GARbro-mirror/ArcFormats/Hypatia/AudioADP.cs

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//! \file AudioADP.cs
//! \date 2018 Sep 21
//! \brief Hypatia compressed audio format.
//
// 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;
using GameRes.Utility;
namespace GameRes.Formats.Hypatia
{
[Export(typeof(AudioFormat))]
public class AdpAudio : AudioFormat
{
public override string Tag { get { return "ADP/HYPATIA"; } }
public override string Description { get { return "Hypatia compressed audio format"; } }
public override uint Signature { get { return 0x31504441; } } // 'ADP1'
public override bool CanWrite { get { return false; } }
public override SoundInput TryOpen (IBinaryStream file)
{
var header = file.ReadHeader (0x10);
int samples = header.ToInt32 (4);
uint sample_rate = header.ToUInt32 (8);
if (sample_rate < 8000 || sample_rate > 96000)
return null;
ushort channels = header.ToUInt16 (12);
if (channels != 1 && channels != 2)
return null;
samples *= channels;
var output = new byte[2 * samples];
var first = new AdpDecoder();
var second = first;
if (channels > 1)
second = new AdpDecoder();
int dst = 0;
while (samples > 0)
{
int v = file.ReadByte();
if (-1 == v)
break;
LittleEndian.Pack (first.DecodeSample (v), output, dst);
if (0 == --samples)
break;
dst += 2;
LittleEndian.Pack (second.DecodeSample (v >> 4), output, dst);
dst += 2;
--samples;
}
var format = new WaveFormat {
FormatTag = 1,
Channels = channels,
SamplesPerSecond = sample_rate,
AverageBytesPerSecond = 2u * channels * sample_rate,
BlockAlign = (ushort)(2 * channels),
BitsPerSample = 16,
};
var pcm = new MemoryStream (output);
var sound = new RawPcmInput (pcm, format);
file.Dispose();
return sound;
}
}
internal class AdpDecoder
{
int prev_sample;
int quant_idx = 0;
public AdpDecoder (int init_sample = 0)
{
prev_sample = init_sample;
}
public void Reset (short s, int q)
{
prev_sample = s;
quant_idx = q;
}
public short DecodeSample (int src)
{
src &= 0xF;
int sample = ScaleTable[src] * QuantizeTable[quant_idx] + prev_sample;
if (sample < -32768)
sample = -32768;
else if (sample > 0x7FFF)
sample = 0x7FFF;
prev_sample = sample;
quant_idx += IncrementTable[src];
if (quant_idx < 0)
quant_idx = 0;
else if (quant_idx > 48)
quant_idx = 48;
return (short)sample;
}
static readonly ushort[] QuantizeTable = {
0x0010, 0x0011, 0x0013, 0x0015, 0x0017, 0x0019, 0x001C, 0x001F, 0x0022, 0x0025, 0x0029, 0x002D,
0x0032, 0x0037, 0x003C, 0x0042, 0x0049, 0x0050, 0x0058, 0x0061, 0x006B, 0x0076, 0x0082, 0x008F,
0x009D, 0x00AD, 0x00BE, 0x00D1, 0x00E6, 0x00FD, 0x0117, 0x0133, 0x0151, 0x0173, 0x0198, 0x01C1,
0x01EE, 0x0220, 0x0256, 0x0292, 0x02D4, 0x031C, 0x036C, 0x03C3, 0x0424, 0x048E, 0x0502, 0x0583,
0x0610,
};
static readonly short[] ScaleTable = {
2, 6, 0xA, 0xE, 0x12, 0x16, 0x1A, 0x1E,
-2, -6, -0xA, -0xE, -0x12, -0x16, -0x1A, -0x1E,
};
static readonly sbyte[] IncrementTable = { -1, -1, -1, -1, 2, 4, 6, 8, -1, -1, -1, -1, 2, 4, 6, 8 };
}
}