GMFBridge在DirectShow中的用法 | GMFBridge在DirectShow中的用法

本文介绍了GMFBridge在DirectShow中的用法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

在此处输入代码我必须停止并动态启动视频渲染器过滤器。如果不创建新图形，则使用常规 Direct Show Architecture是不可能的。

但是我不知道如何使用它。（是的，我在）

我的图表是：

  SourceFilter ---> MyCustomTransformFilter --->视频Rendrer过滤器

那么GMFBridge适合放在哪里？

  i）我可以将图表分为两块
 [Source Filter + MyCustomFilter] + Video Rendere 
 
 
 ii）然后，如何使用GMFBridge将过滤器添加到图形中，并停止启动Video Rendrere，而没有
影响我的其余图形？

更新：

感谢Wimmel

我只是感到困惑...让我清楚我的理解

i）我在首先

 （SingleGraph）SourceFilter ---> MyCustomTransformFilter --->视频Rendrer过滤器

ii）为了使用GMFBridge，我将我的单个图分成两个单独的图图

 第一张图：SourceFilter ---> MyCustomTransformFilter-> GMFBridgeSinkFilter 
第二个图表：GMFBridgeSourceFilter --->视频渲染器过滤器

嗯，GMFBridgeSinkFilter和GMFBridgeSourceFilter吗？这些是什么？

iii）然后我创建一个IGMFBridgeControllerPtr实例并进行必要的初始化...

  IGMFBridgeControllerPtr bridgeController = ...... 
 
 ..... 
 bridgeController-> AddStream（true，eUncompressed，true）; 
 bridgeController-> AddStream（false，eUncompressed，true）;

iv）桥控制器将宿过滤器添加到源图中并连接它：

  bridgeController-> InsertSinkFilter（sourceGraph，sourceGraphSinkFilter）;

什么是sourceGraph，sourceGraphSinkFilter？

  //现在像这样连接它：
 // SourceFilter ---> MyCustomTransformFilter ---> SourceGraphSinkFilter

您是说以编程方式将这些过滤器连接到源图中？

iv）在第二张图中，让控制器添加源过滤器，并将其连接到渲染器：

  bridgeController-> InsertSourceFilter（sinkFilter，renderGraph，renderGraphSourceFilter）;

再说一下接收器，renderGraphSourceFilter等是什么？

  //现在像这样连接它：
 // RenderGraphSourceFilter --->视频渲染器过滤器

而您是说要在源图中以编程方式连接这些过滤器？

解决方案

您可能要创建以下两个图形：

  1：SourceFilter ---> MyCustomTransformFilter ---> GMFBridgeSinkFilter 
 
 2：GMFBridgeSourceFilter --->视频渲染器过滤器

基本上，您可以执行以下操作：

创建并配置GMFBridgeController，例如一个视频和一个音频流：

  IGMFBridgeControllerPtr m_pController; 
 HRESULT hr = m_pController.CreateInstance（__ uuidof（GMFBridgeController））; 
 m_pController-> AddStream（true，eUncompressed，true）; 
 m_pController-> AddStream（false，eUncompressed，true）;

现在，让控制器向源图添加一个接收器过滤器并将其连接：

  hr = m_pController-> InsertSinkFilter（m_pSourceGraph，& m_pSourceGraphSinkFilter）; 
 //现在像这样连接它：
 // SourceFilter ---> MyCustomTransformFilter ---> SourceGraphSinkFilter

在第二张图中，让控制器添加源过滤器，并将其连接到渲染器：

  hr = m_pController-> InsertSourceFilter（m_pSourceGraphSinkFilter，m_pRenderGraph，& m_pRenderGraphSourceFilter）; 
 //现在像这样连接它：
 // RenderGraphSourceFilter --->视频渲染器过滤器

启动两个图形并连接它们：

  hr = m_pController-> BridgeGraphs（m_pSourceGraphSinkFilter，m_pRenderGraphSourceFilter）;

如果要停止一个图形，请先断开连接：

  m_pController-> BridgeGraphs（NULL，NULL）;

编辑

以下是您要求的一些澄清：

GMFBridgeSinkFilter和GMFBridgeSourceFilter是GMFBridge创建的过滤器。我不知道它们的确切类型，但至少它们是从IBaseFilter派生的。

m_pSourceGraph和m_pRenderGraph是您创建的两个图形的IGraphBuilder接口。

m_pSourceGraphSinkFilter和m_pRenderGraphSourceFilter是指向IBaseFilter的指针，以接收指向GMFBridge创建的过滤器的指针。

是的，当我说连接过滤器，是指以编程方式连接它们。据我所知，您无法在graphedit中测试GMFBridge。

enter code hereI have to stop and start Video Renderer Filter dynamically . That is not possible with "normal" Direct Show Architecture without creating new graph. But with GMFBridge it seems it is possible.

But i can not figure out how to use it.( yes i read the paper at http://www.gdcl.co.uk/gmfbridge/index.htm )

My Graph is:

SourceFilter ---> MyCustomTransformFilter ---> Video Rendrer Filter

So GMFBridge fits where?

i) I can devide my graph two pieces
       [ Source Filter + MyCustomFilter ] + Video Rendere


ii) Then how to add my filters to graph, and stop start Video Rendrere without
affecting the rest of my grapg using GMFBridge?

Update:

Thanks Wimmel

I just confused... Let me clear what i understand

i) I have single graph at first

 (SingleGraph) SourceFilter ---> MyCustomTransformFilter ---> Video Rendrer Filter

ii) In order to use GMFBridge i divede my single graph into two separate graph

 First Graph  :  SourceFilter ---> MyCustomTransformFilter --> GMFBridgeSinkFilter
 Second Graph :  GMFBridgeSourceFilter ---> Video Renderer Filter

Well, GMFBridgeSinkFilter and GMFBridgeSourceFilter ? what are they? their class type?

iii) Then i create an intance of IGMFBridgeControllerPtr and make necessary init...

IGMFBridgeControllerPtr bridgeController = ......

.....
bridgeController->AddStream(true, eUncompressed, true);
bridgeController->AddStream(false, eUncompressed, true);

iv) Bridge Controller add a sink filter to the source graph and connect it:

 bridgeController->InsertSinkFilter(sourceGraph, sourceGraphSinkFilter);

What are sourceGraph, sourceGraphSinkFilter s ?

// now connect it like this:
// SourceFilter ---> MyCustomTransformFilter ---> SourceGraphSinkFilter

You mean programtically connect those filters in the source graph?

iv) In the second graph let the controller add a source filter, and connect it to the renderer:

bridgeController->InsertSourceFilter(sinkFilter, renderGraph, renderGraphSourceFilter);

Again what are sinkFilter,renderGraphSourceFilter etc?

 // now connect it like this:
 // RenderGraphSourceFilter ---> Video Renderer Filter

And You mean programtically connect those filters in the source graph?

解决方案

You probably want to create the following two graphs:

1: SourceFilter ---> MyCustomTransformFilter ---> GMFBridgeSinkFilter

2: GMFBridgeSourceFilter ---> Video Renderer Filter

Basically you do the following:

Create a GMFBridgeController and configure it, for example one video and one audio stream:

IGMFBridgeControllerPtr  m_pController;
HRESULT hr = m_pController.CreateInstance(__uuidof(GMFBridgeController));
m_pController->AddStream(true, eUncompressed, true);
m_pController->AddStream(false, eUncompressed, true);

Now let the controller add a sink filter to the source graph and connect it:

hr = m_pController->InsertSinkFilter(m_pSourceGraph, &m_pSourceGraphSinkFilter);
// now connect it like this:
// SourceFilter ---> MyCustomTransformFilter ---> SourceGraphSinkFilter

In your second graph let the controller add a source filter, and connect it to the renderer:

hr = m_pController->InsertSourceFilter(m_pSourceGraphSinkFilter, m_pRenderGraph, &m_pRenderGraphSourceFilter);
// now connect it like this:
// RenderGraphSourceFilter ---> Video Renderer Filter

Start both graphs and connect them:

hr = m_pController->BridgeGraphs(m_pSourceGraphSinkFilter, m_pRenderGraphSourceFilter);

If you want to stop one graph, first disconnect:

m_pController->BridgeGraphs(NULL, NULL);

edit

Here are some clarifications you asked for:

GMFBridgeSinkFilter and GMFBridgeSourceFilter are the filters created by GMFBridge. I don't know their exact types, but at least they derive from IBaseFilter.

m_pSourceGraph and m_pRenderGraph are the IGraphBuilder interfaces of both graphs you have created.

m_pSourceGraphSinkFilter and m_pRenderGraphSourceFilter are pointers to IBaseFilter to receive the pointer to the filter created by GMFBridge.

And yes, when I say connect filters, I mean programtically connect them. As far as I know you cannot test GMFBridge in graphedit.

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