Packets

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.
Packetp=MakePacket<MyDataClass>("constructor_argument");
// Make a new packet with the same data and a different timestamp.
Packetp2=p.At(Timestamp::PostStream());

or:

// Create some new data.
autodata=absl::make_unique<MyDataClass>("constructor_argument");
// Create a packet to own the data.
Packetp=Adopt(data.release()).At(Timestamp::PostStream());

Data within a packet is accessed with Packet::Get<T>()