GARbro-mirror/Legacy/Eve/AudioWV.cs

132 lines
4.8 KiB
C#

//! \file AudioWV.cs
//! \date 2018 Apr 06
//! \brief Eve compressed audio.
//
// Copyright (C) 2018 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;
namespace GameRes.Formats.Eve
{
[Export(typeof(AudioFormat))]
public sealed class Wv3Audio : AudioFormat
{
public override string Tag { get { return "WAV/WV3"; } }
public override string Description { get { return "Eve compressed audio format"; } }
public override uint Signature { get { return 0x2E335657; } } // 'WV3.0'
public override bool CanWrite { get { return false; } }
public override SoundInput TryOpen (IBinaryStream file)
{
var header = file.ReadHeader (0x26);
if (header[4] != '0')
return null;
var decoder = new Wv3Decoder (file);
var data = decoder.Decode();
var pcm = new MemoryStream (data);
return new RawPcmInput (pcm, decoder.Format);
}
}
internal class Wv3Decoder
{
IBinaryStream m_input;
uint m_data_offset;
int m_sample_count;
byte[] m_output;
WaveFormat m_format;
public WaveFormat Format { get { return m_format; } }
public Wv3Decoder (IBinaryStream file)
{
m_input = file;
var header = m_input.ReadHeader (0x26);
m_data_offset = header.ToUInt32 (6);
m_sample_count = header.ToInt32 (0x1A);
m_output = new byte[m_sample_count * 280];
m_format = new WaveFormat {
FormatTag = 1,
Channels = 2,
SamplesPerSecond = header.ToUInt32 (0xE),
BitsPerSample = 16,
BlockAlign = 4
};
m_format.SetBPS();
}
public byte[] Decode ()
{
m_input.Position = m_data_offset;
var input = new byte[72];
var output = new short[140];
var back = new int[2,2];
int out_pos = 0;
for (int i = 0; i < m_sample_count; ++i)
{
if (72 != m_input.Read (input, 0, 72))
break;
for (int k = 0; k < 2; ++k)
{
byte v = input[k];
int shift = v & 0xF;
v >>= 4;
short scale0 = ScaleMap[v+8];
short scale1 = ScaleMap[v];
int src = 35 * k + 2;
for (int j = 0; j < 35; ++j)
{
int dst = k + (j << 2);
v = input[src++];
int x = v & 0xF;
if ((x & 8) != 0)
x |= -0x10;
int sample = ((scale0 * back[0,k] + scale1 * back[1,k]) >> 8) + (x << shift);
back[0,k] = back[1,k];
back[1,k] = sample;
output[dst] = (short)sample;
x = v >> 4;
if ((x & 8) != 0)
x |= -0x10;
sample = ((scale0 * back[0,k] + scale1 * back[1,k]) >> 8) + (x << shift);
back[0,k] = back[1,k];
back[1,k] = sample;
output[dst + 2] = (short)sample;
}
}
Buffer.BlockCopy (output, 0, m_output, out_pos, 280);
out_pos += 280;
}
return m_output;
}
static readonly short[] ScaleMap = {
0, 240, 128, 192, 320, 460, 392, 488,
0, 0, -12, -56, -88, -208, -220, -240,
};
}
}