Spectrogram::Spectrogram(FramesCollection& frames):
m_frameCount(frames.count()),
m_spectrumSize(frames.getSamplesPerFrame()),
m_fft(FftFactory::getFft(m_spectrumSize)),
m_data(new SpectrogramDataType(m_frameCount))
{
std::size_t i = 0;
for (auto it = frames.begin(); it != frames.end(); ++it, ++i)
{
(*m_data)[i] = m_fft->fft(it->toArray());
}
}
Spectrogram::Spectrogram(FramesCollection& frames):
m_frameCount(frames.count()),
m_spectrumSize(frames.getSamplesPerFrame()),
// the following line converts an auto_ptr<Fft> returned by getFft
// to a shared_ptr<Fft> stored in m_fft class member
m_fft(FftFactory::getFft(m_spectrumSize).release()),
m_data(new SpectrogramDataType(m_frameCount))
{
std::size_t i = 0;
ComplexType* spectrumArray = new ComplexType[m_spectrumSize];
for (FramesCollection::iterator iFrame = frames.begin(); iFrame != frames.end(); ++iFrame, ++i)
{
// a reference to ease typing
SpectrumType& frameSpectrum = (*m_data)[i];
std::memset(spectrumArray, 0, m_spectrumSize * sizeof(ComplexType));
m_fft->fft(iFrame->toArray(), spectrumArray);
frameSpectrum.assign(spectrumArray, spectrumArray + m_spectrumSize);
}
delete [] spectrumArray;
}