// 1 oct 22.5Hz to approx. 20000Hz ... 10 variations
public bool Start()
{
m_inputChannelNum = listBoxInput.SelectedIndex;
double startFreq = 22.5;
double endFreq = 20000.0;
int nSamples = SAMPLE_RATE;
System.Diagnostics.Debug.Assert(SAMPLE_RATE <= nSamples);
int nFreq = 0;
for (double f = startFreq; f < endFreq; f *= Math.Pow(2, 1.0 / 3.0))
{
++nFreq;
}
m_seconds = nFreq;
int[] outputData = new int[nFreq * nSamples];
int pos = 0;
for (double f = startFreq; f < endFreq; f *= Math.Pow(2, 1.0 / 3.0))
{
for (int i = 0; i < nSamples; ++i)
{
outputData[pos + i] = 0;
}
for (int i = 0; i < SAMPLE_RATE * (int)numericUpDownPulseCount.Value / f; ++i)
{
outputData[pos + i] = (int)(System.Int32.MaxValue * Math.Sin(2.0 * Math.PI * (i * f / SAMPLE_RATE)));
}
pos += nSamples;
}
foreach (int idx in listBoxOutput.SelectedIndices)
{
asio.OutputSet(idx, outputData, false);
}
asio.InputSet(listBoxInput.SelectedIndex, outputData.Length);
if (0 <= listBoxClockSources.SelectedIndex)
{
asio.ClockSourceSet(listBoxClockSources.SelectedIndex);
}
asio.Start();
progressBar1.Value = 0;
progressBar1.Visible = true;
bw = new BackgroundWorker();
bw.WorkerReportsProgress = true;
bw.DoWork += new DoWorkEventHandler(DoWork);
bw.ProgressChanged += new ProgressChangedEventHandler(ProgressChanged);
bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(RunWorkerCompleted);
bw.RunWorkerAsync();
buttonStop.Enabled = true;
return(true);
}