#include <stdio.h>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <android/log.h>

#define APPNAME "opencvtest jni"
#define LOGD(TAG) __android_log_print(ANDROID_LOG_DEBUG , APPNAME,TAG);

extern "C"
{
int convGray(int height, int width, unsigned char* buffer)
{
    cv::Mat frameMat(height, width, CV_8UC4, (unsigned char*)buffer);
    cv::cvtColor(frameMat, frameMat, CV_RGBA2GRAY);
    cv::cvtColor(frameMat, frameMat, CV_GRAY2RGBA);

    return(1);
}
}