private void CalculateTimeLength(WavHeader WavHeader)
{
int BPS = WavHeader.SampleRate * WavHeader.Channels * WavHeader.BlockAlign;
_timeLength = (WavHeader.DataSize / BPS) * 1000;
}
private void DivideEachChannel(WavHeader WavHeader, byte[] waveRawData)
{
if (WavHeader.BitDepth < 16 && WavHeader.BitDepth > 32)
{
throw new ArgumentOutOfRangeException();
}
int bytePerChannel = WavHeader.DataSize / WavHeader.Channels;
int dataLengthPerCH = bytePerChannel / (WavHeader.BitDepth / 8);
_waveData = new double[WavHeader.Channels, dataLengthPerCH];
int index;
Int16 LowByte16;
Int16 HighByte16;
Int32 LowByte;
Int32 MidByte;
Int32 HighByte;
Int32 LLByte32;
Int32 MLByte32;
Int32 MHByte32;
Int32 HHByte32;
switch (WavHeader.BitDepth)
{
case 16:
for (_channelOrder = 0; _channelOrder < WavHeader.Channels; _channelOrder++)
{
index = 0;
for (int byteCnt = _channelOrder * 2; byteCnt < _wavRawData.Length; byteCnt += WavHeader.BlockAlign)
{
LowByte16 = _wavRawData[byteCnt];
HighByte16 = (Int16)(_wavRawData[byteCnt + 1] << 8);
_waveData[_channelOrder, index] = (HighByte16 | LowByte16);
_waveData[_channelOrder, index] /= 0x8000; // Normalize
index++;
}
}
break;
case 24:
for (_channelOrder = 0; _channelOrder < WavHeader.Channels; _channelOrder++)
{
index = 0;
for (int byteCnt = _channelOrder * 3; byteCnt < _wavRawData.Length; byteCnt += WavHeader.BlockAlign)
{
LowByte = _wavRawData[byteCnt];
MidByte = _wavRawData[byteCnt + 1] << 8;
HighByte = _wavRawData[byteCnt + 2] << 16;
_waveData[_channelOrder, index] = (HighByte | MidByte | LowByte);
if (_waveData[_channelOrder, index] > 0x800000) // Sign check
{
_waveData[_channelOrder, index] -= 0x1000000;
}
_waveData[_channelOrder, index] /= 0x800000; // Normalize
index++;
}
}
break;
case 32: // experimental
for (_channelOrder = 0; _channelOrder < WavHeader.Channels; _channelOrder++)
{
index = 0;
for (int byteCnt = _channelOrder * 4; byteCnt < _wavRawData.Length; byteCnt += WavHeader.BlockAlign)
{
LLByte32 = _wavRawData[byteCnt];
MLByte32 = _wavRawData[byteCnt + 1] << 8;
MHByte32 = _wavRawData[byteCnt + 2] << 16;
HHByte32 = _wavRawData[byteCnt + 3] << 24;
_waveData[_channelOrder, index] = (HHByte32 | MHByte32 | MLByte32 | LLByte32);
//_waveData[_channelOrder, index] /= 0x80000000; // Normalize
index++;
}
}
break;
default:
throw new InvalidDataException();
}
}