true_peak_dsp.h

// SPDX-FileCopyrightText: © 2020, 2024 Alexandros Theodotou <alex@zrythm.org>
// SPDX-License-Identifier: LicenseRef-ZrythmLicense OR GPL-2.0-or-later
/*
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright (C) 2013 Robin Gareus <robin@gareus.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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.
 */
 
#pragma once
 
#include <memory>
#include <vector>
 
namespace zrythm::dsp
{
 
class TruePeakDsp
{
public:
  TruePeakDsp ();
  ~TruePeakDsp ();

  void process (float * p, int n);
 
  void process_max (float * p, int n);
 
  float read_f ();

  std::pair<float, float> read ();
 
  void reset ();

  void init (float samplerate);
 
private:
  float              m_ = 0.0f;
  float              p_ = 0.0f;
  float              z1_ = 0.0f;
  float              z2_ = 0.0f;
  bool               res_ = true;
  std::vector<float> buf_;
 
  float w1_ = 0.0f; // attack filter coefficient
  float w2_ = 0.0f; // attack filter coefficient
  float w3_ = 0.0f; // release filter coefficient
  float g_ = 1.0f;  // gain factor
 
  // Forward declared implementation struct to hide zita::Resampler
  struct Impl;
  std::unique_ptr<Impl> impl_;
};
 
} // namespace zrythm::dsp