public static Waveform LoadWaveformFromTDMS(string filePath, string waveformName = "", bool normalizeWaveform = true)
{
Waveform waveform = new Waveform();
if (string.IsNullOrEmpty(waveformName))
{
waveformName = Path.GetFileNameWithoutExtension(filePath);
Utilities.FormatWaveformName(ref waveformName);
}
waveform.WaveformName = waveformName;
NIRfsgPlayback.ReadWaveformFromFileComplex(filePath, ref waveform.WaveformData);
NIRfsgPlayback.ReadSignalBandwidthFromFile(filePath, 0, out waveform.SignalBandwidth_Hz);
NIRfsgPlayback.ReadWaveformFileVersionFromFile(filePath, out string waveformVersion);
if (waveformVersion == "1.0.0")
{
NIRfsgPlayback.ReadPeakPowerAdjustmentFromFile(filePath, 0, out waveform.PAPR_dB);
}
else
{
NIRfsgPlayback.ReadPaprFromFile(filePath, 0, out waveform.PAPR_dB); //Version 2.0.0 and later
}
NIRfsgPlayback.ReadBurstStartLocationsFromFile(filePath, 0, ref waveform.BurstStartLocations);
NIRfsgPlayback.ReadBurstStopLocationsFromFile(filePath, 0, ref waveform.BurstStopLocations);
//Statement reads: if NOT BurstStartLocations > 0 AND expression is not null (? operand)
//In other words, manually set BurstStartLocations when the length is 0 or less or array is null
if (!(waveform.BurstStartLocations?.Length > 0))
{
//Set burst start to the first sample(0)
waveform.BurstStartLocations = new int[1] {
0
};
}
if (!(waveform.BurstStopLocations?.Length > 0))
{
//Set burst stop to the last sample (number of samples minus one)
waveform.BurstStopLocations = new int[1] {
waveform.WaveformData.SampleCount - 1
};
}
NIRfsgPlayback.ReadSampleRateFromFile(filePath, 0, out waveform.SampleRate);
waveform.BurstLength_s = CalculateWaveformDuration(waveform.BurstStartLocations, waveform.BurstStopLocations, waveform.SampleRate);
if (normalizeWaveform)
{
NormalizeWaveform(waveform);
}
return(waveform);
}
/// <summary>Loads a waveform and relevant properties from a TDMS file.</summary>
/// <param name="filePath">Specifies the absolute path to the .TDMS waveform file on disk.</param>
/// <param name="waveformName">(Optional) Specifies the name to use to represent the waveform. The file name will be used by default.</param>
/// <returns>The waveform data and associated properties represented in the Waveform type.</returns>
public static Waveform LoadWaveformFromTDMS(string filePath, string waveformName = "")
{
Waveform waveform = new Waveform();
if (string.IsNullOrEmpty(waveformName))
{
waveformName = Path.GetFileNameWithoutExtension(filePath);
waveformName = FormatWaveformName(waveformName);
}
waveform.Name = waveformName;
NIRfsgPlayback.ReadWaveformFromFileComplex(filePath, ref waveform.Data);
NIRfsgPlayback.ReadWaveformFileVersionFromFile(filePath, out string waveformVersion);
if (waveformVersion == "1.0.0")
{
// 1.0.0 waveforms use peak power adjustment = papr + runtime scaling
// we will scale the waveform and calculate papr and runtime scaling manually
float peak = ComplexSingle.GetMagnitudes(waveform.Data.GetRawData()).Max();
waveform.RuntimeScaling = 20.0 * Math.Log10(peak);
NIRfsgPlayback.ReadPeakPowerAdjustmentFromFile(filePath, 0, out double peakPowerAdjustment);
waveform.PAPR_dB = peakPowerAdjustment + waveform.RuntimeScaling;
// scale the waveform to full scale
WritableBuffer <ComplexSingle> waveformBuffer = waveform.Data.GetWritableBuffer();
ComplexSingle scale = ComplexSingle.FromPolar(1.0f / peak, 0.0f);
for (int i = 0; i < waveform.Data.SampleCount; i++)
{
waveformBuffer[i] = waveformBuffer[i] * scale; // multiplication is faster than division
}
}
else
{
NIRfsgPlayback.ReadPaprFromFile(filePath, 0, out waveform.PAPR_dB); //Version 2.0.0 and later
NIRfsgPlayback.ReadRuntimeScalingFromFile(filePath, 0, out waveform.RuntimeScaling);
}
NIRfsgPlayback.ReadSampleRateFromFile(filePath, 0, out waveform.SampleRate);
NIRfsgPlayback.ReadSignalBandwidthFromFile(filePath, 0, out waveform.SignalBandwidth_Hz);
if (waveform.SignalBandwidth_Hz == 0.0)
{
waveform.SignalBandwidth_Hz = 0.8 * waveform.SampleRate;
}
NIRfsgPlayback.ReadBurstStartLocationsFromFile(filePath, 0, ref waveform.BurstStartLocations);
NIRfsgPlayback.ReadBurstStopLocationsFromFile(filePath, 0, ref waveform.BurstStopLocations);
//Statement reads: if NOT BurstStartLocations > 0 AND expression is not null (? operand)
//In other words, manually set BurstStartLocations when the length is 0 or less or array is null
if (!(waveform.BurstStartLocations?.Length > 0))
{
waveform.BurstStartLocations = new int[1] {
0
}
}
; //Set burst start to the first sample(0)
if (!(waveform.BurstStopLocations?.Length > 0))
{
waveform.BurstStopLocations = new int[1] {
waveform.Data.SampleCount - 1
}
}
; //Set burst stop to the last sample (number of samples minus one)
// calculating IdleDurationPresent like this also accounts for tools like wlan sfp that put in burst start and stop locations even if there is no idle time in the waveform
waveform.IdleDurationPresent = waveform.BurstStopLocations.First() - waveform.BurstStartLocations.First() < waveform.Data.SampleCount - 1;
waveform.BurstLength_s = CalculateWaveformDuration(waveform.BurstStartLocations, waveform.BurstStopLocations, waveform.SampleRate);
return(waveform);
}
void LoadWaveforms()
{
//Creates folder selection box
FolderBrowserDialog scriptSelect = new FolderBrowserDialog();
scriptSelect.Description = "All your TDMS are belong to us";
try
{
scriptSelect.ShowDialog();
//tdmsFiles contains the path for all files in the directory selected by the user
string[] tdmsFiles = Directory.GetFiles(scriptSelect.SelectedPath, "*.tdms");
//Foreach loop parses and loads waveform names into lsvWaveforms and RFSGplayback library
List <string> sampleRates = new List <string>();
int wfmsLoaded = 0;
foreach (string tdmsPath in tdmsFiles)
{
//Split file path, find name.
string[] pathComps = tdmsPath.Split('\\', '.');
//If TDMS file extension found
if (pathComps[pathComps.Length - 1] == "tdms")
{
//Try to load wfm into RFSG playback library, read sample rate, and then add name to waveform box
try
{
NIRfsgPlayback.ReadSampleRateFromFile(tdmsPath, 0, out double sampleRate);
sampleRates.Add(sampleRate.ToString());
wfmsLoaded++;
lsvWaveforms.Items.Add(pathComps[pathComps.Length - 2]);
//Adding to list because I don't know how to get items from lsvWaveforms...
tdmsWaveformNames.Add(pathComps[pathComps.Length - 2]);
tdmsFilePaths.Add(tdmsPath);
}
catch (Exception er)
{
//If exception is thrown for invalid TDMS file (error -303804), catch the exception but do nothing
if (er.Message.Contains("Error code: -303804"))
{
//Do nothing
}
//For any other exception, throw it
else
{
throw (er);
}
}
}
}
//Check the number of waveforms loaded
if (wfmsLoaded == 0)
{
throw new FileNotFoundException("No valid TDMS files found in specified directory.");
}
//Check sampleRates for distinct values. If there are more than 1 distinct value, throw exception)
if (sampleRates.Distinct().Count() > 1)
{
throw new Exception("Different sample rates for each file detected. Ensure all TDMS waveforms use same sample rate.");
}
else
{
iqRate = double.Parse(sampleRates[0]);
}
}
catch
{
//Show Error
}
}
