---
layout: default
title: Packets
parent: Framework Concepts
nav_order: 3
---

# Packets
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1. TOC
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---

Each calculator is a node of of a graph. We describe how to create a new calculator, how to initialize a calculator, how to perform its calculations, input and output streams, timestamps, and options

## Creating a packet

Packets are generally created with `MediaPipe::Adopt()` (from packet.h).

```c++
// Create some data.
auto data = gtl::MakeUnique<MyDataClass>("constructor_argument");
// Create a packet to own the data.
Packet p = Adopt(data.release());
// Make a new packet with the same data and a different timestamp.
Packet p2 = p.At(Timestamp::PostStream());
```

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