Can't add a new property to [ds-example]

[edit_or]

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU) dGPU
• DeepStream Version 6.3
• JetPack Version (valid for Jetson only) 5.1.2
• TensorRT Version 8.5.3
I am adding a new property num-sources to gst-dsexample.

[ds-example]
enable=1
processing-width=1024
processing-height=1024
full-frame=1
blur-objects=0
unique-id=15
num-sources=6

(1)Added a new element to the struct in gstdsexample.h

struct _GstDsExample
{
    
  //number of sources
  gint num_sources;
};

(2)Added a new element to enum in gstdsexample.cpp

enum
{
  PROP_0,
  PROP_UNIQUE_ID,
  PROP_PROCESSING_WIDTH,
  PROP_PROCESSING_HEIGHT,
  PROP_PROCESS_FULL_FRAME,
  PROP_BLUR_OBJECTS,
  PROP_GPU_DEVICE_ID,
  PROP_NUM_SOURCES
};

(3)Default value is defined
#define DEFAULT_NUM_SOURCES 6

(4)Inside gst_dsexample_class_init

static void
gst_dsexample_class_init (GstDsExampleClass * klass)
{
   g_object_class_install_property (gobject_class, PROP_NUM_SOURCES,
      g_param_spec_int ("num-sources",
          "Num Sources",
          "Number of Sources",
          1, G_MAXINT, DEFAULT_NUM_SOURCES, (GParamFlags)
          (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
}

(5)Default value is set

static void
gst_dsexample_init (GstDsExample * dsexample)
{
   dsexample->num_sources = DEFAULT_NUM_SOURCES;
}

(6)Set and get new property inside the following functions.

static void
gst_dsexample_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstDsExample *dsexample = GST_DSEXAMPLE (object);
  
  switch (prop_id) {
    case PROP_UNIQUE_ID:
      dsexample->unique_id = g_value_get_uint (value);
      break;
    case PROP_PROCESSING_WIDTH:
      dsexample->processing_width = g_value_get_int (value);
      break;
    case PROP_PROCESSING_HEIGHT:
      dsexample->processing_height = g_value_get_int (value);
      break;
    case PROP_PROCESS_FULL_FRAME:
      dsexample->process_full_frame = g_value_get_boolean (value);
      break;
    case PROP_BLUR_OBJECTS:
      dsexample->blur_objects = g_value_get_boolean (value);
      break;
    case PROP_GPU_DEVICE_ID:
      dsexample->gpu_id = g_value_get_uint (value);
      break;
    case PROP_NUM_SOURCES:
      g_print("set_property prop_id %d \n",(int)prop_id);
      dsexample->num_sources = g_value_get_int (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

/* Function called when a property of the element is requested. Standard
 * boilerplate.
 */
static void
gst_dsexample_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstDsExample *dsexample = GST_DSEXAMPLE (object);

  switch (prop_id) {
    case PROP_UNIQUE_ID:
      g_value_set_uint (value, dsexample->unique_id);
      break;
    case PROP_PROCESSING_WIDTH:
      g_value_set_int (value, dsexample->processing_width);
      break;
    case PROP_PROCESSING_HEIGHT:
      g_value_set_int (value, dsexample->processing_height);
      break;
    case PROP_PROCESS_FULL_FRAME:
      g_value_set_boolean (value, dsexample->process_full_frame);
      break;
    case PROP_BLUR_OBJECTS:
      g_value_set_boolean (value, dsexample->blur_objects);
      break;
    case PROP_GPU_DEVICE_ID:
      g_value_set_uint (value, dsexample->gpu_id);
      break;
    case PROP_NUM_SOURCES:
      g_print("get_property prop_id %d \n",(int)prop_id);
      g_value_set_int (value, dsexample->num_sources);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

The issues are
(1) I have this warning when I run the app
** WARN: <parse_dsexample:907>: Unknown key 'num-sources' for group [ds-example]

(2) Then case PROP_NUM_SOURCES: is never called inside gst_dsexample_set_property and gst_dsexample_get_property

[Fiona.Chen]

This is GStreamer programming related. Please refer to Adding Properties (gstreamer.freedesktop.org), or you can raise this in the GStreamer community.

[edit_or]

Alright!