Video delay for openFrameworks.

FixedVideoDelay.h

#pragma once

#include <vector>
#include "ofImage.h"

class FixedVideoDelay {
private:
    int delayAmount;
    int totalFrames;
    int readPosition;
    int writePosition;
    std::vector<ofPixels> buffer;

public:
    FixedVideoDelay() {}
    void setup(int width, int height, int delayAmount) {
        this->delayAmount = delayAmount;
        int bufferSize = delayAmount * 2;
        for (int i = 0; i < bufferSize; i++) {
            ofPixels pix;
            pix.allocate(width, height, OF_IMAGE_COLOR);
            buffer.push_back(pix);
        }
        totalFrames = 0;
        readPosition = 0;
        writePosition = 0;
    }

    void writeFrame(ofPixels &pixels) {
        buffer[writePosition] = pixels;
        writePosition = (writePosition + 1) % buffer.size();
        totalFrames++;
    }

    bool ready() {
        return totalFrames >= delayAmount;
    }

    ofPixels &readFrame() {
        readPosition = (readPosition + 1) % buffer.size();
        return buffer[readPosition];
    }
};