LookAheadGainReduction.h

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/*
 This file is part of the SimpleCompressor project.
 https://github.com/DanielRudrich/SimpleCompressor
 Copyright (c) 2019 Daniel Rudrich
 
 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, version 3.
 
 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/>.
 */
 
 
#pragma once
#include <vector>
 
namespace DanielRudrich {
class LookAheadGainReduction
{
public:
    LookAheadGainReduction() : sampleRate (0.0) {}
    ~LookAheadGainReduction() {}
 
    void setDelayTime (float delayTimeInSeconds);
 
    const int getDelayInSamples() { return delayInSamples; }
 
    void prepare (const double sampleRate, const int blockSize);
 
    void pushSamples (const float* src, const int numSamples);
 
    void process();
 
    void readSamples (float* dest, const int numSamples);
 
 
private:
    inline void getProcessPositions (int startIndex, int numSamples, int& blockSize1, int& blockSize2);
 
    inline void getWritePositions (int numSamples, int& startIndex, int& blockSize1, int& blockSize2);
 
    inline void getReadPositions (int numSamples, int& startIndex, int& blockSize1, int& blockSize2);
 
 
private:
    //==============================================================================
    double sampleRate;
    int blockSize;
 
    float delay;
    int delayInSamples = 0;
    int writePosition = 0;
    int lastPushedSamples = 0;
    std::vector<float> buffer;
};
} // namespace DanielRudrich