MFOverlayRect Method (MFFrameClass)

Mixes frames - overlays _pFrameOverlay frame over this frame, the position is from top-left corner, for 4:2:2 images (e.g. UYVY) horizontal position is aligned by two (e.g. 21->20). By default audio gain is calculated based on overlay size and transparency or can be specified via 'audio_gain' props.

Syntax

VB.Net
C#
Delphi
C++

Public Overridable Sub MFOverlayRect( _
   ByVal _pFrameOverlay As MFFrame, _
   ByVal _pFrameMask As MFFrame, _
   ByRef _pRect As MF_RECT, _
   ByVal _eMFOverlayFlags As eMFOverlayFlags, _
   ByVal _dblAlpha As Double, _
   ByVal _bsPropsList As String, _
   ByVal _bsAudioBufferID As String _
)

public virtual void MFOverlayRect( 
   MFFrame _pFrameOverlay,
   MFFrame _pFrameMask,
   ref MF_RECT _pRect,
   eMFOverlayFlags _eMFOverlayFlags,
   double _dblAlpha,
   string _bsPropsList,
   string _bsAudioBufferID
)

public procedure MFOverlayRect( 
    _pFrameOverlay: MFFrame;
    _pFrameMask: MFFrame;
   var  _pRect: MF_RECT;
    _eMFOverlayFlags: eMFOverlayFlags;
    _dblAlpha: Double;
    _bsPropsList: String;
    _bsAudioBufferID: String
); virtual;

public: virtual void MFOverlayRect( 
   MFFrame* _pFrameOverlay,
   MFFrame* _pFrameMask,
   ref MF_RECT _pRect,
   eMFOverlayFlags _eMFOverlayFlags,
   double _dblAlpha,
   BSTR* _bsPropsList,
   BSTR* _bsAudioBufferID
)

Parameters

_pFrameOverlay: frame for overlay
_pFrameMask: frame mask
_pRect: rectangle for overlay
_eMFOverlayFlags: overlay flags
_dblAlpha: transparency: 0.0 - transparent (no mix), 1.0 - solid.
_bsPropsList: additional properties (for example, audio_gain)
_bsAudioBufferID: audio buffer's ID

Reference

MFFrameClass Class
MFFrameClass Members