xbmc/utils/rfft.h

   1 /*
   2  *  Copyright (C) 2015-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #pragma once
  10
  11 #include <vector>
  12
  13 #include <kissfft/kiss_fftr.h>
  14
  15 //! \brief Class performing a RFFT of interleaved stereo data.
  16 class RFFT
  17 {
  18 public:
  19   //! \brief The constructor creates a RFFT plan.
  20   //! \brief size Length of time data for a single channel.
  21   //! \brief windowed Whether or not to apply a Hann window to data.
  22   RFFT(int size, bool windowed=false);
  23
  24   //! \brief Free the RFFT plan
  25   ~RFFT();
  26
  27   //! \brief Calculate FFTs
  28   //! \param input Input data of size 2*m_size
  29   //! \param output Output data of size m_size.
  30   void calc(const float* input, float* output);
  31 protected:
  32   //! \brief Apply a Hann window to a buffer.
  33   //! \param data Vector with data to apply window to.
  34   static void hann(std::vector<kiss_fft_scalar>& data);
  35
  36   size_t m_size;       //!< Size for a single channel.
  37   bool m_windowed;     //!< Whether or not a Hann window is applied.
  38   kiss_fftr_cfg m_cfg; //!< FFT plan
  39 };