added support for WAVE sound files

closes #2174

OpenRA.FileFormats/FileFormats/WavLoader.cs

@@ -0,0 +1,78 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.IO;
+using System.Text;
+
+namespace OpenRA.FileFormats
+{
+	public class WavLoader
+	{
+		public readonly int FileSize;
+		public readonly string Format;
+
+		public readonly int FmtChunkSize;
+		public readonly int AudioFormat;
+		public readonly int Channels;
+		public readonly int SampleRate;
+		public readonly int ByteRate;
+		public readonly int BlockAlign;
+		public readonly int BitsPerSample;
+
+		public readonly int DataSize;
+		public readonly byte[] RawOutput;
+
+		public readonly int ListChunkSize;
+
+		public WavLoader(Stream s)
+		{
+			while (s.Position < s.Length)
+			{
+				if ((s.Position & 1) == 1)
+					s.ReadByte(); // Alignment
+
+				var type = s.ReadASCII(4);
+				switch (type)
+				{
+					case "RIFF":
+						FileSize = s.ReadInt32();
+						Format = s.ReadASCII(4);
+						if (Format != "WAVE")
+							throw new NotSupportedException("Not a canonical WAVE file.");
+						break;
+					case "fmt ":
+						FmtChunkSize = s.ReadInt32();
+						if (FmtChunkSize != 16)
+							throw new NotSupportedException("{0} fmt chunk size is not a supported encoding scheme.".F(FmtChunkSize));
+						AudioFormat = s.ReadInt16();
+						if (AudioFormat != 1)
+							throw new NotSupportedException("Non-PCM compression is not supported.");
+						Channels = s.ReadInt16();
+						SampleRate = s.ReadInt32();
+						ByteRate = s.ReadInt32();
+						BlockAlign = s.ReadInt16();
+						BitsPerSample = s.ReadInt16();
+						break;
+					case "data":
+						DataSize = s.ReadInt32();
+						RawOutput = s.ReadBytes(DataSize);
+						break;
+					case "LIST":
+						ListChunkSize = s.ReadInt32();
+						s.ReadBytes(ListChunkSize); // Ignore annotation meta data.
+						break;
+					default:
+						throw new NotSupportedException("{0} chunks are not supported.".F(type));
+				}
+			}
+		}
+	}
+}

OpenRA.FileFormats/OpenRA.FileFormats.csproj

@@ -144,6 +144,7 @@
     <Compile Include="Graphics\VxlReader.cs" />
     <Compile Include="Graphics\HvaReader.cs" />
     <Compile Include="StreamExts.cs" />
+    <Compile Include="FileFormats\WavLoader.cs" />
   </ItemGroup>
   <ItemGroup>
     <BootstrapperPackage Include="Microsoft.Net.Client.3.5">

OpenRA.Game/Sound.cs

@@ -35,9 +35,17 @@ namespace OpenRA
 				return null;
 			}
 
+			if (filename.ToLowerInvariant().EndsWith("wav"))
+				return LoadWave(new WavLoader(FileSystem.Open(filename)));
+			else
 				return LoadSoundRaw(AudLoader.LoadSound(FileSystem.Open(filename)));
 		}
 
+		static ISoundSource LoadWave(WavLoader wave)
+		{
+			return soundEngine.AddSoundSourceFromMemory(wave.RawOutput, wave.Channels, wave.BitsPerSample, wave.SampleRate);
+		}
+
 		static ISoundSource LoadSoundRaw(byte[] rawData)
 		{
 			return soundEngine.AddSoundSourceFromMemory(rawData, 1, 16, 22050);