private void RenderFFTScan(short[] samples)
{
Dispatcher.BeginInvoke(() =>
{
var height = (int)outputImage.Height;
// var width = (int)outputImage.Width;
byte[] frequencyPeaks = PeakMeter.CalculateFrequencies(samples, AudioFormat.Default.SamplesPerSecond);
if (_fftScanIsCleared)
{
ClearOutputBitmap();
_xRunningScanCounter = marginLeft;
_fftScanIsCleared = false;
}
int bandTotal = frequencyPeaks.Length;
bool isAlternateColour = false;
// Clear previous scan line
_outputWriteableBitmap.DrawLine(_xRunningScanCounter, 0, _xRunningScanCounter, height, _clearColour);
for (int x = 0; x < bandTotal; x++)
{
int maximumPeak = (frequencyPeaks[x] >> 1);
int baseOffsetY = ((bandTotal - x) * 39);
_maximumPeaks[x] = ((_maximumPeaks[x] + maximumPeak) >> 1);
int offsetY = (baseOffsetY - _maximumPeaks[x]);
int drawingColour = isAlternateColour ? _alternatePrimaryColour : _primaryColour;
isAlternateColour = !(isAlternateColour);
if (offsetY == baseOffsetY)
{
_outputWriteableBitmap.SetPixel(_xRunningScanCounter, baseOffsetY, drawingColour);
}
else
{
_outputWriteableBitmap.DrawLine(_xRunningScanCounter, offsetY, _xRunningScanCounter, baseOffsetY, drawingColour);
}
}
// Current Scanline
_outputWriteableBitmap.DrawLine((_xRunningScanCounter + 1), 0, (_xRunningScanCounter + 1), height, _secondaryColour);
_xRunningScanCounter++;
if (_xRunningScanCounter >= _widthWithoutMarginRight)
{
_outputWriteableBitmap.DrawLine(_xRunningScanCounter, 0, _xRunningScanCounter, height, _clearColour);
_xRunningScanCounter = marginLeft;
}
FlushOutputBitmap();
});
}
private void RenderPeakMeter(short[] samples)
{
Dispatcher.BeginInvoke(() =>
{
int barSpacing = 25;
int barWidth = (barSpacing - 8);
int lineWidth = (barWidth + 1);
int leftOffset = 60;
byte[] frequencyPeaks = PeakMeter.CalculateFrequencies(samples, AudioFormat.Default.SamplesPerSecond);
if (!(_clearEffectIsEnabled))
{
ClearOutputBitmap();
}
const int baseY = 255;
for (int x = 0; x < frequencyPeaks.Length; x++)
{
int offsetX = (x * barSpacing) + leftOffset;
int offsetY = Convert.ToInt32(Math.Max(baseY - (frequencyPeaks[x] * VolumeFactor), 0));
// offsetY = baseY - frequencyPeaks[x];
_lastPeaks[x] = CalculatePeakDelay(_lastPeaks[x], offsetY, 4, baseY);
_maximumPeaks[x] = CalculatePeakDelay(_maximumPeaks[x], offsetY, 2, baseY);
_outputWriteableBitmap.DrawFilledRectangle(offsetX, _lastPeaks[x], (offsetX + barWidth), baseY, _primaryColour);
// Only draw the maximum peak if it is above the empty bar level (cutoff)
if (_lastPeaks[x] < baseY)
{
_outputWriteableBitmap.DrawLine(offsetX, _maximumPeaks[x], (offsetX + lineWidth), _maximumPeaks[x], _secondaryColour);
}
}
if (_clearEffectIsEnabled)
{
RunClearEffect();
}
FlushOutputBitmap();
});
}
