CBaseControlVideo.SetDefaultSourceRect method
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The SetDefaultSourceRect method sets the default source video rectangle (pure virtual). This in an internal member function that gets called when the source rectangle is reset.
Syntax
virtual HRESULT SetDefaultSourceRect() = 0;
Parameters
This method has no parameters.
Return value
Returns an HRESULT value.
Remarks
Derived classes should override this to reset the source rectangle. It is called from CBaseControlVideo::SetDefaultSourcePosition.
The following example demonstrates an implementation of this function in a derived class.
// This is called when you reset the default source rectangle.
HRESULT CVideoText::SetDefaultSourceRect()
{
VIDEOINFO *pVideoInfo = (VIDEOINFO *) m_pRenderer->m_mtIn.Format();
BITMAPINFOHEADER *pHeader = HEADER(pVideoInfo);
RECT SourceRect = {0,0,pHeader->biWidth,pHeader->biHeight};
m_pRenderer->m_DrawImage.SetSourceRect(&SourceRect);
return NOERROR;
}
In this example, CVideoText is a class derived from CBaseControlVideo, m_pRenderer holds an object of a class derived from CBaseVideoRenderer, and the m_DrawImage data member, defined in the derived class, holds a CDrawImage object. The m_mtIn data member, also defined in the derived class, holds a CMediaType object with media type of the input pin.
Requirements
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