GARbro-mirror/ArcFormats/WildBug/AudioWWA.cs

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//! \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
}
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internal class WwaReader : WpxDecoder
{
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public WwaReader (Stream input, WpxSection section) : base (input, section)
{
ResetInput();
}
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public byte[] Unpack (int flags) // sub_46B16C
{
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if (0 == (flags & 0x80) && 0 != PackedSize)
{
if (0 != (flags & 8))
{
if (0 != (flags & 4))
throw new NotImplementedException ();
else if (0 != (flags & 2))
return UnpackVB(); // sub_461B34
}
throw new NotImplementedException ();
}
else
return ReadUncompressed();
}
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byte[] UnpackVB ()
{
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m_available = FillBuffer();
if (0 == m_available)
return null;
var ref_table = new byte[0x10000];
int v6 = -1 & 3;
m_output[0] = m_buffer[0];
int dst = 1;
int remaining = m_output.Length - 1;
m_current = 1 + v6 + 128;
if (!FillRefTable (ref_table, 1 + v6))
return null;
while (remaining > 0)
{
while (0 != GetNextBit())
{
int v23 = 0;
int v24 = 0;
int v25 = 16384;
for (;;)
{
++v23;
if (0 != GetNextBit())
v24 |= v25;
if (ref_table[2 * v24] == v23)
break;
v25 >>= 1;
if (0 == v25)
return null;
}
m_output[dst++] = ref_table[2 * v24 + 1];
--remaining;
if (0 == remaining)
return m_output;
}
int v26 = ReadNext();
int src_offset = dst - v26 - 1;
int count = 2;
if (0 == GetNextBit())
{
count += ReadCount();
}
if (remaining < count)
return null;
Binary.CopyOverlapped (m_output, src_offset, dst, count);
dst += count;
remaining -= count;
}
return m_output;
}
}
}