// catch the peak overload event triggered by VuMeter
public void CatchPeakOverloadEvent(VuMeter ob_VuMeter, PeakOverload ob_PeakOverload)
{
if (ob_PeakOverload.Channel == 1)
{
txtOverloadLeft.Text = ob_VuMeter.m_MeanValueLeft.ToString();
}
if (ob_PeakOverload.Channel == 2)
{
txtOverloadRight.Text = ob_VuMeter.m_MeanValueRight.ToString();
}
BeepEnabled = true;
}
void AnimationComputation()
{
//Thread.Sleep (25) ;
// finds the origin i.e upper left corner of graph display rectangle
//origin is computed from centre position of graph
int OriginX = m_GraphPositionX - Convert.ToInt32((m_ScaleFactor * 60));
int OriginY = m_GraphPositionY - Convert.ToInt32(125 * m_ScaleFactor);
// create an local array and fill the amplitude value of both channels from function
int [] AmpArray = new int [2];
Array.Copy(AmplitudeValue(), AmpArray, 2);
// feed the amplitude in sampple array for computing mean value
SampleArrayLeft [m_SampleArrayPosition] = AmpArray [0];
SampleArrayRight [m_SampleArrayPosition] = AmpArray [1];
m_SampleArrayPosition++;
if (m_SampleArrayPosition >= m_SampleCount)
{
m_SampleArrayPosition = 0;
}
// Find Mean Values of Left and Right Channels
m_MeanValueLeft = m_MeanValueRight = 0;
for (int i = 0; i < m_SampleCount; i++)
{
m_MeanValueLeft = m_MeanValueLeft + SampleArrayLeft [i];
m_MeanValueRight = m_MeanValueRight + SampleArrayRight [i];
}
m_MeanValueLeft = m_MeanValueLeft / m_SampleCount;
m_MeanValueRight = m_MeanValueRight / m_SampleCount;
// update peak values if it is greater than previous value
if (m_PeakValueLeft < m_MeanValueLeft)
{
arPeakOverloadValue[0] = m_PeakValueLeft = m_MeanValueLeft;
}
if (m_PeakValueRight < m_MeanValueRight)
{
arPeakOverloadValue[1] = m_PeakValueRight = m_MeanValueRight;
}
// Check for Peak Overload and fire event if overloaded
if (m_MeanValueLeft > m_UpperThreshold)
{
arPeakOverloadFlag [0] = true;
PeakOverload ob_PeakOverload = new PeakOverload(1, ob_AudioPlayer.GetCurrentBytePosition(), ob_AudioPlayer.GetCurrentTimePosition());
ob_PeakOverload.PeakOverloadEvent += new DPeakOverloadEvent(ob_VuMeterForm.CatchPeakOverloadEvent);
ob_PeakOverload.NotifyPeakOverload(this, ob_PeakOverload);
}
else
{
arPeakOverloadFlag [0] = false;
}
if (m_MeanValueRight > m_UpperThreshold)
{
m_bOverload = true;
arPeakOverloadFlag [1] = true;
PeakOverload ob_PeakOverload = new PeakOverload(2, ob_AudioPlayer.GetCurrentBytePosition(), ob_AudioPlayer.GetCurrentTimePosition());
ob_PeakOverload.PeakOverloadEvent += new DPeakOverloadEvent(ob_VuMeterForm.CatchPeakOverloadEvent);
ob_PeakOverload.NotifyPeakOverload(this, ob_PeakOverload);
}
else
{
arPeakOverloadFlag [1] = false;
}
// compute the cordinates of graph and animation
DisplayGraph();
int ThresholdFactor = 12500 / (m_UpperThreshold - m_LowerThreshold);
int DisplayAmpLeft = (m_MeanValueLeft * ThresholdFactor) / 100;
int DisplayAmpRight = (m_MeanValueRight * ThresholdFactor) / 100;
int Offset = 65 - ((m_LowerThreshold * ThresholdFactor) / 100);
DisplayAmpLeft = DisplayAmpLeft + Offset;
DisplayAmpRight = DisplayAmpRight + Offset;
Graph.EraserLeft = OriginY + Convert.ToInt32(m_ScaleFactor * (254 - DisplayAmpLeft));
Graph.EraserRight = OriginY + Convert.ToInt32(m_ScaleFactor * (254 - DisplayAmpRight));
//Thread.Sleep (25) ;
// Update ccurrent graph cordinates to VuMeter display
ob_UpdateForms.NotifyUpdateForms(this, ob_UpdateForms);
}
