Calculators communicate by sending and receiving packets. Typically a single packet is sent along each input stream at each input timestamp. A packet can contain any kind of data, such as a single frame of video or a single integer detection count.
Creating a packet
Packets are generally created with mediapipe::MakePacket<T>()
or mediapipe::Adopt()
(from packet.h).
// Create a packet containing some new data.
Packet
p
=
MakePacket<MyDataClass>
(
"constructor_argument"
);
// Make a new packet with the same data and a different timestamp.
Packet
p2
=
p
.
At
(
Timestamp
::
PostStream
());
or:
// Create some new data.
auto
data
=
absl
::
make_unique<MyDataClass>
(
"constructor_argument"
);
// Create a packet to own the data.
Packet
p
=
Adopt
(
data
.
release
()).
At
(
Timestamp
::
PostStream
());
Data within a packet is accessed with Packet::Get<T>()
