43 lines
1.1 KiB
Markdown
43 lines
1.1 KiB
Markdown
---
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layout: forward
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target: https://developers.google.com/mediapipe/framework/framework_concepts/packets
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title: Packets
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parent: Framework Concepts
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nav_order: 3
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---
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# Packets
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{: .no_toc }
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1. TOC
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{:toc}
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---
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Calculators communicate by sending and receiving packets. Typically a single
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packet is sent along each input stream at each input timestamp. A packet can
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contain any kind of data, such as a single frame of video or a single integer
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detection count.
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## Creating a packet
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Packets are generally created with `mediapipe::MakePacket<T>()` or
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`mediapipe::Adopt()` (from packet.h).
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```c++
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// Create a packet containing some new data.
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Packet p = MakePacket<MyDataClass>("constructor_argument");
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// Make a new packet with the same data and a different timestamp.
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Packet p2 = p.At(Timestamp::PostStream());
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```
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or:
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```c++
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// Create some new data.
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auto data = absl::make_unique<MyDataClass>("constructor_argument");
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// Create a packet to own the data.
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Packet p = Adopt(data.release()).At(Timestamp::PostStream());
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```
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Data within a packet is accessed with `Packet::Get<T>()`
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