lv_fourier.h

/* Libvisual - The audio visualisation framework.
 *
 * Copyright (C) 2012      Libvisual team
 *               2004-2006 Dennis Smit
 *
 * Authors: Chong Kai Xiong <kaixiong@codeleft.sg>
 *          Dennis Smit <ds@nerds-incorporated.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef _LV_FOURIER_H
#define _LV_FOURIER_H

#include <libvisual/lv_defines.h>

#ifdef __cplusplus

#include <memory>

namespace LV {

  class LV_API DFT
  {
  public:

      DFT (unsigned int samples_out, unsigned int samples_in);

      DFT (DFT const&) = delete;

      DFT (DFT&& rhs);

      ~DFT ();

      DFT& operator= (DFT const&) = delete;

      DFT& operator= (DFT&& rhs);

      unsigned int get_spectrum_size () const;

      void perform (float *output, float const* input);

      static void log_scale (float* output, float const* input, unsigned int size);

      static void log_scale_standard (float* output, float const* input, unsigned int size);

      static void log_scale_custom (float* output, float const* input, unsigned int size, float log_scale_divisor);

  private:

      class Impl;

      std::unique_ptr<Impl> m_impl;
  };

}  // LV namespace

#endif /* __cplusplus */


/* C API bindings */

#ifdef __cplusplus
typedef ::LV::DFT VisDFT;
#else
typedef struct _VisDFT VisDFT;
struct _VisDFT;
#endif

LV_BEGIN_DECLS

LV_API VisDFT *visual_dft_new  (unsigned int samples_out, unsigned int samples_in);
LV_API void    visual_dft_free (VisDFT *dft);

LV_API void visual_dft_perform (VisDFT *dft, float *output, float const *input);

LV_API void visual_dft_log_scale (float *output, float const *input, unsigned int size);
LV_API void visual_dft_log_scale_standard (float *output, float const *input, unsigned int size);
LV_API void visual_dft_log_scale_custom (float *output, float const *input, unsigned int size, float log_scale_divisor);

LV_END_DECLS

#endif /* _LV_FOURIER_H */