Waveform.h

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/*

             *
            ***
           *****
   *********************       Mercenaries Engineering SARL
     *****************              Copyright (C) 2018
       *************
         *********        http://www.mercenaries-engineering.com
        ***********
       ****     ****
      **           **

*/
#pragma once

#include <Maquina/UserData.h>
#include <gsl/span>
#include <cmath>

namespace maquina
{

class Waveform : public UserData
{
public:

  virtual StringView type_name() const;
  Waveform(float seconds);
  Waveform(std::vector<int16_t>&& buffer);
  Waveform() = default;

  gsl::span<const int16_t> buffer() const;

  int samples() const;

  static const int sample_rate = 44100;

  static const int channels = 2;

private:
  std::vector<int16_t> _buffer;
};

inline StringView Waveform::type_name() const
{
  return "Waveform";
}

inline Waveform::Waveform(float seconds) : _buffer(int(std::ceil(seconds*float(sample_rate)))*channels, 0) {}

inline Waveform::Waveform(std::vector<int16_t>&& buffer) : _buffer{std::move(buffer)} {}

inline gsl::span<const int16_t> Waveform::buffer() const { return _buffer; }

inline int Waveform::samples() const { return int(_buffer.size())/channels; }

}