RV1126，根据SDK中rkmedia_vi_rknn_venc_rtsp_test.c上nv12_to_rgb中的参数，换成rknn提供的rga库进行格式转换和缩放，获取句柄一直报错

nv12_to_rgb24((unsigned char*)RK_MPI_MB_GetPtr(buffer), rga_buffer,
              cfg.session_cfg[RK_NN_INDEX].u32Width,
              cfg.session_cfg[RK_NN_INDEX].u32Height);

这是我改用rga库所用的代码
src_width = image.cols;
src_height = image.rows;
src_format = RK_FORMAT_YCbCr_420_SP;

dst_width = image.cols;
dst_height = image.rows;
dst_format = RK_FORMAT_BGR_888;
cout << " src format: " << get_bpp_from_format(src_format) << endl;
cout << " dst format: " << get_bpp_from_format(dst_format) << endl;

src_buf_size = src_width * src_height * get_bpp_from_format(src_format);
dst_buf_size = dst_width * dst_height * get_bpp_from_format(dst_format);

src_buf = (char *)malloc(src_buf_size);
dst_buf = (char *)malloc(dst_buf_size);

memcpy(src_buf, image.data, src_width * src_height * get_bpp_from_format(src_format));

memset(dst_buf, 0x80, dst_buf_size);

src_handle = importbuffer_virtualaddr(src_buf, src_buf_size);
dst_handle = importbuffer_virtualaddr(dst_buf, dst_buf_size);

在此处返回的句柄全为0