DaisySP_TeensyDaisySP_Teensy/DaisySP/Effects/decimator.h

#pragma once
#ifndef DECIMATOR_H
#define DECIMATOR_H
#include <stdint.h>
#ifdef __cplusplus

namespace daisysp
{
/** Performs downsampling and bitcrush effects
*/
class Decimator
{
  public:
    Decimator() {}
    ~Decimator() {}
    /** Initializes downsample module
    */
    void Init();

    /** Applies downsample and bitcrush effects to input signal.
        \return one sample. This should be called once per sample period. 
    */
    float Process(float input);


    /** Sets amount of downsample 
        Input range: 
    */
    inline void SetDownsampleFactor(float downsample_factor)
    {
        downsample_factor_ = downsample_factor;
    }

    /** Sets amount of bitcrushing 
        Input range: 
    */
    inline void SetBitcrushFactor(float bitcrush_factor)
    {
        //            bitcrush_factor_ = bitcrush_factor;
        bits_to_crush_ = (uint32_t)(bitcrush_factor * kMaxBitsToCrush);
    }

    /** Sets the exact number of bits to crush
        0-16 bits
    */
    inline void SetBitsToCrush(const uint8_t &bits)
    {
        bits_to_crush_ = bits <= kMaxBitsToCrush ? bits : kMaxBitsToCrush;
    }


    /** Returns current setting of downsample
    */
    inline float GetDownsampleFactor() { return downsample_factor_; }
    /** Returns current setting of bitcrush
    */
    inline float GetBitcrushFactor() { return bitcrush_factor_; }

  private:
    const uint8_t kMaxBitsToCrush = 16;
    float         downsample_factor_, bitcrush_factor_;
    uint32_t      bits_to_crush_;
    float         downsampled_, bitcrushed_;
    uint32_t      inc_, threshold_;
};
} // namespace daisysp
#endif
#endif