def generate_event_msg_meta(data, class_id):
meta = pyds.glist_get_nvds_event_msg_meta(data)
meta.sensorId = 0
meta.placeId = 0
meta.moduleId = 0
meta.sensorStr = "sensor-0"
meta.ts = pyds.alloc_buffer(MAX_TIME_STAMP_LEN + 1)
pyds.generate_ts_rfc3339(meta.ts, MAX_TIME_STAMP_LEN)
# This demonstrates how to attach custom objects.
# Any custom object as per requirement can be generated and attached
# like NvDsVehicleObject / NvDsPersonObject. Then that object should
# be handled in payload generator library (nvmsgconv.cpp) accordingly.
if (class_id == PGIE_CLASS_ID_VEHICLE):
meta.type = pyds.NvDsEventType.NVDS_EVENT_MOVING
meta.objType = pyds.NvDsObjectType.NVDS_OBJECT_TYPE_VEHICLE
meta.objClassId = PGIE_CLASS_ID_VEHICLE
obj = pyds.alloc_nvds_vehicle_object()
obj = generate_vehicle_meta(obj)
meta.extMsg = obj
meta.extMsgSize = sys.getsizeof(pyds.NvDsVehicleObject)
if (class_id == PGIE_CLASS_ID_PERSON):
meta.type = pyds.NvDsEventType.NVDS_EVENT_ENTRY
meta.objType = pyds.NvDsObjectType.NVDS_OBJECT_TYPE_PERSON
meta.objClassId = PGIE_CLASS_ID_PERSON
obj = pyds.alloc_nvds_person_object()
obj = generate_person_meta(obj)
meta.extMsg = obj
meta.extMsgSize = sys.getsizeof(pyds.NvDsPersonObject)
return meta
def generate_event_msg_meta(data, class_id):
'''
Some MetaData instances are stored in GList form.
To access the data in a GList node,
the data field needs to be cast to the appropriate structure.
This casting is done via cast() member function for the target type:
'''
meta = pyds.NvDsEventMsgMeta.cast(data)
# Check the following link for struct fields
# https://docs.nvidia.com/metropolis/deepstream/5.0/dev-guide/DeepStream_Development_Guide/baggage/structNvDsEventMsgMeta.html#af94e900971860386108ddcdf82983490
meta.ts = pyds.alloc_buffer(MAX_TIME_STAMP_LEN + 1)
pyds.generate_ts_rfc3339(meta.ts, MAX_TIME_STAMP_LEN)
'''
if (class_id == PGIE_CLASS_ID_PERSON):
meta.type = pyds.NvDsEventType.NVDS_EVENT_ENTRY
meta.objType = pyds.NvDsObjectType.NVDS_OBJECT_TYPE_PERSON # This affects the meta fields
meta.objClassId = PGIE_CLASS_ID_PERSON
# We need to allocate memory in order to persist the object
# See the following link:
# https://docs.nvidia.com/metropolis/deepstream/dev-guide/index.html#page/DeepStream_Development_Guide/deepstream_Python_sample_apps.html#wwpID0E0WC0HA
# obj = pyds.alloc_nvds_person_object()
# obj = generate_person_meta(obj)
# meta.extMsg = obj
# meta.extMsgSize = sys.getsizeof(pyds.NvDsPersonObject)
'''
meta.type = pyds.NvDsEventType.NVDS_EVENT_ENTRY
meta.objType = pyds.NvDsObjectType.NVDS_OBJECT_TYPE_CUSTOM
# TODO we need to allocate memory and generate custom metadata
# See above for how to do it
meta.objClassId = class_id
return meta