine audio (Ogg/Vorbis)"; } }
+        public override uint     Signature { get { return 0; } }
+
+        public BgiAudio ()
+        {
+            Extensions = new string[] { "" };
+        }
+        
+        public override SoundInput TryOpen (Stream file)
+        {
+            var header = new byte[8];
+            if (8 != file.Read (header, 0, 8))
+                return null;
+            if (!Binary.AsciiEqual (header, 4, "bw  "))
+                return null;
+            uint offset = LittleEndian.ToUInt32 (header, 0);
+            file.Seek (offset, SeekOrigin.Begin);
+
+            var input = new StreamRegion (file, file.Position);
+            return new OggInput (input);
+            // input is left undisposed in case of exception.
+        }
+    }
+}