stretcher.h

// SPDX-FileCopyrightText: © 2019-2020, 2025 Alexandros Theodotou <alex@zrythm.org>
// SPDX-License-Identifier: LicenseRef-ZrythmLicense
 
#pragma once
 
#include <cstddef>
 
#include "utils/audio.h"
#include "utils/units.h"
 
namespace zrythm::dsp
{

class Stretcher
{
public:
  enum class Backend
  {
    Rubberband,

    Paulstretch,

    SBSMS,
  };

  static std::unique_ptr<Stretcher> create_rubberband (
    units::sample_rate_t samplerate,
    unsigned             channels,
    double               time_ratio,
    double               pitch_ratio,
    bool                 realtime);
 
public:
  ~Stretcher ();
 
  // Delete copy/move until properly implemented
  Stretcher (const Stretcher &) = delete;
  Stretcher &operator= (const Stretcher &) = delete;
  Stretcher (Stretcher &&) = delete;
  Stretcher &operator= (Stretcher &&) = delete;

  signed_frame_t stretch (
    const float * in_samples_l,
    const float * in_samples_r,
    size_t        in_samples_size,
    float *       out_samples_l,
    float *       out_samples_r,
    size_t        out_samples_wanted);

  unsigned int get_latency () const;
 
  void set_time_ratio (double ratio);

  zrythm::utils::audio::AudioBuffer
  stretch_interleaved (zrythm::utils::audio::AudioBuffer &in_samples);
 
private:
  struct Impl;
  std::unique_ptr<Impl> pimpl_;
 
  // Private constructor used by factory method
  Stretcher ();
};
 
} // namespace zrythm::dsp