FxEngine Plugin to Stream Video Data from a Webcam

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Introduction

The purpose of this tip is to help to work on video stream using a simple plugin approach. Instead of using a full DShow architecture, I use the FxEngine Framework from SMProcess.

My approach was the following: create a video source plugin using DShow's components and process video stream with one or several processing plugins using C++.

Background

The plugin is based on the StillCap sample from DShow SDK (SDK\Samples\Multimedia\DirectShow\Editing\StillCap). There is an excellent article by Chesnokov Yuriy about this.

Using the Code

Firstly, I used the Framework to build the plugin (Out pin, plugin's parameter, Win32 dialog and plugin interface). I just read the sample code and the user's guide that comes with the Framework installation.

Secondly, I used DShow programming to get video data.

The video capture is done by:

• Creating an ISampleGrabber object to receive video data
• Retrieving the default video capture device using GetDefaultCapDevice() method
• Initializing video capture device using the InitVideoCapture() method

Using the Plugin

As shown in the screenshot above, I used the plugin in the Framework Editor to stream video data into several RGB splitters.