/**
 * Interpolation functions for resampling audio
 * Copyright (c) 2020 Adam Higerd <chighland@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef TWOSF2WAV_INTERPOLATOR_H
#define TWOSF2WAV_INTERPOLATOR_H

#include <vector>
#include <cstdint>

class IInterpolator
{
public:
  virtual ~IInterpolator() {}

  virtual int32_t interpolate(const std::vector<int32_t>& data, double time) const = 0;

  static IInterpolator* allInterpolators[4];
};

class LinearInterpolator : public IInterpolator
{
public:
  virtual int32_t interpolate(const std::vector<int32_t>& data, double time) const;
};

class CosineInterpolator : public IInterpolator
{
public:
  CosineInterpolator();

  virtual int32_t interpolate(const std::vector<int32_t>& data, double time) const;

private:
  double lut[8192];
};

class SharpIInterpolator : public IInterpolator
{
public:
  virtual int32_t interpolate(const std::vector<int32_t>& data, double time) const;
};


#endif
