added audio resource format.

GameRes/AudioWAV.cs

@@ -0,0 +1,158 @@
+//! \file       AudioWAV.cs
+//! \date       Tue Nov 04 18:22:37 2014
+//! \brief      WAVE audio format implementation.
+//
+// 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.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes
+{
+    public class WaveInput : SoundInput
+    {
+        long        m_data_offset;
+
+        public override long Position
+        {
+            get { return m_input.Position - m_data_offset; }
+            set { m_input.Position = m_data_offset + value; }
+        }
+
+        public override bool CanSeek { get { return m_input.CanSeek; } }
+
+        public override int SourceBitrate
+        {
+            get { return (int)Format.AverageBytesPerSecond * 8; }
+        }
+
+        public WaveInput (Stream file) : base (file)
+        {
+            using (var input = new BinaryReader (m_input, System.Text.Encoding.UTF8, true))
+            {
+                input.BaseStream.Seek (8, SeekOrigin.Current);
+                uint header = input.ReadUInt32();
+                if (header != 0x45564157)
+                    throw new InvalidFormatException ("Invalid WAVE file format.");
+
+                bool found_fmt = false;
+                bool found_data = false;
+                long current_offset = input.BaseStream.Position;
+
+                while (!found_fmt || !found_data)
+                {
+                    uint header0 = input.ReadUInt32();
+                    uint header1 = input.ReadUInt32();
+
+                    if (!found_fmt && 0x20746d66 == header0)
+                    {
+                        if (header1 < 0x10)
+                            throw new InvalidFormatException ("Invalid WAVE file format");
+
+                        ushort tag = input.ReadUInt16();
+                        if (1 != tag)
+                            throw new InvalidFormatException ("Unsupported WAVE file format.");
+
+                        var format = new WaveFormat();
+                        format.FormatTag                = tag;
+                        format.Channels                 = input.ReadUInt16();
+                        format.SamplesPerSecond         = input.ReadUInt32();
+                        format.AverageBytesPerSecond    = input.ReadUInt32();
+                        format.BlockAlign               = input.ReadUInt16();
+                        format.BitsPerSample            = input.ReadUInt16();
+                        this.Format = format;
+
+                        found_fmt = true;
+                        current_offset += 8 + ((header1 + 1) & ~1);
+                        input.BaseStream.Seek (current_offset, SeekOrigin.Begin);
+                        continue;
+                    }
+                    if (!found_data && 0x61746164 == header0)
+                    {
+                        found_data = true;
+                        m_data_offset = current_offset + 8;
+                        this.PcmSize = header1;
+                        if (found_fmt)
+                            break;
+                    }
+                    long chunk_size = (header1 + 1) & ~1;
+                    input.BaseStream.Seek (chunk_size, SeekOrigin.Current);
+
+                    current_offset += 8 + chunk_size;
+                }
+                this.Reset();
+            }
+        }
+
+        public override void Reset ()
+        {
+            m_input.Seek (m_data_offset, SeekOrigin.Begin);
+        }
+
+        public override long Seek (long offset, SeekOrigin origin)
+        {
+            if (SeekOrigin.Begin == origin)
+                offset += m_data_offset;
+            else if (SeekOrigin.Current == origin)
+                offset = m_input.Position + offset;
+            else if (SeekOrigin.End == origin)
+                offset = m_data_offset + PcmSize + offset;
+
+            if (offset < m_data_offset)
+                offset = m_data_offset;
+            else if (offset > m_data_offset + PcmSize)
+                offset = m_data_offset + PcmSize;
+
+            offset = m_input.Seek (offset, SeekOrigin.Begin);
+            return offset - m_data_offset;
+        }
+
+        public override int Read (byte[] buffer, int offset, int count)
+        {
+            long remaining = PcmSize - Position;
+            if (count > remaining)
+                count = (int)remaining;
+            return m_input.Read (buffer, offset, count);
+        }
+
+        public override int ReadByte ()
+        {
+            if (Position < PcmSize)
+                return m_input.ReadByte();
+            else
+                return -1;
+        }
+    }
+
+    [Export(typeof(AudioFormat))]
+    public class WaveAudio : AudioFormat
+    {
+        public override string         Tag { get { return "WAV"; } }
+        public override string Description { get { return "Wave audio format"; } }
+        public override uint     Signature { get { return 0x46464952; } } // 'RIFF'
+
+        public override SoundInput TryOpen (Stream file)
+        {
+            return new WaveInput (file);
+        }
+    }
+}