#include"ac.h"

extern "C" void filter(cv::Mat  &frame) {
    static constexpr int MAX = 16;
    static ac::MatrixCollection<MAX> collection;
    
    if(collection.empty()) {
        collection.shiftFrames(frame);
        srand(static_cast<unsigned int>(time(0)));
    } else if(rand()%2 == 0)
        collection.shiftFrames(frame);
    
    static int off = 0;
    cv::Mat &f = collection.frames[off];
    frame = f.clone();
    static int dir = 1;
    if(dir == 1) {
        if(++off > MAX-1) {
            off = MAX-1;
            dir = 0;
        }
    } else {
        if(--off <= 0) {
            off = 0;
            dir = 1;
        }
    }
}