Boolean FFTBufferManager::ComputeFFT(int32_t *outFFTData, float_t *outMajorPitch)
{
if (HasNewAudioData())
{
SpectrumAnalysisProcess(mSpectrumAnalysis, mAudioBuffer, outFFTData, outMajorPitch, true);
OSAtomicDecrement32Barrier(&mHasAudioData);
OSAtomicIncrement32Barrier(&mNeedsAudioData);
mAudioBufferCurrentIndex = 0;
return true;
}
else if (mNeedsAudioData == 0)
OSAtomicIncrement32Barrier(&mNeedsAudioData);
return false;
}
Boolean FFTBufferManager::ComputeFFT(int32_t *outFFTData)
{
if (HasNewAudioData())
{
// for(int i=0;i<mFFTLength;i++)
// {
// if(mAudioBuffer[i]>0.15)
// printf("%f\n",mAudioBuffer[i]);
// }
//Generate a split complex vector from the real data
# define NOISE_FILTER 0.01;
for(int i=0;i<4096;i++)
{
//DENOISE
if(mAudioBuffer[i]>0)
{
mAudioBuffer[i] -= NOISE_FILTER;
if(mAudioBuffer[i] < 0)
{
mAudioBuffer[i] = 0;
}
}
else if(mAudioBuffer[i]<0)
{
mAudioBuffer[i] += NOISE_FILTER;
if(mAudioBuffer[i]>0)
{
mAudioBuffer[i] = 0;
}
}
else
{
mAudioBuffer[i] = 0;
}
}
vDSP_ctoz((COMPLEX *)mAudioBuffer, 2, &mDspSplitComplex, 1, mFFTLength);
//Take the fft and scale appropriately
vDSP_fft_zrip(mSpectrumAnalysis, &mDspSplitComplex, 1, mLog2N, kFFTDirection_Forward);
vDSP_vsmul(mDspSplitComplex.realp, 1, &mFFTNormFactor, mDspSplitComplex.realp, 1, mFFTLength);
vDSP_vsmul(mDspSplitComplex.imagp, 1, &mFFTNormFactor, mDspSplitComplex.imagp, 1, mFFTLength);
//Zero out the nyquist value
mDspSplitComplex.imagp[0] = 0.0;
//Convert the fft data to dB
Float32 tmpData[mFFTLength];
vDSP_zvmags(&mDspSplitComplex, 1, tmpData, 1, mFFTLength);
//In order to avoid taking log10 of zero, an adjusting factor is added in to make the minimum value equal -128dB
vDSP_vsadd(tmpData, 1, &mAdjust0DB, tmpData, 1, mFFTLength);
Float32 one = 1;
vDSP_vdbcon(tmpData, 1, &one, tmpData, 1, mFFTLength, 0);
//Convert floating point data to integer (Q7.24)
vDSP_vsmul(tmpData, 1, &m24BitFracScale, tmpData, 1, mFFTLength);
for(UInt32 i=0; i<mFFTLength; ++i)
outFFTData[i] = (SInt32) tmpData[i];
for(int i=0;i<mFFTLength/4;i++)
{
printf("%i:::%i\n",i,outFFTData[i]/16777216+120);
}
OSAtomicDecrement32Barrier(&mHasAudioData);
OSAtomicIncrement32Barrier(&mNeedsAudioData);
mAudioBufferCurrentIndex = 0;
return true;
}
else if (mNeedsAudioData == 0)
OSAtomicIncrement32Barrier(&mNeedsAudioData);
return false;
}