mirror of
https://github.com/crskycode/GARbro.git
synced 2024-12-29 22:34:13 +08:00
244 lines
8.9 KiB
C#
244 lines
8.9 KiB
C#
//! \file AudioNWA.cs
|
|
//! \date Mon Apr 18 15:10:59 2016
|
|
//! \brief RealLive audio format.
|
|
//
|
|
// Copyright (C) 2016 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.RealLive
|
|
{
|
|
internal class NwaMetaData
|
|
{
|
|
public WaveFormat Format;
|
|
public int Compression;
|
|
public bool RunLengthEncoded;
|
|
public int BlockCount;
|
|
public int PcmSize;
|
|
public int PackedSize;
|
|
public int SampleCount;
|
|
public int BlockSize;
|
|
public int FinalBlockSize;
|
|
}
|
|
|
|
[Export(typeof(AudioFormat))]
|
|
public class NwaAudio : AudioFormat
|
|
{
|
|
public override string Tag { get { return "NWA"; } }
|
|
public override string Description { get { return "RealLive engine audio format"; } }
|
|
public override uint Signature { get { return 0; } }
|
|
|
|
public override SoundInput TryOpen (IBinaryStream file)
|
|
{
|
|
var header = file.ReadHeader (0x28);
|
|
ushort channels = header.ToUInt16 (0);
|
|
if (0 == channels || channels > 2)
|
|
return null;
|
|
ushort bps = header.ToUInt16 (2);
|
|
if (bps != 8 && bps != 16)
|
|
return null;
|
|
var info = new NwaMetaData
|
|
{
|
|
Compression = header.ToInt32 (8),
|
|
RunLengthEncoded = 0 != header.ToInt32 (0xC),
|
|
BlockCount = header.ToInt32 (0x10),
|
|
PcmSize = header.ToInt32 (0x14),
|
|
PackedSize = header.ToInt32 (0x18),
|
|
SampleCount = header.ToInt32 (0x1C),
|
|
BlockSize = header.ToInt32 (0x20),
|
|
FinalBlockSize = header.ToInt32 (0x24),
|
|
};
|
|
if (info.PcmSize <= 0)
|
|
return null;
|
|
info.Format.FormatTag = 1;
|
|
info.Format.Channels = channels;
|
|
info.Format.BitsPerSample = bps;
|
|
info.Format.SamplesPerSecond = header.ToUInt32 (4);
|
|
info.Format.BlockAlign = (ushort)(channels * bps/8);
|
|
info.Format.AverageBytesPerSecond = info.Format.BlockAlign * info.Format.SamplesPerSecond;
|
|
if (-1 == info.Compression)
|
|
{
|
|
if (info.PcmSize > file.Length - 0x2C)
|
|
return null;
|
|
return new RawPcmInput (new StreamRegion (file.AsStream, 0x2C, info.PcmSize), info.Format);
|
|
}
|
|
if (info.Compression > 5)
|
|
return null;
|
|
if (info.PcmSize != info.SampleCount * bps / 8)
|
|
return null;
|
|
using (var decoder = new NwaDecoder (file, info))
|
|
{
|
|
decoder.Decode();
|
|
var pcm = new MemoryStream (decoder.Output);
|
|
var sound = new RawPcmInput (pcm, info.Format);
|
|
file.Dispose();
|
|
return sound;
|
|
}
|
|
}
|
|
}
|
|
|
|
internal sealed class NwaDecoder : IDisposable
|
|
{
|
|
IBinaryStream m_input;
|
|
byte[] m_output;
|
|
NwaMetaData m_info;
|
|
short[] m_sample;
|
|
LsbBitStream m_bits;
|
|
|
|
public byte[] Output { get { return m_output; } }
|
|
|
|
|
|
public NwaDecoder (IBinaryStream input, NwaMetaData info)
|
|
{
|
|
m_input = input;
|
|
m_info = info;
|
|
m_output = new byte[m_info.PcmSize];
|
|
m_sample = new short[2];
|
|
m_bits = new LsbBitStream (input.AsStream, true);
|
|
}
|
|
|
|
int m_dst;
|
|
|
|
public void Decode ()
|
|
{
|
|
m_input.Position = 0x2C;
|
|
var offsets = new uint[m_info.BlockCount];
|
|
for (int i = 0; i < offsets.Length; ++i)
|
|
offsets[i] = m_input.ReadUInt32();
|
|
|
|
m_dst = 0;
|
|
for (int i = 0; i < offsets.Length-1; ++i)
|
|
{
|
|
m_input.Position = offsets[i];
|
|
DecodeBlock (m_info.BlockSize);
|
|
}
|
|
m_input.Position = offsets[offsets.Length-1];
|
|
if (m_info.FinalBlockSize > 0)
|
|
DecodeBlock (m_info.FinalBlockSize);
|
|
else
|
|
DecodeBlock (m_info.BlockSize);
|
|
}
|
|
|
|
void DecodeBlock (int block_size)
|
|
{
|
|
int channel_count = m_info.Format.Channels;
|
|
for (int c = 0; c < channel_count; ++c)
|
|
{
|
|
if (8 == m_info.Format.BitsPerSample)
|
|
m_sample[c] = m_input.ReadUInt8();
|
|
else
|
|
m_sample[c] = m_input.ReadInt16();
|
|
}
|
|
m_bits.Reset();
|
|
int channel = 0;
|
|
int repeat_count = 0;
|
|
for (int i = 0; i < block_size; ++i)
|
|
{
|
|
if (0 == repeat_count)
|
|
{
|
|
int ctl = m_bits.GetBits (3);
|
|
if (7 == ctl)
|
|
{
|
|
if (1 == m_bits.GetNextBit())
|
|
{
|
|
m_sample[channel] = 0;
|
|
}
|
|
else
|
|
{
|
|
int bits = 8;
|
|
int shift = 9;
|
|
if (m_info.Compression < 3)
|
|
{
|
|
bits -= m_info.Compression;
|
|
shift += m_info.Compression;
|
|
}
|
|
int sign_bit = 1 << (bits - 1);
|
|
int mask = sign_bit - 1;
|
|
int val = m_bits.GetBits (bits);
|
|
if (0 != (val & sign_bit))
|
|
m_sample[channel] -= (short)((val & mask) << shift);
|
|
else
|
|
m_sample[channel] += (short)((val & mask) << shift);
|
|
}
|
|
}
|
|
else if (ctl != 0)
|
|
{
|
|
int bits, shift;
|
|
if (m_info.Compression < 3)
|
|
{
|
|
bits = 5 - m_info.Compression;
|
|
shift = 2 + ctl + m_info.Compression;
|
|
}
|
|
else
|
|
{
|
|
bits = 3 + m_info.Compression;
|
|
shift = 1 + ctl;
|
|
}
|
|
int sign_bit = 1 << (bits - 1);
|
|
int mask = sign_bit - 1;
|
|
int val = m_bits.GetBits (bits);
|
|
if (0 != (val & sign_bit))
|
|
m_sample[channel] -= (short)((val & mask) << shift);
|
|
else
|
|
m_sample[channel] += (short)((val & mask) << shift);
|
|
}
|
|
else if (m_info.RunLengthEncoded)
|
|
{
|
|
repeat_count = m_bits.GetNextBit();
|
|
if (1 == repeat_count)
|
|
{
|
|
repeat_count = m_bits.GetBits (2);
|
|
if (3 == repeat_count)
|
|
repeat_count = m_bits.GetBits (8);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
--repeat_count;
|
|
}
|
|
|
|
if (8 == m_info.Format.BitsPerSample)
|
|
{
|
|
m_output[m_dst++] = (byte)m_sample[channel];
|
|
}
|
|
else
|
|
{
|
|
LittleEndian.Pack (m_sample[channel], m_output, m_dst);
|
|
m_dst += 2;
|
|
}
|
|
if (2 == channel_count)
|
|
channel ^= 1;
|
|
}
|
|
}
|
|
|
|
#region IDisposable Members
|
|
public void Dispose ()
|
|
{
|
|
}
|
|
#endregion
|
|
}
|
|
}
|