DDCOLORKEY structure (strmif.h)

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]

Describes a color key as a range of values.

Syntax

typedef struct DDCOLORKEY {
  DWORD dw1;
  DWORD dw2;
} DDCOLORKEY;

Members

dw1

Specifies the lower bound of the color key range.

dw2

Specifies the upper bound of the color key range.

Remarks

This structure is used by the Video Mixing Renderer (VMR) filter. The VMR uses this structure to support the DirectDraw capability of specifying a range of values for a color key by using two DWORDs. The VMR and the graphics card automatically determine whether the two DWORDs are interpreted as RGB or YUV color space values. Not all hardware may support this capability. To ensure compatibility with all hardware, set dw1 and dw2 to the same value.

Requirements