背景

MediaPipe的介绍。
源代码位置 https://github.com/google/mediapipe

框架介绍（截至2022-01）

主要是graph

官方介绍说明
https://google.github.io/mediapipe/framework_concepts/framework_concepts.html#the-basics

从hello-world开始

hello-world.cc位于https://github.com/google/mediapipe/blob/master/mediapipe/examples/desktop/hello_world/hello_world.cc

这个hello-world文件，包含了所有框架运行，需要的组件。

graph是怎么运行起来的？

准备config文件
根据config文件，初始化graph
graph初始化，调用Initialize
创建输出读取 OutputStreamPoller
graph开始运行
给graph添加输入
流程结束，进入关闭状态
读取输出
等待graph结束

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.edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-dUa6sqB0sQ1Z3cQh .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-dUa6sqB0sQ1Z3cQh .marker{fill:#333}#mermaid-svg-dUa6sqB0sQ1Z3cQh .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-dUa6sqB0sQ1Z3cQh {color: rgba(0, 0, 0, 0.75);font: ;}

main
CalculatorGraph graph
graph.Initialize(config)
OutputStreamPoller poller = graph.AddOutputStreamPoller('out')
graph.StartRun({})
graph.AddPacketToInputStream
graph.CloseInputStream('in')
poller.Next(&packet)
graph.WaitUntilDone()
CalculatorGraph::Initialize
validated_graph->Initialize()
Initialize
CalculatorGraph::InitializeExecutors
CalculatorGraph::InitializePacketGeneratorGraph
CalculatorGraph::InitializeStreams
CalculatorGraph::InitializeCalculatorNodes
CalculatorGraph::AddOutputStreamPoller
CalculatorGraph::StartRun
CalculatorGraph::PrepareForRun
Scheduler::Start
CalculatorGraph::AddPacketToInputStreamInternal
CalculatorGraph::CloseInputStream
OutputStreamPoller::Next
CalculatorGraph::WaitUntilDone

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