mirror of
https://github.com/crskycode/GARbro.git
synced 2024-12-25 04:14:13 +08:00
349 lines
14 KiB
C#
349 lines
14 KiB
C#
|
//! \file AudioEMS.cs
|
||
|
|
//! \date 2018 Mar 09
|
||
|
|
//! \brief EMSAC 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.Entis
|
||
|
|
{
|
||
|
|
internal class EmsacSoundInfo
|
||
|
|
{
|
||
|
|
public int Version; // field_00
|
||
|
|
public CvType Transformation; // field_04
|
||
|
|
public EriCode Architecture; // field_08
|
||
|
|
public int ChannelCount; // field_0C
|
||
|
|
public uint SamplesPerSec; // field_10
|
||
|
|
public uint BlocksetCount; // field_14
|
||
|
|
public int SubbandDegree; // field_18
|
||
|
|
public int AllSampleCount; // field_1C
|
||
|
|
public int LappedDegree; // field_20
|
||
|
|
}
|
||
|
|
|
||
|
|
[Export(typeof(AudioFormat))]
|
||
|
|
public sealed class EmsAudio : AudioFormat
|
||
|
|
{
|
||
|
|
public override string Tag { get { return "EMS"; } }
|
||
|
|
public override string Description { get { return "EMSAC compressed audio format"; } }
|
||
|
|
public override uint Signature { get { return 0x69746E45; } } // 'Entis'
|
||
|
|
|
||
|
|
public override SoundInput TryOpen (IBinaryStream file)
|
||
|
|
{
|
||
|
|
var header = file.ReadHeader (0x40);
|
||
|
|
if (0x02000200 != header.ToUInt32 (8))
|
||
|
|
return null;
|
||
|
|
if (!header.AsciiEqual (0x10, "EMSAC-Sound-2"))
|
||
|
|
return null;
|
||
|
|
var decoder = new EmsacDecoder (file);
|
||
|
|
var pcm = decoder.Decode();
|
||
|
|
var sound = new RawPcmInput (pcm, decoder.Format);
|
||
|
|
file.Dispose();
|
||
|
|
return sound;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
internal class EmsacDecoder
|
||
|
|
{
|
||
|
|
Stream m_input;
|
||
|
|
EmsacSoundInfo m_info;
|
||
|
|
long m_stream_pos;
|
||
|
|
WaveFormat m_format;
|
||
|
|
|
||
|
|
public WaveFormat Format { get { return m_format; } }
|
||
|
|
|
||
|
|
const ushort BitsPerSample = 16;
|
||
|
|
|
||
|
|
public EmsacDecoder (IBinaryStream input)
|
||
|
|
{
|
||
|
|
m_input = input.AsStream;
|
||
|
|
}
|
||
|
|
|
||
|
|
public Stream Decode ()
|
||
|
|
{
|
||
|
|
m_input.Position = 0x40;
|
||
|
|
using (var erif = new EriFile (m_input))
|
||
|
|
{
|
||
|
|
ReadHeader (erif);
|
||
|
|
int total_bytes = m_info.AllSampleCount * BitsPerSample / 8;
|
||
|
|
var output = new MemoryStream (total_bytes);
|
||
|
|
try
|
||
|
|
{
|
||
|
|
var buffer = new byte[0x10000];
|
||
|
|
var decoded = new byte[0x10000];
|
||
|
|
erif.BaseStream.Position = m_stream_pos;
|
||
|
|
while (total_bytes > 0)
|
||
|
|
{
|
||
|
|
var section = erif.ReadSection();
|
||
|
|
if (section.Id != "SoundStm")
|
||
|
|
break;
|
||
|
|
int stm_length = (int)section.Length;
|
||
|
|
if (stm_length > buffer.Length)
|
||
|
|
buffer = new byte[stm_length];
|
||
|
|
erif.Read (m_buffer, 0, stm_length);
|
||
|
|
int length = m_buffer.ToInt32 (4) * m_lappedSubband;
|
||
|
|
if (length > decoded.Length)
|
||
|
|
decoded = new byte[length];
|
||
|
|
|
||
|
|
DecodeBlock (buffer, decoded);
|
||
|
|
length = Math.Min (length, total_bytes);
|
||
|
|
output.Write (decoded, 0, length);
|
||
|
|
total_bytes -= length;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
catch (EndOfStreamException) { /* ignore EOF errors */ }
|
||
|
|
output.Position = 0;
|
||
|
|
return output;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void DecodeBlock (byte[] input, byte[] output)
|
||
|
|
{
|
||
|
|
if (m_exp.Version > 0x20100)
|
||
|
|
throw new InvalidFormatException ("Not supported EMSAC version.");
|
||
|
|
int channels = m_exp.ChannelCount;
|
||
|
|
if (0 == channels || channels > 2)
|
||
|
|
throw new InvalidFormatException ("Invalid number of channels.");
|
||
|
|
int subband_degree = 0;
|
||
|
|
int v84 = 1;
|
||
|
|
bool use_dct = 0 != (m_exp.Transformation & 1);
|
||
|
|
if (use_dct)
|
||
|
|
{
|
||
|
|
subband_degree = m_exp.SubbandDegree;
|
||
|
|
v84 <<= subband_degree;
|
||
|
|
}
|
||
|
|
int subband = 1 << subband_degree;
|
||
|
|
int sample_count = input.ToInt32 (4);
|
||
|
|
int samples_per_channel = sample_count / channels;
|
||
|
|
if (0 == samples_per_channel)
|
||
|
|
throw new InvalidFormatException ("Invalid number of samples.");
|
||
|
|
int v85 = samples_per_channel;
|
||
|
|
var v73 = new int[channels][];
|
||
|
|
var v75 = new int[subband]; // workBuf
|
||
|
|
var v74 = new int[subband]; // weightTable
|
||
|
|
var v13 = new int[subband * channels]; // internalBuf
|
||
|
|
var sampleBuf = new short[sample_count];
|
||
|
|
for (int i = 0; i < channels; ++i)
|
||
|
|
{
|
||
|
|
v73[i] = new int[subband];
|
||
|
|
}
|
||
|
|
int dst = 0;
|
||
|
|
int src = 8;
|
||
|
|
int v77 = src + sample_count;
|
||
|
|
object sym_table;
|
||
|
|
var v16 = CreateDecoderSymbolTable (input, v77, out sym_table);
|
||
|
|
for (int i = 0; i < samples_per_channel; ++i)
|
||
|
|
{
|
||
|
|
for (int c = 0; c < channels; ++c)
|
||
|
|
{
|
||
|
|
var v72 = v73[c];
|
||
|
|
int v19 = DecodeSymbols (v16, sym_table, v75, subband);
|
||
|
|
if (v19 < subband)
|
||
|
|
throw new InvalidFormatException();
|
||
|
|
byte code = input[src++];
|
||
|
|
InverseQuantumize (v74, v75, subband, code);
|
||
|
|
if (use_dct)
|
||
|
|
{
|
||
|
|
InverseDCT (v72, v74, 2, subband_degree);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
Buffer.BlockCopy (v74, v72, 4 * subband);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
int cur_pos = dst;
|
||
|
|
for (int c = 0; c < channels; ++c)
|
||
|
|
{
|
||
|
|
int pos = cur_pos;
|
||
|
|
var v32 = v73[c];
|
||
|
|
for (int i = 0; i < subband; ++i)
|
||
|
|
{
|
||
|
|
int v34 = v32[i];
|
||
|
|
int v35 = v34;
|
||
|
|
int v36 = v34 >> 23;
|
||
|
|
int v37 = v34 & 0x7FFFFF | 0x800000;
|
||
|
|
int v38 = v35 >> 31;
|
||
|
|
int v39 = -((byte)v36 - 150);
|
||
|
|
if (v39 > 8)
|
||
|
|
{
|
||
|
|
if (v39 <= 31)
|
||
|
|
v40 = v38 ^ (v38 + __CFSHR__(v37, v39) + (v37 >> v39));
|
||
|
|
else
|
||
|
|
v40 = 0;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
v40 = v38 ^ (v38 + 0x7FFF);
|
||
|
|
}
|
||
|
|
sampleBuf[pos] = (short)v40;
|
||
|
|
pos += channels;
|
||
|
|
}
|
||
|
|
++cur_pos;
|
||
|
|
}
|
||
|
|
dst += channels * subband;
|
||
|
|
}
|
||
|
|
dst = 0;
|
||
|
|
for (int c = 0; c < channels; ++c)
|
||
|
|
{
|
||
|
|
int src = c;
|
||
|
|
short diff = (short)(m_exp.CompState[c] - sampleBuf[src]);
|
||
|
|
int pos = 0;
|
||
|
|
for (int i = 0; i < 12; ++i)
|
||
|
|
{
|
||
|
|
int sample = diff + sampleBuf[src+pos];
|
||
|
|
sampleBuf[src+pos] = Clamp (sample);
|
||
|
|
pos += channels;
|
||
|
|
diff >>= 1;
|
||
|
|
}
|
||
|
|
int v48 = samples_per_channel - 1;
|
||
|
|
for (int i = 1; i < samples_per_channel; ++i)
|
||
|
|
{
|
||
|
|
v42 = (_WORD *)((char *)v42 + (step << subbandDegree));
|
||
|
|
v49 = v42[step / 2] + v42[-step / 2] - v42[-step] - *v42;
|
||
|
|
v70 = (short)(v49 + v42[-step / 2] + *v42) >> 1;
|
||
|
|
v50 = (short)(v42[-step / 2] + *v42 - v49) >> 1;
|
||
|
|
v52 = -step;
|
||
|
|
v53 = (short)(v50 - v42[-step / 2]);
|
||
|
|
for (int j = 0; j < 12; ++j)
|
||
|
|
{
|
||
|
|
int v54 = v53 + *(_WORD *)((char *)v42 + v52);
|
||
|
|
*(_WORD *)((char *)v42 + v52) = Clamp (v54);
|
||
|
|
v52 -= step;
|
||
|
|
v53 >>= 1;
|
||
|
|
}
|
||
|
|
v55 = 0;
|
||
|
|
v57 = (short)(v70 - *v42);
|
||
|
|
for (int j = 0; j < 12; ++j)
|
||
|
|
{
|
||
|
|
int v58 = v57 + *(_WORD *)((char *)v42 + v55);
|
||
|
|
*(_WORD *)((char *)v42 + v55) = Clamp (v58);
|
||
|
|
v55 += step;
|
||
|
|
v57 >>= 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
int v59 = 2 * *(_WORD *)((char *)v42 + (step << subbandDegree) - step)
|
||
|
|
- *(_WORD *)((char *)v42 + (step << subbandDegree) - 2 * step);
|
||
|
|
m_exp.CompState[c] = Clamp (v59);
|
||
|
|
}
|
||
|
|
Buffer.BlockCopy (sampleBuf, 0, output, 0, sample_count * 2);
|
||
|
|
}
|
||
|
|
|
||
|
|
static short Clamp (int sample)
|
||
|
|
{
|
||
|
|
if (sample > 0x7FFF)
|
||
|
|
return 0x7FFF;
|
||
|
|
else if (sample < -32768)
|
||
|
|
return -32768;
|
||
|
|
return (short)sample;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ReadHeader (EriFile erif)
|
||
|
|
{
|
||
|
|
var section = erif.ReadSection();
|
||
|
|
if (section.Id != "Header " || section.Length <= 0 || section.Length > int.MaxValue)
|
||
|
|
return null;
|
||
|
|
m_stream_pos = erif.BaseStream.Position + section.Length;
|
||
|
|
section = erif.ReadSection();
|
||
|
|
if (section.Id != "FileHdr" || section.Length < 8)
|
||
|
|
return null;
|
||
|
|
var file_hdr = new byte[section.Length];
|
||
|
|
erif.Read (file_hdr, 0, file_hdr.Length);
|
||
|
|
if (0 == (file_hdr[5] & 1))
|
||
|
|
return null;
|
||
|
|
section = erif.ReadSection();
|
||
|
|
if (section.Id != "SoundInf" || section.Length < 0x24)
|
||
|
|
return null;
|
||
|
|
|
||
|
|
var info = new EmsacSoundInfo();
|
||
|
|
info.Version = erif.ReadInt32();
|
||
|
|
info.Transformation = (CvType)erif.ReadInt32();
|
||
|
|
info.Architecture = (EriCode)erif.ReadInt32();
|
||
|
|
info.ChannelCount = erif.ReadInt32();
|
||
|
|
info.SamplesPerSec = erif.ReadUInt32();
|
||
|
|
info.BlocksetCount = erif.ReadUInt32();
|
||
|
|
info.SubbandDegree = erif.ReadInt32();
|
||
|
|
info.AllSampleCount = erif.ReadInt32();
|
||
|
|
info.LappedDegree = erif.ReadInt32();
|
||
|
|
SetSoundInfo (info);
|
||
|
|
SetWaveFormat (info);
|
||
|
|
|
||
|
|
erif.BaseStream.Position = m_stream_pos;
|
||
|
|
var stream_size = erif.FindSection ("Stream ");
|
||
|
|
m_stream_pos = erif.BaseStream.Position;
|
||
|
|
}
|
||
|
|
|
||
|
|
EmsacExpansion m_exp;
|
||
|
|
int m_lappedSubband;
|
||
|
|
int m_version;
|
||
|
|
EriCode m_field_98;
|
||
|
|
int m_field_9C;
|
||
|
|
int m_field_A0;
|
||
|
|
int m_field_A4;
|
||
|
|
|
||
|
|
void SetSoundInfo (EmsacSoundInfo info)
|
||
|
|
{
|
||
|
|
m_info = info;
|
||
|
|
m_exp = new EmsacExpansion (info);
|
||
|
|
m_version = info.Version;
|
||
|
|
m_field_98 = info.Architecture;
|
||
|
|
m_field_9C = 133;
|
||
|
|
m_field_A0 = -1;
|
||
|
|
m_field_A4 = 0;
|
||
|
|
int subband = 2 << info.SubbandDegree;
|
||
|
|
m_lappedSubband = subband << info.LappedDegree;
|
||
|
|
}
|
||
|
|
|
||
|
|
void SetWaveFormat (EmsacSoundInfo info)
|
||
|
|
{
|
||
|
|
int pcm_bitrate = (int)(m_info.SamplesPerSec * 16 * m_info.ChannelCount);
|
||
|
|
m_format.FormatTag = 1;
|
||
|
|
m_format.Channels = (ushort)ChannelCount;
|
||
|
|
m_format.SamplesPerSecond = m_info.SamplesPerSec;
|
||
|
|
m_format.BitsPerSample = (ushort)BitsPerSample;
|
||
|
|
m_format.BlockAlign = (ushort)(BitsPerSample/8*format.Channels);
|
||
|
|
m_format.AverageBytesPerSecond = (uint)pcm_bitrate/8;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
internal class EmsacExpansion
|
||
|
|
{
|
||
|
|
public int Version; // field_0
|
||
|
|
public CvType Transformation; // field_4
|
||
|
|
public int ChannelCount; // field_8
|
||
|
|
public int SubbandDegree; // field_C
|
||
|
|
public int LappedDegree; // field_10
|
||
|
|
public short[] CompState = new short[16];
|
||
|
|
|
||
|
|
public EmsacExpansion (EmsacSoundInfo info)
|
||
|
|
{
|
||
|
|
Version = info.Version;
|
||
|
|
Transformation = info.Transformation;
|
||
|
|
ChannelCount = info.ChannelCount;
|
||
|
|
SubbandDegree = info.SubbandDegree;
|
||
|
|
LappedDegree = info.LappedDegree;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|