New Features for nvivafilter

Autonomous Machines Jetson & Embedded Systems Jetson Nano
8

Hi,
It might not be easy for us to put custom properties in nvivafilter. Is it possible to use global variables in your usecase?

For example, please put the variable in nvsample_cudaprocess.cu

int property_test = 0;

add print in gpu_process():

printf("property = %d \n", property_test);

and you can set it in gstreamer app:

#include <cstdlib>
#include <cstring>
#include <sstream>
#include <gst/gst.h>

using namespace std;

#define USE(x) ((void)(x))

static GstPipeline *gst_pipeline = nullptr;
static string launch_string;

GstClockTime usec = 1000000;
static int w = 1920;
static int h = 1080;

<b>extern int property_test;</b>

int main(int argc, char** argv) {
    USE(argc);
    USE(argv);

    gst_init (&argc, &argv);

    GMainLoop *main_loop;
    main_loop = g_main_loop_new (NULL, FALSE);
    ostringstream launch_stream;

    launch_stream
    << "videotestsrc name=mysource ! "
    << "video/x-raw,width="<< w <<",height="<< h <<",framerate=30/1,format=NV12 ! "
    << "nvvidconv ! video/x-raw(memory:NVMM),format=NV12 ! "
    << "nvivafilter cuda-process=true customer-lib-name=libnvsample_cudaprocess.so ! "
    << "video/x-raw(memory:NVMM), format=(string)RGBA ! "
    << "nvoverlaysink ";

    launch_string = launch_stream.str();

    g_print("Using launch string: %s\n", launch_string.c_str());

    GError *error = nullptr;
    gst_pipeline  = (GstPipeline*) gst_parse_launch(launch_string.c_str(), &error);

    if (gst_pipeline == nullptr) {
        g_print( "Failed to parse launch: %s\n", error->message);
        return -1;
    }
    if(error) g_error_free(error);

    gst_element_set_state((GstElement*)gst_pipeline, GST_STATE_PLAYING); 

    g_usleep(10*usec);
    <b>property_test=10;</b>
    g_usleep(10*usec);

    GstElement* src = gst_bin_get_by_name(GST_BIN(gst_pipeline), "mysource");
    gst_element_send_event (src, gst_event_new_eos ());
    // Wait for EOS message
    GstBus *bus = gst_pipeline_get_bus(GST_PIPELINE(gst_pipeline));
    gst_bus_poll(bus, GST_MESSAGE_EOS, GST_CLOCK_TIME_NONE);

    gst_element_set_state((GstElement*)gst_pipeline, GST_STATE_NULL);
    gst_object_unref(GST_OBJECT(gst_pipeline));
    g_main_loop_unref(main_loop);

    g_print("going to exit \n");
    return 0;
}

Build command:

$ g++ -Wall -std=c++11  test.cpp -o test $(pkg-config --cflags --libs gstreamer-app-1.0) -L/usr/lib/aarch64-linux-gnu/ -lnvsample_cudaprocess

In this demo, you should be able to set properties in app and get update value in gpu_process().