Preview of Closed Captions

Both MPlatform and MFormats SDKs have an MCCDisplay object to overlay a video preview with Closed Captions data.

The result looks like:

MPlatform SDK

You should create an instance of the MCCDisplay object and add it as a plugin to your source:

MCCDisplayLib.MCCDisplayClass m_CCDisplay = new MCCDisplayLib.MCCDisplayClass();
m_objPlaylist.PluginsAdd(m_CCDisplay, 0);

MFormats SDK

You should create an instance of the MCCDiaplay object and process frames with this object before sending them to an output object, e.g. MFPreview:

// create an instance of the object
MCCDisplay m_CCDisplay = new MCCDisplay();
// .. grab a frame in your main thread
MFFrame sourceFrame;
mySource.SourceFrameGet(-1, out myFrame, "");
// process the frame with the MCCDisplay object
int framesRest;
MFFrame modifiedFrame;
((IMFProcess)m_CCDisplay).ProcessFrame(sourceFrame, out modifiedFrame, out framesRest, "");
// send the modified frame to a preview
((IMFReceiver)myPreview).ReceiverFramePut(modifiedFrame, -1, "");

MCCDisplay object properties

You can specify a style of the overlay using the object properties.

The properties are stored in the system registry:

[HKEY_CURRENT_USER\SOFTWARE\Medialooks\MCCDisplay]

Or can be set with the PropsSet method:

(m_CCDisplay as IMProps).PropsSet("face", "Arial");

Here is a list of properties: