preliminary WWA audio format implementation.

ArcFormats/AudioWWA.cs

@@ -0,0 +1,158 @@
+//! \file       AudioWWA.cs
+//! \date       Mon Aug 10 11:48:29 2015
+//! \brief      Wild Bug compressed audio format.
+//
+// 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;
+using System.ComponentModel.Composition;
+using System.IO;
+using GameRes.Utility;
+
+namespace GameRes.Formats.WildBug
+{
+    [Export(typeof(AudioFormat))]
+    public class WwaAudio : AudioFormat
+    {
+        public override string         Tag { get { return "WWA"; } }
+        public override string Description { get { return "Wild Bug's compressed audio format"; } }
+        public override uint     Signature { get { return 0x1A585057; } } // 'WPX'
+        
+        public override SoundInput TryOpen (Stream file)
+        {
+            var header = new byte[0x10];
+            if (header.Length != file.Read (header, 0, header.Length))
+                return null;
+            if (!Binary.AsciiEqual (header, 4, "WAV"))
+                return null;
+            int count = header[0xE];
+            int dir_size = header[0xF];
+            if (1 != header[0xC] || 0 == count || 0 == dir_size)
+                return null;
+
+            return new WwaInput (file, count, dir_size);
+        }
+
+        public override void Write (SoundInput source, Stream output)
+        {
+            throw new System.NotImplementedException ("WwaFormat.Write not implemenented");
+        }
+    }
+
+    internal class WwaInput : SoundInput
+    {
+        public override string SourceFormat { get { return "raw"; } }
+
+        public override int SourceBitrate
+        {
+            get { return (int)Format.AverageBytesPerSecond * 8; }
+        }
+
+        public WwaInput (Stream file, int count, int dir_size) : base (null)
+        {
+            file.Position = 0x10;
+            var header = new byte[count * dir_size];
+            if (header.Length != file.Read (header, 0, header.Length))
+                throw new InvalidFormatException();
+
+            var section = WpxSection.Find (header, 0x20, count, dir_size);
+            if (null == section || section.UnpackedSize < 0x10 || section.DataFormat != 0x80)
+                throw new InvalidFormatException();
+            file.Position = section.Offset;
+            Format = ReadFormat (file);
+
+            section = WpxSection.Find (header, 0x21, count, dir_size);
+            if (null == section)
+                throw new InvalidFormatException();
+
+            var reader = new WwaReader (file, section);
+            var data = reader.Unpack (section.DataFormat);
+            if (null == data)
+                throw new InvalidFormatException();
+            Source = new MemoryStream (data);
+            file.Dispose();
+        }
+
+        static WaveFormat ReadFormat (Stream file)
+        {
+            var format = new WaveFormat();
+            using (var input = new ArcView.Reader (file))
+            {
+                format.FormatTag = input.ReadUInt16 ();
+                format.Channels = input.ReadUInt16 ();
+                format.SamplesPerSecond = input.ReadUInt32 ();
+                format.AverageBytesPerSecond = input.ReadUInt32 ();
+                format.BlockAlign = input.ReadUInt16 ();
+                format.BitsPerSample = input.ReadUInt16 ();
+            }
+            return format;
+        }
+
+        #region IO.Stream methods
+        public override long Position
+        {
+            get { return Source.Position; }
+            set { Source.Position = value; }
+        }
+
+        public override bool CanSeek { get { return Source.CanSeek; } }
+
+        public override long Seek (long offset, SeekOrigin origin)
+        {
+            return Source.Seek (offset, origin);
+        }
+
+        public override int Read (byte[] buffer, int offset, int count)
+        {
+            return Source.Read (buffer, offset, count);
+        }
+
+        public override int ReadByte ()
+        {
+            return Source.ReadByte();
+        }
+        #endregion
+    }
+
+    internal class WwaReader
+    {
+        Stream      m_input;
+        int         m_packed_size;
+        byte[]      m_output;
+
+        public byte[] Data { get { return m_output; } }
+
+        public WwaReader (Stream input, WpxSection section)
+        {
+            m_input = input;
+            m_input.Position = section.Offset;
+            m_packed_size = section.PackedSize;
+            m_output = new byte[section.UnpackedSize];
+        }
+
+        public byte[] Unpack (int format)
+        {
+            throw new NotImplementedException();
+            // sub_46B9B7 ??
+        }
+    }
+}