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(MioDecoder.DecodeSoundPCM16): use unsafe block to pack 16-bit samples into byte array.

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This commit is contained in:
morkt 2015-11-07 14:40:40 +04:00
parent 4543d06841
commit a44c9b15a5
1 changed files with 25 additions and 15 deletions
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28
ArcFormats/Entis/MioDecoder.cs
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@ -219,18 +219,21 @@ namespace GameRes.Formats.Entis
uint nSampleCount = datahdr.SampleCount;
uint nChannelCount = (uint)m_mioih.ChannelCount;
uint nAllSampleCount = nSampleCount * nChannelCount;
uint nBytes = nAllSampleCount * sizeof(short);
if (ptrWaveBuf.Length < wave_pos + (int)nBytes)
return false;
if (nSampleCount > m_nBufLength)
{
m_ptrBuffer3 = new sbyte[nAllSampleCount * sizeof(short)];
m_ptrBuffer4 = new byte[nAllSampleCount * sizeof(short)];
m_ptrBuffer3 = new sbyte[nBytes];
m_ptrBuffer4 = new byte[nBytes];
m_nBufLength = nSampleCount;
}
if (0 != (datahdr.Flags & MIO_LEAD_BLOCK))
{
(context as HuffmanDecodeContext).PrepareToDecodeERINACode();
}
uint nBytes = nAllSampleCount * sizeof(short);
if (context.DecodeBytes (m_ptrBuffer3, nBytes) < nBytes)
{
return false;
@ -251,22 +254,29 @@ namespace GameRes.Formats.Entis
m_ptrBuffer4[pbytDstBuf + j * sizeof(short) + 1] = (byte)(bytHigh ^ (bytLow >> 7));
}
}
int ptrSrcBuf = 0; // (SWORD*) m_ptrBuffer4;
int nStep = m_mioih.ChannelCount*sizeof(short);
if (m_ptrBuffer4.Length < nBytes)
return false;
unsafe
{
fixed (byte* rawBuffer4 = m_ptrBuffer4, rawWaveBuf = &ptrWaveBuf[wave_pos])
{
int nStep = m_mioih.ChannelCount;
short* ptrSrcBuf = (short*)rawBuffer4;
for (int i = 0; i < m_mioih.ChannelCount; i++)
{
int ptrDstBuf = wave_pos + i*sizeof(short); // (SWORD*) ptrWaveBuf;
short* ptrDstBuf = (short*)rawWaveBuf + i; // (SWORD*) ptrWaveBuf;
short wValue = 0;
short wDelta = 0;
for (uint j = 0; j < nSampleCount; j++)
{
wDelta += LittleEndian.ToInt16 (m_ptrBuffer4, ptrSrcBuf);
wDelta += *ptrSrcBuf++;
wValue += wDelta;
LittleEndian.Pack (wValue, ptrWaveBuf, ptrDstBuf); // *ptrDstBuf = wValue;
ptrSrcBuf += sizeof(short);
*ptrDstBuf = wValue;
ptrDstBuf += nStep;
}
}
}
}
return true;
}