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(HcaReader): moved around initialization stuff.

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aimed at implementing async decoder.
This commit is contained in:
morkt 2016-03-03 11:03:35 +04:00
parent ed365530a6
commit dbb3384e02
1 changed files with 66 additions and 40 deletions
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114
ArcFormats/Cri/AudioHCA.cs
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@ -67,18 +67,19 @@ namespace GameRes.Formats.Cri
internal sealed class HcaReader : IDisposable
{
BigEndianReader m_input;
WaveFormat m_format;
uint m_key1;
uint m_key2;
byte[] m_input;
public WaveFormat Format { get { return m_format; } }
public HcaReader (Stream input, uint key1, uint key2)
{
m_input = new BigEndianReader (input, Encoding.UTF8, true);
m_key1 = key1;
m_key2 = key2;
using (var file = new BigEndianReader (input, Encoding.UTF8, true))
ParseHeader (file);
m_ath = new AthTable (m_ath_type.Value, m_format.SamplesPerSecond);
m_cipher = new Cipher (m_ciph_type.Value, key1, key2);
InitBuffer (input);
}
delegate void SampleConverter (float f, BinaryWriter output);
@ -93,7 +94,8 @@ namespace GameRes.Formats.Cri
};
int m_version;
uint m_fmt_block_count;
int m_data_offset;
uint? m_fmt_block_count;
int? m_ciph_type;
int? m_ath_type;
CompParams m_comp;
@ -105,67 +107,90 @@ namespace GameRes.Formats.Cri
public byte[] Unpack (ConversionFormat target)
{
ParseHeader (target);
m_ath = new AthTable (m_ath_type.Value, m_format.SamplesPerSecond);
m_cipher = new Cipher (m_ciph_type.Value, m_key1, m_key2);
InitWaveFormat (target);
m_block = new byte[m_comp.BlockSize];
var output = new byte[m_fmt_block_count * 0x400 * m_format.BlockAlign];
var output = new byte[m_fmt_block_count.Value * 0x400 * m_format.BlockAlign];
using (var mem = new MemoryStream (output))
using (var writer = new BinaryWriter (mem))
Decode (writer, ConversionMap[target]);
return output;
}
void ParseHeader (ConversionFormat target)
void InitWaveFormat (ConversionFormat target)
{
uint signature = ReadSignature();
if (signature != 0x48434100) // 'HCA'
throw new InvalidFormatException();
m_version = m_input.ReadUInt16();
int header_size = m_input.ReadUInt16();
while (m_input.Position < header_size)
{
signature = ReadSignature();
switch (signature)
{
case 0x666D7400: // 'fmt'
uint format = m_input.ReadUInt32();
m_format.FormatTag = (ushort)target;
m_format.Channels = (byte)(format >> 24);
m_format.SamplesPerSecond = format & 0xFFFFFF;
m_format.BitsPerSample = FormatBpsMap[target];
m_format.BlockAlign = (ushort)(m_format.Channels * m_format.BitsPerSample / 8);
m_format.AverageBytesPerSecond = m_format.SamplesPerSecond * m_format.BlockAlign;
m_fmt_block_count = m_input.ReadUInt32();
m_input.Skip (4);
}
void InitBuffer (Stream input)
{
var mem = input as MemoryStream;
if (null == mem)
{
m_input = new byte[input.Length];
input.Position = m_data_offset;
input.Read (m_input, m_data_offset, m_input.Length-m_data_offset);
}
else
{
try
{
m_input = mem.GetBuffer();
}
catch (UnauthorizedAccessException)
{
m_input = mem.ToArray();
}
}
}
void ParseHeader (BigEndianReader input)
{
uint signature = ReadSignature (input);
if (signature != 0x48434100) // 'HCA'
throw new InvalidFormatException();
m_version = input.ReadUInt16();
m_data_offset = input.ReadUInt16();
while (input.Position < m_data_offset)
{
signature = ReadSignature (input);
switch (signature)
{
case 0x666D7400: // 'fmt'
uint format = input.ReadUInt32();
m_format.Channels = (byte)(format >> 24);
m_format.SamplesPerSecond = format & 0xFFFFFF;
m_fmt_block_count = input.ReadUInt32();
input.Skip (4);
continue;
case 0x636F6D70: // 'comp'
m_comp = new CompParams { BlockSize = m_input.ReadUInt16() };
m_input.Read (m_comp.R, 0, 8);
m_input.Skip (2);
m_comp = new CompParams { BlockSize = input.ReadUInt16() };
input.Read (m_comp.R, 0, 8);
input.Skip (2);
continue;
case 0x6C6F6F70: // 'loop'
m_input.Skip (12);
input.Skip (12);
continue;
case 0x63697068: // 'ciph'
m_ciph_type = m_input.ReadUInt16();
m_ciph_type = input.ReadUInt16();
continue;
case 0x72766100: // 'rva'
m_rva_volume = m_input.ReadSingle();
m_rva_volume = input.ReadSingle();
continue;
case 0x61746800: // 'ath'
m_ath_type = m_input.ReadUInt16();
m_ath_type = input.ReadUInt16();
continue;
}
break; // unknown section encountered
}
if (0 == m_format.FormatTag || null == m_comp)
if (null == m_fmt_block_count || null == m_comp)
throw new NotSupportedException ("Not supported HCA format");
if (m_comp.BlockSize < 8)
throw new InvalidFormatException ("Invalid HCA block size");
@ -190,7 +215,6 @@ namespace GameRes.Formats.Cri
if (0 == m_comp.R[2])
m_comp.R[2] = 1;
InitChannels();
m_input.Position = header_size;
}
void InitChannels ()
@ -244,10 +268,13 @@ namespace GameRes.Formats.Cri
void Decode (BinaryWriter output, SampleConverter pack_sample)
{
int bytes_per_sample = m_format.BitsPerSample / 8;
int block_offset = m_data_offset;
for (uint i = 0; i < m_fmt_block_count; ++i)
{
m_input.Read (m_block, 0, m_block.Length);
if (block_offset + m_comp.BlockSize > m_input.Length)
throw new EndOfStreamException();
Buffer.BlockCopy (m_input, block_offset, m_block, 0, m_comp.BlockSize);
block_offset += m_comp.BlockSize;
DecodeBlock();
for (int j = 0; j < 8; ++j)
for (int k = 0; k < 0x80; ++k)
@ -308,12 +335,12 @@ namespace GameRes.Formats.Cri
output.Write ((short)v);
}
uint ReadSignature ()
static uint ReadSignature (BigEndianReader input)
{
return m_input.ReadUInt32() & 0x7F7F7F7F;
return input.ReadUInt32() & 0x7F7F7F7F;
}
ushort CheckSum (byte[] data, ushort sum = 0)
static ushort CheckSum (byte[] data, ushort sum = 0)
{
for (int i = 0; i < data.Length; ++i)
sum = (ushort)((sum << 8) ^ CheckSumTable[(sum >> 8) ^ data[i]]);
@ -955,7 +982,6 @@ namespace GameRes.Formats.Cri
{
if (!_disposed)
{
m_input.Dispose();
_disposed = true;
}
}