ring_buffer.h

/*
 * Copyright (C) 2021-2023 Liu An Lin <liuanlin-mx@qq.com>
 * 
 * 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
 */


#ifndef __RING_BUFFER_H__
#define __RING_BUFFER_H__

struct ring_buffer
{
public:
    explicit ring_buffer(unsigned int sample_rate);
    ~ring_buffer();
    
private:
    ring_buffer(const ring_buffer&);
    ring_buffer& operator=(const ring_buffer&);
    
public:
    static unsigned int get_size_from_rate(unsigned int sample_rate)
    {
        return (sample_rate >= 88200)? 4096: 2048;
    }
    
public:
    inline void put(float v)
    {
        _buf_i[_idx] = v;
        if (++_idx >= _buf_size)
        {
            _idx = 0;
        }
    }
    
    inline float& operator[] (unsigned int idx)
    {
        return _buf_i[idx];
    }
    
    inline unsigned int get_idx()
    {
        return _idx;
    }
    
    inline float current() const
    {
        return _buf_i[_idx];
    }
    
    inline unsigned int get_buf_size()
    {
        return _buf_size;
    }
    
    inline unsigned int get_corr_size()
    {
        return _corr_size;
    }
    
private:
    unsigned int _buf_size;    // size of circular buffer
    unsigned int _corr_size;   // _buf_size / 2 + 1
    unsigned int _idx;         //write pointer;
    float* _buf_i;
    //float* _buf_f;              // circular formant correction buffer
};

#endif