added audio resource format.

GameRes/Audio.cs

@@ -0,0 +1,167 @@
+//! \file       Audio.cs
+//! \date       Tue Nov 04 17:35:54 2014
+//! \brief      audio format class.
+//
+// Copyright (C) 2014 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.IO;
+
+namespace GameRes
+{
+    public struct WaveFormat
+    {
+        public ushort FormatTag;
+        public ushort Channels;
+        public   uint SamplesPerSecond;
+        public   uint AverageBytesPerSecond;
+        public ushort BlockAlign;
+        public ushort BitsPerSample;
+    }
+
+    public abstract class SoundInput : Stream
+    {
+        protected Stream    m_input;
+        protected long      m_pcm_size;
+
+        public override bool  CanRead { get { return m_input.CanRead; } }
+        public override bool CanWrite { get { return false; } }
+        public override long   Length { get { return m_pcm_size; } }
+
+        public long PcmSize
+        {
+            get { return m_pcm_size; }
+            protected set { m_pcm_size = value; }
+        }
+
+        public abstract int SourceBitrate { get; }
+
+        public WaveFormat Format { get; protected set; }
+
+        protected SoundInput (Stream input)
+        {
+            m_input = input;
+        }
+
+        public virtual void Reset ()
+        {
+            Position = 0;
+        }
+
+        #region System.IO.Stream methods
+        public override void Flush()
+        {
+            m_input.Flush();
+        }
+
+        public override long Seek(long offset, SeekOrigin origin)
+        {
+            if (origin == SeekOrigin.Begin)
+                Position = offset;
+            else if (origin == SeekOrigin.Current)
+                Position += offset;
+            else
+                Position = Length + offset;
+            return Position;
+        }
+
+        public override void SetLength (long length)
+        {
+            throw new System.NotSupportedException ("SoundInput.SetLength method is not supported");
+        }
+
+        public override void Write (byte[] buffer, int offset, int count)
+        {
+            throw new System.NotSupportedException ("SoundInput.Write method is not supported");
+        }
+
+        public override void WriteByte (byte value)
+        {
+            throw new System.NotSupportedException ("SoundInput.WriteByte method is not supported");
+        }
+        #endregion
+
+        #region IDisposable Members
+        bool disposed = false;
+        protected override void Dispose (bool disposing)
+        {
+            if (!disposed)
+            {
+                if (disposing)
+                {
+                    m_input.Dispose();
+                }
+                disposed = true;
+                base.Dispose (disposing);
+            }
+        }
+        #endregion
+    }
+
+    public abstract class AudioFormat : IResource
+    {
+        public override string Type { get { return "audio"; } }
+
+        public abstract SoundInput TryOpen (Stream file);
+
+        public static SoundInput Read (Stream file)
+        {
+            var input = new MemoryStream();
+            file.CopyTo (input);
+            try
+            {
+                var sound = FindFormat (input);
+                if (null != sound)
+                    input = null; // input stream is owned by sound object now, don't dispose it
+                return sound;
+            }
+            finally
+            {
+                if (null != input)
+                    input.Dispose();
+            }
+        }
+
+        public static SoundInput FindFormat (Stream file)
+        {
+            uint signature = FormatCatalog.ReadSignature (file);
+            for (;;)
+            {
+                var range = FormatCatalog.Instance.LookupSignature<AudioFormat> (signature);
+                foreach (var impl in range)
+                {
+                    try
+                    {
+                        file.Position = 0;
+                        SoundInput sound = impl.TryOpen (file);
+                        if (null != sound)
+                            return sound;
+                    }
+                    catch { }
+                }
+                if (0 == signature)
+                    break;
+                signature = 0;
+            }
+            return null;
+        }
+    }
+}