private void ComputeDo3Band(byte[] pkgData, long lBytesToWrite, WAVEFORMATEXTENSION _waveFormat)
{
if (GetAudioData(pkgData, lBytesToWrite, _waveFormat))
{
EQSTATE eqs = new EQSTATE();
AudioBandsConfig.init_3band_state(eqs, LowFrequence, HighFrequence, (int)_waveFormat.NSamplesPerSec);
//for (int i = 0; i < m_nNumSamples; i++)
for (int i = 0; i < m_RealIn_RT.Count; i++)
{
m_Band_arr.Add(AudioBandsConfig.do_3band(eqs, m_RealIn_RT[i]));
m_BandLow_arr.Add(AudioBandsConfig.do_3bandLow(eqs, m_RealIn_LT[i]));
}
double A2, dSum = 0, A2Low, dSumLow = 0;
for (int i = 0; i < m_Band_arr.Count; i++)
{
A2 = m_Band_arr[i] * m_Band_arr[i];
dSum += A2;
A2Low = m_BandLow_arr[i] * m_BandLow_arr[i];
dSumLow += A2Low;
}
double dAvg = dSum / m_nNumSamples;
double dAvgLow = dSumLow / m_nNumSamples;
double dFinal = Math.Sqrt(dAvg);
double dFinalLow = Math.Sqrt(dAvgLow);
double dOutput = dFinal * Math.Sqrt(2) / 32768 * 100;
double dOutputLow = dFinalLow * Math.Sqrt(2) / 32768 * 100;
_audiopluseCallBack(dOutput, dOutputLow);
}
}
private bool GetAudioData(byte[] pkgData, long lBytesToWrite, WAVEFORMATEXTENSION waveFormat)
{
const double FFT_SPEED = 0.006;
var m_nBufferSize = AudioBandsConfig.NextPowerOfTwo((int)(waveFormat.NAvgBytesPerSec * FFT_SPEED));
m_nNumSamples = m_nBufferSize / waveFormat.NBlockAlign;
//m_RealIn_RT.Clear();
//m_RealIn_LT.Clear();
//m_Band_arr.Clear();
//m_BandLow_arr.Clear();
switch (waveFormat.WBitsPerSample)
{
case 8:
break;
case 16:
if (waveFormat.NChannels == 1) // mono
{
int Samples = m_nNumSamples >> 1;
for (int i = 0; i < Samples; ++i)
{
m_RealIn_RT[i] = (float)(pkgData[i]);
m_RealIn_LT[i] = m_RealIn_RT[i];
}
m_nNumSamples = Samples;
}
//else if (waveFormat.NChannels == 2) // stereo
else
{
// Stereo has Left+Right channels
int Samples = m_nNumSamples >> 2;
//for (int i = 0, j = 0; i < Samples; ++i, j += 2)
for (int i = 0, j = 0; i < pkgData.Length; ++i, j += 2)
{
if (j >= pkgData.Length)
{
continue;
}
if (pkgData[j] == 0)
{
m_RealIn_RT.Add(0);
if (pkgData[j + 1] == 0)
{
m_RealIn_LT.Add(0);
}
else if (pkgData[j + 1] != 0)
{
m_RealIn_LT.Add((float)(pkgData[j + 1]));
}
}
else
{
m_RealIn_RT.Add((float)(pkgData[j]));
m_RealIn_LT.Add((float)(pkgData[j + 1]));
}
m_nNumSamples = Samples;
}
}
break;
}
return(true);
}
