private static int _WriteSignal(ref byte[] data, Signals sigs, double[] avm)
{
if (sigs == null)
{
return(-1);
}
int rhythmStart, rhythmEnd;
sigs.CalculateStartAndEnd(out rhythmStart, out rhythmEnd);
int nrLeads = sigs.NrLeads,
sigs_size = rhythmEnd - rhythmStart,
buff_size = sigs_size * nrLeads * SHORT_SIZE;
if ((sigs_size <= 0) ||
(avm == null) ||
(avm.Length != nrLeads))
{
return(-1);
}
if ((data == null) ||
(data.Length < buff_size))
{
data = new byte[buff_size];
}
for (int pos = 0; pos < buff_size; pos += SHORT_SIZE)
{
int pos2 = pos / SHORT_SIZE,
lead = pos2 % nrLeads,
sample = (pos2 / nrLeads) + rhythmStart;
short curr = LEAD_FAULT_VALUE;
if ((sample >= sigs[lead].RhythmStart) &&
(sample < sigs[lead].RhythmEnd))
{
sample -= sigs[lead].RhythmStart;
if ((sample >= 0) &&
(sample < sigs[lead].Rhythm.Length))
{
curr = sigs[lead].Rhythm[sample];
}
}
if (curr != LEAD_FAULT_VALUE)
{
curr = (short)((curr * sigs.RhythmAVM) / avm[lead]);
}
BytesTool.writeBytes(curr, data, pos, SHORT_SIZE, true);
}
return(buff_size);
}
public int setSignals(Signals sigs)
{
if ((sigs != null) &&
(sigs.NrLeads > 0) &&
(sigs.NrLeads <= ISHNEHeader.MAX_NR_LEADS) &&
(sigs.RhythmAVM > 0.0) &&
(sigs.RhythmSamplesPerSecond > 0))
{
_Header.ECGNrLeads = sigs.NrLeads;
_Header.ECGSampleRate = (Int16)sigs.RhythmSamplesPerSecond;
for (int i = 0; i < sigs.NrLeads; i++)
{
_Header.SetLeadType(i, sigs[i].Type);
_Header.ECGLeadQuality[i] = 0;
_Header.ECGLeadResolution[i] = (Int16)(sigs.RhythmAVM * ISHNEHeader.UV_TO_AMPLITUDE);
}
if (sigs.IsBuffered)
{
BufferedSignals bs = sigs.AsBufferedSignals;
_Header.ECGNrSamples = (bs.RealRhythmEnd - bs.RealRhythmStart) * _Header.ECGNrLeads;
}
else
{
int rhythmStart, rhythmEnd;
sigs.CalculateStartAndEnd(out rhythmStart, out rhythmEnd);
_Header.ECGNrSamples = (rhythmEnd - rhythmStart) * _Header.ECGNrLeads;
}
_Signals = sigs;
return(0);
}
return(1);
}
public override int Write(Stream output)
{
try
{
if ((output != null) &&
output.CanWrite)
{
if (Works())
{
_Header.VarBlockOffset = _Header.Size() + BYTES_BEFORE_HEADER;
_Header.VarBlockSize = (_HeaderAndVarBlock != null) && (_HeaderAndVarBlock.Length < _Header.VarBlockOffset) ? _HeaderAndVarBlock.Length - _Header.VarBlockOffset : 0;
_Header.ECGOffset = _Header.VarBlockOffset + _Header.VarBlockSize;
if ((_HeaderAndVarBlock == null) ||
(_HeaderAndVarBlock.Length < _Header.ECGOffset))
{
_HeaderAndVarBlock = new byte[_Header.ECGOffset];
}
// Begin: code that handles overriding of AVM
double avmOverride = _AVMOverride;
int nrLeads = _Signals.NrLeads;
double[] avm = new double[nrLeads];
if (avmOverride <= 0.0)
{
for (int i = 0; i < nrLeads; i++)
{
avm[i] = _Header.GetLeadAmplitude(i);
}
}
else
{
for (int i = 0; i < nrLeads; i++)
{
_Header.ECGLeadResolution[i] = (Int16)(avmOverride * ISHNEHeader.UV_TO_AMPLITUDE);
avm[i] = avmOverride;
}
}
// End: code that handles overriding of AVM
BytesTool.writeString(MAGIC_NUMBER, _HeaderAndVarBlock, 0, MAGIC_NUMBER.Length);
if (_Header.Write(_HeaderAndVarBlock, BYTES_BEFORE_HEADER, _Header.Size()) != 0)
{
return(0x4);
}
CRCTool tool = new CRCTool();
tool.Init(CRCTool.CRCCode.CRC_CCITT);
ushort crc = tool.CalcCRCITT(_HeaderAndVarBlock, BYTES_BEFORE_HEADER, _HeaderAndVarBlock.Length - BYTES_BEFORE_HEADER);
BytesTool.writeBytes(crc, _HeaderAndVarBlock, MAGIC_NUMBER.Length, SHORT_SIZE, true);
output.Write(_HeaderAndVarBlock, 0, _Header.ECGOffset);
if (_Signals.IsBuffered)
{
BufferedSignals bs = _Signals.AsBufferedSignals;
int rhythmCur = bs.RealRhythmStart,
rhythmEnd = bs.RealRhythmEnd,
stepSize = 60 * bs.RhythmSamplesPerSecond;
byte[] data = null;
for (; rhythmCur < rhythmEnd; rhythmCur += stepSize)
{
if (!bs.LoadSignal(rhythmCur, rhythmCur + stepSize))
{
return(0x8);
}
int buff_size = _WriteSignal(ref data, _Signals, avm);
if (buff_size < 0)
{
return(0x10);
}
output.Write(data, 0, buff_size);
}
}
else
{
int rhythmStart, rhythmEnd;
_Signals.CalculateStartAndEnd(out rhythmStart, out rhythmEnd);
byte[] data = null;
int buff_size = _WriteSignal(ref data, _Signals, avm);
if (buff_size < 0)
{
return(0x10);
}
output.Write(data, 0, buff_size);
}
return(0x0);
}
return(0x2);
}
}
catch
{
return(0x10);
}
return(0x1);
}