private void parseDataRecordStream(StreamReader sr)
{
//set the seek position in the file stream to the beginning of the data records.
sr.BaseStream.Seek((256 + this.Header.NumberOfSignalsInDataRecord * 256), SeekOrigin.Begin);
int dataRecordSize = 0;
foreach (EDFSignal signal in this.Header.Signals)
{
signal.SamplePeriodWithinDataRecord = this.Header.DurationOfDataRecordInSeconds / signal.NumberOfSamplesPerDataRecord;
dataRecordSize += signal.NumberOfSamplesPerDataRecord;
}
byte[] dataRecordBytes = new byte[dataRecordSize * 2];
while (sr.BaseStream.Read(dataRecordBytes, 0, dataRecordSize * 2) > 0)
{
EDFDataRecord dataRecord = new EDFDataRecord();
int j = 0;
int samplesWritten = 0;
foreach (EDFSignal signal in this.Header.Signals)
{
List <float> samples = new List <float>();
for (int l = 0; l < signal.NumberOfSamplesPerDataRecord; l++)
{
float value = (float)(((BitConverter.ToInt16(dataRecordBytes, (samplesWritten * 2)) + (int)signal.Offset)) * signal.AmplifierGain);
samples.Add(value);
samplesWritten++;
}
dataRecord.Add(signal.IndexNumberWithLabel, samples);
j++;
}
_dataRecords.Add(dataRecord);
}
}
/// <summary>
/// 解析数据
/// </summary>
/// <param name="sr"></param>
private void parseDataRecordStream(StreamReader sr)
{
//set the seek position in the file stream to the beginning of the data records.
sr.BaseStream.Seek((256 + this.Header.NumberOfSignalsInDataRecord * 256), SeekOrigin.Begin);
int dataRecordSize = 0;
foreach (EDFSignal signal in this.Header.Signals)
{
signal.SamplePeriodWithinDataRecord = (float)(this.Header.DurationOfDataRecordInSeconds / signal.NumberOfSamplesPerDataRecord);
dataRecordSize += signal.NumberOfSamplesPerDataRecord;
}
byte[] dataRecordBytes = new byte[dataRecordSize * 2];
while (sr.BaseStream.Read(dataRecordBytes, 0, dataRecordSize * 2) > 0)
{
EDFDataRecord dataRecord = new EDFDataRecord();
int j = 0;
int samplesWritten = 0;
foreach (EDFSignal signal in this.Header.Signals)
{
float refVoltage = signal.PhysicalMaximum;
List <float> samples = new List <float>();
for (int l = 0; l < signal.NumberOfSamplesPerDataRecord; l++)
{
// float value = (float)(((BitConverter.ToInt16(dataRecordBytes, (samplesWritten * 2)) + (int)signal.Offset)) * signal.AmplifierGain);
float value = (float)BitConverter.ToInt16(dataRecordBytes, (samplesWritten * 2));
if (this.Header.Version.Equals(NEURO_BOND_FLAG))
{
if (value >= 0 && value <= Math.Pow(2, 19) - 1)
{
value = refVoltage * value / (float)(Math.Pow(2, 19) - 1);
}
else
{
//value = refVoltage * ((value - (float)Math.Pow(2, 20)) / (float)(Math.Pow(2, 19) - 1));
value = refVoltage * value / (float)Math.Pow(2, 19);
}
}
value /= multiplyingPower;
samples.Add(value);
samplesWritten++;
}
dataRecord.Add(signal.IndexNumberWithLabel, samples);
j++;
}
_dataRecords.Add(dataRecord);
}
}
