OpenCV in Android, setup an image from a Bitmap pixel buffer, converting

JNIEXPORT void JNICALL Java_com_convert(JNIEnv *env,
                                        jobject thiz,
                                        jobject bitmap) {
    const int width = 2592; // You can also get them through JNI
    const int height = 1952;
    IplImage* image = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 2);
    cvInitImageHeader(image,
                      cvSize(width, height),
                      IPL_DEPTH_8U, 2, IPL_ORIGIN_BL, 4);
    int *cv_data;
    AndroidBitmap_lockPixels(env, bitmap, (void**)&cv_data);
    cvSetData(image, cv_data, width * 2);
    IplImage* grey_img = cvCreateImage(cvGetSize(image), IPL_DEPTH_8U, 1);
    cvCvtColor(image, grey_img, CV_BGR5652GRAY);
    cvSetData(image, NULL, 0);


    image = grey_img;
    DO_WHAT_YOU_WANT_WITH_YOUR_IMAGE(&image);


    AndroidBitmap_unlockPixels(env, bitmap);
}