anonymous_namespace{FormantShifter.cpp} Namespace Reference

Functions
size_t	ResampleFreqDomain (float *x, size_t fftSize, double factor)

Detailed Description

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Audacity: A Digital Audio Editor

FormantShifter.cpp

Matthieu Hodgkinson

Function Documentation

ResampleFreqDomain()

size_t anonymous_namespace{FormantShifter.cpp}::ResampleFreqDomain	(	float *	x,
		size_t	fftSize,
		double	factor
	)

Definition at line 23 of file FormantShifter.cpp.

{
   const auto size = fftSize / 2 + 1;
   const auto end = std::min(size, size_t(size * factor));
   std::vector<float> tmp(end);
   for (size_t i = 0; i < end; ++i)
   {
      const int int_pos = i / factor;
      const float frac_pos = 1.f * i / factor - int_pos;
      const auto k = MapToPositiveHalfIndex(int_pos, fftSize);
      const auto l = MapToPositiveHalfIndex(int_pos + 1, fftSize);
      tmp[i] = (1 - frac_pos) * x[k] + frac_pos * x[l];
   }
   std::copy(tmp.begin(), tmp.begin() + end, x);
   if (end < size)
      std::fill(x + end, x + size, 0.f);
   return end;
}

References staffpad::vo::copy(), details::end(), MapToPositiveHalfIndex(), min(), and size.

Referenced by FormantShifter::Process().

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