OPENCV 将NV21数据转成jpg

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int nv21_2_jpeg(char *jpg_file_addr, char *nv21_addr, int nv21_width, int nv21_height)
{
	if(!jpg_file_addr || !nv21_addr || nv21_width <= 0 || nv21_height <= 0)
		return -1;

	cv::Mat image_nv21(nv21_height + nv21_height / 2, nv21_width, CV_8UC1, (unsigned char *)nv21_addr);
	cv::Mat image_bgr;
	cvtColor(image_nv21, image_bgr, cv::COLOR_YUV2BGR_NV21);
	if(image_bgr.empty())
	{
		printf("image_bgr empty n");
		return -1;
	}

	std::vector<uchar> data_encode;
	std::vector<int> param = std::vector<int>(2);
	param[0] = CV_IMWRITE_JPEG_QUALITY;
	param[1] = 95;
	imencode(".jpg", image_bgr, data_encode, param);
	
	memcpy(jpg_file_addr,&*data_encode.begin(),data_encode.size());

	return data_encode.size();
}