GARbro-mirror/ArcFormats/Masys/ArcMGS.cs

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//! \file ArcMGS.cs
//! \date 2017 Nov 21
//! \brief MEGU audio archive implementation.
//
// Copyright (C) 2015-2017 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
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using GameRes.Formats.Abogado;
using GameRes.Utility;
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namespace GameRes.Formats.Megu
{
internal class MgsEntry : Entry
{
public ushort Channels;
public uint SamplesPerSecond;
public ushort BitsPerSample;
public byte Format;
}
[Export(typeof(ArchiveFormat))]
public class MgsOpener : ArchiveFormat
{
public override string Tag { get { return "MGS"; } }
public override string Description { get { return "Masys audio resources archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
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if (!file.View.AsciiEqual (0, "MGS"))
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return null;
int count = file.View.ReadInt16 (0x20);
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if (!IsSaneCount (count))
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return null;
int flag = file.View.ReadUInt16 (3);
var dir = new List<Entry> (count);
int index_offset = 0x22;
byte[] name_buf = new byte[16];
for (int i = 0; i < count; ++i)
{
byte format = file.View.ReadByte (index_offset);
int name_size = file.View.ReadByte (index_offset+9);
if (0 == name_size)
return null;
if (name_size > name_buf.Length)
Array.Resize (ref name_buf, name_size);
file.View.Read (index_offset+10, name_buf, 0, (uint)name_size);
if (100 == flag)
MgdOpener.Decrypt (name_buf, 0, name_size);
var name = Encodings.cp932.GetString (name_buf, 0, name_size);
name = Path.ChangeExtension (name, GetExtFromFormatId (format));
var entry = FormatCatalog.Instance.Create<MgsEntry> (name);
entry.Format = format;
if (0 == format)
{
entry.Channels = file.View.ReadUInt16 (index_offset+1);
entry.SamplesPerSecond = file.View.ReadUInt32 (index_offset+3);
entry.BitsPerSample = file.View.ReadUInt16 (index_offset+7);
}
index_offset += 10 + name_size;
entry.Size = file.View.ReadUInt32 (index_offset);
entry.Offset = file.View.ReadUInt32 (index_offset + 4);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 8;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var went = entry as MgsEntry;
if (null == went || went.Format != 0)
return arc.File.CreateStream (entry.Offset, entry.Size);
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var format = new WaveFormat {
FormatTag = 1,
Channels = (ushort)(went.Channels & 0x7FFF),
SamplesPerSecond = went.SamplesPerSecond,
};
Stream pcm;
uint pcm_size;
if (0 != (went.Channels & 0x8000))
{
format.BitsPerSample = 0x10;
var decoder = new PcmDecoder (went);
using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
{
var data = decoder.Decode (input);
pcm = new MemoryStream (data);
pcm_size = (uint)data.Length;
}
}
else
{
format.BitsPerSample = went.BitsPerSample;
pcm = arc.File.CreateStream (entry.Offset, entry.Size);
pcm_size = entry.Size;
}
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using (var riff = new MemoryStream (0x2C))
{
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ushort align = (ushort)(format.Channels * format.BitsPerSample / 8);
format.AverageBytesPerSecond = went.SamplesPerSecond * align;
format.BlockAlign = align;
WaveAudio.WriteRiffHeader (riff, format, pcm_size);
return new PrefixStream (riff.ToArray(), pcm);
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}
}
internal static string GetExtFromFormatId (int id)
{
switch (id)
{
case 0: return "wav";
case 1: return "mid";
default: return null;
}
}
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}
internal sealed class PcmDecoder
{
int Channels;
int BytesPerChunk;
byte[] m_output;
int m_dst;
public PcmDecoder (MgsEntry went)
{
Channels = went.Channels & 0x7FFF;
BytesPerChunk = went.BitsPerSample;
int output_size;
if (1 == Channels)
output_size = (int)went.Size / BytesPerChunk * ((BytesPerChunk - 4) * 4 + 2);
else
output_size = (int)went.Size / BytesPerChunk * ((BytesPerChunk - 8) * 4 + 4);
m_output = new byte[output_size];
}
void PutSample (short sample)
{
LittleEndian.Pack (sample, m_output, m_dst);
m_dst += 2;
}
public byte[] Decode (IBinaryStream input)
{
m_dst = 0;
if (1 == Channels)
{
var adp = new AdpDecoder();
while (input.PeekByte() != -1)
{
short sample = input.ReadInt16();
PutSample (sample);
int quant_idx = input.ReadUInt16() & 0xFF;
adp.Reset (sample, quant_idx);
for (int j = 0; j < BytesPerChunk - 4; ++j)
{
byte octet = input.ReadUInt8();
PutSample (adp.DecodeSample (octet));
PutSample (adp.DecodeSample (octet >> 4));
}
}
}
else
{
var first = new AdpDecoder();
var second = new AdpDecoder();
int samples_per_chunk = (BytesPerChunk - 8) / 8;
while (input.PeekByte() != -1)
{
short sample = input.ReadInt16();
PutSample (sample);
int quant_idx = input.ReadUInt16() & 0xFF;
first.Reset (sample, quant_idx);
sample = input.ReadInt16();
PutSample (sample);
quant_idx = input.ReadUInt16() & 0xFF;
second.Reset (sample, quant_idx);
for (int j = 0; j < samples_per_chunk; ++j)
{
uint first_code = input.ReadUInt32();
uint second_code = input.ReadUInt32();
for (int i = 0; i < 8; ++i)
{
PutSample (first.DecodeSample ((byte)first_code));
PutSample (second.DecodeSample ((byte)second_code));
first_code >>= 4;
second_code >>= 4;
}
}
}
}
return m_output;
}
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}
}