private void AnalyzeWaveform(AudioSampleData[] data, double sampleTime)
{
double lVal = 0, rVal = 0;
double[][] dataWaveform = new double[2][];
dataWaveform[0] = new double[data.Length];
dataWaveform[1] = new double[data.Length];
int i = 0;
for (i = 0; i < data.Length; i++)
{
double absL = Math.Abs(data[i].LVOL);
double absR = Math.Abs(data[i].RVOL);
if (lVal < absL)
{
lVal = absL;
}
if (rVal < absR)
{
rVal = absR;
}
dataWaveform[0][i] = data[i].LVOL;
dataWaveform[1][i] = data[i].RVOL;
if (i % 32 == 0)
{
lock (_vuLock)
{
_vuMeterData = new AudioSampleData(
lVal / _maxLevel,
rVal / _maxLevel);
}
lVal = rVal = 0;
}
}
lock (_waveformLock)
{
_waveformData = dataWaveform;
}
}
void _tmrUpdate_Tick(object sender, EventArgs e)
{
try
{
_tmrUpdate.Stop();
if (ProTONEConfig.SignalAnalisysFunctionActive(SignalAnalisysFunction.VUMeter))
{
AudioSampleData vuData = MediaRenderer.DefaultInstance.VuMeterData;
if (vuData != null)
{
vuLeft.Value = 0.5 * (vuLeft.Value + vuLeft.Maximum * vuData.LVOL);
vuRight.Value = 0.5 * (vuRight.Value + vuRight.Maximum * vuData.RVOL);
}
else
{
vuLeft.Value = 0;
vuRight.Value = 0;
}
}
if (ProTONEConfig.SignalAnalisysFunctionActive(SignalAnalisysFunction.Waveform))
{
gpWaveform.Reset(false);
double[][] waveformData = MediaRenderer.DefaultInstance.WaveformData;
if (waveformData != null && waveformData[0].Length > 0)
{
if (_prevWaveform == null)
{
_prevWaveform = new double[waveformData[0].Length];
}
for (int k = 0; k < _prevWaveform.Length; k++)
{
_prevWaveform[k] = 0.5 * (_prevWaveform[k] + waveformData[0][k]);
}
gpWaveform.MinVal = -1 * MediaRenderer.DefaultInstance.MaxLevel;
gpWaveform.MaxVal = MediaRenderer.DefaultInstance.MaxLevel;
gpWaveform.AddDataRange(_prevWaveform, ThemeManager.GradientGaugeColor1);
}
else
{
gpWaveform.Reset(true);
}
}
if (ProTONEConfig.SignalAnalisysFunctionActive(SignalAnalisysFunction.Spectrogram))
{
double maxFftLevel = SpectrogramTransferFunction(MediaRenderer.DefaultInstance.MaxFFTLevel);
spSpectrogram.Reset(false);
spSpectrogram.MinVal = maxFftLevel / 2; // Min level = -6 dBM
spSpectrogram.MaxVal = maxFftLevel; // Max level = 0 dBM
double[] spectrogramData = MediaRenderer.DefaultInstance.SpectrogramData;
if (spectrogramData != null && spectrogramData.Length > 0)
{
double[] spectrogramData2 = new double[spectrogramData.Length];
Array.Clear(spectrogramData2, 0, spectrogramData.Length);
double[] bands = new double[BandCount];
Array.Clear(bands, 0, BandCount);
int jBand = 0;
int div = spectrogramData.Length / (BandCount);
try
{
int maxSize = (int)Math.Min(BandCount, spectrogramData.Length);
for (int i = 0; i < maxSize; i++)
{
bands[i] = Math.Max(0, Math.Min(maxFftLevel, SpectrogramTransferFunction(spectrogramData[i])));
_bands[i] = 0.5 * (_bands[i] + bands[i]);
}
spSpectrogram.AddDataRange(_bands, Color.Transparent);
}
catch (Exception ex)
{
string s = ex.Message;
spSpectrogram.Reset(true);
Array.Clear(_bands, 0, _bands.Length);
}
}
else
{
spSpectrogram.Reset(true);
Array.Clear(_bands, 0, _bands.Length);
}
}
}
finally
{
_tmrUpdate.Start();
}
}
private void AnalyzeFFT(AudioSampleData[] data)
{
if (data.Length == _fftWindowSize)
{
double[] dataIn = new double[data.Length];
double[] dataOut = new double[data.Length];
for (int i = 0; i < data.Length; i++)
dataIn[i] = data[i].RmsLevel;
FFT.Forward(dataIn, dataOut);
lock (_spectrogramLock)
{
_spectrogramData = dataOut
.Skip(1 /* First band represents the 'total energy' of the signal */ )
.Take(_fftWindowSize / 2 /* The spectrum is 'mirrored' horizontally around the sample rate / 2 according to Nyquist theorem */ )
.ToArray();
}
}
}
private void AnalyzeWaveform(AudioSampleData[] data, double sampleTime)
{
double lVal = 0, rVal = 0;
double[] dataWaveform = new double[data.Length];
int i = 0;
for (i = 0; i < data.Length; i++)
{
double absL = Math.Abs(data[i].LVOL);
double absR = Math.Abs(data[i].RVOL);
if (lVal < absL)
lVal = absL;
if (rVal < absR)
rVal = absR;
dataWaveform[i] = data[i].AvgLevel;
if (i % 32 == 0)
{
lock (_vuLock)
{
_vuMeterData = new AudioSampleData(
lVal / _maxLevel,
rVal / _maxLevel);
}
lVal = rVal = 0;
}
}
lock (_waveformLock)
{
_waveformData = dataWaveform;
}
}
private void ExtractSamples(AudioSample smp)
{
if (smp == null || _actualAudioFormat == null || mediaPosition == null)
{
return;
}
double mediaTime = 0;
mediaPosition.get_CurrentPosition(out mediaTime);
double delay = smp.SampleTime - mediaTime;
double absDelay = Math.Abs(delay);
// Discard samples too far in time from current media time
if (absDelay > 1)
{
return;
}
//CalculateAverageDelay(delay * 1000);
if (delay > 0)
{
Thread.Sleep(TimeSpan.FromSeconds(delay));
}
FilterState ms = GetFilterState();
if (smp.RawSamples.Length <= 0 || ms != FilterState.Running || _actualAudioFormat == null)
{
return;
}
int bytesPerChannel = _actualAudioFormat.wBitsPerSample / 8;
int totalChannels = _actualAudioFormat.nChannels;
int totalChannelsInArray = Math.Min(2, totalChannels);
int i = 0;
while (i < smp.RawSamples.Length)
{
double[] channels = new double[totalChannelsInArray];
Array.Clear(channels, 0, totalChannelsInArray);
int j = 0;
while (j < totalChannelsInArray)
{
int k = 0;
while (k < bytesPerChannel)
{
if (bytesPerChannel <= 2)
{
channels[j] += (short)(smp.RawSamples[i] << (8 * k));
}
else
{
channels[j] += (int)(smp.RawSamples[i] << (8 * k));
}
i++;
k++;
}
j++;
}
if (channels.Length >= 2)
{
_sampleData.Enqueue(new AudioSampleData((double)channels[0], (double)channels[1]));
}
else
{
_sampleData.Enqueue(new AudioSampleData((double)channels[0], 0));
}
_gatheredSamples++;
if (_gatheredSamples % _waveformWindowSize == 0)
{
if (ProTONEConfig.SignalAnalisysFunctionActive(SignalAnalisysFunction.VUMeter) ||
ProTONEConfig.SignalAnalisysFunctionActive(SignalAnalisysFunction.Waveform) ||
ProTONEConfig.SignalAnalisysFunctionActive(SignalAnalisysFunction.WCFInterface))
{
AnalyzeWaveform(_sampleData.Skip(_sampleData.Count - _waveformWindowSize).Take(_waveformWindowSize).ToArray(),
smp.SampleTime);
}
}
Thread.Yield();
}
AudioSampleData lostSample = null;
while (_sampleData.Count > _fftWindowSize)
{
_sampleData.TryDequeue(out lostSample);
}
if (ProTONEConfig.SignalAnalisysFunctionActive(SignalAnalisysFunction.Spectrogram) ||
ProTONEConfig.SignalAnalisysFunctionActive(SignalAnalisysFunction.WCFInterface))
{
AnalyzeFFT(_sampleData.ToArray());
}
Thread.Yield();
}
