Dear supporter,
This question have confused me several days . I want to get the image data from GstBuffer after recognized. I have reference the function of gst_yoloplugin_transform_ip() and get_converted_mat().
My plotform is on TX2 deepstream 1.5 ,using gst-yoloplugin-tegra.
I added below code at the last function of attach_metadata_full_frame.
The recognized bbox have attached to GstBuffer(inbuf) by function gst_buffer_add_iva_meta_full,right?
It will have Segmentation fault error using below code,can you give me some suggeations for it.
My code:
dsmeta = gst_buffer_add_nvds_meta (inbuf, bbparams, free_ds_meta);
dsmeta->meta_type = NVDS_META_FRAME_INFO;
//my code below*
static gint coun=0;
gchar file[100];
cv::Mat save_in_mat,save_out_mat;
gpointer state = NULL;
GstMeta *gst_meta = NULL;
NvBufferParams buf_params;
GstMapInfo in_map_info;
int in_dmabuf_fd = 0;
gpointer mapped_ptr = NULL;
GstFlowReturn flow_ret = GST_FLOW_OK;
memset (&in_map_info, 0, sizeof (in_map_info));
if (!gst_buffer_map (inbuf, &in_map_info, GST_MAP_READ)) {
flow_ret = GST_FLOW_ERROR;
goto done;
}
if (ExtractFdFromNvBuffer (in_map_info.data, &in_dmabuf_fd)) {
flow_ret = GST_FLOW_ERROR;
goto done;
}
for (guint i = 0; i < batch_size; i++) {
if (NvBufferGetParams (in_dmabuf_fd, &buf_params) != 0) {
flow_ret = GST_FLOW_ERROR;
goto done;
}
//NvBufferGetParams (in_dmabuf_fd, &buf_params);
if (NvBufferMemMap(in_dmabuf_fd, 0, NvBufferMem_Read,&mapped_ptr) != 0) {
flow_ret = GST_FLOW_ERROR;
goto done;
}
coun=coun+1;
sprintf(file,"%u.jpg",coun);
//cv::imwrite(file, batchBlob);
//GstBuffer *buf = (GstBuffer *) inbuf->data;
GstMapInfo map;
//gst_buffer_map (inbuf, &map, GST_MAP_READ);
gint width=1280;
gint height=720;
save_in_mat=cv::Mat (width, height, CV_8UC4, mapped_ptr, buf_params.pitch[0]);//cv::Mat::AUTO_STEP
cv::cvtColor (save_in_mat, save_out_mat, CV_BGRA2BGR);
cv::imwrite(file, save_out_mat);
}
done:
if (mapped_ptr){
NvBufferMemUnMap (in_dmabuf_fd, 0, &mapped_ptr);
}
if (in_dmabuf_fd){
NvReleaseFd (in_dmabuf_fd);
}
gst_buffer_unmap (inbuf, &in_map_info);
std::cout << "debug save image " <<":done end!"<< std::endl;
//return flow_ret;