protected void SampleAnalyzerLoop()
{
while (sampleAnalyzerMustStop.WaitOne(0) == false)
{
if (ProTONEConfig.IsSignalAnalisysActive())
{
AudioSample smp = null;
if (samples.TryDequeue(out smp) && smp != null)
{
ExtractSamples(smp);
}
Thread.Yield();
}
else
{
Thread.Sleep(1);
}
}
}
// ISampleGrabberCB Members
public int BufferCB(double sampleTime, IntPtr pBuffer, int bufferLen)
{
if (ProTONEConfig.IsSignalAnalisysActive())
{
try
{
if (sampleGrabberConfigured.WaitOne(0) && _actualAudioFormat != null)
{
const int fraction = 128;
byte[] allBytes = new byte[bufferLen];
Marshal.Copy(pBuffer, allBytes, 0, bufferLen);
int pos = 0;
double chunkTimeLen = (double)fraction / (double)_actualAudioFormat.nSamplesPerSec;
int chunkSize = fraction * _actualAudioFormat.nBlockAlign;
int i = 0;
do
{
int size = Math.Min(chunkSize, bufferLen - pos);
AudioSample smp = new AudioSample();
smp.RawSamples = new byte[size];
smp.SampleTime = sampleTime + i * chunkTimeLen;
Array.Copy(allBytes, pos, smp.RawSamples, 0, size);
samples.Enqueue(smp);
pos += size;
i++;
}while (pos < bufferLen);
}
}
catch { }
}
return(0);
}
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;
// Sync the sample.
// Use extended sleep since Thread.Sleep is too low-resolution.
//ThreadScheduler.SleepEx(delay);
if (delay > 0 && delay < 1)
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))
{
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))
{
AnalyzeFFT(_sampleData.ToArray());
}
Thread.Yield();
}
// ISampleGrabberCB Members
public int BufferCB(double sampleTime, IntPtr pBuffer, int bufferLen)
{
if (ProTONEConfig.IsSignalAnalisysActive())
{
try
{
if (sampleGrabberConfigured.WaitOne(0) && _actualAudioFormat != null)
{
const int fraction = 128;
byte[] allBytes = new byte[bufferLen];
Marshal.Copy(pBuffer, allBytes, 0, bufferLen);
int pos = 0;
double chunkTimeLen = (double)fraction / (double)_actualAudioFormat.nSamplesPerSec;
int chunkSize = fraction * _actualAudioFormat.nBlockAlign;
int i = 0;
do
{
int size = Math.Min(chunkSize, bufferLen - pos);
AudioSample smp = new AudioSample();
smp.RawSamples = new byte[size];
smp.SampleTime = sampleTime + i * chunkTimeLen;
Array.Copy(allBytes, pos, smp.RawSamples, 0, size);
samples.Enqueue(smp);
pos += size;
i++;
}
while (pos < bufferLen);
}
}
catch { }
}
return 0;
}
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();
}