pylonsrc: added gst parameter inter-packet-delay for tuning when using multiple cameras and limited bandwidth situations

sys/pylon/gstpylonsrc.c

@@ -173,6 +173,7 @@ typedef enum _GST_PYLONSRC_PROP
   PROP_FRAMEDROPLIMIT,
   PROP_GRABTIMEOUT,
   PROP_PACKETSIZE,
+  PROP_INTERPACKETDELAY,
 
   PROP_CONFIGFILE,
   PROP_IGNOREDEFAULTS,
@@ -355,7 +356,7 @@ ascii_strdown (gchar * *str, gssize len)
 #define DEFAULT_PROP_FRAMEDROPLIMIT                   10
 #define DEFAULT_PROP_GRABTIMEOUT                      1000
 #define DEFAULT_PROP_PACKETSIZE                       1500
-
+#define DEFAULT_PROP_INTERPACKETDELAY                 0
 /* pad templates */
 static GstStaticPadTemplate gst_pylonsrc_src_template =
 GST_STATIC_PAD_TEMPLATE ("src",
@@ -745,6 +746,12 @@ gst_pylonsrc_class_init (GstPylonSrcClass * klass)
           "The packetsize parameter specifies the maximum size of a data packet transmitted via Ethernet. The value is in bytes.",
           0, 16000, DEFAULT_PROP_PACKETSIZE,
           (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
+  g_object_class_install_property (gobject_class, PROP_INTERPACKETDELAY,
+      g_param_spec_int ("inter-packet-delay",
+          "Inter-Packet Delay between packet transmissions",
+          "If your network hardware can't handle the incoming packet rate, it is useful to increase the delay between packet transmissions.",
+          0, 3435, DEFAULT_PROP_INTERPACKETDELAY,
+          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
 }
 
 static gboolean
@@ -836,6 +843,7 @@ gst_pylonsrc_init (GstPylonSrc * src)
   src->frameDropLimit = DEFAULT_PROP_FRAMEDROPLIMIT;
   src->grabtimeout = DEFAULT_PROP_GRABTIMEOUT;
   src->packetSize = DEFAULT_PROP_PACKETSIZE;
+  src->interPacketDelay = DEFAULT_PROP_INTERPACKETDELAY;
 
   for (int i = 0; i < PROP_NUM_PROPERTIES; i++) {
     src->propFlags[i] = GST_PYLONSRC_PROPST_DEFAULT;
@@ -1163,6 +1171,9 @@ gst_pylonsrc_set_property (GObject * object, guint property_id,
     case PROP_PACKETSIZE:
       src->packetSize = g_value_get_int (value);
       break;
+    case PROP_INTERPACKETDELAY:
+      src->interPacketDelay = g_value_get_int (value);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
       return;
@@ -1383,6 +1394,9 @@ gst_pylonsrc_get_property (GObject * object, guint property_id,
     case PROP_PACKETSIZE:
       g_value_set_int (value, src->packetSize);
       break;
+    case PROP_INTERPACKETDELAY:
+      g_value_set_int (value, src->interPacketDelay);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
       break;
@@ -2888,6 +2902,30 @@ error:
   return FALSE;
 }
 
+static gboolean
+gst_pylonsrc_set_interPacketDelay (GstPylonSrc * src)
+{
+  GENAPIC_RESULT res;
+
+  if (is_prop_implicit (src, PROP_INTERPACKETDELAY)) {
+    if (is_prop_set (src, PROP_INTERPACKETDELAY)) {
+      if (feature_supported (src, "GevSCPD")) {
+        GST_DEBUG_OBJECT (src, "Setting inter packet delay to %d",
+            src->interPacketDelay);
+        res =
+            PylonDeviceSetIntegerFeature (src->deviceHandle, "GevSCPD",
+            src->interPacketDelay);
+        PYLONC_CHECK_ERROR (src, res);
+      }
+    }
+    reset_prop (src, PROP_INTERPACKETDELAY);
+  }
+  return TRUE;
+
+error:
+  return FALSE;
+}
+
 static gboolean
 gst_pylonsrc_configure_start_acquisition (GstPylonSrc * src)
 {
@@ -3716,6 +3754,7 @@ read_all_features (GstPylonSrc * src)
   gst_pylonsrc_read_pixel_format (src);
   gst_pylonsrc_read_test_image (src);
   //gst_pylonsrc_read_packetsize(src);
+  //gst_pylonsrc_read_interPacketDelay(src)
   gst_pylonsrc_read_readout (src);
   gst_pylonsrc_read_bandwidth (src);
   gst_pylonsrc_read_framerate (src);
@@ -3773,6 +3812,7 @@ gst_pylonsrc_set_properties (GstPylonSrc * src)
       gst_pylonsrc_set_pixel_format (src) &&
       gst_pylonsrc_set_test_image (src) &&
       gst_pylonsrc_set_packetsize (src) &&
+      gst_pylonsrc_set_interPacketDelay (src) &&
       gst_pylonsrc_set_readout (src) &&
       gst_pylonsrc_set_bandwidth (src) &&
       gst_pylonsrc_set_framerate (src) &&
@@ -4056,8 +4096,8 @@ pylonc_print_camera_info (GstPylonSrc * src, PYLON_DEVICE_HANDLE deviceHandle,
         serial[1] = '\0';
       }
     }
-
     if (PylonDeviceFeatureIsReadable (deviceHandle, "DeviceUserID")) {
+
       siz = sizeof (id);
       res = PylonDeviceFeatureToString (deviceHandle, "DeviceUserID", id, &siz);
       PYLONC_CHECK_ERROR (src, res);

sys/pylon/gstpylonsrc.h

@@ -39,7 +39,7 @@ enum
   GST_PYLONSRC_NUM_CAPTURE_BUFFERS = 10,
   GST_PYLONSRC_NUM_AUTO_FEATURES = 3,
   GST_PYLONSRC_NUM_LIMITED_FEATURES = 2,
-  GST_PYLONSRC_NUM_PROPS = 70
+  GST_PYLONSRC_NUM_PROPS = 71
 };
 
 typedef enum _GST_PYLONSRC_PROPERTY_STATE
@@ -100,7 +100,8 @@ struct _GstPylonSrc
 
   GstPylonSrcLimitedFeature limitedFeature[GST_PYLONSRC_NUM_LIMITED_FEATURES];
 
-  gint maxBandwidth, testImage, frameDropLimit, grabtimeout, packetSize;
+  gint maxBandwidth, testImage, frameDropLimit, grabtimeout, packetSize,
+      interPacketDelay;
   gint size[2];
   gint binning[2];
   gint maxSize[2];