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, timestamp):
logging.debug("generate_event_msg_meta: BEGIN")
meta = pyds.NvDsEventMsgMeta.cast(data)
meta.sensorId = 0
meta.placeId = 0
meta.moduleId = 0
meta.sensorStr = "sensor-0"
meta.ts = create_pyds_string(str(timestamp))
# 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)
elif 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)
logging.debug("generate_event_msg_meta: END")
return meta
def meta_copy_func(data, user_data):
logging.debug("meta_copy_func: BEGIN")
# Cast data to pyds.NvDsUserMeta
user_meta = pyds.NvDsUserMeta.cast(data)
src_meta_data = user_meta.user_meta_data
# Cast src_meta_data to pyds.NvDsEventMsgMeta
srcmeta = pyds.NvDsEventMsgMeta.cast(src_meta_data)
# Duplicate the memory contents of srcmeta to dstmeta
# First use pyds.get_ptr() to get the C address of srcmeta, then
# use pyds.memdup() to allocate dstmeta and copy srcmeta into it.
# pyds.memdup returns C address of the allocated duplicate.
dstmeta_ptr = pyds.memdup(pyds.get_ptr(srcmeta),
sys.getsizeof(pyds.NvDsEventMsgMeta))
# Cast the duplicated memory to pyds.NvDsEventMsgMeta
dstmeta = pyds.NvDsEventMsgMeta.cast(dstmeta_ptr)
# Duplicate contents of ts field. Note that reading srcmeta.ts
# returns its C address. This allows to memory operations to be
# performed on it.
dstmeta.ts = pyds.strdup(srcmeta.ts)
# Copy the sensorStr. This field is a string property.
# The getter (read) returns its C address. The setter (write)
# takes string as input, allocates a string buffer and copies
# the input string into it.
# pyds.get_string() takes C address of a string and returns
# the reference to a string object and the assignment inside the binder copies content.
dstmeta.sensorStr = pyds.get_string(srcmeta.sensorStr)
if srcmeta.objSignature.size > 0:
dstmeta.objSignature.signature = pyds.memdup(
srcmeta.objSignature.signature, srcMeta.objSignature.size)
dstmeta.objSignature.size = srcmeta.objSignature.size
if srcmeta.extMsgSize > 0:
if srcmeta.objType == pyds.NvDsObjectType.NVDS_OBJECT_TYPE_VEHICLE:
srcobj = pyds.NvDsVehicleObject.cast(srcmeta.extMsg)
obj = pyds.alloc_nvds_vehicle_object()
obj.type = pyds.get_string(srcobj.type)
obj.make = pyds.get_string(srcobj.make)
obj.model = pyds.get_string(srcobj.model)
obj.color = pyds.get_string(srcobj.color)
obj.license = pyds.get_string(srcobj.license)
obj.region = pyds.get_string(srcobj.region)
dstmeta.extMsg = obj
dstmeta.extMsgSize = sys.getsizeof(pyds.NvDsVehicleObject)
elif srcmeta.objType == pyds.NvDsObjectType.NVDS_OBJECT_TYPE_PERSON:
srcobj = pyds.NvDsPersonObject.cast(srcmeta.extMsg)
obj = pyds.alloc_nvds_person_object()
obj.age = srcobj.age
obj.gender = pyds.get_string(srcobj.gender)
obj.cap = pyds.get_string(srcobj.cap)
obj.hair = pyds.get_string(srcobj.hair)
obj.apparel = pyds.get_string(srcobj.apparel)
dstmeta.extMsg = obj
dstmeta.extMsgSize = sys.getsizeof(pyds.NvDsVehicleObject)
logging.debug("meta_copy_func: END")
return dstmeta
def generate_event_msg_meta(data, class_id, pravega_timestamp):
logging.info("generate_event_msg_meta: BEGIN")
meta = pyds.NvDsEventMsgMeta.cast(data)
meta.sensorId = 0
meta.placeId = 0
meta.moduleId = 0
meta.sensorStr = "sensor-0"
# We store the TAI timestamp in videoPath because there isn't a better place that is output by nvmsgconv.
meta.videoPath = str(pravega_timestamp.nanoseconds())
# Also store UTC timestamp as a string like "2021-01-02T22:57:10.490000+00:00".
meta.ts = create_pyds_string(pravega_timestamp.to_iso_8601())
# 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)
elif 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)
elif class_id == PGIE_CLASS_ID_NONE:
meta.type = pyds.NvDsEventType.NVDS_EVENT_EMPTY
meta.objType = pyds.NvDsObjectType.NVDS_OBJECT_TYPE_UNKNOWN
logging.debug("generate_event_msg_meta: END")
return meta